我国首个GSM-R系统工程项目的监理实践

由北京全路通信信号研究设汁院设计、北京现代通信信号工稗咨询公司（以下简称现代公司）监理、中铁电气化局集团施工、华为技术有限公司提供设备的我田首个GSM—R工程项目，经过近一年的施工安装调试，已在大秦线上成功投入运营。在北京局和太原局的大力关怀、支持和帮助下，现代公司对此监理项目，直面困难，高度重视，集思广益，认真监理，严守承诺，根据该项目特点和工程实际，制定并落实各项针对性措施，顺利完成了该项目的监理工作，并获得铁道部领导好评。以下就该工程项目的监理实践谈些体会。     

Stereo effect of image converted from planar

Research on planar-to-stereo image conversion has significant theoretical and practical implications for image processing. In this paper we use a method which segments an image into sub-blocks to perform this kind of conversion; parameters such as random variables are used for conversion control. We use two quantitative criteria, cross-entropy and root-mean-square error, to evaluate the stereo effect. Furthermore, the stereo effect that the random variables create is discussed. The results of the experiment show that, (i) when all random variables have the same distribution, different values of these random variables only slightly affect the stereo effect; and (ii) when different distributions are applied to the random variables, the cross-entropies or root-mean-square errors are slightly different, which indicates different distributions have a small influence on the stereo effect. Generally, we recommend normal distribution for better stereo effect in most cases.     

ModBUS协议通讯的应用

ModBUS协议具有侦错能力强、数据传输量大、实时性好等特点，因而成为目前自控领域使用非常广泛的通讯语言．本文通过一个应用实例介绍如何利用微机编程实现在线通讯ModBUS消息环的工作过程．在可视化语言环境下完成地址域、功能代码域、数据域的分配及CRC校验，从而实现计算机与远程控制单元数据传输。     

EDTA interfacial chelation Ca2+incorporates superhydrophobic coating for scaling inhibition of CaCO3 in petroleum industry

In this paper,the superhydrophobic poly(vinylidene fluoride)/fluorinated ethylene propylene/SiO2/CNTs-EDTA(PFSC-EDTA)composite coating was successfully fabricat...     

Myoglobin/gold nanoparticles/carbon spheres 3-D architecture for the fabrication of a novel biosensor

A novel biosensor based on a myoglobin/gold nanoparticles/carbon spheres (Mb-AuNPs-CNs) 3-D architecture bioconjunction has been fabricated for the determination of hydrogen peroxide (H₂O₂). Cyclic voltammetry (CV), Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) were used to characterize the bioconjunction of the AuNPs-CNs with Mb. Experimental results demonstrate that the AuNPs-CNs hybrid material is more effective in facilitating electron transfer of the immobilized enzyme than CNs alone, which can be attributed to the unique nanostructure and larger surface area of the bioconjunction. The biosensor displayed good performance for the detection of H₂O₂ with a wide linear range from 0.28 μmol/L to 116.5 μmol/L and a detection limit of 0.12 μmol/L. The Michaelis-Menten constant K _M^app value was estimated to be 0.3 mmol/L. The resulting biosensor exhibited fast amperometric response, and good stability, reproducibility, and selectivity to H₂O₂. This article is published with open access at Springerlink.com     

氯化聚乙烯对氯丁橡胶与甲基丙烯酸甲酯接枝共聚反应的影响

研究了高氯氯化聚乙烯(HCPE)对氯丁橡胶与甲基丙烯酸甲酯接枝共聚及其反应产物的影响。结果表明,HCPE能加快聚合速率,提高转化率、接枝效率和接枝度。含HCPE的产物,含有较高分子量的级份,分子量分布较宽,树脂相的分布比较均匀,并具有较好的机械性能和较高的粘接强度。     

马钢炼钢除尘泥综合利用技术

对马钢转炉炼钢除尘泥的综合利用技术进行了总结.近年来,马钢对资源和环境保护的日益重视,通过研究、实验和设计,不断开发出炼钢除尘泥利用新工艺,其中一些工艺应用于生产实践,取得了较好的成效.     

Characteristics and durability test of magnesium phosphate cement-based material for rapid repair of concrete

This paper presents some research results on characteristics and durability of magnesium phosphate cement-based material, such as strength, coefficient of thermal expansion, drying shrinkage, corrosion protection, deicer-frost resistance, abrasive resistance and strength loss while soaking in water or 3% NaCl solution. Experimental results indicate that MPB materials posses high deicer-frost resistance, high abrasion resistance and high corrosion protection for reinforcing steel. In addition, the MPB materials have good compatibility and bond with old concrete, and very low drying shrinkage. However, for the MPB materials soaked in water or 3% NaCl solution for a long time, the strengh loss occurs. Laboratory and field studies show that the MPB materials are suitable for rapid repair of concrete structures. especially pavements aiport runways, bridge decks and key municipal roads, etc.     

Novel transparent and flexible nanocomposite film prepared from chrysotile nanofibres

In the present study, chrysotile nanofibres, obtained from physicochemical dispersion of natural chrysotile, were used to prepare nanofibre sheets by vacuum filtration. As-prepared sheets were then impregnated by UV-curable resin and cured by ultraviolet light to fabricate the flexible and transparent nanocomposite films. Observed from SEM, the transparent films showed a smooth surface and a typical sandwich structure in cross section, viz. nanofibre sheet filled with resin was sandwiched by two layers of resin. XRD patterns indicated the amorphous nature of cured resin and characteristic crystallographic structure of chrysotile in nanocomposite films. Though the nanofibre sheets were white in colour, and nanofibre contents in nanocomposites were as much as 43.4 wt%, the nanocomposite films displayed an excellent optical transparency with about 85% light transmittance in the visible light range. Tensile tests showed that the addition of nanofibres resulted in a great improvement in mechanical strength of the nanocomposite films; with the increase of nanofibre contents, the modulus and tensile strength of nanocomposite films increased gradually.