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通道失衡
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  channel mismatch
     SAR/DPCA(Displaced Phase Center Antenna) technique is a simple and practical method of multi-channel SAR/GMTI(Graund Moving Target Indication), but in practice it is limited by some kinds of errors, in which antenna phase center velocity error and channel mismatch are the most important errors.
     SAR/DPCA技术是一种简单实用的多通道SAR运动目标检测方法,实际应用中会受到各种误差因素的限制,其中影响算法性能最大的两类误差是载机速度误差和通道失衡
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     nformation passage
     信息通道
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     N—Path digital filter
     N通道数字滤波器
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     the consumption loses equilibrium;
     消费失衡
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     On the Balance and imbalance of Administrational Law
     行政法的失衡与平衡
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  channel mismatch
Furthermore, we evaluate the performance of these detectors in the presence of channel mismatch.
      
Therefore, in the presence of channel mismatch, the decorrelator offers comparable or even better performance than more complex decision-feedback and two-stage detectors.
      
DS1 equal channel condition, the channel number of the training and testing data is equal, no channel mismatch exists.
      
To speed up the radix detection algorithm even more, some channel mismatch calibration methods could also be employed with added circuitry.
      
The SpeechDat-E database is almost noise-free and the only channel mismatch is represented by variances in telephone channels.
      
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Objective To observe the effects of ouabain and aconitine on I_(Na) of isolated guinea pig and rat ventricular myocytes.To discuss the arrhythmic mechanisms of the two drugs.Methods Whole cell patch clamp mode was used to record sodium current of isolated single ventricular myocytes.Results 5μmol/L ouabain inhibited I_(Na) from(-48.3±8.9) pA/pF to (-22.6±5.6) pA/pF at-40mV(inhibition rate of 60.1%,n=5,P<0.01).1μmol/L aconitine increased I_(Na) from(-21.8±5.8)pA/pF to(-67.3±7.8)pA/pF at-40mV(increase rate of...

Objective To observe the effects of ouabain and aconitine on I_(Na) of isolated guinea pig and rat ventricular myocytes.To discuss the arrhythmic mechanisms of the two drugs.Methods Whole cell patch clamp mode was used to record sodium current of isolated single ventricular myocytes.Results 5μmol/L ouabain inhibited I_(Na) from(-48.3±8.9) pA/pF to (-22.6±5.6) pA/pF at-40mV(inhibition rate of 60.1%,n=5,P<0.01).1μmol/L aconitine increased I_(Na) from(-21.8±5.8)pA/pF to(-67.3±7.8)pA/pF at-40mV(increase rate of 208.7%,n=4,P<0.01).Conclusion Ouabain can decrease sodium current and aconitine can increase sodium current.Either decrease or increase of I_(Na),these two drugs could destroy the balance of ion channels in the heart which is the important mechanism of arrhythmia.

目的观察哇巴因和乌头碱对豚鼠和大鼠心肌细胞钠电流的作用,探讨二药诱发心律失常的机制。方法用全细胞膜片钳技术分别记录豚鼠和大鼠单个心肌细胞钠电流。结果在-40mV电压下,哇巴因5μmol/L使INa从(-48.3±8.9)pA/pF减少到(-22.6±5.6)pA/pF(抑制60.1%,n=5,P<0.01);乌头碱1μmol/L使INa从(-21.8±5.8)pA/pF增加到(-67.3±7.8)pA/pF(增加208.7%,n=4,P<0.01)。结论哇巴因抑制豚鼠心肌细胞钠电流而乌头碱增加大鼠心肌细胞钠电流。不论是抑制还是促进钠电流,二药均使离子通道失衡,这是其诱发心律失常的重要机制。

SAR/DPCA(Displaced Phase Center Antenna) technique is a simple and practical method of multi-channel SAR/GMTI(Graund Moving Target Indication), but in practice it is limited by some kinds of errors, in which antenna phase center velocity error and channel mismatch are the most important errors. In this paper, the error analysis model is founded and the loss of moving target detection performance is analyzed under the circumstance of antenna phase center velocity error or channel mismatch. The error analysis...

SAR/DPCA(Displaced Phase Center Antenna) technique is a simple and practical method of multi-channel SAR/GMTI(Graund Moving Target Indication), but in practice it is limited by some kinds of errors, in which antenna phase center velocity error and channel mismatch are the most important errors. In this paper, the error analysis model is founded and the loss of moving target detection performance is analyzed under the circumstance of antenna phase center velocity error or channel mismatch. The error analysis results are shown on the figures and the range of detectable velocity, blind velocity and minimum detectable velocity are confirmed on the basis of actual parameters of dual-channel SAR/DPCA system.

SAR/DPCA技术是一种简单实用的多通道SAR运动目标检测方法,实际应用中会受到各种误差因素的限制,其中影响算法性能最大的两类误差是载机速度误差和通道失衡。该文详细地分析了这两类误差因素对SAR/DPCA算法性能的影响,建立了误差分析模型,针对实际参数给出了误差分析的结果,并确定了一定误差条件下的系统可检测速度范围、盲速和最小可检测速度。

 
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