V2O5-CaCo3-Nb2O5掺杂对低损耗功率Mn-Zn铁氧体的影响     

宋晓敏  龚小燕  李纲  彭声谦  邵峰 《上海大学学报(英文版)》2005,9(6):561-564

Effect of the content of dopants in the manganese-zinc ferrites on the low power loss is studied by measuring magnetic properties and observing the grain boundary structures. The Mn0.738Zn0.206Fe2.066O4 composition powders were prepared by using conventional ceramic powder processing technique. The microstructure of grain boundary was observed by scanning electron microscope （SEM）. It has been found that power loss is greatly dependent upon the content of the additives.  相似文献   

V_2O_5-CaCo_3-Nb_2O_5掺杂对低损耗功率Mn-Zn铁氧体的影响(英文)     

宋晓敏  龚小燕  李纲  彭声谦  邵峰 《上海大学学报(英文版)》2005,(6)

1IntroductionApplication of Mn-Zn ferrites in power electronics isconstantly expanding. Demands on small and efficientswitching power supplies are rising to meet therequirement of compact and power saving electronicequipment . In a switching power supply, the trans-former takes up a large portion of cubage and powerloss .It is thereforei mportant to reduce the power lossof Mn-Zn ferrites used as the transformer core .Core loss is known to be dividable into three com-ponents :hysteresis loss …  相似文献   

中介语僵化成因及其对外语教学的启示     

龚小燕 《襄樊职业技术学院学报》2009,8(3)

中介语的僵化是二语习得中一种不可避免的现象.本文论述了僵化的定义,归纳了几种有关僵化的成因,并对缓解僵化提出了建议.  相似文献