软磁薄带巨磁阻抗效应的数值分析

利用磁畴壁移动模型以纳米晶软磁合金Ｆｅ７３．５Ｃｕ１Ｎｂ３Ｓｉ１３．５Ｂ９为例对软磁薄带中的巨磁阻抗效应进行了数值分析，结果发现不同的磁导率机制并不能显著发迹巨巨磁阻抗效的大小仅由磁导率对外加磁场的敏感性决定，从趋肤深度的角度讨论了巨磁阻抗效应的频率特性。     

Co—Fe—Si—B非晶丝的巨磁阻抗效应研究

用旋转水中纺丝法制成几种不同直径的（Ｃｏ０．９４Ｆｅ０．０６）７２．５Ｓｉ１２．５Ｂ１５非晶丝,对丝进行张力退火后,测试了非晶丝热处理前后的磁阻抗性能。结果表明制成的非晶丝具有明显的巨磁阻抗效应,且巨磁阻抗效应随电流频率不同而表现出正磁阻抗和负磁阻抗两种规律。张力退火对正磁阻抗效应有明显改善,而且对直径小的试样,阻抗对轴向外磁场变化的灵敏度更高。实验得到的最大灵敏度为１２４％／Ｏｅ。     

铁基巨磁阻抗薄膜的研究

溅射方法制备的非晶Ｆｅ６８Ｃｕ０．５Ｃｒ４Ｖ５Ｓｉ１３．５Ｂ９薄膜,通过适宜的退火处理得到具有纳米ａ－Ｆｅ（Ｓｉ）和非晶母相的混合结构和最佳的软磁性能,相应的巨磁阻抗值最高可达７２％。本着重研究了热处理条件、薄膜组织结构、较磁性能以及驱动电流频率对Ｆｅ６８Ｃｕ０．５Ｃｒ４Ｓｉ１３．５Ｂ９薄膜磁致阻抗的影响。     

应力退火的Fe基纳米微晶带纵向驱动巨磁阻抗效应的研究

测定了不同张应力退火生成的Ｆｅ７３Ｃｕ１Ｎｂ１．５Ｖ２Ｓｉ１３．５Ｂ９纳米微晶带在高频纵向驱动堤下的巨磁阻抗效应。从相们随外磁场的外磁堤的变化规律中得出,与磁损耗相应的α”随外磁堤的变化是引起高频纵向驱动巨磁阻抗效应的重要原因。并由相位随堤变化的最小值可以很确定出材料的横向磁各向异性ＨＫ的大小,这为测量材料的磁各向异性堤提供了一个亲折方法。     

非晶FeSiB薄膜中的巨磁阻抗效应

采用射频溅射法在三组不同溅射条件下制备了ＦｅＳｉＢ薄膜。测量了溅射薄的磁滞回线，并利用ＨＰ４１９４Ａ阻抗分析仪，在１－４０ＨＭｚ频率范围内研究了样品的巨磁阻抗效应。     

Cu对NiFe／Cu／NiFe层状薄膜的巨磁阻抗效应影响的研究

用直流磁控溅射方法制备了ＮｉＦｅ／Ｃｕ／ｎｉＦｅ层状薄膜,研究了Ｃｕ膜宽度对ＮｉＦｅ／Ｃｕ／ｎｉＦｅ层状薄膜的巨磁阻抗效应的影响,结果表明,层状薄膜的巨磁阻抗疚随Ｃｕ膜宽度发生振荡现象,并提出了一个等效电路模型直观地解释了层状薄膜增强巨磁阻抗效应的机理。     

用于氟化镓铟高数值孔径光纤的氟磷酸盐和氟锆酸盐和氟锆酸盐包 …

为了得到用于１．３μｍ光通讯窗口掺镨化镓铟（ＰＧＩＣＥ）高数值孔光纤，本文报道以ＺｒＦ４－ＢａＦ２－ＬａＦ３－ＡｌＦ３－Ｎａ（Ｌｉ）Ｆ－ＰｂＦ２（ＺＢＬＡＮ（Ｌｉ）Ｐｂ）和ＮａＰＯ３－ＢａＦ２－ＺｎＦ２－ＰｂＦ２（ＦＰＧ）玻璃作为包层材料，研究了芯和包层玻璃在物理性质和化学组分上的匹配性，差热扫描（ＤＳＣ）和电镜（ＳＥＭ）分析表明ＰＧＩＣＺ／ＺＢＬＡＮ（Ｌｉ）Ｐｂ虽在物理性质上匹配，但在化学组分不     

非晶态合金丝巨应力电阻效应的研究

研究了具有近零磁致伸缩系数Ｆｅ４．３５Ｃｏ６８．１５Ｓｉ１２．５Ｂ１５晶态合金丝在外加压应力作用下显示的巨应力电阻抗效应。比较了Ｆｅ４．３５Ｃｏ６８．１５Ｓｉ１２．５Ｂ１５非晶材料及具有大磁致伸缩系数的Ｆｅ７７．５Ｓｉ７．５Ｂ１５非晶材料在弯曲应力作用下显示的应力电阻抗效应的异同。仔细胞研究了结果非晶丝两端的电压信号峰峰值与外力,驱动电流Ｉｍｓ及频率ｆ的     

应力作用下电流退火对钴基非晶薄带的巨磁阻抗效应的影响研究

采用应力作用下的直流电流退火处理Co68.2Fe2.3Mo2Si12.5B15非晶薄带，详细讨论了应力退火前后Co基薄带的巨磁阻抗效应的变化，以及退火时间对巨磁阻抗效应的影响，研究表明：应力作用下的电流退火有利于巨磁阻抗效应的提高，并可以通过控制退火时间控制阻抗与外场变化关系曲线形状。     

微晶钕铁硼真空快淬设备及工艺研究

本文结合国内外钕铁硼永磁材料的开发应用状况，采用熔体旋转萃取法，设计、制造并调试完成了一台 ＶＲＱ－１０Ｔ型真空快淬设备，合理地选择了工艺参数，得到了厚为 ２０～５０μｍ的 ＮｄＦｅＢ薄带，制备了最大磁能积（ＢＨ）ｍａｘ＝５１．７ｋＪ／ｍ３的ＮｄＦｅＢ粘结磁体．本文介绍了该设备各部件的结构特点，并通过对退磁曲线的测试和对Ｘ射线衍射图样的观察，分析了影响微晶 ＮｄＦｅＢ成带情况及粘结 ＮｄＦｅＢ磁体性能的各种因素。最后，我们得到结论．转轮表面线速度是影响磁性能的主要因素，微晶结构的ＮｄＦｅＢ粘结磁体性能最佳．     

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