1
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Li T, Ren D, Sun H, Wang H, Tian T, Li Q, Yan Z. Imbibition Characteristics and Influencing Factors of the Fracturing Fluid in a Tight Sandstone Reservoir. ACS Omega 2024; 9:17204-17216. [PMID: 38645319 PMCID: PMC11025072 DOI: 10.1021/acsomega.3c10081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Revised: 03/11/2024] [Accepted: 03/12/2024] [Indexed: 04/23/2024]
Abstract
The strong reservoir heterogeneity and complex microscopic pore structure in the Linxing area make it prone to water block damage during imbibition development. In order to explore the influence of reservoir microscopic characteristics on imbibition efficiency, taking the tight sandstone gas reservoir in the Linxing area of Ordos Basin as an example, the heterogeneity of the tight sandstone reservoir in the study area is characterized in terms of physical and chemical characteristics as well as the microscopic pore structure. Using nuclear magnetic resonance, high-pressure mercury pressure, and other testing methods, spontaneous seepage experiments in real sandstone were carried out to study the distribution law of different pore structures and seepage characteristics at different times and to systematically evaluate the microscopic pore characteristics of dense sandstone reservoirs and the factors affecting seepage and suction. The results show that due to the strong microscopic heterogeneity of tight sandstone, the macroscopic properties cannot directly reflect the microscopic characteristics, and the response to imbibition efficiency is stronger. The pore size is the main controlling factor affecting imbibition, and the contribution rate of the micropore and mesopore mainstream pore size spaces is higher than that of the macropore. Micropores provide imbibition power, and mesopores provide an imbibition interval. High-porosity and high permeability reservoirs are more conducive to imbibition replacement. The intercrystalline pores have a great influence on the imbibition efficiency, and the influence of intergranular pores and dissolution pores on the imbibition cannot be underestimated. The smaller the relative sorting coefficient, interfacial tension, and contact angle, the better the imbibition effect of fracturing fluid. Research results have theoretical guiding significance for spontaneous imbibition to improve oil recovery.
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Affiliation(s)
- Tian Li
- Engineering
Research Center of Development and Management for Low to Ultra-Low
Permeability Oil & Gas Reservoirs in West China, Ministry of Education,
College of Petroleum Engineering, Xi’an
Shiyou University, Xi’an 710065, China
| | - Dazhong Ren
- Engineering
Research Center of Development and Management for Low to Ultra-Low
Permeability Oil & Gas Reservoirs in West China, Ministry of Education,
College of Petroleum Engineering, Xi’an
Shiyou University, Xi’an 710065, China
| | - Haipeng Sun
- No.
4 Gas Production Plant, Chang Qing Oilfield Company, Petrochina Xi’an Shaanxi, Xi’an 710021, China
| | - Hu Wang
- No.
6 Gas Production Plant, Changqing Oilfield Company, PetroChina, Yan’an 716000, China
| | - Tao Tian
- Geology
Group CO., Ltd. Key Laboratory of Coal Resources Exploration and Comprehensive
Utilization, Ministry of Natural Resources, Xi’an 710021, China
| | - Qihui Li
- Engineering
Research Center of Development and Management for Low to Ultra-Low
Permeability Oil & Gas Reservoirs in West China, Ministry of Education,
College of Petroleum Engineering, Xi’an
Shiyou University, Xi’an 710065, China
| | - Zhen Yan
- Engineering
Research Center of Development and Management for Low to Ultra-Low
Permeability Oil & Gas Reservoirs in West China, Ministry of Education,
College of Petroleum Engineering, Xi’an
Shiyou University, Xi’an 710065, China
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2
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Yin D, Guo Y, Xu T, Ma J. Investigation of thia-Diels-Alder Reactions by Ultrafast Transient Absorption Spectroscopy and DFT Calculations. ACS Omega 2024; 9:14436-14441. [PMID: 38559932 PMCID: PMC10976361 DOI: 10.1021/acsomega.4c00235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 01/31/2024] [Accepted: 02/23/2024] [Indexed: 04/04/2024]
Abstract
The thia-Diels-Alder reaction represents a versatile synthetic method for the preparation of six-membered sulfur-containing compounds. However, the mechanism of the thia-Diels-Alder reactions remains unclear. In this work, time-resolved spectroscopic experiments and DFT calculations demonstrate that phenacyl sulfide undergoes Norrish II cleavage to produce thioaldehyde, and ortho-hydroxy benzhydryl alcohol occurs in a dehydration reaction to generate o-QMs using diphenylphosphate as the catalyst. Then, the thia-Diels-Alder reaction takes place between thioaldehyde and o-QMs by an asynchronous concerted mechanism. The illustration of the thia-Diels-Alder reaction mechanism not only provides important support for organic synthesis and drug design but also enhances fundamental insights into reaction pathways and catalytic processes in the field of chemical synthesis.
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Affiliation(s)
- Dandan Yin
- Key
Laboratory of Synthetic and Natural Functional Molecule Chemistry
of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710127, China
| | - Yan Guo
- Key
Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education,
School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China
| | - Tongyu Xu
- Key
Laboratory of Synthetic and Natural Functional Molecule Chemistry
of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710127, China
| | - Jiani Ma
- Key
Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education,
School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China
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3
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Fan P, Liu Y, He Y, Hu Y, Chao L, Wang Y, Liu L, Li J. Experimental Study on the Mechanism and Law of Low-Salinity Water Flooding for Enhanced Oil Recovery in Tight Sandstone Reservoirs. ACS Omega 2024; 9:12665-12675. [PMID: 38524499 PMCID: PMC10955587 DOI: 10.1021/acsomega.3c07960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 12/06/2023] [Accepted: 01/23/2024] [Indexed: 03/26/2024]
Abstract
Currently, research surrounding low-salinity water flooding predominantly focuses on medium- to high-permeability sandstone reservoirs. Nevertheless, further investigation is necessary to implement this technique with regard to tight sandstone reservoirs. The present study comprises a series of experiments conducted on the crude oil and core of the Ordos Chang 6 reservoir to investigate the influence of ionic composition on low-salinity water flooding in tight oil reservoirs. The change in wettability on the rock surface was analyzed by using the contact angle experiment. The change in recovery rate was analyzed using a core displacement experiment. The reaction between rock fluids was analyzed using an ion chromatography experiment. Additionally, a nuclear magnetic resonance (NMR) experiment was used to analyze the mobilization law of crude oil and the change in wettability on the scale of the rock core. This led to a comprehensive discussion of the law and mechanism of enhancing the recovery rate via low-salinity water flooding from various perspectives. Experiments show that low-salinity water flooding is an effective technique for enhancing recovery in tight sandstone reservoirs. Altering the ionic composition of injected water can improve the water wettability of the rock surface and enhance recovery. Decreasing the mass concentration of Ca2+ or increasing the mass concentration of SO42- can prompt the ion-exchange reaction on the rock surface and detachment of polar components from the surface. Consequently, the wettability of the rock surface strengthens, augmenting the recovery process. Nuclear magnetic resonance experiments evidence that low-salinity water injection, with ion adjustment, significantly alters the interactions between the rock and fluid in tight sandstone reservoirs. As a result, the T2 signal amplitude decreases significantly, residual oil saturation reduces considerably, and the hydrophilic nature of the rock surface increases.
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Affiliation(s)
- Pingtian Fan
- State
Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
- Nanniwan
Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan’an 716000, China
| | - Yuetian Liu
- State
Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
| | - Yuting He
- State
Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
| | - Yuanping Hu
- Nanniwan
Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan’an 716000, China
| | - Leihui Chao
- Nanniwan
Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan’an 716000, China
| | - Yapeng Wang
- Nanniwan
Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan’an 716000, China
| | - Lang Liu
- Nanniwan
Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan’an 716000, China
| | - Jingpeng Li
- State
Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
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4
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Li Y, Shi Q, Yu X, Ning F, Liu G, Wang X, Wang J, Xu Y, Zhao Y. Trace Y Doping Regulated Bulk/Interfacial Reactions of P2-Layered Oxides for Ultrahigh-Rate Sodium-Ion Batteries. Small 2024:e2310756. [PMID: 38361223 DOI: 10.1002/smll.202310756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 12/26/2023] [Indexed: 02/17/2024]
Abstract
P2-phase layered cathodes play a pivotal role in sodium-ion batteries due to their efficient Na+ intercalation chemistry. However, limited by crystal disintegration and interfacial instability, bulk and interfacial failure plague their electrochemical performance. To address these challenges, a structural enhancement combined with surface modification is achieved through trace Y doping. Based on a synergistic combination of experimental results and density functional theory (DFT) calculations, the introduction of partial Y ions at the Na site (2d) acts as a stabilizing pillar, mitigating the electrostatic repulsions between adjacent TMO2 slabs and thereby relieving internal structural stress. Furthermore, the presence of Y effectively optimizes the Ni 3d-O 2p hybridization, resulting in enhanced electronic conductivity and a notable rapid charging ability, with a capacity of 77.3 mA h g-1 at 40 C. Concurrently, the introduction of Y also induces the formation of perovskite nano-islands, which serve to minimize side reactions and modulate interfacial diffusion. As a result, the refined P2-Na0.65 Y0.025 [Ni0.33 Mn0.67 ]O2 cathode material exhibits an exceptionally low volume variation (≈1.99%), an impressive capacity retention of 83.3% even at -40 °C after1500 cycles at 1 C.
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Affiliation(s)
- Yong Li
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
- Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China
| | - Qinhao Shi
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
| | - Xuan Yu
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
| | - Fanghua Ning
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
| | - Guoliang Liu
- Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China
| | - Xuan Wang
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
| | - Juan Wang
- Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China
| | - YunHua Xu
- Shaanxi Key Laboratory of Nanomaterials and Nanotechnology, Xi'an University of Architecture and Technology, Xi'an, 710055, P. R. China
| | - Yufeng Zhao
- Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, P. R. China
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5
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Yang ML, Yang HD, Tang ZS, Hu XH, Zhou R, Xue TT, Ma K, Ji C, Xu HB. Lignan and Phthalide Derivatives from the Rhizome of Ligusticum chuanxiong ( Rhizoma chuanxiong) and Evaluation of Their anti-Xanthine Oxidase Activities. ACS Omega 2023; 8:39855-39864. [PMID: 37901529 PMCID: PMC10601418 DOI: 10.1021/acsomega.3c06172] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Accepted: 09/21/2023] [Indexed: 10/31/2023]
Abstract
The previous research results showed that the extracts of ethyl acetate of the rhizome of Ligusticum chuanxiong (Rhizoma chuanxiong) possessed significant antigout effects in model mice. To explore the active ingredients responsible for the effects, phytochemical studies were performed, which led to the isolation of three rare 8', 9-linked neolignans, ligusticumins A-C (1-3), together with two novel phthalide-phenylpropanoid heterodimers, ligusticumalides A-B (4 and 5). It is noteworthy that 4 possesses an unprecedented 7-styryl phthalide skeleton. The structures and absolute configurations of 1-5 were elucidated by one-dimensional (1D) and two-dimensional (2D) NMR spectroscopy and electron-capture detector (ECD) spectroscopic methods. The bioassay results showed that compounds 1, 2, 3, and 5 presented moderate inhibitory activities against xanthine oxidase (XO) and 4 possessed a significant XO inhibitory effect with an IC50 value of 93.88 μM. This is the first time to investigate the anti-XO active ingredients of R. chuanxiong, which provides valuable information for searching for new antigout agents from natural products.
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Affiliation(s)
- Man-Li Yang
- Nanjing
University of Chinese Medicine, Nanjing 210023, People’s Republic of China
| | - Hao-Dong Yang
- Shaanxi
Collaborative Innovation Center of Chinese Medicine Resources Industrialization,
State Key Laboratory of Research & Development of Characteristic
Qin Medicine Resources (Cultivation), Shaanxi Innovative Drug Research
Center, Shaanxi University of Chinese Medicine, Xianyang 712046, People’s Republic of China
| | - Zhi-Shu Tang
- Shaanxi
Collaborative Innovation Center of Chinese Medicine Resources Industrialization,
State Key Laboratory of Research & Development of Characteristic
Qin Medicine Resources (Cultivation), Shaanxi Innovative Drug Research
Center, Shaanxi University of Chinese Medicine, Xianyang 712046, People’s Republic of China
- China
Academy of Chinese Medical Sciences, Beijing 100700, People’s Republic of China
| | - Xiao-Hui Hu
- Shaanxi
Collaborative Innovation Center of Chinese Medicine Resources Industrialization,
State Key Laboratory of Research & Development of Characteristic
Qin Medicine Resources (Cultivation), Shaanxi Innovative Drug Research
Center, Shaanxi University of Chinese Medicine, Xianyang 712046, People’s Republic of China
| | - Rui Zhou
- Shaanxi
Collaborative Innovation Center of Chinese Medicine Resources Industrialization,
State Key Laboratory of Research & Development of Characteristic
Qin Medicine Resources (Cultivation), Shaanxi Innovative Drug Research
Center, Shaanxi University of Chinese Medicine, Xianyang 712046, People’s Republic of China
| | - Tao-Tao Xue
- Shaanxi
Collaborative Innovation Center of Chinese Medicine Resources Industrialization,
State Key Laboratory of Research & Development of Characteristic
Qin Medicine Resources (Cultivation), Shaanxi Innovative Drug Research
Center, Shaanxi University of Chinese Medicine, Xianyang 712046, People’s Republic of China
| | - Kang Ma
- Shaanxi
Collaborative Innovation Center of Chinese Medicine Resources Industrialization,
State Key Laboratory of Research & Development of Characteristic
Qin Medicine Resources (Cultivation), Shaanxi Innovative Drug Research
Center, Shaanxi University of Chinese Medicine, Xianyang 712046, People’s Republic of China
| | - Chun Ji
- Shaanxi
Collaborative Innovation Center of Chinese Medicine Resources Industrialization,
State Key Laboratory of Research & Development of Characteristic
Qin Medicine Resources (Cultivation), Shaanxi Innovative Drug Research
Center, Shaanxi University of Chinese Medicine, Xianyang 712046, People’s Republic of China
| | - Hong-Bo Xu
- Shaanxi
Collaborative Innovation Center of Chinese Medicine Resources Industrialization,
State Key Laboratory of Research & Development of Characteristic
Qin Medicine Resources (Cultivation), Shaanxi Innovative Drug Research
Center, Shaanxi University of Chinese Medicine, Xianyang 712046, People’s Republic of China
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6
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Ouyang X, Jia N, Luo J, Li L, Xue J, Bu H, Xie G, Wan Y. DNA Nanoribbon-Assisted Intracellular Biosynthesis of Fluorescent Gold Nanoclusters for Cancer Cell Imaging. JACS Au 2023; 3:2566-2577. [PMID: 37772173 PMCID: PMC10523492 DOI: 10.1021/jacsau.3c00365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Revised: 08/02/2023] [Accepted: 08/07/2023] [Indexed: 09/30/2023]
Abstract
Metal nanoclusters (NCs) have emerged as a promising class of fluorescent probes for cellular imaging due to their high resistance to photobleaching and low toxicity. Nevertheless, their widespread use in clinical diagnosis is limited by their unstable intracellular fluorescence. In this study, we develop an intracellularly biosynthesized fluorescent probe, DNA nanoribbon-gold NCs (DNR/AuNCs), for long-term cellular tracking. Our results show that DNR/AuNCs exhibit a 4-fold enhancement of intracellular fluorescence intensity compared to free AuNCs. We also investigated the mechanism underlying the fluorescence enhancement of AuNCs by DNRs. Our findings suggest that the higher synthesis efficiency and stability of AuNCs in the lysosome may contribute to their fluorescence enhancement, which enables long-term (up to 15 days) fluorescence imaging of cancer cells (enhancement of ∼60 times compared to free AuNCs). Furthermore, we observe similar results with other metal NCs, confirming the generality of the DNR-assisted biosynthesis approach for preparing highly bright and stable fluorescent metal NCs for cancer cell imaging.
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Affiliation(s)
- Xiangyuan Ouyang
- Xi’an
Key Laboratory of Functional Supramolecular Structure and Materials,
Key Laboratory of Synthetic and Natural Functional Molecule of Ministry
of Education, College of Chemistry & Materials Science, Northwest University, Xi’an, Shaanxi 710127, P. R. China
| | - Nan Jia
- Xi’an
Key Laboratory of Functional Supramolecular Structure and Materials,
Key Laboratory of Synthetic and Natural Functional Molecule of Ministry
of Education, College of Chemistry & Materials Science, Northwest University, Xi’an, Shaanxi 710127, P. R. China
| | - Jing Luo
- Key
Laboratory of Resource Biology and Biotechnology in Western China
(Ministry of Education), College of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, PR China
| | - Le Li
- Xi’an
Key Laboratory of Functional Supramolecular Structure and Materials,
Key Laboratory of Synthetic and Natural Functional Molecule of Ministry
of Education, College of Chemistry & Materials Science, Northwest University, Xi’an, Shaanxi 710127, P. R. China
| | - Jiangshan Xue
- Key
Laboratory of Resource Biology and Biotechnology in Western China
(Ministry of Education), College of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, PR China
| | - Huaiyu Bu
- Key
Laboratory of Resource Biology and Biotechnology in Western China
(Ministry of Education), College of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, PR China
| | - Gang Xie
- Xi’an
Key Laboratory of Functional Supramolecular Structure and Materials,
Key Laboratory of Synthetic and Natural Functional Molecule of Ministry
of Education, College of Chemistry & Materials Science, Northwest University, Xi’an, Shaanxi 710127, P. R. China
| | - Ying Wan
- School
of Mechanical Engineering, Nanjing University
of Science and Technology, Nanjing 210094, China
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7
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Li RS, He YS, Cao ZL, Liu ZY, Wang YM, Li S, Xie Z. Valence Fluctuation of Uranium Ions in Uranium Sesquinitride Revealed by Dynamical Mean-field Theory Merged with Density Functional Theory. Chemphyschem 2023; 24:e202300242. [PMID: 37369624 DOI: 10.1002/cphc.202300242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 06/25/2023] [Accepted: 06/27/2023] [Indexed: 06/29/2023]
Abstract
The electronic properties, in particular, the occupation number of 5f electrons and the valence state of U ions in uranium sesquinitride (U2 N3 ) are studied by using density functional theory (DFT) calculations merged with dynamical mean-field theory (DMFT). The results demonstrate that j=5/2 and j=7/2 manifolds are in the weakly correlated metallic and weakly correlated insulating regimes, respectively. The quasi-particle weights indicate that LS coupling scheme is more feasible for 5f electrons, which are not in the orbital-selective localized state. The weighted summation of the occupation probabilities of 5fn (n=0,1,2,3,4) atomic configurations suggests that 5f electrons have the inter-configuration fluctuation, or the mixed-valence state for U ions, together with an average occupation number of 5f electrons n5f ∼2.234, which is in good agreement with the electron localization function (ELF) and occupation analysis based on other DFT-based calculations. The 5fn -mixing-driven inter-configuration fluctuation might originate from the dual nature of 5f electrons, and the flexible electronic configuration of U ions. Finally, the so-called quasiparticle band structure is also discussed.
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Affiliation(s)
- Ru-Song Li
- Shaanxi International Joint Research Center for Applied Technology of Controllable Neutron Source, School of Electronic Information, Xijing University, Xi'an, 710123, China
| | - Yu-Song He
- Shaanxi International Joint Research Center for Applied Technology of Controllable Neutron Source, School of Electronic Information, Xijing University, Xi'an, 710123, China
| | - Ze-Lin Cao
- Shaanxi International Joint Research Center for Applied Technology of Controllable Neutron Source, School of Electronic Information, Xijing University, Xi'an, 710123, China
| | - Zhi-Yong Liu
- Research Institute of Beijing High Technology, Beijing, 100077, China
| | - Yuan-Ming Wang
- Research Institute of Beijing High Technology, Beijing, 100077, China
| | - Sheng Li
- Shaanxi International Joint Research Center for Applied Technology of Controllable Neutron Source, School of Electronic Information, Xijing University, Xi'an, 710123, China
| | - Zheng Xie
- College of Rare Earth and Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, P. R. China
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8
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Liu Y, Zheng G, Li J, Yang N, Li J, Liu Z, Han Q, Zhao Y, Du F, He Y, Yan T. A Case Report of Cutaneous Anthrax Diagnosed by Using a Metagenomic Next-Generation Sequencing (mNGS) Approach. Infect Drug Resist 2023; 16:3601-3606. [PMID: 37309378 PMCID: PMC10257910 DOI: 10.2147/idr.s411717] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 05/24/2023] [Indexed: 06/14/2023] Open
Abstract
Anthrax is caused by Bacillus anthracis. Humans are mainly infected through contact with the fur and meat of livestock. The cutaneous form is the most common form. The skin lesions of typical cutaneous anthrax are characterized by shallow ulcers with black crusts, surrounded by small blisters and nonpitting edema of nearby tissues. Metagenomic next-generation sequencing (mNGS) is a new pathogenic detection method which is rapid and unbiased. We reported the first case of cutaneous anthrax diagnosed by mNGS. Ultimately, the man received prompt antibiotic therapy and had a good prognosis. In conclusion, mNGS is proved to be a good method for etiological diagnosis, especially for rare infectious diseases.
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Affiliation(s)
- Yushan Liu
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Institution of Hepatology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
| | - Gezhi Zheng
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Clinical Research Center for Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
| | - Jing Li
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Clinical Research Center for Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
| | - Nan Yang
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Institution of Hepatology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Clinical Research Center for Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Shaanxi Clinical Research Center for Infectious Diseases, Xi’an, Shaanxi, People’s Republic of China
| | - Juan Li
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Institution of Hepatology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
| | - Zhengwen Liu
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Institution of Hepatology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Clinical Research Center for Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Shaanxi Clinical Research Center for Infectious Diseases, Xi’an, Shaanxi, People’s Republic of China
| | - Qunying Han
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Institution of Hepatology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Clinical Research Center for Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Shaanxi Clinical Research Center for Infectious Diseases, Xi’an, Shaanxi, People’s Republic of China
| | - Yingren Zhao
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Institution of Hepatology, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Clinical Research Center for Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Shaanxi Clinical Research Center for Infectious Diseases, Xi’an, Shaanxi, People’s Republic of China
| | - Fenjing Du
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
- Clinical Research Center for Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
| | - Yingli He
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
| | - Taotao Yan
- Department of Infectious Diseases, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China
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9
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Fu D, Yu Z, Gao K, Duan Z, Wang Z, Guo W, Yang P, Zhang J, Yang B, Yang F, Wu Z. Thermodynamic Analysis on In Situ Underground Pyrolysis of Tar-Rich Coal: Secondary Reactions. ACS Omega 2023; 8:12805-12819. [PMID: 37065076 PMCID: PMC10099122 DOI: 10.1021/acsomega.2c08033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 03/21/2023] [Indexed: 06/19/2023]
Abstract
To develop the in situ underground pyrolysis process of tar-rich coal more scientifically, the effect of temperature and pressure on the distribution of pyrolysis products should be clarified. This paper selected the typical components in five distillates of light tar, phenol tar, naphthalene tar, washing tar, and anthracene tar as the main reaction products. 32 typical secondary reactions were constructed. Based on the thermodynamic analysis strategy, the variation of the Gibbs free energy and equilibrium constant of secondary reactions was investigated. The results showed that pressure mainly affected the reaction characteristics of molecule-increasing reactions. The Gibbs free energy value of the molecule-increasing reactions increased with increasing pressure. The trend that the reaction could proceed spontaneously gradually weakened. The initial temperature of some reactions that could proceed spontaneously would need to increase by dozens or even hundreds of degrees. Due to the influence of formation pressure, the generation of related components of light tar, naphthalene tar, washing tar, and anthracene tar would be inhibited to varying degrees in the in situ underground pyrolysis process. The secondary reactions related to phenol tar were equimolecular reactions, which were almost unaffected by stratal pressure. Axial pressure and confining pressure of different coal seam depths should be considered in the process of in situ underground pyrolysis.
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Affiliation(s)
- Deliang Fu
- Key
Laboratory of Coal Resources Exploration and Comprehensive Utilization,
Ministry of Natural and Resources, Shaanxi
Provincial Coal Geology Group Co., Ltd., Xi’an 710026, China
| | - Zunyi Yu
- Shanxi
Key Laboratory of Energy Chemical Process Intensification, School
of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Kun Gao
- Shanxi
Key Laboratory of Energy Chemical Process Intensification, School
of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Zhonghui Duan
- Key
Laboratory of Coal Resources Exploration and Comprehensive Utilization,
Ministry of Natural and Resources, Shaanxi
Provincial Coal Geology Group Co., Ltd., Xi’an 710026, China
| | - Zhendong Wang
- Key
Laboratory of Coal Resources Exploration and Comprehensive Utilization,
Ministry of Natural and Resources, Shaanxi
Provincial Coal Geology Group Co., Ltd., Xi’an 710026, China
| | - Wei Guo
- Shanxi
Key Laboratory of Energy Chemical Process Intensification, School
of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Panxi Yang
- Shanxi
Key Laboratory of Energy Chemical Process Intensification, School
of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Jie Zhang
- Shanxi
Key Laboratory of Energy Chemical Process Intensification, School
of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Bolun Yang
- Shanxi
Key Laboratory of Energy Chemical Process Intensification, School
of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
| | - Fu Yang
- Key
Laboratory of Coal Resources Exploration and Comprehensive Utilization,
Ministry of Natural and Resources, Shaanxi
Provincial Coal Geology Group Co., Ltd., Xi’an 710026, China
| | - Zhiqiang Wu
- Shanxi
Key Laboratory of Energy Chemical Process Intensification, School
of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
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10
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Wen XR, Zhu WQ, Zhang CL, Li H, Zhang J, Yang MG, Kou YL, Liu YX, Li Y. Synthesis of α-CF 3 Amides via Palladium-Catalyzed Carbonylation of 2-Bromo-3,3,3-trifluoropropene. ACS Omega 2023; 8:7128-7134. [PMID: 36844566 PMCID: PMC9948557 DOI: 10.1021/acsomega.2c08206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 01/27/2023] [Indexed: 06/18/2023]
Abstract
Amide compounds are important organic compounds, which play an important role in biomedical chemistry, materials science, life science, and other fields. The synthesis of α-CF3 amides, especially compounds containing 3-(trifluoromethyl)-1,3,4,5-tetrahydro-2H-benzo[b][1,4]diazepine-2-one, has long been a challenge due to the tensile properties and instability of the rings. Here, we report an example of palladium-catalyzed carbonylation of CF3-containing olefin to form α-CF3 acrylamide. By controlling the ligands, we can get different amide compounds as products. This method has good substrate adaptability and functional group tolerance.
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Affiliation(s)
- Xiao Rui Wen
- School
of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China
| | - Wen Qing Zhu
- School
of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China
| | - Cai Lin Zhang
- School
of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China
| | - Hong Li
- School
of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China
| | - Jin Zhang
- School
of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China
| | - Min Ge Yang
- School
of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China
| | - Yong Li Kou
- Shaanxi
Coal Chemical Industry Technology Research Institute Co., Ltd., Xi’an 710065, China
| | - Yu Xia Liu
- Shaanxi
Natural Carbohydrate Resource Engineering Research Center, College
of Food Science and Technology, Northwest
University, Xi’an 710127, China
| | - Yang Li
- School
of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710048, China
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11
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Wang W, Li X, Wei Z, Xin Y, Xiao R, Yang H, Chen X. Effect of CO 2-Brine-Rock Interactions on the Pore Structure of the Tight Sandstone during CO 2 Flooding: A Case Study of Chang 7 Member of the Triassic Yanchang Formation in the Ordos Basin, China. ACS Omega 2023; 8:3998-4009. [PMID: 36743022 PMCID: PMC9893740 DOI: 10.1021/acsomega.2c06805] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 12/30/2022] [Indexed: 06/01/2023]
Abstract
CO2 flooding is an effective technique to enhance oil recovery from tight sandstone reservoirs. The CO2-rich fluid reacts with the in situ minerals and results in the corrosion and precipitation of minerals in the sandstone, affecting the connectivity and morphological features of pores. However, the diagenesis of the tight sandstone is complex, and the structural modification behavior and mechanism in different lithofacies of tight sandstone during CO2 flooding are still unclear. This study combined CO2 flooding, thin-section casting, scanning electron microscopy, nuclear magnetic resonance, X-ray diffraction, and fractal analysis methods to investigate the changes in the pore structure of tight sandstone after CO2 flooding. The results show that the cement of the tight sandstone is complex and diverse. The tight sandstone can be divided into two types of lithofacies: clay cementation (CL) and ferrocalcite cementation (CA). The mineralogical alterations occur differently in each lithofacies of tight sandstone. Alterations in the cement minerals affect the pores morphology of tight sandstone depending on their mineralogical structure and texture, and the CO2 flooding mainly changes the micromorphology and heterogeneity of large pores. Clay minerals dominate the cement in the CL lithofacies of tight sandstone. The dissolution mainly occurs in small pores because the precipitation of new minerals and exfoliation of skeleton particles partially block large pores and transform them into small pores. Thus, the number of small pores of CL lithofacies increases while the number of large pores decreases. Such a phenomenon hinders the increase in porosity and permeability. On the other side, in the CA lithofacies of tight sandstone, the cement is dominated by ferrocalcite, and the dissolution of ferrocalcite is the primary mechanism of mineralogical alteration. As the ferrocalcite dissolution expands, it creates new flow paths, improving the connectivity of pores. The petrophysical properties of CA lithofacies improve significantly after CO2 flooding. There is a crucial need to study the changes in diagenetic characteristics of tight sandstone due to CO2 flooding. Such type of study provides insights related to the improvement and evaluation of the development of tight sandstone reservoirs during CO2 flooding.
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Affiliation(s)
- Wei Wang
- College
of Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, P. R. China
| | - Xinyu Li
- No.
1 Oil Production Plant, Petrochina Changqing
Oilfield Company, Yan’an 716000, Shaanxi, P. R. China
| | - Zhikun Wei
- No.
1 Oil Production Plant, Petrochina Changqing
Oilfield Company, Yan’an 716000, Shaanxi, P. R. China
| | - Yuandan Xin
- No.
1 Oil Production Plant, Petrochina Changqing
Oilfield Company, Yan’an 716000, Shaanxi, P. R. China
| | - Rong Xiao
- Exploration
and Development Technology Research Center, Yanchang Oilfield Co. Ltd., Yan’an 716000, Shaanxi, P. R. China
| | - Hongxin Yang
- Exploration
and Development Technology Research Center, Yanchang Oilfield Co. Ltd., Yan’an 716000, Shaanxi, P. R. China
| | - Xiaoliang Chen
- College
of Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, P. R. China
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12
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Gao H, Zhang J, Zong S, Zhang C, Li H, Huang G. Experimental Study of Preheated Secondary Air on the Performance of an Updraft Coal Heating Stove. ACS Omega 2022; 7:46090-46098. [PMID: 36570222 PMCID: PMC9773344 DOI: 10.1021/acsomega.2c03825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
Although the Chinese government encourages using clean fuels for heating, many households in remote areas still rely on coal as their energy, especially in the Qinghai Tibet Plateau. An updraft coal heating stove was modified to preheat secondary air. The performance of the modified stove was studied compared with a baseline stove. The temperatures in the combustion chamber and near the chimney exit are measured, and the undiluted exhaust concentrations of CO, NO x , and SO2 are obtained. The results indicated that the temperatures and exhaust gas concentrations varied periodically with the coal addition. The oxygen concentration in the flue gas for the modified stove is higher than that for the baseline stove, and the O2 concentration was decreased with the increase in fuel feed rate. The CO concentration peaked 5-15 min after fuel addition and descended quickly toward a baseline with the higher fuel feed rates. It remained almost unchanged at the beginning and then slightly increased when the combustion began to fade with a lower fuel feed rate for the modified stove. The NO x emission for the modified stove is generally lower than that for the baseline stove. The NO x formation during coal combustion mainly comes from prompt NO and fuel NO, while the SO2 emission is mainly related to the sulfur element in the raw coal in the present work. The modified stove is effective in reducing NO x and SO2 emissions. However, the CO emission of the modified stove is higher than that of the baseline stove, especially at the end of the batch.
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Affiliation(s)
- Huaibin Gao
- School of Mechanical
Engineering, Xi’an University of
Science and Technology, Xi’an, Shaanxi 710054, China
| | - Jianing Zhang
- School of Mechanical
Engineering, Xi’an University of
Science and Technology, Xi’an, Shaanxi 710054, China
| | - Shouchao Zong
- School of Mechanical
Engineering, Xi’an University of
Science and Technology, Xi’an, Shaanxi 710054, China
| | - Chuanwei Zhang
- School of Mechanical
Engineering, Xi’an University of
Science and Technology, Xi’an, Shaanxi 710054, China
| | - Hongjun Li
- Special Equipment Research Institute of
Xi’an, Xi’an, Shaanxi 710032, China
| | - Guanghong Huang
- Special Equipment Research Institute of
Xi’an, Xi’an, Shaanxi 710032, China
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13
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Zhang JW, Feng K, Diaham S, Liao QQ, Zhou X, Putson C. Lifetime Evaluation of Photovoltaic Polymeric Backsheets under Ultraviolet Radiation: From Chemical Properties to Mechanical Modeling. ACS Omega 2022; 7:45609-45616. [PMID: 36530300 PMCID: PMC9753168 DOI: 10.1021/acsomega.2c06424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 11/17/2022] [Indexed: 06/17/2023]
Abstract
Photovoltaic (PV) power generation plays a significant role with the increase of installed capacity of renewable energy. The effects of environmental stress on insulating backsheets have been considered as the main cause of failure in PV systems. However, traditional aging models are difficult to realize the comprehensive evaluation of the lifetime of insulating backsheets. In this paper, the analytical method of complex chemical degradation related to the insulation was replaced by a physics-based method to quantify the elongation at the break as a function of time corresponding to temperature and radiation. In contrast to traditional aging models, this model simply used one parameter, namely drop-off rate (v), to reflect the degradation of polymers under various environmental stresses. The effect of ultraviolet (UV) radiation on the model was considered. Moreover, the electrical degradation, chemical changes, and mechanical properties caused by UV radiation were investigated to provide the reference for the lifetime of evaluation. The research is significant for comprehensively evaluating the lifetime of insulating materials for PV systems and other power equipment.
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Affiliation(s)
- Jia-Wei Zhang
- School
of Electrical Engineering, Xi’an
University of Technology, Xi’an, Shannxi710048, China
| | - Kai Feng
- School
of Electrical Engineering, Xi’an
University of Technology, Xi’an, Shannxi710048, China
| | - Sombel Diaham
- Université
de Toulouse, UPS, INPT, LAPLACE (Laboratoire Plasma et Conversion
d’Energie), 118 route de Narbonne, F-31062Toulouse cedex 9, France
| | | | - Xing Zhou
- Faculty
of Printing, Packaging Engineering
and Digital Media Technology, Xi’an
University of Technology, Xi’an, Shannxi710048, China
| | - Chatchai Putson
- Materials
Physics Laboratory, Department of Physics, Faculty of Science, Prince of Songkla University (PSU), Songkhla90112, Thailand
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14
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Chen K, Peng H, Zhang J, Chen P, Ruan J, Li B, Wang Y. Optimized Demand-Side Day-Ahead Generation Scheduling Model for a Wind-Photovoltaic-Energy Storage Hydrogen Production System. ACS Omega 2022; 7:43036-43044. [PMID: 36519112 PMCID: PMC9744089 DOI: 10.1021/acsomega.2c05319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 10/27/2022] [Indexed: 06/17/2023]
Abstract
This paper proposed an optimized day-ahead generation model involving hydrogen-load demand-side response, with an aim to make the operation of an integrated wind-photovoltaic-energy storage hydrogen production system more cost-efficient. Considering the time-of-use electricity pricing plan, demand for hydrogen load, and the intermittency of renewable energy, the model has the ambition to achieve minimum daily cost of operating a hydrogen production system. The model is power-balanced, fit for energy storage devices, and developed through adaptive simulated annealing particle swarm optimization. Analysis results showed that the proposed optimized scheduling model helped avoid the significant purchase of electric power at peak times and reduced the cost of running the hydrogen production system, ensuring that the daily hydrogen energy produced could meet the daily demand for the gas load. This justified how the model and its algorithm were correctly and efficiently applied.
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Affiliation(s)
- Kang Chen
- Institute
of Solar Engineering Technology, Northwest
Engineering Corporation Limited, PowerChina, Xi’an710065, China
| | - Huaiwu Peng
- Institute
of Solar Engineering Technology, Northwest
Engineering Corporation Limited, PowerChina, Xi’an710065, China
| | - Junfeng Zhang
- Institute
of Solar Engineering Technology, Northwest
Engineering Corporation Limited, PowerChina, Xi’an710065, China
| | - Pengfei Chen
- Institute
of Solar Engineering Technology, Northwest
Engineering Corporation Limited, PowerChina, Xi’an710065, China
| | - Jingxin Ruan
- State
Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an710049, China
| | - Biao Li
- State
Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an710049, China
| | - Yueshe Wang
- State
Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an710049, China
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15
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Lu C, Cheng W, Sun X, Ren J, Wang M, Wan T. Influence of Aeration Pipe Length on Oxygen Mass Transfer Efficiency in Terms of Bubble Motion Flow Field. ACS Omega 2022; 7:39624-39635. [PMID: 36385896 PMCID: PMC9647712 DOI: 10.1021/acsomega.2c00974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
Improving the gas-liquid mass transfer efficiency in microporous aeration technology is the key to strengthening the restoration effect of black and odorous water bodies. However, the effect of bubble motion characteristics on oxygen mass transfer has not been systematically studied, which limits the efficient and economical application of microporous aeration remediation technology in black and odorous water. The influence under different aeration pipe lengths was analyzed for oxygen mass transfer and bubble movement in microporous aeration technology. The aeration pipe length (0.1-0.5 m) was positively correlated (R = 1.000, R = 0.997) with the number of bubbles and the specific surface area of bubbles and negatively correlated with the time-average velocity of bubbles and Sauter average diameter (R = -0.999, R = -0.997). Moreover, the increase in pipe length weakened the disturbance intensity of plume to water body. The results of oxygen mass transfer showed that the oxygen mass transfer coefficient (K L a) and oxygen utilization rate (E A) increased (K L a from 1.96 to 4.57 h-1, E A from 6.47 to 15.07%) with the increase of pipe length, which was significantly positively correlated (R = 0.985, R = 0.969) with the number of bubbles and bubble specific surface area (S b). This study provided theoretical parameters for the mechanism of oxygen mass transfer during microporous aeration.
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Affiliation(s)
- Cheng Lu
- School
of Architecture & Civil Engineering, Xi’an University of Science & Technology, Xi’an710054, China
| | - Wen Cheng
- Institute
of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an710048, China
| | - Xiaohui Sun
- Dezhou
Water Conservancy Bureau, Dezhou253000, China
| | - Jiehui Ren
- Institute
of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an710048, China
| | - Min Wang
- Institute
of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an710048, China
| | - Tian Wan
- Institute
of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an710048, China
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16
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Zhang J, Zhou S, Su Y, Luo Z, Wang T. Experimental Study of the Influence of H 2/CO on the CH 4 Explosion Pressure and Thermal Behaviors. ACS Omega 2022; 7:32432-32441. [PMID: 36120051 PMCID: PMC9476179 DOI: 10.1021/acsomega.2c03926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 08/17/2022] [Indexed: 06/15/2023]
Abstract
In a spontaneous coal combustion environment and in the coal chemical process, multiple gases, such as CH4, H2, and CO, coexist, and explosion accidents are prone to occur. The causes of these disasters and the explosion characteristics are key to formulating preventive measures. To explore the effect of H2/CO on the explosion pressure and thermal behavior of methane-air, CH4 with initial volume fractions of 7, 9.5, and 12%, which correspond to three states of oxygen enrichment, equivalence ratio, and oxygen depletion, was selected. Moreover, a mixed fuel system is composed of H2/CO with different volume ratios. A 20 L spherical gas explosion experimental system was used to test the peak explosion overpressure P max, the maximum explosion overpressure rise rate (dP/dt)max, and the corresponding time parameters of the H2/CO-CH4 mixed system. Combined with the thermodynamic calculation model, laminar burning velocity S L, explosion heat loss q tra, and other parameters were obtained. The results show that due to the existence of the damping effect, CO has the dual characteristic of promoting or weakening methane explosions. Compared with CO, the effect of H2 on the methane explosion is more significant, and the improvement or weakening of the laminar combustion rate of the reaction system by CO "lags" behind that of H2. The heat loss in the process of a gas explosion is affected by factors such as the heat release rate, the propagation speed of the combustion wave, and the heat dissipation effect of the container wall. When H2/CO increases the laminar burning velocity of the mixed system, the heat loss decreases accordingly. This study also found that the laminar burning velocity model of the mixed gas based on the ideal spherical flame propagation theory is not fully applicable to the H2/CO/CH4 mixed system in a spherical closed space, and the calculation results have large errors when the mixed system is close to the upper limit of the explosion.
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Affiliation(s)
- Jiang Zhang
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology, 58# Yanta Middle Road, Xi’an, Shaanxi 710054, United States
- Journal
Center, Xi’an University of Science
and Technology, Xi’an, Shaanxi 710054, United States
- Shaanxi
Industrial Process Safety and Emergency Rescue Engineering Technology
Research Center, 58#
Yanta Middle Road, Xi’an, Shaanxi 710054, United
States
| | - Shangyong Zhou
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology, 58# Yanta Middle Road, Xi’an, Shaanxi 710054, United States
| | - Yang Su
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology, 58# Yanta Middle Road, Xi’an, Shaanxi 710054, United States
| | - Zhenmin Luo
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology, 58# Yanta Middle Road, Xi’an, Shaanxi 710054, United States
- Shaanxi
Industrial Process Safety and Emergency Rescue Engineering Technology
Research Center, 58#
Yanta Middle Road, Xi’an, Shaanxi 710054, United
States
| | - Tao Wang
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology, 58# Yanta Middle Road, Xi’an, Shaanxi 710054, United States
- Shaanxi
Industrial Process Safety and Emergency Rescue Engineering Technology
Research Center, 58#
Yanta Middle Road, Xi’an, Shaanxi 710054, United
States
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17
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Abstract
The mechanism of oxidizing reaction in the preparation of graphene oxide (GO) by a chemical oxidation method remains unclear. The main oxidant of graphite oxide has not been determined. Here, we show a new mechanism in which Mn2O7, the main oxidant, is heated to decompose oxygen atoms and react with graphite. The whole preparation process constitutes of four distinct independent steps, different from the three steps of literature registration, and each step has its own chemical oxidation reaction. In the first step, concentrated sulfuric acid and nitric acid are intercalated between graphite layers in the form of a molecular thermal motion to produce HNO3-H2SO4-GIC. In the second step, Mn2O7 is intercalated between graphite layers in the molecular convection-diffusion to Mn2O7-H2SO4-GIC. In the third step, Mn2O7 is decomposed by heat. Oxygen atoms are generated to oxidize the defects in the graphite layer to PGO. This discovery is the latest and most important. In the fourth step, PGO is purified with deionized water, hydrogen peroxide, and hydrochloric acid to GO. Optical microscopy, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction spectrometry, and scanning electron microscopy analytical evidence was used for confirming Mn2O7 as the main oxidant and the structure of GO. This work provides a more plausible explanation for the mechanism of oxidizing reaction in the preparation of GO by a chemical oxidation method.
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Affiliation(s)
- Xiaodong Chen
- School
of Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, P. R. China
- Shaanxi
Key Laboratory of Clean Utilization of Low-Metamorphic Coal, Yulin 719000, Shaanxi, P. R. China
| | - Zhan Qu
- School
of Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, P. R. China
- Shaanxi
Key Laboratory of Clean Utilization of Low-Metamorphic Coal, Yulin 719000, Shaanxi, P. R. China
| | - Zhe Liu
- School
of Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, P. R. China
- Shaanxi
Key Laboratory of Clean Utilization of Low-Metamorphic Coal, Yulin 719000, Shaanxi, P. R. China
| | - Guoyu Ren
- School
of Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, P. R. China
- Shaanxi
Key Laboratory of Clean Utilization of Low-Metamorphic Coal, Yulin 719000, Shaanxi, P. R. China
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18
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Cao YJ, Lu CY, Zhang ZW, Wang Z, Kang YH, Yang TT, Liu GH, Wei XY, Bai HC. N/O Co-doped Porous Carbons Derived from Coal Tar Pitch for Ultra-high Specific Capacitance Supercapacitors. ACS Omega 2022; 7:23342-23352. [PMID: 35847265 PMCID: PMC9281300 DOI: 10.1021/acsomega.2c01534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
In this paper, a series of N/O co-doped porous carbons (PCs) were designed and used to prepare coal tar pitch-based supercapacitors (SCs). The introduction of N/O species under the intervention of urea effectively improves the pseudocapacitance of PCs. The results show that the specific surface area of synthesized N3PC4-700 is 1914 m2 g-1, while the N and O contents are 1.3 and 7.2%, respectively. The unique interconnected pore structure and proper organic N/O co-doping, especially the introduction of pyridine-N and pyrrole-N, are beneficial for improving the electrochemical performance of PCs. In the three-electrode system, the specific capacitance and rate capability of N3PC4-700 are 532.5 F g-1 and 72.5% at the current densities of 0.5 and 20 A g-1, respectively. In addition, the specific capacitance of N3PC4-700 in a coin-type symmetric device is 315.5 F g-1 at 0.5 A g-1. The N3PC4-700 electrode provides an energy density of 43.8 W h kg-1 with a power density of 0.5 kW kg-1 and still maintains a value of 29.7 at 10 kW kg-1. After 10,000 charge/discharge cycles, the retention rate was as high as 96.7%. In order to obtain high-performance carbon-based SCs, the effective identification and regulation of organic N/O species is necessary.
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Affiliation(s)
- Yuan-Jia Cao
- Shaanxi
Key Laboratory of Low Metamorphic Coal Clean Utilization, School of
Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, China
| | - Cui-Ying Lu
- Shaanxi
Key Laboratory of Low Metamorphic Coal Clean Utilization, School of
Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, China
- . Phone: +86 0912 3891144. Fax: +86 0912 3891144
| | - Zhi-Wen Zhang
- Shaanxi
Key Laboratory of Low Metamorphic Coal Clean Utilization, School of
Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, China
| | - Zhen Wang
- Shaanxi
Key Laboratory of Low Metamorphic Coal Clean Utilization, School of
Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, China
| | - Yu-Hong Kang
- Shaanxi
Key Laboratory of Low Metamorphic Coal Clean Utilization, School of
Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, China
| | - Ting-Ting Yang
- Shaanxi
Key Laboratory of Low Metamorphic Coal Clean Utilization, School of
Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, China
| | - Guang-Hui Liu
- Shaanxi
Key Laboratory of Low Metamorphic Coal Clean Utilization, School of
Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, China
- Anhui
Key Laboratory of Coal Clean Conversion and High Valued Utilization, Anhui University of Technology, Ma’anshan 243002, Anhui, China
- State
Key Laboratory of High-efficiency Coal Utilization and Green Chemical
Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, Ningxia, China
| | - Xian-Yong Wei
- Shaanxi
Key Laboratory of Low Metamorphic Coal Clean Utilization, School of
Chemistry and Chemical Engineering, Yulin
University, Yulin 719000, Shaanxi, China
- State
Key Laboratory of High-efficiency Coal Utilization and Green Chemical
Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, Ningxia, China
- Key
Laboratory of Coal Processing and Efficient Utilization, Ministry
of Education, China University of Mining
& Technology, Xuzhou 221116, Jiangsu, China
| | - Hong-Cun Bai
- State
Key Laboratory of High-efficiency Coal Utilization and Green Chemical
Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, Ningxia, China
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19
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Gao H, Zhou HM, Yue SJ, Feng LM, Guo DY, Li JJ, Zhao Q, Huang L, Tang YP. Oral Bioavailability-Enhancing and Anti-obesity Effects of Hydroxysafflor Yellow A in Natural Deep Eutectic Solvent. ACS Omega 2022; 7:19225-19234. [PMID: 35721932 PMCID: PMC9202288 DOI: 10.1021/acsomega.2c00457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 05/26/2022] [Indexed: 05/11/2023]
Abstract
Hydroxysafflor yellow A (HSYA), a primary active component in Carthami Flos, has been extensively applied in the treatment of cardiometabolic diseases. In this study, a natural deep eutectic solvent composed of glucose and choline chloride with 10% (v/v) of water (90% GCH) was evaluated to enhance the oral absorption of HSYA. Compared with HSYA in water, the relative oral bioavailability of HSYA in 90% GCH was increased to 326.08%. Furthermore, 90% GCH was demonstrated to decrease the mucus viscosity and increase the absorption rate constant of HSYA in the jejunum by 2.95 times. A pharmacodynamic study revealed that HSYA in 90% GCH was more effective in reducing body weight and correcting steatohepatitis and dyslipidemia in high-fat diet-induced obese rats. Serum metabolomics results showed that the correction of serum aromatic amino acid disorder may contribute to the anti-obesity effect of HSYA in 90% GCH. In conclusion, 90% GCH could be a delivery carrier for HSYA against obesity.
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Affiliation(s)
- Huan Gao
- Key
Laboratory of Shaanxi Administration of Traditional Chinese Medicine
for TCM Compatibility, Shaanxi University
of Chinese Medicine, Xi’an 712046, China
| | - Hao-Ming Zhou
- Key
Laboratory of Shaanxi Administration of Traditional Chinese Medicine
for TCM Compatibility, Shaanxi University
of Chinese Medicine, Xi’an 712046, China
| | - Shi-Jun Yue
- Key
Laboratory of Shaanxi Administration of Traditional Chinese Medicine
for TCM Compatibility, Shaanxi University
of Chinese Medicine, Xi’an 712046, China
| | - Li-Mei Feng
- Key
Laboratory of Shaanxi Administration of Traditional Chinese Medicine
for TCM Compatibility, Shaanxi University
of Chinese Medicine, Xi’an 712046, China
| | - Dong-Yan Guo
- Key
Laboratory of Shaanxi Administration of Traditional Chinese Medicine
for TCM Compatibility, Shaanxi University
of Chinese Medicine, Xi’an 712046, China
| | - Jia-Jia Li
- Key
Laboratory of Shaanxi Administration of Traditional Chinese Medicine
for TCM Compatibility, Shaanxi University
of Chinese Medicine, Xi’an 712046, China
| | - Qi Zhao
- Key
Laboratory of Shaanxi Administration of Traditional Chinese Medicine
for TCM Compatibility, Shaanxi University
of Chinese Medicine, Xi’an 712046, China
| | - Lu Huang
- Key
Laboratory of Shaanxi Administration of Traditional Chinese Medicine
for TCM Compatibility, Shaanxi University
of Chinese Medicine, Xi’an 712046, China
| | - Yu-Ping Tang
- Key
Laboratory of Shaanxi Administration of Traditional Chinese Medicine
for TCM Compatibility, Shaanxi University
of Chinese Medicine, Xi’an 712046, China
- State
Key Laboratory of Research & Development of Characteristic Qin
Medicine Resources (Cultivation), and Shaanxi Collaborative Innovation
Center of Chinese Medicinal Resources Industrialization, Shaanxi University of Chinese Medicine, Xi’an 712046, China
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20
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Li J, Tian A, Wang X, Zhai Z, Zhang X, Feng B, Yao S, Du H. Dendrite Growth and Performance of Self-Healing Composite Electrode IPMC Driven by Cu 2. ACS Omega 2022; 7:17575-17582. [PMID: 35664629 PMCID: PMC9161267 DOI: 10.1021/acsomega.1c07319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 05/06/2022] [Indexed: 06/15/2023]
Abstract
As a kind of flexible intelligent driving material, ionic polymer-metal composite (IPMC) has attracted the attention of researchers due to its advantages of lightweight, large deformation, and fast response. However, the reciprocating bending of IPMC causes cracks to appear on the surface metal electrode layer and reduces the water uptake (WUP). At the same time, the metal particles are extruded, resulting in an increase in resistivity, which affects the driving performance of the materials. Therefore, in this study, considering the preparation cost, Cu-Pt-IPMC using Pt and Cu as a composite electrode with the self-healing system was prepared by electroless plating and Cu2+ was used as driving ions that can form a reversible circulation system with a copper electrode. The WUP, surface resistivity, and driving performance were tested and analyzed and the surface roughness was characterized by Matlab. The results show that the dendritic interface electrodes (DIEs) appear at the contact interface between the metal electrode and the film, which extend deeper and wider in the film with the increase in the cycles of autocatalytic platinum plating (ACP-Pt), and the output displacement and blocking force of 61.20 mm and 34.26 mN, respectively, have been achieved in the Cu-Pt-IPMC sample after three cycles of ACP-Pt. Based on these analyses, this study proves that the presence of Cu2+ can repair the cracked electrode on the surface of IPMC and reduce the surface electrode resistance, improving the driving performance.
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Affiliation(s)
- Jiahua Li
- School
of Materials Science and Engineering, Xi’an
University of Science and Technology, Xi’an 710054, China
| | - Aifen Tian
- School
of Materials Science and Engineering, Xi’an
University of Science and Technology, Xi’an 710054, China
| | - Xixi Wang
- School
of Materials Science and Engineering, Xi’an
University of Science and Technology, Xi’an 710054, China
| | - Zhengxin Zhai
- School
of Materials Science and Engineering, Xi’an
University of Science and Technology, Xi’an 710054, China
| | - Xinrong Zhang
- Key
Laboratory of Expressway Construction Machinery of Shaanxi Province, Chang’an University, Xi’an 710064, China
| | - Bin Feng
- School
of Mechanical Engineering, Xi’an
University of Science and Technology, Xi’an 710054, China
| | - Shanshan Yao
- Department
of Mechanical Engineering, 161 Light Engineering, Stony Brook University, Stony
Brook, New York 11794, United States
| | - Huiling Du
- School
of Materials Science and Engineering, Xi’an
University of Science and Technology, Xi’an 710054, China
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21
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Chen L, Liao X, Tang S, Feng S, Tang R, Jiang S, Dong Y. CO 2-Low Interfacial Tension Viscoelastic Fluid Synergistic Flooding in Tight Reservoirs. ACS Omega 2022; 7:6271-6279. [PMID: 35224389 PMCID: PMC8867575 DOI: 10.1021/acsomega.1c06803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
Tight oil reservoirs have poor physical properties, insufficient formation energy, and low natural productivity. CO2 flooding is an important technical mean that enhances the oil recovery of dense reservoirs and achieves effective CO2 sequestration, but strong heterogeneity of the tight oil reservoir usually results in gas channeling and poor enhanced oil recovery effect. The existing methods to prevent gas channeling are mainly to use the small-molecule amine system and the polymer gel system to plug fracture and high permeability channels. The small-molecular amine system has low flash points and pollutes the environment and the polymer gel has poor injectivity and great damage to the formation, which limit their large-scale application. Therefore, a new viewpoint of CO2-low interfacial tension viscoelastic fluid synergistic flooding for enhanced oil recovery in a tight oil reservoir was made. The performance of low interfacial tension viscoelastic fluid (GOBT) was studied. The injectivity and oil displacement effect of CO2-GOBT synergistic flooding were evaluated, and the mechanism of CO2-GOBT synergistic flooding was discussed. The experimental results showed that 0.4% GOBT is a low interfacial tension viscoelastic fluid, which has strong adaptability to the salinity water of tight oil reservoirs (6788-80,000 mg/L), good viscosity stability at different pHs, excellent capacity to emulsify crude oil, and the ability to improve reservoir water wettability. CO2 alternating 0.4% GOBT flooding has good injection ability in cores (K a = 0.249 mD), and injecting 0.4% GOBT can effectively increase the injection pressure of subsequent CO2 flooding. CO2 alternating 0.4% GOBT flooding can effectively improve water flooding recovery in tight sandstone reservoirs, which is better than CO2 flooding and 0.4% GOBT flooding in both homogeneous and heterogeneous conditions. The mechanisms of CO2 alternating 0.4% GOBT flooding to enhance the oil recovery include that GOBT and CO2 foam block high permeability layers, shunt and sweep low permeability layers, and GOBT emulsify and wash oil. CO2 partially dissolving in GOBT synergistically enhances the core water wettability, which improves GOBT injectability, emulsification, and stripping ability to residual oil.
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Affiliation(s)
- Longlong Chen
- State
Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
- Yanchang
Petroleum Group CO., Ltd., Xian, Shanxi 710075, China
| | - Xinwei Liao
- State
Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
| | - Shanfa Tang
- School
of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China
| | - Shuyun Feng
- School
of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China
| | - Ruijia Tang
- Yanchang
Petroleum Group CO., Ltd., Xian, Shanxi 710075, China
| | - Shaojing Jiang
- Yanchang
Petroleum Group CO., Ltd., Xian, Shanxi 710075, China
| | - Yuanwu Dong
- School
of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China
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22
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Fu W, Xu L, Yu Q, Fang J, Zhao G, Li Y, Pan C, Dong H, Wang D, Ren H, Guo Y, Liu Q, Liu J, Chen X. Artificial Intelligent Olfactory System for the Diagnosis of Parkinson's Disease. ACS Omega 2022; 7:4001-4010. [PMID: 35155895 PMCID: PMC8829950 DOI: 10.1021/acsomega.1c05060] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 01/11/2022] [Indexed: 06/01/2023]
Abstract
Background: Currently, Parkinson's disease (PD) diagnosis is mainly based on medical history and physical examination, and there is no objective and consistent basis. By the time of diagnosis, the disease would have progressed to the middle and late stages. Pilot studies have shown that a unique smell was present in the skin sebum of PD patients. This increases the possibility of a noninvasive diagnosis of PD using an odor profile. Methods: Fast gas chromatography (GC) combined with a surface acoustic wave sensor with embedded machine learning (ML) algorithms was proposed to establish an artificial intelligent olfactory (AIO) system for the diagnosis of Parkinson's through smell. Sebum samples of 43 PD patients and 44 healthy controls (HCs) from Fourth Affiliated Hospital of Zhejiang University School of Medicine, China, were smelled by the AIO system. Univariate and multivariate methods were used to identify the significant volatile organic compound (VOC) features in the chromatograms. ML algorithms, including support vector machine, random forest (RF), k nearest neighbor (KNN), AdaBoost (AB), and Naive Bayes (NB), were used to distinguish PD patients from HC based on the VOC peaks in the chromatograms of sebum samples. Results: VOC peaks with average retention times of 5.7, 6.0, and 10.6 s, respectively, corresponding to octanal, hexyl acetate, and perillic aldehyde, were significantly different in PD and HC. The accuracy of the classification based on the significant features was 70.8%. Based on the odor profile, the classification had the highest accuracy and F1 of the five models with 0.855 from NB and 0.846 from AB, respectively, in the process of model establishing. The highest specificity and sensitivity of the five classifiers were 91.6% from NB and 91.7% from RF and KNN, respectively, in the evaluating set. Conclusions: The proposed AIO system can be used to diagnose PD through the odor profile of sebum. Using the AIO system is helpful for the screening and diagnosis of PD and is conducive to further tracking and frequent monitoring of the PD treatment process.
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Affiliation(s)
- Wei Fu
- Department
of Biomedical Engineering, Key Laboratory of Biomedical Engineering
of Ministry of Education of China, Zhejiang
University, Hangzhou, Zhejiang 310027, China
| | - Linxin Xu
- Department
of Biomedical Engineering, Key Laboratory of Biomedical Engineering
of Ministry of Education of China, Zhejiang
University, Hangzhou, Zhejiang 310027, China
| | - Qiwen Yu
- Department
of Biomedical Engineering, Key Laboratory of Biomedical Engineering
of Ministry of Education of China, Zhejiang
University, Hangzhou, Zhejiang 310027, China
| | - Jiajia Fang
- Department
of Neurology, the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu City, Zhejiang Province 322000, P. R. China
| | - Guohua Zhao
- Department
of Neurology, the Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu City, Zhejiang Province 322000, P. R. China
| | - Yi Li
- Department
of Biomedical Engineering, Key Laboratory of Biomedical Engineering
of Ministry of Education of China, Zhejiang
University, Hangzhou, Zhejiang 310027, China
| | - Chenying Pan
- Department
of Biomedical Engineering, Key Laboratory of Biomedical Engineering
of Ministry of Education of China, Zhejiang
University, Hangzhou, Zhejiang 310027, China
| | - Hao Dong
- Research
Center for Intelligent Sensing, Zhejiang
Lab, Hangzhou 311100, China
| | - Di Wang
- Research
Center for Intelligent Sensing, Zhejiang
Lab, Hangzhou 311100, China
| | - Haiyan Ren
- Tianjin
University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Yi Guo
- Tianjin
University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Qingjun Liu
- Department
of Biomedical Engineering, Key Laboratory of Biomedical Engineering
of Ministry of Education of China, Zhejiang
University, Hangzhou, Zhejiang 310027, China
| | - Jun Liu
- Department
of Biomedical Engineering, Key Laboratory of Biomedical Engineering
of Ministry of Education of China, Zhejiang
University, Hangzhou, Zhejiang 310027, China
| | - Xing Chen
- Department
of Biomedical Engineering, Key Laboratory of Biomedical Engineering
of Ministry of Education of China, Zhejiang
University, Hangzhou, Zhejiang 310027, China
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23
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Tian Y, Ren Q, Chen X, Li L, Lan X. Yeast-Based Porous Carbon with Superior Electrochemical Properties. ACS Omega 2022; 7:654-660. [PMID: 35036731 PMCID: PMC8756604 DOI: 10.1021/acsomega.1c05278] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 12/14/2021] [Indexed: 05/09/2023]
Abstract
Biomass is a promising carbon source for supercapacitor electrode materials due to its abundant source, diversity, and low-cost. Yeast is an elliptic unicellular fungal organism that is widespread in nature. In this work, we used yeast as the carbon source and Na2SiO3 as the activator to prepare a honeycomb porous carbon with higher surface area. The yeast and Na2SiO3 were directly mixed and ground without any solvent, which is simple and characterized by large-scale application. The prepared porous carbon shows a good specific capacity of 313 F/g in 6 M KOH at a density of 0.5 A/g and an excellent rate capability of 85.9% from 0.5 to 10 A/g. The results suggest that the yeast-derived porous carbon may be a promising sustainable bio-material for the preparation of supercapacitor carbon electrode materials. This study provides an economical and practical avenue for yeast resource utilization and develops a simple approach to prepare porous carbon materials.
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Affiliation(s)
- Yuhong Tian
- School
of Chemistry and Chemical Engineering, Xi’an
University of Architecture and Technology, Xi’an 710055, China
| | - Qiaoxia Ren
- School
of Chemistry and Chemical Engineering, Xi’an
University of Architecture and Technology, Xi’an 710055, China
| | - Xiaoyu Chen
- School
of Chemistry and Chemical Engineering, Xi’an
University of Architecture and Technology, Xi’an 710055, China
| | - Linbo Li
- School
of Metallurgical Engineering, Xi’an
University of Architecture and Technology, Xi’an 710055, China
| | - Xinzhe Lan
- Research
Centre on Metallurgical Engineering and Technology of Shaanxi Province, Xi’an 710055, China
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24
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Zhang L, Zheng B, Gao Y, Wang L, Wang J, Duan X. Confined Water Vapor in ZIF-8 Nanopores. ACS Omega 2022; 7:64-69. [PMID: 35036679 PMCID: PMC8756436 DOI: 10.1021/acsomega.1c02953] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 12/08/2021] [Indexed: 06/09/2023]
Abstract
Metal-organic frameworks (MOFs) possess an ordered and size-controllable porous structure, making them an interesting heterogeneous confining environment for water. Herein, molecular dynamics simulations are employed to investigate the structure of confined water vapor in zeolitic imidazolate framework-8 (ZIF-8) nanopores. Water dimers, which are rarely observed in liquid or water vapor, can form in ZIF-8 at room temperature. The six-ring-member gate is the main location of a water dimer in ZIF-8. The terminal methyl and CH groups of the imidazole linker interact with the water dimer by relatively weak hydrogen bonding. The above-presented findings provide a foundation for the elucidation of water confined in ZIF-8 and demonstrate the potential of obtaining low-order clusters of water by MOFs.
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25
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Zhao X, Chang Y, Chen WJ, Wu Q, Pan X, Chen K, Weng B. Recent Progress in Pd-Based Nanocatalysts for Selective Hydrogenation. ACS Omega 2022; 7:17-31. [PMID: 35036674 PMCID: PMC8756445 DOI: 10.1021/acsomega.1c06244] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 12/09/2021] [Indexed: 06/14/2023]
Abstract
Selective hydrogenation plays an important role in the chemical industry and has a wide range of applications, including the production of fine chemicals and petrochemicals, pharmaceutical synthesis, healthcare product development, and the synthesis of agrochemicals. Pd-based catalysts have been widely applied for selective hydrogenation due to their unique electronic structure and ability to adsorb and activate hydrogen and unsaturated substrates. However, the exclusive and comprehensive summarization of the size, composition, and surface and interface effect of metal Pd on the performance for selective hydrogenation is still lacking. In this perspective, the research progress on selective hydrogenation using Pd-based catalysts is summarized. The strategies for improving the catalytic hydrogenation performance over Pd-based catalysts are investigated. Specifically, the effects of the size, composition, and surface and interfacial structure of Pd-based catalysts, which could influence the dissociation mode of hydrogen, the adsorption, and the reaction mode of the catalytic substrate, on the performance have been systemically reviewed. Then, the progress on Pd-based catalysts for selective hydrogenation of unsaturated alkynes, aldehydes, ketones, and nitroaromatic hydrocarbons is revealed based on the fundamental principles of selective hydrogenation. Finally, perspectives on the further development of strategies for chemical selective hydrogenation are provided. It is hoped that this perspective would provide an instructive guideline for constructing efficient heterogeneous Pd-based catalysts for various selective hydrogenation reactions.
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Affiliation(s)
- Xiaojing Zhao
- College
of Chemical Engineering and Materials, Quanzhou
Normal University, Quanzhou 362000, China
| | - Yandong Chang
- College
of Chemical Engineering and Materials, Quanzhou
Normal University, Quanzhou 362000, China
- College
of Materials Science and Engineering, Fuzhou
University, Fuzhou 350108, China
| | - Wen-Jie Chen
- College
of Chemical Engineering and Materials, Quanzhou
Normal University, Quanzhou 362000, China
| | - Qingshi Wu
- College
of Chemical Engineering and Materials, Quanzhou
Normal University, Quanzhou 362000, China
| | - Xiaoyang Pan
- College
of Chemical Engineering and Materials, Quanzhou
Normal University, Quanzhou 362000, China
| | - Kongfa Chen
- College
of Materials Science and Engineering, Fuzhou
University, Fuzhou 350108, China
| | - Bo Weng
- cMACS,
Department of Microbial and Molecular Systems, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
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26
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Wang YC, Luo ZS, Gao YQ, Kong YL. Modeling the Solubility of Sulfur in Sour Gas Mixtures Using Improved Support Vector Machine Methods. ACS Omega 2021; 6:32987-32999. [PMID: 34901650 PMCID: PMC8655918 DOI: 10.1021/acsomega.1c05032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 11/09/2021] [Indexed: 05/26/2023]
Abstract
The study of sulfur solubility is of great significance to the safe development of sulfur-containing gas reservoirs. However, due to measurement difficulties, experimental research data on sulfur solubility thus far are limited. Under the research background of small samples and poor information, a weighted least-squares support vector machine (WLSSVM)-based machine learning model suitable for a wide temperature and pressure range is proposed to improve the prediction accuracy of sulfur solubility in sour gas. First, we use the comprehensive gray relational analysis method to extract important factors affecting sulfur solubility as the model input parameters. Then, we use the whale optimization algorithm (WOA) and gray wolf optimizer (GWO) intelligence algorithms to find the optimal solution of the penalty factor and kernel coefficient and bring them into three common kernel functions. The optimal kernel function is calculated, and the final WOA-WLSSVM and GWO-WLSSVM models are established. Finally, four evaluation indicators and an outlier diagnostic method are introduced to test the proposed model's performance. The empirical results show that the WOA-WLSSVM model has better performance and reliability; the average absolute relative deviation is as low as 3.45%, determination coefficient (R 2) is as high as 0.9987, and the prediction accuracy is much higher than that of other models.
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27
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Xu N, Tao Y, Wang X, Luo Z. Construction of a Novel Substrate of Unfigured Islands-in-Sea Microfiber Synthetic Leather Based on Waste Collagen. ACS Omega 2021; 6:26086-26097. [PMID: 34660969 PMCID: PMC8515376 DOI: 10.1021/acsomega.1c03061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
This study is to introduce waste collagen into an unfigured islands-in-sea microfiber nonwoven material, replacing the polyurethane impregnation section of the traditional manufacturing process with the collagen impregnation process. The modified collagen was first impregnated in polyamide/low-density polyethylene (PA/LDPE) fiber nonwoven to form a film. Then the low-density polyethylene component was extracted and dissolved in toluene, resulting in a collagen-based microfiber nonwoven substrate. Waste collagen was first modified to introduce C=C into the molecular chain to obtain vinyl collagen (CMA), and then the following film formation conditions for CMA were studied: 73% degree of substitution (DS), 3 h cross-linking time, and 0.005-0.01 wt % initiator concentration. Then, the preparation of CMA-PA/LDPE and toluene extraction processes were investigated. The optimum toluene extraction conditions were obtained as an extraction temperature of 85 °C and an extraction time of 110 min. The properties of the nonwoven materials were compared before (CMA-PA/LDPE) and after (PA-CMA) extraction. It was found that the homogeneity, tensile strength, and static moisture permeability of the PA-CMA materials prepared by CMA with 50 and 73% DS were all superior to those of PA/LDPE. In particular, the static moisture permeability of PA-CMA (691.6 mg/10 cm2·24 h) increased by 36.2% compared to the microfiber synthetic leather substrate currently in the market. Using scanning electron microscopy (SEM), the continuity of a film of PA-CMA with 73% DS was observed to be better and the fibers were differentiated and relatively tighter fiber-to-fiber gap. The studied novel green process can eliminate the large amount of dimethylformamide (DMF) pollution caused by the current solvent-based polyurethane impregnation process.
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28
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Chen X, Shang X, Cheng Z, Liu Z, Chen X. Causes and Control Technology of Slurry Overflow in an Ammonia Desulfurization Tower. ACS Omega 2021; 6:25219-25226. [PMID: 34632181 PMCID: PMC8495689 DOI: 10.1021/acsomega.1c03007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Indexed: 06/13/2023]
Abstract
In the flue gas ammonia desulfurization process of the coal chemical industry, ammonium sulfate slurry in the desulfurization tower often foams and overflows, which wastes resources and pollutes the environment. The solution to this problem remains largely unknown. This paper aims to reveal the causes of foaming by analyzing foam composition, ammonia desulfurization process raw material source, and characteristics of the flue gas source of the coal chemical industries. It is seen that the organic carboxylate ammonium salt surfactant in the slurry was the main cause of ammonium sulfate slurry foaming. Moreover, due to ammonium sulfate crystals and ash in foam forming a skeleton to support the foaming structure, the foam was not easy to break. More importantly, an appropriate defoaming agent was screened and optimized by an ammonia desulfurization tower simulated device in the laboratory. The YLZ-3 compound defoaming agent, with the optimal defoaming efficiency, was obtained by combining a polyether siloxane copolymer, n-octyl alcohol, fumed silica, and deionized water. It had a good temperature stability and little influence on the ammonium sulfate slurry drying time. However, defoaming agent addition could affect the ammonium sulfate crystal form. The foam overflowing could be controlled by spraying the defoaming agent from the top of the tower. Thus, the problem of bubbling overflow of the ammonia desulfurization tower could be resolved very well.
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Affiliation(s)
- Xiaodong Chen
- College
of Chemistry and Chemical Engineering, Yulin
University, Yulin, Shaanxi 719000, P. R. China
- Shaanxi
Key Laboratory of Clean Utilization of Low-Metamorphic Coal, Yulin, Shaanxi 719000, P. R. China
| | - Xiaoqing Shang
- College
of Urban and Environmental Sciences, Northwest
University, Xi’an, Shaanxi 710127, P. R. China
| | - Zhiye Cheng
- College
of Chemistry and Chemical Engineering, Yulin
University, Yulin, Shaanxi 719000, P. R. China
- Shaanxi
Key Laboratory of Clean Utilization of Low-Metamorphic Coal, Yulin, Shaanxi 719000, P. R. China
| | - Zhe Liu
- College
of Chemistry and Chemical Engineering, Yulin
University, Yulin, Shaanxi 719000, P. R. China
- Shaanxi
Key Laboratory of Clean Utilization of Low-Metamorphic Coal, Yulin, Shaanxi 719000, P. R. China
| | - Xufei Chen
- School
of Food Science and Technology, Dalian Polytechnic
University, Dalian, Liaoning 116034, P. R. China
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29
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Xing Z, Zhao S, Guo W, Guo X. Geometric Feature Extraction of Point Cloud of Chemical Reactor Based on Dynamic Graph Convolution Neural Network. ACS Omega 2021; 6:21410-21424. [PMID: 34471744 PMCID: PMC8388001 DOI: 10.1021/acsomega.1c02213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 07/20/2021] [Indexed: 05/05/2023]
Abstract
Geometric features are an important factor for the classification of drugs and other transport objects in chemical reactors. The moving speed of drugs and other transport objects in chemical reactors is fast, and it is difficult to obtain their features by imaging and other methods. In order to avoid the mistaken and missed distribution of drugs and other objects, a method of extracting geometric features of the drug's point cloud in a chemical reactor based on a dynamic graph convolution neural network (DGCNN) is proposed. In this study, we first use MATLAB R2019a to add a random number of noise points in each point cloud file and label the point cloud. Second, k-nearest neighbor (KNN) is used to construct the adjacency relationship of all nodes, and the effect of DGCNN under different k values and the confusion matrix under the optimal k value are analyzed. Finally, we compare the effect of DGCNN with PointNet and PointNet++. The experimental results show that when k is 20, the accuracy, precision, recall, and F1 score of DGCNN are higher than those of other k values, while the training time is much shorter than that of k = 25, 30, and 35; in addition, the effect of DGCNN in extracting geometric features of the point cloud is better than that of PointNet and PointNet++. The results show that it is feasible to use DGCNN to analyze the geometric characteristics of drug point clouds in a chemical reactor. This study fills the gap of the end-to-end extraction method for a point cloud's corresponding geometric features without a data set. In addition, this study promotes the institutionalization, standardization, and intelligent design of safe production and management of drugs and other objects in the chemical reactor, and it has positive significance for the production cost and resource utilization of the whole pharmaceutical process. At the same time, it provides a new method for the intelligent processing of point cloud data.
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Affiliation(s)
- Zhizhong Xing
- College
of Mechanical Engineering, Xi’an
University of Science and Technology, Xi’an, Shaanxi 710054, China
| | - Shuanfeng Zhao
- College
of Mechanical Engineering, Xi’an
University of Science and Technology, Xi’an, Shaanxi 710054, China
| | - Wei Guo
- College
of Mechanical Engineering, Xi’an
University of Science and Technology, Xi’an, Shaanxi 710054, China
| | - Xiaojun Guo
- School
of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China
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30
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Zhao J, Wang P, Yang H, Tang F, Ju Y, Jia Y. Experimental Investigation of the CO 2 Huff and Puff Effect in Low-Permeability Sandstones with NMR. ACS Omega 2021; 6:15601-15607. [PMID: 34179604 PMCID: PMC8223224 DOI: 10.1021/acsomega.0c04250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 05/25/2021] [Indexed: 06/13/2023]
Abstract
For low-permeability sandstone reservoirs, CO2 huff and puff is an effective method for increasing oil recovery. Commonly, sandstone formations with low permeability have diverse pore and throat sizes and a complex pore-throat structure, which essentially affects the flow characteristics of CO2 and oil in the formation and further the CO2 huff and puff performance. It is necessary to understand the recovery degree of various microscale pore sizes under different operational parameters during CO2 huff and puff in tight sandstones. In this work, several experiments of cyclic CO2 injection are conducted with sandstone core samples with low permeability. Before and after the injection, the T 2 spectra of the sandstone cores are compared using the NMR technique. We then discuss the micro residual oil distribution and recovery degree in different pores, such as micropores (<1 ms), small pores (1-10 ms), medium pores (10-100 ms), and macropores (>100 ms). It is found that the recovery degree in the different pores increases as the pore size increases. Oil can be recovered more easily from macropores and medium pores during the cyclic CO2 injection. The oil contained in micropores is relatively difficult to extract considering a high capillary force under immiscible conditions. It is found that the total recovery degree increases with the increase in soaking time. However, such a recovery degree increment in small pores is not as large as that achieved in medium and large pores. With the CO2 injection volume increase, the total recovery degree increases. When the CO2 injection volume is less than 1.5 PV, it is challenging to extract the oil from micropores and small pores. As the cycle number increases, the cyclic oil recovery decreases, and most of the oil is produced in the first cycle. This suggests that under the experimental conditions of this study, the cycle number of CO2 huff and puff shall not be more than 3. This work is important to further understand the CO2 huff and puff process for improving oil recovery in sandstone reservoirs with low permeability.
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Affiliation(s)
- Jinsheng Zhao
- Shaanxi
Key Laboratory of Advanced Stimulation Technology for Oil & Gas
Reservoirs, Xi’an Shiyou University, Xi’an 710065, P. R. China
- School
of Petroleum Engineering, Xi’an Shiyou
University, Xi’an 710065, P. R. China
| | - Pengfei Wang
- Shaanxi
Key Laboratory of Advanced Stimulation Technology for Oil & Gas
Reservoirs, Xi’an Shiyou University, Xi’an 710065, P. R. China
- School
of Petroleum Engineering, Xi’an Shiyou
University, Xi’an 710065, P. R. China
| | - Haien Yang
- National
Engineering Laboratory of Low-Permeability Oil & Gas Exploration
and Development, PetroChina Changqing Oilfield
Company, Xi’an 710021, P. R. China
- Oil
and Gas Technology Research Institute, PetroChina Changqing Oilfield
Company, Xi’an 710021, P. R. China
| | - Fan Tang
- National
Engineering Laboratory of Low-Permeability Oil & Gas Exploration
and Development, PetroChina Changqing Oilfield
Company, Xi’an 710021, P. R. China
- Oil
and Gas Technology Research Institute, PetroChina Changqing Oilfield
Company, Xi’an 710021, P. R. China
| | - Yingjun Ju
- No.
6 Oil Production Plant, PetroChina Changqing Oilfield Company, Xi’an 710200, P. R. China
| | - Yuqin Jia
- National
Engineering Laboratory of Low-Permeability Oil & Gas Exploration
and Development, PetroChina Changqing Oilfield
Company, Xi’an 710021, P. R. China
- Oil
and Gas Technology Research Institute, PetroChina Changqing Oilfield
Company, Xi’an 710021, P. R. China
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31
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Wang J, Zhao X, Yu Q, Zhao C. Inverse Modeling of Thermal Decomposition of Flame-Retardant PET Fiber with Model-Free Coupled with Particle Swarm Optimization Algorithm. ACS Omega 2021; 6:13626-13636. [PMID: 34250328 PMCID: PMC8262458 DOI: 10.1021/acsomega.1c00599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 05/07/2021] [Indexed: 06/13/2023]
Abstract
The thermal decomposition model of flame-retardant polyethylene terephthalate (FRPET) fiber is essential for predicting its fire behavior and do relevant fire simulation. In this work, the thermal decomposition character of FRPET is investigated via thermogravimetric analysis at four heating rates. Two kinetic schemes are proposed based on the analysis of experimental data and model-free methods. The model-free methods (Friedman and advanced Vyazovkin methods) are employed to determine possible search range for particle swarm optimization algorithm with constriction factor (CFPSO). Thus, this coupled method could evaluate the kinetic parameters for two proposed schemes without initial guess. Both models could reasonably predict the experimental data with obtained parameters, and the second two-step consecutive model shows better performance. The performance of CFPSO on the second model is further compared with improved generalized simulated annealing algorithm, and CFPSO was found to be more effective. Furthermore, global sensitivity analysis was conducted via the Sobol method to investigate the influence of kinetic parameters for the second model on predicted results. The most influential parameters are ln A and E α of the second reaction and reaction order n of the third reaction.
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Affiliation(s)
- Junxiang Wang
- School
of Automobile, Chang’an University, Xi’an 710064, China
| | - Xuan Zhao
- School
of Automobile, Chang’an University, Xi’an 710064, China
| | - Qiang Yu
- School
of Automobile, Chang’an University, Xi’an 710064, China
| | - Chen Zhao
- China
Academy of Safety Science and Technology, Beijing 100012, China
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32
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Deng J, Chen W, Wang C, Wang W. Prediction Model for Coal Spontaneous Combustion Based on SA-SVM. ACS Omega 2021; 6:11307-11318. [PMID: 34056286 PMCID: PMC8153949 DOI: 10.1021/acsomega.1c00169] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 04/09/2021] [Indexed: 05/29/2023]
Abstract
Accurate predictions of the coal temperature in coal spontaneous combustion (CSC) are important for ensuring coal mine safety. Gas coal (the Zhaolou coal mine in Shandong Province, China) was used in this paper. A large CSC experimental device was adopted to obtain its characteristic temperatures from the macroscopic characteristics of gas production. A simulated annealing-support vector machine (SA-SVM) prediction model was proposed to reflect the complex nonlinear mapping between characteristic gases and the coal temperature. The risk degree of CSC was estimated in the time domain, and the model was verified by using in situ data from an actual working face. Furthermore, back-propagation neural network (BPNN) and single SVM methods were adopted for comparison. The results showed that the BPNN could not adapt to the small-sample problem due to overfitting and the output of a single SVM was unstable due to its strong dependence on the setting of hyperparameters. Through the SA global optimization process, the optimal combination of hyperparameters was obtained. Therefore, SA-SVM had higher prediction accuracy, robustness, and error tolerance rate and better environmental adaptability. These findings have certain practical significances for eliminating the hidden danger of CSC in the gob and providing timely warnings about potential danger.
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Affiliation(s)
- Jun Deng
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology, Xi’an 710054, P. R. China
- Shaanxi
Key Laboratory of Prevention and Control of Coal Fire, Xi’an 710054, P. R. China
| | - Weile Chen
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology, Xi’an 710054, P. R. China
- Shaanxi
Key Laboratory of Prevention and Control of Coal Fire, Xi’an 710054, P. R. China
| | - Caiping Wang
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology, Xi’an 710054, P. R. China
- Shaanxi
Key Laboratory of Prevention and Control of Coal Fire, Xi’an 710054, P. R. China
| | - Weifeng Wang
- School
of Safety Science and Engineering, Xi’an
University of Science and Technology, Xi’an 710054, P. R. China
- Shaanxi
Key Laboratory of Prevention and Control of Coal Fire, Xi’an 710054, P. R. China
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