室内供暖系统的材料选择与使用

供暖管道材料如焊接钢管和铝塑复合管的选择。供暖管件的选用，采用焊接钢管时的管件及阀门，使用铝塑复合管时的管件及阀门。散热器的选用要求包括：热媒选用要求、经济性要求、安全要求、装饰协调要求和求新要求。     

复合材料管研究现状

分别介绍了玻璃钢管、铝塑复合管、钢塑复合管的各自特点、生产方法、优缺点等，并与其它管材作了比较，分析了复合材料管与普通金属管、塑料管的优势，得出各种复合材料管的今后发展趋势。     

散热器专业安装很重要

选用优质配件散热器零配件质量问题及安装材料质量问题是导致暖气漏水的主要原因之一。所以,应该到正规市场选用国家优质水暧配件。铝塑复合管一般是散热器所用到的管材,铝塑复合管的铝层接头有搭     

铝塑复合管用塑料材料的性能研究

对用于铝塑复合管的不同种PE原料的力学性能、熔体流动速率、维卡软化点等性能进行了测试 ,并研究了标记铝塑复合管不同种用途的色母料的加入对材料性能的影响。试验得出 :色母料加入硅烷交联聚乙烯能降低其交联度 4 %左右 ,在基料与色母料配比为 10 0 :1时 ,材料的力学性能最佳     

首次“火炬论坛”——铝塑复合材料产业发展论坛举办

国家科技部火炬中心、国家新材料产业发展战略咨询委员会和中国建材工业协会铝塑复合材料分会于2002年11月7～8日联合主办了“铝塑复合材料产业发展论坛”。参会的有来自各省市的铝塑复合板和铝塑复合管的生产企业、原材料和设备供应商、施工应用及经销单位、科研院所、投资商等。第29届奥组委和建设部及相关协会的专家们在会上就产业发展趋势、产品应用和科技创新等问题做了主题报告。与会者共同研讨了行业状况和市场竞争态势，一致认为必须与时俱进，持续发展，配合国家火炬计划的实施，以企业需求为主体，努力促进铝塑复合材料产业的健康…     

铝塑复合管隐蔽安装质量隐患的预防

针对铝塑复合管在施工过程中易被损坏的特点,介绍了在管道预埋和安装的过程中应注意的事项及预防措施.     

孔网钢带塑料复合管的使用与发展

随着人们对饮用水的质量提出了更高的要求,解决和防止饮用水的二次污染显得尤为重要。孔网钢带塑料复合管是一种新型的管道,它具有耐腐蚀、抗渗漏、不生锈、安装容易等特点,成功地解决了铝塑复合管无法作为主给水管道的问题,是传统镀锌管和球墨铸铁管的替代品。     

采暖工程埋地铝塑复合管安装

随着燃气壁挂炉采暖的发展,埋地铝塑复合管在采暖管道系统的应用越来越多。其优点在于分户独立供暖,便于物业管理;管道埋地敷设,扩大了使用面积,充分利用了能源,楼板亦可散热。     

浅谈铝塑包装机吹气成型异常现象

本论文对我司BM350国产铝塑包装机进行分析，根据现有技术及包装机械特点，参考进口设备的优点，集合其设计理念，在铝塑包装机原有机构基础上，针对铝塑包装机在实际生产中出现的成型故障问题，结合设备使用经验，设备常见故障处理技巧，开展国产设备设计缺陷改造，通过对设备加热板正确调节、成型站吹气压力精准控制、成型站模具快速冷却，有效的控制该设备在生产使用过程中出现成型异常故障，从而实现降低铝塑包装机设备故障率，减少包材物料的用量，提升人均劳效的目标。     

高密度聚乙烯复合管市场分析

介绍国内外高密度聚乙烯复合管材应用、生产状况，并对市场要求进行分析和完测。     

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.