Kinetics of styrene emulsion polymerization with a stable monomer radical

We have analyzed the electrical conductivity of a linear high charge density polyelectrolyte aqueous solution, finding that the counterion association order follows the same pattern as that described for a cyclic monomeric polyelectrolyte, i.e. NO > Br^? > Cl^? > F^?. However, these counterions interact in a very different manner with this polyion, making Eisenberg's relationship inapplicable in this system. Consequently, an alternative method is proposed for treating data.     

含钼低碳微合金化钢连续冷却过程相变动力学研究

在热模拟试验机上采用膨胀法并结合金相组织观察，测定了含钼和不含钼的试验钢贝氏体转变CCT曲线。研究了超低碳微合金化钢中钼元素对形变奥氏体连续冷却转变过程相变动力学的影响，结果表明，钢中加入ω（Mo）0．4％后，明显降低贝氏体的析出温度，并得到更细小的贝氏体组织；同时在相同的冷速条件下形成的M（马氏体）岛状组织也更加细小弥散；形变奥氏体在连续冷却过程中即使在冷速较低情况下也能获得细小的贝氏体组织。     

Model of Precipitation Kinetics Induced by Strain for Microalloyed Steels

In microalloyed steels, static recrystallisation is temporarily inhibited by precipitation which is occurring at the same time. A high number of microalloyed steels containing various combinations of carbon, nitrogen and precipitate forming elements like V, Nb and Ti were recrystallised at different temperatures and strain rates. From these results recrystallisation‐precipitation–time‐temperature (RPTT) diagrams were established. The influence of grain size and strain rate on the RPTT diagrams was studied. The precipitation kinetics were mathematically described for isothermal conditions and converted to cooling conditions, which enables an application to hot rolling. Under cooling conditions, completion of recrystallisation is prevented, especially for Nb alloyed steels.     

镧热还原氧化钐过程动力学控速环节的探索

讨论了镧热还原氧化钐过程的一般动力学过程，探讨了在制备金属钐温度下的动力学控速环节，分析了影响控速环节的因素，通过镧渣分析和配料优化实验，找出了提高反应速度的方法。     

压电式传感器测定蛋白质吸附动力学参数

利用液隔电极型压电式传感器实时监测牛血清白蛋白(BSA)在石英表面吸附过程。基于所提出的吸附动力学模型,估算出BSA在石英表面的吸附速率常数为ka=1.27×103mol-1·L·s-1,脱附速率常数为kd=1.31×10-3s-1,由可逆吸附态向不可逆吸附态的转化速率常数为kf=3.46×10-4s-1。     

乳状液型液膜法处理含锌废水的动力学

乳状液型液膜法以其去除效果好、回收率高、处理量大、消耗低等特点，在废水治理中得到了广泛的应用。本文采用该法对含锌废水进行处理，取得了较好的效果。在此基础上，通过对分离过程动力学的研究，确定了速控步骤的动力学方程，从理论上探讨了载体和废水中锌离子浓度，以及分离温度对分离速度和分离效率的影响，并在实验中得到了验证。该动力学方程的建立，不仅为含锌废水的处理提供了依据，也为计算机模拟该过程奠定了基础。     

锻件毛坯等温退火生产线的设计

等温退火是锻件毛坯获得均匀组织和硬度的热处理工艺,阐述了等温退火生产线的组成及主要结构特点,并详细阐述了该生产线的冷却控制系统。     

硫化铜精矿焙烧的非等温动力学研究

采用DTA，TG结合X-射线衍射分析，对硫化铜精矿的焙烧的动力学进行了研究．发现硫化铜精矿焙烧可以分成两个阶段．在第一个阶段(673～857K)，铜的硫化物被氧化成硫酸盐；在第三个阶段(857～1073K)，生成的硫酸盐将分解为氧化物．其两个阶段都受界面化学反应所控制，表观活化能分别为159．5kJ／mol和242．2H／mol．     

相变区等温处理对V-N钢轧后组织的影响

研究轧后等温处理工艺对微合金V—N钢γ→α相变组织的影响。对含氮量不同的两种低碳V钢进行了模拟轧制和控轧冷却，接着于650～700℃进行了等温处理，使发生γ-α相变。用光学显微镜和透射电子显微镜(TEM)观察和比较了钢中的显微组织转变特点。结果表明，随等温温度的降低及保温时间的延长，铁素体的转变量增加；增加钢中的氮含量，能明显促进轧后显微组织中铁素体的生成，有利于细化晶粒。     

Investigation of Structure and Hydriding Properties of La0.6 Nd0.4 Ni4.8 Mn0.2 Cux Alloys

The structure and hydriding performance of La0.6Nd0.4Ni4.8Mn0.2Cux (x = 0 ～ 0.4) alloys were investigated in order to develop suitable materials for metal hydride air conditioner. The effect of Cu addition on the crystal structure,equilibrium pressure, hydrogen capacity and hysteresis as well as hydrogen absorption/desorption kinetics were systematically studied by using the measurement of P-C isotherms, X-ray diffraction and scanning electron microscopy. As the amount of Cu increases, the plateau pressure increases and hydrogen absorption/desorption kinetics is improved, but the effective hydrogen storage capacity decreases. It is shown that variations in the basal plane parameter a can be used as an indication for the plateau pressure changes. With the increase of parameter a, the plateau pressure decreases. For La0.6 Nd0.4Ni4.8Mn0.2Cux(x = 0 ～ 0.4) alloys there is a relationship between the effective hydrogen storage capacities and the ratios of their unit cell parameters c and a. The effective hydrogen storage capacity decreases with increase of a/c.