水准仪检定装置水平准线偏差检定方法的探讨

根据水准仪检定装置的工作原理,建立了水准仪检定装置水平准线偏差检定方法的数学模型,并以三点互调式水准仪检定装置为研究对象进行了不同检定方法的比对实验,发现了不同检定方法的检定结果存在较大差异.通过分析检定方法的数学模型,提出了引起水平准线偏差测量结果不确定度的因素,指出检定结果差异的原因,证明了水平准线标准装置检定法是检定水准仪检定装置水平准线偏差的最佳方案.     

非自动秤检定中要注意的几个问题

三个非自动秤检定规程自１９９７年颁布实施以来 ,检定人员严格执行 ,有效保证了秤的计量性能 ,受检单位在使用秤时也更有安全感 ,感觉“秤准确多了”。但在实际检定中 ,有几个需要检定人员注意的地方。１ 首次检定与随后检定的区分。首次检定与随后检定误差不同 ,造成对秤是否合格的判断不同。虽然规程对首次检定的定义及范围规定得很清楚 ,即新制造新安装秤的检定 ,已经是同厂检定后的 ,因此 ,计量检定机构执行的首次检定已经是随后检定了。我们对这些秤的检定根本不存在首次检定 ,计量检定机构所执行的所谓“首次检定”只能是使用中的首…     

汽车制动试验台检定数据处理研究

通过对汽车制动试验台传统检定方法的研究,设计了设备检定系统,完成了制动试验台的静态、动态和在线检定,实现了自动化检定.由于现场干扰多、误差较大,系统采用了数字滤波法对检定数据进行处理.通过研究检定数据的特点,选用了未确知有理数滤波算法,有效地提高了检定的准确度,实现精确检定.     

辐射温度计检定方法的浅谈

本文对检定辐射温度计所使用的标准器和检定装置的技术条件做了归纳和比较。详细介绍了检定前的准备工作、检定项目和检定步骤,总结了检定固有误差的方法和数据处理。     

对JJG694-2009《原子吸收分光光度计检定规程》的理解

原子吸收分光光度计检定项目较多,更好地理解新版检定规程对检定或校准很重要,本文简要介绍了新版检定规程中主要检定项目的检定方法及与原检定规程的区别。     

关于计量器具检定周期的思考

正作为一名检定员,工作中总会遇到设备检定周期连续不上的问题。计量检定应严格按照计量检定规程执行,检定规程中规定了检定周期,大多有如下表述:检定周期为()年,检定周期一般不超过()年。而我们出具检定证书时,有效期是指检定日期加上检定周期,这样有效期具体到了某年某月某日。     

基于虚拟仪器的指针式电测仪表自动检定系统

本文提出并设计了一种硬件结构简单的基于虚拟仪器的指针式电测仪表自动检定系统，介绍了系统的组成与工作原理，论述了检定数据修约、检定结果柱状图生成、用户数据库管理等软件设计方法。系统可按照电测仪表检定规程自动产生检定点，完成检定数据自动修约，显示、保存、打印检定结果，生成、打印检定证书，大大简化指针式电测仪表的检定过程，提高检定效率，消除人为误差。     

LPG加气机检定仪的检定

本文简要论述了LPG加气机检定仪的检定技术法规、加气机检定仪组成、技术要求和计量性能要求,并且叙述了加气机检定仪的检定程序。     

指示表检定仪示值误差校准的新方法

本文从指示表检定仪的结构原理出发 ,概述了指示表检定仪的新发展 ,对现有检定规程中的检定方法作了较深入分析 ,并由此提出新的检定方法     

关于计量器具检定周期的相关探究

计量器具检定周期在计量器具检定工作中起到了至关重要的作用,检定周期的长短影响着检定合格率、送检工作的频次以及企业备表的比重。本文主要阐述了计量器具检定周期的重要性,并对确定计量器具检定周期的原则和提高检定周期的几种方法进行初步探讨。     

Design for volume optimization of packaging for durable goods

In the literature, there are several authors arguing for the optimization of the packaging volume as an important factor in distribution efficiency. Within the context of packaging of durable goods, these authors present significant economic savings, usually illustrated by qualitative examples of redesigns. So far, these papers are limited to: (a) the economic aspect of volume (b) packaging for which the main functionality is distribution‐related, and (c) mostly qualitative empirical data. This current paper aims to contribute to this literature by: (a) arguing that volume is also a significant factor from an environmental perspective (b) including packaging for which the main functionality is marketing‐related, and (c) presenting quantitative data of over 1000 packed durable goods, covering consumer electronics, domestic appliances, toys, power tools and furniture. Several strategies for volume optimization are discussed in relation to different packaging functionalities. Copyright © 2011 John Wiley & Sons, Ltd.     

Chemical methods for searching for evidence of extra-terrestrial life

This paper describes the chemical concepts used for the purpose of detecting life in extra-terrestrial situations. These methods, developed initially within the oil industry, have been used to determine when life began on Earth and for investigating the Moon and Mars via space missions. In the case of Mars, the Viking missions led to the realization that we had meteorites from Mars on Earth. The study of Martian meteorites in the laboratory provides tantalizing clues for life on Mars in both the ancient and recent past. Meteorite analyses led to the launch of the Beagle 2 spacecraft, which was designed to prove that life-detection results obtained on Earth were authentic and not confused by terrestrial contamination. Some suggestions are made for future work.     

Optimum policy for warrants for and design of guardrails

An optimum policy for the warrants for and the design of guardrails based on benefit maximizing criteria is presented. It is shown that the strength, the number of classes of standards, and the location of guardrails should be determined simultaneously with due consideration for the nation-wide distribution of roadside dangers and the impact of colliding vehicles. Dynamic programming is used for optimization.     

船舶与集装箱用钢板预处理过程中所用磨料的对比

对船舶与集装箱用钢板涂装前预处理过程中，抛（喷）丸清理（除锈、刻蚀）用各种磨料的性质、磨料硬度与侵入性及耐久性（寿命）的关系、磨料的形状与清理效果的关系、磨料的粒度与覆盖率、冲击功的关系作了对比分析，提出了合理选用磨料的原则。     

Tolerance Limits for Surface Errors of Plates for Reflection Echelon

Expressions have been obtained for the intensity distribution of the fringes in the reflection echelon in the presence of surface errors on the plates. The errors considered are the ones arising during the polishing process, due to inhomogeneous reflection coating, and due to the residual curvature of the plates. These expressions have been utilized for the evaluation of the intensity distribution in a reflection echelon consisting of 20, 30, 40 and 50 plates. Hence permissible errors on the surfaces of the echelon plates have been obtained and it has been confirmed that in order to take full advantage of number N of the plates, surface errors should not exceed 1/4 N of a wavelength in the middle of the visible spectrum.