检索结果-内蒙古大学图书馆

Computing grain boundary diagrams of thermodynamic and mechanical properties

npj Computational materials 2021年第1期7卷 1442-1453页

作者： Chongze Hu Yanwen Li Zhiyang Yu Jian Luo Department of Nanoengineering University of California San DiegoLa JollaCA 92093USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093USA State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou University350002 FuzhouFujianP.R.China Department of Physics Southern University of Science and TechnologyShenzhenGuangdong 518055P.R.China

Computing the grain boundary(GB)counterparts to bulk phase diagrams represents an emerging research *** a classical embrittlement model system Ga-doped Al alloy,this study demonstrates the feasibility of computing temperature-and composition-dependent GB diagrams to represent not only equilibrium thermodynamic and structural characters,but also mechanical ***,hybrid Monte Carlo and molecular dynamics(MC/MD)simulations are used to obtain the equilibrium GB structure as a function of temperature and *** GB structures are validated by aberrationcorrected scanning transmission electron ***,MD tensile tests are performed on the simulated equilibrium GB *** diagrams are computed for not only GB adsorption and structural disorder,but also interfacial structural and chemical widths,MD ultimate tensile strength,and MD tensile *** study suggests a research direction to investigate GB composition–structure–property relationships via computing GB diagrams of thermodynamic,structural,and mechanical(or potentially other)properties.

关键词： grain toughness alloy

来源：评论

学校读者我要写书评

暂无评论

Quantitative Analysis of Sodium Metal Deposition and Interphase in Na Metal Batteries

arXiv

引用

arXiv 2023年

作者： Sayahpour, Baharak Li, Weikang Bai, Shuang Lu, Bingyu Han, Bing Chen, Yu-Ting Deysher, Grayson Parab, Saurabh Ridley, Phillip Raghavendran, Ganesh Nguyen, Long Hoang Bao Zhang, Minghao Meng, Ying Shirley Materials Science and Engineering Program University of California San DiegoCA92093 United States Department of NanoEngineering University of California San DiegoCA92093 United States Pritzker School of Molecular Engineering University of Chicago ChicagoIL60637 United States

Sodium-ion batteries exhibit significant promise as a viable alternative to current lithium-ion technologies owing to their sustainability, low cost per energy density, reliability, and safety. Despite recent advancements in cathode materials for this category of energy storage systems, the primary challenge in realizing practical applications of sodium-ion systems is the absence of an anode system with high energy density and durability. Although Na metal is the ultimate anode that can facilitate high-energy sodium-ion batteries, its use remains limited due to safety concerns and the high-capacity loss associated with the high reactivity of Na metal. In this study, titration gas chromatography is employed to accurately quantify the sodium inventory loss in ether- and carbonate-based electrolytes. Uniaxial pressure is developed as a powerful tool to control the deposition of sodium metal with dense morphology, thereby enabling high initial coulombic efficiencies. In ether-based electrolytes, the Na metal surface exhibits the presence of a uniform solid electrolyte interphase layer, primarily characterized by favorable inorganic chemical components with close-packed structures. The full cell, utilizing a controlled electroplated sodium metal in ether-based electrolyte, provides capacity retention of 91.84% after 500 cycles at 2C current rate and delivers 86 mAh/g discharge capacity at 45C current rate, suggesting the potential to enable Na metal in the next generation of sodium-ion technologies with specifications close to practical requirements. © 2023, CC BY-NC-ND.

关键词： Ethers

来源：评论

学校读者我要写书评

暂无评论

Mechanical plasticity of cell membranes enhances epithelial wound closure

引用

Physical Review Research 2024年第1期6卷 L012036-L012036页

作者： Andrew T. Ton Arthur K. MacKeith Mark D. Shattuck Corey S. O'Hern Department of Physics Yale University New Haven Connecticut 06520 USA Integrated Graduate Program in Physical and Engineering Biology Yale University New Haven Connecticut 06520 USA Department of Mechanical Engineering & Materials Science Yale University New Haven Connecticut 06520 USA Benjamin Levich Institute and Physics Department City College of New York New York New York 10031 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA

During epithelial wound healing, cell morphology near the healed wound and the healing rate vary strongly among different developmental stages even for a single species like Drosophila. We develop deformable particle (DP) model simulations to understand how variations in cell mechanics give rise to distinct wound closure phenotypes in the Drosophila embryonic ectoderm and larval wing disc epithelium. We find that plastic deformation of the cell membrane can generate large changes in cell shape consistent with wound closure in the embryonic ectoderm. Our results show that the embryonic ectoderm is best described by cell membranes with an elasto-plastic response, whereas the larval wing disc is best described by cell membranes with an exclusively elastic response. By varying the mechanical response of cell membranes in DP simulations, we recapitulate the wound closure behavior of both the embryonic ectoderm and the larval wing disc.

关键词： Cell mechanics Jamming Cell membrane Epithelial cells

来源：评论

学校读者我要写书评

暂无评论

Effect of Heat Treatment on Improving Oer Activity of Nifeooh Based Aerogels: A Combined Experimental and Theoretical Study

SSRN

引用

SSRN 2024年

作者： Lakhanlal Rimon, Or Moschkowitsch, Wenjamin Elbaz, Lior Toroker, Maytal Caspary Department of Materials Science and Engineering Technion-Israel Institute of Technology Haifa3200003 Israel Bar Ilan University Ramat-Gan52900 Israel The Nancy and Stephen Grand Technion Energy Program Technion - Israel Institute of Technology Haifa3200003 Israel

Enhanced catalytic activity of oxygen evolution reaction (OER) catalysts can make water electrolysis more efficient. This study focuses on the use of a simple strategy of heat treatment to enhance the catalytic activity of NiFeOOH-based aerogels. The study shows that heat treatment of this aerogel at 150 °C leads to significant improvement in its catalytic activity, as evident in the staircase voltammetry results. To understand how heat treatment improves the catalytic activity, a DFT+U calculation was carried out on heat-treated and non-heat treated catalysts. The calculation shows that the overpotential for OER decreases with heat treatment, which is related to the relative stability of the intermediates in heat-treated and non-heat treated catalysts. Also, it has been found that heat treatment decreases work function, which might improve charge transfer and, thus, catalytic activity. Our calculations are in line with the experimental results that demonstrate the potential of controlling water content on catalytic efficiency. © 2024, The Authors. All rights reserved.

关键词： Heat treatment

来源：评论

学校读者我要写书评

暂无评论

Microstructural Evolution and Stability During Strain-Controlled Fatigue in a Multiphase Microalloyed Steel

SSRN

引用

SSRN 2022年

作者： Shanmugam, Sankaran Madhavan, R. Suwas, Satyam Ray, R.K. Padmanabhan, K.A. Department of Metallurgical and Materials Engineering Indian Institute of Technology Madras Chennai600036 India Center for Agile and Adaptive Additive Manufacturing University of North Texas DentonTX76205 United States Department of Materials Engineering Indian Institute of Science Bangalore560012 India Indian Institute of Engineering Science and Technology Shibpur Howrah711103 India Materials Science & Engineering Program Department of Mech. Eng. Anna University Chennai600025 India

Multiphase ferrite-bainite-martensite (F-B-M) microstructure processed through rolling and two-step cooling in a V-microalloyed steel exhibited excellent stability under strain-controlled fatigue. The steel exhibited a steady state response and even cyclic hardening up to a total strain amplitude of 0.6% and displayed a cyclic softening response at total strain amplitudes > 0.7%. To understand and determine the degradation mechanisms, a detailed transmission electron microscopic investigation was carried out in fatigue tested samples as a function of total strain amplitude. At low strain amplitudes ( © 2022, The Authors. All rights reserved.

关键词： Martensite

来源：评论

学校读者我要写书评

暂无评论

Active modulation of valley excitons in a monolayer WSe2 via chiral metamaterials

Active modulation of valley excitons in a monolayer WSe2 via...

引用

2020 Frontiers in Optics Conference, FiO 2020

作者： Wu, Zilong Zheng, Yuebing Walker Department of Mechanical Engineering Materials Science and Engineering Program Texas Materials Institute University of Texas at Austin AustinTX78712 United States

Active modulation of handedness-selective valley dynamics in a monolayer WSe2 is achieved using plasmonic moiré chiral metamaterials (MCMs) with strong and dynamically tunable optical chirality. © OSA 2020 &... 详细信息

ISBN: (纸本)9781943580804

关键词： Monolayers

来源：评论

学校读者我要写书评

暂无评论

Machine-learned design principles for enhanced red emission from nitride quantum wells

arXiv

引用

arXiv 2024年

作者： Pant, Nick Armitage, Rob Kioupakis, Emmanouil Applied Physics Program University of Michigan Ann ArborMI48109 United States Department of Materials Science & Engineering University of Michigan Ann ArborMI48109 United States Lumileds LLC San JoseCA95131 United States

Significant effort has been devoted toward mitigating polarization fields in nitride LEDs, as they are viewed as detrimental to light emission, albeit with limited success for red emission. Here, we show that such fields can unusually enhance the optical oscillator strength of red-emitting nitride quantum wells. This insight is enabled by machine-learned models trained on multi-scale quantum-mechanical simulations, which allow for a global exploration of the quantum-well design space at greatly reduced computational cost. Larger polarization fields correlate with higher wave-function overlaps for red emission, a consequence of the quantum-confined Stark effect enabling thinner quantum wells. This finding has implications for designing efficient red nitride LEDs, which are crucial for miniaturizing polychromatic LED pixels to the micron scale for extended-reality and biomedical applications. More broadly, this work highlights the power of machine learning in accelerating the discovery of unconventional paradigms for semiconductor design. Copyright © 2024, The Authors. All rights reserved.

关键词： Semiconductor quantum wells

来源：评论

学校读者我要写书评

暂无评论

Periodic phase diagrams in micromagnetics with an eigenvalue solver

arXiv

引用

arXiv 2024年

作者： Ai, Fangzhou Lin, Zhuonan Duan, Jiawei Lomakin, Vitaliy Department of Electrical and Computer Engineering University of California La Jolla San DiegoCA92093 United States Center for Memory and Recording Research University of California La Jolla San DiegoCA92093 United States Program in Materials Science and Engineering University of California La Jolla San Diego92093 United States

This work introduces an approach to compute periodic phase diagram of micromagnetic systems by solving a periodic linearized Landau-Lifshitz-Gilbert (LLG) equation using an eigenvalue solver with the Finite Element Method formalism. The linear operator in the eigenvalue problem is defined as a function of the periodic phase shift wave vector. The dispersion diagrams are obtained by solving the eigenvalue problem for complex eigen frequencies and corresponding eigen states for a range of prescribed wave vectors. The presented approach incorporates a calculation of the periodic effective field, including the exchange and magnetostatic field components. The approach is general in that it allows handling 3D problems with any 1D, 2D, and 3D periodicities. The ability to calculated periodic diagrams provides insights into the spin wave propagation and localized resonances in complex micromagnetic structures. © 2024, CC BY-NC-ND.

关键词： Spin waves

来源：评论

学校读者我要写书评

暂无评论

A Robust Bendable Irox Thin Film Via Mild Alkaline Solution Process for Neuron Stimulating Electrodes

SSRN

引用

SSRN 2023年

作者： Tso, Kuang-Chih Chan, Tzu-Ying Yu, Tsung-Chun Pan, Shih-Chin Chu, Chao-Yi Chen, San-Yuan Lee, Jyh-Fu Ohta, Jun Wu, Pu-Wei Chen, Po-Chun Graduate Program of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu300 Taiwan Division of Materials Science Graduate School of Science and Technology Nara Institute of Science Technology Takayama Ikoma Nara8916-5 Japan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei106 Taiwan National Synchrotron Radiation Research Center Hsinchu300 Taiwan

We demonstrate a unique chemical formula to deposit hydrous iridium oxide thin film on a platinum-coated polyimide substrate. In a mild alkaline solution, the iridium (III) precursor undergoes the ligand exchange and hydrolysis reaction to become the iridium (III) dimers that are physically adsorbed on the substrate for subsequent heterogeneous condensation and growth of amorphous hydrous iridium oxide thin film. Both UV-Vis and X-ray absorption spectroscopy (XAS) are employed to determine the reaction steps involved. The chemical nature and crystallinity of the hydrous iridium oxide thin film are investigated by XAS, X-ray photon spectroscopy, and X-ray diffraction. The hydrous iridium oxide thin film reveals an impressive normalized charge storage capacity (CSC) of 0.3 mC/cm2-nm and a low impedance (80.5 Ω) at 1k Hz. In addition, in bending test of 3,000 cycles, the hydrous iridium oxide thin film retains 91.2% of its initial normalized CSC without any physical crack and delamination. The cell viability test suggests negligible bio-toxicity. Our results provide a solid evidence of fabricating a robust flexible electrode for neural interfaces for potential use in implantable electronic devices. © 2023, The Authors. All rights reserved.

关键词： Iridium compounds

来源：评论

学校读者我要写书评

暂无评论

Effect of storage conditions on the dietary and pharmaceutical values of ginger oil, and modeling its dielectric properties

引用

Grasas y Aceites 2024年第4期75卷

作者： Abushal, S.A. Uguru, H. Akpomedaye, O. Kuzmin, A. Sami, R. Helal, M. Alsanei, W.A. Almehmadi, A.M. ALmasoudi, A.G. Program of Food Sciences and Nutrition Turabah University College Taif University Saudi Arabia Department of Agricultural Engineering Delta State University of Science and Technology Ozoro Nigeria Department of Electrical Engineering Delta State University of Science and Technology Ozoro Nigeria Department of Mechanization of Agricultural Products Processing National Research Mordovia State University Saransk Russia Scientific Laboratory of Advanced Composite Materials and Technologies Plekhanov Russian University of Economics Moscow Russia Department of Food Science and Nutrition College of Sciences Taif University Saudi Arabia Department of Mechanical Engineering Faculty of Engineering Taif University Saudi Arabia Department of Food and Nutrition Faculty of Human Sciences and Design King Abdulaziz University Jeddah Saudi Arabia Department of Clinical Nutrition Faculty of Applied Medical Sciences Umm Al-Qura University Makkah Saudi Arabia Program of Food Sciences and Nutrition Biology Department Branch of the College at Turbah Taif University Taif Saudi Arabia

This research was conducted to evaluate the impact of the storage conditions of ginger rhizomes on the nutritional and therapeutic properties of the ginger oil (GO). The physicochemical and phytochemical properties, fatty acid contents and dielectric constant (Ε′) of the GO were analyzed in accordance with standard guidelines. The findings revealed that the storage temperature significantly impacted the quality of GO (p ©2024 CSIC.

关键词： Polyunsaturated fatty acids

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：