( 2 ) the shear stresses vary as the relative permeability of the matrix fluids , the volume fraction of particles , and the square of the particles " magnetization . the shear stresses increase with the external magnetic field , but have saturation values 磁流变液的剪切应力随基液磁导率、磁性固体粒子浓度呈线性正比关系，随磁性固体粒子的磁化强度呈平方正比关系，随着外加磁场的增大而迅速增大。
2 . sr will substitute for ba the quantity increase , the material resonance frequency increases , the will change slightly ; when few zn substitutes for co , with the zn increase , resonance frequency will cut down , the increases , the q value will drop 2sr取代ba的量增加,材料的截止频率将增大,复数磁导率将变小;当少量zn取代co时,随着zn取代量的增加,截止频率向低频移动,磁导率增加, q值总体下降。
Absorbing properties of single layer absorbing materials are determined by complex permittivity , complex permeability , thickness , frequency and so on . the external electromagnetic ( em ) parameters of materials lie on ingredients " content and em parameters 单层吸波材料的吸波性能主要取决于材料的复介电常数、复磁导率、材料厚度及使用频率等因素，而该层的宏观电磁参数又取决于各组分的电磁参数及其含量。
Compared with traditional silicon steel , fe - 6 . 5wt % si in theory is considered as an excellent property soft magnetism alloy . it has such excellent soft magnetism properties as higher permeability higher saturation magnetic induction near - zero magnetostriction and low core loss Fe - 6 . 5wt si硅钢是一种性能优异的软磁合金，与传统硅钢材料相比，它具有高磁导率、高饱和磁感应强度、低磁致伸缩和低铁损等更优异的性能。
Having investigated composites of ep coating ultramicro iron using atpu as surface agent , results showed that with increasing amount of atpu , density , complex permittivity ( ) and complex permeability ( ) of composites decreased , and retentivity and coercivity increased 用atpu作表面活性剂制备核壳结构复合粒子时，随着复合时atpu用量的增加，复合粒子的密度、复介电常数( )和复磁导率( )逐渐减小，剩磁与矫顽力逐渐增大。
Removing partial surfactant covering on nanoparticles reduce the permittivity of particles remarkably , but little effect on the permeability ; decreasing the aliphatic chain length of the surfactant can improve both permittivity and permeability of particles evidently . 2 脱除部分包覆在纳米粒子表面的表面活性剂，可以明显降低铁纳米粒子的介电常数而对磁导率影响不大；减小纳米粒子表面的表面活性剂脂肪链链长使粒子的介电常数和磁导率均有大幅提高。
The result shows that with the addition of rare earth elements , ultrasonic irradiation and magnetic field , the chemical component , surface configuration , microstructure and properties of electroless co - ni - b and co - fe - b alloy changes remarkably . such kind of change can be described as the followings . firstly the depositing speed of electroless alloy bath is raised while the polarizability and cathodic overpotential are reduced ; secondly the surface quality of the alloy coating and adhesion of the coating and matrix are improved ; thirdly in the coatings the content of the elements in the transient group increases , but the content of cobalt decreased ; fourthly the amorphous structure is transformed to microcrystal structure and polycrystal structure ; fifthly the microhardness and wear resistance of the coating are enhanced ; sixthly coercitive force is reduced , and magnetoconductivity of the coating is increased ; lastly the magnetic intensity of the coating increases with the addition of energy and light rare earth elements such as ce , la and decreases with the addition of heavy rare earth elements such as y . on the other side , when the alloy coatings passes through the heat treatment under the temperature of 250 or 500 , their properties will change 结果显示化学沉积co - ni - b 、 co - fe - b工艺在稀土元素( ce 、 la 、 y 、 dy ) 、能量(超声波、磁场)介入后，沉积过程、合金成分、镀层形貌结构和性能都有显著变化，表现在：镀液的阴极极化过电位和极化度降低，沉积速度提高；镀层的结合力、表面质量改善；镀层中过渡族元素的含量增加，轻元素硼的含量降低，同时证实了稀土元素与过渡族元素共沉积的可能性；镀层的显微结构由非晶态向微晶和多晶态转变；镀层的显微硬度与耐磨性提高，力学性能优化；镀层的矫顽力降低；磁导率提高；镀层的磁化强度在能量(超声波、磁场)和轻稀土元素ce 、 la介入后提高，重稀土元素y介入后降低。
