Iee is activating the formation and development of industry of applied magnetic technology, the industrialization of applied superconducting technology and the rising of substitute energy resources and related industry 电工研究所正在推进磁技术应用产业的形成和发展、应用超导技术的产业化和替代能源技术及产业的成长。
Based on model experiment and practical application of magnetic method for detection of underground cultra1 relics, this paper systematically describes the mechanism, technique, character and effects of applying magnetic method to the detection of underground cultural relics 摘要对地下文物的磁性通过模拟实验和实际应用研究,系统地阐明了应用磁法探测地下文物的机制、方法、特点和效果。
Multiferroelectric magnetoelectri materials have a spontaneous polarization that can be reoriented by an applied electric field, a spontaneous magnetization that can be reoriented by an applied magnetic field . these materials have been exploited as transducer, waveguides, switches, phase inverters, modulators, etc . which also find a lot of technological applications in radioelectronics, optoelectronics, microwave electronics in instrumentation 这类材料同时具有铁电和铁磁材料的性能可以应用到传感器,波导器件,转换器,相位倒相器,变频器,调节器等,在无线电电子学,光电子学,微波电子学等领域的发展具有重要意义。
The main research aspects are as follows : the method of ac transport losses measurement in ac applied magnetic field was investigated . upon the analysis of ac loss measurement, a method to measure ac transport losses in ac applied field was proposed by use of double " 8 " shape coils . a programme controlled system was set up to measure ac losses of hts tapes and coils, which can ensure the experiment data needed by theoretical analysis and verification 主要包括:在实验方面,探讨了交流背景磁场下高温超导带材的交流传输损耗的测量问题,通过对交流损耗测量的理论分析,提出了采用双“8”字形电势引线测量交流背景磁场下高温超导带材交流传输损耗的方法;建立了超导带材短样及线圈交流损耗的电测量系统;从而为交流损耗的研究提供实验数据与理论检验标准。
Beside the cmr effect, these materials also exhibit intriguing physical properties such as insulator-metal and / or structure transition induced by applied magnetic-field or photo radiation, charge ordering, orbital ordering, and phase separation etc . the full understanding of these properties will definitely stimulate the progress of condensed matter physics 同时,这类材料还表现出诸如磁场或光诱导的绝缘体-金属转变,电荷有序、轨道有序、以及相分离等十分丰富的物理内容,涉及到凝聚态物理的许多基本问题,一旦解决了这些问题的微观物理机制,必将对凝聚态物理的发展和完善起到巨大的推动作用。
applying magnetic suspension technique to the supports of hdd ( hard disk drive ), it have a lot of advantages in comparison with other bearing types, for example, contact free, absence of mechanical friction and wear etc . in design of hdd suspended by amb, it is one, of difficulty and emphases that active control for rotor according as the signal of displacement 将磁悬浮轴承应用于硬盘的支承,完全消除轴承与硬盘转子的机械接触,使硬盘具有其它轴承支承的硬盘无法企及的特点。在磁悬浮硬盘设计中,传感器检测的转子位移信号是控制器对轴承进行主动控制的依据,是整个系统研究的重点和难点之一。
According to the working modes of mr devices, combining the ohm's law of magnetic circuit and the design theory of non-steady magnetic circuit, magnetic structures of the automotive damper have been worked out . to emulate the performance of conventional shock absorber, two automotive mr dampers were designed and fabricated at chongqing university . an applied magnetic field increase the yield stress of mr fluids in flow annular passages, which alters the velocity profile of mr fluid in the passages and raise the pressure gradient between low cavity and high one at some given flow rates 根据磁流变阻尼器工作模式,利用磁路中的欧姆定律和动态磁路设计原理,结合汽车悬架的技术要求和结构特点,提出了基于剪切模式和流动模式共同作用(混合工作模式)的汽车磁流变阻尼器设计原理,讨论了阻尼器动态磁路设计中的若干技术问题;根据流体力学navier-stokes方程,分别利用newton流体特性和bingham流体特性,推导了基于平板模型和轴对称模型的流变学方程,得出了阻尼器阻尼力的计算方法。
When the content of nife _ ( 2 ) o _ ( 4 ) reaches to 30 %, the maximum mr value gets to-6 % at the temperature from 310k to 340k, and the resistivity ranges from 1354 to 646 cm, where applied magnetic field is 1.8t . it is interesting that the mr value is negative which is different from that of the usual material; 4 . with the decreasing of sr contents, the resistivity of composite samples ( nd _ ( 1-x ) sr _ ( x ) mno _ ( 3 ) ) _ ( 0.7 ) / ( nife _ ( 2 ) o _ ( 4 ) ) _ ( 0.3 ) changes apparently, at the same time, the mr gets worse; 5 3系列复合样品的电阻率显著变化,同时磁电阻性能逐渐变差;5.随着cu含量的增大,伽嘶67sr033mnl一uyo3)07/困ifezo4)03系列复合样品的电阻率显著变化,同时磁电阻性能得到明显改善,当cu含量增大到y=0.2时,样品磁电阻值在293k到317k较宽的温度范围内基本保持在一13.6%,随温度变化很小,由于该温区恰好在室温范围且温区宽,因而具有很好的潜在应用价值。
For the sample with the content of fe2o3 is 9 %, the maximum mr value of the composition ( lao9sroimno3 ) o9i ( fe2o3 ) oo9 increased in the negative direction, and get the maximum-7 % at 337k; with the content of feio increased, the mr of the composition increased also, when the content of fe2o3 is 17 %, the maximum mr value of the composition ( lao . gsro imno3 ) o . 83 ( feio o . n can reach-30 % at 338k, where applied magnetic field is 1.5t 含量为9的样品,样品的磁电阻值在238k时随温度的升高而逐渐向负的方向增大,在337k时达到极值7;对于fe。oz含量为门的样品,样品的磁电阻值在265k时随温度的升高而逐渐增大,两种不同比例的复合体系都在很宽的温区内表现出较大的磁电阻,尤其后者,在1st外场作用下,338k时mr达到极值30。
This chapter deals with the influent physics properties and some spectacular phenomenon observed in perovskite manganites, including the structure, magnetic and electronic transport, phase diagram, charge / orbital ordering, and insulator-metal transition induced by applied magnetic field or photo radiation etc . this part is helpful to build up a background for the research on colossal magnetoresistance 包括晶体结构、电子结构、磁性质、输运性质、电磁相图、有序相,以及其他奇特的物理现象。通过本章,我们将了解到掺杂锰氧化物的基本物理性质,为进入该研究领域作好了准备。