分裂型超细纤维水刺非织造布力学性能研究

对分裂型短纤水刺非织造布与分裂型长丝纺粘水刺非织造布在受外界机械力作用后的拉伸断裂强力和胀破性能的变化进行了研究。结果表明:在外界机械力作用下,分裂型超细纤维水刺非织造布中的纤维会进一步开纤,在改善其开纤情况的同时,各项力学性能变化不大;机洗是一种效果好、无污染的新型开纤方法。     

带磁力耦合装置的压缩机隔离罩碎裂原因分析

对带磁力耦合装置的压缩机结构和系统进行了分析,采取增加缓冲容器等方法,平衡压缩机停机时气缸和管路中的高压气体,有效解决了压缩机在使用过程中隔离罩碎裂的问题。     

高强混凝土SHPB试验的数值模拟研究

利用大型有限元分析软件LS-DYNA对高强混凝土的SHPB冲击压缩过程进行了数值模拟,再现了高强混凝土试件在冲击压缩试验过程中的破坏过程,得到了不同应变率下的应力-应变曲线。模拟研究还发现:试件内部应力波经过多次来回反射后趋于稳定,较好的符合均匀性假定。混凝土试件从边界处的开裂破坏逐渐发展到内部的压碎破坏。     

一种新颖的双陷波超宽带天线设计

针对超宽带系统易受窄带信号干扰的问题,设计了一种新颖的基于金属开口谐振环结构的双陷波平面超宽带天线。通过在天线的辐射贴片上加载U形槽和在接地板上引入寄生条带的方法实现了双陷波特性。利用仿真软件研究了U形槽和寄生条带的物理尺寸对陷波特性的影响,并对所设计的超宽带天线进行了制作和测量。仿真和测试结果表明,天线在超宽带系统3.1～10.6GHz工作频段内的电压驻波比小于2,在WiMAX和WLAN频率范围具有良好的陷波特性,有效地抑制了超宽带通信系统与窄带通信系统之间潜在的干扰。     

Splitting downlink multimedia traffic over WiMAX and WiFi heterogeneous links based on airtime‐balance

We investigate the challenge of splitting a traffic flow over WiMAX and WiFi links. For traffic load distribution over heterogeneous RATs (Radio Access Technologies), heterogeneous link resources need to be commonly measured and fairly compared. To this end, an airtime cost model is considered as a common resource measure. The model can be used to estimate channel time consumed for a successful packet transmission. As a traffic split mechanism, an airtime‐balance method is proposed. Using the airtime cost model, the offered traffic load (in Mbps) is converted into airtime cost required for its transmission, and IP packets are distributed to multiple RATs so that airtime is equally balanced between RATs. We have implemented a practical test‐bed system, including both WiMAX and WiFi systems, and used it to conduct extensive experiments indoor and outdoor. Experimental results confirm that airtime‐balance can achieve an improved flow split to reduce the waiting packets at the reorder buffer of the receiver. Moreover, it could realize a more rapid adaptation to link variations with local measurements, when compared to the RTT‐based method, which also requires extra system overhead due to the use of probe packets. Copyright © 2010 John Wiley & Sons, Ltd.     

谈竹胶板拼装定型大模板施工技术

以秦皇岛同和热电厂粉煤灰仓工程为例,结合自身工作实践,介绍了竹胶板拼装定型大模板施工技术,分别阐述了模板配制、安装、加固校正及表面处理等关键工序施工要点,并指出应注意的问题及竹胶板拼装大模板的优点,具有一定指导意义。     

横机生产针织手套

带有5个手指的针织手套通常在具有高产量及特殊工艺技术的、专门的电子横机(如日本岛精)上生产。但有时生产订单可能只是把手套作为针织服装的附件,而不是把它本身作为一种产品。在这种情况下,在普通横机上生产手套可能是对生产者的一种挑战。介绍了一种基于分离技术的在普通双针床电子横机(德国Stoll公司的CMS300TCE7横机)上生产手套的技术解决方法。     

遥测文件截取器软件设计与实现

为解决大容量遥测数据文件的快速分割,软件针对遥测文件以帧为基本单位且每帧头都含有时码的特点,设计按特征参数截取、按时间截取以及按帧序数截取等三种方法以满足不同的截取要求。遥测参数的解算调用已成熟的动态链接库,对于一些耗时的运算使用了二分搜索等优化算法。该软件操作方便、截取效率高,在型号应用中发挥了重要作用。     

Session integration service over multiple devices

One of the most important research subjects in session initiation protocol (SIP) is mobility management. Session mobility is a key issue in SIP mobility management. Session mobility is an advanced feature that maintains an ongoing media session from one device to another. In this paper, we consider the issue of session mobility and propose a complete integrated solution, referred to as ‘session integration service’, to transfer an ongoing media session over multiple devices. To provide flexibility in session mobility, three new agent states are introduced based on the user agent definition. They consist of session manager, session user, and free node. This paper also proposes two split session integration methods for session integration service based on these three agents. The proposed method provides session mobility flexibility and allows the user the ability to transfer, split, and retrieve a session over multiple devices. Moreover, the split session can be integrated in any devices. To ensure session mobility over multiple devices, the session integration service will be implemented through a modification of the open source project ‘SIP‐communicator’. Copyright © 2010 John Wiley & Sons, Ltd.     

功率分流式无级变速器电控系统设计

针对功率分流式无级变速器的传动方案及工作原理,完成了总体方案设计,文中根据总体方案对电控系统的功能要求,设计了一种基于ARM微处理器的电控系统,来实现无级变速控制。通过软硬件的仿真调试,验证了所设计的电控系统能满足无级变速器的功能要求。