UFO-3-500 Portable Ultraviolet Source and Kit for Magnetoluminescent Testing

Application domains, features, and basic technical characteristics of a portable ultraviolet source and kit for magnetoluminescent testing are discussed.     

A Pulse Coherent Spectrometer of Nuclear Magnetic Resonance for Magnetic Materials

A pulse coherent automated nuclear magnetic resonance spectrometer designed to study samples of magnetically ordered materials in the frequency range 20–200 MHz is described. The spectrometer provides the programming of time and frequency parameters of pulse sequences and allows phase-sensitive detection of echo signals with their subsequent representation in digital form. Experimentally observed nuclear spin echo signals in an isotope-enriched YIG film are presented.     

材料磁声发射技术研究

对几种常用钢材的磁声发射（ＭＡＥ）特性进行了测试,研究了材料的化学成分、显微组织及应力状态对材料磁声发射的影响,从而进一步证实,磁声发射技术作为无损检测材料的一种新方法是可行的。     

研磨硬脆材料的金刚石磁性磨料制备

运用化学复合镀法制备了用于硬脆材料研磨的金刚石磁性磨料。采用单因素实验方法研究了铁粉的装载量、金刚石磨粒的浓度以及机械搅拌的速度对金刚石相对含量的影响。通过石英玻璃的平面磁控研磨加工实验测试了制备的金刚石磁性磨料的研磨性能。结果表明,当铁粉的装载量为6 g/L,金刚石磨粒浓度为6 g/L,搅拌速度为300 r/min时,金刚石相对含量较高。金刚石磨粒在Ni-P合金镀层中粘结牢固,分散均匀。通过磁控研磨加工,石英玻璃的表面粗糙度快速地从0.709μm降低到0.138μm,证明了制备的金刚石磁性磨料具有较好的研磨性能。     

稀土永磁材料力学性能改善方法及加工方法的研究进展

稀土永磁材料因其优异的磁性能在传统工业、风力发电和新能源汽车等领域得到广泛应用.但是,稀土永磁材料中金属间化合物的脆性大,导致该材料的力学性能和加工性能差,从而限制了其应用范围.总结了稀土永磁材料塑韧性差的原因和断裂机理,重点阐述了近年来提高其力学性能的方法,主要包括晶粒尺寸及分布优化、基体相强韧化、晶界强韧化,以及降...     

水磁微特电机及永磁材料应用

针对永磁微特电机的分类、使用特点及对永磁材料的要求,介绍了铁氧体永磁材料的性能和锶铁氧体在飞轮发电机中的应用,并给出了磁钢尺寸的设计方法.     

铁磁材料磁记忆检测技术的研究现状

金属磁记忆检测技术作为无损检测领域的新兴学科，可以对铁磁材料构件的疲劳失效进行有效的早期诊断。在铁磁性装备部件的定寿、延寿工作中有着广阔的应用前景。综述了金属磁记忆检测技术的基本概念、检测原理及该技术的独特优点，并介绍了目前市场上已有的多种磁记忆检测仪器。分析了该技术机理的研究现状及应用情况，提出了目前存在的问题和未来发展。     

A Torsion Balance for Studying Anisotropic Magnetic Properties of Superconducting Materials

A low-temperature torsion balance for studying magnetic properties of superconductors is described. The device can operate in the modes of the rotation or vibration of an axisymmetric superconducting sample in an external magnetic field. The balance provides for the measurement of a torque of 10^–8 –1 N·m applied to the sample. The device is highly sensitive to frozen magnetic fluxes even of the order of magnitude of the geomagnetic field (H 0.5 Oe). To eliminate the effect of frozen magnetic fluxes, two-layer Permalloy shields providing for the cooling of the sample in the field H < 10^–3 Oe are used. The capabilities of the developed method for studying critical parameters and the anisotropic magnetic properties of superconductors are described.     

Automatic Complex for a Study of the Characteristics of Hard Magnetic Materials

An automatic setup for a study of the magnetic characteristics of hexagonal oxide ferrimagnetic materials, which uses a technique of determining anisotropy fields by the singular-point detected method, is described.     

Nd-Fe-B 永磁体材料的金刚石工具套料加工

对Nd-Fe-B烧结永磁体材料的金刚石工具套料钻削加工进行了比较详细的研究。实验结果表明,在选择合适的进给压力和充分冷却的条件下,应尽量提高金刚石工具的转速,以便获得较高的加工效率、加工精度和加工表面质量。如果套料加工的工件厚度较大,必须认真考虑排屑问题。     

Nd-Fe-B烧结永磁体材料的超声加工机理

对Nd-Fe-B烧结永磁体材料超声振动加工过程中的材料去处机理进行了理论研究,研究结果对实际生产具有一定的指导作用,并进行了加工实验研究。     

综合料场堆取料机无线通讯系统的开发与应用

介绍莱钢银前综合料场的工艺流程及控制功能,并针对以往堆取料机可移动设备和地面控制系统间的滑触线通讯的不可靠问题进行研究。通过分析无线通讯的原理和优势,提出增设数传电台,采用无线通讯实现堆取料机车栽和地面控制系统的数据通讯。     

A Setup for Measuring Magnetic Properties of Magnetically Soft Materials in the Pulsed Remagnetization Regime

The modern technological level and trends of the development of magnetic techniques for measuring properties of magnetically soft materials (MSM) used in setups in whose cores magnetization is reversed in the pulsed regime have briefly been reviewed. A setup for measuring magnetic properties of MSM in a pulsed remagnetization regime for the pulse duration of 1–100 s and the magnetic flux of 10^–8–10^–5 Wb is described.     

Magnetic Acoustic Emission in Ferromagnetic Materials. 3: Effect of Structural Changes on Magnetic Acoustic Emission (Review Article)

This part of the review is devoted to effects of structural changes in multiply alloyed ferromagnetic materials on parameters of magnetoelastic acoustic emission.     

磁强计在探索高温磁制冷材料中的应用

本文在简介高温磁制冷材料的发展与应用的基础上,结合实例介绍了磁强计在这一领域中的应用。     

基于MagNet的磁力耦合调速器磁路机构的参数优化

基于Magnet有限元分析软件,建立了磁力耦合调速器磁路机构有限元模型,对磁力耦合调速器的磁路参机构参数进行优化,对优化后的模型进行了仿真分析。基于优化参数设计制作了磁力耦合调速器样机,对样机空载和负荷运行性能验证,验证了磁路设计的合理性。研究结果表明,样机输出转矩和输出转速与仿真计算结果相符,满足设计要求,具有一定的工程应用参考价值。     

Method for Determination of Magnetic Susceptibility and Principal Axes of Anisotropic Materials in Linear Regions of Their Characteristics

A method has been suggested for generating a homogeneous magnetization in a sample and determining its magnetic characteristics.     

Feasibility of Testing Paramagnetic Materials by Magnetic Resonance Methods: I. Method of Low-Resolution Proton Magnetic Resonance

The paper reports on underlying principles of a semiempirical method developed by constructing a generalized correlation function for interacting magnetic moments of protons. The method enables one to calculate shapes of magnetic resonance lines that are intermediate between the Lorentzian and Gaussian profiles, which is typical of real systems containing protons. The method is a more efficient practical implementation of the proton resonance technique, which can be applied to the testing and diagnostics of paramagnetic materials and bodies.     

推进科技条件资源管理首都重大科技创新工程之一北京科技条件市场开业林文漪副市长出席开业典礼并作重要讲话

[本刊讯] 北京科技条件市场经过近半年的筹备于7月25日正式开业,北京市科委主任范伯元主持了开业仪式,北京市副市长林文漪、科技部条财司副司长吴泊尔、中科院计财局局长许平等领导出席并发表了讲话.科技部、教育部、中科院、国家自然基金会、北京市各委办局、科技园区、大专院校等有关方面的代表参加了开业仪式.参加开业仪式的还有著名科学家王大珩先生、周同惠先生、国内外著名科学仪器公司的代表、国家重点实验室的专家学者们及新闻界人士.     

电磁推力轴承磁场的有限元计算及漏磁分析

电磁推力轴承中转轴内存在的漏磁现象对轴承的工作性能有较大的影响。用有限元方法对上述现象进行了计算分析,发现漏磁引起轴承的轴向推力加大。随着定子铁心和转轴之间的气隙加大,漏磁减少,轴向电磁力反而逐渐变小。有关的机理分析表明这种现象的存在是合理的。在此基础上,提出有关的设计建议。