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For detection of Brucella species by PCR four DNA extraction methods and four targets were compared using pure culture of Brucella melitensis and the best conditions were applied in clinical samples. It was found that the MagNA Pure LC method was the most efficient and sensitivemethod showing a positive PCR reaction with DNA extracted from as low as 25 and 100 CFU suspended in one ml blood and one...
In this work we present a new techniques to detect a mechanical faults in asynchronous machines by exploiting the instantaneous frequencies estimated starting from an accelerometer sensor, optical encoder and stator current. Bearing damages cause a torque oscillations as well as a disturbance in the velocity signal which can be detected by a mechanical measurements. These fluctuations will be reflected...
We present in this paper the detection of a rolling defect in an asynchronous machine by analysis of the electric signals. For this purpose, we used a Wiener filter to decrease the dynamics of the 50 Hz and to increase the frequencies associated to the mechanical load. Thus, we could detect the presence of a ball defect. This result is corroborated by an envelope analysis of the vibratory signals...
We present in this paper the detection of a rolling defect in an asynchronous machine by analysis of the electric signals. For this purpose, we used a Wiener filter to decrease the dynamics of the 50 Hz and to increase the frequencies associated to the mechanical load. Thus, we could detect the presence of a ball defect. This result is corroborated by an envelope analysis of the vibratory signals...
Despite the availability of safe and effective live attenuated vaccines, measles continues to be endemic in many developing countries. Control and elimination of measles will be especially difficult in East Africa, because of its limited infrastructure and political instability. We have studied diagnostic and epidemiological aspects of measles in suburban Khartoum, Sudan. Prospective studies were...
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