始为江山静

正夏花的当家花旦非荷花莫属。还是最喜欢荷花,最是清意萦怀,最是婷婷玉立,最是卷舒开合任天真,看着看着就青山翠微、风烟俱净。每年夏天不看荷花,再好的夏天都感觉不那么丰美。七月过半,野外看到一处荷塘,显然是特意新建的人工景致。虽然荷花正红着白着,莲蓬正青着,莲叶正绿着,但花朵、莲蓬都显得娇小,莲叶也没那么清阔到无穷碧,但荷花就是荷花,一身清正又娇娆自好地美在那里,美到不自知才是完美。     

反渗透海水淡化系统设备集成设计研究

本文主要阐述反渗透海水淡化系统设备的集成设计研究,以巴基斯坦某海水淡化系统项目为例,从工艺与结构两个方面叙述海水淡化系统设备集成的设计。     

基于HMIPv6的寻呼扩展策略

本文首先对移动IPv6 (MIPv6 )和分级移动IPv6 (HMIPv6 )中的通信过程和各个功能实体进行了简单的介绍。然后在HMIPv6的基础上提出一种寻呼扩展结构 (PagingExtensiononHMIPv6 ) ,包括加入此寻呼扩展后的网络体系结构和各个功能实体的描述并定义了其中几个重要的报文结构。通过加入该寻呼扩展使MIPv6实现注册本地化的同时支持IPPagingSupport,提供更好的可扩展性。     

铌镁酸铅-钛酸铅薄膜的钙钛矿结构及介电特性

为了提高铌镁酸铅-钛酸铅(Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3,PMN-PT)薄膜的铁电特性,采用单一醇盐溶胶-凝胶法制备了PMN-PT薄膜,分析了铌镁酸铅-钛酸铅薄膜的钙钛矿结构纯度及介电特性.结果表明:PMN-PT薄膜具有(100)择优取向,钙钛矿结构纯度达到97.7%,晶粒尺寸为95~105 nm;室温下,其相对介电常数达到1 135,介电损耗低于4%,弥散相变温度为85~120℃.     

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 文章介绍了在原有测角仪上设计安装了新的步进马达驱动装置和相应的控制接口以及对其进行控制的软件系统，实现了由计算机实时控制的数据采集和数据处理系统，经改造后的测角仪可用于常规X射线联机检测和分析，扩展了设备的功能，提高了分析效率。此外，经过对测角仪织构测角台的改进，实现了极图数据同心圆方式收集的功能。相应的软件控制系统完成对测角仪和织构测角台的控制，实现了极图自动测量功能。     

Resource allocation for cognitive WLAN over fiber

In this paper,a novel WLAN system,Cognitive WLAN over Fiber (CWLANoF),is introduced in the first place.Moreover,when CWLANoF has more channels than STAs,a new channel allocation scheme is proposed using the Hungarian algorithm,which is demonstrated to be the optimal one.Furthermore,when CWLANoF has fewer channels than STAs,it is possible for more than one STA to share the same channel simultaneously based on the new features of CWLANoF.And the power control scheme is proposed for this kind of sharing,considering efficiency and fairness.Finally,extensive simulation results illustrate the significant performance improvement of the proposed channel allocation scheme and power control scheme.     

Optimal power allocation for a video layered multicasting relay strategy in cellular system

Within a cell of cellular system,cooperative relay technique can improve the performance of multicast efficiently,but it can cause the stream frequent interruptions because of the mobility of relay terminals.A video layered cooperative relay strategy is proposed to guarantee the continuity of multicast stream and retain high-bandwidth of the cooperative relay channel.Based on the capacity analysis for layered relay channel in the strategy,the optimal power allocation is studied to maximize capacity.After analyzing and optimizing the capacity in abstract models,the study is extended to a non-fading and a Gaussian wireless channel model to satisfy the scenario of cellular system.Giving the relay nodes position or distribution of noise power,the obtained results can determine the optimal power allocation among the transmitter and relay nodes.At last,the simulation results show that the strategy and its optimal power allocation have a significant improvement on the performance.     

居住小区规划设计创新的关键问题解析

随着社会经济的不断发展,人民生活水平和对生活品质的要求不断提高,对生活居住小区的建设要求度也随之提升。居民对于居住需求已由原来的基本生理需求上升到了心里需求及文化需求层次。本文针对现阶段国内居住小区的现有问题及创新关键措施进行浅析,提出一些对于居住小区规划设计创新的看法。     

渗稀土激光熔凝处理对纯铁表面耐磨性的影响

研究了渗稀土激光熔凝复合处理对纯铁表面耐磨性能及微观组织的影响。结果表明，经过复合处理，纯铁表面的耐磨性显著提高，磨损失重为未处理试样的5%，且纯铁表层微观组织改善，晶粒细化，组织均匀致密，渗入元素浓度梯度明显减小。