折算频率对翼型动态升力特性影响的初步研究

本文根据在西北工业大学翼型研究中心（ＣＡＤＲ）进行的ＮＡＣＡ００１２翼型动态特性研究，着重介绍测力法研究中，滤波器截止频率和动态特性研究中最重要的相似准则折算频率影响的研究结果．结果表明，对动态特性研究而言，恰当的滤波器截止频率是获得正确结果的必要条件，在此基础上，通过改变折算频率，得出它对升力特性影响的可信结果．     

发动机被动液阻悬置动态特性比较研究

采用集总参数法和键合图法建立了惯性通道式、解耦盘惯性通道式以及节流盘解耦盘惯性通道式三种液阻悬置的动力学模型,建立了状态空间方程,获得了液阻悬置低频和高频的动态特性,对比分析认为惯性通道解耦盘式液阻悬置和节流盘解耦盘惯性通道式液阻悬置具有良好的频变幅变特性,而节流盘惯性通道解耦盘式液阻悬置拓宽了被动液阻悬置高频的使用频率,改善了惯性通道式和惯性通道解耦盘式被动液阻悬置高频的动态特性.     

Total synthesis of isoroquefortine E and phenylahistin

Isoroquefortine E and phenylahistin were synthesized using the Horner–Wadsworth–Emmons reaction as the key step to build the dehydroamino acid moiety. The syntheses provided the materials for the biological studies of the roquefortine–phenylahistin molecules.     

Biomacromolecular affinity: Interactions between lysozyme and regioselectively sulfated chitosan

It is well known that the sulfate groups on different positions in polysaccharides play important roles in protein adsorption. However, the interactions between sulfated chitosans and lysozyme have not been clearly elucidated. In this study, the regioselectively sulfated chitosans, 6-O-sulfated chitosan (C6S), 2-N-6-O-sulfated chitosan (C26S) and 3,6-O-sulfated chitosan (C36S), were chosen to investigate the possible mechanisms determining the interaction between lysozyme and the sulfated chitosans. It has been found that the selectively sulfated products of chitosan (CS), C6S, C26S and C36S all exhibit lysozyme binding activity. However, the maximum binding ratios of lysozyme/polysaccharide are significantly different for C6S, C26S and C36S. In addition, though C6S possesses the lowest sulfur content among the three sulfated chitosans, it exhibits the highest binding activity with lysozyme. Furthermore, in the protein mixtures, C6S shows the highest selective binding activity with lysozyme among the three sulfated chitosans in the presence of γ-globulin and bovine serum albumin (BSA). The results indicate that 6-O-sulfate groups may be responsible for the high affinity and specific interaction of sulfated chitosan with lysozyme, while 2-O-sulfate and 3-O-sulfate groups are unfavorable to this interaction.     

山西植被的水平地带性分析

本文从植被生态学角度,分析了各种生态因素与山西植被水平地带性之间的相互关系。分别论述了森林、灌丛和草本植物群落的水平分布规律。     

桑色素荧光分光光度法测定水和保健饮料中痕量锗

本文提出了测定水和保健饮料中痕量锗的桑色素荧光分光光度法。检出限分别为0.2μg/L和0.7μg/L,线性范围分别为1.0～25μg/L和5.0～30μg/L,平均回收率分别为97.2％～104.5％和98.8％～104.8％,相对标准偏差分别为3.66％。2.87％方法简便,准确高度,精密度好,共存离子干扰小。     

氧化铝基催化剂上二硫化碳水解反应性的研究

本文通过等体积浸渍法制备了三种氧化铝基催化剂，在实验室固定床上考察ＣＳ２浓度、空速和反应温度等因素对水解反应的影响。研究结果表明：Ｋ２Ｏ和Ｐｔ的负载都可以提高氧化铝上ＣＳ２的催化水解转化率，催化剂表面碱性是ＣＳ２水解反应活性中心在３０００ｈ＾－１和４０－１４０℃范围内，ＣＳ２在三种催化剂上反应活化能力为３５．３７－５５．５３ｋＪ／ｍｏｌ；通过二硫化碳催化水解反应类型的数学分析，进行实验值与计算值之     

基于事故记录的船撞桥墩概率模型建立

指出国内外既有船撞桥概率模型的不足之处．在事故记录基础上，根据不同性质航道特征和船舶行驶特点，分别提出狭窄河流、海峡／海湾和内河船撞桥墩概率模型，讨论了各参数取值的合理性，为设计人员认识船撞桥主要风险源和采取合理设计策略提供理论依据．     

中外优秀男子跳远运动员起跳技术运动学参数的比较研究

本文通过对２１名中外优秀男子跳远运动员起跳技术运动学参数的比较研究，勾画出世界优秀运动员起跳技术的主要特征，进而为更全面客观地评价起跳效果，进一步提高跳远运动水平开辟新的途径。