共查询到20条相似文献,搜索用时 265 毫秒
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根据所做减速度仪校准情况的汇总,其静态校准基本能满足JJF 1168—2007《便携式制动性能测试仪校准规范》(以下简称《规范》)规定的技术要求。而其动态校准基本上都是不能满足《规范》规定的技术要求的。文章将减速度仪校准中所存在的问题提出来,以供同行参考、共同探讨。 相似文献
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我单位是建筑安装施工企业 ,主要从事大型的工业与民用建筑及安装。在计量器具的合理配置及校准间隔的确定方面 ,我们进行了一些尝试 ,取得了效益。在个别项目部我们安装了轴重仪 ,汽车一过直接读取数值打印单据。据收料部门统计 ,一年光砂石料一项就少支付二十几万元。但在使用中我们发现 ,轴重仪是对汽车每一轮轴通过台面时份量相加得出整车物资总量 ,每个轴重均会产生不同误差。下面几个因素都会影响轴重仪的准确度 :(1)汽车过轴重仪时的速度、方向 ;(2)轴重仪前后备用跑道要与台面水平 ,并且足够长 ;(3)汽车过轴重仪台面时不能… 相似文献
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激光跟踪仪作为大尺寸精密坐标测量仪器,其动态定位误差精度备受关注。而其校准技术还停留在静态校准和动态跟踪性能校准的状态下。在少有对激光跟踪仪动态定位误差校准的前提下,通过对激光跟踪仪的误差分析,提出了基于速度三角波的激光跟踪仪动态定位误差校准方法,并对校准模型中运动目标的规律和运动轨迹进行了分析,设计了激光跟踪仪校准实验。实验结果论证了校准方案的可行性和必要性,对最大测量速度赋予了更为详细的定义。 相似文献
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A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling. 相似文献
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O'Brien RS 《Radiation protection dosimetry》2003,105(1-4):95-100
Australia has several uranium mines and a large number of mineral sand mines, with associated processing facilities. Exposures resulting from these mining and processing operations usually involve intakes of mixtures of radionuclides. This work describes the development of a suite of first order, linear compartment models, based on the ICRP Publication 66 respiratory tract model, and an analytical solution to the decay equations, for assessing the consequences of such intakes. The computer programs based on these models directly compute excretion, organ retention and organ and whole-body doses for intakes of either single radionuclides or any mixture of radionuclides belonging to the same radioactive decay chain. The intake can be via inhalation, ingestion or injection, and can be acute, chronic or of limited duration. The starting concentration and degree of secular (dis)equilibrium can be specified for each radionuclide. No assumptions need to be made about the relative magnitudes of the radioactive half-lives of the different nuclides. 相似文献
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本文根据多年的实践检定经验 ,参照JJF1 0 59- 1 999《测量不确定度评定与表示》以及《测量不确定度表达 1 0讲》 ,对卧式金属罐容量的测量结果不确定度进行了评定。 相似文献
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An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue. 相似文献
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