腐蚀环境中荷载作用对钢筋混凝土梁腐蚀的影响

对空气、淡水和盐水环境中的钢筋混凝土梁进行了静动力试验,测定了空气、淡水环境和盐水环境中静力荷载、高周疲劳荷载所引起的钢筋混凝土梁腐蚀电位的变化,进而推断静力荷载、高周疲劳荷载对钢筋腐蚀的影响．结果表明：腐蚀环境和荷载作用对构件钢筋的腐蚀都有明显的影响,且腐蚀环境和荷载作用对钢筋腐蚀有耦合作用;盐水环境中钢筋的腐蚀速度快于淡水中的腐蚀速度,疲劳荷载作用下钢筋的腐蚀速度快于同幅度静力荷载作用下的腐蚀速度．对于实际工程中的结构,限制和减轻腐蚀环境与荷载作用的耦合,是提高结构耐久性的一个重要方面．     

青海湖环湖区蝗虫与地貌类型关系的研究

蝗虫对青海湖环湖区的草地有相当严重的危害．摸清蝗虫发生与其生态条件之间的关系,是进行蝗虫有效防治的前提．不同类型的地貌通过其对水热条件的重新分配对蝗虫的发生有不同的影响．作者根据野外实地调查资料,就环湖区蝗虫发生与湖滨阶地、构造台地及山坡地等该区主要地貌类型与蝗虫密度的关系进行了初步研究．     

两类高阶高次非线性差分方程的精确解

利用独立通解法(UGS)研究2类非线性差分方程的精确解,得到了一类非线性齐次差分方程的精确解,它由若干个独立通解共同构成,且独立通解的个数与差分方程的阶数n和方程的次数m的乘积mm无关;还得到了一类非线性非齐次差分方程的一组特解.     

基于蚁群算法的多QoS约束海量数据网格任务调度

针对海量数据计算网格任务调度问题,提出一种多Qos约束网格任务调度蚁群改进算法,优先考虑与数据存储网格结点间数据传输效率高、完成任务概率高的网格计算资源,通过调整蚁群算法中信息素挥发因子和传输导向因子的更新方法来提高算法的收敛速度和全局最优解搜索能力,从而达到调度目标最优.仿真实验结果表明,该算法与QoS-Min-min和QoS-Sufferage等同类算法相比,具有较好的综合性能,特别是在计算数据文件较大时,该算法在收敛速度和全局最优解搜索能力方面有明显的提高.     

离子聚合物金属复合材料电致动特性数值模拟

基于ANSYS参数化开发平台,通过编制龙格-库塔算法用户子程序求解离子浓度偏微分方程,采用温度场模型等效模拟水分子重新分布引起的机械变形,制定分析流程,对离子交换膜金属复合材料(IPMC)的电致动特性进行了数值模拟.研究了在外加电场作用下,Na 迁移运动规律与IPMC变形过程特征,通过结果比较证明了所提出方法的正确性.     

基于遗传神经网络的数字化渐进成形回弹预测

针对传统BP神经网络具有易陷入局部极小等缺陷,采用遗传算法(GA)对BP神经网络(初始权值、阈值)进行了优化,将人工智能技术和激光扫描测量技术有机结合,建立了金属板材数字化渐进成形回弹预测的遗传神经网络模型,对计算结果与BP神经网络预测结果进行比较,表明遗传神经网络预测值与实测值之间具有很高的相关性和精确度,该模型可用于预测渐进成形工艺参数与回弹量之间的映射关系,为金属板材数字化渐进成形回弹量的预测开辟了一条新的途径.     

空间信息网络中的资源映射与调度研究

目前空间信息网络中卫星资源不尽相同,且卫星节点的星间链路动态变化,给资源映射造成困难,使得网络资源利用不充分.如何实现空间资源利用的最大化,成为亟待解决的难题.为解决上述问题,提供了一种方法:首先,将卫星网络可以提供的资源和任务指标映射表达为多维矢量;再通过线性规划,使资源矢量和任务矢量相匹配,从而使网络资源能更充分地被利用.     

Influence of graphene microstructures on electrochemical performance for supercapacitors

The influence of variant graphenes on electrochemical performance for supercapacitors was studied comparatively and systematically by using SEM, FTIR and Raman spectroscopy, cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS). The results revealed that: 1) the nitrogen-doped graphene (N-G) electrode exhibited the highest specific capacitance at the same voltage scan rate; 2) the specific capacitance of the N-G reached up to 243.5 F/g at 1 A/g, while regular graphite oxide (GO) was 43.5 F/g and reduced graphene oxide (rGO) was 67.9 F/g; 3) N-G exhibited the best supercapacitance performance and the superior electrochemical properties, which made it an ideal electrode material for supercapacitors.     

Studies on China graphene research based on the analysis of National Science and Technology Reports

The study tries to reveal the situation and development trends of China's graphene research utilizing National Science and Technology Reports (NSTR) as the new data resource.Findings show a continual increase of graphene projects sponsored by the government.Most of them are from the National Basic Re-search Program of China and the National High-tech R&D Program, which reflects mainly aiming for breakthroughs of China's graphene research in major frontier fields and promoting industrial competitive-ness.As a new material in nanometer area, the graphene research mainly focuses on nanometer research area.Besides, it has also involved more in the promising applications, such as advanced energy technol-ogy, biological and medical technology, testing and analytical instrument technology, etc.Major players are universities and research institutes, and they have collaborated a lot.Few enterprises have played an important role in the collaboration network, so China' s graphene research is still mainly in the basic re-search step.Key scholars with their research interests have been revealed.