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Communication-less Management Strategy for Electric Vehicle Charging in Droop-controlled Islanded Microgrids

Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1227-1238页

作者： Abdullah azhar al-Obaidi Mohammed Zaki El-Sharafy Hany E.Z.Farag Saifullah Shafiq ali al-Awami Independent Electricity System Operator(IESO) MississaugaCanada Department of Electrical Engineering and Computer Science York UniversityTorontoCanada University of Queensland StLucia QLD 4067Australia Department of Electrical Engineering King Fahd University of Petroleum&MineralsDhahranSaudi Arabia

Adopting high penetration levels of electric vehicles(EVs) necessitates the implementation of appropriate charging management systems to mitigate their negative impacts on power distribution networks. Currently, most of the proposed EV charging management techniques rely on the availability of high-bandwidth communication links. Such techniques are far from realization due to(1) the lack of utility-grade communication systems in many cases such as secondary(low-voltage) power distribution systems to which EVs are connected, rural areas, remote communities, and islands, and(2) existing fears and concerns about the data privacy of EV users and cyber-physical security. For these cases, appropriate local control schemes are needed to ensure the adequate management of EV charging without violating the grid operation requirements. Accordingly, this paper introduces a new communication-less management strategy for EV charging in droop-controlled islanded microgrids. The proposed strategy is autonomous, as it is based on the measurement of system frequency and local bus voltages. The proposed strategy implements a social charging fairness policy during periods when the microgrid distributed generators(DGs) are in short supply by allocating more system capacity to the EVs with less charging in the past. Furthermore, a novel communication-less EV load shedding scheme is incorporated into the management strategy to provide relief to the microgrid during events of severe undervoltage or underfrequency occurrences due to factors such as high loading or DG outages. Numerical simulations demonstrate the superiority of the proposed strategy over the state-of-the-art controllers in modulating the EV charging demand to counteract microgrid instability.

关键词： Charging battery management communication-less control droop control electric vehicle islanded microgrid

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Biotin biosynthesis in Mycobacterium tuberculosis: physiology, biochemistry and molecular intervention

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Protein & Cell 2011年第9期2卷 691-695页

作者： Wanisa Salaemae al azhar Grant W.Booker Steven W.Polyak School of Molecular and Biomedical Sciences University of AdelaideSouth Australia 5005Australia

Biotin is an important micronutrient that serves as an essential enzyme *** obtain biotin either through de novo synthesis or by active uptake from exogenous *** are unusual amongst bacteria in that their primary source of biotin is through de novo *** we review the importance of biotin biosynthesis in the lifecycle of *** screens designed to identify key metabolic processes have highlighted a role for the biotin biosynthesis in bacilli growth,infection and survival during the latency *** studies help to establish the biotin biosynthetic pathway as a potential drug target for new anti-tuberculosis agents.

关键词： synthesis. phase. synthesis

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A　New　Rank　Test　Nonparametric　Procedure　for　Radar　Detection　in　Multiple　Target　Situations

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Journal of Systems Engineering and Electronics 1998年第3期9卷 61-68页

作者： Mohamed B EL Mashade & Abdel Atty Moussa (Electrical Engineering Dept., Faculty of Engineering, al azhar Universityt Nasr City, Cairo, Egypt) Electrical Engineering Dept. Faculty of Engineering Al Azhar University. Nasr City Cairo. Egypt

This paper deals with the detection performance evaluation of a new nonparametric procedure. The test statistics of the proposed processor have a simple statistical form which is derived from that of the suboptimum rank test procedure [1]. The performance of the new distributionfree detection technique is obtained through Monte-Carlo simulations and compared with that of the suboptimum scheme when detecting nonfluctuating target embedded in Gaussian noise and in the presence of interfering target returns among the reference samples. The new nonparametric detector is shown to give a relative improvement over the suboptimum processor, especially, when the background environment contains a numerous-number of extraneous targets.

关键词： Gauss equation Simulation Stability Target recognition radar

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Some Physical Properties of CuTlSe alloy

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Journal of Materials Science & Technology 2001年第2期17卷 229-232页

作者： A.Abdel all Physics Department, Faculty of Science , Helwan University, Cairo, Egypt K.A.Sharaf Physics Department, Faculty of Science, al-azhar University for Girls, Cairo, Egypt A.Elshafie Physics Department, Faculty of Science, Menoufia University, She Dept. of Phys. Faculty of Sci. Helwan Univ. Cairo Egypt

The structure and optical properties of Cu0.1Tl2Se3 alloy was studied. X-ray analysis showed that the polycrystalline powder consists of a mixture of two phases Cu3jTlSe2 (monoclinic) and TISe (tetragonal). Chalcopyrite phase CuTISe2 can be obtained by annealing the powder at 250'C for 1 h. Thin film with a monoclinic phase of Cu3TlSe2 was obtained for the thick film (0.7 um). The optical parameters a, n, k, e' and e' and the energy gap were calculated. The thermoelectric power measurements showed that S has a positive polarity over the whole range of temperature.

关键词： Cu Some Physical Properties of CuTlSe alloy

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X-ray Diffraction and Electrical Conductivity Studies on Ag-Cu-Se System

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Journal of Materials Science & Technology 1995年第1期11卷 53-55页

作者： S.N.Motafa and S.R.Selim(Chemistry Department, al-azhar University, Nasr City. Cairo. Egypt)F.M.Ismail(Inorganic Chemistry Department, National Research Center. Dokki. Cairo. Egypt) NATL RES CTR DEPT INORGAN CHEMCAIROEGYPT al-azhar UNIV DEPT CHEMNASREGYPT

A number of X-ray patterns and electrical conductivities of five different samples of Ag-Cu-Se system have been measured. These samples of Ag-Cu-Se system: (Ag1.188, Cu0.812)Se, (Ag,Cu)Se; (Ag0.9, Cu1.1 )Se, (Ag0.8, Cu1.2)Se and (Ag0.6, Cu1.4)Se were prepared under controlled conditions. Analysis of the experimental data shows that Frenkel defects are predominated in (Ag1.188, Cu0.812)Se and Schottky defects prevailing in the other samples. The activation energy values △E calculated from the linear behaviour of electrical conductivity a with temperature (0-90℃) reveal that the impurity content increases in the direction of (Ag,Cu)Se→(Ag0.8,Cu1.2 )Se

关键词： Ag X-ray Diffraction and Electrical Conductivity Studies on Ag-Cu-Se System Cu

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COUPLE-STRESSES IN PERISTalTIC TRANSPORT OF FLUIDS

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生物数学学报 1994年第1期9卷 1-14页

作者： ELSAYED F.EL SHEHAWEY MEKHEIMER,KH.S.(Department of Mathematics,Faculty of Education,Ain Shams University,Heliopolis,Cairo,Egypt.)(Department of Mathematics, Faculty of Science (Men),al-azhar University,Naser City,Cairo,Egypt.) Ain Shams University 埃及 al-azhar University 埃及

Peristaltic pumping by a sinusoidal traveling wave in the walls of a two-dimensional channel field with a viscous incompressible couple-stress fluid, is investigated theoretically. A perturbation solution is obtained which satisfies the momentum equation for the case in which the amplitude ratio (wave amplitude/channel half width) is small. The results show that the mean axial velocity decreases with increasing the couple-stress parameter η. The phenomenon of reflux (the mean flow reversal) is discussed. A reversal of velocity in the neighborhood of the centerline and at the boundaries occurs. Numerical results are reported for various values of the physical parameters of interest.

关键词： Reynolds Cambridge Blood ASME Weinberg

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On the Current and Restoration Conditions of the Southern Iraqi Marshes: Application of the CCME WQI on East Hammar Marsh

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Journal of Environmental Protection 2011年第3期2卷 316-322页

作者： azhar al-Saboonchi Abdul-Razak M. Mohamed Abdul Hameed M. Jawad alobaidy Haider S. Abid Bahram K. Maulood 不详

Water quality of the East Hammar marsh after restoration was assessed by using the Canadian Council of Ministers of the Environment Water Quality Index (CCME WQI).The model was applied in two approaches based on the historical data and the CCME aquatic life guidelines as objectives. Variables included in the index calculation were Water Temperature, Dissolved Oxygen, Salinity, pH value, Total Nitrogen, Ammonia, Nitrate, Phosphorus and Sodium. The CCME WQI analysis in both approaches reflected that water quality of the East Hammar marsh is rated as poor based on 2005-2006 data, meaning that the conditions of the marsh are often depart from natural or desirable levels particularly in respect to sodium and nitrogenous compounds;it simply has not recovered yet. The results reflect that the marsh area is still far from the current guideline criteria and, too far from restoration.

关键词： WQI Iraqi Marshes Restoration Nature Iraq

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Status and prospects for symmetric organic redox flow batteries

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Journal of Energy Chemistry 2025年第1期100卷 125-143页

作者： Md al Raihan C.Adam Dyker Department of Chemistry University of New Brunswick

As environmental concerns from fossil fuel consumption intensify, large-scale energy storage becomes imperative for the integration of renewable sources like wind, hydro, and solar with the electrical *** flow batteries, particularly those employing organic molecules, are positioned as a key technology for this purpose. This review explores the growing field of symmetric organic redox flow batteries(ORFBs) within this context. Unlike traditional asymmetric designs based on unique active materials for each electrode, symmetric ORFBs involve a single bipolar species for both electrodes. This review highlights the benefits of a symmetric design, and categorizes five distinct classes of organic bipolar molecules used in both aqueous and non-aqueous solvents. By providing a comprehensive overview of their cell cycling and performance characteristics, the strengths and weaknesses of the diverse categories of bipolar molecules are highlighted for both solvent systems, as are opportunities for future development. This should guide new research directions and advance the development of practical symmetric ORFBs.

关键词： Redox flow battery Symmetric battery Organic battery Aqueous electrolyte Non-aqueous electrolyte

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EXACT ANalYSIS OF OS MODIFIED VERSIONS WITH NONCOHERENT INTEGRATION

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Journal of Electronics(China) 2004年第4期21卷 265-277页

作者： Mohamed B.El Mashade Electrical Engineering Dept Faculty of Eng.Al Azhar Univ.Nasr CityCairoEgypt

This paper deals with the exact detection analysis of the Ordered-Statistic(OS) processor along with OS Greatest Of(OSGO) and OS Smallest Of(OSSO) modified versions, for M postdetection integrated pulses when the operating environment is nonhomogeneous. Analytical results are presented in multiple-target case as well as in regions of clutter power transitions. The primary and the secondary interfering targets are assumed to be fluctuating in accordance with the SWII target fluctuation model. As the number of noncoherently integrated pulses increases,lower threshold values and consequently better detection performances are obtained in both homogeneous and multiple target background models. However, the false alarm rate performance of OSSO-CFAR(Constant False alarm Rate) scheme at clutter edges is worsen with increasing the postdetection integrated pulses. As predicted, the OSGO-CFAR detector accommodates the presence of spurious targets in the reference window, given that their number is within its allowable range in each local window, and controls the rate of false alarm when the contents of the reference cells have clutter boundaries.

关键词： Adaptive radar detectors Ordered-Statistic(OS) modified versions Interfering targets Clutter boundaries Postdetection integration

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Nanosecond pulse and dual-wavelength Q-switched 1.5 μm fiber laser using MAX phase Cr2TialC2 saturable absorber

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Optoelectronics Letters 2025年第1期21卷 7-12页

作者： Ahmed Shakir al-HITI Hiba HASSAN Department of Electrical Engineering Faculty of Engineering University of Anbar Department of Laser and Optoelectronics Engineering University of Technology-Iraq

We demonstrated a new type of MAX phase material, chromium titanium aluminum carbide（Cr2TialC2） polymer film, to generate a passively Q-switched erbium-doped fiber laser（EDFL）. The film thickness was measured to be around 45 μm, which was fabricated using the embedding method with polyvinyl alcohol（PVA） polymer as hoster. The saturable absorber（SA） film demonstrates a dual-wavelength passively Q-switched EDFL which operates at 1 531 nm and 1 560.19 nm, respectively. The Q-switching pulse duration could be varied from 2.46 μs to 770 ns, while the repetition rate varied from 92.76 kHz to 106.6 kHz with an increasing input pumping range from 154 mW to 300 mW. The maximum output power and pulse energy of 15.05 mW and 141.18 nJ were obtained at the maximum input power of 300 mW, respectively.

关键词： Saturable absorbers

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