道路运输易燃易爆液体危险货物罐式车辆用呼吸阀校验与评定

阐述了呼吸阀校验现状并指出了其校验的必要性,提出了呼吸阀校验机构与人员的资质要求,并给出了校验周期与项目,其中校验项目包括:外观检查、拆卸检查、呼吸阀开启压力检查、防侧溢检查及阀座密封性试验。最后给出了校验结论与后处理方案。     

复杂蜂窝夹层结构二次胶接校验精度影响因素研究

针对复杂蜂窝夹层结构的二次胶接工艺,通过采用不同校验压力、校验膜组合模式进行校验精度影响因素研究。结果表明:在较低压力下,校验外加压力对复杂蜂窝夹层结构的校验精度影响很小;校验膜组合方式对校验精度影响较大,板-板与板-芯胶接区域采用不同校验膜组合校验方式得到的校验结果优于板-板与板-芯胶接区域采用单一校验膜校验方式的结果。根据组合校验试验结果,建立了组合校验膜选择模型并对模型进行了验证。     

高智能化、自动化和网络化的安全阀校验管理系统

针对目前安全阀校验受理效率低和校验结果受校验人员的技术水平及职业道德等人为因素影响较大,造成安全阀校验质量和效率不高的问题,开发了安全阀校验网上申请系统、解体清洗与粗调软件、校验操作端软件和出/入库软件。通过压力传感器、条形码技术和计算机网络技术将校验软件与OA系统数据库相连,实现了从约检、受理、缴费、解体清洗、粗调、整定压力校验、密封性能实验、入库、出库、校验记录填写、校验报告填写、审核和审批的整个流程的网络化作业。     

提高安全阀在线校验精度的方法

针对当前安全阀离线校验技术在海上石油生产应用中的不足之处,开发了安全阀在线校验系统以作为离线校验的一种有效补充,但是实际应用中在线校验技术还有不足之处,需要进一步的改造和完善。针对现场实际情况,提出了改进其在线校验精度的方法。     

石化装置安全阀校验及具体方法分析

针对石化装置安全阀校验及具体方法进行分析,结合安全阀门使用现状,并介绍导致安全阀门失效的主要原因和带来的危害。结合这些内容,总结了几种安全阀门校验方法,主要有:离线校验、现场热态校验、在线校验,最后探讨了石化装置中安全阀门校验发展趋势,希望通过对这些内容的分析,能够对石化企业装置的安全稳定运行提供一定帮助。     

气体小流量计的校验

在化工生产和科学试验中常常需要用小流量计来测量气体流量(测量范围在100米~3/小时以下),通常采用的是玻璃浮子流量计(LZB系列)或气远传转子流量计(LZQ系列)其精度和准确性主要取决于玻璃管、浮子的制作以及校验的方法。我们自行设计和安装了一套浮筒校验装置,除校验浮子流量计以外,还可校验双重孔板、1/4园喷嘴等非标准节流件。经长期使用,证明其校验效果良好,基本上满足了科研生产的需要。这里,主要对流量校验设备、校验方法以及校验数据的换算作以简要介绍。     

安全阀在线校验系统的开发

针对当前安全阀离线校验技术在实际应用中的不足之处,开发了安全阀在线校验系统以作为离线校验的一种有效补充,并对现有安全阀进行了改造。该系统在解决安全阀泄漏问题的同时,还具备携带方便、检测结果准确可靠、记录完整、校验过程不影响装置的正常运行等特点。     

多功能安全阀智能校验系统设计

利用组态技术,开发设计了基于C/S网络结构的安全阀多功能智能校验系统。该系统可以在现场的客户端对安全阀进行自动校验,显示校验过程中的压力、位移曲线和校验温度,并且将数据上传到管理服务器。此系统已在大连理工大学安全装备厂的生产中得到应用,实践证明,提高了安全阀校验的效率。     

腈纶在线折光仪的校验

介绍了K47型在线折光仪的原理及校验方法:折光系数校验法和浓度校验法.     

一种简易校验系统在气固两相流流速测量设备的应用

针对气固两相流流速测量设备在开发和应用时会出现各种问题的情况,利用电脑声卡、Matlab软件和研制的信号接入板设计了电厂风粉两相流流速校验系统,并在某电厂微波法测流量的实验台上进行了应用。结果表明:校验系统经济、便捷、简单可行,能够满足电厂风粉两相流流速校验和故障检测要求。同时校验系统对气固两相流测量设备的检测、维护、校验有广泛的工程实用价值。     

基于虚拟仪器的活塞发声腔校准系统的设计与实现

随着次声校准的需求越来越多,而传统的互易法校准在低频段受气体泄漏影响很大,校准效果不好,新式的激光式活塞发声腔校准法更适用于次声传声器校准。设计并实现了一套基于虚拟仪器的激光式活塞发声腔校准系统,采用超低频振动台技术,其活塞位移失真度很小,腔体中声压级稳定,声压级范围大。校准系统的软件设计灵活方便,加入声压反馈后能得到声压级很稳定的声源。     

Heat on – Calibration of IR Spectroscopy at Process Conditions for Continuous Esterification

This work tries to close the gap between continuous synthesis, measurement, calibration, and analysis on R&D scale. By introducing new calibration methods, the full potential of inline ATR-FTIR spectroscopy in continuous reactor setups is unraveled. A fast, fully automated calibration of the reaction mixtures is carried out at process conditions. The use of different compositions underlines the robustness of this calibration method, which was used for the determination of kinetic parameters. The conversion-based calibration significantly increased the precision of the analysis. In difference, the new method only requires the preparation of two calibration mixtures. By that, this method can also be applied to large-scale processes and allows the use of a single measurement setup from R&D to industrial scale.     

Decision-theoretical formulation of the calibration problem

The choice of calibration policy is of basic importance in analytical chemistry. A prototype of the practical calibration problem is formulated as a mathematical task and a Bayesian solution of the resulting decision problem is presented. The optimum feedback calibration policy can then be found by dynamic programming. The underlying parameter estimation and filtering are solved by updating relevant conditional distributions. In this way: the necessary information is specified (for instance, the need for knowledge of the probability distribution of unknown samples is clearly recognized as the conceptually unavoidable informational source); the relationship of the information gained from a calibration experiment to the ultimate goal of calibration, i.e., to the estimation of unknown samples, is explained; an ideal solution is given which can serve for comparing various ways of calibration; and a consistent and conceptually simple guideline is given for using decision theory when solving problems of analytical chemistry containing uncertain data. The abstract formulation is systematically illustrated by an example taken from gas chromatography.     

超支化聚酯分子质量及其分布的测定

采用凝胶渗透色谱-宽分布标样校正法测定超支化聚合物分子质量及分布.并和普适校正法 进行了比较,方法相对误差<8％,方法简便、快速、重现性好。     

A Dynamic Calibration Method for Crusher Gauges Based on Material Testing

This paper presents a new dynamic calibration method for crusher pressure gauges used in artillery test firings. The calibration method is based on the measurement of the plastic deformation behavior of the crusher elements in the laboratory completely isolated from test firings and measurements by reference pressure transducers. The validity of the calibration model developed is verified by comparison with the pressure records measured in artillery test firings. It was found that the calibration method developed is also suitable for the high load levels and strain rates present in tank firings.     

Calibration for measured crystal size distribution

The crystal size distribution (CSD) measured by laser diffraction technique is obtained by assuming spherical crystals. If crystals are non-spheres, calibration is responsible for the true crystal size, particle number concentration and population density. In this paper, CSD calibration equations have been deduced. It was shown that when shape factors are size-independent, the weight percent of particles is not affected by crystal shape and calibration is just a horizontal shift of measured CSD. Calibration was taken for plate-like crystals of cefazolin sodium and rod-like crystals of l-threonine. The effect of CSD calibration on crystal growth kinetics has been investigated in l-threonine-water evaporation crystallization system.     

损失重量式工业动态称量系统的剖析

介绍了损失重量式动态称量系统的构成、工作原理及校正方法。动态称量系统主要由称量料斗、称量元件、输送装置和控制装置构成,其工作原理基于受控重量的损失,电路控制的重点是称量元件和控制装置。校正方法主要为物位控制校正和变化量校正,现场校正和计算机远程控制校正的一致性是成功校正的关键。     

Gel Permeation Chromatography Calibration. I. Use of Calibration Curves Based on Polystyrene in THF and Integral Distribution Curves of Elution Volume to Generate Calibration Curves for Polymers in 2,2,2-Trifluoroethanol

Abstract

A general method is proposed for obtaining gel permeation chromato-graphic (GPC) molecular weight (MW) and hydrodynamic volume (HDV) calibration curves for polymer-solvent systems where primary polymer standards are unavailable. The method is demonstrated by using a HDV calibration curve based on polystyrene in tetrahydrofuran (THF), in conjunction with integral distribution curves of elution volume for poly(methyl methacrylate) (PMMA) in THF and in 2,2,2-tri-fluoroethanol (TFE) for the generation of a HDV calibration curve in TFE. Transformation methods for generating secondary MW calibration curves from HDV calibration curves are discussed and applied to PMMA in THF and TFE, and to poly(trimethylene oxide), poly(vinyl acetate), and certain polyamides in TFE. The utility and reliability of the secondary calibration curves are demonstrated by comparing MW average and intrinsic viscosites obtained by GPC and by the classical methods. Molecular structural differences among th polyamide samples associated with the distribution of short- and long-chain branches are discussed in relation to their secondary calibration curves.     

光纤布拉格光栅压力传感器标定中的不确定度研究

研制了一种量程为10k N的光纤布拉格光栅压力传感器标定装置,可实现光纤布拉格光栅压力传感器的标定和静态测试。对光纤光栅解调仪获得的中心波长和标准测力仪的压力值进行最小二乘拟合,求出静态标定系数,并分析了标定装置的不确定度来源以合成不确定度。试验结果表明:光纤布拉格光栅压力传感器的响应灵敏度为9.77×10~(-5)nm/N,线性度2.79%FS,经二阶拟合后重复性误差2.61%FS,标定装置的A类不确定度5.73N。     

Gel permeation chromatography of poly(dimethyl siloxane). I. The universal calibration

The Benoit universal calibration method has been tested for evaluation of GPC data of polydimethylsiloxane (PDMS) in toluene at 60°C. For the conversion of the calibration curve for polystyrene to the PDMS calibration curve, the Mark–Houwink equation for PDMS in toluene at 60°C was derived: [η] = 9.77 × 10^?5 M^0.725. The applicability of this universal calibration was proved by the experimental results on five PDMS model samples. For the correct evaluation of the PDMS elution curve, the use of the true calibration is inevitable, because the hydrodynamic volume of PDMS molecular weight unit is somewhat different from the polystyrene one.