Magnetic materials - specification for steel sheet and strip with specified mechanical properties and magnetic permeability ; german version en 10265 : 1995 磁性材料.有规定机械性能和磁性能要求的薄钢板和带钢
Aerospace series - elements of electrical and optical connection ; test methods - part 513 : magnetic permeability ; german and english version en 2591 - 513 : 2002 航空航天系列.光电连接元件.试验方法.第513部分:导磁
Furthermore , left - handed material ( lhm ) is a new kind of artificial material with both negative dielectric permittivity and negative magnetic permeability 左手物质是最近几年才提出的一种全新的人工合成材料,并且由于其独特的性质和广阔的应用前景而倍受关注。
Magnetic materials ; part 8 : specifications for individual materials ; section five : specification for steel sheet and strip with specified mechanical properties and magnetic permeability 磁性材料.第8部分:单项材料的规范.第5节:具备规定机械性能和磁渗透性的磁钢片和磁钢带的规范
Two parameters quantify the extent of these responses in a material : electrical permittivity , , or how much its electrons respond to an electric field , and magnetic permeability , , the electrons ' degree of response to a magnetic field 在材料中，这两种反应的程度可以由两个参数加以定量描述：代表电子对电场反应程度的电容率，以及代表电子对磁场反应程度的磁导率。
On one hand , it may exert damping on the armature of torque motor and overcome self - excitation of jet pipe . one the other hand , it may enlarge magnetic permeability of working clearances and improve magnetic circuit efficiency of torque motor to boost dynamic response speed of servo valve 一方面可增大力矩马达工作气隙部分产生的阻尼,从而可以抑制射流管的自激,另一方面又可增大工作气隙的导磁率,改善力矩马达部分的磁路效率,从而提高伺服阀的动态响应速度。
Based on the special property of magnetic fluid ( mf ) , we fill the magnetic fluid into the working clearances of the servo valve torque motor . one side , the magnetized magnetic fluid can exert a damping torque on the torque motor armature and reduce vibration of the armature ; on the other side , it can improve the magnetic circuit efficiency of the torque motor because of the magnetic fluid ’ s larger magnetic permeability 基于磁流体所具有的特殊性质,将磁流体添加到伺服阀力矩马达的工作间隙中,一方面磁流体被磁化后可增大衔铁的阻尼力,减少振动;另一方面由于力矩马达气隙中磁导率的提高,使气隙中的磁通量增大,力矩马达的磁路效率和输出扭矩将增大,因此可以提高力矩马达的固有频率和伺服阀的响应速度。
Through the wire rope fatigue test , for the first time this dissertation investigated the law of the axial mfl changes of wire rope . the results showed the axial magnetic permeability of the reciprocating and rectilinear part of wire rope gradually increases and its distribution tends evenness . but that of the glide wheel bending part gradually decreases and its distribution tends to unevenness 通过钢丝绳的疲劳实验，本文首次研究了钢丝绳弯曲疲劳历程中周向漏磁通的变化规律，发现钢丝绳的直线往复段轴向磁导率逐渐增加，且分布趋向均匀一致，而位于滑轮弯曲段钢丝绳轴向磁导率逐渐减小，分布趋向不均匀。
It will exert resistance and damping force to the torque motor armature , so that the dynamic performance , especially the stability , of flapper - nozzle servo - valve can be improved . the self - excited oscillations and noise can be removed . at the same time , as magnetic fluid has a higher magnetic permeability , the efficiency of torque motor magnetic circuit can be improved 由于磁流体具有的较大磁导率和较大的磁化强度,把磁流体添加到伺服阀力矩马达的工作气隙中,可提高伺服阀力矩马达的磁回路效率,增加伺服阀的阻尼,从而改善喷嘴挡板伺服阀的动态特性,抑制及消除其自激振荡和噪声。
This paper is to study the object of mn - zn ferrite powder , which is an important non - metallic magnetic materials , because of their narrow hysteresis loop , high magnetic permeability and high resistivity , high curie temperature and the low loss characteristics are widely used in many electronic industrial fields 这种磁性微粒经局部注射或经动脉导管注入瘤体后，在交变磁场作用下吸收电磁波转化为热能使肿瘤区升温达所需的治疗温度( 41 46 ) ，以杀死肿瘤细胞，而不含磁微粒的正常组织不受损，正逐渐成为医学上肿瘤热疗技术的研究对象。
