气动力压敏漆发光氧猝灭影响因素的研究

以钌配合物为探针分子,分散于经溶胶－凝胶法制备的ＳｉＯ２基质中制得了性能优异的对空气压力变化敏感的压敏漆。研究了探针分子的选择、溶胶－凝胶ＳｉＯ２基质的制备条件,反射衬底以及测量温度的选择对压敏漆发光氧猝灭的影响。表征了压敏漆的微观他微观结构与发光和氧猝灭的关系,给出了压敏漆的微观结构模型。     

聚丙烯酸酯乳液型压敏胶在包装中的应用及发展

压敏胶粘剂是一类无需借助于溶剂或热，只需施加轻度压力，即可与被粘物粘合牢固的胶粘剂，通常在粘结过程中对压力是敏感的，而粘结面形成后，压敏胶对压力不敏感。主要用于制造压敏胶带、胶粘片和压敏标签等。其特点是粘之容易，揭之不难，剥而不损，在较长时间内胶层不会干固，所以压敏胶也称为不干胶。     

风洞分布测压试验校准技术发展现状

调研了目前国内外表面压力分布测试试验校准技术,分别总结了风洞试验中稳态压力分布和脉动压力分布的测试及校准现状。选取分布测压技术中具有代表性的压力扫描阀及压敏漆(PSP)测试校准技术展开论述,介绍了包括校准原理、试验流程及校准溯源链等校准试验的关键要素。通过对比国内外风洞测压试验校准技术现状,分析了我国测压校准体系存在的问题及相关解决方法,提出了我国风洞压力分布测试校准技术的发展方向。     

环氧粉末包封的ZnO压敏电阻器的湿热劣化规律研究

研究了３种湿热方式作用下ＺｎＯ压敏电阻器的性能劣化规律，以及环氧粉末的固化条件的影响。分析与讨论了湿热联合作用下ＺｎＯ压敏电阻器受潮机理，以及温度和压力在湿热劣化过程中的加速作用。     

轴向压力作用下钢渣混凝土的压敏性研究

在不同加载速率、突然加载和卸载以及三向约束等加载条件下,钢渣混凝土具有良好的导电性和压敏性;随着钢渣掺量的增加,钢渣混凝土的压敏效应更加明显;施加压力较小时,电阻率随压力增大而迅速降低;压力增大到一定程度后,电阻率下降十分缓慢;压力达到极限荷载时,电阻率迅速升高;受到三向约束时,钢渣混凝土仍然具有压敏特性,相对于单轴受?其压力敏感性较低.     

钢渣混凝土压敏性研究及机理分析

为了确定钢渣混凝土是否具有感知应力的功能,研究了钢渣混凝土在不同荷载条件下的电阻变化规律,即压敏性.通过模拟试验测试了不同加载速率、循环加载、突然加载和卸载等加载条件下钢渣混凝土的压敏性.结果表明,随着钢渣掺量的增加,钢渣混凝土的压敏效应更加明显;压力较小时,电阻率随压力增大而迅速降低;压力增大到一定程度后,电阻率下降十分缓慢;压力达到极限荷载时,电阻率迅速升高;在循环加载情况下,第一次加载循环时钢渣混凝土电阻变化率高于第二次加载循环时的变化率.钢渣混凝土成本很低,制备方法简单,与碳纤维增强水泥一样具有良好的压敏性,因此具有较好的应用前景.     

高压力传感器压头封装螺纹结构分析

半导体压敏材料试制高压力传感器，采用螺纹封装压头时，由于螺牙的塑性变形与长期重载下材料蠕变，将引起传感器输出电信号曲线的平飘与蠕变。分析典型的均载螺纹基础上，本文提出了均载效果更好的螺纹联接结构，分析与说明其均载原理。实际应用中提高了传感器的输出精度与稳定性。     

高压力传感器压头封装螺纹结构分析

半导体压敏材料试制高压力传感器，采用螺纹封装压头时，由于螺牙的塑性变形与长期重载下材料蠕变，将引起传感器输出电信号曲线的平飘与蠕变。分析典型的均载螺纹基础上，本文提出了均载效果更好的螺纹联接结构，分析与说明了其均载原理。实际应用中提高了传感器的输出精度与稳定性。     

CeO2掺杂氧化锌压敏阀片压敏电位梯度与显微组织的研究

采用添加微量CeO2的方法，提高氧化锌压敏阀片的电位梯度，使之具有优良的综合性能。同时研究了微量CeO2添加剂对氧化锌压敏电阻片的压敏电位梯度的影响，并通过SEM测试手段对其微观组织结构进行了分析研究，从理论上探讨了CeO2影响氧化锌压敏阀片压敏电位梯度与组织的机理。研究结果表明，在0～0．06％（摩尔分数）成分范围内，随着CeO2含量的增加，氧化锌压敏阀片的压敏电位梯度明显提高；当CeO2含量超过0．06％（摩尔分数）时，随其含量的增加，氧化锌压敏阀片的压敏电位梯度又呈降低趋势。其原因是CeO2加入到氧化锌压敏阀片中，以原相形式独立存在的CeO2相钉扎在晶界，阻碍晶界运动，抑制了ZnO晶粒的生长；另一方面，CeO2添加剂在陶瓷烧结过程中使ZnO晶体的自由电子浓度增大，填隙锌离子Zni的总浓度下降，因而填隙锌离子的传质能力下降，抑制了ZnO晶粒的生长，因而晶粒尺寸随CeO2的添加而下降，压敏电位梯度显著提高。     

钛的复合掺杂对ZnO压敏电阻器性能的影响

本文研究了钛以不同的复合物加入时，对ZnO压敏电阻器电性能的影响。实验表明，不同的复合物掺杂对ZnO压敏电阻器电性能影响规律不同，当钛的复合物在压敏电阻器烧结过程中有利于钛溶于晶界处的富铋液相中时，则有利于晶粒的生长。     

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.