GIS组件分类与检索技术的研究和应用

讨论了组件分类和匹配原理，并对签名匹配法进行了研究，把它作为从已知的组件中获取可重用组件的方法，最后提出了在国土信息管理领域中GIS组件的解决方案。     

大气阻力对静稳态飞行目标落点预报影响评估

大气阻力对高空静稳态飞行目标运行轨迹的影响是航天测控领域的研究热点与难点问题。在分析空间飞行器受力状况基础上,根据飞行器运动学状态方程,通过数值模拟方式定量评估了大气阻力对飞行器运行轨迹影响。结论表明:在再入段中,大气阻力是影响飞行器运行轨迹的最主要影响因素,对飞行器落点位置会造成数百米乃至数千米位置偏差,同时使落地时间有较大变化。     

支持近似最短距离查询的高效图加密机制

近似最短距离查询是图检索的基本模式.为了保护外包数据安全,通常对图数据进行加密.已有加密方案使用两跳覆盖模型构建加密图索引,导致索引结构复杂,降低了查询效率.本文提出了一种基于图压缩的加密机制,可以提高图的检索效率,并且支持加密图最短路径查询.该机制使用K-mediods聚类使得图中的节点按照距离分成K个簇,每个簇内的节点使用其中心节点代理,当查询2个点间最短距离时,对于相同簇内的点直接查询,对于簇间的点使用代理节点查询距离.实验结果表明该机制有效地减少了查询时间,提高了查询效率,且查询结果误差度在可接受范围内.     

基于 JavaScript 的地理事件可视分析框架设计

随着互联网的飞速发展,网络环境下地理信息的可视化表达成为研究的热点。在JavaScript技术和可视分析技术研究基础上,对互联网中地理事件可视分析框架进行设计,目的是探索网络环境下,地理事件可视化的表达方式和可行性分析,搭建适合互联网的地理事件可视分析框架,为基于Web的地理信息可视分析系统的实现打下基础。     

Identification of SNARE proteins in fish-Tilapia Oreochromis niloticus

1 IntroductionSecretion is a basic function of all living organ-isms. In fish, like in mammals, neurotransmitters,hormones, enzymes and other macromolecules aresecreted in several neuronal, neuroendocrine and ex-ocrine organs and tissues located in brain,…     

中国基岩海湾潮流地貌模式及其沉积动力特征

对我国基岩海湾内的潮流沉积和地貌进行了系统研究。根据潮滩、潮流水道、潮流沙脊等地貌单元的组合特征，概括出3种潮流地貌模式：潮滩型、滩-槽型和滩槽-脊型。通过各模式海湾环境特征的对比分析，设定紊动射流系数Rbjet做为判别潮流水道形成发育程度的水动力参数，发现潮流水道较为发育的滩-槽型和滩-槽-脊型海湾往往开敞度较小，纵深较长，而平均潮差较大，Rbjet大于45。潮流沙脊是区分滩-槽型和滩-槽脊型潮流地貌模式的标志地貌，粗颗粒泥沙来源是其发育的必备条件：残留沉积、海岸侵蚀来沙丰富的海湾内潮流沙脊发育；河流来沙则可以改造形成小规模现代潮流脊；而靠近大河河口，细颗粒来源丰富的海湾则不利于潮流沙脊发育，湾内形成滩-槽型潮流沉积。     

中全新世以来南极宇航员海的古生产力演变

本文通过对南极宇航员海ANT36-C4-05岩心的放射性核素²¹⁰Pb、AMS¹⁴C测年、XRF岩心扫描、多参数物性扫描和主、微量元素的测试分析,重建了该海区中全新世(6 500 Cal a BP)以来的古生产力演变及其制约因素。研究结果表明,中全新世以来宇航员海古生产力波动较强,其演变趋势与南极气温变化基本一致,受海冰范围变化制约较大。在6 500~5 200 Cal a BP期间宇航员海古生产力随着温度升高和海冰范围减小而快速上升;在5 200~3 350 Cal a BP期间宇航员海的古生产力处于高值期,波动较小;在3 350~2 000 Cal a BP期间随着温度降低和海冰范围的扩大,硅质、钙质生产力下降;在2 000~0 Cal a BP期间古生产力水平变化复杂,变化程度相较于之前小。同时,中全新世以来宇航员海区沉积记录较好地反映了5 500 Cal a BP冷事件、DACP冷事件、MWP暖期和LIA冷事件的气候变化,受冷、暖事件影响导致的古生产力的变化最为明显。     

松辽盆地西缘白城地区土壤油气地球化学特征及综合评价

松辽盆地西缘土壤油气化探工作采用酸解烃法、紫外光谱法、荧光光谱法等分析测试方法,总结白城地区近地表甲烷、重烃、芳烃及其衍生物和蚀变碳酸盐的地球化学异常特征,圈定出七棵树Ⅰ级综合异常和前进马场Ⅲ级综合异常.七棵树Ⅰ级综合异常具有异常强度高、规模大的特征,异常区是白城地区最有利含油气远景区,且已有钻孔镇深1井取得较好的油气显示,是进一步勘探的主要方向.前进马场Ⅲ级综合异常规模小,指标组合简单,但强度较高,值得进一步关注.     

Formation conditions and reservoir-forming models of the Ordovician buried hill reservoirs in the Jizhong depression

The buried hill in the Jizhong depression contains abundant petroleum reserves and are important production areas. The Ordovician buried hill has restricted the discovery of new oil and gas exploration targets because of its strong reservoir heterogeneity and complex reservoir-controlling factors. Based on a large volume of core, thin section, logging, seismic, and geochemical data and numerous geological analyses, the reservoir-forming conditions and modes were systematically analyzed to guide the exploration and achieve important breakthroughs in the Yangshuiwu and Wen’an slope buried hills. The study revealed that three sets of source rocks of the third and fourth members of the Shahejie Formation from the Paleogene and Carboniferous-Permian were developed in the Jizhong depression, providing sufficient material basis for the formation of buried hill oil and gas reservoirs. The reservoir control mechanism involving the three major factors of “cloud-karst-fault” was clarified, and karst cave, fracture fissure-pore, and cloud pore type reservoir models were established, thereby expanding the exploration potential. Controlled by the superposition of multi-stage tectonic processes during the Indosinian, Yanshanian, and Himalayan, two genetic buried hill trap types of uplift-depression and depression-uplift were formed. Based on the analysis of reservoir-forming factors of the Ordovician buried hill, three buried hill oil and gas reservoir-forming models were identified: low-level tectonic-lithologic composite quasi-layered buried hill, medium-level paleo-storage paleo-block buried hill, and high-level paleo-storage new-block buried hill. Comprehensive evaluations indicate that the reservoir-forming conditions of the low-level tectonic-lithologic composite quasi-layered buried hill in the northern portion of the Jizhong depression are the most favorable and that the Sicundian and Xinzhen buried hills are favorable areas for future exploration.