检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Xiong, Feng Wu, Yuan Liu, Xiongjun Wang, Hui Jiang, Suihe Zhang, Xiaobin Lu, Zhaoping Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China

High-entropy alloys (HEAs) with a face-centered cubic (FCC) lattice usually exhibit decent ductility but low yield strength at cryogenic temperatures. In order to address this issue, in this study, nanotwin structures containing high-density dislocations were prepared in a typical FCC Al0.1CoCrFeNi HEA by multiaxial cryogenic forging (MACF). At 77 K, the Al0.1CoCrFeNi HEA exhibits high tensile yield strength of 1263 MPa and large ductility of 30% after five cycles of the MACF treatment. The interplay between forging cycles and microstructures was explored, and the related strengthening mechanism related to the synergistic effect of nanotwins and dislocations was discussed. © 2023, The Authors. All rights reserved.

关键词： Yield stress

来源：评论

学校读者我要写书评

暂无评论

Electrically switchable structural patterns and diffractions in a dual frequency nematic liquid crystal

引用

Chinese Optics Letters 2023年第8期21卷 38-43页

作者：宋振鹏李子扬尚小虎李超逸马玲玲陆延青李炳祥 College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Electrically driven structural patterns in liquid crystals(LCs)have attracted considerable attention due to their electrooptical ***,we disclose various appealing reconfigurable LC microstructures in a dual frequency nematic LC(DFNLC)owing to the electroconvection-induced distortion of the LC director,including one-dimensional rolls,chevron pattern,two-dimensional grids,and unstable *** patterns can be switched among each other,and the lattice constants are modulated by tuning the amplitude and frequency of the applied electric *** electrically switchable self-assembled microstructures and their beam steering capabilities thus provide a feasible way to tune the functions of DFNLC-based optical devices.

关键词： dual frequency liquid crystals pattern formation gratings diffractions

来源：评论

学校读者我要写书评

暂无评论

Semiconductor Nanorods for Micro-LED Down Conversion with Alleviated Temperature Effect 29

Semiconductor Nanorods for Micro-LED Down Conversion with Al...

引用

29th International Display Workshops, IDW 2022

作者： Song, J. Kang, C. Prodanov, M.F. Srivastava, A.K. State Key Laboratory on Advanced Displays and Optoelectronics Technologies Centre for Display Research Department of Electronics and Computer Engineering the Hong Kong University of Science and Technology Clear Water Bay Hong Kong China

The development prospect of high-resolution displays is very broad, especially micro-LED has attracted much attention. However, due to size effects and high temperature, the development has been bottlenecked in achieving full-color display. Compared with traditional quantum dots, thermal stable quantum rods with anisotropic shapes can effectively solve the problems of Light efficiency and long-term stability. In this paper, we attempt to study the thermal stability of micro-LEDs by testing the luminous intensity changes of red and green quantum rods at different temperatures. The results show that the luminous intensity attenuation of QR can be guaranteed to be about 10% within 130eC. © 2022 ITE and SID.

关键词： Nanorods

来源：评论

学校读者我要写书评

暂无评论

A Compact 175°C High Temperature Gate Driver with Isolated Power Supply and advanced Protection for HybridPACK Drive SiC Module

A Compact 175°C High Temperature Gate Driver with Isolated ...

引用

Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Cheng Qian Neng Wang Yayong Yang Zhiqiang Jack Wang Yong Kang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665448178

The operation of silicon carbide (SiC) power semiconductor devices under high ambient temperature requires high temperature gate drivers adjacent to the devices. This paper presents a three-phase isolated gate driver circuit suitable for HybridPACK Drive (HP Drive) power modules with operating ambient temperature up to 175°C. First, an overall introduction of the gate driver structure and layout design method for reducing thermal coupling are presented. Second, detailed designs are presented in the form of sub-circuits such as desaturation protection circuit, isolated power supply, active Miller clamp, undervoltage lockout and so on. Finally, the proposed gate driver design is validated through double pulse test, continuous full-load operation under 145°C and continuous light-load test under 175°C. Comprehensive performance evaluation of proposed high temperature gate driver is presented.

关键词： Couplings Power supplies Silicon carbide Photonic band gap Design methodology Layout Asia

来源：评论

学校读者我要写书评

暂无评论

Investigation on properties of joints vacuum brazed with nickel-based adhesive tape filler metal 3

Investigation on properties of joints vacuum brazed with nic...

引用

3rd International Conference on Artificial Intelligence and advanced Manufacture, AIAM 2021

作者： Li, Yunyue Shen, Yuanxun Zhong, Sujuan Li, Xiupeng Pei, Yinyin Wang, Luyi State Key Laboratory of Advanced Brazing Filler Metals and Technology Zhengzhou Research Institute of Mechanical Engineering Zhengzhou China

ISBN: (纸本)9781450385046

In this paper, a nickel-based adhesive tape filler metal was used to braze 316L stainless steel. The melting characteristics of the filler metal were analysed by thermal analyzer. The wetting spread and brazing properties of the filler metal on 316L stainless steel were tested by vacuum brazing furnace. Then the morphology and composition of the brazed joint were analysed. The shear strength and microhardness of the brazed joint were tested. The results show that the organic matter in the brazing filler metal can be completely volatilized before the brazing filler metal starts to melt. The brazing filler metal has a good wetting and spreading effect on the surface of stainless steel, and there is no black carbon residue, so it has no effect on the brazing performance. The microstructure of the brazed joints with nickel-based adhesive tape filler metal shows that the joint interface has a good metallurgical bond, and there are no defects such as cracks and pores in the brazing joints. The interface structure is composed of nickel-based solid solution phase, Fe-Cr intermetallic compound phase, and chromium boride phase compound. The average shear strength of the brazed joint is 183.2MPa. The microhardness of the center of the brazing seam reaches 2175.37HV. From the center of the brazing seam to the direction of the base material, the microhardness gradually decreases. © 2021 ACM.

关键词： Adhesives

来源：评论

学校读者我要写书评

暂无评论

Wideband Refractive Index Extraction of Low-loss Materials with the Combined TDS-FTIR Method

Wideband Refractive Index Extraction of Low-loss Materials w...

引用

International Conference on Infrared and Millimeter Waves

作者： Lei Cao Shanshan Jia Huiting Xia Zhengya Yin State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

A method to obtain the optical constants of low loss materials in a wide frequency range was proposed based on the measured transmission data from THz-TDS and FTIR. With anchoring phase points from TDS, the phase spectrum lost in FTIR original data was successfully retrieved and the complex refractive index was acquired with standard iterative method (Nelder-Mead and Newton-Raphson). As an example, the refractive index and extinction coefficient of HRSi were extracted from 0.5 to 10 THz with both iterative method and analytic formula. Good agreement between TDS and FTIR results in the overlapped frequency range was realized.

关键词： Refractive index Propagation losses Optical variables control Loss measurement Optical materials Frequency measurement Iterative methods

来源：评论

学校读者我要写书评

暂无评论

Dual photopatterning of rotational fingerprint superstructures

引用

Chinese Optics Letters 2023年第4期21卷 85-90页

作者：潘锦涛钱嘉欣马玲玲王泽宇郑仁王宁李炳祥陆延青 National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China

Controlling architecture of hierarchical microstructures in liquid crystals(LCs]plays a crucial role in the development of novel soft-matter-based *** LC fingerprints are considered as a prospective candidate for various applications;however,the efficient and real-time command of fingerprint landscapes still needs to be ***,we achieve elaborate rotational fingerprint superstructures via dual photopatterning semifree chiral LC films,which combine the photoalignment technique and a dynamic light patterning *** intriguing spatial-temporal rotational behavior is presented during the patterning of chiral *** work opens new avenues for the applications of chiral LCs in soft actuators,sensing,and micromanufacturing.

关键词： liquid crystal photoalignment fingerprints chiral photoresponsive materials

来源：评论

学校读者我要写书评

暂无评论

Design Knowledge Perception and Representation Method for User Requirements 6

Design Knowledge Perception and Representation Method for Us...

引用

6th IEEE International Conference on Knowledge Innovation and Invention, ICKII 2023

作者： Fan, Guoliang Yu, Xiaoyi Gao, Yaqiong Lu, Xiaoping Jiang, Zuhua Shanghai Jiao Tong University Shanghai Key Lab of Advanced Manufacturing Environment SJTUSME-COSMOPlat Joint Research Center for New Generation Industrial Intelligent Technology School of Mechanical Engineering Shanghai200240 China Shanghai Jiao Tong University State Key Laboratory of Massive Personalized Customization System and Technology SJTUSME-COSMOPlat Joint Research Center for New Generation Industrial Intelligent Technology School of Mechanical Engineering Qingdao266100 China

ISBN: (纸本)9798350323535

The user's requirements for product design include descriptiveness, dynamics, and personalization. The insufficient mapping of User requirement knowledge seriously affects the accuracy of designers' grasp of design ideas and design knowledge. For this issue, we proposed a design knowledge perception and representation method for user requirements. Design knowledge from user requirement question and answer (Q&A) was extracted, including design theme, design content, and design evaluation to improve communication efficiency between designers and users. A representation method was proposed for User requirement knowledge based on the Q&A of the user's initiating requirements and the product provider's solutions. A design requirement framework for expressing design intent was proposed by perceiving dialogue context. Furthermore, the rule of design requirement was derived based on attributes in User requirement knowledge for designers. Finally, the knowledge perception, representation method, and knowledge framework of air conditioners were analyzed to determine the knowledge rules. The results indicated that the knowledge perception and representation method proposed in this study accurately reflected User requirement knowledge and provided sufficient knowledge for product design. At the same time, the extracted design requirement was shared among different decision-makers, providing a theoretical basis for group decision-making. © 2023 IEEE.

关键词： Knowledge representation

来源：评论

学校读者我要写书评

暂无评论

Interaction of the Initial β-Mg17Al12 Phase with α-Matrix Grains in the AZ91 Magnesium Alloy During Hot Extrusion

SSRN

引用

SSRN 2025年

作者： Zhao, Dijia Shao, Yuman Lü, Shulin Yan, Zhaoxiang Guo, Wenbo Li, Shilong Li, Jianyu Xu, Shiwei Wu, Shusen Nie, Jianfeng State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Department of Materials Science and Engineering Monash University VIC3800 Australia

Secondary phase particles in magnesium alloys can facilitate particle-stimulated nucleation and pinning the grain boundary migration during the dynamic recrystallization (DRX) process. But a conflict exists between these two effects. By optimizing the hot extrusion process and preserving the irregular island-shaped β-Mg17Al12 phase (β-phase) derived from the eutectic reaction in the AZ91 magnesium alloy billet, we revealed the interaction of the initial β-phase with the α-matrix during extrusion. In the early stages of extrusion, the irregular, island-shaped, coarse β-phase causes significant dislocation accumulation in the adjacent α-matrix due to the hardness difference. As dislocations accumulate, the β-phase fragments and transforms into spindly fibrous bands, effectively illustrating a pinning effect. The morphological change of the β-phase not only promotes the DRX process but also inhibits the growth of DRXed grains, thereby refining the grain size. This research helps to expand the design strategies for extruded magnesium alloys. © 2025, The Authors. All rights reserved.

关键词： Magnesium alloys

来源：评论

学校读者我要写书评

暂无评论

Au23（CR）14 nanocluster restores fibril Aβ's unfolded state with abolished cytotoxicity and dissolves endogenous Aβplaques

引用

National Science Review 2020年第4期7卷 763-774页

作者： Wenkang Zhang Guanbin Gao Zhongjie Ma Zhuoying Luo Meng He Taolei Sun State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology

The misfolding of amyloid-β（Aβ） peptides from the natural unfolded state to β-sheet structure is a critical step, leading to abnormal fibrillation and formation of endogenous Aβ plaques in Alzheimer's disease（AD）. Previous studies have reported inhibition of Aβ fibrillation or disassembly of exogenous Aβ fibrils in vitro. However, soluble Aβ oligomers have been reported with increased cytotoxicity; this might partly explain why current clinical trials targeting disassembly of Aβ fibrils by anti-Aβ antibodies have failed so *** we show that Au23（CR）14(a new Au nanocluster modified by Cys-Arg（CR） dipeptide) is able to completely dissolve exogenous mature Aβ fibrils into monomers and restore the natural unfolded state of Aβ peptides from misfolded β-sheets. Furthermore, the cytotoxicity of Aβ40fibrils when dissolved by Au23（CR）14is fully abolished. More importantly, Au23（CR）14is able to completely dissolve endogenous Aβ plaques in brain slices from transgenic AD model mice. In addition, Au23（CR）14has good biocompatibility and infiltration ability across the blood–brain barrier. Taken together, this work presents a promising therapeutics candidate for AD treatment, and manifests the potential of nanotechnological approaches in the development of nanomedicines.

关键词： gold nanoclusters Alzheimer’s disease restores fibril Aβ’s unfolded state abolished cytotoxicity dissolves endogenous Aβ plaques

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：