纳米氧化铈在高新技术领域中的应用及其制备研究进展

根据最新文献报道，介绍了纳米CeO2的功能特性和在现代高新技术领域中的应用，综述了国内外有关纳米CeO2的多种制备方法及其特点，并对纳米CeO2研究的发展趋势提出了新的展望，以期为继续深入研究和开发纳米CeO2新型功能材料提供参考和借鉴。     

纳米有机光电功能材料

本文简要综述了有机纳米光电功能材料的研究进展。详细讨论了有机纳米薄膜的制备方法、结构表征、性能研究及应用前景。     

结构可控的纳米多孔气凝胶材料

综述了气凝胶材料的发展及潜在的应用前景。     

纳米硬质合金—21世纪的高科技产业

1 纳米硬质合金材料的兴起 纳米结构材料是80年代的重大发现。原因是材料的晶粒尺寸每下降一个数量级,强度将出现一个飞跃。这种控制结构微细化制作出来的材料既不同于长程有序的晶体,也不同于长程无序和短程有序的类气体(gas—like)固体结构。所以研究人员把它称之为“第三固态材料”。构想出这种物质新态的德国科学家是出诸于首先研制出了纳米尺寸的超微粉末,并在80年代初期,由联邦德国萨尔兰大学的Gleiter等人,用气体冷凝法制得了具有清洁表面的超微颗粒(Ultrafine Particale),在超高真空(UHV)和5GPa的压力下制得致密的、性能优良的多晶体。     

纳米与粉体材料

山东大学纳米复合发光材料器件研制成功；浙江纳米科技及新材料应用博览会胜利召开；中驰纳米铁粉生产线投产；新加坡研制出硬度仅次于钻石的纳米粉末；湖南纳米陶瓷粉末填补国内空白；台湾学研发既省钱又环保的纳米铁颗粒除污剂；河南造纸黑液碱生产碳酸钙技术通过鉴定；日本研制出新型苯酚硅石纳米复合材料。     

纳米涂料的应用及发展建议

详细介绍了纳米粒子在耐老化、抗静电、隐身、抗菌杀菌等涂料中的原理和应用 ,指出了纳米涂料研究中存在的主要问题 ,并对我国纳米涂料的发展提出建议。     

纳米技术在微波吸收材料中的应用

在概述了纳米技术的基础上，着重论述了纳米吸波材料的研究和应用的现状，同时，初步探讨了纳米吸波材料可能的吸波机制。指出将纳米技术引入吸波材料的研究开发，可以制备出宽频、高效、质轻、层薄的多频谱吸收的新型吸波材料。     

纳米结晶材料的现状和发展前景

随着高新技术领域的发展,迫切需要开发先进的多功能复合材料。纳米结晶材料就是其中之一。本文介绍了纳米结晶复合材料的性能、制造工艺、应用、现状和发展趋势。     

纳米晶体材料的合成

在材料科学和固体物理学中,早已发展和应用新的研究方法,并制备了具有新结构特征和性质的材料。金属玻璃、高温超导体或准晶体的发现代表了新结构特征和性质的材料。在纳米晶体材料的情况下,试图产生有新的原子结构和性质的固体。     

稀土纳米氧化物的应用及生产技术

稀土元素本身具有丰富的电子结构,表现出许多光、电、磁的特性。稀土纳米化后,表现出许多特性,如小尺寸效应、高比表面效应、量子效应、极强的光电磁声性质、超导性、高化学活性等,能大大提高材料的性能和功能,又开发出许多新功能材料。在光学材料、发光材料、晶体材料、磁性材料、电池材料、电子陶瓷、工程陶瓷、催化剂等高新科技领域,将发挥重要的作用。     

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.     

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...     

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.     

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.     

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