MEMS技术在集成加热功能的双模块湿度传感器中应用研究

在需要温湿度变化剧烈的环境中,湿度准确测量的最佳方案是采用单片集成的具有除湿功能的湿度传感器,本文采用MEMS(Micro-electro-mechanical system)技术,研制出集成加热元件的双模块湿度传感器,可以实现湿度测量中交替加热除湿和交替测试功能,具有测试响应时间短、除湿功耗低、响应快速的特点。     

新型涡街流量计二次仪表

本文提出了涡街流量计用于蒸汽流量测量时存在的问题。针对这些问题设计了一种与之配套的智能化二次仪表，详细地介绍了该仪表的软、硬件设计     

一体化湿度变送器校准方法初探

近年来,随着科技不断进步,对湿度测量的要求也越来越高。一体化湿度变送器就是一类准确度较高的湿度测量仪表,但目前还没有相关的检定规程或校准规范,本文提出一种校准一体化湿度变送器的方法,并对校准装置的不确定度作了评定。     

湿度测量对音速喷嘴流量装置性能的影响

依据现有国家标准和相关规范,临界流量计算时应考虑湿度测量对音速喷嘴流量装置测量结果的影响并予以修正。可见,湿度控制和测量的合理性与准确性对标准装置性能的影响不能忽略,尤其是在实验室空间有限的条件下就更不能忽视。本文通过理论计算和测量流量计仪表系数两种方法分析湿度对测量结果的影响程度,给出合理建议以保证装置在日常工作中保持良好的计量性能。     

新型涡流量计二次仪表

本提出了涡街流量计用于蒸汽流量测量时存的问题。针对这些问题设计了一种与之配套的智能化二次仪表，详细地介绍了该仪表的软，硬件设计。     

关于机动车检测线二次仪表的探讨

二次仪表是机动车安全技术检验机构检测仪器设备的组成部分。该文在阐述二次仪表基本概念的基础上,分析了机动车检测线的设备构成和检测线控制系统的联网模式及特点,探讨了机动车检测线中二次仪表与工位机的异同,并就检测线二次仪表的实现、意义及作用进行了讨论,以便对机动车检测用的二次仪表有更好的理解。     

工业二次仪表自动检定系统不确定度分析

测量不确定度是对测量结果的一种定量评定,正确理解、评定和表述测量不确定度是十分重要的。文章介绍了新型热电偶二次仪表自动检定系统的特点及测量不确定度的分析、评定方法及结果。     

密露点仪标准装置测量不确定度评定

介绍了由精密露点仪和恒温恒湿箱等配套构成的湿度标准装置,通过建立标准装置检定湿度仪表的数学模型,分析了影响测量不确定度的多种因素,对湿度标准装置的总测量不确定度进行了评定。     

数字温度二次仪表的检定方法和故障排除

数字式温度二次仪表大量应用于工业过程中温度的测量和控制.虽然数字温度仪表有着准确度高、稳定性好、平均无故障时间长等优点,但是由于使用环境、应用环境、使用方法不当等因素的影响,将会给这类仪表造成不同程度的失准和故障.温度二次仪表的检定方法:首先短接温度仪表信号输入端,接通电源,这时仪表应显示室温,在满度正确的情况下,从起始量程开始增大输入信号(上行程时),分别给仪表输入各被检点温度所对应的标称电量值,读取仪表相应的指示值.温度二次仪表的故障排除包括:①仪表通电后显示不稳定;②仪表通电后无显示;③仪表显示溢出信号"1";④仪表显示错乱;⑤仪表显示器全亮等.     

谈“电子自动平衡式显示仪表”故障检查方法

电子自动平衡式显示仪表是广泛应用于冶金、石油、化工行业,用于连续指示记录生产过程中的工艺参数——湿度、压力以及化学成分等的仪表。下面以XWC/XQC型仪表为例分析故障检查方法。1确定故障在仪表内部还是外部对于XWC仪表,用镊子把输入端（＋）（-）连接,配热电偶温度测量仪表,指针应指室温,对于直接测量m V信号的仪表指针应指0m V,     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.