煤气测量已不再是难题超声波流量计在煤气测量中的应用

超声波流量计在煤气测量应用中的最大特点是无运动部件，无压损，可实现“在线插拔”和在线清洗，适用于大管径、低压力的介质测量，量程比宽达150：1。[编者按]     

动态称重测力技术的现状和发展趋势

本从动态测量、自动在线测量、模型化测量和数字化测量等四个方面,阐述了称重测力技术的现状和发展趋势,简要介绍了动态称重测力的特征及研究方法,叙述了自动在线测量的必要性及常用的自动秤,指出了模型化、数字化测量的意义及开发软件技术的重要性。     

测力称重计量的某些发展动向

本文从动态测量、自动在线测量及模型化测量三个方面，阐述了测力称重计量的某些近期发展动向．简要介绍了动态测力称重的特征及研究方法，叙述了自动在线测量的必要性及常见的自动秤，并指出模型化测量的意义及开发软件技术的重要性．     

透明玻璃钢的在线测量

本提出一种在线测量透明玻璃管外径和壁厚的方法，章中介绍了这种测量方法原理，系统组成，测量准确等方面的内容。     

我国精密电磁测量成果引人注目

在一年一度的国际精密电磁测量会议（CPEM’96）上，我国发表的学术论文普遍受到各国专家的关注。这标志着我国在精密电磁测量技术中达到了国际领先水平。1996年6月17日至22日，在德国布伦瑞克召开的国际精密电磁测量会议和国际科学数据委员会基本物理常数任务组会议上，46个国家的596名代表参加了这次规模最大、水平最高的国际学术交流会。会议期间还展示了从直流到微波、时间频率、光频测量、基本物理常数测量等领域的科技最新成果。我国在会议上发表了5篇学术论文，尤其是中国计量科学研究院与南京大学合作的“高温超导谐波混频器在我…     

测量过程的统计控制

本文根据科技、经济和社会发展的需求，对美国率先开展的“计量保证方案”服务的核心问题－测量过程的统计，从基本概念，原理到实施条件，步骤以及检验方法等，进行了系统，简要的论述。     

河北省计量院一项科研装置达到国内领先水平

近日，由河北省计量院承担的河北省科研计划“在线气体密度计”科研装置．经专家组鉴定．技术水平已达国内领先。该装置解决了以往混合气体密度间断测量的问题．为企业提供了在线连续测量手段．使检测数据更具准确性和科学性．填补了我国混合气体密度在线连续测量的空白。     

测量误差与不确定度表述中的若干问题

对测量误差与不确定度表述中的某些重要问题，从概念、逻辑和形式上进行了比较深入和系统的分析与研究，并重申了作者曾提出的关于测量误差、测量结果与测量不确定度的定义；以“范围”不确定度取代“扩展”（展伸）不确定度；以及对测量误差的“定性”与测量不确定度的“定量”等说法的见解。旨在引起重视、深入探讨、充分理解、促进共识。     

智能化射频原油含水率测量仪

本文论述了用射频方法在线连续测量原油含水率的传感器电路以及单板机组成的信号处理系统。该仪器与目前国内外同类产品比较,具有在原油高含水范围内自动识别“油包水”和“水包油”状态”,以及在低含水量程内分辨率高、线性度好等特点。误差分析和现场实验比对结果表明:在0～100%含水量程内,测量精度可达土(0.1～2)%。     

测量过程统计控制

ISO10012：2003《测量管理体系测量过程和测量设备的要求》在“引言”(Introduction)开章明义地指出：测量管理体系的目标是管理由于测量设备和测量过程可能产生的不正确结果而影响该组织的产品质量的风险。用于测量管理体系的方法(Methods)包括从基本的测量设备验证到测量过程控制中统计技术的应用。     

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.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

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.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

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.……     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.