微乳中复凝聚法制备壳聚糖明胶纳米胶囊

以明胶和壳聚糖作为包裹材料,在O／W型微乳液模板中,用复凝聚的方法制备纳米胶囊,考察了影响合成纳米胶囊的主要因素,并进行了分析．结果表明,本实验采用的在微乳中复凝聚法合成了分散性好、粒度均匀、粒径200—400nm的球形纳米胶囊．制备了尼莫地平（NMP）纳米胶囊,得到包封率达到90％、粒径500～800nm的载药纳米胶囊．     

太极拳锻炼对少年儿童心理健康的影响

目的：探讨太极拳锻炼对少年儿童心理健康的促进作用．方法：抽取太极拳练习史在一年以上的少年儿童（12±2岁）为研究对象,应用《中国中学生心理健康量表》（MSSMHS）作为测量工具,做问卷调查并进行统计分析．结果：太极拳组与对照组相比,强迫、偏执、敌对、抑郁、焦虑五个因子有显著性差异（P〈0．05）,学习压力、人际关系紧张、适应不良、情绪不稳定、心理不平衡五个因子有非常显著性差异（P〈0．01）．结论：太极拳对改善少年儿童的不良心境,提高心理健康水平有良好的作用．     

Raman spectra of nitrogen-doped tetrahedral amorphous carbon from first principles

The non-resonant vibrational Raman spectra of nitrogen-doped tetrahedral amorphous carbon have been calculated from first principles, including the generation of a structural model, and the calculation of vibrational frequencies, vibrational eigenmodes and Raman coupling tensors. The calculated Raman spectra are in good agreement with the experimental results. The broad band at around 500 cm^-1 arises from mixed bonds. The T peak originates from the vibrations of sp^3 carbon and the G peak comes from the stretching vibrations of sp^2-type bonding of C=C and C=N. The simulation results indicate the direct contribution of N vibrations to Raman spectra.     

结构疲劳损伤理论的评述

结构疲劳是其在累积损伤、裂纹起始,扩展直至破坏的过程.通过对既有的各种结构累积损伤理论进行分析和对比,文章研究了目前存在的各种累积损伤理论适用性与优缺点,并从损伤力学角度研究了累积损伤的原理.     

校园网教学资源建设模型和资源共享的实现

阐述校园网教学资源的组成及分类,根据资源建设必要性和面临的问题提出校园网教学资源建设模型和有效地实现资源库之间的共享的方法.     

Term Structure Forecasting: No‐Arbitrage Restrictions versus Large Information Set

This paper addresses the issue of forecasting term structure. We provide a unified state‐space modeling framework that encompasses different existing discrete‐time yield curve models. Within such a framework we analyze the impact of two modeling choices, namely the imposition of no‐arbitrage restrictions and the size of the information set used to extract factors, on forecasting performance. Using US yield curve data, we find that both no‐arbitrage and large information sets help in forecasting but no model uniformly dominates the other. No‐arbitrage models are more useful at shorter horizons for shorter maturities. Large information sets are more useful at longer horizons and longer maturities. We also find evidence for a significant feedback from yield curve models to macroeconomic variables that could be exploited for macroeconomic forecasting. Copyright © 2010 John Wiley & Sons, Ltd.     

态势热点非线性评估方法研究

态势图中数据信息量过大,海量态势信息容易产生超过生理极限的巨大认知负载,这将导致指挥员感知、判断、决策的迟滞,严重时可以导致决策活动崩溃。为解决认知负载过重问题,需要对态势信息进行处理,以评估和突出态势热点。基于协同目标聚集因素,将态势目标造成有效影响的可能性以及目标之间的协同作为判别指标,推导出关注度函数,设计了态势热点值计算方法。通过示例仿真计算可见,本方法在时效性和准确程度水平上可以更好地评估态势热点的变化情况,降低指挥员的认知负载和认知偏差。     

HMX/黏结剂体系摩擦特性及抗过载性能

奥克托金(HMX)作为现今军事领域能量水平高、综合性能最好的单质炸药,具有优良的爆轰性能,被广泛应用于混合炸药中,但其摩擦、撞击感度都较高,也使其在应用过程中存在安全隐患。为了改善HMX基混合炸药的摩擦性能和抗过载性能,采用氟橡胶和顺丁橡胶包覆HMX颗粒,获得HMX/黏结剂混合体系样品,利用扫描电镜观察包覆前后HMX的形貌变化,通过滑移力测量仪与摩擦感度仪测试样品的摩擦性能,最后考核HMX基混合体系的抗过载能力。实验结果表明：氟橡胶和顺丁橡胶能够对HMX炸药颗粒有效钝感和减摩,其中顺丁橡胶包覆后的HMX基混合炸药体系摩擦特性更优良,且通过了抗过载实验考核。     

碎屑岩侧钻井泥岩防塌钻井液体系实验研究

针对塔河油田碎屑岩侧钻井在储层上覆泥岩盖层段坍塌掉块、井径扩大,造成封隔器坐封失效的问题,论文结合地层宏观特性及微观结构进行分析,明确了碎屑岩复杂泥岩段的井壁坍塌机理,提出了以抑制为核心的钻井液防塌体系对策,进而通过开展室内实验研究,形成了具有强抑制封堵、低失水和良好润滑携岩性能的钻井液体系。