中国发展电子商务的信用障碍及重建

信用是电子商务的灵魂，没有信用的支持，电子商务就不可能获得长足的发展。中国发展电子商务与发达国家巨大差距的原因不在技术而在信用障碍，因此，重构信用体系是中国发展电子商务的重大课题。     

分布式防火墙技术及应用

分布式防火墙是指那些驻留在网络中主机如服务器或桌面机并对主机系统自身提供安全防护的软件。本文在分析传统防火墙的特点和存在的问题的基础上,讨论了分布式防火墙这种新的防火墙体系结构及其技术特点,最后介绍一个应用实例。     

网络对大学生的负面影响及对策

网络在给大学生带来前所未有的挑战的同时 ,也对他们的心理、行为产生了一定的负面影响。因此 ,我们必须建立相应的法律法规 ,趋利避害地应用好网络 ,采取正确引导、规范言行等对策 ,切实减少网络对当代大学生的负面影响     

视觉文化与现代教育技术教学

视觉文化随着互联网的快速发展已逐步发展成当今文化的主流。它提供给人们一种全新的视角和研究领域。教育技术的多媒化特征注定与其有着天然联系。视觉文化全面渗透教育领域的事实对教育技术工作者提出了新的要求和任务。     

The Risk of MTBE Relative to Other VOCs in Public Drinking Water in California

Ongoing publicity about methyl tertiary butyl ether (MTBE) suggests that this chemical is of greater concern than other contaminants commonly found in drinking water. The purpose of this article is to evaluate the available MTBE data in context with other volatile organic compounds (VOCs) that are detected in public drinking water sources in California. We find that of the 28 VOCs with a primary maximum contaminant level (MCL) in California, 21 were found in 50 or more drinking water sources from 1985 to 2002. Over the last 10 years, the most frequently detected VOCs were chloroform, tetrachloroethylene (PCE), and trichloroethylene (TCE), which were found in about 9-15% of all sampled drinking water sources. These same chemicals were found to have the highest mean detected concentrations over the last 5 years, ranging from 13 to 15 microg/L. Many VOCs were also found to routinely exceed state and federal drinking water standards, including benzene and carbon tetrachloride. By comparison, MTBE was found in approximately 1% of sampled drinking water sources for most years, and of those drinking water sources found to contain MTBE from 1998 to 2002, over 90% had detected concentrations below California's primary MCL of 13 microg/L. Relative to the other VOCs evaluated, MTBE has the lowest estimated California cancer potency value, and was found to pose one of the least cancer risks from household exposures to contaminated drinking water. These findings suggest that MTBE poses an insignificant threat to public drinking water supplies and public health in California, particularly when compared to other common drinking water contaminants.     

基于BP神经网络的供应链绩效评价模型

应用平衡计分卡理论为供应链绩效建立平衡计分卡,可以从财务,客户满意度,内部业务流程,学习、成长性四个方面构建供应链绩效评价指标体系。利用BP神经网络建立供应链绩效评价模型,该模型能较好地避免传统方法人为选取权值和相关系数过程中的主观性和不确定性。     

因特网环境下图书馆运作模式的选择

在因特网的环境下 ,图书馆选择以服务为基础的运作模式 ,在激烈的行业竞争中展现自身的存在价值。图书馆员不但要具备使用资源、创造资源的技能 ,更重要的是要掌握教会别人使用资源和获得资源的技能     

网络思想政治工作的创新

随着时代的发展、科技的创新 ,新生事物不断涌现 ,冲击着我们的思想工作领域。面对这些变化 ,惟有创新思想政治工作 ,理论与实践相结合 ,与时俱进才能实现思想教育目的     

对电子期刊的理性思考

根据电子期刊的发展概况,理性地分析了电子期刊相对于印刷型期刊的优势和不足,论证了电子型期刊与印刷型期刊长期并存的观点。     

妇女信息系统建设探讨

根据国家计生委关于计生系统信息化建设的要求和全国建设妇女信息系统 (WIS)的现实条件 ,提出了利用分布式数据库和计算机网络等技术 ,建立一个从国家到基层乡镇都可实现数据集中与共享的新型WIS建设方案 ,并具体探讨了该系统的构成、运行机制、软件选择以及系统建设的几项重要工作。