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Kashyap T, Thakur R, Ngo GH, Lee D, Fekete G, Kumar R, Singh T. Silt erosion and cavitation impact on hydraulic turbines performance: An in-depth analysis and preventative strategies. Heliyon 2024; 10:e28998. [PMID: 38644884 PMCID: PMC11033088 DOI: 10.1016/j.heliyon.2024.e28998] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 03/26/2024] [Accepted: 03/27/2024] [Indexed: 04/23/2024] Open
Abstract
The primary issues in the Himalayan Rivers are sediment and cavitation degradation of the hydroelectric power turbine components. During the monsoon season, heavy material is transported by streams in hilly areas like the Himalayas through regular rainfalls, glacial and sub-glacial hydrological activity, and other factors. The severe erosion of hydraulic turbines caused by silt abrasion in these areas requires hydropower facilities to be regularly shut down for maintenance, affecting the plant's overall efficiency. This article provides an in-depth examination of the challenges that can lead to cavitation, silt erosion, and a decrease in the efficiency of various hydroelectric turbines, and it demands attention on the design, manufacture, operation, and maintenance of the turbines. This study's main objective is to critically evaluate earlier theoretical, experimental, and numerical evaluation-based studies (on cavitation and silt erosion) that are provided and addressed throughout the study. As a part of this study, various strategies for mitigating the effects of these problems and elongating the time that turbine may be utilized before they must be replaced have been provided.
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Affiliation(s)
- Tanish Kashyap
- Department of Mechanical Engineering, Shoolini University, Solan, 173229, India
| | - Robin Thakur
- Department of Mechanical Engineering, Shoolini University, Solan, 173229, India
| | - Gia Huy Ngo
- Department of Mechanical Engineering, Gachon University, Seongnam, 13120, South Korea
| | - Daeho Lee
- Department of Mechanical Engineering, Gachon University, Seongnam, 13120, South Korea
| | - Gusztáv Fekete
- Vehicle Industry Research Center, Széchenyi István University, H-9026, Győr, Hungary
| | - Raj Kumar
- Department of Mechanical Engineering, Gachon University, Seongnam, 13120, South Korea
| | - Tej Singh
- Savaria Institute of Technology, Faculty of Informatics, ELTE Eötvös Loránd University, Budapest, 1117, Hungary
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Luu HVL, Nguyen HH, Satyal P, Vo VH, Ngo GH, Pham VT, Setzer WN. Chemical Composition, Larvicidal and Molluscicidal Activity of Essential Oils of Six Guava Cultivars Grown in Vietnam. Plants (Basel) 2023; 12:2888. [PMID: 37571040 PMCID: PMC10421063 DOI: 10.3390/plants12152888] [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: 07/14/2023] [Revised: 07/27/2023] [Accepted: 08/01/2023] [Indexed: 08/13/2023]
Abstract
Diseases transmitted by mosquitoes and snails cause a large burden of disease in less developed countries, especially those with low-income levels. An approach to control vectors and intermediate hosts based on readily available essential oils, which are friendly to the environment and human health, may be an effective solution for disease control. Guava is a fruit tree grown on a large scale in many countries in the tropics, an area heavily affected by tropical diseases transmitted by mosquitoes and snails. Previous studies have reported that the extracted essential oils of guava cultivars have high yields, possess different chemotypes, and exhibit toxicity to different insect species. Therefore, this study was carried out with the aim of studying the chemical composition and pesticide activities of six cultivars of guava grown on a large scale in Vietnam. The essential oils were extracted by hydrodistillation using a Clevenger-type apparatus for 6 h. The components of the essential oils were determined using gas-chromatography-mass-spectrometry (GC-MS) analysis. Test methods for pesticide activities were performed in accordance with WHO guidelines and modifications. Essential oil samples from Vietnam fell into two composition-based clusters, one of (E)-β-caryophyllene and the other of limonene/(E)-β-caryophyllene. The essential oils PG03 and PG05 show promise as environmentally friendly pesticides when used to control Aedes mosquito larvae with values of 24 h LC50-aegypti of 0.96 and 0.40 µg/mL while 24 h LC50-albopictus of 0.50 and 0.42 µg/mL. These two essential oils showed selective toxicity against Aedes mosquito larvae and were safe against the non-target organism Anisops bouvieri. Other essential oils may be considered as molluscicides against Physa acuta (48 h LC50 of 4.10 to 5.00 µg/mL) and Indoplanorbis exustus (48 h LC50 of 3.85 to 7.71 µg/mL) and with less toxicity to A. bouvieri.
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Affiliation(s)
- Huynh Van Long Luu
- Institute of Applied Technology, Thu Dau Mot University, 06 Tran Van On, Thu Dau Mot City 820000, Vietnam;
| | - Huy Hung Nguyen
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam;
- Department of Pharmacy, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam;
| | - Prabodh Satyal
- Aromatic Plant Research Center, 230 N 1200 E, Suite 100, Lehi, UT 84043, USA; (P.S.); (W.N.S.)
| | - Van Hoa Vo
- Department of Pharmacy, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam;
| | - Gia Huy Ngo
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam;
| | - Van The Pham
- Laboratory of Ecology and Environmental Management, Science and Technology Advanced Institute, Van Lang University, Ho Chi Minh City 70000, Vietnam;
- Faculty of Applied Technology, School of Technology, Van Lang University, Ho Chi Minh City 70000, Vietnam
| | - William N. Setzer
- Aromatic Plant Research Center, 230 N 1200 E, Suite 100, Lehi, UT 84043, USA; (P.S.); (W.N.S.)
- Department of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USA
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Wu Y, Liu Y, Kamyab H, Manivasagan R, Rajamohan N, Ngo GH, Xia C. Physico-chemical and biological remediation techniques for the elimination of endocrine-disrupting hazardous chemicals. Environ Res 2023:116363. [PMID: 37295587 DOI: 10.1016/j.envres.2023.116363] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 05/27/2023] [Accepted: 06/07/2023] [Indexed: 06/12/2023]
Abstract
Due to their widespread occurrence and detrimental effects on human health and the environment, endocrine-disrupting hazardous chemicals (EDHCs) have become a significant concern. Therefore, numerous physicochemical and biological remediation techniques have been developed to eliminate EDHCs from various environmental matrices. This review paper aims to provide a comprehensive overview of the state-of-the-art remediation techniques for eliminating EDHCs. The physicochemical methods include adsorption, membrane filtration, photocatalysis, and advanced oxidation processes. The biological methods include biodegradation, phytoremediation, and microbial fuel cells. Each technique's effectiveness, advantages, limitations, and factors affecting their performance are discussed. The review also highlights recent developments and future perspectives in EDHCs remediation. This review provides valuable insights into selecting and optimizing remediation techniques for EDHCs in different environmental matrices.
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Affiliation(s)
- Yingji Wu
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China
| | - Yubo Liu
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China
| | - Hesam Kamyab
- Faculty of Architecture and Urbanism, UTE University, Calle Rumipamba S/N and Bourgeois, Quito, Ecuador; Department of Biomaterials, Saveetha Dental College and Hospital, Saveetha Institute of Medical and Technical Sciences, Chennai, 600 077, India; Malaysia-Japan International Institute of Technology Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100, Kuala Lumpur, Malaysia
| | - Rajasimman Manivasagan
- Department of Chemical Engineering, Annamalai University, Annamalai Nagar, 608002, India.
| | - Natarajan Rajamohan
- Chemical Engineering Section, Faculty of Engineering, Sohar University, Sohar, P C-311, Oman
| | - Gia Huy Ngo
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang, 550000, Viet Nam; Department of Pharmacy, Duy Tan University, 03 Quang Trung, Da Nang, 550000, Viet Nam
| | - Changlei Xia
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, Jiangsu, 210037, China.
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Luu-dam NA, Le CVC, Satyal P, Le TMH, Bui VH, Vo VH, Ngo GH, Bui TC, Nguyen HH, Setzer WN. Chemistry and Bioactivity of Croton Essential Oils: Literature Survey and Croton hirtus from Vietnam. Molecules 2023; 28:molecules28052361. [PMID: 36903605 PMCID: PMC10005233 DOI: 10.3390/molecules28052361] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 02/28/2023] [Accepted: 02/28/2023] [Indexed: 03/08/2023] Open
Abstract
Using essential oils to control vectors, intermediate hosts, and disease-causing microorganisms is a promising approach. The genus Croton in the family Euphorbiaceae is a large genus, with many species containing large amounts of essential oils, however, essential oil studies are limited in terms of the number of Croton species investigated. In this work, the aerial parts of C. hirtus growing wild in Vietnam were collected and analyzed by gas chromatography/mass spectrometry (GC/MS). A total of 141 compounds were identified in C. hirtus essential oil, in which sesquiterpenoids dominated, comprising 95.4%, including the main components β-caryophyllene (32.8%), germacrene D (11.6%), β-elemene (9.1%), α-humulene (8.5%), and caryophyllene oxide (5.0%). The essential oil of C. hirtus showed very strong biological activities against the larvae of four mosquito species with 24 h LC50 values in the range of 15.38-78.27 μg/mL, against Physella acuta adults with a 48 h LC50 value of 10.09 μg/mL, and against ATCC microorganisms with MIC values in the range of 8-16 μg/mL. In order to provide a comparison with previous works, a literature survey on the chemical composition, mosquito larvicidal, molluscicidal, antiparasitic, and antimicrobial activities of essential oils of Croton species was conducted. Seventy-two references (seventy articles and one book) out of a total of two hundred and forty-four references related to the chemical composition and bioactivity of essential oils of Croton species were used for this paper. The essential oils of some Croton species were characterized by their phenylpropanoid compounds. The experimental results of this research and the survey of the literature showed that Croton essential oils have the potential to be used to control mosquito-borne and mollusk-borne diseases, as well as microbial infections. Research on unstudied Croton species is needed to search for species with high essential oil contents and excellent biological activities.
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Affiliation(s)
- Ngoc Anh Luu-dam
- Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), No. 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100803, Vietnam
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, No. 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100803, Vietnam
| | - Canh Viet Cuong Le
- Mientrung Institute for Scientific Research, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), 321 Huynh Thuc Khang, Hue 530000, Thua Thien Hue, Vietnam
| | - Prabodh Satyal
- Aromatic Plant Research Center, 230 N 1200 E, Suite 100, Lehi, UT 84043, USA
| | - Thi Mai Hoa Le
- Faculty of Pharmacy, Vinh Medical University, 161 Nguyen Phong Sac, Vinh 461150, Vietnam
| | - Van Huong Bui
- Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), No. 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100803, Vietnam
- Vietnam Academy of Science and Technology (VAST), Graduate University of Science and Technology, No. 18 Hoang Quoc Viet Road, Cau Giay District, Hanoi 100803, Vietnam
| | - Van Hoa Vo
- Department of Pharmacy, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam
| | - Gia Huy Ngo
- Department of Pharmacy, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang 5000, Vietnam
| | - Thi Chinh Bui
- Faculty of Biology, University of Education, Hue University, 34 Le Loi St., Hue 530000, Vietnam
| | - Huy Hung Nguyen
- Department of Pharmacy, Duy Tan University, 03 Quang Trung, Da Nang 550000, Vietnam
- Center for Advanced Chemistry, Institute of Research and Development, Duy Tan University, 03 Quang Trung, Da Nang 5000, Vietnam
- Correspondence: ; Tel.: +84-967036828
| | - William N. Setzer
- Aromatic Plant Research Center, 230 N 1200 E, Suite 100, Lehi, UT 84043, USA
- Department of Chemistry, University of Alabama in Huntsville, Huntsville, AL 35899, USA
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Ngo GH, Pham VB, Nguyen NT. [Hemostasis before retropubic prostatic adenomectomy using temporary clamping of the vesicogenital arteries]. Prog Urol 1997; 7:126-7. [PMID: 9116730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Prostatectomy can be performed via several approaches, but the main problem concerns haemostasis before, during and after prostatectomy. A first series of 187 cases of retropubic prostatectomy was performed, between 1980 and 1989, by bilateral ligation of the genitovesical arteries, associated with suture-ligation of the periprostatic veins prior to prostatic resection. In a second series of 50 cases (1990-1992), the same technique was applied, but with temporary clamping instead of ligation of the 2 genitovesical arteries. This method of haemostasis allowed us to operate in a relatively bloodless field (blood loss less than 150 mL in 80% of cases), prevented immediate or secondary postoperative haemorrhages and simplified the postoperative surveillance.
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Affiliation(s)
- G H Ngo
- Hôpital Binh Dan, Ho Chi Minh Ville, Vietnam
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