检索结果-南通市图书馆

Journal of Applied Mathematics and Physics 2019年第12期7卷 2990-3002页

作者： siaka touré Solar Energy Laboratory FHB University Abidjan Cocody Abidjan C&#244 te d’Ivoire

The Weibull distribution is a probability density function (PDF) which is widely used in the study of meteorological data. The statistical analysis of the wind speed v by using the Weibull distribution leads to the estimate of the mean wind speed , the variance of v around and the mean power density in the wind. The gamma function Γ is involved in those calculations, particularly Γ (1+1/k), Γ (1+2/k) and Γ (1+3/k). The paper reports the use of the Weibull PDF f(v) to estimate the gamma function. The study was performed by looking for the wind speeds related to the maximum values of f(v), v2 f(v) and v3 f(v). As a result, some approximate relationships were obtained for Γ (1+1/k), Γ (1+2/k) and Γ (1+3/k), that use some fitting polynomial functions. Very good agreements were found between the exact and the estimated values of Γ (1+n/k) that can be used for the estimation of the mean wind speed , the variance σ2 of the wind speed v;around the mean speed and the average wind power density.

关键词： Gamma Function Weibull Distribution Beta Function Mean Wind Speed Average Wind Power Density

Effect of the Dynamic Resistance on the Maximum Output Power in Dynamic Modelling of Photovoltaic Solar Cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Modelling and Simulation 2022年第1期10卷 48-57页

作者： siaka touré Solar Energy Laboratory Félix Houphou&#235t-Boigny University of Abidjan Cocody Abidjan C&#244te d’Ivoire

Several studies on PV solar cells are found in the literature which use static models. Those models are mainly one-diode, two-diode or three-diode models. In the dynamic modelling, a variable parallel capacitance is incorporated. Unlike the previous studies which do not clearly establish a relationship between the capacitance and the voltage, in the present paper, the link between the capacitance and the voltage is investigated and established. In dynamic modelling investigated in this paper, the dynamic resistance is introduced in the modelling of the solar cell. It is introduced in the current-voltage characteristic. The value of the dynamic resistance is evaluated at the maximum power point and its effect on the maximum power is investigated. The study shows for the first time, that the dynamic resistance must be introduced in the current-voltage characteristic, because it has an influence on the PV cell output.

关键词： Photovoltaic Solar Cells Dynamic Modelling Dynamic Resistance Diffusion Capacitance Transition Capacitance

Experimental Study and Thermal Modelling of Cocoa Shell Convective Drying in an Indirect Solar Dryer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Modeling and Numerical Simulation of Material Science 2024年第2期14卷 69-78页

作者： siaka touré Adjo Christelle Ogo Modibo Sidibé Solar Energy Laboratory FHB University of Cocody Abidjan C&#244te d’Ivoire

The concern of the present work is the convective drying of empty cocoa shells in an indirect solar dryer. Some drying experiments, using one sample, were carried out. During the experiments, the sample is introduced in the drying chamber. Then at steady time intervals, the sample is withdrawn from the drying chamber, for a rapid weighing. After each weighing, the sample is reintroduced in the dryer. At each time interval, the ambient temperature of the drying chamber and its relative humidity γ are measured by a thermo-hygrometer. From the experimental data, a theoretical determination of the moisture evaporated from the product was performed and a good agreement was found between the theoretical and experimental values, confirmed by the value of the RMSE. Those calculations used the constants in the Nusselt number found in literature. Then those constants were evaluated again, to get new values more suitable with the experimental data. The dimensionless numbers of Nusselt, Grashof and Prandtl were calculated. That allowed the calculation of the average value of the Nusselt number. The average convective heat transfer coefficient was determined.

关键词： Shells of Cocoa Pods Indirect Solar Dryer Moisture Evaporated Constants of the Nusselt Number Convective Heat Transfer Coefficient

Natural Solar Drying and Charcoal Production by Pyrolysis of Empty Shells of Cocoa Pods Using a Carbonisation Stove Fitted with a Chimney

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2023年第4期17卷 109-120页

作者： siaka touré Adjo Christelle Ogo Modibo Sidibé Solar Energy Laboratory FHB University of Cocody22 BP 582 Abidjan 22Côte d’Ivoire

The world’s production of cocoa highly has grown since *** West Africa,the production reached about 3,000,000 tons in *** than 50%of the world’s production of cocoa comes nowadays from Côte d’Ivoire and Ghana and Côte d’Ivoire is the biggest *** harvesting,the empty shells,considered as non-useful wastes,are abandoned in the fields where they become a source of *** yields millions of tons of biomass that can be converted into charcoal,instead of being sources of *** the present work,the drying kinetics of the empty wet shells were ***,charcoal production by pyrolysis of those empty shells of cocoa pods was performed,using a carbonisation stove fitted with a *** study showed that the empty shells have a high moisture *** different phases of the drying were *** study compared the drying rates and the diffusion coefficients of a small sample and a big *** experiences of carbonisation of the empty shells were successfully carried *** the first experiment,the pyrolysis temperatures were recorded and the charcoal mass efficiency *** the second experiment,the temperatures were higher and the result was colored *** colorations disappeared after some hours.

关键词： Shells of cocoa pods solar drying diffusion coefficient charcoal production carbonisation stove.

Numerical Modeling and Simulation of CIGS-Based Solar Cells with ZnS Buffer Layer

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Modelling and Simulation 2017年第4期5卷 218-231页

作者： Adama Sylla siaka touré Jean-Pierre Vilcot Laboratoire d’Energie Solaire Université Félix Houphou&euml t Boigny Abidjan Cote d’Ivoire Institut d’Electronique de Microélectronique et de Nanotechnologie (IEMN) UMR CNRS 8520. Laboratoire Central Villeneuve d’Ascq Cedex Lille France

Usually a buffer layer of cadmium sulphide is used in high efficiency solar cells based on Cu(In,Ga)Se2(CIGS). Because of cadmium toxicity, many in-vestigations have been conducted to use Cd-free buffer layers. Our work focuses on this type of CIGS-based solar cells where CdS is replaced by a ZnS buffer layer. In this contribution, AFORS-HET software is used to simulate n-ZnO: Al/i-ZnO/n-ZnS/p-CIGS/Mo polycrystalline thin-film solar cell where the key parts are p-CIGS absorber layer and n-ZnS buffer layer. The characteristics of these key parts: thickness and Ga-content of the absorber layer, thickness of the buffer layer and doping concentrations of absorber and buffer layers have been investigated to optimize the conversion efficiency. We find a maximum conversion efficiency of 26% with a short-circuit current of 36.9 mA/cm2, an open circuit voltage of 824 mV, and a fill factor of 85.5%.

关键词： Cu(In1-xGax)Se2 Thin-Film Solar Cell Numerical Modeling AFORS-HET Simulation Optimization

Experimental Investigation of the Stability of the Performance Characteristics of a Photovoltaic Module in the Face of Environmental and Meteorological Factors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2024年第2期14卷 589-608页

作者： Adingra Paul Arsène Kouassi siaka touré Diakaridja Traoré Laboratoire des Sciences de la Matière de l’Environnement et de l’Energie Solaire (LASMES) Unité de Formation et de Recherche des Sciences des Structures de la Matière et Technologie (UFR-SSMT) Université Félix Houphou&#235t Boigny Abidjan C&#244te d’Ivoire

The explosive technological improvement of photovoltaic systems as well as the necessity of populations to come to less expensive energy sources, that have led to an implosion at the level of solar panel manufacturers. This causes a large flow of these equipments to developing countries where the need is high, without any quality control. That conducted an experimental investigation on the performance characteristics of a 250 wp monocrystalline silicon photovoltaic module in other to check the verification and quality control. Most of these PV panels which often have missing informations are manufactured and tested in places that are inadequate for our environmental and meteorological conditions. Also, their influences on the stability of internal parameters were evaluated in order to optimize their performance. The results obtained at maximum illumination (1000 w/m2) confirmed those produced by the manufacturer. The analysis of these characteristics showed that the illumination and the temperature (meteorological factors) influenced at most the stability of the internal characteristics of the module in the sense that the maximum power increased very rapidly beyond 750 w/m2 but a degradation of performance was accentuated for a temperature of the solar cells exceeding 50°C. The degradation coefficients were evaluated at -0.0864 V/°C for the voltage and at -1.6248 w/°C for the power. The 10° inclination angle of the solar panel proved to be ideal for optimizing overall efficiency in practical situations.

关键词： Renewables Energies Instruments Internal Parameters of Photovoltaic Panel Monocrystalline Photovoltaic Panel Solar Energy Production Energy Intermittence

Theoretical Analysis of the Effect of the Interfacial MoSe<sub>2</sub>Layer in CIGS-Based Solar Cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Modelling and Simulation 2021年第4期9卷 339-350页

作者： Adama Sylla N’Guessan Armel Ignace touré siaka Jean-Pierre Vilcot Laboratoitre d’Energie Solaire Universit&#233 F&#233lix Houphou&#235t Boigny Abidjan C&#244te d’Ivoire. Institut d’Electronique de Micro&#233lectronique et de Nanotechnologie (IEMN) UMR CNRS 8520. Laboratoire Central Villeneuve d’Ascq Cedex Lille France

The aim of this work is to analyze the influence of the interfacial MoSe2 layer on the performance of a /n-ZnO/i-ZnO/n-Zn(O,S)/p-CIGS/p+-MoSe2/Mo/SLG solar cell. In this investigation, the numerical simulation software AFORS-HET is used to calculate the electrical characteristics of the cell with and without this MoSe2 layer. Different reported experimental works have highlighted the presence of a thin-film MoSe2 layer at the CIGS/Mo contact interface. Under a tunneling effect, this MoSe2 layer transforms the Schottky CIGS/Mo contact nature into a quasi-ohmic one. Owing to a heavily p-doping, the MoSe2 thin layer allows better transport of majority carrier, tunneling them from CIGS to Mo. Moreover, the bandgap of MoSe2 is wider than that of the CIGS absorbing layer, such that an electric field is generated close to the back surface. The presence of this electric field reduces carrier recombination at the interface. Under these conditions, we examined the performance of the cell with and without MoSe2

Sensitivity of Solar Photovoltaic Panel Efficiency to Weather and Dust over West Africa: Comparative Experimental Study between Niamey (Niger) and Abidjan (Côte d’Ivoire)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computational Water, Energy, and Environmental Engineering 2016年第4期5卷 123-147页

作者： Alima Dajuma Saleye Yahaya siaka touré Arona Diedhiou Rabani Adamou Abdourahamane Konaré Mariama Sido Michel Golba WASCAL MRP Climate Change and Energy Université Abdou Moumouni Niamey Niger Centre National d’Energie Solaire CNES Niamey Niger Laboratoire d’Energie Solaire Université Félix Houphouet Boigny Abidjan Cote d’Ivoire LTHE-IRD Université Grenoble-Alpes Grenoble France Faculté des Sciences et Techniques Université Abdou Moumouni Niamey Niger Centre d’Excellence Africain en Changement Climatique Biodiversité et Agriculture Durable (CCBAD) Université Félix Houphouet Boigny Abidjan Cote d’Ivoire Energy and Semiconductor Research Laboratory Carl von Ossietzky University Oldenburg Oldenburg Germany

Energy demand is increasing while we are facing a depletion of fossils fuels, the main source of energy production in the world. These last years, photovoltaic (PV) system technologies are growing rapidly among alternative sources of energy to contribute to mitigation of climate change. However, PV system efficiency researches operating under West African weather conditions are nascent. The first objective of this study is to investigate the sensitivity of common monocrystalline PV efficiency to local meteorological parameters (temperature, humidity, solar radiation) in two contrasted cities over West Africa: Niamey (Niger) in a Sahelian arid area and Abidjan (Cote d’Ivoire) in atropical humid area. The second objective is to quantify the effect of dust accumulation on PV efficiency in Niamey (Niger). The preliminary results show that PV efficiency is more sensitive to high temperature change especially under Niamey climate conditions (warmer than Abidjan) where high ambient temperatures above 33°C lead to an important decrease of PV efficiency. Increase of relative humidity induces a decrease of PV efficiency in both areas (Niamey and Abidjan). A power loss up to 12.46% is observed in Niamey after 21 days of dust accumulation.

关键词： Solar Energy PV Efficiency Temperature Dust Humidity Niamey Abidjan

Anatomical Study of MRI Optic Chiasm at the Bamako Anatomy Laboratory

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Forensic Medicine and Anatomy Research 2020年第2期8卷 11-17页

作者： Babou Ba siaka Diakité Abdoulaye Kanté Tata touré Moumouna Koné Nouhoum Ongoiba Abdel Karim Koumaré siaka Sidibé Laboratoire d’Anatomie et de Morphologie Clinique FMOS BamakoMali Service de Radiologie CHU Point GBamakoMali Service de Chirurgie“B” CHU Point GBamakoMali

Roughly quadrangular, the chiasma presents many morphological variations. The optical chiasm, odd and symmetrical structure of the optical pathways, is a required passage of the axons of neurons for the visual pathways. Any modification of its morphology evokes a pathological process, generally tumoral. The quality of MRI images rivals that of anatomical slices. So the MRI is essential for the study of the chiasma. The aim of this work was to study the morphometry of the optic chiasm in patients addressed for cerebral MRI to the imaging department of the university hospital of the POINT-G, during the period from July 29, to November 30, 2016. All patients who had a normal examination of the optic chiasma, numbering 15, were included in this study. In 86.66% of cases the chiasma had a quadrilateral form. Its average length was 8.73 mm and its average width was 13 mm. The average thickness was 4.13 mm.

关键词： Optical Chiasma MRI Laboratory Anatomy

Anatomy of the Brachial Plexus:A Rare Variation in the Laboratory of Anatomy of Bamako(Mali)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Forensic Medicine and Anatomy Research 2019年第1期7卷 8-12页

作者： Babou Ba Abdoulaye Kanté Drissa Traoré Bréhima Bengaly Mariam Daou Bréhima Coulibaly Drissa Ouattara siaka Diallo siaka Diakité Moumouna Koné Tata touré Cheickh Tidiane Diallo Ousmane Ibrahim touré Birama Togola Nouhoum Ongoiba Laboratory of Anatomy of the Faculty of Medicine and Odontostomatology BamakoMali Service of Surgery B.CHU Point G BamakoMali Service of Neurology CHU Gabriel TouréBamakoMali

The brachial plexus (BP), established by the lap twigs of the last four cervical nerves and the first thoracic nerve, assures the driving and sensory innervation of the thoracic member. We bring back a case of rare anatomical variation of the brachial plexus. It is a 34-year-old corpse dissected in the laboratory of anatomy of the Faculty of Medicine and Odontostomatology of Bamako in September 2017. The lap twig of the fourth cervical root (C4) participated in the constitution of the brachial plexus. The superior trunk was normally constituted. The average trunk was formed by the cervical roots C7 and C8 instead of only C7. And consequently the inferior trunk was constituted by the thoracic root T1. The posterior beam was only formed by the posterior branches of the superior and more average trunk. The medial beam was formed by all of the inferior trunk which did not give posterior branch for the formation of the posterior beam. The variations of the brachial plexus could entrain failures in the loco regional anesthesia of the brachial plexus.

关键词： Anatomy Brachial Plexus Variation Anesthesia Surgery