Methodological problems in the investigation of thin hardening films

We present the results of experimental and numerical-analytic investigations of thin hardening films and discuss some methodological problems encountered in this case. We propose the relations for the evaluation of fracture stresses under cyclic bending and residual stresses taking into account the specific features of thin coatings, as well as a computational model for the prediction of cyclic strength depending on the thickness and type of the coatings. The accumulated experimental data confirm the indicated dependences. __________ Translated from Problemy Prochnosti, No. 2, pp. 99–112, March–April, 2007.     

不同膜厚的NiO薄膜电致变色特性的研究

主要研究膜厚对NiO薄膜电致变色特性的影响，通过对不同膜厚的NiO薄膜在原始、着色和褪色态的透过率光谱曲线和电流时间响应曲线的分析比较，总结出通过控制膜厚来提高NiO薄膜电致变色性能的方法。     

套管车丝机锁紧缸杆断裂的原因分析及解决方法

0　概　述我公司从美国 PMC公司引进的套管、接箍两条生产线是 2 0世纪 90年代世界先进的生产线 ,471型 CNC套管车丝机是其中最关键设备。471型 CNC套管车丝机有四组卡盘 ,距离车丝机由近及远依次为 :定位卡盘、机内浮动卡盘、机外浮动卡盘、固定卡盘。全部卡盘由液压驱动。装卡过程为 :管子传递到加工工位→固定卡盘卡紧同时定位卡盘定位卡紧→两浮动卡盘卡紧→定位卡盘松开→管端加工螺纹→三卡盘同时打开。CNC套管车丝机的装卡装置 ,使钢管中心和车丝机主轴中心完全重合 ,克服了由于钢管管径和直线度误差造成的定位误差。这种巧妙的…     

椭圆封头壁厚计算公式的讨论

对《锅炉强度计算标准应用手册》中出现两个不同椭圆封头壁厚计算公式进行分析 ,并提出一个统一的公式。     

反演技术和频谱成像技术在储层预测中的综合应用

井约束地震反演技术县有很好的垂向分辨能力，在储层横向变化不大时反演效果很好，但如果储层的横向变化十分复杂，反演技术的局限性就非常突出，要获得好的反常效果很困难。基于薄层反射调谐原理的频谱成像技术不依赖于井资料，只与地震资料的品质有关，对于储层边界，非均质及厚度的成像，分辨率尤其是横向分辨率要高于传统的宽带地震分辨率。中国东部H区块S构造带，主要目标地层厚度变化大，构造复杂，目标储层主要由砂岩、砾岩、凝灰质砾岩和火山碎屑岩组成，非均质性强。综合应用反演技术和频谱成像技术对其含油气储层的分布范围进行了预测，预测结果与验证井吻合很好。     

Influence of load on the tribological conditions in piston ring and cylinder liner contacts in a medium-speed diesel engine

The present work is an attempt to determine the oil film thickness in a medium-speed four-stroke diesel engine with a cylinder diameter of 200 mm. Experimental research on this topic was found necessary due to the limited amount of published information available with reference to engines of the present size. The experimental part of the study was carried out as firing engine tests, with an instrumented piston, equipped with telemetric data transmission, and an instrumented cylinder liner in a 6-in-line test engine. The study was carried out for different parts of the four-stroke working cycle and for different levels of engine power output. The results were compared with the results of computer simulations, carried out using a commercial software package. The conclusions of the study comprise aspects on the formation and development of the oil film between the rings and the liner under a set of load levels together with the periodical fluctuation during different strokes of the working cycle.     

磁性涂镀层测厚技术的现状与展望

简要介绍了涂镀层测厚技术的发展现状及时代特征，重点介绍了目前国内外涂镀层测厚仪典型产品的功能特点，初步探讨了涂镀层测厚技术的未来发展趋势。     

承载比试验的初步探讨

本文阐述了承载比（ＣＢＲ）试验的重要性和广泛性，以３种土类的试验，介绍了室内试验的方法和试验结果的比较；提出了运用设计ＣＢＲ值设计柔性路面厚度和确定设计ＣＢＲ值的试验方法。说明了荷载强度与贯入量之间是双曲线变化的关系．     

Oxygen limitation in static respiration activity index test

The static respiration activity index test was designed to assess the biodegradability (or biostability) of compost samples by monitoring their oxygen consumption rate under cultivation conditions. However, as revealed in this study, the measured activity index correlated not only with the biochemical characteristics of the tested sample but also with the operational conditions, including sample quantity, sample moisture content and cultivation temperature. It was speculated that this observation could be attributed to the limited oxygen transport to the sample. Hence the oxygen transport and consumption in the tested sample were modelled using a one‐dimensional, pseudo‐steady state model to estimate the relative significance of mass transfer resistance to the bioreaction rate. A so‐called critical thickness of the sample, above which mass transfer resistance became significant, was identified and assessed under various experimental conditions. The possible oxygen limitation for the static respiration test to estimate the activity index of compost samples was critically assessed. Copyright © 2006 Society of Chemical Industry     

异质结应变层的临界厚度的确定

简要介绍了异质结的临界厚度,叙述了计算临界厚度的两种理论和其实验值.