期间核查与稳定性考核的关系

JJF1069-2012《法定计量检定机构考核规范》中规定:"应根据规定的程序和日程对计量基(标)准、传递标准或工作标准及标准物质进行核查,以保持其检定或校准状态的可信度".ISO/IEC17025:2005《检测和校准实验室能力的通用要求》规定:"当需要利用期间核查以保持设备校准状态的可信度时,应按照规定的程序进行."可见期间核查也是一项法定要求.     

计量实验室中的期间核查

正GB/T27025-2008 idt ISO/IEC17025:2005《检测和校准实验室能力的通用要求》和JJF1069-2012《法定计量检定机构考核规范》中规定:"应根据规定的程序和日程对参考标准、基准、传递标准或工作标准以及标准物质进行核查,以保持其校准状态的置信度。""当需要利用期间核查以维持设备检定或校准状态的可信度时,应按照规定的程序进     

浅谈实验室测量仪器设备的期间核查

0引言期间核查是指为保持对设备校准状态的可信度,在两次检定（或校准）的间隔期内的核查。包括参考标准、基准、传递标准或工作标准以及标准物质进行核查,以保持其校准状态的置信度。在ISO／IEC17025：2005《检测和校准实验室能力的通用要求》和JJF1069-2012《法定计量检定机构考核规范》中都有要求。     

如何使用实验室内高等级计量标准开展期间核查

正自从ISO/CASCO(国际标准化组织/合格评定委员会)制定的实验室管理标准ISO/IEC17025(《检测和校准实验室能力的通用要求》)提出期间核查的概念后,期间核查迅速被中国合格评定国家认可委员会(CNAS)检测和校准实验室能力认可、实验室资质认定考核和法定计量检定机构考核采用,成为实验室质量控制的重要环节。     

期间核查中有关问题之我见

<正>为了保证在用计量标准装置、测量设备在两次检定/校准间隔之内的准确可靠,并保持良好置信度的检定/校准状态,JJF1069-2007《法定计量检定机构考核规范》提出了计量标准和测量设备的期间核查要求。根据JJF1069-2007的要求,全国     

期间核查--一种简单的测量过程控制

ISO／IEC17025《检测和校准实验室能力的通用要求》、JJF1069（法定计量检定机构考核规范》等许多文件对于对社会出具公证数据的机构。均有条款要求它们利用期间核查以维持计量标准和设备检定或校准状态的可信度，以保证其对外出具数据的可靠性。本文依据实际工作的可行经验阐明了对期间核查概念的理解，参阅文献介绍了期间核查的方法，提出利用期间核查的统计结果服务检测工作。     

电子天平的期间核查/运行检查

0前言电子天平是一种计量器具,是检测实验室的主要检测设备之一,按照《中华人民共和国计量法》,出具公众数据的计量器具每年必须进行强制检定/校准。为了了解电子天平的状态,维护电子天平在两次校准期间校准状态的可信度,减少由于仪器稳定性变化造成的结果偏差,有必要对电子天平进行检查[1]。对电子天平在两次周期检定/校准之间所进行的核查,叫做电子天平的期间核查[2]。在计量认证中称“运行检查”。《CNACL201-2001实验室认可准则》(等同采用ISO/IEC17025∶2005[3]、《计量认证/审查认可评审准则[》4]中均提出了对参考标准、测量设备…     

尖峰信号发生器期间核查方法

0引言 CNAS-CL01《检测和校准实验室能力认可准则》中提到了期间核查,所谓期间核查是指实验室仪器设备的操作人员,在两次正规的检定/校准间隔期间,为保持设备校准状态的可信度,防止使用不符合技术规范要求的设备,对仪器设备的技术指标进行的核查。     

简述期间核查在检定/校准工作中的作用

本文简述计量标准和仪器设备的期间核查在提高实验室检定/校准可靠性,以及期间核查方法和问题分析等。     

期间核查在计量检定/校准工作中的重要性

本文阐述了计量标准和检测设备的期间核查在实验室质量管理工作中的重要性,即提高计量检定/校准的可靠性,以及期间核查方法、步骤及核查结果处理。     

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.