关于变电站设备安装与调试的探讨

变电站设备的安装与调试是电力设备正常运行的关键。本文从设备安装的要点、安装设计的论证、设备的安装与调试，以及设备管理等方面提出了一些在实践中积累的安装与调试经验，为电力设备安装人员提供一些建议，仅供参考。     

浅谈石油化工设备安装工程质量检验评定标准

石油化工设备的安装质量对保证石油化工企业的正常生产活动有着重要的意义．颁布严格的质量检验评定标准，有利于规范设备的安装工作，、提高设备的安装质量，确保企业生产活动的正常进行．文章介绍了石油化工设备安装工程质量检验评定标准的内容和作用，并提出了利用该标准提高石油化工设备安装质量的方法．     

论高速线材精轧区设备轧制中心找正技术

精轧区设备对中仪整体联调中心、标高技术比以往传统的安装方法提高了安装精度，可以有效地避免安装的累积误差，使得安装中心、标高精度超过了国家标准，保证了设备的安装质量。     

分析当代建筑工程设备安装

当代工程设备安装已作为施工安装的重要质量控制手段，一直以来都是施工关注的焦点。设备的安装不仅仅影响到工程整体进度，也是影响工程质量的主要因素。以下首先分析了建筑工程和建筑工程设备安装的现状，其次结合自己的工作实际对建筑工程设备安装的管理及发展的前署进行了阐述，最后提出了具体的措施，期望能给同行有所借鉴。     

250t/d转鼓碎浆机安装工艺

转鼓碎浆机设备体积质量大、安装精度要求高。文章结合设备安装过程，比较详细地介绍了该类设备的安装工艺。     

浅谈污水处理厂设备安装质量管理

污水处理设备安装是污水处理厂的核心，安装工程质量的优劣直接影响到污水处理厂的正常运行和经济效益的获得，因此说需要加强对设备安装质量的控制和管理，本文就以此为出发点，简单的论述提高设备安装质量的措施，希望能够提升污水处理厂设备安装质量。     

大型火电机组机务设备安装工程技术管理探讨

本文通过对大型火电机组机务设备的安装工程技术管理进行分析，主要包括制定机务设备的安装流程、做好安装工程的前期工作及控制安装机务设备的过程等方面，对安装技术进行严格控制、管理，确保整个安装工程项目的经济效益。     

电站锅炉及附属设备安装工艺简析

电站锅炉是火力发电厂三大主机设备之一，因设备巨大一般都以散件形式在现场组合安装，这就使得锅炉安装工序复杂，安装工艺要求较高。本文基于安装工艺的特点，结合笔者电站锅炉安装经验，从安装前的准备工作，到安装中的注意事项，以及安装后的检验、试验注意事项这三个方面展开分析，旨在帮助提高锅炉及其附属设备在安装方面的有效性。     

虚拟装配技术在设备安装工程中的应用

本文就虚拟装配技术的实现方法进行了论述，并就其在设备安装工程中的应用进行了介绍，可供设备安装技术人员参考。     

专业音响灯光工程施工要领及技巧(下)

设备的安装与布局设备的安装是工程施工中施工量很大的工作，随着它的进行，工程的各种特点和概况也逐渐定型，所以一般的技术人员在安装设备时心情都比较急迫兴奋，除了按照设计位置摆放外，对安装时的一些要领就没有过多讲究了。这种现象一定要避免。１音箱的布局与安...     

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.