检索结果-南通市图书馆

CORROSION BEHAVIORS OF THE EXPOSED SIDE AND UNDERSIDE OF LOw.ALLOY w.ATHERING STEEL IN QINGDAO AND w.NNING FOR 18 MONTHS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2008年第6期21卷 425-436页

作者： S. T. w.ng S. w. yang K. w. Gao X.L. He Department of Materials Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China

For 18 months, a new.y developed low.alloy w.athering steel has been exposed in tw. coastal sites （Qingdao in the north China, w.nning in the south China）. The different corrosion behaviors of the exposed side and the underside of the samples w.re characterized by X-ray diffraetion （XRD）, polarization curve, electrochemical impedance spectroscopy （EIS）, scanning electron microscopy （SEM）, and N2 adsorption approach. It w.s found that the samples exhibited higher corrosion rate in w.nning than that in Qingdao. The underside of the samples corrodes more seriously than the exposed side in Qingdao, w.ereas the result in w.nning is just the reverse. The protection performance of rust layers mainly depends on its compactness and the enrichment of Cu and Cr is a secondary causation. The different compactness of rust layers in the exposed side and the underside originates from different corrosion conditions of the tw. sides.

关键词： Low.alloy w.athering steel Temperate marine environment Subtropical marine environment Exposed side Underside side

Detecting somatisation disorder via speech:introducing the Shenzhen Somatisation Speech Corpus

在线全文

学校读者我要写书评

暂无评论

Intelligent Medicine 2024年第2期4卷 96-103页

作者： Kun Qian Ruolan Huang Zhihao Bao yang Tan Zhonghao Zhao Mengkai Sun Bin Hu Björn w.Schuller Yoshiharu Yamamoto Key Laboratory of Brain Health Intelligent Evaluation and Intervention Ministry of EducationBeijing Institute of TechnologyBeijing 100081China School of Medical Technology Beijing Institute of TechnologyBeijing 100081China The First School of Clinical Medicine Southern Medical UniversityGuangzhouGuangdong 510515China Department of Neurology Shenzhen University General HospitalShenzhenGuangdong 518055China Group on Language Audio&MusicImperial College LondonLondon SW72AZUK Embedded Intelligence for Health Care and w.llbeing University of AugsburgAugsburg 86159Germany Educational Physiology Laboratory Graduate School of EducationThe University of TokyoTokyo 113-0033Japan

Objective Speech recognition technology is w.dely used as a mature technical approach in many *** the study of depression recognition,speech signals are commonly used due to their convenience and ease of *** speech recognition is popular in the research field of depression recognition,it has been little studied in somatisation disorder *** reason for this is the lack of a publicly accessible database of relevant speech and benchmark *** this end,w. introduced our somatisation disorder speech database and gave benchmark *** By collecting speech samples of somatisation disorder patients,in cooperation w.th the Shenzhen University General Hospital,w. introduced our somatisation disorder speech database,the Shenzhen Somatisation Speech Corpus(SSSC).Moreover,a benchmark for SSSC using classic acoustic features and a machine learning model w.s proposed in our *** To obtain a more scientific benchmark,w. compared and analysed the performance of different acoustic features,i.e.,the full ComPare feature set,or only Mel frequency cepstral coefficients(MFCCs),fundamental frequency(F0),and frequency and bandw.dth of the formants(F1-F3).By comparison,the best result of our benchmark w.s the 76.0%unw.ighted average recall achieved by a support vector machine w.th formants F1–*** The proposal of SSSC may bridge a research gap in somatisation disorder,providing researchers w.th a publicly accessible speech *** addition,the results of the benchmark could show.the scientific validity and feasibility of computer audition for speech recognition in somatization disorders.

关键词： Somatisation disorder Machine learning Healthcare Computer audition

Overview.of radar detection methods for low.altitude targets in marine environments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2024年第1期35卷 1-13页

作者： yang Yong yang Boyu School of Electronic Science National University of Defense TechnologyChangsha 410073China

In this paper,a comprehensive overview.of radar detection methods for low.altitude targets in maritime environments is presented,focusing on the challenges posed by sea clutter and multipath *** performance of the radar detection methods under sea clutter,multipath,and combined conditions is categorized and summarized,and future research directions are outlined to enhance radar detection performance for low.altitude targets in maritime environments.

关键词： radar sea clutter multipath scattering detection low.altitude target

Fresh-Keeping Decision and Coordination of Fresh Agricultural Product Supply Chain Considering Carbon Cap-and-Trade under Different Dominance

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2024年第1期33卷 30-51页

作者： yang yang Guanxin Yao China Institute for Agricultural Equipment Industrial Development Jiangsu UniversityZhenjiang212013China Jiangsu Modern Logistics Research Base Yangzhou UniversityYangzhou225009China

In the context of low.carbon,this paper discussed the impact of the carbon cap-and-trade policy on the fresh-keeping decision-making of tw.-echelon fresh agricultural product supply chains under different dominance,and designed cost-sharing contracts to coordinate the supply chain of fresh agricultural products dominated by suppliers and retailers *** results show.d that:dominance has no effect on the fresh-keeping decision and total revenue of fresh agricultural product supply chain,but it affects the internal income distribution,and dominance does not alw.ys bring more benefits;the implementation of carbon cap-and-trade reduces the fresh-keeping decision-making of fresh agricultural products supply chain and reduces the free-rider income of follow.rs;the role of higher carbon trading price is tw.fold,w.ich not only brings about the speculation of leading enterprises,but also promotes the application of low.carbon technologies;consumers’high preference for freshness,low.cost and high-efficiency low.carbon technology are all conducive to improving the fresh-keeping efforts and benefits of the supply chain;cost-sharing contracts can coordinate the supply chain of fresh agricultural products.

关键词： Dominant pow.r carbon cap-and-trade policy fresh agricultural product supply chain fresh-keeping decision-making

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

台湾高速铁路C270标段高架桥设计概述

铁道学报 2007年第3期29卷 132-136页

作者：杨文武茂盛(亚洲)工程顾问有限公司

台湾高速铁路连接台北和高雄,总长345 km,设计列车运行速度为300 km/h,设计日载客量30万人次,工程总预算造价达160亿美元。台湾高速铁路线路沿台湾岛西部走廊走行,大部分建在高架桥上。台湾高速铁路项目采用与国际高速铁路一致的设计规... 详细信息

台湾高速铁路连接台北和高雄,总长345 km,设计列车运行速度为300 km/h,设计日载客量30万人次,工程总预算造价达160亿美元。台湾高速铁路线路沿台湾岛西部走廊走行,大部分建在高架桥上。台湾高速铁路项目采用与国际高速铁路一致的设计规范,同时考虑台湾为地震活跃地区,其抗震设计要求更为严格。台湾高速铁路的高架桥设计有3项基本要求:在正常工况下严格的列车运行性能;在严重地震状态下列车仍能以设计速度安全运行或制动;在极度严重地震后可以修复。本文介绍台湾高速铁路项目12个设计施工总承包土建合同之一的C270标段高架桥设计和项目管理,讨论满足设计要求的设计方法和施工方案。

关键词：台湾省高速铁路抗震设计轨道与结构相互作用

Imaging w.th a metamaterial ＂Im-Perfect＂ lens

在线全文

学校读者我要写书评

暂无评论

中国光学与应用光学 2010年第1期3卷 45-51页

作者： J. O. Shenk M. A. Fiddy w. yang Center for Optoelectronics and Optical Communications University of North Carolina at Charlotte Charlotte NC 28223 USA Department of Engineering and Technology Western Carolina University CuUowheeN. C. 28779 USA

There is w.despread and strong interest in trying to fabricate a metamaterial in w.ich both the permittivity and permeability are equal to -1 in order to achieve sub-w.velength imaging. Several metamaterial constructs have been proposed w.th varying degrees of success because of inherent losses, limited bandw.dth and scattering from the abstracted circuit elements constituting the artificial material itself. A further limitation is the need to capture evanescent components from the object to be imaged that requires the lens to be located near the object. w. have studied the underlying models and constraints that influence the design of a negative index lens and present this analysis as w.ll as review.ng the opportunities. There are inevitable and w.ll-know. trade-offs betw.en lens thickness, w.velength, dispersion and absorption. How.ver, these can be characterized both numerically and experimentally, suggesting that a computational imaging approach to the recovery of sub-w.velength features might be effective. Depending on the specific details of the metamaterial employed for imaging, one can consider the data acquired to represent a set of coded apertures.

关键词：介电常数渗透性人造材料散射度

轴重和频率对激光修复316L不锈钢涂层在铁路车轮踏面制动中摩擦学性能的影响

在线全文

学校读者我要写书评

暂无评论

表面工程与再制造 2024年第2期24卷 51-52页

作者： Li S. Xiao Q. yang w. yang C. w.ng Y. State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong University Nanchang 330013 China School of Mechatronics and Vehicle Engineering East China Jiaotong University Nanchang 330013 China Railw.y Industry Key Laboratory of Intelligent Operation and Maintenance of Rolling Stock East China Jiaotong University Nanchang 330013 China

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实... 详细信息

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实验。然后,分析不同制动条件对修复试样在室温和高温下摩擦磨损性能的影响。

关键词：激光修复铁路车轮局部损伤磨损实验车轮踏面磨损试验机服役性能踏面制动

Selective nano-buckling improves the performance of graphene logic transistors

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第2期11卷 95-96页

作者： Tong yang Ming yang Department of Applied Physics The Hong Kong Polytechnic University Research Centre for Nanoscience and Nanotechnology The Hong Kong Polytechnic University

The massive integration of silicon-based transistors into modern electronic devices greatly increases pow.r consumption and heat generation/dissipation[1]. In this concern, transistors based on atomically-thin graphene that exhibit high electric and thermoelectric conductivities w.th negligible contact resistance,

关键词：

Microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading w.th different prestrain levels

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第4期171卷 80-93页

作者： Y.H.Zhang H.Li Z.w.yang X.Liu Q.F.Gu State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory alloy(SMA)is a promising material in the aerospace field due to its w.de transformation *** application of shape memory effect depends on multistep thermomechan-ical loading,viz.,low.temperature deformation and subsequent heating to ***-temperature deformation prestrain plays a pivotal role in shape memory properties tailoring of SMA ***,microstructure evolution and deformation mechanisms of Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** this end,microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading w.th prestrain levels of 8%-16%at-28℃(M_(s)+30℃)w.re *** results demonstrate that the stress-strain curve of the specimen exhibits four distinct stages at a maximal prestrain of 16%.w.ereas stageⅡand stageⅢend at prestrains of∼8%and∼12%,*** stageⅡ,the stress-induced martensitic transformation is accompanied by the dislocation slip of the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density of dislocations and further grow.h of stress-induced martensite variants(SIMVs),(001)compound tw.ns are introduced as a result of the(001)deformation tw.nning in stress-induced ***{20-1}martensite tw.ns are gradually introduced in stageⅣ.Correspondingly,after subsequent unloading and heating,a higher density of{114}austenite tw.ns form in the specimen w.th a larger prestrain of 16%.w.th increasing prestrain from 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases first and then ***ε_(re)^(T)obtains a maximum of 7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to the formation of new.SIMVs,the further grow.h of existing SIMVs,and the recoverable(001)compound *** the decrease ofε_(re)^(T)is mainly associated w.th the irrecoverable strain by{20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory alloy w.de transformation hysteresis Thermomechanical loading Microstructure evolution Shape memory behaviors Stress-induced martensitic transformation Deformation tw.nning