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Numerical Investigation and Optimization of a Flat Plate Solar Collector Operating with Cu/CuO/Al_(2)O_(3)–Water Nanofluids

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Transactions of Tianjin University 2021年第1期27卷 64-76页

作者： Youssef Belkassmi Kamal Gueraoui Lahoucine El maimouni Najem Hassanain omar tata ERMAM Polydisciplinary Faculty of OuarzazateIbn Zohr UniversityBox 638OuarzazateMorocco MSME Faculty of SciencesMohammed-V UniversityRabatMorocco Group of Semiconductors and Environmental Sensor Technologies-Energy Research Center Faculty of ScienceMohammed-V UniversityB.P.1014RabatMorocco GEMS Laboratory ENSAIbn Zohr UniversityB.P.1136AgadirMorocco

Nanofluids are a potential alternative to significantly improving the performance of heat transfer applications. In this work, a numerical analysis to examine the eff ect of dispersing copper(Cu), copper oxide(CuO), and aluminum(Al2O3) nanoparticles in pure water on the performance of a flat plate solar collector(FPSC) and a numerical model was proposed. The influence of the nanofluid type on the thermal efficiency was critically investigated and discussed. The eff ect of the mass flow rate on the performance was also analyzed and discussed. Based on correlations of the thermophysical properties of nanofluids, a sensitivity analysis was used to analyze the impact of the nanoparticles on the base fluid. The results indicate that the performance of the FPSC with Cu/water nanofluid was better than that of FPSCs using CuO/water or Al2O3/water nanofluids. When the mass flow rate of the nanofluids was 8.0 L/min, the efficiency of the FPSC was much greater than those at the flow rates of 5.0 L/min and 2.0 L/min. Mean enhancements in thermal efficiency of 4.44%, 4.27%, and 4.21% were observed when 2.0 L/min was applied using Cu/water, Cu O/water, and Al2O3/water nanofluids, respectively. Improvements in thermal efficiency of 2.76%, 2.53%, and 2.47% occurred when 8.0 L/min was applied.

关键词： Flat plate solar collector Solar energy Thermal efficiency Nanofluids Al_2O_3/water Cu/water CuO/water

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Audit of the Physico-Chemical Quality of Amoxicillin Based Drugs Marketed in Senegal

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American Journal of Analytical Chemistry 2023年第9期14卷 351-361页

作者： Coulibaly Dalané Bernadette Sow Fatoumata tata Naco Mohamed El Béchir N’Diaye Mahamar Toure Hamadoun Abba Mariko Madani Dackouo Blaise Diouf Diéry Koumare Benoit Yaranga Sarr Serigne omar Faculty of Medicine Pharmacy and Odonto-Stomatology University Cheik Anta DIOP Dakar Dakar Sénégal Faculty of Pharmacy of Bamako University of Technical and Technological Sciences of Bamako (FAPH/USTTB) Bamako Mali National Health Laboratory of Mali Bamako Mali National Drug Control Laboratory of Senegal (LNCM) Dakar Sénégal

Non-compliant antibiotics pose problems of therapeutic efficacy at the level of the individual, but also a serious public health problem. The objective of our study was to evaluate the quality of generic amoxicillin (42 samples) by analytical methods in Dakar/Senegal. At 100% visual inspection of compliance;100% compliance uniformity test;at the dissolution test all > 80% (86.8% to 108.8%). The presence of amoxicillin with the following contents: Tablets (95.2% to 104.1%);Capsules (91.5% to 113.9%) and Suspensions drinkable (96.9% - 118.7%). All the samples in our study are 100% compliant according to the European and American pharmacopoeias (90% - 120%). Other studies should therefore be oriented in the direction of stability as well as the dosage of degradation products.

关键词： Quality Control Amoxicillin Analytical Methods

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