Eu3+离子作为荧光探针研究TiO2凝胶的结构变化

利用Ｅｕ＾３＋离子的＾５Ｄ０→＾７Ｆ２超灵敏跃对环境的极度敏感性,将Ｅｕ＾３＋离子引入溶胶－凝胶法制备的ＴｉＯ２凝胶玻璃中,并对Ｅｕ＾３＋离子掺入后的光谱性质进行了研究,从而表征了ＴｉＯ２凝胶形成中的结构变化过程。结果发现,随处理温度的升高,＾５Ｄ０→＾７Ｆ２跃迁强度逐渐增强,说明水分子的不断挥发、缩聚反应进行的不断完全;同时将Ａｌ＾３＋离子掺入到溶胶中,研究了其在Ｅｕ＾３＋离了的聚集所导致的荧光     

阴离子粘土LiAl2(OH)6X·2H2O(X=OH-,1/2CO32-)的离子交换特性

本文研究了阴离子粘土ＬｉＡｌ２（ＯＨ）６－Ｘ．２Ｈ２Ｏ（Ｘ＝ＯＨ＾－，１／２ＣＯ３＾２）的离子交换特性，结构分析表明，ＬｉＡｌ２－ＬＤＨ含水分隔层内的ＯＨ和ＣＯ３＾２－离子容易与酸性溶液中的Ｃｌ、ＮＯ３等离子进行交换，且保持ＬｉＡｌ２－ＬＤＨ的水滑石型层状结构不变，其中Ｃｌ－离子型表现较高的离子交换速率，在阴离子交换的同时，氢氧化以内的Ｌｉ＾＋离子也被Ｈ离子部分取代，但交换率较低，进一步讨论说明，     

K2NbOf5—MF3系玻璃的结构及电性质

研制了Ｋ２ＮｂＯＦ５－ＭＦ３（Ｍ＝Ａｌ、Ｇａ）新体系氟化物玻璃，测定了玻璃的特征温度、Ｒａｍａｎ光谱和电导率，玻璃中Ｎｂ＾５＋、Ａｌ＾３＋、Ｇａ＾３＋分别以ＮｂＯＦ＾２５、ＡｌＦ３＾５、ＧａＦ３６八面体形式存在，玻璃的电导率随ＡｌＦ３含量的增加而增加，当ＡｌＦ２含量达到３０ｍｏｌ％时，Ａｌ＾３＋除ＡｌＦ＾３６八面体外，还有ＡｌＦ４四面体结构出现，同时电导率降低，Ｆ阴离子是主要的导电离子，７５Ｋ２Ｎ     

含La^3＋的Ni—Zn铁氧体的微观结构和电磁性能

本在Ｎｉ－Ｚｎ铁氧体中掺入Ｌａ２Ｏ３后，材料的电磁性能，温度特性和微观结构所发生的变化，研究了Ｌａ＾３＋离子的掺 杂效应和作用机制。实验表明：Ｎｉ０．４１Ｚｎ０．６０Ｓｎ０．０１Ｃｕ０．０２Ｆｅ２．０４－ＸＬａＸＯ４±δ在ｘ＜０．０１０时，Ｌａ＾３＋离子能细化晶粒；ｘ０．０１０时，Ｌａ＾３＋离子使晶界模糊，晶粒尺寸增大；不同温度区域的电子激活能Ｅρ呈现出明显的差异。Ｌａ＾３＋离子对电阴率ρ的贡献     

Naβ‘’—AlO3与水的作用

本文借用了Ｘ射线衍射相分析和热分析Ｍｇ或Ｌｉ稳定的Ｎａβ－Ａｌ２Ｏ３粉体和陶瓷在不同温度条件下与水发生的作用进行了系统地研究。实验表明，在密闭的常温条件下水主要以分子形式进入Ｎａβ－Ａｌ２Ｏ３的传导层内，形成水合物Ｎａβ－Ａｌ２Ｏ３．Ｈ２Ｏ；随着温度的升高，在β－Ａｌ２Ｏ３中将发生Ｈ３Ｏ＾＋与Ｎａ＾＋之间的离子交换，生成（Ｎａ＾＋，Ｈ３Ｏ＾＋）β－Ａｌ２Ｏ３．Ｈ２Ｏ；当温度进一步提高至２５０℃时，     

溶胶—凝胶法制备Al^3＋离子掺杂型ZnO薄膜与评价

采用溶胶－凝胶（Ｓｏｌ－Ｇｅｌ）工艺在普通Ｎａ－Ｃａ－Ｓｉ玻璃基体上成功地制备出高ｃ轴择优取向性、高可见光透光率以及高电导率的Ａｌ＾３＋离子掺杂型ＺｎＯ薄膜。利用ＳＥＭ、ＸＲＤ以及ＵＶＳ光谱仪等分析方法对不同工艺下制备的薄膜进行了研究，结果显示，所制备的薄膜为纤锌矿型结构，表面均匀、致密、薄膜材料晶粒尺寸大约为５０－２００ｎｍ左右，薄膜可见光透光率最大可达９９％；对薄膜的厚度以及电学性能进行了测定     

液膜分离富集金及其微量测定

在协同流体载体（ＴＯＡ和ＰＭＢＰ）、表面活性剂（ＳＰＡＮ８０）、膜增强剂（液体石蜡）、溶剂（煤油）和内相（ＴＵ－ＨＣｌ溶液）乳状液膜体系中，在迁移条件下，１５ｍｉｎ内Ａｕ迁移率达９９．５％以上，而许多常见的离子则不能通过液膜迁移，只有Ａｕ才能从含有ΣＲＥ＾３＋、Ａｇ＾＋、Ｐｄ＾２＋、Ｐｔ４＾＋、Ｒｈ＾３＋、Ｃｕ＾２＋、Ｆｅ＾３＋、Ａｌ＾３＋、Ｐｂ２＾＋、Ｚｎ＾２＋、Ｎｉ＾２＋、Ｍｏ＾６＋、Ｗ＾６＋     

B3+,Zn2+掺杂与SiO2薄膜驻极体的改性

用粉体制备和高温熔凝工艺在ｎ〈１１１〉型单晶硅基片上制备了非晶态ＳｉＯ２－ＺｎＯ－Ｂ２Ｏ３复合膜驻极体。实现对ＳｉＯ２薄膜驻极体的改性,恒栅压电晕充电、等温表面电位衰减及热刺激放电（ｔｈｅｒｍａｌｌｙ ｓｔｉｍｕｌａｔｅｄ ｄｉｓｃｈａｒｇｅｄ,ＴＳＤ）实验表明,Ｂ＾３＋、Ｚｎ＾２＋的掺杂对ＳｉＯ２薄膜驻极体的电荷动态特性有较大影响：ＴＳＤ放电电流峰稳定于ｔ＝２３８℃处,峰位不随充电温度和充电电压     

掺杂离子在LHPG单晶光纤中的分布

用电子能量色散谱（ＥＤＳ）分析了Ｎｄ＾３＾＋，Ｅｒ＾３＾＋和Ｃｒ＾３＾＋等掺杂离子在ＹＡＧ单晶光纤中的分布，实验发现：掺杂离子的分凝系数不同，其分布规律也不同，根据晶体的溶液生长理论，导出了掺杂离子分布方程，它与实验结果相符较好。     

Eu2+在多铝酸钠体系中的发光

应用高温固相法合成了Ｎａ的多铝酸盐,并研究了Ｅｕ＾２＋在体系中的发光性能,结果表明,Ｎａ１＋ｘＭｇＡｌ１１－ｘＯ１７体系在整个组成范围内保持Ｎａ的β－Ａｌ２Ｏ３结构不变,而对于Ｎａ１．６７－２ｘＢａｘＡｌ１０．３３Ｏ１７体系,在ｘ＝０．３０附近体系结构发生转变,ｘ〈０．３０,体系形成Ｎ的β－Ａｌ２Ｏ３结构的固溶体,ｘ〉０．３０,体系形成Ｂａ的β－Ａｌ２Ｏ３结构的有序体;与体系组成的和结构的变化相对     

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.