设计了一款基于STM32的矿用本安型瞬变电磁仪。发射部分通过发射双极性方波抑制工频及其多次谐波干扰;接收部分使用数据叠加、多次迭代实现采集信号的早、中、晚期信号的合成,提高动态范围及信噪比。井下实测表明接收电压由最大43.528 ...设计了一款基于STM32的矿用本安型瞬变电磁仪。发射部分通过发射双极性方波抑制工频及其多次谐波干扰;接收部分使用数据叠加、多次迭代实现采集信号的早、中、晚期信号的合成,提高动态范围及信噪比。井下实测表明接收电压由最大43.528 V下降至1.323μV,其接收动态范围>150 d B;与同类设备进行对比测试,结果与现场巷道人文设施以及出水情况相符,能够满足井下巷道超前探测对矿用瞬变电磁仪的要求。展开更多
By employing Hirota bilinear method and Riemann theta functions of genus one,explicit triply periodic wave solutions for the(2+1)-dimensional Boussinesq equation are constructed under the Backlund transformation u =(1...By employing Hirota bilinear method and Riemann theta functions of genus one,explicit triply periodic wave solutions for the(2+1)-dimensional Boussinesq equation are constructed under the Backlund transformation u =(1 /6)(u0 1) + 2[ln f(x,y,t)] xx,four kinds of triply periodic wave solutions are derived,and their long wave limit are discussed.The properties of one of the solutions are shown in Fig.1.展开更多
文摘设计了一款基于STM32的矿用本安型瞬变电磁仪。发射部分通过发射双极性方波抑制工频及其多次谐波干扰;接收部分使用数据叠加、多次迭代实现采集信号的早、中、晚期信号的合成,提高动态范围及信噪比。井下实测表明接收电压由最大43.528 V下降至1.323μV,其接收动态范围>150 d B;与同类设备进行对比测试,结果与现场巷道人文设施以及出水情况相符,能够满足井下巷道超前探测对矿用瞬变电磁仪的要求。
基金Supported by the National Natural Science Foundation of China under Grant No. 11101382the Natural Science Foundation of Henan Province under Grant No. 2010A110001the Basic and Advanced Technology Project of Henan Province under Grant No. 112300410199
文摘By employing Hirota bilinear method and Riemann theta functions of genus one,explicit triply periodic wave solutions for the(2+1)-dimensional Boussinesq equation are constructed under the Backlund transformation u =(1 /6)(u0 1) + 2[ln f(x,y,t)] xx,four kinds of triply periodic wave solutions are derived,and their long wave limit are discussed.The properties of one of the solutions are shown in Fig.1.
