检索结果-南通市图书馆

Robust interface and excellent as-built mechanical properties of Ti–6Al–4V fabricated through laser-aided additive manufacturing with powder and wire

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 154-168页

作者： Fei Weng Guijun bi Youxiang Chew Shang Sui Chaolin Tan Zhenglin Du Jinlong Su Fern Lan Ng Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong Engineering&Technology Research Center for Superhard MaterialSchool of Materials Science and EngineeringShandong UniversityJinan 250061China Institute of Intelligent Manufacturing Guangdong Academy of SciencesGuangzhou 510095China Singapore Institute of Manufacturing Technology 5 Cleantech Loop636732Singapore

The feasibility of manufacturing Ti-6Al-4V samples through a combination of laser-aided additive manufacturing with powder(LAAM_(p))and wire(LAAM_(w))was explored.A process study was first conducted to successfully circumvent defects in Ti-6Al-4V deposits for LAAM_(p) and LAAM_(w),*** the optimized process parameters,robust interfaces were achieved between powder/wire deposits and the forged substrate,as well as between powder and wire *** characterization results revealed the epitaxial prior β grains in the deposited Ti-6Al-4V,wherein the powder deposit was dominated by a finerα′microstructure and the wire deposit was characterized by lamellar α *** mechanisms of microstructure formation and correlation with mechanical behavior were analyzed and *** mechanical properties of the interfacial samples can meet the requirements of the relevant Aerospace Material Specifications(AMS 6932)even without post heat *** fracture occurred within the interfacial area,further suggesting the robust *** findings of this study highlighted the feasibility of combining LAAM_(p) and LAAM_(w) in the direct manufacturing of Ti-6Al-4V parts in accordance with the required dimensional resolution and deposition rate,together with sound strength and ductility balance in the as-built condition.

关键词： laser-aided additive manufacturing powder deposition wire deposition interfacial characteristic mechanical behavior

Cortico-striatal gamma oscillations are modulated by dopamine D3 receptors in dyskinetic rats

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1164-1177页

作者： Pengfei Wang Yuewei bi Min Li Jiazhi Chen Zhuyong Wang Huantao Wen Ming Zhou Minjie Luo Wangming Zhang Neurosurgery Center Department of Pediatric NeurosurgeryGuangdong Provincial Key Laboratory on Brain Function Repair and RegenerationZhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina

Long-term levodopa administration can lead to the development of levodopa-induced *** oscillations are a widely recognized hallmark of abnormal neural electrical activity in levodopa-induced ***,studies have reported increased oscillation power in cases of levodopa-induced ***,little is known about how the other electrophysiological parameters of gamma oscillations are altered in levodopa-induced ***,the role of the dopamine D3 receptor,which is implicated in levodopa-induced dyskinesia,in movement disorder-related changes in neural oscillations is *** found that the cortico-striatal functional connectivity of beta oscillations was enhanced in a model of Parkinson’s ***,levodopa application enhanced cortical gamma oscillations in cortico-striatal projections and cortical gamma aperiodic components,as well as bidirectional primary motor cortex(M1)↔dorsolateral striatum gamma *** of PD128907(a selective dopamine D3 receptor agonist)induced dyskinesia and excessive gamma oscillations with a bidirectional M1↔dorsolateral striatum ***,administration of PG01037(a selective dopamine D3 receptor antagonist)attenuated dyskinesia,suppressed gamma oscillations and cortical gamma aperiodic components,and decreased gamma causality in the M1→dorsolateral striatum *** findings suggest that the dopamine D3 receptor plays a role in dyskinesia-related oscillatory activity,and that it has potential as a therapeutic target for levodopa-induced dyskinesia.

关键词： aperiodic components dopamine D3 receptor dorsolateral striatum functional connectivity gamma oscillations levodopa-induced-dyskinesia local field potentials neuromodulation Parkinson’s disease primary motor cortex

在线全文

学校读者我要写书评

暂无评论

从家庭视角看中国女性劳动参与率的下降趋势

武汉大学学报（哲学社会科学版） 2025年第1期78卷 133-145页

作者：赵耀辉毕汝岱武汉大学武汉大学董辅礽经济社会发展研究院湖北武汉430072 北京大学国家发展研究院北京100091

随着社会经济的发展和人口结构的深刻调整,中国女性劳动参与率发生了显著变化。改革开放初期,中国女性劳动参与率显著高于欧美主要发达国家的水平,但近年来大幅下降,已接近其平均值。研究发现,已生育女性劳动参与率的下降是整体趋势的... 详细信息

随着社会经济的发展和人口结构的深刻调整,中国女性劳动参与率发生了显著变化。改革开放初期,中国女性劳动参与率显著高于欧美主要发达国家的水平,但近年来大幅下降,已接近其平均值。研究发现,已生育女性劳动参与率的下降是整体趋势的主要驱动力,而婚育模式的转变在一定程度上对这一趋势起到了缓冲作用。对于已婚女性而言,学龄前子女的照料负担逐渐成为劳动市场参与的核心制约因素。女性教育水平的提升通过禀赋和系数效应显著促进了劳动参与,但配偶教育水平的影响由正向转为负向,说明家庭收入能力的提高减弱了女性劳动参与的经济动机,强化了性别分工的传统趋势。优化育儿支持体系、促进性别平等以及营造职场友好环境,是缓解婚育负担对女性劳动市场参与约束的关键政策方向。

关键词：女性劳动参与率婚育模式育儿成本

Absorption-dominant EMI shielding performance of multiple folded bi_(2)Se_(3)/PVDF nanocomposite films

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2024年第1期10卷 27-36页

作者： Xinyi Pu Zunpeng Feng Siyuan Sun Ke bi Yanan Hao State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing100876China Chinese Academy of Engineering Innovation Strategy Beijing100088China

Absorption-dominant electromagnetic interference(EMI)shielding materials are promising in reducing electromagnetic radiation pollution,but their preparation processes are usually difficult and unsuitable for large-scale *** this work,multiple folded bi_(2)Se_(3)/PVDF nanocomposite films were fabri-cated by using a convenient tape-casting method and multiple folding,which can be easily extended in industrial *** EMI shielding effectiveness(SE)of the composite materials was investigated,which shows typical absorption-dominant behavior and can substantially reduce secondary ***,for the 35%(in volume)bi_(2)Se_(3)/PVDF nanocomposite film,the SE_(A)of single-layered film with a thickness of 60 mm reaches 20 dB while SE_(R)is lower than 5 *** folding the film into eight layers,the SE_(A)increased to 50 dB while SE_(R)remains below 5 *** method provides an effective way to the fabrication of absorption-dominant electromagnetic absorption(EMA)and EMI shielding material.

关键词： Electromagnetic interference shielding(EMI) Electromagnetic wave absorption bismuth selenide Composite

Improved closed-loop tracking interferometer measurement for a five-axis machine tool with a bi-rotary milling head

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2022年第5期65卷 1127-1136页

作者： TANG XinYu XU Kun bi QingZhen SONG ZhiYong JI YuLei QIAN DeHou State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai200240China AVIC Chengdu Aircraft Industrial(Group)Co. Ltd.Chengdu610092China Shanghai TOP Numerical Control Technology Co. Ltd.Shanghai201100China

Tracking interferometer based on bi-rotary milling head is a novel scheme to conduct volumetric accuracy measurement of a five-axis machine *** laser beam direction of the interferometer can be regulated to follow the retroreflector by moving the bi-rotary *** is a low-cost implementation of multilateration measurement,and its measurement accuracy is mainly affected by the error motion of the rotary *** paper proposes an improved multilateration principle to identify the positionindependent geometric errors of rotary axis and laser beam,and minimize their impact on the measurement uncertainty.A closed-loop tracking interferometer system installed on the spindle is developed to perform the measurement with high tracking *** device can be installed on an ordinary five-axis machine tool without modifying the machine tool *** proposed scheme is conducive to improving the accuracy and practical application of the tracking interferometer based on birotary milling *** with the corresponding closed-loop tracking interferometer and uncertainty analysis are conducted to verify the performance of the proposed measurement scheme.

关键词： tracking interferometer multilateration volumetric accuracy five-axis machine tools

ROBUST H∞ CONTROL FOR UNCERTAIN NONLINEAR SYSTEMS

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2007年第4期20卷 545-553页

作者： Weiping bi College of Mathematics and Information Science Henan Normal University Xinxiang 453007. China

This paper studies the robust H∞ disturbance attenuation with internal stability for uncertain nonlinear control systems. By adding one power integrator technique, this paper designs a explicit smooth robust dynamic feedback law while rejecting the disturbance to any specified degree of accuracy. Further, the example and simulation results show the effectiveness of the proposed schemes.

关键词： Internal stability robust dynamic feedback specified degree.

Fluctuation of Quantum Information Density in Curved Time-Space

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2007年第4期24卷 859-862页

作者： bi Qiao Department of Physics Wuhan University of Technology Wuhan 430070 Center of Advanced Nanotechnology University of Toronto M5S 3E4 Canada

A dynamical equation for quantum information density （QID） in curved spacetime is presented. The related fluctuation of QID with quantum Einstein equation is also discussed, which reveals the measuring of the dynami... 详细信息

关键词： Fluctuation of Quantum Curved Time-Space

A novel iterative soft thresholding algorithm for L1 regularization based SAR image enhancement

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第4期62卷 212-214页

作者： Hui bi Guoan bi College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics School of Electrical and Electronic Engineering Nanyang Technological University

Dear editor,Synthetic aperture radar(SAR) is an active microwave device which transmits and receives electromagnetic waves to achieve high-resolution imaging of the surveillance region by using matched filtering(MF) b... 详细信息

关键词： SAR A novel iterative soft thresholding algorithm for L1 regularization based SAR image enhancement

INTROMISSION OF WATER-REPELLENT AND HYDROSCOPIC PROPERTIES SIMULTANEOUSLY TO PP BY PLASMA DISCHARGE METHOD

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2005年第1期23卷 83-92页

作者： JieLiang bi-qianLiu InstituteofChemistry ChineseAcademyofSciencesBeijing100080China

Plasma-induced surface graft copolymerization of acrylic acid on polypropylene non-woven fabric(PP-g-AA)andpolypropylene membrane were *** extents of grafting were controlled by the plasma and *** ammonium bromide was then coupled with the carboxyl group of PP-g-AA to obtain apolyion complex(PIC).At last,CF_4 plasma was used to give PICs hydrophobic *** moisture regain and water-repellency of the processed PICs was *** surfaces were characterized using ATR FT-IR and *** resultindicates that the products have very high ability to adsorb moisture,even better than cotton *** the same time,theproducts show excellent hydrophobic property,which can't be wetted by those reagents whose surface tensions were higherthan 327 mN/m.

关键词： Polypropylene non-woven fabric Plasma-induced grafting Hexadecyltrimethyl ammonium bromide CF_4 plasma treatment Moisture sorption Hydrophobicity.