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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

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

A Coordinated Search Algorithm for a Lost Target on the Plane

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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

Friction Stir Welding of Dissimilar Aluminum Alloys

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World Journal of Engineering and Technology 2018年第2期6卷 408-419页

作者： Hassan abd el-Hafez abla el-Megharbel Department of Production Engineering and Mechanical Design Faculty of Engineering Port Said University Port Said Egypt

Dissimilar aluminum alloys AA2024-T365 and AA5083-H111 were welded by friction stir process. Welding parameters such as tool rotational speed (900, 1120 and 1400 rpm), weld speeds (16, 40 and 80 mm/min) and tool pin profiles (square, triangular and stepped) were used to weld many joints to study their effect on the mechanical properties of the joint. Also, different locations of the material were studied as other parameter. The mechanical properties were evaluated using tensile and hardness tests. The microstructure characterization of the processed alloys was carried out using optical microscopy. Macro and microstructures of parent and welded specimens indicated that the weld parameters have a significant effect on mechanical and microstructural properties of the welds. However, defect-free as well as higher strength was obtained at higher speed of 80 mm/min.

关键词： Friction Stir Welding Dissimilar Aluminum Alloys Welding Parameters Metallographic AA7075 AA5083