AN ANALYSIS OF WATER RESOURCE CHARACTERISTICS OF THE RIVERS IN THE NORTHERN SLOPE OF THE KUNLUN MOUNTAINS

ＡＮＡＮＡＬＹＳＩＳＯＦＷＡＴＥＲＲＥＳＯＵＲＣＥＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＴＨＥＲＩＶＥＲＳＩＮＴＨＥＮＯＲＴＨＥＲＮＳＬＯＰＥＯＦＴＨＥＫＵＮＬＵＮＭＯＵＮＴＡＩＮＳＸｕＹｏｕｐｅｎｇ（许有鹏）；ＧａｏＹｕｎｊｕｅ（高蕴珏）（Ｄｅｐａｒｔ...     

Aspherical accretion of cosmic strings

A simulation of accretion of a string loop has been done. It shows that aspherical accretion is essential for large-scale loops. All configurations found in the distribution of galaxies, such as filaments, pancakes, bubbles, and voids, can be formed by the accretion of cosmic strings.     

cD Abell团的空间相关函数ξ(r)

利用估计红移对Abell统计样品中的cD团进行了空间两点相关函数的计算,确证了cD团的相关性质;特别指出了在特大尺度～300Mpc(H_0=100km·sec~(-1)Mpc~(-1))上cD团仍有一定的相关,而且cD团与射电源和超星系团之间可能存在着空间分布上的联系和对应,显示了更大尺度上可能的成团相关性。     

深源远震波形反演介质层状结构

在远场正演计算的基础上，运用３０°～９０°的四个不同深源远震记录波形，通过试错法选取台站下方的结构，借助波场反向重建算法，反演确定宜昌台站下方的速度结构。这一算法的实现有助于提高用试错法所得结果的可靠性和精确度，对于利用天然地震资料研究地球深部构造有一定的实用价值。     

500hPa环流变化与山东春季降水异常

应用SVD技术,诊断分析了北半球500hPa高度场与山东春季降水的关系。结果表明：山东春季降水与北半球500hPa高度场关系密切,山东春季降水与东亚上空500hPa高度场具有很好的同步联系。前期(冬季)日本东北部500hPa高度场是影响山东南部春季降水的关键区,具有预测意义。500hPa高度距平场东高西低型是造成山东春季降水的主要大气环流形势,西高东低型是造成山东少雨的主要大气环流形势。     

Zonal propagation of kinetic energy and convection in the South China Sea and Indian monsoon regions in boreal summer

As early as in the 1980s, Chinese scientists hadfirst proposed that there exits two summer monsoonsystems in Asia, namely the East Asian summer mon-soon (EASM) and the Indian summer monsoon(ISM)[1-4]. The two monsoon systems are quite dif-ferent in characteristics. Since then, such issue andconclusion had been documented and approved by alot of studies in the past two decades, and was appliedin the guideline of the South China Sea summer mon-soon experiment (SCSMEX), which was undertak…     

关于下一代地震区划图编制原则与关键技术的初步探讨

本文在回顾我国四代地震区划编图原则的基础上,结合对未来我国社会经济发展状况和国家地震安全政策变化的分析,同时对国际上地震区划研究进展与编图工作的现状了解,探讨了下一代地震区划编图的基本原则,提出了与之相关的基本科学技术问题,对第五代地震区划图的编制提出了初步的建议。     

甘肃省农村民居抗震设防现状与地震安全农居示范工程对策

本文根据甘肃省农村社会经济发展和地震环境特征,简要分析了甘肃农村民居主要建筑结构类型和抗震性能,结合近10多年来破坏性地震资料,总结了农村民居主要震害特点,提出了实施甘肃省农村民居地震安全工程的对策与措施。     

Effect of sediment resuspension on underwater light field in shallow lakes in the middle and lower reaches of the Yangtze River: A case study in Longgan Lake and Taihu Lake

Based on three continuous in situ underwater light field measurement under different wind waves conditions in Longgan Lake, Meiliang Bay of Taihu Lake in July 2003 and littoral zone near TLLER in July 2004, respectively, the effects of sediment resuspension caused by wind waves on PAR diffuse attenuation, absorption coefficients and euphotic depths are analyzed. In Longgan Lake, PAR diffuse attenuation coefficients during small, middle and large wind waves were 1.74, 2.02 and 2.45 m^?1, respectively, and the corresponding PAR spectral diffuse attenuations ranged from 0.98 to 2.97, 1.34 to 3.95 and 1.80 to 5.40 m^?1, respectively. In Meiliang Bay, PAR diffuse attenuation coefficients were 2.63, 3.72, 4.37 m^?1 during small, middle and large wind waves. PAR diffuse attenuation coefficients increased by 41% and 66% from small to middle, large wind waves, respectively. Absorption coefficients integrated over the range of PAR of CDOM, phytoplankton were 0.26, 0.28 m^?1; 0.76, 0.49 m^?1, respectively during middle and large wind waves. Absorption coefficients integrated over the range of PAR of non-algal particulate matter and total suspended particulate matter increased from 0.94 to 1.73 m^?1, and from 1.70 to 2.22 m^?1, respectively during middle and large wind waves. Relative contributions of absorption coefficients of non-algal particulate matter to total absorption coefficient integrated over the range of PAR were 44.14%, 65.05%, respectively, during middle and large wind waves. PAR euphotic depths decreased by 0.40, 0.19, 0.20 m from middle to large wind waves in Longganhu Lake, Meliang Bay and littoral zone near TLLER. Significant correlations were found between transparency, PAR diffuse attenuation coefficients, euphotic depths and total suspended particulate matter, wind velocity, wave height. Most significant correlations were found between transparency, PAR diffuse attenuation coefficients, euphotic depths and inorganic suspended particulate matter but low correlations for chlorophyll a, dissolved organic carbon. Increase of total suspended particulate matter, especially inorganic suspended particulate matter caused by wind waves was the dominant factor affecting underwater light field in shallow lakes in the middle and lower reaches of the Yangtze River based on observations at three stations.     

Theoretical analysis and engineering solution of parasitical spectrum in the CINRAD transmitter

To deal with the universal problem of parasitical frequency spectrum in China New Generation Weather Radar transmitter, this paper establishes mathematical models for parasitical signals existing in radar transmitters and analyzes their effects on weather radar performance. Based on an engineering analysis of their possible sources, a step-by-step method to eliminate parasitical spectrum is presented, which is applied to troubleshooting experimental weather radar. Eventually, parasitical spectrum is basically eliminated. As a result, improved spectrum purity and reduced phase noise is achieved. Moreover, accuracy for velocity estimate as well as ground clutter suppression ability of the radar system is enhanced.