A Review Of Slr Contributions To Geophysics In Eurasia By Cgs

In the past 30 years the Satellite Laser Ranging(SLR) technique has improved to a large extent, currently achieving a ranging precision down toa few millimeters. Moreover the growth in the size of the international network of SLR stations and therapidly growing constellation of geodetic target satellites make the SLR a well established technique for solidEarth studies and for the related Earth subsystem sciences. The long SLR observation history has become a veryimportant source of data for global and local changes detection and monitoring in many different fields.Tectonic plate motion, crustal deformation, post-glacial rebound and subsidence, Earth rotation, and polarmotion, time variations of the Earth's gravitational field, ocean tides modeling, center of mass of the totalEarth system monitoring, International Terrestrial Reference System (ITRS) maintenance are only themain applications in which the SLR technique plays a significant role. Plate boundary zones in whichdeformation is diffuse are in general geographical areas associated with high seismic and volcanic activity.A principal key to understand the geophysics of a plate boundary process is the detailed knowledge of the3-D kinematics. This work will focus on the relevant results of the Eurasian SLR subnetwork in termsof technological evolution and crustal deformation. A general overview of the Eurasian SLR stationperformance will be presented with particular reference to the state-of-the-art SLR observatory MLRO (Matera LaserRanging Observatory). The current tectonic deformations (velocity and strain-rate field) detectedby the Eurasian network and by the former WEGENER/MEDLAS campaigns will also be discussed.     

湖南香花岭矿田一号锡多金属矿化带空间几何学的研究

香花岭矿田一号锡多金属矿化带中矿体与花岗岩体空间关系的统计研究发现：最有利于锡多金属矿体定位的空间条件是控矿断层与岩体交线上方１６０米左右范围的构造空间；相对较大和稳定的成矿温度场和较开放的环境是锡多金属矿体富集的重要物理化学条件。     

黄河流域水土流失遥感监测

以MSS、TM、ETM及CBERS遥感数据为主要信息源,辅以DEM、土地利用现状图及地质图等专题数据,通过信息自动提取的方法,结合人机交互解译和野外检查验证,编制各期水土流失现状图,再利用GIS空间分析得到不同时段水土流失变化图。监测结果表明,黄河流域水土流失面积达484737.20 km^2,占整个流域的61.04%。水土流失强度变化特征是1975-2000年加重区大于减轻区,2000-2007年减轻区大于加重区。     

空间大地测量技术对确定地面坐标框架、地形变与地球重力场的贡献和进展--出席2005年国际大地测量协会(IAG) 科学大会札记

国际大地测量协会（IAG）科学大会于2005年8月22~26日在澳大利亚凯尔斯（Cairns）召开。会议名称为“动力行星2005”（Dynamic Planet 2005）。会议就有关完善全球和地区性地面坐标参考框架、卫星重力测量在确定地球重力场时空分辨率、开展航空激光和雷达成像及其干涉技术在地形变和灾害监测,以及对大气的研究、建立和完善全球大地测量观测系统(GGOS)、开展行星大地测量的研究等方面的内容做了广泛的学术交流,内容比较丰富。     

Behavioral responses of California sea lions to mid-frequency (3250–3450 Hz) sonar signals

Military sonar has the potential to negatively impact marine mammals. To investigate factors affecting behavioral disruption in California sea lions (Zalophus californianus), fifteen sea lions participated in a controlled exposure study using a simulated tactical sonar signal (1 s duration, 3250–3450 Hz) as a stimulus. Subjects were placed into groups of three and each group received a stimulus exposure of 125, 140, 155, 170, or 185 dB re: 1 μPa (rms). Each subject was trained to swim across an enclosure, touch a paddle, and return to the start location. Sound exposures occurred at the mid-point of the enclosure. Control and exposure sessions were run consecutively and each consisted of ten, 30-s trials. The occurrence and severity of behavioral responses were used to create acoustic dose–response and dose–severity functions. Age of the subject significantly affected the dose–response relationship, but not the dose–severity relationship. Repetitive exposures did not affect the dose–response relationship.     

AC magnetic field measurements onboard Cross-Scale: Scientific objectives and instrument design

The ACB search-coil magnetometer for Cross-Scale will measure three components of the AC magnetic field up to 4 kHz, and one component up to 100 kHz. Turbulent and coherent magnetic field fluctuations in that frequency range play an important role in the acceleration, scattering, and thermalisation of particles. ACB will, together with the other instruments of the Cross-Scale wave consortium, allow to address the key science objectives associated with plasma waves. Here, we list some of the important issues, based on the experience drawn from Cluster, and describe the instrument.     

Comparative planetology, climatology and biology of Venus, Earth and Mars

Spacecraft studies of the three terrestrial planets with atmospheres have made it possible to make meaningful comparisons that shed light on their common origin and divergent evolutionary paths. Early in their histories, all three apparently had oceans and extensive volcanism; Mars and Earth, at least, had magnetic fields, and Earth, at least, had life. All three currently have climates determined by energy balance relationships involving carbon dioxide, water and aerosols, regulated by solar energy deposition, atmospheric and ocean circulation, composition, and cloud physics and chemistry.This paper addresses the extent to which current knowledge allows us to explain the observed state of each planet, its planetology, climatology and biology, within a common framework. Areas of ignorance and mysteries are explored, and prospects for advances in resolving these with missions within the present planning horizon of the space agencies are considered and assessed.     

The application of GIS for flood defence in the Anglian Region: developing for the future

The spatio‐temporal relationship between unusual sightings of dead birds and human West Nile virus infections has been observed in many studies and has been proposed as an indicator of an intense amplification cycle between birds and mosquitoes. However, to date, no single study has provided quantitative evidence that the amplification cycle occurs at the local level and that it operates within certain temporal parameters. Here, we use a novel geostatistical and spatial analytic methodology and present the first evidence that the localized unusual space–time correspondence of dead birds models the amplification cycle and that this cycle peaks 15–16 days prior to human onset of West Nile virus infections. During the process of establishing this relationship, we extend the traditional Knox space–time interaction measure to overcome pair‐dependency limitations and use a novel implementation of the kappa non‐chance agreement measure to identify the temporal characteristics of the association of bird deaths to human West Nile infections.     

Ramadan and Bussorah Street: the spirit of place

The presence of ‘seasonal spaces’ such as the Ramadan-related activities associated with Bussorah Street, Singapore, during the holy Muslim month of Ramadan surfaces significant issues on the convergence and management of identity, heritage, space and conservation important to all Singaporeans. Conservation projects to ‘prettify’ or commodify the historic district of Kampong Glam, which contains Bussorah Street had to be revised to include the local tradition of the Ramadan food bazaar but at the adjoining Kandahar Street. Undoubtedly, what is being underlined by this seasonal space is the affirmation of identity, the reclamation of space and the possibility for improved management and economic viability of the Kampong Glam district. However, as stressed in the paper, that while the spirit of Bussorah Street can be construed as forms of spatial or cultural resilience, the new Malay Heritage Centre (Taman Warisan Melayu) located in the district acts as a strong reminder that, ultimately, ‘seasonal spaces’ are still subjected to the calculated considerations of the Singapore urban planners or the governing elite with significant implications for those with strong ethnic and religious connections with the area and its Islamic heritage.

日食电离层效应

本文分析了1987年9月23日日环食期间,我国14个电离层站和1988年3月18日日全食期间两个站的垂测仪和偏振仪记录,并综合50年代以来历次日食电离层效应的观测结果,证实:1.E层和F1层光食效应明显,F2层动力学效应显著;2.f0F2存在日食日值大于、小于或等于控制日值三种典型情况;3.TEC食变曲线有凹陷和不凹陷两种典型情况,甚至出现日食日值大于控制日值的异常现象. 本文对F2层和外电离层的动力学特征作了定性讨论,认为:空间等离子体温度急剧下降和沿场扩散是F2层和外电离层日食效应的最主要因素;而磁赤道上空等离子体的沿场扩散、“喷泉”效应,热层风和全（环）食带方位是影响位于磁赤道异常区各电离层站日食电离层效应的主要因素.