多源异构地震数据的一体化编码和接口技术的设计与实现

以多源异构地震灾情数据为研究对象,针对震后灾情获取缓慢且碎片化、公众涉灾信息数据异构、多维、数据格式差异大、部分数据维度缺失导致的数据无法得到综合利用、决策支持不到位等问题,基于相关灾害信息标准化管理,提出多源异构地震数据的一体化编码和接口技术规范。根据此规范,设计实现了灾情数据的一体化编码管理以及基于开放式接口规范的灾情数据接入,从而实现了灾情数据入库、管理、实时发布的全周期一体化管理。同时,给出了多源异构应急信息大数据资源的统一表达模型,为震后应急管理提供了技术保障,提升了灾情数据管理效率。     

地震安评中地震活动性的统计区域与b值

本文讨论我国现行地震安全性评价中,地震活动性研究统计区域的选择及b值计算中存在的问题,提出不一定以地震区带作为统计区域的建议。文中同时指出,累计b值的正确概念应该是无震级上限累计b值,应采用迭代回归计算。文中用实际例子说明作者的建议。     

住宅现浇钢筋混凝土楼板裂缝成因及防治

在建筑工程中,现浇钢筋混凝土楼板出现裂缝的情况较多,这已成为影响住宅工程质量的一大通病。对其产生裂缝的原因进行了分析,并结合工程实际,就预防和综合治理提出了较全面的对策。     

基于GIS的不动产登记信息管理基础平台设计与实现

在我国全面实行不动产统一登记制度的背景下,为解决省、市、县三级不动产登记工作的标准化、互联互通以及数据共享等问题,在分析实际不足和需求的基础上,利用分布式地理信息系统、云计算等技术,提出了集省、市、县三级为一体的不动产登记信息管理基础平台建设的思路,构建不动产登记数据库,开发不动产登记信息管理基础平台,实现不动产登记数...     

Global distribution of summer chlorophyll blooms in the oligotrophic gyres

Chlorophyll blooms consistently develop in the oligotrophic NE Pacific in late summer, isolated from land masses and sources of higher chlorophyll waters. These blooms are potentially driven by nitrogen fixation, or by vertically migrating phytoplankton, and a better understanding of their ubiquity could improve our estimate of the global nitrogen fixation rate. Here, global SeaWiFS chlorophyll data from 1997 to 2007 are examined to determine if similar blooms occur in other oligotrophic gyres. Our analysis revealed blooms in five other areas. Two of these are regions where blooms have been previously identified: the SW Pacific and off the southern tip of Madagascar. Previously, unnoticed summer blooms were also identified in the NE and SW Atlantic and in a band along 10°S in the Indian Ocean. There is considerable variation in the intensity and frequency of blooms in the different regions, occurring the least frequently in the Atlantic Ocean. The blooms that develop along 10°S in the Indian Ocean are unique in that they are clearly associated with a hydrographic feature, the 10°S thermocline ridge, which explains the bloom within a conventional upwelling scenario. The environment and timing of the blooms, developing in oligotrophic waters in late summer, are conducive to both nitrogen fixers and vertically migrating phytoplankton, which require a relatively stable water column. However, the specific locations of the chlorophyll blooms generally do not coincide with areas of maximum levels of nitrogen fixation or Trichodesmium. The NE Pacific chlorophyll blooms develop in a region with a very high SiO₄/NO₃ ratio, where silicate will not be a limiting nutrient for diatoms. The blooms often develop between eddies, wrapping around the periphery of anti-cyclonic features. However, none of the areas where the blooms develop have particularly high eddy kinetic energy, from either a basin-scale or a mesoscale perspective, suggesting that other factors, such as interactions with a front or dynamics associated with the critical latitude, operate in conjunction with the eddy field to produce the observed blooms.     

关于测量标志保护与管理的思考

针对测量标志出现大量毁坏的原因,联系当前测量标志新形势的要求,提出了现阶段测量标志维护与管理的想法和建议.     

全球主要河流流域碳酸盐岩风化碳汇评估

碳酸盐岩风化吸收的大气CO₂主要以HCO₃ ^-形式连续地经由河流从大陆输送到海洋,成为陆地生态系统的重要碳汇。目前主要河流流域的碳酸盐岩风化碳汇估算存在不确定性,分布格局尚不清晰。基于GEMS-GLORI全球河流数据库提供的全球10万km ²以上主要河流流域多年平均监测数据,利用水化学径流法估算出全球主要河流流域碳酸盐岩对CO₂的吸收速率为0.43±0.15 Pg CO₂ yr ^-1,平均CO₂吸收通量为7.93±2.8 t km ^-2 yr ^-1。CO₂吸收通量在不同气候带下差异显著,热带和暖温带CO₂年吸收速率占全球主要河流流域年吸收速率的62.95%。冷温带CO₂年吸收速率占全球主要河流流域的33.05%,仅次于热带地区。本文划分出全球CO₂吸收通量的9个关键带,关键带的交汇处CO₂吸收通量较高。喀斯特出露流域碳酸盐岩对CO₂吸收通量的均值为8.50 t km ^-2 yr ^-1,约为非喀斯特流域的3倍。全球喀斯特出露流域碳酸盐岩风化碳汇在全球碳循环、水循环及碳收支平衡估算研究方面占据重要地位。     

X-ray activity from different types of stars

X-ray emission is an important indicator of stellar activity. In this paper, we study stellar Xray activity using the XMM-Newton and LAMOST data for different types of stars. We provide a sample including 1259 X-ray-emitting stars, of which 1090 have accurate stellar parameter estimations. Our sample size is much larger than those used in previous works. We find a bimodal distribution of the X-ray to optical flux ratio(log(fX/fV)) for G and K stars. We interpret that this bimodality is due to two subpopulations with different coronal heating rates. Furthermore, using the full widths at half maxima calculated from Hα and Hβ lines, we show that these stars in the inactive peaks have smaller rotational velocities. This is consistent with the magnetic dynamo theory that presumes stars with low rotational velocities have low levels of stellar activity. We also examine the correlation between log(fX/fV) and luminosity of the excess emission in the Hα line, and find a tight relation between the coronal and chromospheric activity indicators.     

连作马铃薯根系分泌物鉴定及其对尖孢镰孢菌(Fusarium oxysporum)的作用

为了揭示马铃薯连作化感物质与枯萎病之间的关系,通过水培和田间长期定位试验相结合方法,收集不同连作年限马铃薯根系分泌物,采用GC-TOF-MS进行分离鉴定.结果表明:在检测到的马铃薯根系分泌的48种物质中有机酸占30种.比较轮作、连作5年和连作10年马铃薯根系分泌物中有机酸的相对含量,发现苹果酸和棕榈酸的差异比较大.马铃...     

皖浙赣断裂带的界定及其基本特征

以往文献中及众多研究者所指的“皖浙赣断裂带”实际上包括了不同时代形成的、方向有变化的多组规模巨大的区域性断裂带;最早的断裂带形成于新元古代,最晚的形成于晚中生代。在地壳演化过程中,随着构造应力场的变化,不同时代的断裂带方向变化较大,新元古代晋宁期为北东向,早古生代加里东期为近东西向—北东东向,晚中生代为北北东向;每一期断裂带都有它们自己的大地构造背景和指示意义。文中认为,不同阶段形成的断裂带不能混为一谈。新元古代晋宁期的北东向断裂带南段基本上以赣东北蛇绿混杂岩带为代表,向北东延至皖南伏川断裂带,具有板块(或地体)边界断裂的性质;加里东期以近东西向祁门—歙县断裂带为代表,其西段被后期牵引成北东向,造成两侧的变质基底特征明显不同;二者均不属于皖浙赣断裂带的组成部分。而通常意义上所指的具有区域控岩控矿作用的皖浙赣断裂带,是晚中生代北北东向的赣东北—五城—歙县—绩溪—宁国断裂带,控制了侏罗—白垩纪红色盆地及燕山期岩浆岩的形成和分布,是一条具有控矿作用的重要的构造岩浆岩带。