基于SIM型密码卡的移动市场监管系统

为了提高市场监管电子政务系统的安全性,提出了一种基于SIM型密码卡的移动市场监管系统。在SIM型密码卡中存储电子政务数字证书作为用户身份识别标识并集成了加密算法,用户经认证网关识别通过后与移动接入区建立SSL VPN通道,访问权限由移动集成管理平台分配。该方案在用户端实施公私数据隔离,在政务网与互联网间进行安全接入控制,可有效提高政务网的安全性,降低管理复杂度并提高市场监管人员工作效率。

Secondary Structure Analysis of Native Cellulose by Molecular Dynamics Simulations with Coarse-Grained Model

The secondary structure of different Iβ cellulose was analyzed by a molecular dynamics sim- ulation with MARTINI coarse-grained force field, where each chain of the cellulose includes 40 D-glucoses units. Calculation gives a satisfied description about the secondary structure of the cellulose. As the chain number increasing, the cellulose becomes the form of a helix, with the diameter of screw growing and spiral rising. Interestingly, the celluloses with chain number N of 4, 6, 24 and 36 do show right-hand twisting. On the contrast, the celluloses with N of 8, 12, 16 chains are left-hand twisting. These simulations indicate that the cellulose with chain number larger than 36 will break down to two parts. Besides, the result indicates that 36-chains cellulose model is the most stable among all models. Furthermore, the Lennard-Jones potential determines the secondary structure. In addition, an equation was set up to analyze the twisting structure.

上海锅炉厂有限公司循环流化床锅炉技术发展的现状

回顾上海锅炉厂有限公司循环流化床锅炉研究开发的历史，介绍近年来与中国科学院工程热物理所及三井造船合作开发的SIM型循环流化床锅炉的技术特征，分别叙述了75t／h、130t／h和410t／h循环流化床锅炉的设计概况。