检索结果-内蒙古大学图书馆

arXiv 2021年

作者： Shivakumar, Sashank Qin, Mingde Zhang, Dawei Hu, Chongze Yan, Qizhang Luo, Jian Department of NanoEngineering Program of Materials Science and Engineering University of California San Diego La Jolla CA92093 United States

A new type of compositionally complex (medium- or high-entropy) M5Si3 silicides is synthesized. Both (V1/5Cr1/5Nb1/5Ta1/5W1/5)5Si3 and (Ti1/5Zr1/5Nb1/5Mo1/5Hf1/5)5Si3 form single-phase homogenous solid solutions. Notably, (V1/5Cr1/5Nb1/5Ta1/5W1/5)5Si3 forms the hexagonal γ (D88) phase, while all its five constituent binary silicides, V5Si3, Cr5Si3, Nb5Si3, Ta5Si3, and W5Si3, are stable in the tetragonal α (D8l) or β (D8m) phases. Annealing at 1600oC demonstrates that this hexagonal γ phase is stable. Comparison of the experimental and calculated X-ray diffraction patterns, Rietveld refinements, and analysis of aberration-corrected scanning transmission electron microscopy high-angle annular dark-field images suggest cation ordering, which reduces the configurational entropy. This work expands the field of high-entropy and compositional complex ceramics by not only discovering a new compositional complex silicide phase but also demonstrating the cation ordering and unusual phase stability. These compositionally complex silicides can be combined with refractory high-entropy alloys to make the high-entropy counterparts to the Nb-silicide and Mo-Si-B composites. © 2021, CC BY.

关键词： Entropy

来源：评论

学校读者我要写书评

暂无评论

Machine Learning Moment Tensor Potential for Modelling Dislocation and Fracture in L10-TiAl and D019-Ti3Al Alloys

arXiv

引用

arXiv 2023年

作者： Qi, Ji Aitken, Z.H. Pei, Qingxiang Tan, Anne Marie Z. Zuo, Yunxing Jhon, M.H. Quek, S.S. Wen, T. Wu, Zhaoxuan Ong, Shyue Ping Materials Science and Engineering Program University of California San Diego 9500 Gilman Dr Mail Code 0448 La Jolla CA92093-0448 United States 1 Fusionopolis Way Connexis #16-16 Singapore138632 Singapore Department of NanoEngineering University of California San Diego 9500 Gilman Dr Mail Code 0448 La Jolla CA92093-0448 United States Department of Mechanical Engineering The University of Hong Kong Hong Kong Department of Materials Science and Engineering City University of Hong Kong Hong Kong Hong Kong Institute for Advanced Study City University of Hong Kong Hong Kong

Dual-phase γ-TiAl and α2-Ti3Al alloys exhibit high strength and creep resistance at high temperatures. However, they suffer from low tensile ductility and fracture toughness at room temperature. Experimental studies show unusual plastic behaviour associated with ordinary and superdislocations, making it necessary to gain a detailed understanding on their core properties in individual phases and at the two-phase interfaces. Unfortunately, extended superdislocation cores are widely dissociated beyond the length scales practical for routine first-principles density-functional theory (DFT) calculations, while extant interatomic potentials are not quantitatively accurate to reveal mechanistic origins of the unusual core-related behaviour in either phases. Here, we develop a highly-accurate moment tensor potential (MTP) for the binary Ti-Al alloy system using a DFT dataset covering a broad range of intermetallic and solid solution structures. The optimized MTP is rigorously benchmarked against both previous and new DFT calculations, and unlike existing potentials, is shown to possess outstanding accuracy in nearly all tested mechanical properties, including lattice parameters, elastic constants, surface energies, and generalized stacking fault energies (GSFE) in both phases. The utility of the MTP is further demonstrated by producing dislocation core structures largely consistent with expectations from DFT-GSFE and experimental observations. The new MTP opens the path to realistic modelling and simulations of bulk lattice and defect properties relevant to the plastic deformation and fracture processes in γ-TiAl and α2-Ti3Al dual-phase alloys. © 2023, CC BY.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

Low-Temperature Synthesis of Weakly Confined Carbyne inside Single-Walled Carbon Nanotubes

arXiv

引用

arXiv 2024年

作者： Zhang, Bo-Wen Qiu, Xi-Yang Ma, Yicheng Hu, Qingmei Fitó-Parera, Aina Kohata, Ikuma Feng, Ya Zheng, Yongjia Zhang, Chiyu Matsuo, Yutaka Wang, YuHuang Chiashi, Shohei Otsuka, Keigo Xiang, Rong Levshov, Dmitry I. Cambré, Sofie Wenseleers, Wim Rotkin, Slava V. Maruyama, Shigeo Department of Mechanical Engineering The University of Tokyo Tokyo113-8656 Japan State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical Engineering Zhejiang University Hangzhou310027 China Theory and Spectroscopy of Molecules and Materials Department of Physics University of Antwerp Antwerp2610 Belgium Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy and Power Engineering Dalian University of Technology Liaoning 116024 China Department of Chemistry and Biochemistry Chemical Physics Program Maryland Nano Center University of Maryland College ParkMD20742 United States Department of Chemical Systems Engineering Graduate School of Engineering Nagoya University Nagoya464-8603 Japan Institute of Materials Innovation Institutes for Future Society Nagoya University Nagoya464-8603 Japan Theory and Spectroscopy of Molecules and Materials Department of Chemistry University of Antwerp Antwerp2610 Belgium Nanostructured and Organic Optical and Electronic Materials Department of Physics University of Antwerp Antwerp2610 Belgium Materials Research Institute Department of Engineering Science & Mechanics The Pennsylvania State University University ParkPA16802 United States

Carbyne, a one-dimensional (1D) carbon allotrope with alternating triple and single bonds, has the highest known mechanical strength but is unstable to bending, limiting synthesis to short linear chains. Encapsulation within carbon nanotubes (CNTs) stabilizes carbyne, forming confined carbyne (CC), thus enabling further research concerning attractive 1D physics and materials properties of carbyne. While CC has been synthesized in multi-walled CNTs (MWCNTs) using the arc-discharge method and in double-walled CNTs (DWCNTs) via high-temperature high-vacuum (HTHV) method, synthesis in single-walled CNTs (SWCNTs) has been challenging due to their fragility under such conditions. In this work, we report a low-temperature method to synthesize CC inside SWCNTs (CC@SWCNT). By annealing SWCNTs containing ammonium deoxycholate (ADC) at 400°C, ADC is converted into CC without damaging the SWCNTs. Raman spectroscopy revealed a strong CC phonon (CC-mode) peak at 1860–1870 cm-1, much stronger than the SWCNT G-band peak, confirming a high fraction of CC in the resulting material. The Raman mapping result showed the uniformity of the CC-mode signal across the entire film sample, proving the high efficiency of this method in synthesizing CC in every SWCNT of appropriate size. Notably, the CC-mode peaks of CC@SWCNT (above 1860 cm-1) are higher than those reported in previous CC@CNT samples (mostly -1). This is attributed to larger SWCNT diameters (>0.95 nm) used in this study, compared to the typical 0.6–0.8 nm range. Larger diameters result in reduced confinement, allowing carbyne to closely resemble free-standing carbyne while remaining stabilized. This low-temperature synthesis of long-chain, nearly freestanding carbyne within large-diameter SWCNTs offers new opportunities for exploring 1D physics and the unique properties of carbyne for potential applications. © 2024, CC BY-NC-ND.

关键词： Single-walled carbon nanotubes (SWCN)

来源：评论

学校读者我要写书评

暂无评论

Global Estimates of Spatially Distributed Surface Energy Fluxes using Thermodynamic Principles

arXiv

引用

arXiv 2022年

作者： Gupta, Mayank Wild, Martin Ghosh, Subimal Centre for Urban Science and Engineering Indian Institute of Technology Bombay Mumbai400076 India ETH Zurich Institute for Atmospheric and Climate Science Zürich8001 Switzerland Interdisciplinary Program in Climate Studies Indian Institute of Technology Bombay Mumbai400076 India Department of Civil Engineering Indian Institute of Technology Bombay Mumbai400076 India

Limited surface observations of turbulent heat fluxes result in incomplete knowledge about the surface energy balance that drives the climate system. Here, we developed a novel, purely physics-based analytical method grounded on the thermodynamic principle of maximum power. The approach derives the turbulent heat flux only from the four inputs of incoming and outgoing radiations at the land surface. The proposed approach does not use any parameterization, unlike the existing surface energy balance models, and hence does not suffer from uncertainty due to the *** validated our methodology with 102 eddy covariance observation stations around the globe with different land use land covers. Using the satellite observations from CERES at a spatial resolution of 10, we have obtained spatially distributed global analytical estimates of Sensible (H), latent heat (LE), and land surface heat storage (∆Qs) fluxes for the first time. For a global observed land Net radiation (Q∗) of 84 Wm-2 from the satellite, we found H, LE and ∆Qs to be 42 Wm-2, 40 Wm-2 and 2 Wm-2, respectively. The theoretical and precise estimates of all surface energy balance components will improve our understanding of surface warming for different land use land covers across the globe. © 2022, CC BY.

关键词： Heat storage

来源：评论

学校读者我要写书评

暂无评论

Grain Structure – Resistivity Relationship of Ru ALD Precursors

Grain Structure – Resistivity Relationship of Ru ALD Precur...

引用

International Symposium on VLSI Technology, Systems and Applications

作者： Michael Breeden Victor Wang Francis Yu Andrew C. Kummel Materials Science and Engineering Program University of California San Diego CA USA University of California San Diego CA USA

The atomic layer deposition of ruthenium has been previously reported with a wide variety of precursors. However, the search for a Ru ALD process that can deposit a film with a resistivity close to that of bulk Ru (~7 μΩ · cm) is ongoing, with an emerging interest in processes that can selectively deposit low-resistance Ru films. In this work, the grain structure and resistivity relationship for Ru ALD precursors Ru(IHD)₂(CO)₂ and Ru(CpEt) 2 using O₂ as a coreactant is investigated using electrical measurements by four-point-probe, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction/reflectometry (XRD/XRR).

关键词： Spectroscopy Ruthenium Atomic layer deposition Electric variables measurement Conductivity X-ray diffraction Very large scale integration

来源：评论

学校读者我要写书评

暂无评论

Application of distinct multi criteria decision analysis techniques in the manufacturing sector: A comprehensive review

引用

materials Today: Proceedings 2023年

作者： Mazumdar, Nilanjan Sharma, Jai Kumar Shavkatovich, Shavkatov Navruzbek Uike, Dipesh Kadam, Sanjeev Verma, Mrinal Alam, Mohammed Jaber sharma, Abhay Thakur, Abhishek Al Ansari, Mohammed Saleh Department of Business Administration University of Science and Technology Meghalaya 793101 India School of Management Maharaja Agrasen University Baddi Solan HP India Department of Corporate Finance and Securities Tashkent Institute of Finance Tashkent Uzbekistan Dr. Ambedkar Institute of Management Studies and Research Deekshabhoomi Nagpur 440010 India Pune Maharashtra India KIET Group of Institutions Delhi-NCR Ghaziabad 201206 India School of Engineering and Technology CQUniversity Queensland Australia Faculty of Engineering Multimedia University Cyberjaya Malaysia School of Physics and Materials Science Shoolini University Solan HP 173229 India Department of Chemical Engineering University of Bahrain Zallaq Bahrain

Multi-criteria decision making (MCDM) have been utilized by a variety of researchers beginning in the early 1970 s with the goal of improving decision-making in the field manufacturing industry. MCDM is an operational research method that also incorporates software. This method assists in decision making by assessing numerous contradicting criteria or objectives all at once. The MCDM approaches have evolved throughout the course of the years, and as a result, several new ways have been developed. This review article performs a literature survey of various optimization techniques that are utilized to select the best possible option among various options in various criteria such as selection of supplier, selection of best raw material and optimization of machining parameters in manufacturing processes. The analysis of a number of approaches that was carried out in the study enables a specific approach to be chosen that is appropriate for the circumstance. © 2023 Elsevier Ltd. All rights reserved.

关键词： Decision making

来源：评论

学校读者我要写书评

暂无评论

Meaningful human control: actionable properties for AI system development

引用

AI and Ethics 2022年第1期3卷 241-255页

作者： Cavalcante Siebert, Luciano Lupetti, Maria Luce Aizenberg, Evgeni Beckers, Niek Zgonnikov, Arkady Veluwenkamp, Herman Abbink, David Giaccardi, Elisa Houben, Geert-Jan Jonker, Catholijn M. van den Hoven, Jeroen Forster, Deborah Lagendijk, Reginald L. AiTech Interdisciplinary Research Program on Meaningful Human Control Delft University of Technology Delft The Netherlands Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft The Netherlands Faculty of Industrial Design Engineering Delft University of Technology Delft The Netherlands Faculty of Mechanical Maritime and Materials Engineering Delft University of Technology Delft The Netherlands Faculty of Technology Policy and Management Delft University of Technology Delft The Netherlands

How can humans remain in control of artificial intelligence (AI)-based systems designed to perform tasks autonomously? Such systems are increasingly ubiquitous, creating benefits - but also undesirable situations where moral responsibility for their actions cannot be properly attributed to any particular person or group. The concept of meaningful human control has been proposed to address responsibility gaps and mitigate them by establishing conditions that enable a proper attribution of responsibility for humans; however, clear requirements for researchers, designers, and engineers are yet inexistent, making the development of AI-based systems that remain under meaningful human control challenging. In this paper, we address the gap between philosophical theory and engineering practice by identifying, through an iterative process of abductive thinking, four actionable properties for AI-based systems under meaningful human control, which we discuss making use of two applications scenarios: automated vehicles and AI-based hiring. First, a system in which humans and AI algorithms interact should have an explicitly defined domain of morally loaded situations within which the system ought to operate. Second, humans and AI agents within the system should have appropriate and mutually compatible representations. Third, responsibility attributed to a human should be commensurate with that human’s ability and authority to control the system. Fourth, there should be explicit links between the actions of the AI agents and actions of humans who are aware of their moral responsibility. We argue that these four properties will support practically minded professionals to take concrete steps toward designing and engineering for AI systems that facilitate meaningful human control.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Influence of Pressure and Powder Characteristics on the Properties and Microstructure of Colmonoy-5 Alloy Sintered by Spark Plasma Sintering

SSRN

引用

SSRN 2024年

作者： Silva, Escarlet Batista Matlakhova, Lioudmila A. Azevedo, Márcia Giardinieri Oliveira, Bárbara Ferreira Monteiro, Sérgio Neves Oliveira, Luciano José UENF - State University of the Northern Rio de Janeiro LAMAV – Advanced Materials Laboratory Av. Alberto Lamego 2000 - RJ Campos dos Goytacazes28013-602 Brazil IME - Military Institute of Engineering Materials Science Program Praça Gen. Tibúrcio 80 Urca RJ Rio de Janeiro22290-270 Brazil UFF - Fluminense Federal University Institute of Society Science ICM/MDM Av. Aloízio da Silva Gomes 50 – Granja dos Cavalheiros Macaé Brazil

Colmonoy are Ni-based hardfacing alloys, which are normally deposited by welding process on stainless steel substrates for coating applications. This study aims to evaluate the microstructure and the final properties of a Colmonoy-5 (NiCrSiBC) consolidated by spark plasma sintering (SPS), as an alternative route to current deposition processes. Two batches of Colmonoy-5 alloy powders with different particle sizes were used for sample processing. SPS sintering occurred at 900ºC under either 50 MPa or 60 MPa pressure for 15 min. The sintered samples were evaluated according to their density using the Archimedes’ method, morphology by Confocal microscopy, phasic composition by XRD, microstructure by SEM and EDS, as well as Vickers hardness. Results showed that the Colmonoy-5 alloy can be effectively produced through SPS sintering, achieving satisfactory densification. The initial morphology of precursor powders can influence the size of the precipitated phases in the Ni matrix. It was found that sintering under pressure of 50 MPa was more effective in processing the Colmonoy-5. © 2024, The Authors. All rights reserved.

关键词： Morphology

来源：评论

学校读者我要写书评

暂无评论

Calendar aging of zinc-ion batteries

引用

Matter 2025年第5期8卷

作者： Wu, Zhuoxi Li, Qing Chen, Ze Zhi, Chunyi Department of Materials Science and Engineering City University of Hong Kong Hong Kong SAR Kowloon999077 China Institute of Applied Physics and Materials Engineering University of Macau Macau SAR999078 China School of Interdisciplinary Studies Lingnan University Hong Kong China Hong Kong Institute for Advanced Study City University of Hong Kong Hong Kong SAR Kowloon999077 China Hong Kong Institute for Clean Energy City University of Hong Kong Hong Kong SAR Kowloon999077 China Centre for Advanced Nuclear Safety and Sustainable Development City University of Hong Kong Hong Kong SAR Kowloon999077 China

Zinc-ion batteries (ZIBs) have garnered significant attention as potential candidates for large-scale energy storage. In recent years, researchers have made notable progress in extending the cycle life of ZIBs. However, another critical factor, calendar aging, also plays a significant role in applying ZIBs practically. The current research achievements and expectations for the practical application of ZIBs highlight the urgent need for an in-depth investigation of their calendar aging. Nevertheless, the stimuli affecting the calendar aging of ZIBs remain unclear. Before conducting a systematic study, it is essential to identify and clarify the stimuli that may influence the calendar aging of ZIBs and understand the interlaced relationships between them. This perspective comprehensively discusses the potential effects of internal stimuli, such as Zn anode passivation, Zn depletion, electrolyte consumption, and cathode dissolution, as well as external stimuli, including the state of charge (SOC), temperature, pressure, and battery packaging, on the calendar aging of ZIBs. Additionally, some promising research methods are proposed to help researchers further understand and improve the calendar aging of ZIBs. © 2025 Elsevier Inc.

关键词： Binary alloys

来源：评论

学校读者我要写书评

暂无评论

Photo-thermal CO_(2) reduction with methane on group Ⅷ metals:In situ reduced WO_(3) support for enhanced catalytic activity

引用

Chinese Journal of Catalysis 2021年第11期42卷 1976-1982页

作者： Huimin Liu Xianguang Meng Weiwei Yang Guixia Zhao Dehua He Jinhua Ye School of chemical and environmental engineering Liaoning University of TechnologyJinzhou 121001LiaoningChina International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukubaIbaraki 305-0044Japan Innovative Catalysis Program Key Laboratory of Organic Optoelectronics&Molecular Engineering of Ministry of EducationDepartment of ChemistryTsinghua UniversityBeijing 100084China

Photo-thermal CO_(2) reduction with methane(CRM)is beneficial for solar energy harvesting and energy *** search for efficient photo-thermal catalysts is of great ***,we reveal that group Ⅷ metal catalysts supported by optical material WO_(3) are more effective for photo-thermal CRM,giving catalytic activities with visible light assistance that are 1.4-2.4 times higher than that achieved under thermal *** activity enhancement(1.4-2.4 times)was comparable to that achieved with plasmonic-Au-promoted catalysts(1.7 times).Characterization results indicated that WO_(3) was partially reduced to WO_(3-x) in situ under the reductive CRM reaction atmosphere,and that WO_(3-x) rather than WO_(3) enhanced the activities with visible light *** method provides a promising approach for improving the activity of catalysts under light irradiation.

关键词： Tungsten oxide Visible light In situ reduction Photocatalysis CO_(2) reduction

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：