1950年以来汾河水沙演变规律及影响因素分析

利用汾河河津水文站1950 年以来的水文资料, 应用多种统计分析方法, 系统分析了汾河水沙的季节及年 际变化规律, 并且对人类活动导致的年径流变化影响进行了估算。研究表明, 汾河流域水沙年内分配极不均匀, 年 内不均匀系数有明显上升趋势, 且越到近期稳定程度越低。水沙的年际变化剧烈, 且在20 世纪80 年代之后年径流 基本都是枯水时段。应用累积滤波器对汾河水沙变化趋势进行分析, 结果显示, 汾河流域水沙均呈减少趋势, 且泥 沙变化幅度大于径流变化。通过降水—径流双累积曲线及对天然径流的还原分析表明, 径流变化趋势在1964 年发 生明显偏离, 从多年平均值来看, 人类活动导致的径流减少量占径流减少总量的75.912%, 人类活动是汾河流域径 流减少的主要因素。     

Application research of narrow band Internet of things buoy and surface hydrodynamics monitoring

This paper applies the narrow band Internet of things communication technology to develop a wireless network equipment and communication system, which can quickly set up a network with a radius of 100 km on water surface. A disposable micro buoy based on narrow-band Internet of things and Beidou positioning function is also developed and used to collect surface hydrodynamic data online. In addition, a web-based public service platform is designed for the analysis and visualization of the data collected by buoys. Combined with the satellite remote sensing data, the study carries a series of marine experiments and studies such as sediment deposition tracking and garbage floating tracking.     

家用太阳能热水器防雷工程设计

通过对家用太阳能热水器结构以及它安装在屋顶的特殊性的认识,从直击雷防护和防雷电波侵入两个方面进行了讨论,并进行了相应的防雷工程设计。     

海南乐东降水特征与干旱及人工增雨潜力分析

利用海南省乐东县境内的乐东站和莺歌海盐场气象站及所属5个单位气象站1977~2006年的地面观测资料,对东县降水特征与干旱进行分析;并根据气象学原理对乐东县人工增雨潜力进行了分析,为当地政府进行抗旱减灾,找出了科学依据。     

Study on the isotherms of the interaction between suspended particles and Cu (II) in the Huanghe River

The isotherms of the interaction between the suspended particles and Cu²⁺, and the effects of lysine and asparaginic acid on the isotherms in the Huanghe (Yellow) River were studied by applying the theory and method of interfacial stepwise ion/coordination particle exchange. We obtained a new stepped river isotherm, formed by two curves joined together with a “plateau” in the middle. The adsorption equilibrium constantsK ₁ andK ₂ were calculated by using the isothermal equation of surface stepwise ion exchange. Amino acid in small amount promotes exchange adsorption of the suspended particles with Cu²⁺. The degree of promotive action relates to the isoelectric point of amino acid. The promotive effect of lysine is bigger than that of asparaginic acid. Project 29361001 supported by NSFC.     

Composition of plagioclases in volcanic rocks of King George Island, Antarctica with reference to the petrogenetic significance

Plagioclases occur mainly as phenocrysts in volcanic rocks of King George Island, South Shetland Islands, West Antarctica. In basaltic andesites and andesites of Keller Peninsula and Ullman Spur (Admiralty Bay), they are high structure state labradorite-andesines; and in high-A1 basalts and basaltic andesites of Barton and Weaver peninsulas (Maxwell Bay), they are high structure state bytownite-anorthites.∑REE, La/Yb ratios and δEu values of plagioclases from Admiralty Bay are higher than those from Maxwell Bay. All plagioclases have rather identical chondritenormalized transitional element distribution patterns, probably reflecting that crystal structure rather than composition of plagioclase controls their diversity. Compositions of plagioclases depend chiefly on those of their host rocks, compositional differences of plagioclases reveal that basaltic magmas in the Admiralty Bay area are more evolved than in the Maxwell Bay area.     

近42年雅鲁藏布江中游四季气温变化特征分析

利用 1957～ 1998年雅鲁藏布江中游拉萨、日喀则、泽当、江孜 4个站各月平均气温资料 ,通过线性趋势估计和多项式函数拟合分析了该流域春、夏、秋、冬 4季气温长期趋势变化和周期变化 ,并利用滑动T检验等方法讨论了气温突变的问题。结果表明 :在过去 4 2年里 ,雅鲁藏布江中游地区各季气温均有明显的上升趋势 ,其中冬春季增温显著 ,80年代初沿江四季气温除秋季外都出现了明显的增温突变     

中国地壳运动观测网络中的GPS数据流

介绍了中国地壳运动观测网络中的 GPS数据结构 ,对 GPS及其他观测数据的数据转换、数据传输、数据处理、管理及数据共享等工作流程作了详细说明。     

广州城市规划信息网中的Web GIS方案设计与应用

本文介绍广州市城市规划局规划信息网的GIS信息发布系统建设方案,本方案采用ESRI公司IMS 2 .0作为GIS发布服务器端软件,建立基于CGI的Web GIS系统,使用户实现WWW交互。本文从系统的硬件要求与软件需求以及服务器端服务应用程序、Web页面的开发等方面阐述了系统的建立与应用。     

唐古拉山侏罗系盖覆区空喀拉-温泉-澜沧江结合带鉴别标志

结合带局部地段被与结合带演化密切伴生的各类盆地盖覆是各造山带中的一种普遍现象 ,因而初步将盖覆结合带的盆地划分为二类 :一是以边缘前陆盆地为代表的盖覆结合带而不破坏结合带的纵向盖覆性盆地 ;二是以横推断层盆地为代表的盖覆且破坏结合带的横向破坏性盆地。区内海相侏罗纪盆地实为与空喀拉温泉澜沧江结合带演化密切相关的盖覆结合带的陆内俯冲型边缘前陆盆地。深部地球物理探测资料证实了结合带在盖覆层之下仍存在 ,更说明结合带两侧板块构造建造对比明显有异 ,分属两类不同性质的大陆边缘 ,进而得出了结合带在研究区内潜伏于盖覆层之下的结论 ,从而建立了结合带存在的三方面的鉴别标志