手动增压式液氮泵

介绍了获国家实用新型专利的手动增压式液氮泵。该泵用于与符合ＧＢ５４５８的液氮生物容器配套，向其它杜瓦、冷阱等输送液氮。评述了各种液氮传输方法，给出了新泵的原理、结构、使用方法。试验结果：平均流量达到４．１６Ｌ／ｍｉｎ，扬程大于２ｍ，传输效率９５％，质量１．６ｋｇ。使用结果证明新泵具有结构简单、质量轻、连接密封可靠、操作方便、省力、流量大、连续工作性能稳定、传输效率高等优点，是一种较为理想的液氮传输设备。     

DLC-Ⅲ(SR)立体声电影信息处理器专家视听评估会举行

ＤＬＣ－Ⅲ（ＳＲ）立体声电影信息处理器专家视听评估会举行尹世卉上海电影照相工业研究所最近研制成功ＤＬＣ－Ⅲ（ＳＲ）立体声电影信息处理器，作为该所ＤＬＣ－Ⅰ、ＤＬＣ－Ⅱ的升级换代产品，供影院用于兼容杜比（Ｄｏｌｂｙ）Ａ型与ＳＲ型制式４－２－４光学立体声...     

不同氯含量氯化聚丙烯的热降解

用ＴＧ－ＤＴＧ－ＤＳＣ法研究了低氯化聚丙烯（Ｃｌ－ＰＰ）在空气、Ｎ２气流中线性升温时的热降解，发现随Ｃｌ％增加，主链脱ＨＣＬ的失重率增大，而主链的降解失重率减小；Ｎ２气中平衡热降解温度ＴＰ１、Ｔ０．１随ＣＬ％的提高而下降，而ＴＰ２、ＴＰ３与其无关；空气中ＴＰ１、ＴＰ２随ＣＬ％的提高而下降，Ｔ０．１、ＴＰ３与其无关。     

超滤膜生物反应器处理生活污水的试验研究

用外压一体化中空纤维超滤膜生物反应器（ＵＭＢＲ）进行了处理生活污水的试验．结果表明,当水力停留时间（ＨＲＴ）为５ｈ、膜通量在４４２～１１０Ｌ／ｈ时,ＵＭＢＲ对生活污水中ＣＯＤ、浊度、ＳＳ的去除率分别可达９０％、９８％、１００％,出水ＣＯＤ＜６０ｍｇ／Ｌ、浊度＜３、ＳＳ为０,污泥质量浓度ρＭＬＳＳ、污泥负荷Ｆｒ、反应器容积负荷ＦＷ分别为６２ｋｇ／ｍ３、０４６ｋｇ／（ｋｇ·ｄ）、１８２ｋｇ／（ｍ３·ｄ）．初步探讨了超滤膜的堵塞机理,通过杀菌清洗可使超滤膜通透能力恢复到新膜的９７％以上．ＵＭＢＲ出水浊度低,水质稳定,宜于回用     

纳滤膜及其表面活性剂分离特性的研究

制备了不同规格的ＣＡ－ＣＴＡ混合纤维素纳滤膜，在１．０ＭＰａ下，对１０００ｍｇ／ＬＮａＣｌ截留率达５０％～８０％，透水率２０～６０Ｌ／ｍ２·ｈ．对１００ｍｇ／ＬＭｇＳＯ４截留率达９０％～９８％，透水率２０～６０Ｌ／ｍ２·ｈ．对１０００ｍｇ／Ｌ葡萄糖截留率达９０％～９５％，透水率２０～６０Ｌ／ｍ２·ｈ．并用该膜对十二烷基苯磺酸钠的分离特性进行了初探．ＣＡ－ＣＴＡ混合纤维素钠滤膜适用于阴离子表面活性剂的分离，其截留率达９６％～９８％，透水率２０～４０Ｌ／ｍ２·ｈ．     

FATIGUE CRACK PROPAGATION OF SQUEEZING 19v.-%-SiCw / 6061Al COMPOSITES UNDER (Ⅰ+Ⅱ) MIXED LOADING

研究了挤压１９ｖｏｌ－％ＳｉＣｗ／ＬＤ２复合材料在（Ｉ＋Ⅱ）型复合应力作用下疲劳裂纹扩展门槛值和裂纹扩展时的偏转角。用扫描电镜观察了与预测裂纹相邻的裂纹扩展区的口形貌。结果表明，在（Ｉ＋Ⅱ）型复合应力作用下，裂纹沿最大主应力方向扩展；当ΔｋＩ和ΔＫⅡ共同达到一特定值时，裂纹开始扩展；裂纹偏转角不同，扩展阻力出不同。     

改性双来亚酰亚胺树脂的研究

合成了２，２′－亚甲基－二（４－甲基－６－烯丙基）苯酚，和它增韧二苯甲烷型双马来酰亚胺树脂，对改性双马亚酰亚胺预聚物的凝胶化时间、ＤＳＣ分析和ＦＴ－ＩＲ分析的研究，得到了改性双马亚酰胺树脂体系的固化条件来１８０℃／１ｈ＋２００℃／２ｈ＋２５０℃４／ｈ；热重分析法研究了双马亚酰亚胺树脂体系的热分解反应动力学，得出体系的的热分解反应活化能为２７４．４ｋＪ／ｍｏｌ；改性双马来酰亚胺树脂体系常弯曲强度为１     

挤压态SiCw／LD2复合材料中（Ⅰ十Ⅱ）复合型疲劳裂纹的扩展

研究了挤压１９Ｖｏｌ─％ＳｉＣｗ／ＬＤ２复合材料在（Ⅰ十Ⅱ）型复合应力作用下疲劳裂纹扩展门槛值和裂纹扩展时的偏转角．用扫描电镜观察了与预制裂纹相邻的裂纹扩展区的断口形貌．结果表明，在（Ⅰ十Ⅱ）型复合应力作用下，裂纹沿最大主应力方向扩展；当△ｋⅠ和△ｋⅡ共同达到一特定值时，裂纹开始扩展；裂纹偏转角不同，扩展阻力也不同     

亚毫安室温连续工作InGaAs垂直腔面发射激光器

报道了ＩｎＧａＡｓ应变量子讲垂直腔面发射激光器（ＶＣＳＥＬ）的室温连续工作。在ＭＢＥ生长过程中利用红外高温仪测量了表观衬底热辐射振荡，实现了原位厚度监测；采用阶梯型分布布拉格反射器（ＤＢＲ）及腐蚀倒台面结构，降低了器件串联电阻。对于２×３μｍ２的台面结构ＶＣＳＥＬ，室温连续工作阈值电流一般为１．５ｍＡ，最低达到０．７ｍＡ，阈值电压为２．５伏，输出功率达到０．５ｍＷ，激射波长为０．９４ｕｍ，量子效率为１２％。     

凝胶—水热法制备纳米级钛酸钡粉末的研究

以ＴｉＣｌ４、ＢａＣｌ２．Ｈ２Ｏ、ＫＯＨ、ＮａＯＨ为原料，在ＰＨ＝１２－１３、反应温度９０－１００℃，反应时间１－２ｈ下经凝胶－水热反应合成钛酸钡，经有关厂家半半导化试验，借助于ＸＲＤ，高分辨率电子显微镜及化学分析，证明了产物达到纳米级钛酸钡水平。     

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.     

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.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to