热处理对CuAlNiMnTi形状记忆合金相变滞后的影响

用电阻法、金相分析、电镜分析及Ｘ射线衍射等研究了热处理对ＣｕＡｌ－ＮｉＭｎＴｉ形状记忆合金相变滞后（Ａｆ—Ｍｓ）的影响．研究结果表明：淬火合金时效处理时，相变点急剧下降，时效初期相变滞后明显增大，后趋于稳定．淬火合金６００℃中温处理时，相变点下降，相变量减小．而热弹性马氏体相变类型则从Ｉ型转变到Ⅱ型，然后再转变到Ｉ型；伴随着热弹性马氏体相变类型的变化，相变滞后开始降低，然后增加．这是因为时效处理时析出ＮｉＡｌ基相，中温处理时析出ａ相所致．     

爱因斯坦模型的一些问题的讨论及修正

主要讨论了固体原子间相互作用的非线性项对爱因斯坦固体比热容的影响,通过数学运算得出了爱因斯坦固体比热的修正项,大大提高了理论值与实验值的接近程度;同时改进了爱因斯坦固体比热公式中温度的适用范围。     

宝塔罩型塔板的研究

宝塔罩型塔板是在新型垂直筛板(New VST)的基础上,提出的一种具有结构简单、生产能力大、工作范围宽、压降低和传质效率高的塔板。本文详述了该塔板的结构,以及流体力学性能和传质性能的实验结果。     

聚乙二醇催化合成α-丁基苯乙腈

苯乙腈在氢氧化钠、1-溴丁烷及相转移催化剂聚乙二醇作用下可顺利地发生α-丁基化反应,不同分子量的聚乙二醇具有不同的催化效力,溶剂、温度及催化剂用量对本反应均有重要影响.     

Protein aggregation as primary and characteristic cell reaction to various stresses

Ehrlich carcinoma and EL-4 thymoma ascites cells were subjected in vitro to heat shock, ATP depletion, oxidative stress, Ca²⁺ overlading and iodoacetamide treatment. After the transient stresses, Triton (X-100)-insoluble TIS) fractions were isolated from the cells and analysed by electrophoresis and immunoblotting. All stresses used caused rapid aggregation of cell proteins. This was manifested in a signficant rise in protein content in the TIS fractions. The protein increase was mostly due to and increase in the insolubility of actin, 57 kDa protein of intermediate filaments, 70 kDa heat shock protein (HSP 70), and some specific proteins whose insolubilization was a characteristic sign for each type of cell injury. Different survival rates in the cell lines after either stress corrlated well with differences in their TIS protein accretion. Possible mechanisms for stress-induced protein aggregation and its relationship with cell viability are suggested.     

近地面层湍流通量间接计算方法的比较

本文应用空气动力学方法和近地面层Ｍｏｎｉｎ－Ｏｂｕｋｈｏｖ稳定度参数ζ＝Ｚ／Ｌ相似方程的分析解，采用实梯度资料，代替数值迭代逼近法计算了感热和潜热通量，比较了目前空气动力学方法中广泛应用的Ｂｕｓｉｎｇｅｒ（１９７１）＾［１］，Ｄｙｅｒ（１９７０＾［２］和Ｐｒｕｉｔｔ（１９７３）＾［３］通量廓线关系通用函数在近地面层间接计算感热和潜热通量时的差别。另外，还分别与波文比方法的计算结果进行了比较。文中还     

AN ANALYSIS OF DYNAMIC PERFORMANCE OF BACK REST OF WEAVING MACHINERG

Periodic variations of warp tension during a weaving cycle results in corresponding variationsof back rest position.However,the oscillation of back rest,in turn,shows effect on the variation ofdynamic warp tension.As a force transfer medium,warp yarn,with specific dynamic performances,is certainly one of the factors influencing the movement of back rest.In this paper,warp yarn istreated as a viscoelastic medium in studying the dynamic behaviours of back rest.A mathematicalmodel of a back rest system is developed based on the automatic control theory.Several factors arelisted,which show influences on the performances of the back rest system.Analytical work is car-ried out to identify the effects on the frequency response of the back rest systen resulting from vari-ations of such parameters as the modulus of elasticity,of both fast-elastic and slow-elasticdeformations,and viscosity coefficient.     

低沸点工质水平蒸发换热强化管评述

本文分析总结了许多低沸点工质水平蒸发换热强化管的实验和理论研究成果,得到如下结论:在通常情况下,螺旋微翅片管的强化换热为最佳,其强化效果好、压力损失小;较优的翅片形状为锯齿形或翅顶为平形、翅槽为圆形;较佳的结构几何尺寸范围为:螺旋角β为10～25°、翅高h为0.15～0.20 mm、翅片数n为60～70.据此,作者提出了进一步深化研究的设想.     

锌离子的液膜渗透反应-扩散模型

建立了液膜萃取锌离子的数学模型。该模型考虑了液膜内水相及外水相的传质,油-水界面上萃取和反萃的络合反应速率以及液膜的破碎率。实验表明,在传质前期,本模型和渐进前沿模型都能较好地描述实际过程;在传质后期,本模型比渐进前沿模型更符合实验结果。