CTAB胶束溶液对正脂肪酸乙酯碱性水解反应的催化动力学行为研究

在20℃条件下，运用电导测定方法及非线性动力学模型进行数据处理，得到了在不同浓度十六烷基三甲基溴化胺(CTAB)胶束水溶液中正脂肪酸乙酯(甲酸乙酯，乙酸乙酯，丙酸乙酯，丁酸乙酯及正戊酸乙酯)碱性水解反应的速率常数．依据离子交换模型(PIE)理论讨论了在第一和第二临界胶束浓度(CMC)时，CTAB对正脂肪酸乙酯碱性水解反应速率的影响及规律性．     

秦始皇陵2,3号坑兵马俑原料来源和研制工程的初步分析

为探究秦始皇陵兵马俑的原料来源和烧制技术,选取63个秦始皇陵2,3号坑的兵马俑样品和20个秦陵附近的黏土样品,2个耀州瓷胎样品,进行中子活化分析(NAA),测定每个样品中32种微量元素的质量分数.将这批NAA数据进行模糊聚类分析,得到动态模糊聚类分析图.结果表明,2号坑和3号坑兵马俑原料来源不完全相同,但多数兵马俑样品与秦陵附近的垆土样品关系密切,其原料来源可能在秦陵附近,由此推断烧制2,3号坑兵马俑的窑址也可能在秦陵附近.还初步分析了2,3号坑兵马俑研制工程的历史背景和秦陵封土,2号坑夯土、回填土与附近黏土的关系.     

Effect of heat treatment on magnetostriction and order-disorder transition of Fe83Ga17

Effect of heat treatment on magnetostrictive properties and order-disorder transition of 〈110〉-oriented polycrystal Fe83Ga17 alloys is investigated. It is found that magnetostriction and order degree of Fe83Ga17 alloys are very sensitive to cooling rate. Variation of magnetostriction is discussed in terms of order-disorder transition. Under compressive stress of 20 Mpa, saturation strain λs of partially ordered Fe83Ga17 alloys quenched into water reaches 298×10-6.     

浙江朱家尖岛砾石海滩沉积物分布及形态特征

砾石海滩是波浪作用下形成的海岸地貌类型，在浙江朱家尖岛的大乌石塘和小乌石塘两处口袋状砾石滩，采集了砾石滩不同部位的沉积物样品．根据样品的粒度分析和颗粒形态分析，发现砾石滩沉积物粒度参数及砾石形态参数在横向和纵向上的分布特征为：横向上，砾石平均粒径由陆向海递减，分选变好，扁长度及杆状程度由砾石堤顶部向海递增，球度以潮间带为最低；纵向上，大乌石塘砾石粒径由湾顶向南北两个方向递减，分选变好，球度降低，杆状程度提高，而小乌石塘砾石粒径由海滩南部向北递减，分选先变好再变差，球度减小，扁长度及杆状程度提高．小乌石塘海滩顶部砾石对应的水深为5m、周期为10s临界起动轨迹流速和临界波高分别为3．28m／s和4．84m，大乌石塘的临界起动轨迹流速、临界波高分别为3．17m／s和4．69m．砾石形态参数和平均粒径的变率分析表明，小乌石塘在横向上的磨蚀作用的效应略强于搬运作用，而在纵向上却略弱于搬运作用；大乌石塘的海滩砾石主要发生磨蚀作用，在横向上的搬运作用非常微弱，而在纵向上其效应略弱于磨蚀作用。     

激光制导炸弹数字仿真研究

以激光制导航空炸弹为例，建立了该型炸弹的导引头模型、控制系统模型和六自由度空间运动模型。在MATLAB环境中，通过使用SIMULINK工具箱，对该型炸弹进行了数字仿真研究。仿真结果为后续的半实物仿真提供了基础。     

An improved form of the ELMS algorithm

1.INTRODUCTION Adaptiveechocancellersarewidelyemployedintele conferencingsystemsinordertocompensateforthe impairmentinthequalityduotoundesiredechoesre sultingfromcouplingbetweenloudspeakerandmicro phone.Inastereophonicenvironment,thefunda mentalproblemofechocancellationisthatgiventhe inputtotheloudspeakersandtheoutputofthemicro phonesinthereceivingroom,theechopathcannot bedetermineduniquely[3,8,9].Theproblemisdueto thecorrelationbetweenthestereosignals.Asare sult,anyadaptivetechniqueusedi…     

临终关怀:让每个临终病人尊严地走完一生

以人为本，以病人为中心，是医院为患者服务的宗旨。随着医院医德医风的建设．医护人员对濒临死亡病人的护理日益受到重视。让每个病人都能尊严无憾地走完自己的最后历程，是当今医院和社区医疗服务建设的重要内容之一。     

重名、异名、无名是中药方剂整理的首要难点

重名，即指同名异方；异名，指一方多名；无名，即没有正式方名。在大量的中药方剂中，重名、异名相当普遍：大量的方书中，还有大约百分之几到百分之九十左右不等的方剂无名。方剂整理和方剂名词审定都有困难，应该引起重视。     

下一代互联网中的智能QoS组播路由算法

设计了一种下一代互联网中的智能QoS组播路由算法,给定一个QoS组播请求和柔性QoS需求,包括带宽需求、组播端到端延迟区间,延迟抖动区间和出错率区间,寻找一棵QoS组播路由树.提出一种基于演化算法和单纯形算法的混合算法来构造满足上述需求且费用近优QoS柔性组播路由树,兼顾网络负载均衡.仿真结果表明,该算法是可行和有效的,明显优于基于传统遗传算法的QoS组播路由算法.     

Seasonal Variation and Land-Use/Land-Cover Type Impacts on the Correlation of Urban Heat Island Intensity and Difference Vegetation Index with Satellite Data in Xi’an,China

Green coverage has pronounced influences on urban heat island (UHI) effect, while the impacts of seasonal variation and Land-Use/Land-Cover (LULC) types on this effect has not been implemented. This paper investigated the spatio-seasonal characteristics of urban thermal environment and the vegetation-soil mixed area, and then explored the effects of vegetation status on UHI intensity from the perspectives of seasons and regions in Xi’an using four Landsat 8 images. UHI intensity index was implemented to extract UHI intensity based on thermal infrared imagery, and difference vegetation index (DVI) was used to represent vegetation-soil mixed area. Results indicated that DVI has impacts on UHI intensity, and their relations vary with season and region. In the whole Xi’an, if UHI intensity is smaller than -0.1, DVI increases with the increase of UHI intensity; whereas for UHI intensity is greater than -0.1, DVI decreases with increases of the UHI intensity from early spring to autumn. The highest correlation level was discovered in the autumn map (R²=0.713). Results of correlation analysis further displayed that DVI positively correlated with UHI intensity at impervious surface, and that the main urban area possessed the best correlation with R²=0.564 5.