检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

高强H形钢混凝土组合柱轴压性能研究

建筑结构学报 2022年第9期43卷 191-200页

作者：王钧苏宇赵金友王欣然孙文泽东北林业大学土木工程学院黑龙江哈尔滨150040 上海应用技术大学城市建设与安全工程学院上海201418

为研究高强H形钢混凝土组合柱的轴心受压性能以及探究国内外现行规范对此类构件承载力计算方法的适用性,对12根内置Q460、Q690高强H形钢混凝土组合柱及3根内置Q235普通H形钢混凝土组合柱进行轴压试验,研究钢材强度等级、含钢率、长细比... 详细信息

为研究高强H形钢混凝土组合柱的轴心受压性能以及探究国内外现行规范对此类构件承载力计算方法的适用性,对12根内置Q460、Q690高强H形钢混凝土组合柱及3根内置Q235普通H形钢混凝土组合柱进行轴压试验,研究钢材强度等级、含钢率、长细比和配箍率等参数对构件承载力的影响。试验结果表明:内置Q460、Q690高强H形钢混凝土组合柱与内置Q235普通H形钢混凝土组合柱相比,承载力最大提高幅度分别为19.6%和35.8%;高强H形钢含钢率的提升能显著提高组合柱的承载力;当组合柱长细比在23.0~45.9范围变化时,其对承载力影响不明显;提高配箍率对内置Q690的H形钢混凝土组合柱承载力的提高幅度高于内置Q460的H形钢混凝土组合柱。将试验结果与我国JGJ 138—2016《组合结构设计规范》、美国ANSI/AISC 360-16和欧洲EN1994-1-1:2004中的H形钢混凝土组合柱轴压承载力公式计算值进行对比可得,各国规范的计算值均偏于保守,JGJ 138—2016的计算值与试验结果最为接近。考虑箍筋对混凝土的约束效应,对JGJ 138—2016的组合柱轴压承载力计算公式进行修正,修正公式所得承载力计算结果与试验结果误差降低至10%以内。基于约束效应建立组合柱有限元模型,考虑约束效应的承载力有限元模拟结果与试验结果吻合良好,误差在5%以内。

关键词：高强钢型钢混凝土组合柱轴压承载力约束效应数值分析

同方期刊数据库

高强H形钢混凝土组合柱偏心受压性能试验研究

在线全文

学校读者我要写书评

暂无评论

建筑结构学报 2022年第10期43卷 249-258页

作者：王钧孙文泽赵金友苏宇王欣然东北林业大学土木工程学院黑龙江哈尔滨150040 上海应用技术大学城市建设与安全工程学院上海201418

为研究高强H形钢混凝土组合柱的偏心受压性能以及验证采用国内外相关规范计算此类构件承载力的可行性,进行了1∶3缩尺的10根内置Q460、Q690高强H形钢混凝土组合柱与2根内置Q235普通H形钢混凝土组合柱的偏心受压试验,研究型钢钢材牌号、... 详细信息

为研究高强H形钢混凝土组合柱的偏心受压性能以及验证采用国内外相关规范计算此类构件承载力的可行性,进行了1∶3缩尺的10根内置Q460、Q690高强H形钢混凝土组合柱与2根内置Q235普通H形钢混凝土组合柱的偏心受压试验,研究型钢钢材牌号、相对偏心距、含钢率与箍筋间距对组合柱偏压承载力与延性的影响。研究结果表明:当型钢钢材牌号由Q235提升至Q460、Q690时,组合柱的承载力和延性均有明显提升,型钢钢材牌号为Q690的组合柱承载力提高幅度略高于Q460的,其位移延性系数提高幅度明显高于Q460的;增大相对偏心距和含钢率可显著提升高强H形钢混凝土组合柱的延性;较小箍筋间距有利于充分发挥Q690高强H形钢的材料性能。将试验结果与按我国JGJ 138—2016《组合结构设计规范》、欧洲EN 1994-1-1:2004以及美国ANSI/AISC360-16得到的型钢组合柱偏压承载力计算结果进行对比。结果表明,按EN 1994-1-1:2004、ANSI/AISC360-16得到的高强H形钢组合柱偏压承载力计算结果与试验结果相差较大,总体上偏于保守;按JGJ 138—2016的计算结果与试验结果相差较小,当相对偏心距为0.2时计算结果总体上偏于安全,相对偏心距为0.6时偏于不安全。

关键词： H形钢混凝土组合柱高强H形钢偏压试验承载力延性规范适用性

Synthesis, Antitumor Activity and Preliminary Structure-activity Relationship of 2-Aminothiazole Derivatives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2016年第6期32卷 929-937页

作者： LI Hongshuang wang xinran DUAN Guiyun XIA Chengcai XIAO Yuliang LI Furong GE Yanqing YOU Guirong HAN Junfen FU Xiaopan School of Pharmaceutical Sciences Taishau Medical University Taian 2 71016 P. R. China

In this paper, we described the synthesis of 2-aminoflfiazole sublibrary containing methyl, bromo, phenylor butylidene at 4- or/and 5-position of its core. All target compounds were evaluated tbr their antitumor activitiesagainst human lung cancer cell line H1299 and human glioma cell line SHG-44. Among the compotmds screened,4,5,6,7-tetrahydrobenzo[d]thiazole（26b） exhibited the most potent antittunor activities with IC50 values of 4.89 and4.03 μmol/L against the two tested cell lines, respectively. Preliminary structure-activity relationship（SAR） studies ofthese compound were subsequently investigated.

关键词： 2-Aminotlfiazole Antitumor activity Structure-activity relationship

人口-经济-住房租赁市场耦合协调研究——以中国35个大中城市为例

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

热带地理 2022年第6期42卷 889-901页

作者：牟玲玲王欣然王晨曦河北工业大学经济管理学院天津300400

城镇化推进过程中,人口流入经济发达的大中城市,而高房价使住房租赁需求日益增加。人口、经济与住房租赁市场相互影响,三系统的协调发展是城市可持续发展的必然要求。在构建人口-经济-住房租赁市场系统评价指标体系的基础上,采用耦合协... 详细信息

城镇化推进过程中,人口流入经济发达的大中城市,而高房价使住房租赁需求日益增加。人口、经济与住房租赁市场相互影响,三系统的协调发展是城市可持续发展的必然要求。在构建人口-经济-住房租赁市场系统评价指标体系的基础上,采用耦合协调及空间误差模型,探讨2018—2019年中国35个大中城市人口-经济-住房租赁市场三系统的耦合协调水平及其影响因素。研究发现:1)人口、经济和住房租赁市场作为3个社会系统,彼此相互影响。在城市可持续发展视角下,三系统之间的协调发展应是人口合理流动、经济运行良好与住房租赁市场平稳运行,三系统共赢共荣。2)35个大中城市人口与经济综合水平整体有所上升,但住房租赁市场综合水平稍有下降。3)35个大中城市人口-经济-住房租赁市场系统的耦合协调度有所上升,但各城市间耦合协调水平差异变大,其中划入住房租赁试点城市的耦合协调度相对较高。同时,东部城市耦合协调度普遍较高,其中上海市和北京市已达到良好协调水平,其他城市基本为初级协调水平;中部和东北部城市大多为勉强协调水平;西部城市大多处于濒临失调水平。4)经济结构、人口规模、房地产市场发展水平与教育资源是提高人口-经济-住房租赁市场系统协调水平的重要因素。

关键词：住房租赁市场人口经济耦合协调中国

Soft and transient magnesium plasmonics for environmental and biomedical sensing

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第8期11卷 4390-4400页

作者： Ruomu Li Suxia Xie Labao Zhang Liqiang Li Deying Kong Qiangwang Run Xin Xing Sheng Lan Yin Cunjiang Yu xinran wang Li Gao School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing 210094 China School of Physics and Electronics Hunan University of Science and Technology Xiangtan 41120 I China School of Electronic Science and Engineering Nanjing University Nanjing 210046 China Advanced Materials Division Suzhou Institute of Nano-Tech and Nano-Bionics Suzhou 215123 China School of Materials Science and Engineering Tsinghua University 8eijing 100084 China Department of Electronic Engineering Tsinghua University Beijing 100084 China Department of Mechanical Engineering University of Houston Houston TX 77204 USA School of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI $3706 USA

Due to its controlled reaction with water and biofluids, Mg as a dissolvable conductor has enabled the development of many transient electronic devices. In addition, Mg is a novel plasmonic material with high extinction efficiency but its transient optical properties have not been explored thoroughly. In this study for the first time, we exploit the transient and tunable plasmonic properties of Mg in environmental and biomedical sensor applications. We used soft nanoimprint lithography to fabricate flexible and large-area Mg plasmonic structures that can be applied on the human skin. Their resonance （or color） can be tuned in the visible range by gradual Mg dissolution in a water fluid or vapor-rich environment; these structures can be easily implemented as passive optical sensors without the need for complex electronic circuits or a power supply. We demonstrate the applications of our optical sensors in the accurate monitoring of environmental humidity and physiological detection of sweat loss on the human skin during exercise. Our devices could be used as decomposable/resorbable optical sensors and can help minimize long-term health effects and environmental risks associated with consumer device waste, which will lead to many new possibilities in transient photonic device applications.

关键词： plasmonics transient flexible tunable sensors

Across two phylogeographic breaks: Quaternary evolutionary history of a mountain aspen (Populus rotundifolia) in the Hengduan Mountains

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diversity 2024年第3期46卷 321-332页

作者： Jieshi Tang Xiaoyan Fan Richard I.Milne Heng Yang Wenjing Tao xinran Zhang Mengyun Guo Jialiang Li Kangshan Mao Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education College of Life SciencesState Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengdu 610065PR China Institute of Molecular Plant Sciences University of EdinburghEdinburgh EH93JHUK School of Ecology and Environment Tibet UniversityLhasa 850000PR China

Biogeographical barriers to gene flow are central to plant *** East Asia,plant distribution is greatly influenced by two phylogeographic breaks,the Mekong-Salween Divide and Tanaka-Kaiyong Line,however,few studies have investigated how these barriers affect the genetic diversity of species that are distributed across *** we used 14 microsatellite loci and four chloroplast DNA fragments to examine genetic diversity and distribution patterns of 49 populations of Populus rotundifolia,a species that spans both the Mekong-Salween Divide and the Tanaka-Kaiyong Line in southwestern *** and migration hypotheses were tested using coalescent-based *** historical gene flow was observed between the western and eastern groups of ***,but substantial flow occurred across both the Mekong-Salween Divide and Tanaka-Kaiyong Line,manifesting in clear admixture and high genetic diversity in the central ***-borne pollen and seeds may have facilitated the dispersal of *** following prevalent northwest winds in the *** also found that the Hengduan Mountains,where multiple genetic barriers were detected,acted on the whole as a barrier between the western and eastern groups of *** niche modeling suggested that *** has undergone range expansion since the last glacial maximum,and demographic reconstruction indicated an earlier population expansion around 600 *** phylogeographic pattern of *** reflects the interplay of biological traits,wind patterns,barriers,niche differentiation,and Quaternary climate *** study emphasizes the need for multiple lines of evidence in understanding the Quaternary evolution of plants in topographically complex areas.

关键词： Chloroplast DNA Microsatellite Phylogeographic break Populus rotundifolia Quaternary history Wind direction

A Survey of Gesture Recognition Using Frequency Modulated Continuous Wave Radar

在线全文

学校读者我要写书评

暂无评论

Journal of Computer and Communications 2024年第6期12卷 115-134页

作者： xinran Qiu Junhao Liu Lulu Song Haofei Teng Jiaqi Zhang Zhengjie wang College of Electronic and Information Engineering Shandong University of Science and Technology Qingdao China

With technology advances and human requirements increasing, human-computer interaction plays an important role in our daily lives. Among these interactions, gesture-based recognition offers a natural and intuitive user experience that does not require physical contact and is becoming increasingly prevalent across various fields. Gesture recognition systems based on Frequency Modulated Continuous Wave (FMCW) millimeter-wave radar are receiving widespread attention due to their ability to operate without wearable sensors, their robustness to environmental factors, and the excellent penetrative ability of radar signals. This paper first reviews the current main gesture recognition applications. Subsequently, we introduce the system of gesture recognition based on FMCW radar and provide a general framework for gesture recognition, including gesture data acquisition, data preprocessing, and classification methods. We then discuss typical applications of gesture recognition systems and summarize the performance of these systems in terms of experimental environment, signal acquisition, signal processing, and classification methods. Specifically, we focus our study on four typical gesture recognition systems, including air-writing recognition, gesture command recognition, sign language recognition, and text input recognition. Finally, this paper addresses the challenges and unresolved problems in FMCW radar-based gesture recognition and provides insights into potential future research directions.

关键词： Millimeter-Wave Radar Gesture Recognition Human-Computer Interaction Feature Extraction

Halide vapor phase epitaxy of monolayer molybdenum diselenide single crystals

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Open 2023年第4期2卷 55-64页

作者： Taotao Li Yang Yang Liqi Zhou Wenjie Sun Weiyi Lin Lei Liu Xilu Zou Si Gao Yuefeng Nie Yi Shi xinran wang National Laboratory of Solid State Microstructures School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Electronic Science and Engineering Xiamen UniversityXiamen 361005China College of Material Science and Engineering Nanjing Tech UniversityNanjing 201110China School of Integrated Circuits Nanjing UniversitySuzhou 215163China Suzhou Laboratory Suzhou 215000China

Single-crystalline transition metal dichalcogenides(TMD)films are of potential application in future electronics and *** this work,a halide vapor phase epitaxy(HVPE)strategy was proposed and demonstrated for the epitaxy of molybdenum diselenide(MoSe_(2))single crystals,in which metal halide vapors were in-situ produced by the chlorination of molybdenum as sources for the TMD *** with the epitaxial sapphire substrate,unidirectional domain alignment was successfully achieved and monolayer single-crystal MoSe_(2) films have been demonstrated on a 2-inch wafer for the first time.A series of characterizations ranging from centimeter to nanometer scales have been implemented to demonstrate the high quality and uniformity of the MoSe_(2).This work provides a universal strategy for the growth of TMD single-crystal films.

关键词： halide vapor phase epitaxy single-crystal molybdenum diselenide 2D semiconductor wafer-scale

职业教育证书课程与产业发展适应性分析——以英国微证书项目为例

在线全文

学校读者我要写书评

暂无评论

职业技术教育 2022年第30期43卷 52-59页

作者：王欣然郄海霞天津大学教育学院天津300000

微证书是职业教育的一种新兴证书课程形式,指学生通过学习内容少且学时短的学习单元而获得的能力认证。通过探索英国微证书项目的产业适应现状和适应机制发现:产业作为需求方,以就业市场为中介、专业机构为依托发出技能信号,微证书供应... 详细信息

微证书是职业教育的一种新兴证书课程形式,指学生通过学习内容少且学时短的学习单元而获得的能力认证。通过探索英国微证书项目的产业适应现状和适应机制发现:产业作为需求方,以就业市场为中介、专业机构为依托发出技能信号,微证书供应商依据技能信号对微证书的领域、种类、内容等进行调整,在一定程度上适应英国产业结构、就业市场和产业技术的变动要求。借鉴英国经验,我国职业教育证书课程建设应注意加强职业教育信息化建设,提供多样化证书课程;建立统一框架,提高微证书堆叠性与实用性;加强质量保障,提高认证标准;重视雇主参与,适应产业发展需求。

关键词：英国微证书职业教育产业适应性