Procedure for Measuring Low Concentrations of H2 and H2S Above a Water Surface

A simple measuring procedure for low concentrations of H₂ and H₂S (at the level of ppm fractions) above the surface of water by using sensitive gas analyzers is suggested. The procedure is easily accomplished in conditions outside the laboratory (under field conditions).     

Increasing the corrosion resistance of equipment due to the use of film-forming amines

Results of a study of tube specimens cut from hot-water boilers show that film-forming octadecyl amine (ODA) used in the process of preservation removes deposition from the surface of the metal. An ODA film is preserved on the surface after repeated washing of the latter with hot water. The concentration of chlorides at the surface of the metal after treatment with ODA is lower than before the treatment. __________ Translated from élektricheskie Stantsii, No. 11, November 2005, pp. 15–18.     

Stress Concentration Factors for a Circular Hole in Curved Beams Under Bending Loads

Abstract: As a contribution to the field of stress concentration studies, the case of circular hole in curved bar elements under bending is hereby studied. Trend values of stress concentration factors (SCF) are presented based on selected variables of the problem for two critical hole locations. The results will help to identify an SCF law for practical use by applying the statistical method of regression analysis. Two approximations obtained by means of computational methods are compared with those obtained by photoelastic experimental method.     

构建完整的宽带网络综合计费管理系统

为适应网络发展的需要 ,有线宽带运营商需要通过一套完整的宽带网络计费管理系统 ,从硬件到软件、从前台到后台对各个方面进行管理 ,实现统一、规范、快速的信息化、网络化电脑管理 ,降低运营成本 ,提高工作效率 ,以过硬的服务质量、优惠的价格、丰富的内容吸引用户。     

统一经营信息服务平台及其工程应用

本文介绍了统一经营信息服务平台的建设背景、目标及系统的体系结构,并以辽宁联通为例阐述统一经营信息服务平台系统在工程中的实际应用.     

The rate of corrosion of concrete reinforcement and possibilities of its mathematical modelling

The paper describes a method for the mathematical modelling of steel reinforcement corrosion rate. This method is based exclusively on experimental results and expression of the influence of significant corrosion factors in the form of functional relations. The method takes into account the reality of the effects of corrosion factors, their contigency and complexity, and various circumstances occurring in practice. It represents one way towards the development of methods for the prediction of service life of reinforced concrete and structures.     

VARIATIONS IN ALFALFA JUICE SOLUTE CONCENTRATIONS AS WATER IS EVAPORATED

Alfalfa juice was extracted from plants during the graving phases of the first and second crops. The alfalfa juice was dried and solute concentrations were measured periodically during the process using freezing point depression (FPD) as an indicator. Solute/solvent weight ratios were calculated from the freezing point depression of fresh unconcentrated 'uice extracted from both firsc and second crops. At the time of harvest, tie FPD was a function of this ratio. The first and second crops behaved distinctively different during the drying process, with the second having a larger soluce concentration and a greater FPD at a given moisture content. The appearance of preci itate during the drying process and the general1 large FPD makes this materiay a questionable product for drying vitg low temperature processes.     

水文学的研究方法与理论创新

回顾了水文学在其 30 0余年的形成和发展中曾出现过的若干引人入胜、富有启发性、对学科发展起着重要推动作用的研究成果 .论述了“假设”、“猜想”、“推理”、“比拟”、“综合”和“实验”等研究方法的运用在水文学理论创新中的重要作用 .     

21世纪职业制服流行特点

在社会经济不断发展,科技不断创新,信息快速传播的社会里,人们对职业制服的要求已经不是满足 人们身体机能上的实用功能和社会功能,而是从精神领域中去考虑,向着人性化、个性化、审美化等方面去发展。     

旋风管不同排尘结构内流场及颗粒浓度场分析

采用智能型五孔球探针测试技术及等动采样方法，对两种新型旋风管排尘结构内的流场及颗粒浓度场进行测量。通过大量实验，发现在双锥内部存在的二次流及涡流使得颗粒分布呈现横向返混状态，这不利于颗粒的分离，对单锥与双锥两种不同排尘结构内的流场及颗粒浓度场分布特点进行了对比研究，为进一步优化旋风管排尘结构，提高分离性能奠定了实验基础。