During transient electromagnetic method （TEM） exploration of a copper mine, we detected the late-channel TEM signal reversal phenomenon （a voltage change from positive to negative） caused by the influence of the i...During transient electromagnetic method （TEM） exploration of a copper mine, we detected the late-channel TEM signal reversal phenomenon （a voltage change from positive to negative） caused by the influence of the induced polarization （IP） effect, which affects the depth and precision of the TEM detection. The conventional inversion method is inefficient because it is difficult to process the data. In this paper, the Cole-Cole model is adopted to analyze the effect of Dc resistivity, chargeability, time constant, and frequency exponent on the TEM response in an homogeneous half space model. Singular Value Decomposition （SVD） is used to invert the measured TEM data, and the Dc resistivity, chargeability, time constant and frequency exponent were extracted from the measured TEM data in the mine area. The extracted parameters are used for interpreting the detection result as a supplement. This reveals why the TEM data acquired in the area has a low resolution. It was found that the DC resistivity and time constant do not significantly change the results, however, the chargeability and frequency exponent have a significant effect. Because of these influences, the SVD method is more accurate than the conventional method in the apparent resistivity profile. The area of the copper mine is confined accurately based on the SVD inverted data. The conclusion has been verified by drill and is identical to the practical geological situation.展开更多
太空中的单粒子效应会对电子器件造成损伤,地面模拟是评估器件抗辐射性能的有效途径。现有的模拟方法大多是基于器件的物理底层模型进行电流源脉冲故障注入,不适用于百万门级大规模集成电路(very large scale integration,VLSI)。针对...太空中的单粒子效应会对电子器件造成损伤,地面模拟是评估器件抗辐射性能的有效途径。现有的模拟方法大多是基于器件的物理底层模型进行电流源脉冲故障注入,不适用于百万门级大规模集成电路(very large scale integration,VLSI)。针对该问题,提出了一种从器件高层行为模型注入单粒子翻转故障的方法,并基于8051 IP核进行了单粒子一位翻转和连续两位翻转的仿真和实验比较。研究结果表明,单粒子翻转故障可直接注入到器件的高层来评估系统的抗单粒子性能。展开更多
In this paper the authors propose the natural field induced polarization (IP) method and present the way to pick up IP effect. The relations between the object and anomaly are studied by taking field experiments as ex...In this paper the authors propose the natural field induced polarization (IP) method and present the way to pick up IP effect. The relations between the object and anomaly are studied by taking field experiments as examples. The effectiveness and usability of the method are testified.展开更多
基金supported by the National Technology R&D Program in the 11th Five year Plan of China(No.2007BAQ00168-1-1)the National Natural Science Foundation of China(No. 41103052/D0309)the Shanxi Province Excellent Graduate Innovation Program(No. 20113038)
文摘During transient electromagnetic method （TEM） exploration of a copper mine, we detected the late-channel TEM signal reversal phenomenon （a voltage change from positive to negative） caused by the influence of the induced polarization （IP） effect, which affects the depth and precision of the TEM detection. The conventional inversion method is inefficient because it is difficult to process the data. In this paper, the Cole-Cole model is adopted to analyze the effect of Dc resistivity, chargeability, time constant, and frequency exponent on the TEM response in an homogeneous half space model. Singular Value Decomposition （SVD） is used to invert the measured TEM data, and the Dc resistivity, chargeability, time constant and frequency exponent were extracted from the measured TEM data in the mine area. The extracted parameters are used for interpreting the detection result as a supplement. This reveals why the TEM data acquired in the area has a low resolution. It was found that the DC resistivity and time constant do not significantly change the results, however, the chargeability and frequency exponent have a significant effect. Because of these influences, the SVD method is more accurate than the conventional method in the apparent resistivity profile. The area of the copper mine is confined accurately based on the SVD inverted data. The conclusion has been verified by drill and is identical to the practical geological situation.
文摘太空中的单粒子效应会对电子器件造成损伤,地面模拟是评估器件抗辐射性能的有效途径。现有的模拟方法大多是基于器件的物理底层模型进行电流源脉冲故障注入,不适用于百万门级大规模集成电路(very large scale integration,VLSI)。针对该问题,提出了一种从器件高层行为模型注入单粒子翻转故障的方法,并基于8051 IP核进行了单粒子一位翻转和连续两位翻转的仿真和实验比较。研究结果表明,单粒子翻转故障可直接注入到器件的高层来评估系统的抗单粒子性能。
基金The study is supported by the National Natural Science Foundation of China
文摘In this paper the authors propose the natural field induced polarization (IP) method and present the way to pick up IP effect. The relations between the object and anomaly are studied by taking field experiments as examples. The effectiveness and usability of the method are testified.
