Segmented polymer networks containing amino‐dendrimers

Polymer networks in which poly(propylene imine) dendrimers (Astramol?) are connected to each other by linear polytetrahydrofuran (polyTHF) segments, were prepared by two methods. The first method was a one‐step procedure in which bifunctionally living polyTHF, obtained by initiation of the THF polymerization with trifluoromethane sulfonic anhydride (triflic anhydride), was reacted with an amino‐dendrimer. This reaction was very fast but did not allow formation of the end products. The second method was a two‐step procedure. In a first step, living polyTHF, prepared with acryloyloxybutyl triflate as initiator, was grafted on an amino‐dendrimer, to form a star‐like, acrylate‐terminated polyTHF multi‐macromonomer with the dendrimer as core. In a second step, networks were obtained by Michael addition between the acrylate end‐groups and unreacted amino‐groups of the dendrimer. This cross‐linking reaction occurred spontaneously upon heating of the solution of the multi‐macromonomer with gelation times varying from a few minutes to a few hours, depending on the temperature and the composition of the prepolymers. With this method it was possible to prepare networks in the form of coatings or films. © 2003 Society of Chemical Industry     

井下煤仓全深度分段爆破成井技术

介绍了在煤矿现有设备条件下，全深度一次钻孔分段爆破掘进煤仓的设计与应用情况，论述了爆破方案确定，参数设计及主要措施，通过实践取得了良好效果。     

MOCVD生长薄膜材料制作半导体可饱和吸收镜

介绍了当前国际上流行的用半导体可饱和吸收镜来对固体激光器、光纤激光器和半导体激光器进行被动锁模的方法,阐述了半导体可饱和吸收镜用来作为被动锁模吸收体的原理,并介绍了如何利用金属有机气相淀积(MOCVD)技术生长各种波长激光器所需要的半导体可饱和吸收镜.     

美国高能激光技术2005年主要进展

高能激光武器技术在2005年取得了重大进展。介绍了机载兆瓦级化学氧碘激光器的关键试验和束控-火控系统的飞行试验。评论和讨论了高功率固体激光器、光纤激光器、超高效率二极管源和中继镜技术的重大进展。     

高功率DPL光束质量研究

为了在高功率DPL中获取高光束质量输出激光，利用扭转模获取高光束质量种籽源的同时，进行了高重复频率下的热致及光致双折射效应的补偿、高功率二极管均匀泵浦聚光腔设计及相位共轭镜用于改善激光系统光束质量等特性研究。最终获得了重复频率40Hz、单脉冲能量大于400mJ、近衍射极限的高光束质量激光输出。这种方法对高功率激光系统的设计十分有用。     

The mirror effect and mixture signal detection theory.

The mirror effect for word frequency refers to the finding that low-frequency words have higher hit rates and lower false alarm rates than high-frequency words. This result is typically interpreted in terms of conventional signal detection theory (SDT), in which case it indicates that the order of the underlying old item distributions mirrors the order of the new item distributions. However, when viewed in terms of a mixture version of SDT, the order of hits and false alarms does not necessarily imply the same order in the underlying distributions because of possible effects of mixing. A reversal in underlying distributions did not appear for fits of mixture SDT models to data from 4 experiments. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

RAID技术综述

通过对各种RAID级别的实现原理进行描述，综合分析了各种模式的性能、优缺点以及应用范围。     

CO2激光器线偏振光输出腔内起偏器的研究

混合InGaAs光电二极管阵列ETX128FPA是16384元InGaAs焦平面阵列,供1.0～1.7μm波段内的近红外成象使用。这种128×128元的二维光电二极管阵列是使用钢冲击结合技术把InGaAs材料结合到高级的CMOS倍增管上而制成的。     

被动锁模复合环形腔掺饵光纤激光器的自启动分析

本文对被动锁模复合环形腔掺饵光纤激光器的自启动工作特性进行了分析，指出谐振腔内残余反射面的存在是阻碍激光器实现自启动锁模的主要原因。利用半导体激光器有源区的折射率随注入电流的变化而改变的特性，在谐振腔中获得了一个可移动腔镜，克服了腔内残余反射面的影响，实现了锁模的自启动。     

动态全息图快速引入背景条纹技术

音叉振动镜快速引入背景条纹的动态全息图两次曝光法，适用于一次泵浦的双脉冲全息干涉计量术．其背景条纹的密度和方向具有可调性和重复性．