虚拟现实的宽阔前景

虚拟现实技术是信息科学当前研究热点之一.本文在阐述虚拟现实技术的同时,探讨了虚拟现实技术和GIS技术结合的方式和途径,并将这两者的结合划分为三个阶段.并简述了虚拟现实技术对于“数字地球”和“地学信息图谱”发展的重要作用及其在地学中的应用.     

虚拟地理环境中时态信息可视化表达方法研究

介绍虚拟地理环境的基本含义，虚拟现实和可视化技术，探讨了线、面地理对象的时态信息表达方法。在此基础上，以近、现代黄河三角洲为例，给出了在虚拟地理环境中三角洲海岸线的变迁和三角洲地形地貌动态显示的方法。     

The Clock gene clone and its circadian rhythms in Pelteobagrus vachelli

The Clock gene,a key molecule in circadian systems,is widely distributed in the animal kingdom. We isolated a 936-bp partial c DNA sequence of the C lock gene( Pva- clock) from the darkbarbel catfish P elteobagrus vachelli that exhibited high identity with C lock genes of other species of fish and animals(65%–88%). The putative domains included a basic helix-loop-helix(b HLH) domain and two period-ARNT-single-minded(PAS) domains,which were also similar to those in other species of fish and animals. P va- Clock was primarily expressed in the brain,and was detected in all of the peripheral tissues sampled. Additionally,the pattern of P va- Clock expression over a 24-h period exhibited a circadian rhythm in the brain,liver and intestine,with the acrophase at zeitgeber time 21:35,23:00,and 23:23,respectively. Our results provide insight into the function of the molecular C lock of P. vachelli.     

中国华北地区地震空间数据仓库的构建与分析

空间数据仓库是在数据仓库基础上对空间数据的扩展。建设地震空间数据仓库对研究地震的时间、空间、时空上的发生、发展规律,及开展地震的预测、预报、防灾、减灾工作具有重要的指导意义。我国的华北地区地震活动频繁,地震记录从历史、数量、完整性等各方面均优于中国其他地区,因而尝试构建中国华北地区地震空间数据仓库,开展了空间数据仓库构建方法的研究。     

贵州后寨河喀斯特小流域水化学特征

通过分析后寨河流域内各测站的水化学资料,讨论了流域内各点的水化学类型及其空间分布,分析了水化学类型的形成原因,并详细讨论了水量的季节变化和人为因素对水中离子含量变化的影响。      

山东省地热资源分布与开发利用研究

山东省地热资源丰富,目前16地市均有地热资源分布.天然温泉共19处,位于威海、烟台、青岛、临沂、泰安5个地市,主要用于洗浴、理疗、休闲度假等.以齐河-广饶断裂、聊考断裂、沂沭断裂带为界,山东省共分为鲁东隆起地热区、沂沭断裂带地热区、鲁西隆起地热区和鲁西北坳陷地热区,区内人工开采地热井共1 160眼,主要用于供暖、洗浴、...     

全国农村民居抗震性能综述

地震灾害对农村的影响巨大,如何提高农村民居工程的抗震性能变得至关重要。通过文献调查、对比的方法,重点阐述全国农村民居的抗震性能现状,在对比基础上提出各地农村民居抗震性能的优劣情况,并探寻提高农村民居抗震性能的方式方法。     

墨江金厂金矿床金元素空间富集规律研究

运用数理统计和地质统计学方法,从矿区地层岩性、构造、岩浆岩、矿体的空间分布等方面研究了墨江金厂金矿床金元素的空间富集规律。结果表明,金元素空间分布总体上遵循左偏对数正态分布,为两个正态分布的混合,金品位平均值分布区构成了矿化区的主体;金矿体较集中分布于三叠系底板起伏较大的地段,富集方向主要呈北西、北西西向,矿体厚度、品位变化大;北西向断层组较北北西向断层组易于金元素的矿化富集,形成大矿体;矿体金品位一般有远离岩体升高、靠近岩体降低的趋势。     

基于 HBase 的面向语义单元的室内移动对象索引

随着室内定位技术的广泛应用,传感器记录了大量室内移动对象的位置数据,而索引技术作为移动对象数据分析的基础工作也得到越来越多的研究。已有索引技术多是针对室外空间的移动对象,不能支持室内移动对象数据的三维立体性、轨迹的复杂性、随机性等特点,这些索引技术也仅仅关注了移动对象的位置信息,忽略了语义信息,不能有效地支持室内移动对象的管理和分析,并且当面对海量的移动对象数据时,这些架构在传统关系型数据库上的索引都存在性能瓶颈问题。因此,本文提出了面向语义单元的移动对象表达模型,利用语义单元将室内移动对象的位置语义化,设计了SCoII （Semantic Cell Oriented Indoor moving objects Index）索引结构对室内移动对象的历史数据进行索引,能够有效支持语义粒度上的时空范围查询、移动对象语义轨迹查询。索引基于HBase实现,能够适应大规模的并发更新与查询,具有良好的规模扩展性,规避了大数据给传统数据库带来的性能瓶颈问题,实验证明其具有良好的更新和查询性能。该索引的实现方便了基于语义的室内移动对象分析和数据挖掘工作,为今后的分析工作奠定了基础。     

Occurrence and composition of sphene from eastern fold belt, Mount Isa Inlier, Cloncurry, northwestern Queensland, Australia

Sphene is very common in rocks including albitized granite, dioritic porphyrite, calcsilicate rock and breccia from the eastern fold belt of Mount Isa Inlier, Cloncurry. Two stages of sphenes are present in these rocks. First-staged sphene is relatively fine, euhedral, some grains show round or patchy zoning; second-staged sphene is relatively large, anhedral to subhedral, some grains show patchy zoning;both possibly contain rutile, ilmenite and magnetite inclusions. All sphenes are of low-Al type. The second-staged sphene has lesser Fe apfu than the first-staged sphene. Light-color part of the sphene has bigger Fe apfu than the dark-color part, as observed on one individual grain of sphene with patchy zoning, the average Xro of the sphene with patchy zoning is greater than that of the sphene without patchy zoning. Because the sphenes are taken from different types of rocks, Si, Ti, and Al have variable relations with F OH apfu. Si and Ti are not correlated with OH F in all analyzed samples ; Fe is correlated with OH F in the sphene just from granite and dioritic porphyrite; Al is correlated with OH F in the sphene fromgranite and breccia and is not correlated with OH F in the sphene from the dioritic porphyrite and calcsilicate rocks. The first-staged sphenes were possibly formed in the processes of magmatism and metamorphism. The second-staged sphenes were formed as a result of the breakdown of hornblendes and biotites in the process of Na (Ca) -metasomatism.