掺Ce稀土铁石榴石单晶的制备及磁光性能

采用改进的助熔刑法生长块状Ｃｅ：ＹＩＧ单晶,分析了它的晶体结构、测试了在近红外波段的磁光性能Ｃｅ~３＋掺入铁石榴石十二面体位极大地增强了材料的法拉第旋转,在λ＝０．７８μｍ时,Ｙ３Ｆｅ５Ｏ１２晶体中每一个 Ｃｅ~３＋替代 Ｙ~３＋;其Ｆ的增加量（ｄθＦ,／ｄｘ）达到 ０．６×１０~４ｄｅｇ／ｃｍ,比同量 Ｂｉ~３＋替代时晶体Ｆ的增加量高２倍,在稀土铁石榴石中掺入Ｙｂ和Ｅｕ;由于其有弱的还原性,能抑制Ｃｅ~４的形成,增加 Ｃｅ~（３＋）离子的替代量。     

用于光纤电流传感器的BiGd∶YIG和Gd∶YIG磁光单晶的生长及性能研究

本文用助溶剂熔盐法生长了具有高法拉第旋转角、低温度灵敏性的磁光石榴石单晶：（ＹＢｉＧｄ）３Ｆｅ５Ｏ１２（ＢｉＧｄ∶ＹＩＧ）和（ＹＧｄ）３Ｆｅ５Ｏ１２（Ｇｄ∶ＹＩＧ）。对所生长的单晶,经Ｘ射线和扫描电镜能谱测试,分析了结构和晶体组成。测试光吸收系数和比法拉第旋转角等磁光性能,并用分子场理论分析了晶体的饱和磁化场和法拉第旋转角随温度变化的关系。结果表明ＢｉＧｄ∶ＹＩＧ非常适合光纤电流传感系统等一些磁光器件的应用     

用于光纤电流传感器的BiGd：YIG和Gd：YIG激光单晶的生长及性能 …

本文用助溶剂熔盐法生长了具有高法拉第旋转角,低温度灵敏性的磁光石榴石单晶：（ＹＢｉＧｄ）３Ｆｅ５Ｏ１２（ＢｉＧｄ：ＹＩＧ）和（ＹＧｄ）３Ｆｅ５Ｏ１２（Ｇｄ：ＹＩＧ）。     

无Co混合导电型陶瓷透氧膜的制备和性质研究

首次合成了Ｓｒ１０－ｎ／２ＢｉｎＦｅ２０Ｏｍ（ｎ＝２，４，６，８，１０等）系列氧化物透氧膜，它们具有较高的透氧能力，其中，样品ｎ＝１０在１１００Ｋ时的透氧率为０．９０ｍｌ（ＳＴＤ）／（ｃｍ２·ｍｉｎ），比Ｓｒ１－ｘＢｉｘＦｅＯ３高约两倍．Ｓｒ１－ｘＢｉｘＦｅＯ３（ｘ＝０．１，０．３，０．５）系列的透氧率随Ｂｉ含量增加而增大．通过两个系列氧化物的ＸＲＤ和化学组成的对比，发现Ｂｉ离子含量和晶格空位浓度对透氧能力大小起决定性作用．     

溶胶—凝胶技术制备Bi4Ti3O12铁电薄膜的研究

采用溶胶－凝胶技术在Ｓｉ单晶基片上制备了具有层状钙钛矿型结构的Ｂｉ４Ｔｉ３Ｏ１２ｘ铁电薄膜，讨论了回火温度与时间对薄膜结构的影响，Ｘ射线衍射分析表明，经７００℃和７００℃以上温度回火的薄膜为具有层状钙矿型结构的Ｂｉ４Ｔｉ３Ｏ１２多晶薄膜，该薄膜的电滞回线测试呈出剩余极化强度Ｐｒ＝５μＣ／ｃｍ＾２，矫顽场Ｅｃ＝１３０ｋＶ／ｃｍ。     

冷轧态SiCp/LY12复合材料超塑性及变形机制

研究了冷轧态ＳｉＣ颗粒（ｄｐ＝１０μｍ）增强ＬＹ１２复合材料（ＳｉＣｐ／ＬＹ１２）的超塑性,着重探讨了变形机制。研究表明：（１）在温度Ｔ＝８０３Ｋ（比熔点高２６Ｋ）,初始应变速度ε０＝４．８×１０＾－４ｓ＾－１时,应变速度敏感系数ｍ值为０．４９,延伸率达２４０％;（２）超塑性变形后的晶粒尺寸约为１０μｍ;（３）该事材料超塑性变形的主要机制是晶界液相和基体中动态回复调节的但却受界面液相和界面扩散流释     

立方A^4＋M^5＋2O7型化合物与新型负热膨胀材料

概述了立方Ａ＾４＋Ｍ＾５＋２Ｏ７型化合物的结构特点，讨论了ＡＶ２－ｘＰｘＯ７型（Ａ＝Ｚｒ或Ｈｆ；ｘ＝０．１～１．２）及其部分取代的Ａ＾４＋１－ｙＢ＾４＋ｙＶ２－ｘＰｘＯ７型（Ｂ＝Ｔｉ，Ｃｅ，Ｔｈ，Ｕ，Ｍｏ，Ｐｔ，Ｐｂ，Ｓｎ，Ｇｅ或Ｓｉ；ｙ＝０．１～０．４）和Ａ＾４＋１－ｙＣ＾１＋ｙＤ＾３＋ｙＶ２－ｘＰｘＯ７型（Ｃ为碱金属元素，Ｄ为稀土金属元素）材料的负热膨胀性能。     

掺铋钇铁石榴石光吸收谱的理论计算

利用ＤＶ－Ｘα方法分别计算了Ｆｅ＾３＋Ｏ＾２－６和Ｆｅ＾３＋Ｏ＾２－４原子族的能态密度和能级，在能级图的基础上，给出了０．５－０．９μｍ（１．６ｅｒ－２．３ｅｖ）范围内Ｂｉ－ＹＩＧ与吸收有关的跃迁能级，振子强度和跃迁线宽，并计算了相应的吸收谱，理论计算与实验结果符合较好。     

八种新功能晶体的比热及其与相变掺杂物关系的实验研究

本文对八种新型功能晶体Ｌｉ２Ｂ４Ｏ７、Ｂｉ１２ＴｉＯ２０、Ｂｉ１２ＧｅＯ２０、Ｂｉ１２ＧｅＯ２０、Ｂｉ４Ｇｅ３Ｏ１２、Ｓｒ１－ｘＢａｘＮｂ２Ｏ６（ｘ＝０．３３，０．４８）、ＬｉＴａＯ３等在１３０～９７３Ｋ范围内的比热行为及其与相变、组分之间的关系进行了实验研究，给出了比热的多项式拟合方程，并与用纽曼－卡普定律及用Ｗｉｋｅｌｍａｎｎ经验方程的比热计算值作了对比，为晶体比热的估算提供了依据和方法。     

300KeV氩离子辐照非晶态合金两代表面发泡形成

室温下，用３００ＫｅＶ氩离子辐照了非晶态合金Ｆｅ４０Ｎｉ４０Ｐ１２Ｂ８、Ｆｅ４０Ｎｉ４０Ｓｉ１２Ｂ８、Ｆｅ３９Ｎｉ３９Ｖ２Ｓｉ１２Ｂ８和Ｆｅ３９Ｎｉ３９Ｍｏ２Ｓｉ１２Ｂ３，研究了表面形貌随剂量的演变。在所研究的１．０×１０＾１７到５．０×１０＾１７离子／ｃｍ＾２的剂量范围，表面形貌以发泡形貌为主，并观测到了两代表面发泡的形成，第二代表面发泡的直径与第一代发泡相比，明显减小。油射自始至终影响着表面形     

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.