Load Control between PV Power Plants and Diesel Generators

Mohamed Khalil Abdalla MohamedAli,AISHA HASSAN ABDALLA HASHIM,OTHMAN KHALIFA International Journal of Computer ScienceNetwork S 2024 International journal of computer science and netw Vol.24 No.6

Introducing renewable energy sources, such as wind and photovoltaic arrays, in microgrids that supply remote regions with electricity represents a significant leap in electricity generation. Combining photovoltaic panels and diesel engines is one of the most common ways to supply electricity to rural communities. Such hybrid systems can reduce the cost of electricity generation in these remote power systems because they use free energy to balance the power generated by diesel engines. However, the combination of renewable energy sources and diesel engines tends to complicate the sizing and control of the entire system due to the intermittent nature of renewable energy sources. This study sought to investigate this issue in depth. It proposes a robust hybrid controller that can be used to facilitate optimum power sharing between a PV power source and diesel generators based on the dynamics of the available PV energy at any given time. The study also describes a hybrid PV-diesel power plant's essential functional parts that produce electricity for a microgrid using a renewable energy source. Power control needs to be adjusted to reduce the cost of power generation.

Advancing Human-Robot Interaction: Real-Time Navigation Guidance Using Language Models

Abdalla Hisham,이덕진 제어로봇시스템학회 2024 제어로봇시스템학회 국내학술대회 논문집 Vol.2024 No.7

Use Efficiency of Some Soil Amendments and Unconventional Irrigation Water on Improving Properties and Productivity of Sodic Soil

Abdalla Mohamedin 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

The effect of immediate neoadjuvant electromotive instillation of mitomycin C with Bacillus Calmette–Guérin versus BCG alone in non-muscle-invasive bladder cancer: A randomized controlled trial

Abdalla El Azab,Ahmed Abd Elbary,Aly El Faqeh M. Okasha,Hatem Aboulkassem,Ashraf Saad Zaghloul,Riham Mohamed Karkeet,Ibrahim Abdelrahman 대한비뇨의학회 2023 Investigative and Clinical Urology Vol.64 No.6

Purpose: The clinical effect of neoadjuvant intravesical instillation of chemotherapy immediately before transurethral resection of bladder tumors (TURBT) has been a subject of recent research. The aim of this study was to assess the effect of immediate neoadjuvant electromotive instillation of mitomycin C before transurethral resection for patients with non-muscle-invasive urothelial bladder cancer. Materials and Methods: Our study was a randomized clinical trial carried out on 50 patients diagnosed with non-muscle-invasive urothelial bladder cancer. Patients were classified into two groups: Group I consisted of 25 patients who received neoadjuvant electromotive drug administration of mitomycin C before TURBT and intravesical bacille Calmette–Guerin (BCG) per week for 6 weeks; Group II consisted of 25 patients who were treated with TURBT followed by intravesical BCG per week for 6 weeks alone (standard of care). Patients were followed up at 3, 6, 12, and 18 months by cystoscopy. Results: Patients who received neoadjuvant electromotive drug administration of mitomycin C before TURBT in combination with BCG had a low recurrence rate compared with those who received BCG alone (12.0% vs. 48.0%, respectively; p=0.012) and a longer disease-free interval (88.0% vs. 52.0%, respectively; p=0.012). Four patients developed progression to muscle-invasive disease (16.0%) in the BCG alone group. However, this difference was not statistically significant (p=0.516). Regarding adverse effects, there were no statistically significant differences between the groups. Conclusions: Neoadjuvant intravesical electromotive drug administration of mitomycin C before TURBT is safe; reduces recurrence rates and enhances the disease-free interval compared with TURBT followed by BCG alone.

Effect of thickness and reinforcement on concrete plates under high speed projectiles

Abdalla S. Tais,Omer F. Ibraheem,Saad M. Raoof 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.82 No.5

Behavior of concrete elements under the effect of high-speed projectiles has gain increasing interest recently. It’s necessary to understand how far the concrete can absorb the effect of bullets in order to save the occupants when design security and military infrastructures. This study presents a total of 18 concrete slabs casted and tested under reinforcement ratios, 0%, 0.35% and 0.7%. Parameters interested were slab thickness, (50 mm, 100 mm, and 150 mm) and type of weapon. All specimens tested to investigate their response under the effect of attacking by two common types of weapon. In general, it was found that projectile penetration was controlled by their thickness regardless the steel reinforcement ratio. However, the steel reinforcement controls the damage.

EMBEDDING RIEMANNIAN MANIFOLDS VIA THEIR EIGENFUNCTIONS AND THEIR HEAT KERNEL

Abdalla, Hiba Korean Mathematical Society 2012 대한수학회보 Vol.49 No.5

In this paper, we give a generalization of the embeddings of Riemannian manifolds via their heat kernel and via a finite number of eigenfunctions. More precisely, we embed a family of Riemannian manifolds endowed with a time-dependent metric analytic in time into a Hilbert space via a finite number of eigenfunctions of the corresponding Laplacian. If furthermore the volume form on the manifold is constant with time, then we can construct an embedding with a complete eigenfunctions basis.

A geometrically nonlinear thick plate bending element based on mixed formulation and discrete collocation constraints

Abdalla, J.A.,Ibrahim, A.K. Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.6

In recent years there are many plate bending elements that emerged for solving both thin and thick plates. The main features of these elements are that they are based on mix formulation interpolation with discrete collocation constraints. These elements passed the patch test for mix formulation and performed well for linear analysis of thin and thick plates. In this paper a member of this family of elements, namely, the Discrete Reissner-Mindlin (DRM) is further extended and developed to analyze both thin and thick plates with geometric nonlinearity. The Von K$\acute{a}$rm$\acute{a}$n's large displacement plate theory based on Lagrangian coordinate system is used. The Hu-Washizu variational principle is employed to formulate the stiffness matrix of the geometrically Nonlinear Discrete Reissner-Mindlin (NDRM). An iterative-incremental procedure is implemented to solve the nonlinear equations. The element is then tested for plates with simply supported and clamped edges under uniformly distributed transverse loads. The results obtained using the geometrically NDRM element is then compared with the results of available analytical solutions. It has been observed that the NDRM results agreed well with the analytical solutions results. Therefore, it is concluded that the NDRM element is both reliable and efficient in analyzing thin and thick plates with geometric non-linearity.

Performance Evaluation for a Unicast Vehicular Delay Tolerant Routing Protocol Networks

Abdalla, Ahmed Mohamed International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.2

Vehicular Ad hoc Networks are considered as special kind of Mobile Ad Hoc Networks. VANETs are a new emerging recently developed, advanced technology that allows a wide set of applications related to providing more safety on roads, more convenience for passengers, self-driven vehicles, and intelligent transportation systems (ITS). Delay Tolerant Networks (DTN) are networks that allow communication in the event of connection problems, such as delays, intermittent connections, high error rates, and so on. Moreover, these are used in areas that may not have end-to-end connectivity. The expansion from DTN to VANET resulted in Vehicle Delay Tolerant Networks (VDTN). In this approach, a vehicle stores and carries a message in its buffer, and when the opportunity arises, it forwards the message to another node. Carry-store-forward mechanisms, packets in VDTNs can be delivered to the destination without clear connection between the transmitter and the receiver. The primary goals of routing protocols in VDTNs is to maximize the probability of delivery ratio to the destination node, while minimizing the total end-to-end delay. DTNs are used in a variety of operating environments, including those that are subject to failures and interruptions, and those with high delay, such as vehicle ad hoc networks (VANETs). This paper discusses DTN routing protocols belonging to unicast delay tolerant position based. The comparison was implemented using the NS2 simulator. Simulation of the three DTN routing protocols GeOpps, GeoSpray, and MaxProp is recorded, and the results are presented.

Effect of Diameters and Alkali Treatment on the Tensile Properties of Date Palm Fiber Reinforced Epoxy Composites

Abdalla Abdal-hay,임재규,Ngakan Putu Gede Suardana,정도연,최광석 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.7

Natural fibers as reinforced polymer composites have recently been the center of attention among researchers. Surface modifications and variations in the fiber diameters are major factors that influence the fiber adhesion performance inside the matrix. Experiments have been performed to further the development of natural fiber reinforced polymers as a replacement for glass fibers. In the present research, date palm fibers (DPFs) with three different size ranges of diameters (800-600, 600-400, and 400-200 μm) and the influence of alkali treatment on their characteristics have been investigated. Morphology observations (SEM), EDS density mapping (quantitative elemental analysis), X-RD, and FTIR spectroscopy of treated and untreated fibers were carried out. In addition, the tensile properties of a single fiber and composites consisting of fibers/epoxy with discontinuous random oriented short fibers both with and without chemical modification were studied. The results showed that DPFs are amenable to chemical modification particularly in the fine fiber case. It was found that the ultimate tensile strength and percentage elongation of a single fiber after alkali treatment increased by 57% and 24.7 %,respectively. Because alkali treatment of the DPFs was able to provide a good adhesion within the matrix, the tensile strength, elastic modulus and the fiber-matrix interaction of the composite were improved. Collectively, the addition of the proposed DPFs may open a new avenue for the exploitation of this natural cheap material to produce a green composite.

The Modification of Rice Husk Derived Bio Char with AlCl3 for Removal of Fluoride from Groundwater

( Abdalla Mussa Juma. Prof ),( Seong-jik Park ) 한국농공학회 2020 한국농공학회 학술대회초록집 Vol.2020 No.-

The problem of high amount of fluoride in groundwater is commonly in the worldwide. Many researchers and scholars with different techniques was tried dealing with that problem so as to solve it. Different parameters affecting efficiency of fluoride removal such as adsorbent dose, the time of contact, temperatures conditions, fluoride concentration, pH solution and ions concentrations were considered. Groundwater was used to test the performance of the adsorbent under the optimum conditions. Equilibrium data are well expressed by Freundlich isotherm models and Langmuir, so as to Compared to the adsorption characteristics of fluoride on Aluminum chloride. The pseudo first order and pseudo second order were also applied in comparison. While the pseudo second-order model is found to be more suitable than the pseudo first-order to the fluorides adsorption description. It is observed that, under the optimum conditions the use of aluminum chloride with modified rice husk bio char are maximum in fluoride removal, which indicated that aluminum chloride-modified bio char can be used efficiently as adsorbents for the fluoride removal. The aluminum chloride-modified bio char derived from rice husk were used to treat the fluoride obtained from groundwater.