浅谈沉降时间对二甲基二氯硅烷水解产物收率的影响

介绍了二甲基二氯硅烷水解反应机理及恒沸酸水解工艺,探讨了恒沸酸水解工艺生产过程中沉降时间对水解物收率的影响。     

纳滤恒容除盐过程分析

本文介绍了纳滤恒容除盐过程。讨论和分析了间歇纳滤恒容除盐过程和连续的滤恒容除盐过程的原理和性能,并分别对不同方式的间歇纳滤恒容除盐和不同方式的连续纳滤恒容除盐客纳滤恒容除盐的应用提供理论依据和指导。     

XYG—X45—1730钢丝压延联动线恒张力导开装置的开发

钢丝导开装置的恒张力性能是钢丝帘布生产中控制质量的一个重要因素,在介绍几种导开情理张力装置的基础上,叙述了自主开发的恒张力装置及性能。     

变脱盐率连续间歇纳滤恒容除盐

本文介绍了变脱盐率连续间歇纳滤恒容除盐过程。分析了变脱盐率连续间歇纳滤恒容除盐过程的原理和性能 ,对纳滤膜脱盐率随盐含量的变化、变脱盐率对恒容除盐过程性能的影响及连续间歇纳滤恒容除盐过程优化等方面作了详细讨论 ,为连续间歇纳滤恒容除盐的实际应用提供依据和指导。     

复合参数法采样恒氢调节系统

介绍了复合参数法采样恒氢调节系统的氢表线性化,复合参数及复合系数的求法,还介绍了调节系统功能,给出了组态图。     

三种偏心堵塞器的对比

精细化分层注水的关键是配水器,目前应用最广的配水器是偏心配水器,偏心配水器中堵塞器使用最多的是普通可调堵塞器,恒流堵塞器逐渐被重视应用,恒流可调堵塞器处在现场试验改进阶段。本文分析对比了三种堵塞器,详细介绍了普通可调堵塞器和恒流堵塞器的工作原理,以及在使用中遇到的问题,描述了恒流可调堵塞器的设计目标。使用模拟井试验系统试验,得出恒流堵塞器在工作两月以后仍然有很好的恒流效果,而恒流可调堵塞器恒流效果差,仍需改进。     

恒沸精馏模拟计算

本文开发了塔顶产物为非均相恒沸物的恒沸精馏定态模拟算法。将恒沸精馏塔分为包括再沸器的塔体、冷凝器和液体分层器三部分,对三部分依次串联迭代计算。经五个实例模拟计算表明,只要操作条件指定合理,本算法只需要用很简单的初值,能以较快的速度收敛到正确解,同时所需计算机内存较小。     

恒流技术在电捕集油器中的应用

分析了用于电捕集油器的可控硅高压直流电源存在的问题，介绍了新型恒流电源的控制方式，结构特点。实际使用表明，恒流电源在系统的适应性，稳定性和除焦油效率等性能均优于可控硅电源。     

恒流高压直流电源在化工生产中的应用

介绍新型HL系列恒流高压直流电源系统的构成及其在天然气乙炔工程中的应用、安装及调试。     

卷绕头恒张力控制系统

主要介绍恒张力控制变频收卷系统的原理、卷绕过程中生产工艺的要求,以及控制系统调试中应注意问题。     

二溴邻硝基偶氮胂的纯化,性质及其钍络合物的稳定常数

研究了钍的新试剂二溴邻硝基偶氮砷（ＤＢＯＮＡ）的纯化方法和性质。测定的其离解常数（ｐＫａ）、质子化常数（ｌｏｇＫｐ）分别为１０．１７和－４．７５。求得钍络合物的组成为１：２，其积累稳定常数为２７．９８。     

Piezoelectric and Dielectric Properties of Acrylonitrile Butadiene Rubber/Lead Magnesio-Niobate Piezoelectric Ceram

A new composite with special piezoelectric property was prepared by using lead magnesio-niobate piezoelectric ceram powders (PMN) as dispersing phase in acrylonitrile butadiene rubber (NBR) matrix. The dielectric and piezoelectric properties of the composite were studied. The result shows that the particle size of 80% of PMN ceram powders was 0.5–2 µm. The piezoelectric constant (d₃₃) of the composite increased with increasing volume fraction of PMN, and the max piezoelectric constant is 33 when the PMN volume fraction is 85%. Appropriate delay of polarizing time with increasing polarizing voltage could be helpful to improve the d₃₃ value. The optional polarizing condition is 25 min, 7–8 kv/mm, and 80°C. The dielectric constant increased with the increasing of the PMN volume fraction. Polarized time, polarized voltage, and polarized temperature have no effect on the dielectric constant.     

旋转黏度计测定水泥浆体静态屈服应力和黏弹性研究

采用旋转黏度计进行了恒定剪切速率、应力松弛、蠕变试验,研究了水泥浆体的静态屈服应力和黏弹性.结果表明:新拌水泥浆体属于带有屈服应力的黏弹性流体,其静态屈服应力为弹性向黏性转变时所对应的剪切应力;恒定剪切速率、应力松弛、蠕变试验均能测试出水泥浆体屈服应力和黏弹性.在恒定剪切速率试验中,新拌水泥浆体的屈服应力测试依赖于测试时剪切速率的选择,剪切速率过小,水泥浆体不出现静态屈服应力,剪切速率过大,测试的静态屈服应力较小;在应力松弛和蠕变试验中,测试出的水泥浆体静态屈服应力较恒定剪切速率试验的精确.对于一个静态屈服应力未知的新拌水泥浆体,可先采用恒定剪切速率试验粗略选择剪切速率和剪切应力范围,之后采用应力松弛或蠕变试验进行精确测试其静态屈服应力.     

低压恒温甲醇合成系统的设计及应用

论述了低压恒温甲醇合成系统工艺流程的特点,介绍了水管式甲醇合成塔内件的结构形式和选型方案;通过生产运行数据分析,总结了低压恒温水管式甲醇合成塔的应用效果。     

Effect of sintering temperature on structural and dielectric properties of Bi and Li co-substituted barium titanate ceramic

Bi and Li co-substituted barium titanate, Ba_0.98(Bi,Li)_0.02TiO₃ ceramic samples were sintered at different temperatures using conventional solid state sintering technique. X-Ray Diffraction patterns confirm tetragonal phase in all the sintered samples. Microstructure analysis using Scanning Electron Microscopy (SEM) reveals increasing grain sizes with an increase in sintering temperature. Dielectric spectroscopy performed in the range of 40 Hz to 2 MHz at room temperature shows that the dielectric constant increases with increasing sintering temperature, reaching a maximum of value of 1200 at 40 Hz where the dielectric loss observed was less than 0.02 for samples sintered at 1300 °C. Temperature dependant impedance spectroscopy data in the range of 30–300 °C was used to measure AC conductivity. The activation energy of grains was deduced through Arrhenius plots. Loss tangent at different frequencies for 1300 °C sintered samples was less than 0.1 over the entire temperature range. The high dielectric constant with a low dielectric loss at elevated temperatures make Ba_0.98(Bi,Li)_0.02TiO₃ samples suitable for Multi-Layer Ceramic Capacitors (MLCC)s used in high-temperature applications.     

助滤剂增强恒压过滤机生产能力的计算方法

论述了恒压操作预涂助滤剂后,由于介质阻力发生变化对过滤机生产能力的影响,并提出了预涂助滤剂后,过滤介质常数的计算式。     

绕线机绕线张力控制方法分析

分析胶管和电缆等纤维线绕线机的绕线过程和绕线张力,得出绕线张力变化发生在排线跃层提速的过程中,建立了恒转速模式下的绕线张力计算模型,得出绕线张力变化率正比于小线轴卷绕转速平方和线直径,并给出了恒转速控制方法的应用范围,其经济性好。与恒转速控制方法相比,当选取的小线轴卷绕转速和线直径较大时,恒线速度控制方法的绕线张力控制效果更优,但系统复杂性和成本显著提高。     

Dielectric Properties of (Sr1 - xPbx)TiO3, SPT Ceramics (= 0.05, 0.1, and 0.15) and Phase Transition of SPT (x = 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3)

Dielectric properties of (Sr_{1 - x}Pb_x)TiO₃-SPT (x = 0.05, 0.10 and 0.15) and phase transitions of SPT (x = 0.05, 0.10, 0.15, 0.20, 0.25 and 0.30) ceramic samples are investigated. At 10 kHz relative permittivity of SPT(x = 0.05) has one maximum, SPT(x = 0.10) and SPT(x = 0.15) show the main relative permittivity peaks and the secondary peaks at lower temperatures. The primary dielectric constant peaks could be due to the phase transitions from the paraelectric to ferroelectric phases on cooling and the source of the secondary peaks is not clear. Lattice parameter vs. composition, x shows a linear relation and phase transition has also a linear relation to the composition.     

Determination of Henry’s law constant and the diffusion and polytropic coefficients of air in aviation fuel

The volume change of air microbubbles on surface nucleation sites was studied experimentally and compared with predictions. Measurements were used to determine the polytropic constant, the diffusion coefficient, and the Henry’s law constant of air in distilled water, dodecane, and JP-8 aviation fuel. The liquids were exposed to sub-atmospheric pressures, but above their vapor pressures. In one type of experiment, bubble size reduction was recorded as the liquid’s ambient pressure was increased from a low pressure to atmospheric pressure though a series of step increases. The results were used to determine the polytropic constant. In another type of experiment, bubble growth was monitored in time following a sudden reduction in the liquid’s pressure from ambient. The Epstein-Plesset model of mass diffusion was coupled with a Lipschitzian optimization technique to determine the values of the diffusion coefficient and Henry’s law constant.     

合理选择裂隙岩体注浆方法的判据研究

根据弹性变形理论分析了巷道围岩裂隙开度在注浆过程中增大和恢复的机理 ,提出了采用稀水泥浆液注浆时 ,选择常量法和常压法的判断准则 ,给出了使用该判据选择合理注浆方法的步骤