检索结果-南通市图书馆

Estimation of the Distribution of Global Anthropogenic Heat Flux

Atmospheric and Oceanic Science Letters 2012年第2期5卷 108-112页

作者： Chen Bing shi guang-yu The State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The radiance lights data in 2006 from the National Oceanic and Atmospheric Administration Air Force Defense Meteorological Satellite Program/Operational Linescan System (DMSP/OLS) and authoritative energy data distributed by the United State Energy Information Administration were applied to estimate the global distribution of anthropogenic heat flux.A strong linear relationship was found to exist between the anthropogenic heat flux and the DMSP/OLS radiance *** a global scale,the average value of anthropogenic heat flux is approximately 0.03 W m 2 and 0.10 W m 2 for global land *** results indicate that global anthropogenic heat flux was geographically concentrated and distributed,fundamentally correlating to the economical *** anthropogenic heat flux concentrated in the economically developed areas including East Asia,Europe,and eastern North *** anthropogenic heat flux in the concentrated regions,including the northeastern United States,Central Europe,United Kingdom,Japan,India,and East and South China is much larger than global average level,reaching a large enough value that could affect regional *** the center of the concentrated area,the anthropogenic heat flux density may exceed 100 W m 2,according to the results of the *** developing areas,including South America,Central and North China,India,East Europe,and Middle East,the anthropogenic heat flux can reach a level of more than 10 W m 2 ;however,the anthropogenic heat flux in a vast area,including Africa,Central and North Asia,and South America,is *** the development of global economy and urban agglomerations,the effect on climate of anthropogenic heat is essential for the research of climate change.

关键词： anthropogenic heat flux global distribution estimation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Detecting Aerosols over Land from Satellites by Measuring Far IR Radiation from the Earth-Atmospheric System

引用

Atmospheric and Oceanic Science Letters 2010年第2期3卷 111-115页

作者： shi guang-yu SUN yuan-Long LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

In this study, a special method is proposed for detecting aerosols over land by analyzing satellitemeasured far IR radiation at three channels, 8.7, 11.5, and 12.5 lain. Sensitivity tests revealed that the behavioral features of radiative brightness temperatures （BTs） at these three channels with increasing optical depth are different among different types of aerosols. Analyzing how BTs and their differences, xBT （BT11.5-BT12.5） and YBT （BT8.7-BT11.5）, behave with varying optical depth can help to qualitatively distinguish among aerosols and semi-quantitatively estimate their optical thicknesses. In addition, the authors found that the vertical density profile of aerosols has little impact on this method.

关键词： aerosol remote-sensing over-land IR radia- tion brightness temperature satellite

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Self-organization of Reconfigurable Protocol Stack for Networked Control Systems

引用

International Journal of Automation and computing 2011年第2期8卷 221-235页

作者： Chun-Jie Zhou Hui Chen yuan-Qing Qin yu-Feng shi guang-Can yu Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University Science and Technology Wuhan 430074 PRC

In networked control systems （NCS）,the control performance depends on not only the control algorithm but also the communication protocol *** performance degradation introduced by the heterogeneous and dynamic communication environment has intensified the need for the reconfigurable protocol *** this paper,a novel architecture for the reconfigurable protocol stack is proposed,which is a unified specification of the protocol components and service interfaces supporting both static and dynamic reconfiguration for existing industrial communication *** the architecture,a triple-level self-organization structure is designed to manage the dynamic reconfiguration procedure based on information exchanges inside and outside the protocol ***,the protocol stack can be self-adaptive to various environment and system requirements through the reconfiguration of working mode,routing and scheduling ***,the study on the protocol of dynamic address management is conducted for the system of controller area network （CAN）.The results show the efficiency of our self-organizing architecture for the implementation of a reconfigurable protocol stack.

关键词： Networked control system (NCS) communication network self-organization protocol stack reconfiguration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparisons of cloud detection among four satellite sensors on severe haze days in eastern China

引用

Atmospheric and Oceanic Science Letters 2018年第1期11卷 86-93页

作者： TAN Sai-Chun ZHANG Xiao WANG Hong CHEN Bin shi guang-yu shi Chong State Key Laboratory of Numerical Modeling of Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Nanjing China College of Earth Science University of Chinese Academy of Sciences Beijing China State Key Laboratory of Severe Weather/Institute of Atmospheric Composition Chinese Academy of Meteorological Sciences China Meteorological Administration Beijing China Key Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China

Satellite remote sensing is very important to obtain a variety of cloud properties. However, the data quality from satellites varies with different satellite characteristics. From December 2015 to January 2016, ground-based air quality index （AQI） data showed severe haze events occurred successively in eastern China, particularly in the Beijing-Tianjin-Hebei region. During those days, a red alert （the most serious level）, orange alert （the second-highest level）, and yellow alert （the third-highest level） for haze, were issued in Beijing. Cloud detection from four sensors onboard the ＇A-Train＇satellite constellation were compared for two severe haze episodes, on 21 and 30 December 2015 respectively. Results showed that the MODIS sensor onboard the Aqua satellite misclassified aerosol as cloud, while the other three sensors-AIRS onboard Aqua, the cloud profiling radar onboard CloudSat, and CALIOP onboard CALIPSO-did not observe cloud over the same location. Through the high-AQI haze region in the CALIPSO and CloudSat orbit track, MODIS marked cloud close to the surface, while the MODIS true-color image and CALIOP observed an aerosol layer over the same location, suggesting MODIS falsely observed cloud there. Over the haze region in eastern China, MODIS observed 36% on average greater cloud fraction than AIRS, suggesting haze pollution induces a greater MODIS cloud amount.

关键词： Cloud detection aerosol haze MODIS AIRS CloudSat CALIPSO

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Aerosol optical properties derived from simultaneous sunphotometer and aureolemeter measurements in Lhasa

引用

Journal of Environmental Sciences 2000年第4期12卷 439-443页

作者： BAI yu-bo shi guang-yu Koichi Tamura Takashi shibata Yasunobu Iwasaka Kaneta shin′ichi Takamura Tamio State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Inst itute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Solar Terrestrial Environment Laboratory Nagoya UniversityNagoyaJapan Center for Environmental Remote Sensing Chiba UniversityChibaJapan

In order to obtain some aerosol properties in Tibetan Plateau atmosphere, simultaneous measurements of aerosols by use of a sunphotometer and an aureolementer were performed in the summer of 1998 in Lhasa(29.65°N, 91.13°E). Optical depth, volume size distribution and phase\|function of aerosols were obtained from the measurements. Religious activities can have an effect on optical depth in Lhasa. The daily average aerosol optical depth( λ =500 nm) is less than 0.2. The diurnal variations of aerosol optical depth are relatively small during the period of summer. The maximal value of the mode radius in the volume size distribution are about 0.4, 2.0 and 4.0μm.

关键词： sunphotometer aureolemeter optical depth aerosol volume spectrum phase function

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Assessment of Dust Aerosol Optical Depth and Shortwave Radiative Forcing over the Northwest Pacific Ocean in Spring Based on Satellite Observations

引用

Atmospheric and Oceanic Science Letters 2009年第4期2卷 224-229页

作者： CHEN Lin shi guang-yu ZHONG Ling-Zhi TAN Sai-Chun State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical FluidDynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beo＇ing 100029 China Key laboratory of Radiometric Calibration and Validation for Environmental Satellites （KLRCV） National Satellite Meteorology Center China Meteorological Administration （SMC/CMA） Beijing 100081 China State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China

Dust aerosol optical depth (AOD) and its ac-companying shortwave radiative forcing (RF) are usually simulated by numerical ***,by using 9 months of Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol product data in combination with Clouds and the Earth's Radiant Energy System Single Scanner Footprint (CERES/SSF) data,dust AOD and its shortwave RF were estimated over the cloud-free north-west (NW) Pacific Ocean in the springs of 2004,2005,and *** results showed that in this region,the mean dust AOD and its shortwave RF were 0.10 and 5.51 W m 2,*** order to validate the dust AOD de-rived by MODIS,results from the Goddard Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) model were also used *** correlation coefficient between the monthly averaged dust AOD derived by MODIS measurements and the model simulation results was approximately *** the estimates of the dust AOD and its shortwave RF obtained in this study are based mainly on satellite data,they offer a good reference for numerical models.

关键词： dust aerosols optical depth shortwave radia- tive forcing northwest Pacific satellite measurements

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Matrix metalloproteinase-9 was involved in the immuno-modulatory defect of mesenchymal stem cell from chronic myeloid leukemia patients

引用

Chinese Medical Journal 2011年第16期124卷 2423-2430页

作者： ZHU Xi-shan shi Wei AN guang-yu ZHANG Hong-mei SONG yu-guang LI You-bin Institute of Internal Oncology Center of Tumor Research andTherapy Beijing Shijitan Hospital Capital Medical University (theNinth Medical College of Peking University) Beijing 100038China

Background Overwhelming evidences on chronic myeloid leukemia （CML） indicate that patients harbor quiescent CML stem cells that are responsible for blast crisis. While the hematopoietic stem cell （HSC） origin of CML was first suggested over 30 years ago, recently CML-initiating cells beyond HSCs are also being investigated. Methods We have previously isolated fetal liver kinase-l-positive （Flkl＋） cells carrying the BCR/ABL fusion gene from the bone marrow of Ph＋ patients with hemangioblast property. In this study, we isolated CML patient-derived FIk1＋CD31-CD34- mesenchymal stem cells （MSCs） and detected their biological characteristics and immunological regulation using fluorescence in situ hybridization （FISH） analysis, fluorescence activated cell sorting （FACS）, enzyme-linked immunoadsorbent assay, mixed lymphocyte reaction assays; then we compared these characters with those of the healthy donors. Results CML patient-derived FIk1＋CD31-CD34- MSCs had normal morphology, phenotype and karyotype while appeared impaired in immuno-modulatory function. The capacity of patient FIk1＋CD31-CD34- MSCs to inhibit T lymphocyte activation and proliferation was impaired in vitro. Conclusions CML patient-derived MSCs have impaired immuno-modulatory functions, suggesting that the dysregulation of hematopoiesis and immune response may originate from MSCs rather than hematopoietic stem cells （HSCs）. MSCs might be a potential target for developing efficacious treatment for CML.

关键词： chronic myeloid leukemia mesenchymal stem cell immune regulation matrix metalloproteinase-9

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

层合板界面层的弹簧界面元等效刚度计算模型

引用

计算力学学报 2011年第B04期28卷 131-135,146页

作者：赵鹏石广玉天津大学力学系天津300072

弹簧界面元是一种最常用的层合结构界面脱层数值模拟的计算模型。但目前对应于给定的复合材料层合板界面层,弹簧界面元的长度和等效刚度的确定却没有严格的方法,所以时常因为弹簧元刚度定义的不当而导致脱层数值模拟结果的不稳定甚至计... 详细信息

弹簧界面元是一种最常用的层合结构界面脱层数值模拟的计算模型。但目前对应于给定的复合材料层合板界面层,弹簧界面元的长度和等效刚度的确定却没有严格的方法,所以时常因为弹簧元刚度定义的不当而导致脱层数值模拟结果的不稳定甚至计算困难。本文给出了一种基于层合板粘接层的实际厚度和材料特性确定弹簧界面元的长度和等效刚度的计算模型。通过把所给弹簧界面元等效刚度计算模型用于ANSYS中的非线性弹簧单元COMBIN39和COMBIN14,本文对复合材料双悬臂梁(DCB)和端边切口弯曲(ENF)梁的脱层扩展试验进行了有限元数值模拟;所得数值脱层预测结果与试验数据吻合良好。算例也表明,文中所给弹簧界面元长度和等效刚度的计算模型不仅计算简单和准确,并且所给脱层扩展的数值模拟也稳定。

关键词：复合材料层合板界面损伤脱层数值模拟弹簧界面元弹簧元刚度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

压电功能梯度层合梁的力-电-热耦合梁单元及最优振动控制

引用

工程力学 2023年第3期40卷 14-26页

作者：柏冬军石广玉天津大学力学系天津300354

给出了一个压电功能梯度层合梁振动分析的两节点力-电-热耦合梁单元,并将其用于功能梯度层合梁的振动最优控制。在这个多场耦合梁单元中,功能梯度材料的等效力学性能用Voigt或Mori-Tanaka模型表征;梁的位移场用shi改进的三阶剪切变形板... 详细信息

给出了一个压电功能梯度层合梁振动分析的两节点力-电-热耦合梁单元,并将其用于功能梯度层合梁的振动最优控制。在这个多场耦合梁单元中,功能梯度材料的等效力学性能用Voigt或Mori-Tanaka模型表征;梁的位移场用shi改进的三阶剪切变形板理论描述;压电层的电势场用Layer-wise理论分层表征,且呈高阶非线性电势场的压电层可离散成数个子层。用Hamilton原理推导了压电功能梯度梁的力-电-热耦合单元列式,用拟协调元法给出了多场耦合梁单元的高计算效率的显式单元刚度矩阵,以及采用线性二次型(LQR)最优控制算法进行压电功能梯度层合梁的最优振动控制。使用所得力-电-热耦合梁单元进行了压电功能梯度层合梁的静力和动力分析。数值算例表明,所得力-电-热耦合梁单元可靠、准确和高效,LQR最优控制算法得到最优控制电压可有效抑制功能梯度梁的振动且实现控制系统能量的优化。

关键词：压电功能梯度层合梁力-电-热耦合梁单元杂交板理论三阶剪切变形梁理论拟协调元法最优振动控制

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

正交异性钢桥面板肋-面板焊缝疲劳验算的应力分析模型评估

引用

工程力学 2019年第B06期36卷 98-105页

作者：杨雅斌石广玉天津大学力学系

以天津塘沽海河大桥的正交异性钢桥面板为例,建立钢箱梁节段的有限元分析(FEA)模型、简化FEA模型和基于钢箱梁节段的子模型进行肋-面板焊缝疲劳应力分析模型的评估。计算结果表明:对于远离纵腹板处的肋-面板焊缝,通过提高简化FEA模型中... 详细信息

以天津塘沽海河大桥的正交异性钢桥面板为例,建立钢箱梁节段的有限元分析(FEA)模型、简化FEA模型和基于钢箱梁节段的子模型进行肋-面板焊缝疲劳应力分析模型的评估。计算结果表明:对于远离纵腹板处的肋-面板焊缝,通过提高简化FEA模型中横隔板高度和约束横隔板底部翼缘的方式可减小与钢箱梁节段FEA模型结果的误差;对于靠近纵腹板处的肋-面板焊缝,所有简化FEA模型的应力计算结果均低于钢箱梁节段FEA模型的结果,且误差超过23%。基于钢箱梁节段的三跨子模型可以准确地给出钢桥面板任意位置的肋-面板焊缝的疲劳应力。它具有钢箱梁节段FEA模型的计算精度和简化FEA模型的计算效率,因此它可作为正交异性钢桥面板任意位置处肋-面板焊缝疲劳应力分析的准确和高效计算模型。

关键词：正交异性钢桥面板肋-面板焊缝疲劳应力分析模型钢箱梁阶段有限元模型简化有限元模型子模型法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：