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Mohamed Taha

Bio: Mohamed Taha is an academic researcher from Cairo University. The author has contributed to research in topics: Serotype & AC power. The author has an hindex of 2, co-authored 2 publications receiving 12 citations.

Papers
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Journal ArticleDOI
TL;DR: A complete model for the integration between the Photovoltaic Distributed Generation System (PV-D GS) and the utility grid is simulated by MATLAB/SIMULINK to provide active power of a given feeder and to improve the output power quality from the PV-DGS unit.
Abstract: In this work, a complete model for the integration between the Photovoltaic Distributed Generation System (PV-DGS) and the utility grid is simulated by MATLAB/SIMULINK. The aims of this study are to provide active power of a given feeder and to improve the output power quality from the PV-DGS unit. To achieve these aims, Two PV-arrays with total power yield equal to 200 KW are modeled. The maximum power point tracking based on the perturb and observe technique is used to control the DC-DC converter. The voltage source converter is controlled to allow the system to operate in different modes. These modes are the unity output power factor and the reactive power compensation. Different control techniques have been applied including the conventional PI controller as well as the intelligent optimization tuning. A complete comparison between both techniques has been introduced and analyzed.

14 citations

Journal ArticleDOI
01 Jul 2019
TL;DR: The outcomes of this study revealed that the infection of H9N2 with E.coli can exacerbate the clinical outcomes and mortality rates which leads to higher economic losses in chicken flocks.
Abstract: The work was implemented to evaluate the pathogenicity of H9N2 when co-infected with the E.coli. Avian influenza H9N2 virus strain A/chicken/Egypt/1618F/2016 which was isolated from Luxor province during 2016 and E.coli serotype O78 were used in this research. Sixty SPF birds were divided into 6 groups of ten birds each. At age 21 days, group 1 was inoculated with H9N2 only, group 2 received E.coli and three days later received H9N2, group 3 inoculated with H9N2 and after three days received E.coli, group 4 was challenged with E.coli and H9N2 at the same time, group 5 was inoculated with E.coli only, and group 6 was designed as a negative group. Clinical signs, postmortem examination, and serological examination were monitored for 15 days. The H9N2 virus presence was assessed in tracheal and cloacal swabs using real-time PCR. The most severe signs and lesions were observed in groups (3, and 4), with also high mortality rate than other groups with a percentage of 20%. Groups 3, and 4 showed a longer duration in virus shedding in the tracheal and cloacal samples. The hemagglutination inhibition test, group 4 showed high HI antibody titer against AIV-H9N2 antigen than other groups, while group 2 showed the lowest HI antibody titer against AIV-H9N2 antigen than other groups that received only the H9N2 virus. In conclusion, the outcomes of this study revealed that the infection of H9N2 with E.coli can exacerbate the clinical outcomes and mortality rates which leads to higher economic losses in chicken flocks.

2 citations


Cited by
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01 Sep 2010

2,148 citations

Journal ArticleDOI
01 Mar 1941-Nature
TL;DR: In this article, Gray has written a book on diseases of poultry, Diseases of Poultry Their Aetiology, Diagnosis, Treatment and Control; with a Section on the Normal Anatomy and Physiology of the Fowl.
Abstract: VERY few veterinary surgeons have thought fit to write a book on diseases of poultry. Mr. Ernest Gray has done justice to the subject and is to be congratulated on his effort. A book of this size, written by one with specialized knowledge, will add to the value of any library or private bookshelf. Diseases of Poultry Their Aetiology, Diagnosis, Treatment and Control; with a Section on the Normal Anatomy and Physiology of the Fowl. By Ernest Gray. (Lockwood's Agricultural and Horticultural Handbooks.) Pp. x + 198 + 16 plates. (London: Crosby Lockwood and Son, Ltd., 1940.) 9s. 6d. net.

1,282 citations

Journal ArticleDOI
TL;DR: In this paper , the challenges reported due to the grid integration of solar PV systems and relevant proposed solutions are reviewed and discussed, including non-dispatchability, power quality, angular and voltage stability, reactive power support, and fault ride-through capability related to solar PV system grid integration.
Abstract: World leaders and scientists have been putting immense efforts to strengthen energy security and reducing greenhouse gas (GHG) emissions by meeting growing energy demand for the last couple of decades. Their efforts accelerate the need for large-scale renewable energy resources (RER) integration into existing electricity grids. The intermittent nature of the dominant RER, e.g., solar photovoltaic (PV) and wind systems, poses operational and technical challenges in their effective integration by hampering network reliability and stability. This article reviews and discusses the challenges reported due to the grid integration of solar PV systems and relevant proposed solutions. Among various technical challenges, it reviews the non-dispatch-ability, power quality, angular and voltage stability, reactive power support, and fault ride-through capability related to solar PV systems grid integration. Also, it addresses relevant socio-economic, environmental, and electricity market challenges. Finally, it highlights the proposed solution methodologies, including grid codes, advanced control strategies, energy storage systems, and renewable energy policies to combat the discussed challenges. The findings of this article assist the power system scholars and researchers in conducting further research in this field. Furthermore, it helps the decision-makers to choose the appropriate technologies to deal with the anticipated challenges associated with the grid integration of PV systems.

35 citations

Journal ArticleDOI
TL;DR: In this article , the challenges reported due to the grid integration of solar PV systems and relevant proposed solutions are reviewed and discussed, including non-dispatchability, power quality, angular and voltage stability, reactive power support, and fault ride-through capability related to solar PV system grid integration.
Abstract: World leaders and scientists have been putting immense efforts into strengthening energy security and reducing greenhouse gas (GHG) emissions by meeting growing energy demand for the last couple of decades. Their efforts accelerate the need for large-scale renewable energy resources (RER) integration into existing electricity grids. The intermittent nature of the dominant RER, e.g., solar photovoltaic (PV) and wind systems, poses operational and technical challenges in their effective integration by hampering network reliability and stability. This article reviews and discusses the challenges reported due to the grid integration of solar PV systems and relevant proposed solutions. Among various technical challenges, it reviews the non-dispatch-ability, power quality, angular and voltage stability, reactive power support, and fault ride-through capability related to solar PV systems grid integration. Also, it addresses relevant socio-economic, environmental, and electricity market challenges. Finally, it highlights the proposed solution methodologies, including grid codes, advanced control strategies, energy storage systems, and renewable energy policies to combat the discussed challenges. The findings of this article assist the power system scholars and researchers in conducting further research in this field. Furthermore, it helps the decision-makers to choose the appropriate technologies to deal with the anticipated challenges associated with the grid integration of PV systems.

34 citations

Journal ArticleDOI
TL;DR: The design and hardware implementation of an adaptive nonlinear controller for fast, robust, and stable control of single-phase shunt active power filter and the switching loss estimation is introduced in BSC using design estimation rules to enhance the dc-link loss compensation capability.
Abstract: This article presents the design and hardware implementation of an adaptive nonlinear controller for fast, robust, and stable control of single-phase shunt active power filter. The proposed control system consists of two control loops: an inner harmonic current compensation loop and an outer dc-voltage control loop. The inner loop is realized using self tuning filter based instantaneous power theory (pq theory). The limitations of conventional low-pass filter based fundamental component extraction methods are overcome using self-tuning filter. The outer loop is realized backstepping controller (BSC). The limitations observed in existing dc-link voltage controllers like poor stability margin, steady state error, chattering problem, etc., are overcome by the proposed BSC. The switching loss estimation is introduced in BSC using design estimation rules to enhance the dc-link loss compensation capability. The stability of the system with the proposed controller is studied using Barbalat lemma. A laboratory prototype of BSC based shunt active power filter is implemented. The control algorithm is implemented in a single all on chip field programmable gate array (FPGA). To ensure the effectiveness of the controller in mitigating the harmonic currents and controlling dc-link voltage, the control algorithm is tested under steady state and dynamic conditions.

24 citations