CNAS认可公告

天津市公安局物证鉴定中心（证书号：L4109） 认可范围：生物物证检验（DNA），法医检验、法医损伤检验，痕迹检验，电子物证，文件检验，指纹检验，毒化检验，理化检验，照、录像检验。     

基于C/S结构商品净含量检验系统的设计与实现

文章通过分析人工录入定量包装商品净含量检验数据和数据处理弊端,创建了一套行之有效的计算机管理和处理检验数据的方案。详细介绍了定量包装商品净含量检验系统设计的需求和功能实现,包括检验数据录入、智能化处理数据、自动打印检验记录和检验报告等。阐述了采用国产编程语言--易语言和Microsoft Access2000数据库相结合,开发设计基于C/S结构的商品净含量计量检验系统的全过程。本文所设计的净含量计量检验系统可以满足检验人员现场检验或实验室检验、智能化处理检验数据和打印检验记录、检验报告的工作需求,实现快捷、高效开展商品净含量计量检验工作目的。     

压力容器不同检验体系的比较研究

压力容器有监督检验、ASME授权检验、用户监造、采购监造、第三方检验等几种检验体系,这些检验体系有着不同的背景、目的、内容、管理体制和利益相关方,而它们的检验方法和方式又是相同的,文中比较了不同检验体系的区别和联系,探讨了不同检验体系存在的合理性、必要性和可能的发展情况,以及如何能避免重复检验的发生。     

硫酸锰分析方法的探讨与优化

检验硫酸锰含量过程中，发现此方法对反应条件的要求非常严格。而硫酸锰的检验方法中没有对反应条件做详细说明，所以检验人员在检验时，经常发现检验结果达不到标准。为保证检验数据的准确性，对硫酸锰的检验操作细节加以研究和验证。     

2006年上海出口纸箱质量析解

我们上海出入境检验检疫局包装检测中心，肩负着从上海口岸进出的包装检验工作。本文所反映的上海出口纸箱质量情况就是从日常出口纸箱抽检中汇总出来的，检验的项目包括纸箱的常规物理性能检验和装运出口危险品的纸箱的运输性能检验。检验的依据是SN／T 0262-93《出口商品运输包装瓦楞纸箱检验规程》和GB19270.2-2003《水路运输危险货物包装检验安全规范性能检验》。     

分析锅炉检验的重要性及内容与方法

锅炉是一种承压设备，其工作的过程涉及安全问题，所以，对锅炉展开科学的检验至关重要。锅炉检验并非是一件简单的工作，所以锅炉检验应该有步骤、有系统的展开，要在科学安排的情况下展开检验工作，同时，锅炉检验必须使用多种检验检测方法，提高检验的准确性。     

浅谈实验室的产品质量检验

主要介绍了产品质量检验的概念、产品质量检验的功能和步骤以及对仲裁检验和抽样检验的分析。     

检测机构委托检验的细节风险控制

0引言"委托检验"通常是指企业为了对其生产、销售的产品质量把关,或者是对其购进的生产原料的质量掌控,委托具有法定检验能力的检验机构进行检验。检验机构依据标准或协议约定对来样检验,出具检验报告给委托人,检验结果仅对来样负责。1委托检验业务的发展状况委托检验不同于监督抽查和执法检查,是企业的自主自愿行为。随着社会的发展和进步,目前我     

标准化及信息化建设在检验检测机构中的重要性分析

本文简要介绍了加强检验检测机构标准化及信息化建设的必要性，通过对现阶段检验检测机构标准化及信息化建设中存在的问题进行分析，来探讨检验检测机构标准化及信息化建设的有效措施，旨在转变传统的检验检测工作模式，促进检验检测机构的专业化发展，保障检验检测结果的准确性，提高检验检测工作效率，满足新时期下人们对检验检测工作的要求，从而推动检验检测机构的长远发展。     

谈食品检验准确性提高的控制因素

食品质量检验是依据某食品执行的产品标准所进行的符合性检验，出具公正性检验报告，检验结果判定为合格或不合格。食品质量检验是技术性很强的一项工作，反映实验室的能力水平。在食品检验过程中，应严格从检验流程的各个环节加以控制，从抽取样品，样品制备、仪器设备选择，化学试剂配制、检验方法选择、实验室环境控制、操作人员的熟练程度及对相关检验项目的检查等几方面，确保获得准确的检验结果。     

顶空气相色谱法测定盐酸法舒地尔中有机溶剂残留量

本文应用顶空进样方式,DB-624毛细管柱分离,FID检测器,外标法定量测定盐酸法舒地尔中乙醚,甲醇,二氯甲烷残留量,结果3个组分完全分离.分离度为甲醇,乙醚之间为19.0,乙醚和二氯甲烷之间为20.8.在所考察的线性范嗣内具有良好的线性关系,相关系数r分别为甲醇0.9993,乙醚为0.9997,二氯甲烷为0.9963...     

金属材料试样制备与力学性能试验结果的相关性 第一讲 试样的取样部位及机加工与力学性能试验结果的相关性

介绍了金属材料试样制备与力学性能试验结果的相关性。对国家标准中关于力学性能试验试样取样和机加工的要求、力学试验取样和制样过程中需要注意的问题、机加工质量的检验等问题进行了讨论。结果表明金属材料试验试样的制备与力学性能试验的结果有着非常密切的相关性,由于这个原因,力学试验试样的取样和机加工必须严格按照国家标准的要求进行,机加工后必须检验加工质量,以保证力学试验结果的正确性。     

Electrical properties of CFC- and HCFC-substitutes

Electrical properties of refrigerants are of importance as soon as bushings are surrounded by a refrigerant. This is the case e. g. for hermetic sealed motor compressors as well as for some control devices such as liquid level control units or capacity controls for compressors. This paper presents a survey of existing data for HFC refrigerants and presents new measurements for those HFC blends that have been identified as long term replacements for CFCs and HCFCs. The data collection includes permittivity, electrical conductivity and breakdown voltage. Values are given for the HFC blends R404A, R407C, R410A and R507 as well as for R134a.     

顶空-气相色谱法测定水中乙醛、丙烯醛和丙烯腈

建立了顶空-气相色谱法测定水中乙醛、丙烯醛和丙烯腈的分析方法。该方法分离度好,灵敏度高,水中乙醛、丙烯醛和丙烯腈的检出浓度为0.03mg/L、0.07mg/L、0.04mg/L,回收率分别为86%~115%、81%~110%、80%~108%。结果表明,顶空-气相色谱法测定水中乙醛、丙烯醛和丙烯腈方法简单快捷,准确,适合地表水、废水中乙醛、丙烯醛和丙烯腈的同时测定。     

Approximating the risk for time-to-failure models through using statistics of extremes

This paper studies the approximation of the partitioned multiobjective risk method's (PMRM) extreme event risk function for time-to-failure models. The analytic expression of the approximation for the extreme event risk function is derived through the use of the statistics of extremes for the case where the underlying distribution is of an extreme-value type III for minima. This analytic expression provides an effective theoretical tool for understanding the behavior of conditional expected values for time-to-failure models for a large class of distribution functions used in reliability. The results are confirmed for example problems of exponential and uniform distributions.     

Treasure of the Past IX: Exposure Standardization of Iodine-125 Seeds Used for Brachytherapy

A method for calibrating iodine-125 seeds in terms of exposure has been established. The standard free-air ionization chamber, used for measuring soft x rays, was chosen for the measurements. Arrays of four to six seeds were used to enhance the ionization-current-to-background-current ratio. Seeds from an array were measured individually in a re-entrant chamber. The quotient of the exposure rate for the array by the sum of the ionization currents in the re-entrant chamber is the calibration factor for the re-entrant chamber. Calibration factors were established for three types of iodine-125 seeds. The overall uncertainty for the seed exposure calibrations is less than 6%.     

钛合金技术引进中的知识产权分析研究

通过分析新型材料中钛合金材料专利与非专利技术的现状与发展,尤其针对钛合金技术专利申请情况、关键技术引进状态、关键技术分布、重点专利等,提出了钛合金材料关键技术的引进方向及知识产权保护策略,同时为该领域的研究与发展、专利风险规避和预警提供可靠的专利技术情报支撑。调研了国内武器装备钛合金关键技术引进现状及知识产权保护情况,重点开展了钛合金技术国内外专利情况分析以及关键技术引进中的知识产权保护现状分析,并通过图表的形式,明确了钛合金技术在引进过程中的可行性。研究成果可应用于武器装备新型材料的研发,为装备新型材料先进技术引进或借鉴提供依据。     

Flow fields in shell-and-tube condensers: comparison of a pure refrigerant and a binary mixture

Detailed 2D CFD calculations for vapour flow field and rate of condensation are carried out for a geometry similar to a real shell-and-tube condenser with 100 tubes, with condensation on the shell-side. The differences in vapour flow behaviour are investigated for pure R22 and for a binary mixture of R32 and R134a, which has a gliding temperature difference of 5.5 K. It is shown that, the flow field for a zeotropic mixture is significantly different from that for a pure fluid. The nature of the mixture flow causes the vapour and condensate to flow counter-currently in part of the condenser. Adjustments of the inlet design turn out to influence the rate of heat transfer by up to 24% for the conditions tested, with greater influence on heat transfer for lower driving forces.     

Coating material innovation in conjunction with optimized deposition technologies

Concentrating on physical vapour deposition methods several examples of recently developed coating materials for optical applications were studied for film deposition with optimized coating technologies: mixed evaporation materials for ion assisted deposition with modern plasma ion sources, planar metal and oxide sputter targets for Direct Current (DC) and Mid-Frequency (MF) pulsed sputter deposition and planar and rotatable sputter targets of transparent conductive oxides (TCO) for large-area sputter deposition.Films from specially designed titania based mixed evaporation materials deposited with new plasma ion sources and possible operation with pure oxygen showed extended ranges of the ratio between refractive index and structural film stress, hence there is an increased potential for the reduction of the total coating stress in High-Low alternating stacks and for coating plastics.DC and MF-pulsed sputtering of niobium metal and suboxide targets for optical coatings yielded essential benefits of the suboxide targets in a range of practical coating conditions (for absent in-situ post-oxidation ability): higher refractive index and deposition rate, better reproducibility and easier process control, and the potential for co-deposition of several targets.Technological progress in the manufacture of rotatable indium tin oxide (ITO) targets with regard to higher wall-thickness and density was shown to be reflected in higher material stock and coater up-time, economical deposition rates and stable process behaviour. Both for the rotatable ITO targets and higher-dense aluminum-doped zinc oxide (AZO) planar targets values of film transmittance and resistivity were in the range of the best values industrially achieved for films from the respective planar targets. The results for the rotatable ITO and planar AZO targets point to equally optimized process and film properties for the optimized rotatable AZO targets currently in testing.     

Benchmark problems for wave propagation in elastic materials

The application of the new numerical approach for elastodynamics problems developed in our previous paper and based on the new solution strategy and the new time-integration methods is considered for 1D and 2D axisymmetric impact problems. It is not easy to solve these problems accurately because the exact solutions of the corresponding semi-discrete elastodynamics problems contain a large number of spurious high-frequency oscillations. We use the 1D impact problem for the calibration of a new analytical expression describing the minimum amount of numerical dissipation necessary for the new time-integration method used for filtering spurious oscillations. Then, we show that the new numerical approach for elastodynamics along with the new expression for numerical dissipation for the first time yield accurate and non-oscillatory solutions of the considered impact problems. The comparison of effectiveness of linear and quadratic elements as well as rectangular and triangular finite elements for elastodynamics problems is also considered.