降低风吹雪雪害辅助措施分析

为了便于公路风吹雪雪害防治科研成果的推广运用,结合科研课题的研究和公路建设的实践经验．客观地分析总结几种典型的降低公路风吹雪雪害的辅助措施,可以帮助人们少走弯路,收到事半功倍的效果。     

我的年轮 我的青海湖

这是第四届环湖赛，亚洲顶级自行车赛事．国际HC（horsclass），清晰地印在我二十岁的年轮上。她，在升级，我，在成长。两年的志愿翻译，在蜿蜒的车道上，陪着她。车轮飞转，我的年轮也如此……     

铁道机车车辆用牵引变压器

牵引变压器安装在交流电气化区间运行的机车车辆上,是电力机车、电动车组不可缺少的供电设备。介绍了新干线车辆用牵引变压器的技术发展历程,以及为实现牵引变压器轻量化采取的各种技术措施及取得的成效。同时,论述了近年来在研究开发超导牵引变压器以及中频变压器方面取得的新进展。     

崇启大桥环氧沥青铺装检测与养护技术研究

目前临海多孔连续钢箱梁桥面铺装检测养护技术研究较少,依托崇启大桥,针对桥面铺装使用7年出现的裂缝类、鼓包以及坑槽典型病害,开发了一整套桥面铺装快速无损检测技术。通过长期工程应用形成了一套高渗透树脂灌缝技术、高性能树脂材料鼓包注浆技术以及快固型冷拌树脂坑槽修补技术。从实际应用与跟踪观测的结果来看,修补使用2年后,裂缝没有出现二次开裂.注浆后鼓包的强度恢复到原来强度的80%左右,坑槽修补后使用状况良好。     

浅析欧美日汽车市场准入管理制度

从汽车法规体系、认证流程等方面,分别阐述了欧美日汽车产品市场准入制度,比较分析了欧美日三大车辆型式认证制度,并简要介绍了欧美日车辆认证制度及相关技术法规最新进展,希望能对我国汽车企业快速了解欧美日汽车产品准入制度,破除发达国家技术壁垒,尽快进入欧美日汽车市场有所帮助。     

美海军舰艇作战系统发展趋势分析

简要介绍了美海军驱逐舰作战系统、航母作战系统,分析了其结构、功能等特点,并初步探讨了美海军舰艇作战系统的发展趋势.     

Overlay Share Mesh for Interactive Group Communication with High Dynamic

An overlay share mesh infrastructure is presented for high dynamic group communication systems, such as distributed interactive simulation (DIS) and distributed virtual environments (DVE). Overlay share mesh infrastructure can own better adapting ability for high dynamic group than tradition multi-tree multicast infrastructure by sharing links among different groups. The mechanism of overlay share mesh based on area of interest (AOI) was discussed in detail in this paper. A large number of simulation experiments were done and the performance of mesh infrastructure was studied. Experiments results proved that overlay mesh infrastructure owns better adaptability than traditional multi-tree infrastructure for high dynamic group communication systems.     

An Adaptive Scheme for Neighbor Discovery in Mobile Ad Hoc Networks

The neighbor knowledge in mobile ad hoc networks is important information. However, the accuracy of neighbor knowledge is paid in terms of energy consumption. In traditional schemes for neighbor discovery, a mobile node uses fixed period to send HELLO messages to notify its existence. An adaptive scheme was proposed. The objective is that when mobile nodes are distributed sparsely or move slowly, fewer HELLO messages are needed to achieve reasonable accuracy, while in a mutable network where nodes are dense or move quickly, they can adaptively send more HELLO messages to ensure the accuracy. Simulation results show that the adaptive scheme achieves the objective and performs effectively.     

Improved Real-Coded Genetic Algorithm Solution for Unit Commitment Problem Considering Energy Saving and Emission Reduction Demands

Unit commitment(UC), as a typical optimization problem in electric power system, faces new challenges as energy saving and emission reduction get more and more important in the way to a more environmentally friendly society. To meet these challenges, we propose a UC model considering energy saving and emission reduction. By using real-number coding method, swap-window and hill-climbing operators, we present an improved real-coded genetic algorithm(IRGA) for UC. Compared with other algorithms approach to the proposed UC problem, the IRGA solution shows an improvement in effectiveness and computational time.     

无纤维SMA的性能研究与应用

通过机理分析,优化合成级配,论证无纤维SMA的可行性。研究表明,相比传统SMA,无纤维SMA需要更细的合成级配。在降低20℃的拌合温度下,后者的高温性能降低了4%,低温性能提高了5%,水稳定性能提高了2%。同时,工后数据显示,无纤维SMA的压实效果更优,抗滑性能更好,密水性略有降低。成本上,无纤维SMA可节省约30元/t的生产成本,但过程控制要求更精细。