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In the last few years, Unmanned Aerial Systems (UAS) have been attracting enormous research interest, being employed in military and civilian missions (e.g. search and rescue, disaster assessment, urban traffic monitoring, 3D mapping, etc.) that would be risky or impossible for a human to perform. For autonomous or aided operations (e.g. automatic or aided landing), it is crucial to have on board...
In this paper, a micro Pirani gauge sensor is studied in the purpose to be exploited for multifunction. Based on the gauge's experimental results, an adequate conditioning circuit and a single configurable CMOS readout have been proposed allowing exploiting the gauge in an original way for multi measurements. Furthermore, the proposed readout is designed in such a way that it offers the possibility...
The effect of CO2 concentration on discharge characteristics in atmospheric air was investigated under nonuniform DC field gap. In the experiment, positive DC voltage was applied to 2.0 cm of needle-plane gap in air with CO2 at atmospheric pressure. As a result, a drastic decrease of the withstand voltage of air caused by a dilute increase of CO2 concentration was confirmed. In addition, it was observed...
This paper presents a novel genetic algorithm to carry out the maximum power point tracking based on the photovoltaic cell model. For that it is necessary to measure the open circuit voltage (Voc) and short circuit current (Isc), then the proposed algorithm gives directly and rapidly the optimal voltage (Vop) so the converter duty cycle can be adjusted. The simulation results are obtained by changing...
The existing IEC standard prescribes humidity correction method of disruptive discharge voltage of standard sphere gaps, which is derived from experimental data under absolute humidity between 5 g/m3 and 12 g/m3. However, higher humidity is experienced in summer in Japan and also all over a year in tropical countries. In the present study, validity of the existing correction method is discussed for...
The real time monitoring and control of resistance spot welds is a problem of critical importance in automotive and many other manufacturing industries. However, till this date, there are no reliable, low-cost, non-destructive techniques for predicting the size and strength of the weld nuggets in real time. This paper investigates the usage of voltage, current, and force data for the above tasks....
Static breakdown in most gases is in accordance with the Paschen's law for pressures up to a few atmospheres, at normal temperatures and uniform-field. However, departures from Paschen's law are observed notably for very small spacing or high pressure. Studies have indicated that the deviation is associated with high electric field, usually greater than 105 V/cm.1,2 For gaps of 2–3 mils, the electric...
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