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magnetic permeability 導磁系數,導磁性。

magnetic pickup

In the anistropic magnetic medium under the condition of magnetic permeability 11unequal to 33 , the magnetic field on axis line of current - carrying coil and that inside current - carrying solenoid can be calculated by applying biot - savart law of that medium . as the condition of their service is restricted , it is necessary to derive the magnetic field on axial line of current - carrying coil and that inside current - carrying solenod under more general condition of 11unequal to 33 . on the basis of the magnetic field on axial line of current - carrying coil in anisotropic magnetic medium under the derived condition of 11unequal to 33 , the authors obtain the magnetic field on axial line of current - carrying solenoid in anisotropic magnetic medium under general condition of 11unequal to 33 . the result shows a wider applicable coverage 利用畢奧-薩伐爾定律,并在磁導率11 = 33的條件下,可求出各向異性磁介質中載流圓線圈軸線上的磁場,以及載流直螺線管內部的磁場.顯然,其使用條件受到限制.為此,有必要導出在11 33的更一般情況下,各向異性磁介質中載流圓線圈軸線上磁場和載流直螺線管內部的磁場.在已導出11 33及各向異性磁介質中載流圓線圈軸線上磁場的基礎上,求出一般情況下各向異性磁介質中載流圓線圈軸線上的磁場,使其結果適用范圍更廣

The higher temperature , the more fe ( co ) 5 decomposed in the gaseous phase . when the temperature was raised to 150 , the thermolysis entirely happened in gaseous phase and the particles of 2 - 4um formed in long chains . with long chains broken , the plural relative permittivity ( e “ , e “ ) drop and plural magnetic permeability ( u “ , u “ ) rise 恒溫滴加法受溫度影響顯著,隨著溫度的升高,發生在氣相中的熱分解量增加; 150下fe ( co ) _ 5完全在氣相中分解,產物為2 4 m的微粒形成的鏈狀結構,這種鏈狀結構的破壞有利于復介電常數( 、 )的降低、復磁導率( 、 )的提高。

By using the larger magnetic permeability , magnetic fluid was used to improve the magnetic circuit efficiency in torque motor , enlarge the output torque and displacement of torque motor , and the output flow of servo valve . correspondingly , the ability of noise - overcoming and system damping was enhanced due to the property of magnetic fluid . as a result , the stability of servo valve and servo - control system can be improved 由于磁流體具有較大的導磁率,可提高力矩馬達磁路效率、增大力矩馬達的輸出力矩和位移,從而增加伺服閥的輸出流量;同時,利用磁流體的粘度特性,可增強力矩馬達阻尼及抗干擾能力,從而增強伺服閥及伺服控制系統的穩定性。

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 這種磁性微粒經局部注射或經動脈導管注入瘤體后,在交變磁場作用下吸收電磁波轉化為熱能使腫瘤區升溫達所需的治療溫度( 41 46 ) ,以殺死腫瘤細胞,而不含磁微粒的正常組織不受損,正逐漸成為醫學上腫瘤熱療技術的研究對象。

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 由于磁流體具有的較大磁導率和較大的磁化強度,把磁流體添加到伺服閥力矩馬達的工作氣隙中,可提高伺服閥力矩馬達的磁回路效率,增加伺服閥的阻尼,從而改善噴嘴擋板伺服閥的動態特性,抑制及消除其自激振蕩和噪聲。

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 通過鋼絲繩的疲勞實驗,本文首次研究了鋼絲繩彎曲疲勞歷程中周向漏磁通的變化規律,發現鋼絲繩的直線往復段軸向磁導率逐漸增加,且分布趨向均勻一致,而位于滑輪彎曲段鋼絲繩軸向磁導率逐漸減小,分布趨向不均勻。

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 基于磁流體所具有的特殊性質,將磁流體添加到伺服閥力矩馬達的工作間隙中,一方面磁流體被磁化后可增大銜鐵的阻尼力,減少振動;另一方面由于力矩馬達氣隙中磁導率的提高,使氣隙中的磁通量增大,力矩馬達的磁路效率和輸出扭矩將增大,因此可以提高力矩馬達的固有頻率和伺服閥的響應速度。

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 一方面可增大力矩馬達工作氣隙部分產生的阻尼,從而可以抑制射流管的自激,另一方面又可增大工作氣隙的導磁率,改善力矩馬達部分的磁路效率,從而提高伺服閥的動態響應速度。

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,這兩種反應的程度可以由兩個參數加以定量描述:代表電子對電場反應程度的電容率,以及代表電子對磁場反應程度的磁導率。

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:單項材料的規范.第5節:具備規定機械性能和磁滲透性的磁鋼片和磁鋼帶的規范

Furthermore , left - handed material ( lhm ) is a new kind of artificial material with both negative dielectric permittivity and negative magnetic permeability 左手物質是最近幾年才提出的一種全新的人工合成材料,并且由于其獨特的性質和廣闊的應用前景而倍受關注。

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.光電連接元件.試驗方法.第513部分:導磁

Magnetic materials - specification for steel sheet and strip with specified mechanical properties and magnetic permeability ; german version en 10265 : 1995 磁性材料.有規定機械性能和磁性能要求的薄鋼板和帶鋼

Standard test method for measuring relative complex permittivity and relative magnetic permeability of solid materials at microwave frequencies 微波頻率下固體材料相對復介電常數和磁導率測量標準試驗方法

The refractive index of a substance is determined by two properties known as the electrical permittivity and the magnetic permeability 物質的折射率由兩項性質決定,分別是介電常數和磁導率。

Test method for measuring relative complex permittivity and magnetic permeability of solid materials at microwave frequencies 測量微波頻率下固體材料相對復合電容率和磁導率的試驗方法

Magnetic materials - specification for steel sheet and strip with specified mechanical properties and magnetic permeability 磁性材料.具有特定的機械特性和導磁性的鋼薄板材和帶材規范

Magnetic materials . specification for steel sheet and strip with specified mechanical properties and magnetic permeability 磁性材料.鋼片和鋼帶規定的機械性能和磁導率規范

Aerospace series - elements of electrical and optical connection - test methods - part 513 : magnetic permeability 航空航天系列.光電連接件.試驗方法.第513部分:磁導率