随着科学技术的发展,材料分析方法日益丰富,材料测试设备不断更新,仪器测量精度也越来越高。然而,与测试设备匹配的专业数据处理软件的开发和应用却发展缓慢。基于量子设计公司的振动样品磁强计(VSM)所测Nd Fe B磁性材料的M-H数据,利用M...随着科学技术的发展,材料分析方法日益丰富,材料测试设备不断更新,仪器测量精度也越来越高。然而,与测试设备匹配的专业数据处理软件的开发和应用却发展缓慢。基于量子设计公司的振动样品磁强计(VSM)所测Nd Fe B磁性材料的M-H数据,利用MATLAB7.0自带拟合工具对数据进行了三角函数拟合,并通过拟合反函数对磁测量数据进行了运算,得到相应的矫顽力Hc和剩磁Mr值,从而准确地表示了材料的磁学性能。展开更多
The geomagnetic field over Akure, southern Nigeria （7°15＇ N; 5°12＇ E） was investigated from direct observation for a period of two years （2005-2006）. Geomagnetic field over Akure was monitored and meas...The geomagnetic field over Akure, southern Nigeria （7°15＇ N; 5°12＇ E） was investigated from direct observation for a period of two years （2005-2006）. Geomagnetic field over Akure was monitored and measured using a locally produced magnetometer. The geomagnetic data generated were evaluated at every local time hour. Diurnal, monthly and Seasonal effects were investigated. The results of the analyses from the magnetic data generated provide a comprehensive understanding of the geomagnetic variation over the region. This research validates the instrument and presents a direct measurement opportunity to capture the influence of local sources.展开更多
文摘随着科学技术的发展,材料分析方法日益丰富,材料测试设备不断更新,仪器测量精度也越来越高。然而,与测试设备匹配的专业数据处理软件的开发和应用却发展缓慢。基于量子设计公司的振动样品磁强计(VSM)所测Nd Fe B磁性材料的M-H数据,利用MATLAB7.0自带拟合工具对数据进行了三角函数拟合,并通过拟合反函数对磁测量数据进行了运算,得到相应的矫顽力Hc和剩磁Mr值,从而准确地表示了材料的磁学性能。
文摘The geomagnetic field over Akure, southern Nigeria （7°15＇ N; 5°12＇ E） was investigated from direct observation for a period of two years （2005-2006）. Geomagnetic field over Akure was monitored and measured using a locally produced magnetometer. The geomagnetic data generated were evaluated at every local time hour. Diurnal, monthly and Seasonal effects were investigated. The results of the analyses from the magnetic data generated provide a comprehensive understanding of the geomagnetic variation over the region. This research validates the instrument and presents a direct measurement opportunity to capture the influence of local sources.
