检索结果-南通市图书馆

Groundwater net discharge rates estimated from lake level change in Badain Jaran Desert, Northwest China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2020年第5期63卷 713-725页

作者： Xingfan wang Hui ZHAO Yongwei SHENG Jianwei GENG keqi wang Hongyu YANG Key Laboratory of Desert and Desertification Northwest Institute of Eco-Enviroment and ResourcesChinese Academy of SciencesLanzhou 730000China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Geography University of CaliforniaLos AngelesCA 90095USA

Over a hundred sizable lakes,some even larger than^1 km2,are distributed across the lowlands between megadunes in the southeastern Badain Jaran Desert(BJD),northwest *** rather limited precipitation and hardly any surface runoff,these lakes are fed mainly by ***,the source of the groundwater and the groundwater discharge rates to these lakes are poorly *** level and temperature of four representative lakes in the southeastern BJD were monitored continuously between 2013 and *** surface evaporation and rainfall in this area were also *** these acquired data,groundwater discharge rates were estimated using water balance *** results show that the four lakes have similar recharge and discharge patterns,but at different average net groundwater discharge rates ranging from 1.79 to 3.09 mm d?*** lake level variation mainly depends on groundwater discharge and lake surface *** found that diurnal lake level variation may be controlled by earth tide and atmospheric pressure change,and is five times greater than the *** desert precipitation and deep confined groundwater with high temperature were found also recharging the desert *** Empirical Mode Decomposition(EMD)method was used to identify the lake level *** lake levels increased over the last four years,except one decreased in 2015 and *** lake levels’increasing trend is synchronously similar with the precipitation in north *** study analyzes annual and seasonal lake level variations,and also finds the diurnal water cycle between the groundwater and lake water for the first time.

关键词： Groundwater discharge Lake level Water balance Badain Jaran Desert

Norlichexanthone purified from plant endophyte prevents postmenopausal osteoporosis by targeting ERa to inhibit RANKL signaling

在线全文

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2021年第2期11卷 442-455页

作者： keqi wang Yongyan Chen Shuo Gao Maosi wang Mengmeng Ge Qian Yang Mingkai Liao Lin Xu Junjie Chen Zhiping Zeng Haifeng Chen Xiao-kun Zhang Ting Lin Hu Zhou School of Pharmaceutical Sciences Fujian Provincial Key Laboratory of Innovative Drug Target ResearchXiamen UniversityXiamen 361102China High Throughput Drug Screening Platform Xiamen UniversityXiamen 361102China

Although different types of drugs are available for postmenopausal osteoporosis,the limitations of the current therapies including drug resistances and adverse effects require identification of novel anti-osteoporosis ***,we defined that norlichexanthone(NOR),a natural product,is a ligand of estrogen receptor-alpha(ERα)and revealed its therapeutic potential for postmenopausal *** used mammalian-one hybrid assay to screen for ERαmodulators from crude extracts of several plant *** a result,NOR purified from the extract of endophyte ARL-13 was identified as a selective ERα*** directly bound to ERαwith an affinity in nanomolar range,revealing that it is a natural ligand of ERα.NOR induced osteoblast formation in MC3T3-E1 precursor ***,NOR inhibited receptor activator of nuclear factor-kappa B ligand(RANKL)-induced osteoclast formation in both RAW264.7 macrophages and mouse primary ***,NOR inhibited RANKL-induced association of ERαand TRAF6 to prevent ERα-mediated TRAF6 activation via Lys63-linked ***,NOR exhibited potent anti-osteoporosis efficacy in an ovariectomized mouse *** to estrogen,NOR was of much less capability in stimulating endometrial hyperplasia and promoting mammalian cancer cell *** together,our study identified NOR as a natural and high affinity ligand of ERαwith substantial anti-osteoporosis but less estrogenic activity.

关键词： Norlichexanthone Osteoporosis Osteoclast RANKL signaling TRAF6 ERa

Robust Visual SLAM Algorithm for Dynamic Indoor Environments

在线全文

学校读者我要写书评

暂无评论

Robust Visual SLAM Algorithm for Dynamic Indoor Environments

Design and simulation of a novel 4H-SiC LGAD timing device

第40届中国控制会议

作者： Lijin Fang keqi wang Yingcai Wan School of Robot Science and Engineering Northeastern University

In real scenes,traditional visual SLAM algorithm is limited by the assumption of static *** to the influence of moving objects,the traditional visual odometry makes a large number of mismatches and makes the system unable to run statically in real *** this paper,a robust visual SLAM algorithm for indoor dynamic environment is proposed based on deep ***,the object detection network is used to detect the dynamic objects and determine the moving objects in the surrounding ***,a semantic data association method and key-frame selection strategy are proposed for the tracking thread and the local graph thread to reduce the influence of moving objects on the algorithm ***,the TUM open datasets is *** results show that the proposed method reduces the mean root mean square error（RMSE） of ORB-SLAM2 by more than 94% in dynamic scenarios compared to the previous improved *** addition,compared to other deep learning based SLAM systems,the proposed method has a better balance of speed and accuracy in dynamic environments.

关键词： simultaneous localization and mapping dynamic environment object detection motion removal

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2024年第2期8卷 1140-1147页

作者： keqi wang Tao Yang Chenxi Fu Li Gong Songting Jiang Xiaoshen Kang Zaiyi Li Hangrui Shi Xin Shi Weimin Song Congcong wang Suyu Xiao Zijun Xu Xiyuan Zhang Institution of High Energy Physics Chinese Academy of SciencesBeijing100049China Department of Physics Liaoning UniversityShenyang110036LiaoningChina University of Chinese Academy of Sciences Beijing100049China Department of Physics Jilin UniversityChangchun130015JilinChina Department of Mechanical Engineering Heilongjiang University of Science and TechnologyHarbin150022HeilongjiangChina College of Physics and Electronic Engineering Shanxi UniversityTaiyuan030006ShanxiChina Shandong Institute of Advanced Technology Jinan250100China Shandong University Jinan250100China

Purpose Silicon-based fast timing detectors have been widely used in high-energy physics,nuclear physics,space exploration and other fields in recent ***,silicon detectors often require complex low-temperature systems when operating in irradiation environment,and their detection performance decreases with the increase in the irradiation *** with silicon,silicon carbide(SiC)has a wider band gap,higher atomic displacement energy,saturated electron drift velocity and thermal ***,the low-gain avalanche detector avoids cross talk and high noise from high multiplication due to its moderate gain,and thus can maintain a high detector signal without increasing *** Thus,the 4H-SiC particle detector,especially the low-gain avalanche detector,has the potential to detect the minimal ionizing particles under extreme irradiation and high-temperature *** In this work,the emphasis was placed on the design of a 4H-SiC low-gain avalanche detector(LGAD),especially the epitaxial structure and technical process which play main *** addition,a simulation tool—RASER(RAdiation SEmiconductoR)—was developed to simulate the performances including the electrical properties and time resolution of the 4H-SiC LGAD we *** The working voltage and gain effectiveness of the LGAD were verified by the simulation of electrical *** time resolution of the LGAD is(35.0±0.2)ps under the electrical field of−800 V,which is better than that of the 4H-SiC PIN detector.

关键词： Silicon carbide LGAD.Radiation-resistant Time resolution

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

纸浆模塑餐具热压干燥过程的研究

农业工程学报 2005年第12期21卷 34-38页

作者：邱仁辉黄祖泰王克奇福建农林大学植物纤维新材料研究所福州350002 东北林业大学机电工程学院哈尔滨150040

该文对纸浆模塑餐具热压干燥工艺过程进行了分析,在此基础上建立了模具热传导方程,采用分离变量法推导出模具热传导方程的解析解,同时应用M atlab软件进行数值求解。根据热传导方程的解析解、数值解计算的模具表面温度值与与实测值较为... 详细信息

该文对纸浆模塑餐具热压干燥工艺过程进行了分析,在此基础上建立了模具热传导方程,采用分离变量法推导出模具热传导方程的解析解,同时应用M atlab软件进行数值求解。根据热传导方程的解析解、数值解计算的模具表面温度值与与实测值较为吻合。对模具的传热分析为模具结构设计及加热管布置提供了理论依据。根据热传导方程并结合生产实际经验,推导出相应的湿坯热压时间,为热压过程的控制提供了基础。

关键词：纸浆模塑制品热压模具温度分布热压时间

在线全文

学校读者我要写书评

暂无评论

齐鲁政治文化概说

东岳论丛 2010年第6期31卷 63-69页

作者：王克奇山东师范大学历史文化与社会发展学院山东济南250014

齐鲁政治文化体系以《五经》为元典文本,以儒家"仁"、"礼"的政治主张为核心内容,执政理念上强调以民为本,方法手段上讲求王道霸道兼用、有为无为互补,大政方针上强调统一和秩序,理想目标追求"君"与"民"和谐共存的社会。齐鲁政治文化,在... 详细信息

齐鲁政治文化体系以《五经》为元典文本,以儒家"仁"、"礼"的政治主张为核心内容,执政理念上强调以民为本,方法手段上讲求王道霸道兼用、有为无为互补,大政方针上强调统一和秩序,理想目标追求"君"与"民"和谐共存的社会。齐鲁政治文化,在长期的历史发展中,经历了从意识到理念,又从理念到意识的反复转换,化成为一种普遍存在的社会意识,对该地区的民众心理产生了深刻的影响,从而潜移默化地控制了群体的社会行为,制约了该地区的政治进程。其基本特征:政治上的正统性、文化上的包容性,以及价值观念上特殊性与普适性的结合互补。

关键词：齐鲁政治文化《五经》民本思想

在线全文

学校读者我要写书评

暂无评论

单缸柴油机滑动轴承润滑的计算机仿真

小型内燃机与摩托车 2008年第1期37卷 38-43页

作者：王克琦潍坊学院机电工程学院山东潍坊261061

针对单缸柴油机使用的滑动轴承的润滑设计问题,采用计算机对它的润滑性能进行了仿真。通过编程计算了滑动轴承的油膜厚度、油膜压力、摩擦功耗、润滑油流量、温度等参数。结果表明,通过仿真得到润滑性能数据,可实现提前对单缸柴油机滑... 详细信息

针对单缸柴油机使用的滑动轴承的润滑设计问题,采用计算机对它的润滑性能进行了仿真。通过编程计算了滑动轴承的油膜厚度、油膜压力、摩擦功耗、润滑油流量、温度等参数。结果表明,通过仿真得到润滑性能数据,可实现提前对单缸柴油机滑动轴承的润滑特性进行预测,能够提高润滑设计的可靠性,具有较高的实用价值。

关键词：单缸柴油机滑动轴承润滑计算机仿真

基于感知自然物象的建筑创作方法——拟态建筑

在线全文

学校读者我要写书评

暂无评论

四川建筑科学研究 2011年第6期37卷 236-240页

作者：王科奇吉林建筑工程学院建筑与规划学院吉林长春130021

人类文明的进程离不开向大自然学习,大自然中很多物象的特性和形象给我们以思想和方法的启迪,同样也会对建筑的创作产生影响,拟态建筑是建筑师在建筑设计领域向自然学习的一种思想、策略、方法,它是科学、技术、艺术以及自然的有机结合... 详细信息

人类文明的进程离不开向大自然学习,大自然中很多物象的特性和形象给我们以思想和方法的启迪,同样也会对建筑的创作产生影响,拟态建筑是建筑师在建筑设计领域向自然学习的一种思想、策略、方法,它是科学、技术、艺术以及自然的有机结合。本文介绍了拟态建筑的概念、类型、特征及其艺术表现力。

关键词：自然建筑生物拟态拟态建筑

减弱“被害恐惧感”视角下长春市半封闭住区防卫安全设计研究

在线全文

学校读者我要写书评

暂无评论

西安建筑科技大学学报（自然科学版） 2020年第4期52卷 555-562页

作者：王科奇王嘉仪吉林建筑大学建筑与规划学院吉林长春130118

病态的住区外环境是引发居民被害恐惧感的重要因素.以CPTED理论和城市“易犯罪”空间理论为支撑,提出空间位置、空间形态和空间氛围是影响居民被害恐惧感的三大空间属性,在对长春市代表性半封闭住区外环境调研的基础上,梳理其外环境中... 详细信息

病态的住区外环境是引发居民被害恐惧感的重要因素.以CPTED理论和城市“易犯罪”空间理论为支撑,提出空间位置、空间形态和空间氛围是影响居民被害恐惧感的三大空间属性,在对长春市代表性半封闭住区外环境调研的基础上,梳理其外环境中对居民被害恐惧感产生不良影响的防卫安全问题,分析了住区外环境的可见性、通达性、领域性、识别性、积极性、意象性等环境特性对被害恐惧感的影响,借助SPSS软件对调研数据进行logistic回归分析,量化空间环境因素对被害恐惧感的影响程度,在此基础上,提出解决问题的思路框架以及可减弱居民被害恐惧感的防卫安全设计策略,分别为针对空间环境的可见性问题、通达性问题、识别性问题和意象性问题的策略.

关键词：被害恐惧感防卫安全设计半封闭住区外环境