IP-VPN在政府及行业网络中的应用--以地震行业为例

以地震行业为例，叙述了政府及行业用户进行IP—VPN网络建设的必要性，分析了基于网络型的IP—VPN与基于用户设备型的IP—VPN的区别，MPLS／VPN技术在行业网络中的应用方法、路由的选择以及用户的接入方式等，指出，MPLS／VPN技术将成为政府、企业及行业用户解决专网平台的重要手段之一。     

基于MPLS VPN技术的地震行业网

对MPLS VPN技术进行简要分析,并以山东省临沂市费县芍药山乡的地震观测点为例,介绍如何使用MPLS VPN技术搭建地震行业网,并对山东省地震局现有的几种网络接入方式进行简要的比较分析.     

VPN技术在吉林九台非天然地震监测中的应用

以2019年吉林省九台非天然地震流动监测台网的建设工作为例,阐述了在野外非天然地震流动监测工作中,利用4G网络通信与L2TP VPN技术,将非天然地震监测系统接入地震行业网,实现对非天然地震监测设备的远程管理和数据处理。结果证明：通过此种方式接入到地震行业内网在应对突发地震事件上监测工作部署更加快捷、性价比更高。     

VPN技术在新疆地磁台阵中的应用

介绍了新疆地磁台阵的测点分布、测点设备构成情况以及运用VPN技术将地磁台阵观测系统接入地震行业网、VPN网络建设等情况。在新疆地磁台阵中应用VPN技术,实现了地震行业网对地磁台阵设备的远程管理和数据交换,随时获取数据信息,并能够对地震前后观测信息短临变化进行快速跟踪。     

VPN技术在地震监测网络远程维护中的应用

系统介绍了将VPN技术引入地震监测网络远程维护工作的技术思路，以及该技术思路在“中国地震局卫星数据通信网”中的实现方法。通过构建VPN网络，可以利用公共互联网资源，实现远程灵活、安全的接入局域网系统，显著提高了远程维护工作的效率。     

利用CDMA 1X+VPN技术实现十三陵地震前兆观测系统信息集成

依托“中国地震数据观测网络”项目,中国地震局地震预测研究所建立了以十三陵地震中心台为前兆台网部,8个无人值守的前兆台站为一体的前兆观测系统。 这套系统利用中国联通的CDMA 1X网络将台站接入到Internet网络,并利用VPN(Virtual Private Network)技术在Internet网络上开辟一条安全、 稳定传输隧道,实现了前兆台站、 观测设备与十三陵前兆台网部的信息集成。 文中以十三陵地震前兆观测系统为例,主要介绍了如何利用CDMA 1X 无线网络和VPN(Virtual Private Network)技术实现前兆观测系统信息集成。 十三陵地震前兆观测系统的正常运行证明,利用CDMA 1X +VPN技术的前兆观测系统组网模式可以做到投资少、 见效快、传输可靠等优势,值得推广应用。     

VPN技术及其在地震信息广域网建设中的运用

利用VPN技术在省级地震信息网络中建设信息行业广域网,使之成为一个经济、安全、高效的数据和信息传输的基础平台。对“十五”期间的地震信息行业网络建设有一定的借鉴意义。     

VPN技术在广东省地震信息网的应用

VPN是一种新的网络技术，它提供了一种通过公用网络安全地对企业内部专用网络进行远程访问的连接方式。介绍了VPN技术的特点，并以广东地震信息网为例，说明如何在Windows 2000 Server环境下配置VPN拨入服务器。     

浅析3G技术在地震行业网络中的应用——利用GRE隧道实现3G无线网络接入

探讨如何利用GRE隧道实现3G无线接入地震行业网络的技术方案,并对中国联通的3G网络作基本分析,以流动观测台为例,简要介绍3G网络接入的应用成果.     

IPSec VPN系统在天津市地震局的应用

利用公众网络组建虚拟专用网(VPN)技术由于保密性高、应用灵活、价格低廉,近年来得到广泛引用。文章从IPSec VPN的基本原理、优缺点及常规实现方式出发,介绍了IPSec VPN在天津市地震局的实现以及实际应用情况,为行业网内有效使用VPN提供参考建议。     

A Monte Carlo study of rainfall forecasting with a stochastic model

A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities.     

Earthquake Engineering and Engineering Vibration Aims And Scope

正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and     

Foreword

Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States.     

WORLD ASSOCIATION FOR SEDIMENTATION AND EROSION RESEARCH(WASER)

正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study     

Enhancing remote sensing research on global change to improve our understanding on Earth system processes

正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases     

Solute concentrations in the lower niger river and the source rock contribution

Water quality analyses for the Niger River for the 1980/81 hydrological year are presented. The samples were collected from the main river at Lokoja, and from two main tributaries, the Kaduna and the Benue Rivers. Different water types were distinguished by the concentrations of major ions. The type Ca > Na > Mg > K - HCO₃ > SO₄ > Cl was represented at all stations during at least part of the year. Chloride was found to dominate the sulphate ion in the Kaduna and Niger, while the Benue maintained a higher concentration of sulphate relative to chloride all year round. Distinct patterns of seasonal variation in the ion concentrations were observed, particularly for the samples collected at Lokoja. Low ion concentrations were prominent during periods of high discharge, while low flow periods coincided with high dissolved ion concentrations. The contribution of rainwater to the total dissolved solids in the river waters was assessed indirectly using rainwater chemistry data from the Gulf of Guinea. The estimated rainwater contribution to the Lower Niger amounts to 5.15 mg 1^?1. Geochemical weathering calculations involving reactions of the four major minerals of granitic rocks - anorthite, biotite, albite, and K-feldspar - with carbon dioxide and water, can account for the average water composition of the Lower Niger. The proportion of the ionic components was also related to the occurrence of the respective element in the minerals.