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Cu-Cu low-temperature diffusion bonding by spark plasma sintering:Void closure mechanism and mechanical properties

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Journal of Materials Science & Technology 2023年第8期139卷 210-223页

作者： Wendi Li yuxin liang Yang Bai Tiesong Lin Bangsheng Li Jicai Feng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China

In this study,combining the single point diamond turning(SPDT)and spark plasma sintering(SPS),we achieved high-strength diffusion bonding of copper at an ultra-low temperature of 202℃(0.35 T_(m),T_(m):absolute temperature of the melting point).Additionally,the closure mechanism of interfacial micro-and nano-voids during the Cu-Cu SPS diffusion bonding is systematically revealed for the first *** micro-voids,the pulsed current is found to induce additional diffusion flux and plastic deformation,thereby facilitating the void *** dynamics(MD)simulation revealed that at the atomic scale,high-energy Cu atoms induced by the pulsed current can significantly promote the diffusion of low-energy atoms in their vicinity and accelerate the void *** study also proposes a novel“evaporation-deposition”nano-void closure mechanism for the previously unstudied nano-void closure *** results show that the synergistic effect of the pulsed current and nanoscale surface rough-ness can significantly improve joint *** a low temperature of 405℃(0.5 T_(m)),on combining the computerized numerical control(CNC)turning and SPS diffusion bonding,the joint strength can reach 212 MPa,while that for the joint obtained by traditional hot pressing diffusion bonding at the same tem-perature is only 47 *** obtained an ultra-high joint strength of 271 MPa using the combined process of SPDT and SPS diffusion bonding at an ultra-low temperature of 202℃(0.35 T_(m)),which is approximately 600℃ lower than the traditional diffusion bonding process temperature of 800℃(0.79 T_(m)).To sum up,this study provides a novel method and theoretical support for realizing low-temperature high-strength diffusion bonding.

关键词： Spark plasma sintering Diffusion bonding Void closure mechanism Mechanical property Molecular dynamics

Evaluation and Analysis of the Effect of Lignin Amelioration on Loess Collapsibility

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Journal of Renewable Materials 2022年第12期10卷 3405-3424页

作者： Xiumei Zhong yuxin liang Qian Wang Jinlian Ma Shouyun liang Yan Wang Xiaowei Xu Key Laboratory of Loess Earthquake Engineering China Earthquake Administration&Gansu Provincelanzhou730000China Department of Civil Engineering and Mechanics Lanzhou UniversityLanzhou730000China

The road subgrade and road surface in collapsible loess area are prone to many engineering diseases such as uneven subgrade settlement,insufficient bearing capacity of soaked foundation,collapse and instability of sub-grade side slope due to the special properties of *** an environment-friendly,low-cost soil modifier with good adhesion and chelation properties,lignin has been considered to be used in highway subgrade *** order to explore the effect of lignin on loess,the compressive and collapsible properties of modified loess with different lignin contents were analyzed based on consolidation compression *** improvement mechanism of lignin on loess collapsibility was studied by means of infiltration test and SEM *** results show that lignin fibers can promote the agglomeration of loose particles and form a network structure in the soil particle pores,enhance the cementation strength between particles and soil skeleton,and reduce the permeability of *** the increase of lignin fiber content,the improvement degree of loess collaps ility shows a trend of first increasing and then *** the lignin fiber content is 2%,the effect is the best,and the improved loess ollapsi-bility is eliminated.

关键词： Collapsible loess lignin distribution characteristics of pore particles SEM permeability characteristics

Polymer Integrated Waveguide Optical Biosensor by Using Spectral Splitting Effect

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Photonic Sensors 2017年第2期7卷 131-139页

作者： Xiaonan HAN Xiuyou HAN Yuchen SHAO Zhenlin WU yuxin liang Jie TENG Shuhui BO Geert MORTHIER Mingshan ZHAO School of Physics and Optoelectronic Engineering Dalian University of Technology Dalian 116024 China No. 38 Research Institute China Electronics Technology Group Corporation Hefei 230088 China Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Photonics Research Group Department of Information Technology Ghent University-IMEC 9000 Ghent Belgium

The polymer waveguide optical biosensor based on the Mach-Zehnder interferometer （MZI） by using spectral splitting effect is investigated. The MZI based biosensor has two unequal width sensing arms. With the different mode dispersion responses of the two-arm waveguides to the cladding refractive index change, the spectral splitting effect of the output interference spectrum is obtained, inducing a very high sensitivity. The influence of the different mode dispersions between the two-arm waveguides on the spectral splitting characteristic is analyzed. By choosing different lengths of the two unequal width sensing arms, the initial dip wavelength of the interference spectrum and the spectral splitting range can be controlled flexibly. The polymer waveguide optical biosensor is designed, and its sensing property is analyzed. The results show that the sensitivity of the polymer waveguide optical biosensor by using spectral splitting effect is as high as 10^4nm/RIU, with an improvement of 2-3 orders of magnitude compared with the slot waveguide based microring biosensor.

关键词： Optical biosensor integrated waveguide spectral splitting sensitivity

An integrated single-shot spectrometer with large bandwidth-resolution ratio and wide operation temperature range

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PhotoniX 2023年第1期4卷 172-187页

作者： Ang Li Chang Wang Feixia Bao Wenji Fang yuxin liang Rui Cheng Shilong Pan Key Laboratory of Radar Imaging and Microwave Photonics Ministry of EducationNanjing University of Aeronautics and AstronauticsNanjing 210016China United Microelectronics Center Chongqing 40030China School of Instrument Science and Opto-Electronics Engineering Hefei University of TechnologyHefeiAnhui 230009China

There has been a rapidly growing demand for low-cost,integrated single-shot spectrometers to be embedded in portable intelligent *** though significant progress has been made in this area,two major problems are still remaining,namely the high temperature sensitivity and poor bandwidth-resolution ratio(BRR)that can’t meet the requirement of most *** this work,we present an integrated single-shot spectrometer relying on a silicon photonic circuit that has a footprint less than 3mm2,but could achieve broad operation bandwidth about 100 nm and high resolution up to 0.1 nm(with a BRR~1000).Moreover,for the first time,we demonstrate an integrated spectrometer that could operate within a wide temperature range(between 10 and 70 degrees Celsius)without additional power consumption for temperature management.

关键词： Optical spectrometers Silicon photonics Computational spectrometers Photonic integrated circuits

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我国农村人力资源开发存在的问题与对策思考

生产力研究 2007年第9期 20-22页

作者：梁玉新中共山西省委党校省直分校山西太原030021

开发农村人力资源是实现农业现代化的客观需要,是全面建设小康社会的内在要求,也是建设社会主义新农村的关键所在。当前我国农村人力资源开发中存在的主要问题是农民收入有限、劳动力素质较低、劳动力相对过剩、政府对农村人力资本投资... 详细信息

开发农村人力资源是实现农业现代化的客观需要,是全面建设小康社会的内在要求,也是建设社会主义新农村的关键所在。当前我国农村人力资源开发中存在的主要问题是农民收入有限、劳动力素质较低、劳动力相对过剩、政府对农村人力资本投资不足、乡镇企业吸纳劳动力的能力减弱、加入世贸组织带来的冲击直接影响农业吸纳劳动力的能力等。大力开发农村人力资源,需要采取政府重视、提高农民收入、深化教育体制改革、推进城镇化进程、加大农村教育投资、开拓国际劳务市场、建设农村人力资源开发体系等对策措施。

关键词：农村人力资源开发问题对策

Networked Quadrotor Predictive Control Based on Identified Models

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Networked Quadrotor Predictive Control Based on Identified M...

第37届中国控制会议

作者： yuxin liang Guo-Ping Liu Zhonghua Pang Center for Control Theory and Guidance Technology Harbin Institute of Technology School of Engineering University of South Wales Key Laboratory of Fieldbus Technology and Automation of Beijing North China University of Technology

In order to achieve good performance of controlling quadrotors with networked delays, this paper firstly proposes a novel experimental architecture aiming to boost the whole process of the experiment and save expenses. Secondly, different from traditional methods of mathematical modelling, the models adopted in this paper are identified rather than derived or calculated using measured systematic parameters. Thirdly, the dynamic models of the system need to be verified before implemented into further experiments. Finally, based on the classic scheme of a proportional-integral-derivative（PID） control algorithm, a predictive PID controller is designed for quadrotor trajectory tracking, and the results show that the designed controller can fulfill the task of tracking with time delays.

关键词： Quadrotor predictive PID controller model identification

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新出《阎用之墓志》及阎氏家族源流事迹考释

文博 2020年第6期 82-91页

作者：梁雨昕陕西师范大学历史文化学院陕西西安710062

阎用之系阎立德曾孙,主要生活于唐玄宗朝,幼年幸免于阎知微案的牵连;青年曾出使西域,化干戈为玉帛;中年三任诸卫将军、两任王傅,忠心耿耿,恪尽职守,卫禁皇帝,极言直谏;晚年遭逢安史之乱,为叛军所获,又侥幸保全。阎用之一生经历曲折,与... 详细信息

阎用之系阎立德曾孙,主要生活于唐玄宗朝,幼年幸免于阎知微案的牵连;青年曾出使西域,化干戈为玉帛;中年三任诸卫将军、两任王傅,忠心耿耿,恪尽职守,卫禁皇帝,极言直谏;晚年遭逢安史之乱,为叛军所获,又侥幸保全。阎用之一生经历曲折,与盛唐时期诸多史事与制度变化息息相关,通过此方墓志亦可略窥出自鲜卑的河南阎氏一族自北魏至唐代身份认同与文化选择不断变化的轨迹。

关键词：阎用之墓志阎立德鲜卑家族

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细胞膜上信号转导蛋白的单分子成像与分析

高等学校化学学报 2020年第6期41卷 1127-1138页

作者：梁钰昕赵容梁馨月方晓红中国科学院化学研究所分子纳米结构与纳米技术重点实验室北京分子科学国家研究中心北京100190

结合本课题组的研究工作,介绍了单分子荧光成像原理、荧光标记方法及数据分析方法,并进一步综述了单分子荧光成像在几种重要的膜蛋白信号转导分子机制和相关药物研究中的进展.

关键词：单分子荧光成像细胞膜受体全内反射荧光显微镜超分辨成像单分子分析

Transmembrane Protein 170B is a Prognostic Biomarker and Associated with Immune Infiltrates in Pancreatic Adenocarcinoma

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Transmembrane Protein 170B is a Prognostic Biomarker and Ass...