用C51系列单片机设计物体分级设备的测量光幕

首先介绍了光幕测量高度的原理 ,给出了高度测量光幕的一种实现方法 ,分析了由该方法设计的系统结构和主要性能。从而彻底解决了相邻通路间的干扰 ,提高了测量精度。     

活塞综合检测仪的研制

介绍了活塞综合检测仪的功能、组成、检测过程、测量原理与方法和主要技术性能指标。该仪器是国内研制的第一台智能型活塞综合检测仪。实际应用表明,这是一台高精度、高稳定性和高效率的检测仪器。     

热物理性质测试技术研究现状和发展趋势

本文在对热物理性质研究在热能工程、材料科学、信息科学、航天工程、环境工程、生物科学、微电子技术和计量学等众多科技领域中的重要性进行探讨的基础上，评述了热物理性质测试技术的研究现状和发展趋势。鉴于薄膜材料在微电子器件、集成电路和微电子机械系统等领域中日益广泛的应用，本文还综述了亚微米－纳米尺度薄膜材料热导率和热扩散率的测试新技术。     

镀锌测厚仪

本文叙述了Ｘ射线荧光测厚仪的原理、特点及测量头的设计考虑原则。并以我们研制的两种镀锌测得仪为例作了详细说明。     

贵冶三期配料仓皮带秤改造

本文从原理、结构及特点分析了贵冶配料仓皮带秤由机械式皮带秤改为电子式皮带秤的必要性及效果。     

PV module dynamic impedance and its voltage and frequency dependencies

The paper presents a derivation of the dynamic impedance of a PV module. At each bias voltage, the general form of the impedance describes a semicircular locus in the complex impedance plane. Intercepts of each impedance locus yield series, shunt and dynamic resistance of a module. Determinations of the dynamic impedance of a x-Si PV module in the dark with five reverse bias voltages and over a frequency range of 1 Hz to 60 kHz are made. The experimental results validate the derived general form of dynamic impedance.     

X射线机不是计量器具

计量学的基本理论指出，X射线机不具有计量器具的属性。国家的计量法规并未将X射线机定为计量器具。目前存在的JJG 40—2001《X射线探伤机》检定规程，将X射线探伤机与X射线检测技术相互混淆，将X射线探伤机的某些技术性能，说成所谓的X射线探伤机的“计量性能”，不仅违反计量学基本理论，而且也不符合射线检测技术实际。从计量学理论和射线检验实际经验只能得到X射线机不是计量器具的结论。     

多声路超声波流量计在引水明渠中的流量测量分析

介绍了多声路超声波流量计在明渠中的流量测量原理,并通过多声路时差式超声波流量计在引水明渠上的实例应用对影响流量测量的误差源进行了具体的分析。     

未确知有理数在机械工程中的应用研究

介绍了未确知有理数的概念，分析了未确知有理数与随机数的关系，给出了未确知有理数的加减运算。以齿轮模数的测定研究了未确知有理数在机械工程中的应用。     

Comparing interpolation techniques for monthly rainfall mapping using multiple evaluation criteria and auxiliary data sources: A case study of Sri Lanka

Interpolating climatic variables such as rainfall is challenging due to the highly variable nature of meteorological processes, the effects of terrain and geography, and the difficulty in establishing a representative network of stations. While interpolation models are being adapted to include these effects, often the rainfall data contain significant gaps in coverage. In this paper, we evaluated rainfall data from an agro-ecological monitoring network for producing maps of total monthly rainfall in Sri Lanka. We compared four spatial interpolation techniques: inverse distance weighting, thin-plate splines, ordinary kriging, and Bayesian kriging. Error metrics were used to validate interpolations against independent data. Satellite data were used to assess the spatial pattern of rainfall. Results indicated that Bayesian kriging and splines performed best in low and high rainfall, respectively. Rainfall maps generated from the agro-ecological network were found to have accuracies consistent with previous studies in Sri Lanka.