检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Luo, Zheng Feng, Ming Gao, Zijian Yu, Jinyang Hu, Liang Wang, Tao Xue, Shenao Zhou, Shen Ouyang, Fangping Feng, Dawei Xu, Kele Wang, Shanshan Department of Materials Hunan Key Laboratory of Mechanism and Technology of Quantum Information College of Aerospace Science and Engineering National University of Defense Technology Changsha410000 China School of Computer State Key Laboratory of Complex & Critical Software Environment National University of Defense Technology Changsha410000 China College of Electronic and Information Engineering Tongji University Shanghai201804 China School of Material Science and Engineering Peking University Beijing100871 China School of Physics Central South University Changsha410083 China College of Science National University of Defense Technology Changsha410000 China School of Advanced Materials Peking University Shenzhen Graduate School Guangdong Shenzhen518055 China

The emergence of deep learning (DL) has provided great opportunities for the high-throughput analysis of atomic-resolution micrographs. However, the DL models trained by image patches in fixed size generally lack efficiency and flexibility when processing micrographs containing diversified atomic configurations. Herein, inspired by the similarity between the atomic structures and graphs, we describe a few-shot learning framework based on an equivariant graph neural network (EGNN) to analyze a library of atomic structures (e.g., vacancies, phases, grain boundaries, doping, etc.), showing significantly promoted robustness and three orders of magnitude reduced computing parameters compared to the image-driven DL models, which is especially evident for those aggregated vacancy lines with flexible lattice distortion. Besides, the intuitiveness of graphs enables quantitative and straightforward extraction of the atomic-scale structural features in batches, thus statistically unveiling the self-assembly dynamics of vacancy lines under electron beam irradiation. A versatile model toolkit is established by integrating EGNN sub-models for single structure recognition to process images involving varied configurations in the form of a task chain, leading to the discovery of novel doping configurations with superior electrocatalytic properties for hydrogen evolution reactions. This work provides a powerful tool to explore structure diversity in a fast, accurate, and intelligent manner. Copyright © 2024, The Authors. All rights reserved.

关键词： Grain boundaries

来源：评论

学校读者我要写书评

暂无评论

Ab Initio DFT Perspective on Triclinic Bi2CrO6: Energy Material for Optoelectronic, Thermoelectric, and Photocatalytic Applications

引用

The Journal of Physical Chemistry C 2025年第25期129卷 11732-11745页

作者： Shahad Saroar Shadmin Sultana Quazi Shafayat Hossain Sadiq Shahriyar Nishat Imran Hossain Sabuj Shirin Akter Jahan M. N. I. Khan Umme Sarmeen Akhtar Muhammad Shahriar Bashar Dipa Islam Md. Zakir Sultan Sharmin Jahan Khandker Saadat Hossain Imtiaz Ahmed Materials Science Research Laboratory Department of Electrical and Electronic Engineering University of Dhaka Dhaka1000 Bangladesh Department of Materials Science and Engineering Rensselaer Polytechnic Institute Troy New York 12180 United States Institute of Glass and Ceramic Research and Testing Bangladesh Council of Scientific and Industrial Research Dhaka1205 Bangladesh Materials Science Division Atomic Energy Centre Dhaka1000 Bangladesh Institute of Energy Research and Development Bangladesh Council of Scientific and Industrial Research Dhaka1205 Bangladesh Biomedical and Toxicological Research Institute Bangladesh Council of Scientific and Industrial Research Dhaka1205 Bangladesh Centre for Advanced Research in Sciences University of Dhaka Dhaka1000 Bangladesh Institute of Food Science and Technology Bangladesh Council of Scientific and Industrial Research Dhaka1205 Bangladesh Nanophysics and Soft Matter Laboratory Department of Physics University of Dhaka Dhaka1000 Bangladesh

Here we report comprehensive theoretical modeling of hydrothermally stabilizedP1̅ bismuth chromate (Bi2CrO6). The desired crystallographic-elastic properties correlation, dynamical stability, and infrared and Raman absorptions of triclinic Bi2CrO6were corroborated from the equation of state, elastic tensor, phonon density of states and band structures, and Raman tensor simulations, respectively. The sophisticated tuned hybrid functional in the presence of spin–orbit coupling reliably reproduced the diffuse reflectance spectroscopy-derived ∼2.19 eV direct electronic band gap of triclinic Bi2CrO6along with its broad absorption range of ∼620 nm. Its average electron and hole effective masses turned out to be ∼4.27 and ∼2.40 times larger than the bare electron mass, respectively. The predicted dimensionless thermoelectric figure of meritZT≈ 0.37 at 600 K for triclinic Bi2CrO6is on par with that of well-knownn-type thermoelectric materials like SrTO3and BaBi2O6. The steady-state photoluminescence emission of triclinic Bi2CrO6occurred at 460, 468, 490, and 572 nm in the visible spectrum. The theoretical electronic band edge positions and reaction potential analysis supported the experimentally observed photocatalytic degradation of methylene blue and rhodamine B dyes. In summary, the results presented here may have validated the potential of triclinic Bi2CrO6in optoelectronic, thermoelectric, and photocatalytic applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Ion irradiation induced crystalline disorder accelerates interfacial phonon conversion and reduces thermal boundary resistance

引用

Physical Review B 2024年第16期109卷 165421-165421页

作者： Thomas W. Pfeifer Henry Aller Eric R. Hoglund Ethan A. Scott John A. Tomko Habib Ahmad Alan Doolittle Ashutosh Giri Khalid Hattar Alan J. H. McGaughey Patrick E. Hopkins Department of Mechanical and Aerospace Engineering University of Virginia Charlottesville Virginia 22904 USA Department of Mechanical Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA Department of Materials Science and Engineering University of Virginia Charlottesville Virginia 22904 USA Sandia National Laboratories Albuquerque New Mexico 87185 USA School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA Center for Advanced Electronics & Photovoltaic Engineering IIUI Islamabad Department of Mechanical Industrial and Systems Engineering University of Rhode Island Kingston Rhode Island 02881 USA Department of Nuclear Engineering University of Tennessee Knoxville Tennessee 37996 USA Department of Physics University of Virginia Charlottesville Virginia 22904 USA

Traditional understanding of the thermal boundary resistance (TBR) across solid-solid interfaces posits that the vibrational densities of states overlap between materials dictates interfacial energy transport, with phonon scattering occurring at the interface. Using atomistic simulations, we show a mechanism for control of TBR; point defects near an interface can lead to both short- and midrange disorder, accelerating the conversion of vibrational energy between bulk and interfacial modes, ultimately reducing the TBR. We experimentally demonstrate this reduction through ion irradiation of gallium nitride and subsequently measuring the TBR across Al/GaN interfaces.

关键词： Crystal defects Defects Irradiation effects Lattice dynamics Phonons Thermal boundary conductance Vibrational states Interfaces Semiconductor compounds Transducers Ion implantation Molecular dynamics Thermoreflectance

来源：评论

学校读者我要写书评

暂无评论

Fractional Marcus-Hush-Chidsey-Yakopcic current-voltage model for redox-based resistive memory devices

arXiv

引用

arXiv 2023年

作者： Paradezhenko, Georgii V. Prodan, Dmitrii V. Pervishko, Anastasiia A. Yudin, Dmitry Allagui, Anis Skolkovo Institute of Science and Technology Moscow121205 Russia Institute of High Technologies and Advanced Materials Far Eastern Federal University Vladivostok690922 Russia Department of Sustainable and Renewable Energy Engineering University of Sharjah P.O. Box Sharjah27272 United Arab Emirates Department of Mechanical and Materials Engineering Florida International University MiamiFL33174 United States

We propose a circuit-level model combining the Marcus-Hush-Chidsey electron current equation and the Yakopcic equation for the state variable for describing resistive switching memory devices of the structure metal-ionic conductor-metal. We extend the dynamics of the state variable originally described by a first-order time derivative by introducing a fractional derivative with an arbitrary order between zero and one. We show that the extended model fits with great fidelity the current-voltage characteristic data obtained on a Si electrochemical metallization memory device with Ag-Cu alloy. Copyright © 2023, The Authors. All rights reserved.

关键词： Current voltage characteristics

来源：评论

学校读者我要写书评

暂无评论

Mechanical Properties and Hydration Characteristics of Cement Composites with High-Volume Blast Furnace Slag by Wet Milling Activation

SSRN

引用

SSRN 2022年

作者： Zhang, Qian Liu, Bo Xiao, Kui Ekberg, Christian Zhang, Shengen Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China Nuclear Chemistry and Industrial Material Recycling Department of Chemistry and Chemical Engineering Chalmers University of Technology Gothenburg41296 Sweden

Replacement part of cement clinker by blast furnace slag (BFS) reduces the use of cement while recycling slags and achieving low CO2 emissions. The activity of BFS decides the basic performances of BFS-cement composites (BFS-CC). In this study, the processes of wet milling in water (WM-W) and ethanol (WM-E) were used to promote the activity of BFS, respectively. Using 50% activated BFS as the admixture, two series of BFS-CC samples were prepared (i.e., BFS-CC-W and BFS-CC-E). The effects of wet milling on the activity of BFS and the properties of BFS-CC samples were investigated comparatively. The results showed that BFS after WM-W showed smaller particle sizes and greater hydration degree than BFS after WM-E. Under optimal conditions, the compressive strengths of BFS-CC-W and BFS-CC-E after curing 28 days could reach 68.9% and 90.4% of that of control cement specimens, respectively. Results highlight that WM-E of BFS provided an effective and convenient way to improve the compressive strength of high-volume BFS-CC. © 2022, The Authors. All rights reserved.

关键词： Slags

来源：评论

学校读者我要写书评

暂无评论

Direct Measurement of Acoustic Spectral Density and Fractional Topological Charge

引用

Physical Review Applied 2023年第3期19卷 034073-034073页

作者： Hao Ge Zi-Wei Long Xiang-Yuan Xu Jin-Guo Hua Yang Liu Bi-Ye Xie Jian-Hua Jiang Ming-Hui Lu Yan-Feng Chen National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering Nanjing University Nanjing Jiangsu 210093 China Institute of Theoretical and Applied Physics School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University 1 Shizi Street Suzhou 215006 China Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Laboratory of Modern Optical Technologies of Ministry of Education Soochow University Suzhou 215006 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen 518172 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing Jiangsu 210093 China

LDOS is a fundamental spectral property that plays a central role in various physical phenomena, such as wave-matter interactions and spontaneous emissions. The role of LDOS in acoustics was uncovered only in recent years and the measurement of acoustic LDOS has not yet been achieved. Here, we report on the direct measurement of the LDOS in acoustic systems. The acoustic LDOS is quantified here through the measurement of the volume flow rate and the acoustic pressure with a local excitation-probe configuration. Based on this method, we detect the LDOS in the one-dimensional acoustic Su-Schrieffer-Heeger model and observe the fractional topological charge of the system. Our work unveils the role of the LDOS in acoustic phenomena and paves the way toward characterizing and tailoring the LDOS in acoustic systems, which holds promise for applications in acoustic emission control, energy localization, and wave-matter interaction.

关键词： Acoustic metamaterials Acoustic wave phenomena Density of states Metrology Spontaneous emission Topological phases of matter Acoustic techniques Particle image velocimetry

来源：评论

学校读者我要写书评

暂无评论

Demonstration of a Bosonic Quantum Classifier with Data Reuploading

引用

Physical Review Letters 2023年第1期131卷 013601-013601页

作者： Takafumi Ono Wojciech Roga Kentaro Wakui Mikio Fujiwara Shigehito Miki Hirotaka Terai Masahiro Takeoka Program in Advanced Materials Science Faculty of Engineering and Design Kagawa University 2217-20 Hayashi-cho Takamatsu Kagawa 761-0396 Japan JST PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan Department of Electronics and Electrical Engineering Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama 223-8522 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology (NICT) Koganei Tokyo 184-8795 Japan Advanced ICT Research Institute National Institute of Information and Communications Technology 588-2 Iwaoka Nishi Kobe 651-2492 Japan

In a single qubit system, a universal quantum classifier can be realized using the data reuploading technique. In this study, we propose a new quantum classifier applying this technique to bosonic systems and successfully demonstrate it using a silicon-based photonic integrated circuit. We established a theory of quantum machine learning algorithm applicable to bosonic systems and implemented a programmable optical circuit combined with an interferometer. Learning and classification using part of the implemented optical quantum circuit with uncorrelated two photons resulted in a classification with a success probability of 94±0.8% in the proof of principle experiment. As this method can be applied to an arbitrary two-mode N-photon system, further development of optical quantum classifiers, such as extensions to quantum entangled and multiphoton states, is expected in the future.

关键词： Machine learning Optical quantum information processing Quantum algorithms

来源：评论

学校读者我要写书评

暂无评论

Electro-Optic Modulation Performance in Kta1-Xnbxo3 Crystal

SSRN

引用

SSRN 2023年

作者： Zhang, JianWei Du, XiaoPing Zhao, JiGuang Lv, XiaoLei Wang, Yang Li, FuHao Wang, XuPing Liu, Bing Duan, YongSheng Department of Electron & Optics Engineering Space Engineering University Beijing101416 China Beijing Institute of Tracking and Telecommunications Technology Beijing100094 China Graduate schools Space Engineering University Beijing101416 China Advanced Materials Institute Qilu University of Technology Shandong Academy of Sciences Jinan250014 China Department of Aerospace Science and Technology Space Engineering University Beijing101416 China

Motivated by the demand for achieving high modulation depth of optical signal in Three-dimensional (3D) imaging LiDAR, the electro-optic (EO) modulation depth of KTa1-xNbxO3 (KTN) crystal and its stability under the electric field have been investigated. The strong field-enhanced effect of dielectric permittivity occurs owing to the dielectric resonance, the modulation depth is enhanced and half-wave voltage is further *** applying the AC electric field, the modulation depth increases with the increment of electric field and trends to remain unchanged under the high owing to the saturation of polar nanoregions (PNRs) in KTN crystal. The modulation depth fluctuates with time, which can reduce the ranging accuracy of 3D imaging LiDAR. We found it can be attributed by the instability of *** increased modulation depth and its enhanced stability were discovered through improving the polarization and stability of PNRs by applying the DC electric field, which reveals that the DC+AC electric field can increase the ranging accuracy of LiDAR compared to the AC electric field. The study will provide guidance for designing the EO modulator for high-accuracy 3D imaging LiDAR from the perspective of Nanodomain engineering and Electric-Field-Driven Systems. © 2023, The Authors. All rights reserved.

关键词： Stability

来源：评论

学校读者我要写书评

暂无评论

Study on Multi-Scale Failure Mechanism and Damage Evolution Constitutive Relation of Poly(Phthalazine Ether Sulfone Ketone) in a Wide Temperature Range

SSRN

引用

SSRN 2023年

作者： Shen, Liangliang Zhou, Xin Zhu, Tianqi Xiao, Chenglong Zhao, Gang Jian, Xigao Xu, Jian Ren, Zhiying State Key Laboratory of Fine Chemicals Liaoning High Performance Polymer Engineering Research Center School of Chemical Engineering Dalian University of Technology Dalian116024 China Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Material Technology and Engineering Chinese Academy of Science Ningbo315201 China Department of Mechanical Materials and Manufacturing Engineering University of Nottingham Ningbo China Ningbo315100 China School of Mechanical Engineering and Automation Fuzhou University Fuzhou350116 China School of Mechanical Engineering Zhejiang University of Technology Hangzhou310018 China

In this work, the multi-scale failure and damage constitutive relationship of PPESK are investigated via quasi-static tensile/bending tests and scanning electron microscopy characterization methods, and the cross-scale three-dimensional failure damage evolution constitutive model of PPESK within a broad temperature range is constructed for the first time. Based on the findings, the temperature boundary effect concept of PPESK is proposed as follows: the cumulative damage of pore initiation and craze expansion and cracking at the microscopic scale of PPESK are the essential factors of material failure and damage at various temperatures, which simultaneously presents a strong The temperature sensitivity is specifically manifested in the gradual evolution of quasi-brittleness and viscoelasticity in the temperature range of 295 K-472 K. In order to further develop the basic research tools of materials, the secondary compilation input of the PPESK material property is performed in the finite element software, and the construction work of the PPESK multi-scale failure damage constitutive relationship is carried out. The experimental data are finally combined with the simulated crack failure pattern and mechanical behavior of the material, and the mapping relationship with the constitutive model for further validity verification. © 2023, The Authors. All rights reserved.

关键词： Constitutive models

来源：评论

学校读者我要写书评

暂无评论

Softening and recrystallization behavior of a new class of ferritic steel

引用

Journal of Iron and Steel Research International 2019年第2期26卷 154-161页

作者： Xiang-yu Xu Jian-zhe Li Xue-min Wang Wei Zhang Qian-nan Liu Cheng-jia Shang R.D.K.Misra Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Laboratory for Excellence in Advanced Steel Research Materials Science and Engineering ProgramDepartment of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El PasoEl PasoTX 79968USA

In order to clarify the recrystallization mechanism of low-densityδ-ferrite steel Fe-4AI-2Ni,interrupted and single-pass compression tests were carried *** this regard,five deformation temperatures(750-950 at an interval of 50°C)and different hold time were *** was observed that the softening and recrystallization fraction was enhaneed with increased deformation temperature and hold *** original grain bounclaries were the preferred nucleation sites for recrystallized grains,and recrystallization had an impact on obtaining homogeneous and fine-grained *** in the ferritic alloy commenced after a significant degree of softening,and the softening associated with recovery was appreciably *** optimum rolling deformation temperature was identified to be greater than 900°C.

关键词： δ-ferrite steel Interrupted compression test Recovery Recrystallization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：