基于HBase的空间矢量数据存储模型设计与优化

数据存储模型是数据库模型的重要组成部分。本文针对目前关系型空间数据库发展过程中遇到的瓶颈问题以及采用HBase管理空间矢量数据存在的问题,在分析关系型空间数据库存储模型的基础上,将关系型数据库存储模式向HBase存储模式转换规则应用到空间矢量数据管理领域,提出了空间矢量数据关系存储模式向HBase存储模式转换方法,设计了一种空间矢量数据HBase存储模型。利用HBase的实体嵌套、反范式化、无模式等特性,对模型进行了优化完善。通过试验验证了在没有辅助索引情况下,本文设计的存储模型查询效率优于目前常用的基于HBase的空间矢量数据存储模型。     

Diopside and Magnetite Exsolutions in Olivine from Lower Cr# Dunite in the Dongbo Ophiolite, Southern Tibet

<正>Diopside and magnetite exsolutions occur as oriented intergrowths within olivine of the lower Cr~#dunite in the Dongbo ophiolite,Tibet.The fresh lower Cr~#dunite has a mineral assemblage of olivine,spinel and diopside.The Fo content of its olivine is 90–92,which is lower than that of the higher Cr~#dunite lenses(Fo92-Fo94)without     

小河金矿的细菌预氧化研究

陕西旬阳小河金矿的浮选金精矿含砷（２０－２７％）,采用细菌预氧化时较为困难。采用不同方式对有Ｔ．ｆ菌进行驯化,有效地提高了细菌的氧化活性,金的浸出率从０．６％提高到８５．１２％。     

海底管道检测中侧扫声纳声波掠射角的优化设计

针对利用侧扫声纳检测海底管道时因其检测声影图像模糊而导致管道悬空高度检测误差过大的问题,提出了侧扫声纳声波掠射角优化设计的思路及方法。阐述了利用侧扫声纳对海底管道进行检测的工作原理,并利用海底管道和海底底质反向散射强度的计算公式探讨了声波在海底的反向散射强度、侧扫声纳声影图像的质量以及声波掠射角的取值这三者之间的关系对海底管道悬空高度h计算精度的影响,从理论上确定声波掠射角最佳取值范围的存在。通过工程实例的现场检测与比对试验,获得了在本试验所处海域环境中利用侧扫声纳检测海底管道时声波掠射角的最佳取值范围,对于类似的海底管道检测工程具有一定的指导意义。     

SLIP OFFSET ALONG STRIKE-SLIP FAULT DETERMINED FROM STREAM TERRACES FORMATION

Slip rate is one of the most important parameters in quantitative research of active faults. It is an average rate of fault dislocation during a particular period, which can reflect the strain energy accumulation rate of a fault. Thus it is often directly used in the evaluation of seismic hazard. Tectonic activities significantly influence regional geomorphic characteristics. Therefore, river evolution characteristics can be used to study tectonic activities characteristics, which is a relatively reliable method to determine slip rate of fault. Based on the study of the river geomorphology evolution process model and considering the influence of topographic and geomorphic factors, this paper established the river terrace dislocation model and put forward that the accurate measurement of the displacement caused by the fault should focus on the erosion of the terrace caused by river migration under the influence of topography. Through the analysis of the different cases in detail, it was found that the evolution of rivers is often affected by the topography, and rivers tend to migrate to the lower side of the terrain and erode the terraces on this side. However, terraces on the higher side of the terrain can usually be preserved, and the displacement caused by faulting can be accumulated relatively completely. Though it is reliable to calculate the slip rate of faults through the terrace dislocation on this side, a detailed analysis should be carried out in the field in order to select the appropriate terraces to measure the displacement under the comprehensive effects of topography, landform and other factors, if the terraces on both sides of the river are preserved. In order to obtain the results more objectively, we used Monte Carlo method to estimate the fault displacement and displacement error range. We used the linear equation to fit the position of terrace scarps and faults, and then calculate the terrace displacement. After 100, 000 times of simulation, the fault displacement and its error range could be obtained with 95%confidence interval. We selected the Gaoyan River in the eastern Altyn Tagh Fault as the research object, and used the unmanned air vehicle aerial photography technology to obtain the high-resolution DEM of this area. Based on the terrace evolution model proposed in this paper, we analyzed the terrace evolution with the detailed interpretation of the topography and landform of the DEM, and inferred that the right bank of the river was higher than the left bank, which led to the continuous erosion of the river to the left bank, while the terraces on the right bank were preserved. In addition, four stages of fault displacements and their error ranges were obtained by Monte Carlo method. By integrating the dating results of previous researches in this area, we got the fault slip rate of(1.80±0.51)mm/a. After comparing this result with the slip rates of each section of Altyn Tagh Fault studied by predecessors, it was found that the slip rate obtained in this paper is in line with the variation trend of the slip rate summarized by predecessors, namely, the slip rate gradually decreases from west to east, from 10~12mm/a in the middle section to about 2mm/a at the end.     

新流动范式下非流动性的研究进展与展望北大核心CSCDCSSCI

新冠疫情下的中断与非流动性改变新流动性范式的叙事逻辑,作为现代社会基本原则的流动性受到挑战与质疑,而正确认识非流动性事关新流动范式的未来转向与变革。为此,本研究对新流动范式下的非流动性研究进行综述,思考流动性与非流动性的辩证关系,为新流动范式的转型提供新的路径。本研究发现,新流动范式下非流动性的研究领域具有四个重要转向:从批判解构到辩证关系的认识;从本体不可能到有可能的思考;从宏观视野到微观解释的叙述;从方法二元到方法平衡的转变。同时,非流动性研究中存在四大重要议题:地方性非流动人口;支撑性的停泊空间;非表征的静默身体;跨时空的节点主体。最后,本研究为非流动性的未来研究提出相关展望:关注非流动性的人口异质性;关注多样化的非流动性空间;认识后人类技术与非流动性身体;探讨可持续发展的流动性。     

东准噶尔晚石炭世构造体制转变:来自A2型流纹岩的证据

老爷庙地区位于东准噶尔东部,是中亚造山带的重要组成部分。老爷庙流纹岩与典型A型花岗岩相似,成因类型上属A2型流纹岩,产于后碰撞环境。锆石U-Pb定年显示其形成于（311.6±3.1） Ma,属晚石炭世。综合文中数据及区域地质特征,老爷庙地区在晚石炭世已经拼贴到西伯利亚板块,进入后碰撞向板内转化的过渡期,结束了该区洋陆过渡环境。     

南京秦淮河流域汉府街第四纪标准钻孔研究及其地质意义

       根据对南京秦淮河流域第四系标准钻孔（钻孔编号：N06S6）系统的岩性描述、沉积相分析、采样测龄和孢粉分析,初步提出了南京秦淮河流域第四纪晚期地层的划分方案,建立了秦淮河流域晚第四系河流相地层单位--汉府组,并依据N06S6钻孔显示的岩性及其沉积相差异,将汉府组进一步划分为上、中、下3个岩性段。在此基础上,结合孢粉的研究结果,将本地区植被演替、气候波动变化恢复为5个阶段,并与前人的相关研究成果进行了对比。结果表明,南京地区晚更新世以来地形、地貌大体相似,总体面貌变化不大,反映这一时期本区新构造运动较弱。     

长江中下游六省大气甲烷柱浓度时空分布

甲烷(CH₄)是造成气候变暖的主要温室气体之一。为了了解长江中下游水稻种植区CH₄浓度的分布情况,本次研究基于温室气体观测卫星(greenhousegasesobservingsatellite,GOSAT)和大气红外探测仪(atmospheric infraredsounder,AIRS)卫星反演的数据产品,对我国长江中下游六省大气CH₄柱浓度的时空分布特征进行了研究。研究结果表明,由GOSAT反演的长江中下游六省大气CH₄浓度呈逐年增长趋势,其年均浓度由2011年的1817×10^-9增长至2018年的1875×10^-9,高于东三省、华北平原和全国平均水平。区域平均年增长量为8.2×10^-9 a^-1。各省年际增长幅度略有差异,纬度偏低的江西、湖南和浙江三省大气CH₄浓度高且增长量偏大,纬度偏高的湖北、安徽和江苏三省大气CH₄浓度略低且增长量偏小。长江中下游六省大气CH...     

Ecological indicators showing the succession of macrofauna communities in Sonneratia apetala artificial mangrove wetlands on Qi’ao Island at Zhuhai, South China

The Sonneratia apetala artificial mangroves in the intertidal zone of Da Wei Bay at Qi’ao Island of Zhu-hai, South China were chosen as the macrofauna succession plots while bare tidal flats of the same size were established as control plots in surrounding interference-free areas. Conventional change indicators of community structure, such as biomass and biodiversity, and indicators, such as exergy and specific exergy, which reflect the information change of overall communities, were used to analyze the succession of macro-fauna communities inS. apetala artificial mangroves. The similarities and differences in variation tendency of the different ecological indicators and their reflected ecological principles were compared. The results showed that from D-1 to D-1275 after plantingS. apetala, the biomass of the macrofauna communities first increased, which was then followed by an increase in the network relationship between the macrofauna communities （analysis of the Pielou evenness index and Shannon-Wiener diversity index）. The system in-formation （specific exergy） increased the slowest. Between D-1460 and D-2370 after plantingS. apetala, there was a decrease in biomass, network structure, and system information in the succession plots. After the decrease in the system information （the specific exergy）, there was a decline in the network relationships （Pielou evenness index and Shannon-Wiener diversity index）. Biomass was the last indicator to decrease. The similarities and differences among the different ecological indicators varied during the succession pro-cess, which reflected the relativity and differences among the indicators. This study suggested that, although the species diversity index can be an effective indicator of two types of changes （network structure and system information）, it was quite clear that species diversity measurement was not suitable for expressing the changes in biomass during the succession process. While exergy and specific exergy can provide useful information