关于生产函数的新思考——理论研究与实证分析

本文既考虑了本期投入对本期产出的影响，又考虑了过去累积形成的生产成果对本期产出的重要作用，并在此前提下建立一种新型生产函数-动态生产函数。运用动态生产函数与C-D生产函数对中国和中国部分省（区、市）的实证分析表明动态生产函数较符合中国和中国地区经济发展的实际。最后就各要素对产出增长率的贡献份额进行了测算。     

局部C半群与抽象Cauchy问题

在本文中,我们讨论由算子A生成的局部C半群对应的Cauchy问题(ACP;A,T,x),将初值x的取值范围从CD(A)推广到(λ—A)~(-1)C(E).     

一种基于CiscoCatalyst2950C-24交换机的通信技术实训室的组网方案

本文介绍了现代交换网络技术的产生与发展,提出了一种基于CiscoCatalyst2950C-24交换机的"通信技术实训室"的组网设计方案.详细描述了Cisco Catalyst2950C-24交换机的工作原理、典型应用和Cisco Catalyst2950C-24在此设计方案中的应用.     

Guidelines for the protection and treatment of the abused child

The purpose of this paper is to review ten actions that can be taken by multi- disciplinary child protection teams or individuals in this field to assure that the interests of the abused child are consistently addressed.     

Delay-dependent stochastic stability and H∞ analysis for time-delay systems with Markovian jumping parameters

This paper studies the problem of the stochastic stability and H_∞ disturbance attenuation for linear continuous-time time-delay systems that possess randomly Markovian jumping parameters. A delay-dependent sufficient condition on the stochastic stability with given H_∞ performance is proposed using the stochastic Lyapunov–Krasovskii stability theory. The conditions are formulated as a set of coupled linear matrix inequalities.     

TN-C-S保护系统在低压电网中的安全运用分析

TN—C—S（TN—C＋TN—S）系统是三相五线接地保护系统，是国家用电安全强制执行的标准（GB50096-1999），标准规定：凡是新建、扩建、企事业、商业、居民住宅、智能建筑、基建施工现场及临时线路，一律实行三相五线制供用电方式；标准体现了“以人为本”的思想，从技术上把保护零线PEN的两个作用分开，即分成工作零线（N）和保护零线（PE），提高TN—C—S系统供电的可靠性、安全性及供电质量，提高用电质量水平。     

Mineralogical and microstructural characteristics of historic Roman cement renders from Budapest,Hungary

Roman cements, one of the most extensively produced types of hydraulic binders of the second half of the 19th century, played an important role in the architecture of many European countries. This paper deals with the chemical-mineralogical and microstructural characterisation of historic Roman cement renders from Budapest, Hungary. Different microscopic techniques were used on polished thin sections and fracture surfaces in order to understand the method of producing these renders and the effect of urban pollution on them. The renders exhibited characteristics typical to a Roman cement mortar, such as high binder to aggregate ratios (b/a), mostly fine-grained aggregates and high capillary porosity, but without the shrinkage cracks that are also normally present. This research suggests that coarse residual cement grains may have acted in a manner similar to aggregates by absorbing stress and thereby reducing the formation of shrinkage cracks. Based on the mineral characteristics of residual cement grains, the samples could be divided into two groups, which correspond to either a higher or lower temperature of calcination of the original source material of the cement. Chemical characteristics of the binders suggest the presence of intermixed CaCO₃ originating from the carbonation of hydration products and partly from residual calcium carbonate of the raw material. Despite dense and often impermeable coats applied in later renovations and exposure to a polluted urban environment, which resulted in formation of gypsum on the surface of the renders, the samples show good to excellent state of preservation after more than a century. The strong “house of cards”-like arrangement of the complex C-(A)-S-H-type phases is responsible for both the high capillary porosity and the good resistance of Roman cement renders to atmospheric pollution and potentially damaging salts such as Na- and K-chlorides which are found near the base of the building due to sidewalk de-icing. These results help to better understand the behaviour of historic Roman cement renders, which in turn assists in making good decisions in choosing a repair material to future restorations of 19th century façades built with this material.     

Magnesium distribution in paper subjected to deacidification investigated by means of Laser Ablation Inductively Coupled Plasma Mass Spectroscopy

Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA ICP MS) was used to investigate the distribution of magnesium in paper subjected to selected deacidification mass processes. Paper samples have been taken from the early XX century books, which had been previously deacidified with the use of either Book Saver or Bückeburg process. Both methods incorporate the use of magnesium compounds therefore the enrichment of the paper with magnesium was expected as a consequence of the undertaken deacidification. The aim of our investigation with the use of LA ICP MS was to evaluate a possible variety in magnesium distribution over paper within μ-meter resolution, depending on the applied process.     

传统完形填空与C-试题的效度对比研究

通过定性和定量研究，分析传统完形填空中的定距删词和C—试题在中国英语考试中的效度。对比研究发现，在试题的编写、评分和信度方面，C—试题优于传统完形填空，它简单、经济、客观、信度高。传统完形填空则在效度方面高于C—试题，建议将其作为一种替换题型用于综合英语能力考试中。C—试题可作为一种词汇练习形式用于课堂练习或词汇测试中。     

高压C-4204空气压缩机膜片泄漏原因分析与改造

C—4204空气压缩机是乙烯高压装置的重要设备,使用过程中由于膜片泄漏而频繁停车检修,影响了正常生产。对C—4204空气压缩机膜片泄漏的原因进行了分析,并提出具体的改造措施来延长膜片的使用寿命,经过长时间的实际使用,取得了显著的经济效益。