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Modeling global solar radiation using ambient temperature

Cleaner Energy Systems 2024年 7卷

作者： Ali, Mohamed A. Elsayed, Ashraf Elkabani, Islam Youssef, M. Elsayed Hassan, Gasser E. Computer Based Engineering Applications Department Informatics Research Institute City of Scientific Research and Technological Applications (SRTA-City) New Borg El-Arab City Alexandria 21934 Egypt Department of Mathematics and Computer Science Faculty of Science Alexandria University Alexandria Egypt Faculty of Industrial and Energy Technology Borg Al Arab Technological University Alexandria Egypt Faculty of Computer Science and Engineering AlAlamein International University El Alamein Egypt

Accurate information about solar radiation is regarded as the most important stage in determining the availability of solar energy. As well, it is considered the principal input for various applications of solar energy. Because solar radiation measurements are unavailable at many locations throughout the world, many solar radiation models have been developed to predict global solar radiation. In this regard, this study objects to develop accurate and quick Global Solar Radiation (GSR) models for new locations, which currently lack an accurate model. Additionally, assess the performance of a recently introduced model, one of the best temperature-based models for GSR estimation, in these five new sites. Moreover, the proposed model's generalization capacity is investigated over the whole zone, the Suez Canal Zone, and a comparative analysis of its performance is presented. Models’ estimation is compared to the observed values, and the most common performance indicators are obtained to assess models’ performance. The findings indicate that the developed models in this study can predict global solar radiation accurately. Where the Models’ performance, both the local and general models, are larger than 95 % at all sites except for the local one at Port Said City (coastal site), it is 91 %. Additionally, the developed models have good RMSE and MABE values which range from 0.8 to 1.8 (MJ/m² day⁻¹) and 0.7 to 1.7 (MJ/m² day⁻¹), successively. Besides, they have excellent performance with coefficient of determination (R²) values ranging from 0.95 to 0.98, whereas prior research's ranges are 0.884–0.895 for R² and 2.69–3.367 (MJ/m² day⁻¹) for RMSE. Therefore, the developed models in this study can be utilized for accurate GSR forecast, with their high applicability which may be achieved by combining them with various long- or short-term weather forecasting approaches, that are mostly used t

关键词： Egypt Empirical models Solar energy Solar radiation Suez canal

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Assessing the performance of novel and sustainable electrochemical sensor based on cobalt sulfide/upcycled reduced graphene oxide from plastic waste

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Electrochemistry Communications 2025年

作者： Arafat Toghan N. Roushdy Sami A. Al-Hussain Mohamed S. Elnouby Samah M. Yousef A.A.M. Farag M. Elsayed Youssef Noha A. Elessawy Chemistry Department College of Science Imam Mohammad Ibn Saud Islamic University (IMSIU) Riyadh 11623 Saudi Arabia Electronics Materials Department Advanced Technology and New Materials Research Institute City of Scientific Research and Technological Applications (SRTA-City) New Borg El-Arab City Alexandria 21934 Egypt Nanomaterials and Composites Research Department Advanced Technology and New Materials Research Institute City of Scientific Research and Technological Applications (SRTA-City) New Borg El-Arab City Alexandria 21934 Egypt Basic Science Department Higher Institute of Engineering and Technology New Borg El-Arab City Alexandria Egypt Thin Film Laboratory Physics Department Faculty of Education Ain Shams University Heliopolis Roxy Cairo 11757 Egypt Computer Based Engineering Applications Dept. Informatics Research Institute City of Scientific Research and Technological Applications (SRTA-City) New Borg El-Arab City Alexandria 21934 Egypt

Developing electrochemical sensors that are both highly sensitive and environmentally sustainable is a pressing need in modern healthcare and environmental analysis. In this study, a cobalt sulfide/reduced graphene oxide (CoS/rGO) nanocomposite was synthesized via a straightforward, low-cost method that integrates thiourea and cobalt acetate to form CoS, with rGO derived from recycled plastic waste. The structural and electrochemical properties of the composites were systematically investigated using cyclic voltammetry (CV) and linear sweep voltammetry (LSV). The addition of rGO, varied from 0 to 50 wt%, notably enhanced the electrical conductivity and surface activity of the sensing interface. Among the tested formulations, the composite containing 40 wt% rGO exhibited the highest performance, achieving a sensitivity of 12.4 μA mM −1  cm −2 and a detection limit of 0.2 μM, which is approximately 7.5 times lower than that of pristine CoS. Kinetic analysis confirmed that the sensing mechanism follows a pseudo-second-order model, indicative of a chemisorption-driven interaction between paracetamol molecules and the sensor surface. The sensor displayed excellent operational stability over 100 consecutive cycles and high repeatability with a relative standard deviation below 2.5 %. This work demonstrates a novel, green strategy for sensor fabrication that effectively combines electronic functionality with environmental sustainability, making the CoS/rGO nanocomposite a viable platform for next-generation sensing technologies.

关键词： CoS NPs Plastic waste recycling Reduced graphene oxide Paracetamol Sensitivity-kinetic assessments

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Solar Driven Agricultural Greenhouse Integrated with Desalination System;Energy-Water-Food Nexus

Research Square

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Research Square 2020年

作者： Abdullahi, Kabir Salah, Alaa Fath, Hassan Department of Environmental Engineering Egypt-Japan University of Science and Technology Alexandria21934 Egypt Abuja Environmental Protection Board Cadastral Zone 776 Central Business District Abuja Nigeria Computer Based Engineering Applications Department Informatics Research Institute City of Scientific Research and Technological Application New Borg El Arab City Alexandria21934 Egypt

This study presents the effective performance of a sustainable solar driven agricultural greenhouse (GH) self-reliant of energy and irrigation water via desalination. The GH is furnished with infrastructures such as;(i) - an inlet condenser for cool air exchanger and partial water production, (ii) - an internal cavity for crop production (iii) - roof transparent solar distillers (TSD) for solar desalination and partial shading and (iv)- a thermal chimney for natural air ventilation. A mathematical model is developed to predict the performance of the sustainable GH system. A coupled approach of MATLAB/Simulink and computational fluid dynamics (CFD) based on three simulation models were used: solar radiation, thermal energy balance and CFD model. Two parametric studies were carried out. The first one analyzed the effects of different air velocity on the system thermal performance and natural ventilation rate. The second study assessed the effects of different covering material on the transmitted solar radiation. Results from the model shows that 8.5 MJ/*** of total solar radiation is transmitted into the GH. The greenhouse air temperature is lowered by 5°C and humidified by 20%, to satisfy the required conditions necessary for plant growth. Maximum water yield of 11.5 L/*** was obtained, aided by the addition of Al-metal net. Additionally, 2.6 kWh/*** of power is consumed by the air-cooling condenser. At air velocity of 0.3 m/s, there is a natural tendency of air to flow by draft, due to air temperature difference of up to 4 °C. Furthermore, glass and EVA cover materials transmit 52 and 48 % of solar radiation into the GH respectively. The proposed system will enable the parallel production of water and food and enhance economical plant productivity. © 2020, CC BY.

关键词： Desalination

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A novel approach for protein spots quantification in two-dimensional gel images

International Journal of Signal Processing, Image Processing...

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International Journal of Signal Processing, Image Processing and Pattern Recognition 2011年第1期4卷 1-14页

作者： Rashwan, Heshmat A. Sarhan, Amany M. Faheem, Muhammed Talaat Youssef, Bayumy A. Knowledge-Based Systems Department Informatics Research Institute Mubarak City for Science and Technology Borg ElArab Alexandria Egypt Computers and Automatic Control Engineering Department Faculty of Engineering University of Tanta Tanta Egypt Computer-Based Applications Department Informatics Research Institute Mubarak City for Science and Technology Borg ElArab Alexandria Egypt

Two-dimensional polyacrylamide gel electrophoresis of proteins is a robust and reproducible technique. It is the most widely used separation tool in proteomics. Current efforts in the field are directed at development of tools for expanding the range of proteins accessible with two-dimensional gels. Proteomics was built around the two-dimensional gel. The idea that multiple proteins can be analyzed in parallel grew from two-dimensional gel maps. Proteomics researchers needed to identify interested protein spots by examining the gel. This is time consuming, labor extensive and error prone. It is desired that the computer can analyze the proteins automatically by first detecting then quantifying the protein spots in the 2-D gel images. In our previous work, we presented a new technique for segmentation of 2-D gel images using the fuzzy c-means algorithm using the notion of fuzzy relations. In this paper, we will describe the new relational fuzzy c-means algorithm (RFCM) and use it for automatic protein spots quantification. We will also use two methods to evaluate its performance: the unsupervised evaluation method and comparison with the expert spots quantification.

关键词： Proteins

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PERFORMANCE OF A PRIORITIZED ON-BOARD BASEBAND SWITCH FOR A MULTISERVICE MULTIBEAM SATELLITE

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 283-297页

作者： BOHM, S ELHAKEEM, AK HACHICHA, M Department of Electrical and Computer Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal H3A 1M8 Canada Was born in Montreal Canada on 14 September 1966. He received the B. Eng. degree in electrical engineering from Concordia University Montreal Canada in 1989. He is at present completing the M.A.Sc. degree in electrical engineering at Concordia University. (S'75–S'79–M'79–SM'86) received the Ph.D. degree from Southern Methodist University Dallas TX in 1979. He spent the next two years working as a Visiting Professor in Egypt after which he moved to Ottawa Canada in 1982. He assumed teaching and research positions in Carleton and Manitoba Univerities and later moved to Concordia University Montreal Canada in 1983 where he is now a Professor in the Electrical and Computer Engineering Department. He has published numerous papers in IEEE and international journals in the areas of spread spectrum and networking. He is a well-known expert in these areas and serves as a consultant to many companies. His current research interests include wide-band metropolitan networks switching architectures and performance of on-board multibeam satellites acquisitionless CDMA networks code distribution and orthogonalization of CDMA signals responsive congestion control for ATM-based networks ARQ techniques and investigation of the novel SUGAR CDMA systems in fading channels. Dr. Elhakeem is a Senior Member of the Canadian Electrical Engineering Society and Armed Forces Association. He has chaired numerous technical sessions in IEEE Conferences was the Technical Program Chairman for IEEE Montech 1986 Montreal Canada. Dr. Elhakeem is the key guest editor of theIEEE Journal of Selected Areas in Communicationsfor the May June issues 1993 covering CDMA networks. Advanced Technology & Networks VISTAR Telecommunications Inc. Ottawa Ontario K1G 3J4 Canada An Associate Director of Advanced Technology & Networks Group VISTAR Telecommunications Inc. Ottawa Canada. He is also an Adjunct Pr

In this paper, we study the performance of a prioritized on-board baseband switch in conjunction with a multibeam satellite handling integrated services. The services considered for the analysis include voice, video, file transfer and interactive data. The prioritized switch uses both input and output buffering, switch speed-up as well as a two-phase head-of-line resolution algorithm, in order to reduce the buffer loss while maintaining acceptable user delays. The minimum required buffer capacity and switch speed-up for each service in a prioritized environment are found under uniform traffic conditions. It is shown that under uniform traffic conditions, only minimal buffering and switch speed-up are needed even for the lowest priority users. The performance dependence on the switch size is also substantially reduced with head of line resolution and buffering even in a prioritized environment.

关键词： SWITCH ON-BOARD BASEBAND MULTIBEAM PRIORITIZED HEAD-OF-LINE UNIFORM LOAD SPEED-UP

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MAGNETOHYDRODYNAMIC SUBMARINE PROPULSION SYSTEMS

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NAVAL ENGINEERS JOURNAL 1991年第3期103卷 141-157页

作者： SWALLOM, DW SADOVNIK, I GIBBS, JS GUROL, H NGUYEN, LV VANDENBERGH, HH Daniel W. Swallomis the director of military power systems at Avco Research Laboratory Inc. a subsidiary of Textron Inc. in Everett Mass. Dr. Swallom received his B.S. M.S. and Ph.D. degrees in mechanical engineering from the University of Iowa Iowa City Iowa in 1969 1970 and 1972 respectively. He has authored numerous papers in the areas of power propulsion and plasma physics and currently is a member of the Aerospace Power Systems Technical Committee of the AIAA. Dr. Swallom has directed various programs for the development of advanced power generation systems lightweight power conditioning systems and advanced propulsion systems for marine applications. His previous experience includes work with Odin International Corporation Maxwell Laboratories Inc. Argonne National Laboratory and the Air Force Aero Propulsion Laboratory. Currently Dr. Swallom is directing the technical efforts to apply magnetohydrodynamic principles to a variety of propulsion and power applications for various marine vehicles and power system requirements respectively. Isaac Sadovnikis a principal research engineer in the Energy Technology Office at Avco Research Laboratory Inc. a subsidiary of Textron Inc. He received his B.S. in engineering (1974) B.S. in physics (1975) M.S. in aeronautics and astronautics (1976) and Ph.D. in physics of fluids (1981) at the Massachusetts Institute of Technology. Dr. Sadovnik has been involved in research work funded by DARPA concerning the use of magnetohydrodynamics for underwater propulsion. He has built theoretical models that predict the hydrodynamic behavior of seawater flow through magnetohydrodynamic ducts and their interaction with the rest of the vehicle (thrust and drag produced). In addition Dr. Sadovnik has been involved in research investigations geared toward the NASP program concerning the use of magnetohydrodynamic combustion-driven accelerator channels. Prior to joining Avco Dr. Sadovnik was a research assistant at MIT where he conducted experimental and

Magnetohydrodynamic propulsion systems for submarines offer several significant advantages over conventional propeller propulsion systems. These advantages include the potential for greater stealth characteristics, increased maneuverability, enhanced survivability, elimination of cavitation limits, greater payload capability, and the addition of a significant emergency propulsion system. These advantages can be obtained with a magnetohydrodynamic propulsion system that is neutrally bouyant and can operate with the existing submarine propulsion system power plant. A thorough investigation of magnetohydrodynamic propulsion systems for submarine applications has been completed. During the investigation, a number of geometric configurations were examined. Each of these configurations and mounting concepts was optimized for maximum performance for a generic attack class submarine. The optimization considered each thruster individually by determining the optimum operating characteristics for each one and accepting only those thrusters that result in a neutrally buoyant propulsion system. The results of this detailed optimization study show that the segmented, annular thruster is the concept with the highest performance levels and greatest efficiency and offers the greatest potential for a practical magnetohydrodynamic propulsion system for attack class submarines. The optimization study results were used to develop a specific point design for a segmented, annular magnetohydrodynamic thruster for an attack class submarine. The design point case has shown that this thruster may be able to provide the necessary thrust to propel an attack class submarine at the required velocity with the potential for a substantial acoustic signature reduction within the constraints of the existing submarine power plant and the maintenance of neutral buoyancy. This innovative magnetohydrodynamic propulsion system offers an approach for submarine propulsion that can be an important contributio

关键词： Ship Propulsion

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