变频控制直接膨胀式太阳能热泵的数值模拟

文中通过对变频控制直接膨胀式太阳能热泵的数值模拟,指出PV/T- SAHP系统实现变频控制从而解决太阳能热泵集热器面积与压缩机的容量不匹配的关键问题是找到系统集热/蒸发器的MSS线.为变工况下太阳能热泵系统的研究提供参考.     

MTU和MSS问题研究

如果网络不丢包而网络时快时慢,或部分应用无法使用,很大程度上可以定位为MTU&MSS问题。文章从MTU和MSS原理分析了问题产生的原因,提出了解决问题的方法。     

On Stability and Trajectory Boundedness in Mean-square Sense for ARMA Processes

Abstract For the multidimensional ARMA system A(z)y_k=C(z)w_k it is shown that stability(det A(z)≠0,z:│z│≤1)of A(z) is equivalent to the trajectory boundedness in the mean square sense(MSS)which,as a rule,is a consequence of a successful stochastic adaptive control leading the closed-loop of an ARMAXsystem to a steady state ARMA system.In comparison with existing results the stability condition imposed onC(z)is no longer needed.The only structural requirement on the system is that det A(z) and det C(z) have nounstable common factor.     

亚、非洲移动卫星通信系统

本文讨论了几个正在发展中的亚洲、非洲移动卫星通信系统。     

Some combinatorial properties of words in discrete dynamical systems from antisymmetric cubic maps

In this paper, we study the combinatorial properties ol words m chscrete dynamical systems from antisymmetric cubic maps. We also discuss the relationship of primitive kneading sequences of length n and period-doubling kneading sequences of length 2n, and then determine the number of all kneading sequences of length n.     

Blue-hazard free candlelight-style tandem organic light-emitting diode

Long exposure to intensive blue light may damage retina and suppress, at night, melatonin secretion. To devise a blue hazard-free light source with a long lifetime, we demonstrated here a tandem organic light-emitting diode (OLED) with candlelight-style emission, especially via the use of all commercially-available materials. The resultant device shows a color temperature of 1500 K, significantly lower than the 1800 K of oil lamps, 1900 K of candles and 2500 K of incandescent bulbs. It permits, at 100 lx, a retinal exposure-limit of 12 h, while merely 5 min for the 6000 K cold-white LED or CFL. Notably, it is 15 times more human eye-friendly and 30 % more melatonin generation-friendly than the candle. It shows a lifetime of 40,000 h at 1000 cd per meter square, which is about 20,000 times that of a candle and 40 times that of an incandescent bulb. It is 65 times more energy-saving as comparing with candles. Commercially viable human-friendly lighting can be expected in the near future to safeguard human health.     

使用TD-HSDPA进行FTP下载断流问题分析

本文针对使用TD—HSDPA系统进行大容量文件FTP下载过程中出现的断流问题进行分析，通过对比测试和信令抓包等手段，定位到TCP协议ePMSS设置对断流现象产生的影响，通过修改Gi口防火墙的MSS设置解决了该问题，最后提出尚待跟进的几个问题。     

遵义电视台4频道数字硬盘播出系统

本文简要介绍了遵义电视台4频道数字硬盘播出系统设计，该系统以美国AVID MSS 8O00视频服务器为核心，采用国内硬盘播出领域占有量最高的北大方正无忧播控软件，配置被国内省级电视台广泛使用的周边设备，实现4个频道的播出。     

LEO移动卫星系统的一种基于动态多普勒的切换技术

切换技术是移动通信系统中的关键技术之一。对于LEO移动卫星通信系统而言,切换不光考虑小区之间、还得引入星际切换,因此,其复杂程度远远高于地面蜂窝系统。近几年来,随着LEO移动业务的蓬勃发展,众多的切换机制应运而生,并在实际应用中得到了检验和发展。介绍了一种基于动态多普勒的切换排序技术,对其原理及切换过程进行了详细的阐述。     

双栈环境下IP城域网MTU研究

通过研究城域网双栈环境下各类MTU处理机制的特点,对已有技术存在的不足和适用场景进行了分析,提出了现网部署时需关注的问题和现阶段建议方案,并对理想方案进行了探讨.