检索结果-南通市图书馆

Geo-Spatial Information Science 2022年第2期25卷 169-181页

作者： Shuang Wang Guoqing Li wenyang yu yue Ma Aerospace Information Research Institute Chinese Academy of SciencesBeijingChina School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijingChina

Remote sensing data acquisition is one of the most essential processes in the field of Earth ***,traditional methods to acquire data do not satisfy the requirements of current applications because large-scale data processing is *** address this issue,this paper proposes a data acquisition framework that carries out remote sensing metadata planning and then realizes the online acquisition of large amounts of ***,this paper establishes a unified metadata cataloging model and realizes the catalog of metadata in a local ***,a coverage calculation model is presented,which can show users the data coverage information in a selected geographical region under the data requirements of a specific ***,according to the data retrieval results and the coverage calcula-tion,a machine-to-machine interface is provided to acquire target remote sensing *** were conducted to verify the availability and practicality of the proposed frame-work,and the results show the strengths and powerful capabilities of our framework by overcoming deficiencies in traditional *** also achieved the online automatic acquisi-tion of large-scale heterogeneous remote sensing data,which can provide guidance for remote sensing data acquisition strategies.

关键词： Online data acquisition remote sensing metadata planning metadata cataloging model coverage calculation machine-to-machine interface

Seasonal change of circulating leptin associated with testicular activities of the wild ground squirrels(Citellus dauricus)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Integrative Zoology 2023年第1期18卷 76-92页

作者： wenyang yu Sijie FAN Xi WANG Jueyu ZHU Zhengrong yuAN Yingying HAN Haolin ZHANG Qiang WENG Laboratory of Animal Physiology College of Biological Sciences and TechnologyBeijing Forestry UniversityBeijingChina

The purpose of this study was to explore the variations in the circulating leptin concentrations of the wild ground squirrels in relation to seasonal changes in testicular ***-eosin staining showed all types of elongated spermatids and spermatogenic cells existed in the testis in April,while the primary spermatocytes and spermatogonia were most advanced stages of germ cells in *** addition,the primary spermatocytes,secondary spermatocytes,and spermatogonia were most advanced stages of germ cells in *** highest circulating leptin concentration was consistent with the maximum body weight results from accumulation of adipose tissue in *** mRNA expression level of leptin receptor(Ob-R)and STAT3 was lowest in June,raised in September,and remained increased in ***-R and STAT3 were stronger staining in the Leydig cells in ***,the concentrations of testosterone(T)showed the maximum values in April,the minimum values in June,and signiﬁcant increases in ***,it is worth noting that the levels of T increased with the mRNA levels of Ob-R,STAT3,StAR,and testicular steroidogenic enzymes(3β-HSD,P450c17,and P450scc).Moreover,RNA-seq analyses of testis during the different periods showed that a total of 4209 genes were differ-entially expressed genes(DEGs);further analysis revealed that DEGs related with the Jak/STAT pathways and reproduction were *** together,the results suggested that the leptin regulated testicular function through the Jak/STAT pathways and testicular steroidogenic factor expressions.

关键词： leptin Ob-R STAT3 steroidogenic enzyme testis wild ground squirrel

Ice-wedge Pseudomorphs Showing Climatic Change Since the Late Pleistocene in the Source Area of the Yellow River, Northeast Tibet

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 Mountain Science 2005年第3期2卷 193-201页

作者： CHENG Jie ZHANG Xujiao TIAN Mingzhong yu wenyang yu Jiangkuan TANG Dexiang yuE Jianwei China University of Geosciences Beijing 100083 China Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

The source area of the Yellow River is located in the northeastern Tibetan Plateau, and is a high-elevation region with the annual mean temperature of -3.9℃. The ice-wedge pseudomorphs discovered in this region are recognized as two types. One was found in sandy gravel beds of the second terrace of the Yellow River. This ice-wedge pseudomorph is characterized by higher ratio of breadth/depth, and are 1-1.4 m wide and about 1 m deep. The bottom border of the ice-wedge pseudomorph is round arc in section. Another discovered in the pedestal of the second terrace has lower ratio of width/depth, and is o.3-1.0 m wide and 1-2 m deep. Its bottom border is sharp. Based on the TL dating, the former was formed at the middleHolocene （5.69±0.43 ka BP and 5.43±0.41 ka BP）, that is, the Megathermal, and the latter was formed at the late Last Glacial Maximum （13.49±1.43 ka BP）. Additionally, the thawing-freezing folders discovered in the late Late Pleistocene proluvium are 39.83±3.84 ka BP in age. The study on the ice-wedge pseudomorphs showed that the air temperature was lowered by up to 6-7℃ in the source area of the Yellow River when the ice-wedge pseudomorphs and thawing-freezing folds developed.

关键词： Ice-wedge pseudomorph paleoclimate Last Glacial Age Megathermal the source area of the Yellow River Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

宜昌万福垴编钟音乐性能研究

音乐研究 2024年第4期 42-46,I0011,I0012,47-54页

作者：魏冕余文扬湖北省博物馆

自2012年6月宜昌万福垴编钟出土以来,学术界根据其形制、纹饰、铭文等特征,对万福垴编钟的分组、分期和器主等相关问题进行了讨论。根据万福垴编钟的测音数据,以频谱作为主要分析对象,从其乐音体系、“一钟双音”效果、正鼓音音列、正... 详细信息

自2012年6月宜昌万福垴编钟出土以来,学术界根据其形制、纹饰、铭文等特征,对万福垴编钟的分组、分期和器主等相关问题进行了讨论。根据万福垴编钟的测音数据,以频谱作为主要分析对象,从其乐音体系、“一钟双音”效果、正鼓音音列、正侧鼓音全音列及隔离度等方面,可考察万福垴编钟的音列和音响情况。在初步评述其音乐性能的基础上,根据考古学分组,以西周典型四件组甬钟序列及其音程关系为重要参考,对编钟的音乐性能展开进一步研究,并推导出万福垴编钟属于“杂套”的结论。

关键词：万福垴编钟测音声频谱音乐性能编钟分组

在线全文

学校读者我要写书评

暂无评论

曾侯得编钟与周代编钟音列的发展

江汉考古 2024年第1期 78-81页

作者：曾攀余文扬湖北省博物馆湖北武汉430074

曾侯得编钟乐音体系为bE宫系统六声十八律,基本音级为徵-羽-宫-商-角-和,也可以被看成bE宫五声音列和bA宫五声音列集合,因此出现了bE宫“和”声,是曾国编钟序列的重要环节。参考其他春秋中期编钟的测音数据,推测编钟旋宫功能的发展使其... 详细信息

曾侯得编钟乐音体系为bE宫系统六声十八律,基本音级为徵-羽-宫-商-角-和,也可以被看成bE宫五声音列和bA宫五声音列集合,因此出现了bE宫“和”声,是曾国编钟序列的重要环节。参考其他春秋中期编钟的测音数据,推测编钟旋宫功能的发展使其音列出现不同宫五正声的集合,从而产生了超出五正声的声,这为探究曾侯乙编钟“十二声”系统的形成过程提供了线索。

关键词：曾侯得编钟 “和” 五正声旋宫

在线全文

学校读者我要写书评

暂无评论

基于空间语义角色的自然语言空间概念提取

武汉大学学报（信息科学版） 2005年第12期30卷 1100-1103页

作者：乐小虬杨崇俊于文洋中国科学院遥感应用研究所遥感科学国家重点实验室北京市9718信箱100101

根据空间信息的特点,从定义的空间语义角色入手,通过语义角色标注、短语识别以及概念模式匹配等手段,具体分析了自然语言中的空间实体、实体间空间关系以及空间过程的表达与提取方法。

关键词：空间语义角色 GIS 信息提取(IE) 自然语言处理(NLP)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

三维虚拟城市景观基础平台的设计与实现

计算机工程 2006年第2期32卷 215-217页

作者：于文洋杨崇俊中国科学院遥感应用研究所遥感科学国家重点实验室北京100101

虚拟城市是当今数字城市建设的一个重要组成部分。该文根据现有的硬件环境和网络环境提出了三维虚拟城市景观基础平台的系统结构,分析了基础平台中的三维空间数据管理、三维空间数据可视化和设计方法,最后在此基础上讨论了此基础平台的... 详细信息

虚拟城市是当今数字城市建设的一个重要组成部分。该文根据现有的硬件环境和网络环境提出了三维虚拟城市景观基础平台的系统结构,分析了基础平台中的三维空间数据管理、三维空间数据可视化和设计方法,最后在此基础上讨论了此基础平台的实现细节。

关键词：三维虚拟城市景观基础平台数据模型虚拟城市

在线全文

学校读者我要写书评

暂无评论

问答式移动空间信息服务中的本体实例搜索

高技术通讯 2006年第11期16卷 1107-1112页

作者：乐小虬杨崇俊刘冬林于文洋中国科学院文献情报中心北京100080 中国科学院遥感应用研究所遥感信息科学国家重点实验室北京100101

从地理本体入手，构造了空间语义角色和实例模式，通过空间语义角色标注、短语识别以及模式匹配等手段，从Web中提取出与空间位置相关的本体实例，为问答式移动空间信息服务提供了可动态更新且具有明确语义的数据源，并利用语义Web技术... 详细信息

从地理本体入手，构造了空间语义角色和实例模式，通过空间语义角色标注、短语识别以及模式匹配等手段，从Web中提取出与空间位置相关的本体实例，为问答式移动空间信息服务提供了可动态更新且具有明确语义的数据源，并利用语义Web技术，为移动用户提供问答式本体实例查询服务。初步实验表明，该方法具有较好的准确率，召回率有待进一步提高。

关键词：移动空间信息服务搜索引擎本体实例