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Wang Y, Xia S, Cai R, Zhang J, Yu C, Cui J, Zhang Y, Wu J, Wu Y. Dynamic Reconstruction of Two-Dimensional Defective Bi Nanosheets for Efficient Electrocatalytic Urea Synthesis. Angew Chem Int Ed Engl 2024; 63:e202318589. [PMID: 38385612 DOI: 10.1002/anie.202318589] [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: 12/04/2023] [Revised: 02/01/2024] [Accepted: 02/20/2024] [Indexed: 02/23/2024]
Abstract
Catalyst surface dynamics drive the generation of active species for electrocatalytic reactions. Yet, the understanding of dominant site formation and reaction mechanisms is limited. In this study, we thoroughly investigate the dynamic reconstruction of two-dimensional defective Bi nanosheets from exfoliated Bi2Se3 nanosheets under electrochemical CO2 and nitrate (NO3 -) reduction conditions. The ultrathin Bi2Se3 nanosheets obtained by NaBH4-assisted cryo-mediated liquid-phase exfoliation are more easily reduced and reconstructed to Bi nanosheets with high-density grain boundaries (GBs; GB-rich Bi). The reconstructed GB-rich Bi catalyst affords a remarkable yield rate of 4.6 mmol h-1 mgcat. -1 and Faradaic efficiency of 32 % for urea production at -0.40 V vs. RHE. Notably, this yield rate is 2 and 8.2 times higher than those of the low-GB Bi and bulk Bi catalysts, respectively. Theoretical analysis demonstrates that the GB sites significantly reduce the *CO and *NH2 intermediate formation energy and C-N coupling energy barrier, enabling selective urea electrosynthesis on the GB-rich Bi catalyst. This work will trigger further research into the structure-activity interplay in dynamic processes using in situ techniques.
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Affiliation(s)
- Yan Wang
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
- Institute of Energy, Hefei Comprehensive National Science Center, Anhui Energy Laboratory), Hefei, 230009, China
| | - Shuai Xia
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Rui Cai
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Jianfang Zhang
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Cuiping Yu
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Jiewu Cui
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Yong Zhang
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
| | - Jingjie Wu
- Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH-45221, United States
| | - Yucheng Wu
- Department School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China
- China International S&T Cooperation Base for Advanced Energy and Environmental Materials & Anhui Provincial International S&T Cooperation Base for Advanced Energy Materials, Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei University of Technology, Hefei, 230009, China
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Hatzoglou C, Da Costa G, Wells P, Ren X, Geiser BP, Larson DJ, Demoulin R, Hunnestad K, Talbot E, Mazumder B, Meier D, Vurpillot F. Introducing a Dynamic Reconstruction Methodology for Multilayered Structures in Atom Probe Tomography. Microsc Microanal 2023; 29:1124-1136. [PMID: 37749700 DOI: 10.1093/micmic/ozad054] [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: 11/16/2022] [Revised: 03/08/2023] [Accepted: 04/18/2023] [Indexed: 09/27/2023]
Abstract
Atom probe tomography (APT) is a powerful three-dimensional nanoanalyzing microscopy technique considered key in modern materials science. However, progress in the spatial reconstruction of APT data has been rather limited since the first implementation of the protocol proposed by Bas et al. in 1995. This paper proposes a simple semianalytical approach to reconstruct multilayered structures, i.e., two or more different compounds stacked perpendicular to the analysis direction. Using a field evaporation model, the general dynamic evolution of parameters involved in the reconstruction of this type of structure is estimated. Some experimental reconstructions of different structures through the implementation of this method that dynamically accommodates variations in the tomographic reconstruction parameters are presented. It is shown both experimentally and theoretically that the depth accuracy of reconstructed APT images is improved using this method. The method requires few parameters in order to be easily usable and substantially improves atom probe tomographic reconstructions of multilayered structures.
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Affiliation(s)
- Constantinos Hatzoglou
- INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Rouen F-76000, France
- Department of Materials Science and Engineering, NTNU, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Gérald Da Costa
- INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Rouen F-76000, France
| | | | | | - Brian P Geiser
- CAMECA Instruments Inc., 5470 Nobel Dr., Madison, WI 53711, USA
| | - David J Larson
- CAMECA Instruments Inc., 5470 Nobel Dr., Madison, WI 53711, USA
| | - Remi Demoulin
- INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Rouen F-76000, France
| | - Kasper Hunnestad
- Department of Materials Science and Engineering, NTNU, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Etienne Talbot
- INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Rouen F-76000, France
| | - Baishakhi Mazumder
- Department of Material Design and Innovation, University at Buffalo, Buffalo, NY 14260, USA
| | - Dennis Meier
- Department of Materials Science and Engineering, NTNU, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - François Vurpillot
- INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Groupe de Physique des Matériaux UMR 6634, Rouen F-76000, France
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Park BS, Lee S, Park JT, Kim JK, Kim W, Seo YH. Dynamic Reconstruction and Mesh Compression of 4D Volumetric Model Using Correspondence-Based Deformation for Streaming Service. Sensors (Basel) 2022; 22:8815. [PMID: 36433412 PMCID: PMC9693839 DOI: 10.3390/s22228815] [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] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/09/2022] [Accepted: 11/10/2022] [Indexed: 06/16/2023]
Abstract
A sequence of 3D models generated using volumetric capture has the advantage of retaining the characteristics of dynamic objects and scenes. However, in volumetric data, since 3D mesh and texture are synthesized for every frame, the mesh of every frame has a different shape, and the brightness and color quality of the texture is various. This paper proposes an algorithm to consistently create a mesh of 4D volumetric data using dynamic reconstruction. The proposed algorithm comprises remeshing, correspondence searching, and target frame reconstruction by key frame deformation. We make non-rigid deformation possible by applying the surface deformation method of the key frame. Finally, we propose a method of compressing the target frame using the target frame reconstructed using the key frame with error rates of up to 98.88% and at least 20.39% compared to previous studies. The experimental results show the proposed method's effectiveness by measuring the geometric error between the deformed key frame and the target frame. Further, by calculating the residual between two frames, the ratio of data transmitted is measured to show a compression performance of 18.48%.
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Barreto MA, Perez-Gonzalez J, Herr HM, Huegel JC. ARACAM: A RGB-D Multi-View Photogrammetry System for Lower Limb 3D Reconstruction Applications. Sensors (Basel) 2022; 22:s22072443. [PMID: 35408058 PMCID: PMC9003530 DOI: 10.3390/s22072443] [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] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/01/2022] [Accepted: 03/11/2022] [Indexed: 12/19/2022]
Abstract
In the world, there is a growing need for lower limb prostheses due to a rising number of amputations caused primarily, by diabetic foot. Researchers enable functional and comfortable prostheses through prosthetic design by integrating new technologies applied to the traditional handcrafted method for prosthesis fabrication that is still current. That is why computer vision shows to be a promising tool for the integration of 3D reconstruction that may be useful for prosthetic design. This work has the objective to design, prototype, and test a functional system to scan plaster cast molds, which may serve as a platform for future technologies for lower limb reconstruction applications. The image capture system comprises 5 stereoscopic color and depth cameras, each with 4 DOF mountings on an enveloping frame, as well as algorithms for calibration, segmentation, registration, and surface reconstruction. The segmentation metrics of dice coefficient and Hausdorff distance (HD) show strong visual similarity with an average similarity of 87% and average error of 6.40 mm, respectively. Moving forward, the system was tested on a known 3D printed model obtained from a computer tomography scan to which comparison results via HD show an average error of ≤1.93 mm thereby making the system competitive against the systems reviewed from the state-of-the-art.
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Affiliation(s)
- Marco A. Barreto
- Tecnologico de Monterrey, Escuela de Ingenieria y Ciencias, Av. General Ramon Corona 2514, Zapopan 45138, Mexico; (M.A.B.); (J.C.H.)
| | - Jorge Perez-Gonzalez
- Unidad Académica del Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas, Universidad Nacional Autónoma de México, Parque Científico Tecnológico de Yucatán, Km 5.5 Carretera Sierra Papacal-Chuburna, Mérida 97302, Mexico
- Correspondence:
| | - Hugh M. Herr
- Lisa K Yang Center for Bionics, Massachusetts Institute of Technology, Cambridge, MA 02142-1308, USA;
| | - Joel C. Huegel
- Tecnologico de Monterrey, Escuela de Ingenieria y Ciencias, Av. General Ramon Corona 2514, Zapopan 45138, Mexico; (M.A.B.); (J.C.H.)
- Lisa K Yang Center for Bionics, Massachusetts Institute of Technology, Cambridge, MA 02142-1308, USA;
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Chalampalakis Z, Stute S, Filipović M, Sureau F, Comtat C. Use of dynamic reconstruction for parametric Patlak imaging in dynamic whole body PET. Phys Med Biol 2021; 66. [PMID: 34433155 DOI: 10.1088/1361-6560/ac2128] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 08/25/2021] [Indexed: 11/11/2022]
Abstract
Dynamic whole body (DWB) PET acquisition protocols enable the use of whole body parametric imaging for clinical applications. In FDG imaging, accurate parametric images of PatlakKican be complementary to regular standardised uptake value images and improve on current applications or enable new ones. In this study we consider DWB protocols implemented on clinical scanners with a limited axial field of view with the use of multiple whole body sweeps. These protocols result in temporal gaps in the dynamic data which produce noisier and potentially more biased parametric images, compared to single bed (SB) dynamic protocols. Dynamic reconstruction using the Patlak model has been previously proposed to overcome these limits and shown improved DWB parametric images ofKi. In this work, we propose and make use of a spectral analysis based model for dynamic reconstruction and parametric imaging of PatlakKi. Both dynamic reconstruction methods were evaluated for DWB FDG protocols and compared against 3D reconstruction based parametric imaging from SB dynamic protocols. This work was conducted on simulated data and results were tested against real FDG dynamic data. We showed that dynamic reconstruction can achieve levels of parametric image noise and bias comparable to 3D reconstruction in SB dynamic studies, with the spectral model offering additional flexibility and further reduction of image noise. Comparisons were also made between step and shoot and continuous bed motion (CBM) protocols, which showed that CBM can achieve lower parametric image noise due to reduced acquisition temporal gaps. Finally, our results showed that dynamic reconstruction improved VOI parametric mean estimates but did not result to fully converged values before resulting in undesirable levels of noise. Additional regularisation methods need to be considered for DWB protocols to ensure both accurate quantification and acceptable noise levels for clinical applications.
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Affiliation(s)
- Zacharias Chalampalakis
- Laboratoire d'Imagerie Biomédicale Multimodale (BioMaps), Université Paris-Saclay, CEA, CNRS, Inserm, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Simon Stute
- Nuclear Medicine Department, Nantes University Hospital, Nantes, France.,CRCINA, Inserm, CNRS, Université d'Angers, Université de Nantes, France
| | - Marina Filipović
- Laboratoire d'Imagerie Biomédicale Multimodale (BioMaps), Université Paris-Saclay, CEA, CNRS, Inserm, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Florent Sureau
- Laboratoire d'Imagerie Biomédicale Multimodale (BioMaps), Université Paris-Saclay, CEA, CNRS, Inserm, Service Hospitalier Frédéric Joliot, Orsay, France
| | - Claude Comtat
- Laboratoire d'Imagerie Biomédicale Multimodale (BioMaps), Université Paris-Saclay, CEA, CNRS, Inserm, Service Hospitalier Frédéric Joliot, Orsay, France
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Matilla-García M, Morales I, Rodríguez JM, Ruiz Marín M. Selection of Embedding Dimension and Delay Time in Phase Space Reconstruction via Symbolic Dynamics. Entropy (Basel) 2021; 23:e23020221. [PMID: 33670103 PMCID: PMC7916852 DOI: 10.3390/e23020221] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 02/04/2021] [Accepted: 02/08/2021] [Indexed: 12/03/2022]
Abstract
The modeling and prediction of chaotic time series require proper reconstruction of the state space from the available data in order to successfully estimate invariant properties of the embedded attractor. Thus, one must choose appropriate time delay τ∗ and embedding dimension p for phase space reconstruction. The value of τ∗ can be estimated from the Mutual Information, but this method is rather cumbersome computationally. Additionally, some researchers have recommended that τ∗ should be chosen to be dependent on the embedding dimension p by means of an appropriate value for the time delay τw=(p−1)τ∗, which is the optimal time delay for independence of the time series. The C-C method, based on Correlation Integral, is a method simpler than Mutual Information and has been proposed to select optimally τw and τ∗. In this paper, we suggest a simple method for estimating τ∗ and τw based on symbolic analysis and symbolic entropy. As in the C-C method, τ∗ is estimated as the first local optimal time delay and τw as the time delay for independence of the time series. The method is applied to several chaotic time series that are the base of comparison for several techniques. The numerical simulations for these systems verify that the proposed symbolic-based method is useful for practitioners and, according to the studied models, has a better performance than the C-C method for the choice of the time delay and embedding dimension. In addition, the method is applied to EEG data in order to study and compare some dynamic characteristics of brain activity under epileptic episodes
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Affiliation(s)
- Mariano Matilla-García
- Facultad de Economicas y Empresariales, Universidad Nacional de Educación a Distancia (UNED), 28050 Madrid, Spain
- Correspondence:
| | | | - Jose Miguel Rodríguez
- Departamento Metodos Cuantitativos, Ciencias Juridicas y Lenguas Modernas, Universidad Politecnica de Cartagena, 30201 Cartagena, Spain; (J.M.R.); (M.R.M.)
| | - Manuel Ruiz Marín
- Departamento Metodos Cuantitativos, Ciencias Juridicas y Lenguas Modernas, Universidad Politecnica de Cartagena, 30201 Cartagena, Spain; (J.M.R.); (M.R.M.)
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Shin YB, Ju YH, Lee HJ, Han CJ, Lee CR, Kim Y, Kim JW. Self-Integratable, Healable, and Stretchable Electroluminescent Device Fabricated via Dynamic Urea Bonds Equipped in Polyurethane. ACS Appl Mater Interfaces 2020; 12:10949-10958. [PMID: 32053751 DOI: 10.1021/acsami.9b21789] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Reversible bonding between polymer chains has been used primarily to induce self-healing of damaged polymers. Inspired by the dynamic nature of such bonding, we have developed a polyurethane equipped with dynamic urea bonds (PEDUB) that has high strength sufficient to make it be freestanding and have a healing capability and self-bonding property. This allowed subsequent heterogeneous multicomponent device integration of electrodes/substrate and light-emitting pixels into a light-emitting device. We first used the PEDUB to individually fabricate a highly stretchable electrode containing Ag nanowires and stretchable composites with ZnS-based particles. They were successfully assembled into a stretchable, waterproof electroluminescent (EL) device even under mild conditions (60 °C for 10 min) owing to the reversible exchange of urea bonds and low glass transition temperature of PEDUB. The assembled device with an AC-driven EL architecture retained excellent EL characteristics even after stretching, submersion in water, and cutting owing to the robust solid-state bonding interfaces induced by the dynamic urea bonds. Consequently, various shapes of the illuminating elastomer and an illuminated picture were realized for the first time using the mosaic-like assembly method. This first demonstration of multicomponent assembly paves the way for future stretchable multifunctional devices.
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Affiliation(s)
- Yoo Bin Shin
- School of Advanced Materials Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Republic of Korea
| | - Yun Hee Ju
- School of Advanced Materials Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Republic of Korea
| | - Hee-Jin Lee
- Display Research Center, Korea Electronics Technology Institute, Seongnam 13509, Republic of Korea
| | - Chul Jong Han
- Display Research Center, Korea Electronics Technology Institute, Seongnam 13509, Republic of Korea
| | - Cheul-Ro Lee
- School of Advanced Materials Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Republic of Korea
| | - Youngmin Kim
- Display Research Center, Korea Electronics Technology Institute, Seongnam 13509, Republic of Korea
| | - Jong-Woong Kim
- School of Advanced Materials Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju 54896, Republic of Korea
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Motomura H, Iguchi H, Hatano T, Kobayashi R, Sakahara D, Fujii N, Mineo M. Dynamic eye socket reconstruction after extensive resection of midfacial malignancies: preliminary results using temporalis transfer. Acta Otolaryngol 2014; 134:1205-10. [PMID: 25315921 DOI: 10.3109/00016489.2014.940555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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] [Indexed: 11/13/2022]
Abstract
The functional and esthetic results of reconstructive surgery after extended total maxillectomy or extended orbital exenteration greatly depend on the quality of the orbital reconstruction. We developed dynamic eye socket reconstruction using temporalis transfer to achieve good orbital reconstruction, and examined the usefulness of our technique. Five patients (three men and two women, aged 44-72 years) who underwent extensive resection of midfacial malignancies were treated with dynamic eye socket reconstruction using temporalis transfer. In most cases, eye socket reconstruction was performed approximately 1 year after the initial surgery, and temporalis transfer was used after maturation of the eye socket. The follow-up period ranged from 16 to 120 months (average 63.8 months). Movement of the upper and lower eyelids was achieved in all cases, and definite creases at the lateral canthus were observed in two patients. A good shape in the reconstructed medial and lateral canthal areas was maintained in all patients. Our reconstruction technique is extremely effective in creating natural creases ('crow's feet') at the lateral canthus during smiling, enabling movement of the upper and lower eyelids, and maintaining a sharp palpebral morphology.
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Affiliation(s)
- Hisashi Motomura
- Department of Plastic and Reconstructive Surgery, Osaka City University Graduate School of Medicine , Osaka , Japan
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