NdLMA激光器的附加脉冲锁模

用半导体激光泵浦ＮｄＬＭＡ激光器在１．０５４μｍ波长处获得连续６５０ｍＷ的激光输出，斜效率达３３％。利用一个包含光纤的非线性外腔，实现了自启动的ＮｄＬＭＡ附加脉冲锁模，输出平均功率为５８ｍＷ的接近带宽转移极限的１．８ｐｓ超短脉冲激光     

Synthesis and characterization of ethoxy‐terminated ladder‐like polymethylsilsesquioxane oligomer

A fully ethoxy‐terminated ladder‐like polymethylsilsesquioxane oligomer (EtO‐Me‐T) has been synthesized and characterized for the first time using an effective transient catalyst (tetramethylammonium hydroxide, TMAH) via the dehydration alcoholysis reaction of hydroxy‐terminated ladder‐like polymethylsilsesquioxane (HO‐Me‐T) prepared by a modified stepwise coupling polymerization approach. Compared with the common acidic or basic catalysts, use of the transient catalyst TMAH can not only make the HO‐Me‐T molecules fully ethoxy‐terminated but also enables the catalyst to be readily and thoroughly removed after completion of the alcoholysis reaction. It is noteworthy that the common acidic or basic catalysts widely used in the dehydration alcoholysis reaction are clearly unsuitable for the preparation of EtO‐Me‐T oligomer because the latter would be hydrolyzed unavoidably back to the parent HO‐Me‐T during the washing process. In addition, preliminary exploration indicates that, when compared with the tetraethyl orthosilicate (Si(OEt)₄) generally used as a crosslinking agent for the room‐temperature vulcanization of silicone rubber (RTV‐SR), the oligomer EtO‐Me‐T is a promising replacement which can greatly improve the mechanical properties of RTV‐SR Copyright © 2003 Society of Chemical Industry     

Missing the mark: Effects of time and causal attributions on goal revision in response to goal-performance discrepancies.

In an attempt to extend past goal setting research, the present study examined the influence of goal-performance discrepancies (GPDs), causal attributions, and temporal factors on the process of dynamic self-regulation. Goal revision processes were examined longitudinally in a sample of 100 varsity-level college track and field athletes over the course of an 8-week competitive season. The results indicate that an individual's GPD significantly predicted the amount of goal revision engaged in by the athletes, such that participants were more likely to lower their competition (proximal) and season (distal) goals when they failed to reach these goals and their respective GPDs were large. However, as hypothesized, this relationship was moderated by stability attributions and the temporal location of the individual with respect to the time period allotted for goal attainment. Implications for future research in the area of goal setting and dynamic self-regulation are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

低功率泵浦三镜腔结构的Cr:LiSAF激光器各种运转特性的研究

报道了采用三镜腔结构的Cr:LiSAF激光器在低功率的氩离子单谱线激光泵浦下,连续光、自调Q、自锁模和自调Q-自锁模的运转特性。当泵浦功率为860 mW时,在腔内不加任何调制器和可饱和吸收体,可实现自锁模运转,得到重复频率为150 MHz,脉冲宽度为51 fs,输出功率为48 mW的脉冲序列。     

Practice Variability and Transfer of Training: The Role of Self-Efficacy Generality.

Practice variability has been shown to enhance transfer of training. The purpose of the present study was to examine the role of self-efficacy generality as a motivational mechanism in explaining the relationship between practice variability and transfer. Undergraduate students (N = 82) were randomly assigned to 1 of 2 training conditions (constant or variable) for a computer decision-making task. Measures of self-efficacy (intensity and generality) and transfer (near and far) were assessed. The results provided support for some of the hypothesized relationships. Specifically, practice variability led to increased self-efficacy generality. Both self-efficacy intensity and generality influenced far transfer performance, although only self-efficacy generality served as a mediator between practice variability and far transfer. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

一种新的短帧交织器设计

分析了交织器的自交织距离与互交织距离对译码性能的影响,建立了交织距离的目标函数,提出了交织器优化设计的设计准则。在此基础上,给出了一种线性迭代的交织器设计方法,仿真结果表明该交织器具有优良的性能。     

自焙电极在大型钛渣电炉冶炼中的运用

对自焙电极在大型钛渣电炉中的运用进行了讨论，介绍了电极糊的组成、自焙电极的焙烧、电极壳结构，以及自焙电极与石墨电极进行比较和自焙电极的硬断和软断及处理办法。     

油气检测中的自组织映射分析

储层分析中的自组织映射分析是通过直接分析未知数据体来进行的，特别在勘探早期，可用于储层预测约束的井位很少，借助于原数据体中存在的聚类关系，可大大提高钻井的成功率。     

汽轮机汽封系统设计研究

介绍3种汽封系统的设计原理，论述了各系统的优缺点，对老机组改造及新机组设计有很高的参考价值。     

纳米TiO2薄膜制备技术研究进展

对纳米TiO2薄膜的各种制备技术，包括基于溶胶一凝胶的涂层技术、电沉积、化学气相沉积、物理气相沉积、自组装制膜等技术的研究进展进行了综述。并对纳米TiO2薄膜制备的研究方向提出建议。