构建出口水产品技术性贸易壁垒防护体系的探讨——以广东为例

国外技术性贸易壁垒(TBT)已成为制约广东水产品出口的最大障碍。根据技术性贸易壁垒的概念和特点,提出针对国外技术性贸易壁垒,构建政府、行业协会和企业三位一体的应对与防护体系,并从制度、政策、人才和经费保证该体系的有效运行,发挥其在预警、示范和保护等方面的功能。     

Fisheries and failing states: The case of Sierra Leone

Marine fisheries play an important role in the economy of Sierra Leone, supporting livelihoods and contributing significantly to food security. This paper looks in detail at how the performance of fisheries was impacted by the ten year civil war, an event which contributed to the country's reputation for being a “failed state”. The paper focuses mainly on the artisanal fisheries sector, which employs the majority of the country's coastal population, and demonstrates how the conflict caused major social dislocation to fishing communities as well as reducing the productive capacity of the fleet. The paper concludes with a discussion of the policy challenges now facing Sierra Leone, particularly the prevention of resource looting through illegal fishing of the offshore stocks and the development of strategies to enable the potential wealth of these fisheries to be captured.     

On the Exceedance Probabilities of Extreme Drift Motions of An Offshore Structure

The response statistics of a compliant offshore structure excited by slowly varying wave drift forces is calculated by use of a numerical path integral solution method,rlhe path integral solution is based on the Gauss-Legendre interpolation scheme,and the values of the response probability density are obtained at the Gauss quadrature points in sub-intervals.It is demonstrated that a distinct advantage of the path integral solution is that the joint probabihty density of the response displacement and velocity is one of the by products of the calculations.This makes it possible to calculate the mean level up-crossing rates,which provides estimates of the exceedance probabilities of specified response levels for given time periods.     

2-D Numerical Simulation of Natural Gas Hydrate Decomposition Through Depressurization by Fully Implicit Method

Natural gas hydrate, as a potential energy resource, deposits in permafrost and marine sediment with large quantities. The current exploitation methods include depressurization, thermal stimulation, and inhibitor injection. However, many issues have to be resolved before the commercial production. In the present study, a 2-D axisymmetric simulator for gas production from hydrate reservoirs is developed. The simulator includes equations of conductive and convective heat transfer, kinetic of hydrate decomposition, and multiphase flow. These equations are discretized based on the finite difference method and are solved with the fully implicit simultaneous solution method. The process of laboratory-scale hydrate decomposition by depressurization is simulated. For different surrounding temperatures and outlet pressures, time evolutions of gas and water generations during hydrate dissociation are evaluated, and variations of temperature, pressure, and multiphase fluid flow conditions are analyzed. The results suggest that the rate of heat transfer plays an important role in the process. Furthermore, high surrounding temperature and low outlet valve pressure may increase the rate of hydrate dissociation with insignificant impact on final cumulative gas volume.     

地理信息公共服务平台广域网设计

在分析地理信息在线服务需求的基础上,重点讨论了满足地理信息公共服务平台要求的广域网拓扑结构、数据传输和交换技术,并给出了广域网IP地址与域名规划、节点网络接入、运行管理和网络安全等方面的设计方案。     

Secure Socket Layer协议在电子政务系统安全建设中的应用

针对目前日益突出的电子政务安全问题,在Secure Socket Layer协议的基础上,对我国电子政务的安全问题进行探讨,并针对目前政府机构信息化建设中的数据安全传输问题提出几点改进工作方案。     

信息化建设中信息安全的定位和构筑策略

信息安全事件的不断增多使得在信息化建设中信息安全受到越来越多的重视。如何在信息化建设中更好的规划和应用信息安全,确保信息化建设的成功是本文关注的重点。本文从技术和管理两个方面对信息安全涉及到的内容进行了阐述,并结合信息系统等级保护,探讨了在信息化建设中如何从宏观和微观两个角度进行信息安全建设。     

GPS工程控制网基线解算优化的探讨

对GPS基线解算的原理、影响因素和精度指标进行了分析,并结合Trimble Geomatic Office软件的基线解算实例阐述了具体的基线解算优化方法。     

移动自组织网络安全性研究与思考

分析研究移动自组织网络面临的一系列安全问题,总结针对移动自组网安全开展的研究方向,分别从网络安全体系结构和密钥管理两大基础核心领域进行分析和讨论,并提出一些政策建议。     

Ecological Effects of Remote Smallsand Descending on Urban Area: Deduced from the "Mud - Snow" in Changchun City

IntroductionContinued sandstorms occurring in North Chinaeally this year have attracted close attention of manyscientists from different aspects. It is recorded thatserious sandstorms occurred eight times in China in1960' s, thirteen times in 1970, s, fou…