Surface acoustic wave characterization of a thin, rough polymer film

Laser generated surface acoustic waves (SAW) in a heterodyne diffraction scheme is a powerful technique for elastic characterization of thin films and it is frequently used on samples of high optical quality. We show that the method can also be effectively used in difficult conditions, on rough samples. Measurements are presented on a 3 µm thick film of polymer, spin-coated on steel, and on the same sample after addition of an aluminum coating. The experimental data are interpreted using a model assuming a stack of perfect layers. The analyses show good consistency within the SAW results for both configurations, and consistency with nano-indentation results, cross-validating both approaches.     

Effect of high pressure processing in combination with Weissella viridescens as a protective culture against Listeria monocytogenes in ready-to-eat salads of different pH

This study explored the effect of HPP (400 MPa/1 min) and a Weissella viridescens protective culture, alone or in conjunction, against Listeria monocytogenes in ready-to-eat (RTE) salads with different pH values (4.32 and 5.59) during storage at 4 and 12 °C. HPP was able to reduce the counts of the pathogen after treatment achieving approximately a 4.0 and 1.5 log CFU/g reduction in the low and higher pH RTE salad, respectively. However, L. monocytogenes was able to recover and grow during subsequent storage. W. viridescens grew in both RTE salads at both storage temperatures, with HPP resulting in only a small immediate reduction of W. viridescens ranging from 0.50 to 1.2 log CFU/g depending on the pH of the RTE salad. For the lower pH RTE salad, the protective culture was able to gradually reduce the L. monocytogenes counts during storage whereas for the higher pH RTE salad in some cases it delayed growth significantly or exerted a bacteriostatic effect. exerted a bacteriostatic effect. The results revealed that the increased storage temperature led to an increase in the inactivation/inhibition of L. monocytogenes in the presence of W. viridescens. The combination of HPP and W. viridescens is a promising strategy to control L. monocytogenes and can increase safety even when a break in the chill chain occurs.     

高压取样器的研究与应用

针对钟控、电控取样器下井前要预设时间，操作繁琐，油水界面难以掌握，取样成功率低，在高凝油、稠油井重量轻无法用钢丝投送取样，研制了不用时间控制，通过上提下放钢丝绳控制，取样器在井下重复开启和关闭的摩擦式取样器和随管柱下入不怕遏阻，在坐封和解封封隔器的操作中控制取样器开启和关闭的滑套式取样器，并设计了相关取样工艺，解决油田高压物性取样难题。     

全套管薄壁灌注桩在山区某工程基坑支护中的应用

结合工程施工实例,介绍了全套管薄壁灌注桩的施工工艺流程、关键工序的主要事项,并与其它大直径灌注桩进行对比,说明该桩型作为基坑支护的围护桩具有较大的经济社会效益和广阔的市场前景,同时也对存在的问题做了总结。     

Active protection coatings with layered double hydroxide nanocontainers of corrosion inhibitor

Novel LDH-based nanocontainers of corrosion inhibitor are developed in the present work. The reservoirs are composed by nanostructured layered double Mg/Al and Zn/Al hydroxides with divanadate anions located in the interlayer regions. The nanocrystalline LDHs (layered double hydroxides) are able to release vanadate ions in a controllable way.XRD, EDS and SEM methods were used in this work to study morphological and structural properties of the synthesized LDH powders. Corrosion protection effect of the LDH powders directly added to corrosive electrolyte or to commercial coatings used for aeronautical application has been studied by electrochemical impedance spectroscopy and standard accelerated corrosion tests. Aluminium alloy 2024 was used here as substrate.The results demonstrate that both of the LDH pigments being added to corrosive media confer corrosion inhibition effect, especially Zn/Al based nanocontainers obtained by the anion-exchange approach. The coatings doped with Zn/Al LDH-nanocontainers provide well-defined self-healing effect and confer corrosion protection properties superior than currently used environmentally unfriendly chromate-based systems.     

隔离开关的防护锁及变压器两端断路器控制回路的改造

对变电站停电送电的隔离开关的防护锁及变压器两端断路器控制回路进行改造，以提高操作隔离开关时的安全性和变压器操作的准确性。实验证明，这种改造措施简单、经济、可靠，具有很好的实用价值。     

微机接口系统中的抗干扰措施

微机接口系统设计的成功与否,很大程度上取决于抗干扰性能的优劣。尤其是工业生产过程控制和检测的应用场合,其周围环境比较恶劣,干扰源比较复杂,为了确保微机系统工作的可靠性,对干扰采取防护措施就显得十分重要了。 在微机接口系统中,干扰途径主要有以下三种:电源干扰,地线和幅射干扰,I/O通道干扰。该文针对以上干扰源介绍几种实用的抗干扰措施。     

钢的热处理加热用保护涂料的研究

本文论述了钢的热处理加热用保护涂料的特性及涂覆工艺,同时测定了涂料的保护效果.结果表明:保护涂料无毒,涂层同钢的结合力强,在800～1200℃温度范围内具有较佳的保护效果.     

卸料板推管二次推出压铸模设计

针对复杂壳体压铸件难以脱模的问题，分析了复杂壳体的工艺特性，设计了卸料板、推管二次推出压铸模,论述了模具工作原理和结构特点，并且通过胀型力的计算选择了压铸机。该模具推出机构的异形摆块使卸料板和推管产生速度差，实现铸件的二次推出，解决了工件变形的问题。模具结构紧凑，工作可靠，成型工件满足质量要求。     

A test battery related to ergonomics of protective clothing

Specialised protective clothing, such as that worn by firefighters, is usually tested only to standards which give requirements for the materials used (e.g. EN469). However, this testing often neglects the effect the manufacturing process of the garment has on the material properties, the effects of clothing design, sizing and fit, as well as the interaction of the clothing with other components of the standard gear for the profession. Such effects can only be tested by looking at the protective gear as a whole. This paper deals with methods to do additional testing on protective garments with firefighter clothing as example. In other words, methods which go beyond EN469. Human subject tests for physiological load, heat protection, ergonomic design, loss of performance, rain/moisture protection and conspicuity/visibility of the clothing are described and proposed for evaluation of protective clothing in general and for further development of standards on firefighters' clothing.