一种COSMIC软件规模度量质量管理方法

本文首先介绍了软件规模度量COSMIC方法,然后根据度量要素关系模型分析了COSMIC方法在软件规模中存在的问题,针对这些问题提出了检查表评审的方法,最后列出了评审检查表用于评审各阶段里程碑,到达了提高软件规模度量质量的目的。     

鹅血液生化指标测定

对凉山钢鹅、四川白鹅、川凉鹅、凉川鹅的血糖、总脂、总蛋白、白蛋白、磷、GPT、GOT 等指标进行了测定,结果表明品种间存在差异。     

鱼塘水体中CO_2快速、简便测定方法研究

水体中CO2 含量的测定 ,可以间接指示出水体中遭受有机物污染的程度 ,本文研究出一套用于养殖鱼塘中的CO2 快速、简便的测定方法     

称重系统模拟电压-频率比变换电路

分析了模拟电压一频率比变换电路原理，给出了元件参数的设计要求及其计算方法。对两路对称变化测量频率的处理使称重系统可进行增重、减重测量，电路的调频性适用于各种量程的称重系统。     

量词的数量语义特征与语法功能

从数量语义特征看，量词重叠并未产生空间量的变化，量词重叠量变发生在时间维度上，此外数量短语具有时问性和层级性，它们都不具有体词性的数量语义特征而具有谓词性的数量语义特征。从句法功能上看，量词与量词结构也不具有体词性，而具有谓词性。量词体词性的误会可以从“理论影响、意义、运用、产生”四方面来看。     

Uncertainty evaluation in proficiency testing: state-of-the-art, challenges, and perspectives

The evaluation of measurement uncertainty, and that of uncertainty statements of participating laboratories will be a challenge to be met in the coming years. The publication of ISO 17025 has led to the situation that testing laboratories should, to a certain extent, meet the same requirements regarding measurement uncertainty and traceability. As a consequence, proficiency test organizers should deal with the issues measurement uncertainty and traceability as well. Two common statistical models used in proficiency testing are revisited to explore the options to include the evaluation of the measurement uncertainty of the PTRV (proficiency test reference value). Furthermore, the use of this PTRV and its uncertainty estimate for assessing the uncertainty statements of the participants for the two models will be discussed. It is concluded that in analogy to Key Comparisons it is feasible to implement proficiency tests in such a way, that the new requirements can be met. Received: 29 September 2000 Accepted: 3 December 2000     

An error model for evaluation and interpretation of proficiency testing

Data from proficiency testing can be used to increase our knowledge of the performance of populations of laboratories, individual laboratories and different measurement methods. To support the evaluation and interpretation of results from proficiency testing an error model containing different random and systematic components is presented. From a single round of a proficiency testing scheme the total variation in a population of laboratories can be estimated. With results from several rounds the random variation can be separated into a laboratory and time component and for individual laboratories it is then also possible to evaluate stability and bias in relation to the population mean. By comparing results from laboratories using different methods systematic differences between methods may be indicated. By using results from several rounds a systematic difference can be partitioned into two components: a common systematic difference, possibly depending on the level, and a sample-specific component. It is essential to distinguish between these two components as the former may be eliminated by a correction while the latter must be treated as a random component in the evaluation of uncertainty. Received: 20 November 2000 Accepted: 3 January 2001     

Electronic speckle pattern interferometry deformation measurement on lightweight structures under thermal load

We report on the application of ESPI to measure deformations induced by thermal load on lightweight honeycomb panels for space applications. The panel was mounted isostatically onto a vibration isolated table. A housing for temperature stabilisation was constructed enclosing the panel, heating elements, fans and the ESPI-head made of Invar. Emphasis is put on the quantitative analysis of the deformation of this large object (0.8×0.8 m²) viewed from a relatively short distance of 1.1 m and illuminated sequentially from three non-orthogonal directions. Influences of laser stability, rigid body displacements, temperature inhomogeneities as well as possible deformations of the measurement head are discussed in order to derive the measurement uncertainty and to estimate corrections. Beside the sensitivity vector analysis it is important to take into account the optical light path changes due to temperature changes. Out-of-plane deformation fields of the panel are presented.     

反射式表面粗糙度光纤传感器及其模糊算法

本文提出了一种新型表面粗糙度光纤传感器,阐述了它的结构、工作原理,给出了测试结果.运用模糊算法,分析实测数据,得到系统的测量规则和隶属函数.经过模糊推理和决策计算出相应的输出值.该算法可减小测量误差,提高测量精度,扩大测量范围.本系统能准确地识别R_a分别为0.012μm,0.025μm,0.5μm,0.1μm的被测表面.     

Measuring thickness of translucent plastic by scanner

Thickness measurement is important in various engineering fields. The several methods have been used to measure the thickness. This work explains a novel method for measuring the thickness of translucent plastic materials using scanner. The plastic samples were scanned against a white and a black background and the RGB parameters of obtained images were used to measure the opacity. Then, the thickness was calculated using relationship between thickness and opacity of samples. The best thickness prediction was obtained using a 3rd polynomial regression with the XYZ parameter.