萘系磺酸甲醛缩合物的性质

本文讨论了分散剂的性质及其作用机理。分离了用作分散剂的萘磺酸甲醛缩合 物（ＮＡＮＳＦ），甲基萘磺酸甲醛缩合物（ＮＡＭＮＳＦ）的单一组分，测定了各组分水 溶液的表面张力，其降低表面张力的能力随分子量的增加而递减；ＮＡＮＳＦ和ＡＢＳ或 ＯＰ配，可使表面张力从６９ｍＮ／ｍ左右下降到４０ｍＮ／ｍ左右；也显著改善了对染料 的润湿能力，可使接触角从５８°下降到１２°左右；测定了ＮＡＮＳＦ各组分在活性炭和 ＴｉＯ２上的吸附，均属朗格缪吸附，推测ＮＡＮＳＦ分子在ＴｉＯ２上的吸附形态为平躺的 单分子吸附层；在活性炭上的吸附量随ＮＡＮＳＦ组分的分子量增加而递减，在ＴｉＯ２上则 随分子量的增加而递增。     

社会心理因素与冠心病——一、性格与冠心病发病关系的研究

社会心理因素,如情绪或行为对疾病的发生发展,日益为医学界所重视。这一领域我国起步较晚,作者以高级知识分子为对象,用1:1配对的病例对照法,调查研究了 A 型性格与冠心病的关系。符合配对要求者共计106对,高级职称者占63.21%其余为讲师或相当于讲师的技术或医护人员。冠心组和对照组 A 型性格问卷所获总分分别为29.83±8.15和25.88±6.01分,差别非常显著(P<0.01)。冠心组中 A 型性格者所占比例为68.87%,比对照组(42.45%)高,配对卡方检验,P<0.01,比值比(OR)3.5,说明 A 型性格与冠心病有关系。两组 A 型性格者血清胆固醇和甘油三酯的浓度均显著高于 B 型性格者。     

β-环糊精与钨酸钠或钼酸钠的包结物

本文报道β-环糊精(β-CD)与钨酸钠或钼酸钠包结物的制备以及组成的测定。用DSC热分析和X射线粉末衍射分析法证实了包结物的形成。讨论了β-CD对钨酸钠或钼酸钠的包结能力。     

基于Tcl/Tk语言开发教育机器人系统

针对微型教育机器人的开发过程 ,详细分析了开放式Tcl/Tk软件特点 ,构建了教育机器人的系统结构 ,开发了基于Tcl/Tk的教育机器人系统软件平台 .该机器人软件系统具有紧凑、易于移植、用户友好的明显优点 .     

An estimation of ozone flux in a stratosphere-troposphere exchange event

A new method based on mass fluxes and observed ozone profiles was developed to estimate crosstropopause ozone flux. Using this method, we estimated the cross-tropopause ozone flux in a stratospheric-tropospheric exchange event that occurred over East Asia in March 2001.The result revealed that the ozone flux across the tropopause in this event was an order of magnitude higher than the global and hemispheric average. Compared to the traditional method using a linear relationship between ozone mixing ratio and potential vorticity near the tropopause, the cross-tropopause ozone flux evaluated with ozonesonde data was somewhat higher, although the orders of the two values were the same.     

直流伺服系统滑模变结构-神经网络控制的研究

针对直流伺服系统特点，根据现代控制理论，提出了滑模控制—神经网络策略，理论研究和实验表明，系统有较好鲁棒性和动静态特性。     

高精度溶解度实验系统的研制与验证

研制了一套高精度制冷工质溶解度实验系统,由自行开发的测控软件进行计算机实时测控.实验系统包括高精度温度测量系统(在253.15~363.15 K范围内,测量的不确定度小于±14mK),高精度压力测量系统(在0~3.5 MPa范围内,测量的不确定度小于±1.6 kPa),高精度恒温水浴(293.15~363.15 K),高精度恒温酒精浴(253.15~293.15 K),真空及配气系统等.对283.15~348.15 K温度范围内HFC-134a的饱和蒸气压进行了测量,并与标准值进行了比较,测量的平均偏差为0.54%.用此装置对制冷剂R22在吸收剂N,N-二甲基甲酰胺中的溶解度进行了实验研究,并同文献提供的数据进行对比,结果表明该实验系统具有较高的精度.     

Microstructure and properties of Si-TaSi2 eutectic in situ composite for field emission

The Si-TaSi2 eutectic in situ composite for field emission is prepared by electron beam floating zone melting (EBFZM) technique on the basis of Czochralski (CZ) crystal growth technique. The directional solidification microstructure and the field emission properties of the Si-TaSi2 eutectic in situ composite prepared by two kinds of crystal growth techniques have been systematically tested and compared. Researches demonstrated that the solidification microstructure of EBFZM can be fined obviously be-cause of the relatively high solidification rate and very high temperature gradient, i.e. both the diameter and inter-rod spacing of the TaSi2 fibers prepared by EBFZM technique were decreased, and the density and the volume fraction of the TaSi2 fibers prepared by EBFZM technique were increased in comparison with that of the TaSi2 fibers prepared by CZ method. Therefore the field emission property of the Si-TaSi2 eutectic in situ composite prepared by EBFZM can be improved greatly, which exhibits better field emission uniformity and straighter F-N curve.     

自蔓延溶胶凝胶法制备纳米氧化镁

以硝酸镁为原料，柠檬酸为络合剂，采用自蔓延溶胶凝胶法制备纳米氧化镁.利用红外光谱分析了干凝胶的结构.将该法制得的柠檬酸镁与溶胶凝胶法制得的前驱体的TG曲线进行比较研究，证明了自蔓延燃烧的发生，而硝酸根在自蔓延燃烧中作为氧化剂.对样品进行TEM测试，发现有自蔓延燃烧过程的产物颗粒小、分布均匀和晶粒形状明显.XRD测试结果显示其平均粒径为8.9 nm， BET测定比表面为26.34 m²/g.该文还讨论了发泡过程抑制粉体团聚的机理.     

Diagnostic analysis of mesoscale rainstorms in the Jiang-Huai valley of China with convective vorticity vector

By the vector product of absolute vorticity vectors and equivalent potential temperature gradients, a new vector, convective vorticity vector (CVV) is readdressed after Gao et al., and is applied to the study of the development and movement of mesoscale rainstorms in the Jiang-Huai valley of China by using high-resolution simulation data with PSU/NCAR MM5 briefly. The results show that the CVV, especially its vertical component which is closely related to interactions between vertical secondary circulations and horizontal equivalent potential temperature gradients, may be a good tracer and diagnostic tool in the study of mesoscale rainstorms in the Jiang-Huai valley of China. And the main physical processes responsible for the variations of the vertical component of the CVV are discussed briefly based on its tendency equation proposed in this article.