基于时空知识图谱的空间分析方法研究

受数据量和数据种类影响,传统空间分析中跨图层运算问题是造成效率低下的关键因素.知识图谱作为一种新型的数据结构,"图"的思想能够有效应用于空间地理信息数据的存储.利用时空知识图谱框架,结合全球离散格网系统和Google S2算法将地理空间数据存储于地理格网中,以图谱检索的方式替代传统空间分析过程,降低了时间复杂度,可以有效提高空间分析检索效率.以便民生活圈中地理实体变化作为典型空间分析案例,比较了传统多图层空间分析和时空知识图谱检索方式的分析效率.结果表明,基于时空知识图谱的检索方法比传统多图层空间分析存在着一个量级的提升,这对于解决地理信息系统空间分析效率问题具有参考意义.     

重力异常数据处理系统的开发与研究

利用SQL Server建立后台数据库和以面向对象的Delphi语言作为应用程序开发工具，在Windows 2000平台上开发了图形用户界面的重力异常数据处理系统。该系统集重力异常数据处理和数据库管理为一体，包括了数据输入、数据处理、数据查询、数据输出、数据库管理和系统安全管理六大功能模块。系统提供简洁的操作界面和友好的应用环境，便于用户使用。在实例运用中，将西藏地区的重力异常数据用该系统进行了处理。结果表明，系统操作简单方便．不仅能提高处理效率，还能实现对数据的系统管理。     

基于Android的移动端宗地图成图

宗地图是土地使用合同书附图及房地产登记卡附图,也是矿区土地管理的附图。利用移动端进行宗地图现场成图有利于土地所有者与矿区土地管理部门对宗地信息进行现场核查。本文在对Android系统研究的基础上搭建PC环境下Android开发的虚拟环境,采用开源的Java技术开发宗地图自动生成模块。该模块能够实现绘图区的定义、宗地图基础数据的录入、宗地图界址点坐标的展绘等功能。该模块以图斑为基本分析单元,能够快速、合理、美观地展绘界址点并标注宗地图要素,从而提高了土地管理部门的办公效率。     

设计与开发大规模倾斜影像数据管理工具

多角度倾斜相机已经成为三维数字城市建设的主要数据获取手段。针对倾斜摄影测量特点,面向海量影像集成处理需求,综合考虑相机成像模型以及影像关联关系,设计与实现了一种大规模倾斜影像数据管理工具,提供了工程管理信息存储、倾斜影像分组浏览、地面覆盖范围计算、目标快速检索等功能。应用实验证明该管理工具能够满足倾斜摄影测量工程管理的实际需求,有效提高了多模式海量影像数据的检索效率。     

国土资源大数据上云高效运行体系及关键技术研究——以山东省为例

基于山东省国土资源大数据上云系统建设和应用实践,在仿真实验的基础上,研究提高山东省国土资源大数据上云效率的运行体系和关键技术,为全省政务云建设提供参考。研究结果表明,通过高效运行体系构建和关键技术的应用,山东省国土资源上云系统快速显示、裁切、瓦片、数据挖掘等效率都得到不同程度的提高,其中上云系统并发性能耗时平均提速99.5%以上,矢量数据裁图效率同比提升17倍。研究结论:从功能设计、数据组织、硬件环境和拓扑结构四个方面统筹设计国土资源大数据上云系统高效运行体系,从数据处理、异构数据集成、分布式数据存储及挖掘、海量图库管理、灵活的搭建式开发等关键技术创新,可以大幅提高国土资源大数据上云运行效率。     

面向网格环境的Java跨平台GIS系统原型实现的关键技术

针对传统地理信息系统在空间数据处理中无法有效进行数据访问与集成的问题,提出了面向网格计算环境下空间数据访问与集成的地理信息系统体系架构,并给出了面向网格环境的Java跨平台GIS系统原型的设计方案,以及地理信息网格服务化提升的关键技术。进一步整合Java拓扑模型、Eclipse富客户端平台与面向海量数据访问的数据网格组件,以标准规范的开发流程,给出构建面向网格环境具备可拓展结构的跨平台地理信息系统原型的实现过程。     

基于LTE Cat-1的无线静力水准仪系统设计

为解决工程中建筑结构不均匀沉降的监测问题,以连通器作为基本理论,使用嵌入式实时操作系统（FreeRTOS）,设计一种基于LTE Cat-1的无线静力水准仪系统。系统分为数据采集终端、数据基站和客户端3个部分,其中数据采集终端主要由压强传感器、ZigBee终端及Cortex-M3微控制器等组成,利用ZigBee终端建立多个数据采集节点;数据基站由ZigBee协调器、Cortex-M3微控制器、Wi-Fi模块及LTE Cat-1等组成,ZigBee协调器收集多个终端的数据,用户可通过PC端或移动端连接设备Wi-Fi对数据进行现场查看,LTE Cat-1模块将数据上传至服务器;客户端主要是针对质检中心或从事市政工程行业的人员设计的,方便查看现场监测结果。现场测试结果表明,该系统能够完成沉降数据的采集与稳定上传,测量精度达到mm级。     

基于Android平台的地下管线数据移动采集软件设计与实现

城市地下管线是城市公共基础设施的重要组成部分,如何快速及时地维护和更新地下管线信息是城市管理的基础内容之一。利用纸笔绘制地下管线草图和属性信息的传统方式工作量大,数据质量低、效率差,已经不能适应目前的需求。本文基于Android和移动GIS设计并开发了地下管线信息采集系统,规范了地下管线外业数据采集流程。通过现场实际项目测试表明,该系统可以较好地提高地下管线数据采集的效率和质量,与地下管线数据的内业数据整理无缝衔接,满足城市管理中地下管线信息及时快速更新的需要。     

船载多传感器一体化测量数据实时存储方法研究

基于船载水陆一体化测量系统，设计一体化测量数据存储格式、多线程网络通信、时间同步控制以及时间匹配技术，实现船载多传感器一体化测量数据实时存储功能，并将采集的多源数据统一存储到文件中。实验证明，该存储方法能有效提高系统的集成度，克服多传感器存储效率冗余的缺陷，提高测量数据存储性能。     

基于Python的“地理处理”并行方案

在传统方式下,ArcGIS地理处理工具的执行过程不能充分利用高性能多核计算机的全部运算能力处理日益增加的地理数据,导致数据处理效率低下。本文在分析地理处理工具特点的基础上,充分利用Python语言的并行编程特点,构建具有通用性的地理处理任务并行运行解决方案。结合ArcGIS软件自身的特质,有效解决了并行运行所带来的数据竞争、数据共享与进程通讯等问题,达到了一定硬件环境条件下ArcGIS工具执行效率最大化的目的。通过典型地理处理任务中不同运行方式效率的对比测试与分析,证明了并行运行的有效性。     

Preliminary study on plasma membrane fluidity of Psychrophilic Yeast Rhodotorula sp.NJ298 in low temperature

The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail     

Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo-     

Hydraulics and Hydrology in Mountain Areas

<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m.     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied