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A Coordinated Search algorithm for a Lost Target on the Plane

Computer Systems Science & Engineering 2022年第1期40卷 127-137页

作者： Sundus Naji al-aziz abd al-aziz hosni el-bagoury W.Afifi Department of Mathematics College of SciencePrincess Nourah bint Abdulrahman UniversityRiyadhSaudi Arabia Department of Mathematics Faculty of ScienceTanta UniversityTantaEgypt Department of Mathematics and Statistics College of ScienceTaibah UniversityYanbuSaudi Arabia

Concepts in search theory have developed since World War *** study of search plans has found considerable interest among searchers due to its wide applications in our *** for lost targets either located or moved is often a time-critical issue,especially when the target is very *** many commercial and scientific missions at sea,it is of crucial importance to find lost targets *** illustrate a technique known as coordinated search,that completely characterizes the search for a randomly located target on a *** idea is to avoid wasting time looking for a missing *** searchers or robots start from the center of a circle to search out a lost target,the first searcher looks for the target on the right side of the circular area,and the second one looks for it on the left *** time taken to detect the target is obtained by assuming the target’s position has a symmetric *** procedures to facilitate the detection of the target are presented as an algorithm and as a *** application demonstrates the applicability of this search technique and the associated decrease in search *** effectiveness is illustrated by numerical results,which indicates considerable promise.

关键词： Expected value sensors lost target coordinated search search algorithm lost ship

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An Improved Design of a Fully Automated Multiple Output Micropotentiometer

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Energy and Power Engineering 2010年第2期2卷 103-110页

作者： Hala Mohamed abdel Mageed Ahmed Faheem Zobaa Mohamed Helmy abdel Raouf Abla hosni abd el-Rahman Mohamed Mamdouh abdel aziz National Institute for Standards GizaEgypt University of Exeter ExeterUK Cairo University GizaEgypt

This paper describes in details a new design of a fully automated multiple output micropotentiometer (?pot). A prototype has been built at the National Institute for Standards (NIS), Egypt to establish this highly improved AC voltage source in the millivolt range. The new device offers three different outputs covering a wide frequency range from only one outlet. This valuably supports the precise sourcing ranges of low AC voltage at NIS. The design and the operation theory of this prototype have been discussed in details. An automatic calibration technique has been introduced through specially designed software using the LabVIEW program to enhance the calibration technique and to reduce the uncertainty contributions. Relative small AC-DC differences of our prototype in the three output ranges are fairly verified. The expanded uncertainties of the calibration results for the three output ranges have been faithfully estimated. However, further work is needed to achieve the optimum performance of this new device.

关键词： Multiple Output μpot AC-DC Transfer Standard Single Junction Thermal Converter Calibration Uncertainty

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Temperature Effects on the electrical Performance of Large Area Multicrystalline Silicon Solar Cells Using the Current Shunt Measuring Technique

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Engineering（科研） 2010年第11期2卷 888-894页

作者： Hala Mohamed abdel Mageed Ahmed Faheem Zobaa Mohamed Helmy abdel Raouf Abla hosni abd el-Rahman Mohamed Mamdouh abdel aziz 不详

The temperature effects on the electrical performance of a large area multicrystalline silicon solar cell with back-contact technology have been studied in a desert area under ambient conditions using the current shunt measuring technique. Therefore, most of the problems encountered with traditional measuring techniques are avoided. The temperature dependency of the current shunt from 5oC up to 50oC has been investigated. Its temperature coefficient proves to be negligible which means that the temperature dependency of the solar cell is completely independent of the current shunt. The solar module installed in a tilted position at the optimum angle of the location, has been tested in two different seasons (winter and summer). The obtained solar cell short circuit current, open circuit voltage and output power are correlated with the measured incident radiation in both seasons and all results are discussed.

关键词： Large Area Multicrystalline Silicon Solar Cell Current Shunt Measuring Technique Temperature Effects Short Circuit Current Open Circuit Voltage Accumulated Power Incident Radiation

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electrical Performance Study of a Large Area Multicrystalline Silicon Solar Cell Using a Current Shunt and a Micropotentiometer

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Engineering（科研） 2010年第4期2卷 263-269页

作者： Hala Mohamed abdel Mageed Ahmed Faheem Zobaa Ahmed Ghitas Mohamed Helmy abdel Raouf Mohamed Sabry Abla hosni abd el-Rahman Mohamed Mamdouh abdel aziz 不详

In this paper, a new technique using a Current Shunt and a Micropotentiometer has been used to study the electrical performance of a large area multicrystalline silicon solar cell at outdoor conditions. The electrical performance is mainly described by measuring both cell short circuit current and open circuit voltage. The measurements of this cell by using multimeters suffer from some problems because the cell has high current intensity with low output voltage. So, the solar cell short circuit current values are obtained by measuring the voltage developed across a known resistance Current Shunt. Samples of the obtained current values are accurately calibrated by using a Micropotentiometer (μpot) thermal element (TE) to validate this new measuring technique. Moreover, the solar cell open circuit voltage has been measured. Besides, the cell output power has been calculated and can be correlated with the measured incident radiation.

关键词： Large Area Multicrystalline Silicon Solar Cell Current Measurements Calibration Current Shunt Micropotentiometer Short Circuit Current Open Circuit Voltage

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