利用VB.net实现重力式自动装料衡器检定后的数据处理

一、概述 重力式自动装料衡器又称定量自动衡器（以下简称“定量秤”）,主要通过设定额定重量值（即预设值）对固体物料进行称量装料,一般用于食品、化工等生产企业.     

OIMLR61（1996E）“重力式自动装料衡器”国际建议执行要点

ＯＩＭＬＲ６１（１９９６Ｅ）“重力式自动装料衡器”国际建议执行要点蔡常青（中国计量科学研究院，北京１０００１３）一、引言随着自动衡器的蓬勃发展，“重力式自动装料衡器”已在称重领域占据了较重要的地位，并已日益广泛地应用于国民经济各个部门。近年来，申请做...     

关于混凝土配料秤检定的思考

目前,浙江省和山东省已经分别出台JJG（浙）96—2007《混凝土配料秤》、JJG（鲁）66—2008（（混凝土配料秤》地方计量检定规程,但由于国家没有正式出台专门针对混凝土配料秤的国家检定规程．难免让未出台地方检定规程的同行困惑,到底应依据什么进行检定？笔者注意到目前的争论点主要集中在JJG539—1997《数字指示秤》、JJG648—1996《非连续累计自动衡器》、JJG564—2002《重力式自动装料衡器》3个国家计量检定规程。定义往往简明扼要说明了衡器的基本情况．我们通过罗列不同规程中的定义并结合相关资料比较分析：     

混凝土配料秤两种故障的排除方法

混凝土配料秤是定量自动衡器的一个分支,是通过自动称量方式将散状物料（如骨料、水泥、水、掺和料、外加剂等）合成为预定且相对固定重量和配比的装料（混凝土）的设备。混凝土配料秤主要包括一个或多个称重单元和与其相关的一个或多个自动给料装置,以及相应的控制装置和出料装置。混凝土配料秤使用的正常与否关系到混凝土的配比质量,直接影响到工程质量,对原材料消耗成本的计算也有影响。笔者在混凝土配料秤计量检定中发现的大部分故障是传感器故障。下面介绍笔者总结的故障排除方法,望对同行有所帮助。     

减量衡器(失重秤)称量准确度的考核方法

QB/T1-2501-2000《重力式自动装料衡器》在等效采用国际法制计量组织(OIML)R61《重力式自动装料衡器》国际建议的基础上，已经在我国正式实施。一种减量称量衡器的有关计量要求和技术要求也包括在该标准中，谈一点减量衡器如何采用标准的体会。     

大型料斗秤无砝码标定装置解析

大型料斗秤的计量性能标定一直是困挠我国衡器行业的一大难题,特别是在冶金行业的使用用户中反映更为强烈.本文从国际法制计量组织OIML R76-2006《非自动衡器》、OIML R107-2007《非连续累计自动衡器》、OIML R61-2004《重力式自动装料衡器》中对于料斗类衡器的称量标定需要砝码的现实出发,介绍了两种现场无需砝码的快速校验装置,特别是一种基于数字传感器的料斗秤标定装置供同行参考,对大型料斗秤现场无砝码标定方法的制定也有一定借鉴价值.     

电脑组合秤校准技术的研究

电脑组合秤具备称量准确度高、称量速度快等优点,尤其适用于颗粒质量较大或颗粒质量不均匀的散状物料的定量包装称量。定量包装商品净含量计量准确与否关乎消费者的合法权益。目前常用的定量包装商品生产设备大多采用物料和控制衡器(间接比较法)进行计量校准,适用于重力式自动装料衡器^[1],缺少电脑组合秤计量校准的方法。文章根据电脑组合秤的组合称重原理,研制一套模拟常用物料形状和质量的载荷,通过高准确度等级的砝码给模拟载荷精准赋值,可以实现电脑组合秤的静态标定和动态计量校准,提出了电脑组合秤的校准方法,可以减少计量过程中的不确定度。     

影响定量自动秤准确度的重要因素

一、一个被忽视的问题 在JJG564-2002《重力式自动装料衡器（定量自动衡器）》检定规程中,除了要求将一些与称量性能有关的＂最大装料＂、＂额定最小装料＂、＂最大称量速率＂、＂准确度等级＂、＂准确度等级的参考值Ref（x）＂、     

浅析混凝土配料秤的检定

目前,混凝土配料秤一般用于实践中的有X(1)、X(2)两种准确度等级。按照JJG564-2002《重力式自动装料衡器(定量自动衡器)》检定规程,在对配料秤进行检定时,是以物料检定为主,并没有明确说到静态检定。但在实际检定中,必须先采用JJG539-1997《数字指示秤》检定规程对配料秤进行静态检定,对不符合JJG539-1997要求的秤,可予以标定,再重新检定直到合格。其次采用JJG564-2002进行动态检定,这样才     

谈谈对JJG555-1996的理解--兼与简志毅同志商榷

JJG555-1996《非自动秤》通用检定规程是等效采用OIML R76编写的，作为非自动秤检定通用的技术要求的总规程。根据我国习惯和各种非自动秤的结构特征、计量原理以及计量性能的不同技术要求．又细划分制定了JJG13-1997（（模拟指示秤》检定规程、JJG14—1997《非自行指示秤》检定规程和JJG539—1997《数字指示秤》检定规程3个子规程。在JJG555-1996规程第1章“适用范围”中规定：“具体检定，执行相应秤的国家检定规程。”     

基于“NTN”校准法的相位解卷绕技术

基于“NTN”校准理论,分析了“NTN”校准法中的相位卷绕问题及其带来的误差.提出了适用于“NTN”校准法的相位解卷绕技术,给出了使用相位解卷绕技术的“NTN”校准法的计算机仿真结果.     

On the theory of superfluidity of helium II near the λ point

The present state of the theory of superfluidity of helium II near the point is reviewed. The basic assumptions underlying this theory and the limits of its applicability are discussed. The results of the solution of some problems in the framework of the theory are presented and compared with experimental data. The necessity and possibility of further comparison of the theory with experiment are emphasized.     

21世纪制造业市场需求特征及形成机理

简要介绍了当今市场环境的“３Ｃｓ”特征,分析了“３Ｃｓ”市场环境下客户满意度评价和市场竞争力构成的四个主要要素,建立了“竞争要素－客户满意度配置”模型和“市场需求特征结构”模型,并从经济、非经济和个性基础三方面研究了个性化需求特征的形成机理。     

多孔阳极氧化铝模板制备的研究进展

多孔阳极氧化铝(PAA)以其独特的结构特征在纳米材料方面得到了广泛的应用。综述了PAA模板的传统制备方法,并阐述了基于传统"酸性场致溶解"理论提出的二次氧化和Imprint法的局限性。着重综述了近两年来广泛关注的形状各异的PAA模板的制备方法。     

Hazard analysis of technologies for disposing explosive waste

Hazards are identified for six different techniques for disposing decommissioned ammunition. Use has been made of functional modelling as a basis for hazard identification. Risk levels are estimated based on general accident rates in the chemical industry. The disposal techniques are "open burning" (OB), "open detonation" (OD), "closed detonation" (CD), "fluidised bed combustion" (FBC), "rotary kiln (RK) incineration", "mobile incineration". Closed detonation leads to most hazards and highest risk, followed by open burning and open detonation. The other three techniques are considerably safer. Risk due to transport is included in the analysis. Transport risk is not negligible for fluidised bed combustion and rotary kiln incineration at centrally located sites.     

Critical free-surface flow over a semi-circular obstruction

Numerical solutions are presented for the problem of two-dimensional critical flow of an ideal fluid over a semi-circular obstacle attached to the bottom of a running stream. The upstream Froude number and downstream flow speed are known in advance, and are therefore computed as part of the solution. The dependence of flow behaviour on obstacle size is discussed.     

Shear-induced crystallization of polypropylenes: effect of molecular weight

The crystallization kinetics of three polypropylenes with different molecular weights was studied during shear under isothermal condition with a fibre pull-out device. Nucleation and growth under shear were observed and compared to static conditions. The crystalline growth rate was measured both in static condition and under shear. In static condition, the morphologies are -phase spherulites and are formed from nuclei which are randomly distributed. Under shear -phase morphologies are still observed but the nucleation density and the growth rate depend on the shear-rate. The nucleation density is strongly enhanced by shear and acts as the main factor on the overall kinetics. The growth rate increases with the shear-rate, but the basic growth mechanisms seem to be unmodified. phase appears after shear during the relaxation of the orientation.     

Stochastic stability of a plate in a magnetic field

Summary The almost sure asymptotic and the uniform stochastic stability of a rectangular, beam-like, conducting plate in an exterior, normal to the plate middle surface magnetic field are investigated. The plate is simply supported on the two opposite edges and subjected to time-varying compressing forces which are assumed to be Gaussian stochastic processes. The problem is solved by means of the direct Liapunov functionals method. The uniform stability and the almost sure asymptotic stability regions are obtained for white and non-white compressing processes respectively. The influence of material magnetic properties on the stability regions is investigated.With 4 Figures     

Probing combinatorial library diversity by mass spectrometry

The feasibility of a "massively parallel" mass spectrometric method for probing combinatorial library diversity is addressed theoretically for the example of computer-generated mass distributions of combinatorially synthesized peptide libraries containing between two and seven amino acids. We study the behavior of several "global" (integral) parameters of such mass distributions [Formula: see text] mass centroid, dispersion, skewness, and kurtosis. The centroid and dispersion are shown to carry information that may characterize the completeness of the synthetic effort. "Local" mass distribution parameters, e.g., "mass density" (number of peptides per mass interval), are also examined. The practical implementation and eventual limitations of such an approach are discussed as well.