微机核子秤在大型尿素装置中的应用

介绍了大型尿素装置中微机核子秤的系统构成，测量原理、安装、调校及在调试过程中发现的问题。     

Kinetic behaviour of muscle LDH immobilized in nylon tubing

Immobilization was carried out of the lactate dehydrogenase (LDH) from rabbit muscle (EC 1.1.1.27), cross-linked through the bifunctional reactive glutar-aldehyde on to nylon tubing (1 m long, 53cm² internal surface area). Immobilized LDH inactivation kinetics are of first order (t_1/2 = 3·6 years, k = 5·4,e^?4 day^?1 to 5°C). The smaller effect of pH on activity than in the case of LDH in solution can be explained on the basis of limitation to proton diffusion towards the support. A limiting effect to free external diffusion of the substrate towards and products from the support was also observed, an effect which seems to determine the effective kinetic behaviour of immobilized LDH. The apparent optimum temperature is centred around 40°C, observing a clear inactivation (thermal denaturation) above this temperature. In the temperature range studied (10–40°C), the co-existence was seen of a kinetic control accompanied by another control, involving diffusional transport of substrates and products, on the global activity of the immobilized enzyme. This makes the Arrhenius profiles curvilinear. Both graphic and statistical non-linear regression analysis of the kinetic data—rate, v, versus substrate concentration [S]—carried out under conditions in which the diffusional limitations can be considered negligible (high recirculation flow rate), permitted investigation of the intrinsic kinetic behaviour of immobilized LDH. In this sense, it can be deduced that the rate equation to which these data seem to be fitted is of the polynomial quotient type in [S] of minimum degree 2:2. Although the diffusional limitations have a marked effect on the type of global kinetics shown by immobilized LDH, temperature was not found to affect its v[S] behaviour. The experimental evidence obtained thus indicates that the rate equation in the 10-40°C temperature range continues to be a rational equation of at least degree 2:2 in [S].     

利用短周期地脉动推断深层地基S波速度

从二维随机波场的相关理论出发，提出了如何从短周期地脉动（频率＞０．５Ｈｚ）时域信号中计算Ｒａｙｌｅｉｇｈ波弥散曲线，进而反演深层地基剪切波（Ｓ波）速度的理论方法和分析技术，并结合实测信号的分析结果，探讨了该方法的可行性和实用性。     

Ruins and Revival: Paris in the Aftermath of the Second World War

Although many devastated European cities have been studied, the bombing and reconstruction of key industrial sites and certain suburban residential zones in greater Paris have received little scholarly attention. Using archival sources, this article explores both destruction and reconstruction, and traces how homeless families shared apartments or endured years of 'temporary' accommodation in huts and other shelters. Post-war economic planning in France privileged the restoration of industrial and commercial sites; rebuilding of housing by the state, by housing co-operatives and by individual property owners received less support and progressed far more slowly. Today, the visual legacy of reconstruction is easily confused with that of completely new post-war apartments; however its origin, if not its architecture, is distinctively different and merits recognition in its own right.     

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通过对J.J.Arps方程的推导,提出了油气藏产量递减曲线分析的最佳拟合法。用该法可直接求出递减指数N、初始递减率D1及油气递减前的稳定产量Qi,避免了使用试差法的大量运算过程,大大提高了油气藏工程中指标预测的精度。     

软起动器在烧结机混料系统中的应用

软起动器以微处理器为核心，能够产生平滑的电压起动曲线，可任意设置稳定的起动电流，并具有多种保护。张钢24m^2烧结机混料系统应用软起动器后，交流电机起动平滑、无噪声，年节电5．6万kW．h，经济效益约2．4万元。     

基于注塑件收缩率预测的模具型腔尺寸生成方法研究

针对注射模具CAD/CAM系统普遍采用平均收缩率来计算模具型腔尺寸所存在的不足，提出基于注塑件的收缩率预测结果生成模具成型尺寸的方法，并给出注塑件尺寸与模具成型尺寸之间的换算方法。最后通过反求工程中的曲面重构技术完成模具型腔表面的造型。     

基桩反射波法动测曲线的数值模拟与特征分析

采用美国PDI公司开发的PDI-S软件,对不同缺陷基桩的反射波法低应变动测曲线进行数值模拟,对动测曲线的特征进行归纳与总结,以便在解释反射波法曲线时作为参考与借鉴,提高基桩质量检测的可靠度。     

带有长测量电缆的电容分压器的传输特性

该文研究了z_3=z_0,z_4=∞情况下电容分压器测量系统的传输特性,得出了U_(in)(s)=G(s)~(-1)U_0(s)在时间域的解析解及其差分形式,此解正可用于进行波形重建。给出了波形畸变与分压器、电缆及被测波形参数间的定量关系。