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Radiation stability and in situ electrical stress healing of photodetection performance on α-In2Se3 based transistors 4

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Radiation stability and in situ electrical stress healing of...

4th International Conference on Radiation Effects of Electronic Devices, ICREED 2021

作者： Hou, Pengfei Wang, Xinhao Guo, Hongxia Ouyang, Xiaoping The State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Xi’an710024 China The School of Materials Science and Engineering Xiangtan University Hunan Xiangtan411105 China The Foshan Green Intelligent Manufacturing Research Institute of Xiangtan University Foshan528000 China

ISBN: (纸本)9781665441681

In this work, α-In2Se3 based transistors with channel widths of 20 μm have been irradiated with60Co γ-rays. The radiation induced photoresponsivity degradation, radiation stability, and time annealing effect on α-In2Se3 based transistor have been investigated. Both the radiation induced domain evolution and the time annealing effect decrease the photoresponsivity of α-In2Se3 based transistor. Phonon modes, domain structure, and surface topography of the α-In2Se3 nanoflakes have been investigated in details for revealing the mechanism of the photoresponsivity degradation. The results show that the surface topography damage of α-In2Se3 may be the main factor affecting the radiation stability in the time annealing. It is very interesting that the in-situ electric stress can heal the photoresponsivity decreased by the time annealing effect, because the captured free carriers can be freed by the voltage sweeping. Considering that the α-In2Se3 based transistors can still be used as photodetectors after an irradiation of 1 Mrad(Si) and a time annealing of one year, αIn2Se3 is promising for photodetector in extreme environmental conditions. © 2021 IEEE

关键词： Gamma rays

Quasiperiodic Symmetric Tilt FCC Grain Boundaries

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arXiv 2024年

作者： Zou, Wenwen Zhang, Juan Xu, Jie Jiang, Kai Hunan Key Laboratory for Computation and Simulation in Science and Engineering Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education School of Mathematics and Computational Science Xiangtan University Hunan Xiangtan411105 China LSEC NCMIS Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing China

In this work, we investigate [110] symmetric tilt FCC grain boundaries (GBs) by a recently developed approach for quasiperiodic interfaces using the Landau-Brazovskii model. On special tilt angles associated with quadratic algebraic numbers, quasiperiodic GBs exhibit generalized Fibonacci substitution rules. The transition mechanism from quasiperiodic GBs to periodic GBs is explored through sphere offsets and spectral coalescence. We also propose an accurate method to calculate the GB energy for arbitrary tilt angle and analyze the factors affecting the GB energy. The revealing GB energy change is continue along with tilt angle except periodic GBs. © 2024, CC BY-NC-SA.

关键词： Grain boundaries

Sinc-Chebyshev collocation method for a class of fractional diffusion-wave equations

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The Scientific World Journal

The Scientific World Journal 2014年第1期2014卷 143983页

作者： Mao, Zhi Xiao, Aiguo Yu, Zuguo Shi, Long Hunan Key Laboratory for Computation and Simulation in Science and Engineering Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education Xiangtan University Xiangtan Hunan 411105 China Mathematics and Information Engineering Department Tongren University Tongren Guizhou 554300 China

This paper is devoted to investigating the numerical solution for a class of fractional diffusion-wave equations with a variable coefficient where the fractional derivatives are described in the Caputo sense. The approach is based on the collocation technique where the shifted Chebyshev polynomials in time and the sinc functions in space are utilized, respectively. The problem is reduced to the solution of a system of linear algebraic equations. Through the numerical example, the procedure is tested and the efficiency of the proposed method is confirmed. © 2014 Zhi Mao et al.

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A system-of-systems architecture-driven modeling method for combat system effectiveness simulation 2

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A system-of-systems architecture-driven modeling method for ...

2nd Annual IEEE International Symposium on Systems engineering, ISSE 2016

作者： Li, Xiaobo Wang, Weiping Shu, Zhe Zhu, Ning He, Hua Liao, Tianjun College of Information Systems and Management National University of Defense Technology Changsha Hunan410073 China Department of Mathematics and Computer Science University of Antwerp Antwerp2020 Belgium State Key Laboratory of Complex System Simulation Beijing Institute of Systems Engineering Beijing China

ISBN: (纸本)9781509007936

Under the background of system-of-systems (SoS) counterwork, it is more apparent that the simulation modeling of the equipment should be domain-specific, formal, automatic and composable. Current equipment effectiveness simulation modeling approaches are mainly based on the methods and techniques from the modeling and simulation (M&S) community and software engineering community, and they are not capable to satisfy these four requirements systematically. Thus the systems engineering architecture model and domain knowledge should be used to support effectiveness simulation modeling more effectively. In this research, we propose an architecture-driven modeling method which conforms to the principle of architecture-driven development, uses ontology techniques to build equipment SoS architecture model and sub-domain ontology. This method performs architecture driven simulation modeling to realize the transformation from architecture models to simulation model frameworks;employs ontological metamodeling to design domain-specific modeling languages (DSML) based on the comprehensive usage of architecture models, sub-domain ontologies and M&S formalisms;integrates domain-specific simulation models from various domains using the model framework, and supports the composable development of simulation applications. © 2016 IEEE.

关键词： System of systems

FAS-UNet: A Novel FAS-driven Unet to Learn Variational Image Segmentation

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arXiv 2022年

作者： Zhu, Hui Shu, Shi Zhang, Jianping The School of Mathematics and Computational Science Xiangtan University Key Laboratory of Intelligent Computing & Information Processing Ministry of Education China The School of Mathematics and Computational Science Xiangtan University Hunan Key Laboratory for Computation and Simulation in Science and Engineering Xiangtan411105 China The School of Mathematics and Computational Science Xiangtan University Hunan National Applied Mathematics Center China

Solving variational image segmentation problems with hidden physics is often expensive and requires different algorithms and manually tunes model parameter. The deep learning methods based on the U-Net structure have obtained outstanding performances in many different medical image segmentation tasks, but designing such networks requires a lot of parameters and training data, not always available for practical problems. In this paper, inspired by traditional multi-phase convexity Mumford-Shah variational model and full approximation scheme (FAS) solving the nonlinear systems, we propose a novel variational-model-informed network (denoted as FAS-Unet) that exploits the model and algorithm priors to extract the multi-scale features. The proposed model-informed network integrates image data and mathematical models, and implements them through learning a few convolution kernels. Based on the variational theory and FAS algorithm, we first design a feature extraction sub-network (FAS-Solution module) to solve the model-driven nonlinear systems, where a skip-connection is employed to fuse the multi-scale features. Secondly, we further design a convolution block to fuse the extracted features from the previous stage, resulting in the final segmentation possibility. Experimental results on three different medical image segmentation tasks show that the proposed FAS-Unet is very competitive with other state-of-the-art methods in qualitative, quantitative and model complexity evaluations. Moreover, it may also be possible to train specialized network architectures that automatically satisfy some of the mathematical and physical laws in other image problems for better accuracy, faster training and improved generalization. The code is available at https://***/zhuhui100/FASUNet. Copyright © 2022, The Authors. All rights reserved.

关键词： Image segmentation

A C0-continuous nonconforming virtual element method for linear strain gradient elasticity

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arXiv 2024年

作者： Huang, Jianguo Yu, Yue School of Mathematical Sciences MOE-LSC Shanghai Jiao Tong University Shanghai200240 China Hunan Key Laboratory for Computation and Simulation in Science and Engineering Key Laboratory of Intelligent Computing and Information Processing of Ministry of Education National Center for Applied Mathematics in Hunan School of Mathematics and Computational Science Xiangtan University Hunan Xiangtan411105 China

A robust C0-continuous nonconforming virtual element method (VEM) is developed for a boundary value problem arising from strain gradient elasticity in two dimensions, with the family of polygonal meshes satisfying a very general geometric assumption given in Brezzi et al. (2009) and Chen and Huang (2018). The stability condition of the VEMs is derived by establishing Korn-type inequalities and inverse inequalities. Some crucial commutative relations for locking-free analysis as in elastic problems are derived. The sharp and uniform error estimates with respect to both the microscopic parameter and the Lamé coefficient are achieved in the lowest-order case, which is also verified by numerical *** Codes 65N12, 65N15, 65N22, 65N30 © 2024, CC BY-NC-ND.

关键词： Boundary value problems

Pattern Recognition of Nucleophilic Substitution Reaction Mechanism of Carboxylic Esters

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Pattern Recognition of Nucleophilic Substitution Reaction Me...

第十届全国物理有机化学学术会议

作者： Hua Yuan Shuli Weng Chenzhong Cao Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education Key Laboratory of QSAR/QSPR of Hunan Provincial University School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan 411201

Excited intramolecular proton transfer in 2-(2-Amino-3-Pyridyl) benzimidazole under the interaction with Cucurbituril macrocycle cavity

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Excited intramolecular proton transfer in 2-(2-Amino-3-Pyrid...

中国化学会第十六届全国化学热力学和热分析学术会议

作者： Xi-Chun Yang Xian-Yong Yu Jin Liu Xiao-Fang Li Ping-Gui Yi Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of Education Hunan Province College Key Laboratory of QSAR/QSPRSchool of Chemistry and Chemical EngineeringHunan University of Science and TechnologyXiangtan 411201

The interaction between 2-(2-Amino-3-Pyridyl)benzimidazole (2A3PyBI) and Cucurbit[6]uril (CB6) have been investigated in aqueous solution by using fluorescence and UV–Vis *** experiment was explored at four different selected pH environment which are pH=3.0,5.0,6.3 and *** results implies that 2A3PyBI has a dual emission fluorescence corresponding to the two proton transfer molecular structure (amimo and imino form) at the four selected pH *** blue emission band increase apparently but the red emission band changed weakly in the present of CB6 indicates that encapsulation into the CB6 macrocycle cavity retargets the deprotonation process of the excited-stated form,and hence reduce its subsequent conversion to the imino *** interaction ratio was found to be 1:1 by Benesi-Hildebrand method,and the maximum binding constant (Ka) was caculated to be 1.8×104 at pH=5.0 and the minimum binding constant to be 5×102 at pH=10.0,it indicates that the cationic form binds stronger with the CB6 macrocycle hydrophobic cavity than the neutral *** caculated nonpositive Gibbs free energy (ΔG) indicated the process of 2A3PyBI encapsulates into the CB6 macrocycle hydrophobic cavity is spontaneous.

关键词： 2-(2-Amino-3-Pyridyl)benzimidazole Cucurbit[6]uril Fluorescence spectroscopy UV-Visible spectroscopy proton transfer macrocycle hydrophobic

On the vanishing dissipation limit for the incompressible MHD equations on bounded domains

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arXiv 2020年

作者： Duan, Qin Xiao, Yuelong Xin, Zhouping Hunan Key Laboratory for Computation and Simulation in Science and Engineering School of Mathematics and Computational Science Xiangtan University China College of Mathematics and Statistics Shenzhen University China Institute of Mathematical Sciences Chinese University of Hong Kong Hong Kong

In this paper, we investigate the solvability, regularity and the vanishing dissipation limit of solutions to the three-dimensional viscous magneto-hydrodynamic (MHD) equations in bounded domains. On the boundary, the velocity field fulfills a Navier-slip condition, while the magnetic field satisfies the insulating condition. It is shown that the initial-boundary problem has a global weak solution for a general smooth domain. More importantly, for a flat domain, we establish the uniform local well-posedness of the strong solution with higher order uniform regularity and the asymptotic convergence with a rate to the solution of the ideal MHD as the dissipation tends to zero. Copyright © 2020, The Authors. All rights reserved.

关键词： Initial value problems