聚合物电致发光

介绍了聚合物电致发光的研究历史和用于电致发光的聚合物，分析了目前聚合物电致发光研究中存在的问题，讨论了聚合物电致发光的发展方向。     

含金属聚合物类电致发光材料研究进展

综述了含不同金属的有机聚合物电致发光材料的进展。根据不同的金属对有机金属聚合物进行分类,包括含金属铱、铂、钌、铼配体的聚合物。对这些材料的电致发光性能进行阐述,并对各类材料的研究前景进行评价。     

有机电致发光材料研究进展

本文综述了有机电致发光材料的研究进展 ,重点介绍了聚合物电致发光材料的研究 ,并对这个领域存在的问题和有机电致发光材料的应用前景作了评述     

纳米复合技术在聚合物电致发光材料与器件中的应用

纳米复合技术的问世为改善聚合物电致发光材料与器件的性能开辟了新的途径,本文论述了纳米复合技术在聚合物电致发光材料与器件中的应用及发展前景.     

白光聚合物电致发光器件及其材料的研究进展

白光聚合物电致发光器件具有低能耗、低驱动电压、绿色环保以及可制备柔性屏等诸多优异特性,被业界公认为是21世纪最具潜质和最具发展前景的高技术领域之一。此外,白光聚合物电致发光器件可通过湿法加工技术(如旋涂、丝网印刷、喷墨打印)来制作,因而其制作成本低,在显示和照明领域有着广阔的应用前景,受到人们广泛的关注。从器件和材料两个方面开展论述,简单介绍了白光聚合物电致发光的最新研究进展,并分析了实现白光聚合物电致发光器件商用化所需解决的问题。     

含吸电子基的PPV共轭聚合物的研究进展

聚苯撑乙烯类(PPVs)光电功能材料与器件因其广阔的应用前景一直受到广泛的关注。本文主要对含吸电子基团PPVs电致发光聚合物进行了综述。从聚合物吸电子基团种类的角度,介绍了PPVs的分子结构与光电性质及其在电致发光器件中的应用,并讨论了当前这些聚合物作为光电子材料存在的一些问题和发展方向。     

有机电致发光材料的新进展

介绍了有机电致发光材料的最新进展,对有机电致发光材料进行分类和评述,重点介绍载流子传输材料和发光材料(小分子发光材料,金属配合物发光材料和聚合物发光材料)的国内外研究现状,并对有机电致发光材料的应用前景进行评述.     

聚合物电致发光材料及器件

聚合物电致发光器件由于其卓越的性能,在近年来取得了飞速发展,成为科研领域的又一热点。阐述了聚合物ＥＬＤ的工作原理,器件结构、聚合物材料的种类及分子结构,综述了影响器件发光效率和寿命的因素和解决办法,介绍了聚合物电致发光材料及器件的发展现状和目前存在的问题,并对其今后的发展趋势和应用前景进行了展望。     

聚（对苯乙炔）共轭聚合物发光二极管的研究进展

聚（对苯乙炔）共轭聚合物发光二极管是以共轭聚合物承担电荷运输及电致发光的一种装置。本文对其研究进展作了综述。     

共轭导电聚合物电致发光元件的原理及进展

本文综述了共轭导电聚合物在电致发光元件中的应用,介绍了导电聚合物发光二极管和导电聚合物电化学发光电池的结构,发光原理及研究进展。     

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.……     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

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.……     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

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