Faculty Of Engineering Research Paper

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1 of 1 Experimental and FE simulations of ferrocement columns incorporating composite materials
(TECHNO-PRESS, 2017) Shaheen, Yousry B. I.; Mahmoud, Ashraf M.; Refat, Hala M.
This paper presents a proposed method for producing reinforced composite concrete columns reinforced with various types of metallic and non metallic mesh reinforcement. The experimental program includes casting and testing of twelve square columns having the dimensions of 100 mmx100 mmx1000 mm under concentric compression loadings. The test samples comprise all designation specimens to make comparative study between conventionally reinforced concrete column and concrete columns reinforced with welded steel mesh, expanded steel mesh, fiber glass mesh and tensar mesh. The main variables are the type of innovative reinforcing materials, metallic or non metallic, the number of layers and volume fraction of reinforcement. The main objective is to evaluate the effectiveness of employing the new innovative materials in reinforcing the composite concrete columns. The results of an experimental investigation to examine the effectiveness of these produced columns are reported and discussed including strength, deformation, cracking, and ductility properties. Non-linear finite element analysis; (NLFEA) was carried out to simulate the behavior of the reinforced concrete composite columns. The numerical model could agree the behavior level of the test results. ANSYS-10.0 Software. Also, parametric study is presented to look at the variables that can mainly affect the mechanical behaviors of the model such as the change of column dimensions. The results proved that new reinforced concrete columns can be developed with high strength, crack resistance, and high ductility properties using the innovative composite material
A 10-Step Design Process for Architectural Design Studios
(Springer Nature, 2020) Abdelhamid, T.G.
In most architectural schools, Design Studios Architectural design is usually a process in which there is no clear methodology or scientific step-by-step process that should lead the student to a design acceptable to his instructors. This paper suggests a systematic method that reduces studio design to a clear process that should lead to what can be a better design output in a shorter time. This method is for beginner to intermediate level design studios. We will first describe and analyse the issue, then we will explain the proposed process in detail, then a brief report is given on implementation in five different case studies, ending with recommendations on how to make the best use of the process. © 2020, Springer Nature Switzerland AG.
2-Killing vector fields on warped product manifolds
(WORLD SCIENTIFIC PUBL CO PTE LTD, 2015) Shenawy, Sameh; Unal, Bulent
This paper provides a study of 2-Killing vector fields on warped product manifolds as well as characterization of this structure on standard static and generalized Robertson-Walker space-times. Some conditions for a 2-Killing vector field on a warped product manifold to be parallel are obtained. Moreover, some results on the curvature of a warped product manifolds in terms of 2-Killing vector fields are derived. Finally, we apply our results to describe 2-Killing vector fields of some well-known warped product space-time models.
22 circularly polarized MIMO antenna at Ka-band for fifth generation applications
(Praise Worthy Prize S.r.l, 2019) Ibrahim M.S.; College of Engineering; Prince Sultan University; Riyadh; Saudi Arabia; College of Engineering; Modern Sciences and Arts University; Egypt
In this paper, two ports Circularly Polarized (CP) multiple-input multiple-output (MIMO) Square Microstrip Patch Antenna (SMPA) at Ka-band is developed. The proposed antenna is designed in order to resonate at 28 GHz (Ka-band) which is suitable for fifth generation (5G) applications. CP is realized by introducing two corners truncation with V-shaped slot of the square patch. The presence of the V-slot has improved the impedance bandwidth of the proposed antenna. The analysis and the optimization processes throughout this paper are carried out using Finite Element Method (FEM) and Finite Integration Technique (FIT). Single element and two elements corporate fed array are fabricated and their scattering matrices have been measured. A good agreement between simulated and measured data is obtained. An equivalent circuit model for the proposed two port MIMO array with circuit element values is introduced. The total efficiency of the proposed MIMO antenna is higher than 85% along the entire bandwidth. The proposed design covers 26.55 29.2 GHz (9.4%) frequency band with more than 34 dB isolation between the two ports along that frequency band. Hence, the proposed antenna performance makes it a good candidate for the 5G applications at millimeter wave frequency. 2019 Praise Worthy Prize S.r.l.-All rights reserved.
3-D full wave analysis using spectral domain method of moments for a ferrite ceoss-patch antenna
(2007) Elshafiey T.M.F.; October University for Modern Sciences and Arts; MSA; 14 Amer St. off El Messaha Square; Dokki; Cairo; Egypt
This paper-describes the 3-D analysis using spectraldomain Method of Moments, MoM, of cross - patch antennas on ferrite substrates and compares its: radar cross section (RCS) with respect to the full - patch antenna. The direction of the dc magnetization of the ferrite is assumed arbitrarily in ? and ?. The Greens function and the excitation vector are formulated in a closed form using, the transmission matrix approach. The linearly-varying basis function is used. In general, we notice that the first resonance is almost at the same frequency for both patches, the cross and the full. The cross patch excites less number of modes than the case of full patch. The: RCS level is reduced. This reduction might be due to the less number of modes and/or the smaller physical area for the cross-patch element.
A Compact Dual-Band ACS-Fed Frequency Independent Hook Loop Antenna for WLAN Applications
(Taylor and Francis Ltd., 2024-10-02) Arvind Kumar; Praveen V. Naidu; Mohamed El Atrash; Vinay Kumar; Mahmoud A. Abdalla
Presented in this paper is a simple, small-sized, and hook-shaped monopole antenna fed by an Asymmetric Coplanar Strip (ACS) for different dual-band operations. The antenna operates at 3.5 and 5.2 GHz; hence, serving WiMAX and WLAN applications. Dual resonances were attained by integrating a quarter-wavelength strip with a C-shaped half-wavelength loop strip. The proposed antenna footprint is 20 × 7.9 mm2. Based on the achieved outcomes and the antenna compactness, it can be highly nominated for use in 3.5/5 GHz wireless communications applications and wireless gadgets.
A Comprehensive Review and Mapping Citrus Supply Chains from a Sustainability Perspective across the European Union, Middle East, and Africa
(MDPI, 2024-10) Sherin Beshara; Ahmed Kassem; Hadi Fors; Nermine Harraz
Citrus fruits are among the most produced and traded agricultural products worldwide, with significant economic and social importance. Despite their importance in the European Union, Middle East, and Africa, the existing literature is limited. Several studies have reviewed different aspects of general agri-food supply chains, but a product-based literature review on citrus supply chains has not been conducted. This paper provides a comprehensive review of the citrus supply chain in these regions, identifying the key research topics, methodologies, and supply chain echelons addressed in the literature. The study employed a systematic review, real-world case studies, and supply chain stakeholders’ interviews. This multi-faceted approach allows researchers to highlight research gaps, map a complete citrus supply chain, and provide a detailed material flow and sustainability-oriented overview of potential inputs and outputs at different stages. By incorporating real-world case studies and stakeholder interviews, this paper offers a nuanced and practical perspective on the operational and sustainability challenges unique to the citrus supply chain. This study serves as a guide for future research and enables practitioners to pinpoint areas and strategies for operational improvement across the supply chain.
Absence of exponential sensitivity to small perturbations in nonintegrable systems of spins 1/2
(American Physical Society, 2014) V. Fine, Boris; A. Elsayed, Tarek; M. Kropf, Chahan; S. de Wijn, Astrid
We show that macroscopic nonintegrable lattices of spins 1/2, which are often considered to be chaotic, do not exhibit the basic property of classical chaotic systems, namely, exponential sensitivity to small perturbations. We compare chaotic lattices of classical spins and nonintegrable lattices of spins 1/2 in terms of their magnetization responses to imperfect reversal of spin dynamics known as Loschmidt echo. In the classical case, magnetization exhibits exponential sensitivity to small perturbations of Loschmidt echoes, which is characterized by twice the value of the largest Lyapunov exponent of the system. In the case of spins 1/2, magnetization is only power-law sensitive to small perturbations. Our findings imply that it is impossible to define Lyapunov exponents for lattices of spins 1/2 even in the macroscopic limit. At the same time, the above absence of exponential sensitivity to small perturbations is an encouraging news for the efforts to create quantum simulators. The power-law sensitivity of spin 1/2 lattices to small perturbations is predicted to be measurable in nuclear magnetic resonance experiments.
AN ACCURATE NUMERICAL TECHNIQUE FOR SOLVING FRACTIONAL OPTIMAL CONTROL PROBLEMS
(EDITURA ACAD ROMANE, 2015-03) Abdelkawy, M. A; Ezz-Eldien, S. S; Baleanu, D; Doha, E. H; Bhrawy, A. H
In this article, we propose the shifted Legendre orthonormal polynomials for the numerical solution of the fractional optimal control problems that appear in several branches of physics and engineering. The Rayleigh-Ritz method for the necessary conditions of optimization and the operational matrix of fractional derivatives are used together with the help of the properties of the shifted Legendre orthonormal polynomials to reduce the fractional optimal control problem to solving a system of algebraic equations that greatly simplifies the problem. For confirming the efficiency and accuracy of the proposed technique, an illustrative numerical example is introduced with its approximate solution.
Acoustic Energy Conversion into Useful Electric Energy from Disk Jockey by Using Piezoelectric Ttransducers
(IEEE, 2016) Selim, Kyrillos K.; Haggag, Ayman; Yehia, H. M.; Amer, Fathy Z.; El-Garhy, Ahmed M.
In this study a new noise source is proposed as a one of renewable energy sources in energy harvesting. Disk Jokey (DJ) is a common device in celebrations and other events. Converting the produced noise from DJ to electric energy by using a suitable piezoelectric transducer is the main aim of this study. Piezoelectric sensors are used to convert the sound waves to electric charges. Piezoelectric sensor of the model 7BB-41-2 is used in this study. The piezoelectric sensors are connected in series, parallel, and hybrid combination connections. The disk jockey is used as an acoustic noise source. The sound intensity levels of the output sound are 81, 84, 87 dB. The output of the three connection modes are measured at 0, 1,2,3,4, and 5cm distance. The results showed that the parallel connection gave the highest power at the various distances. The maximum generated power is 4.96m watts without using an external power supply for the signal condition device. The power decreases by increasing the distance from the source of the noise.
Activate the CQDDR Role for Improving Throughput over IEEE 802.15.1 Wireless Links
(IEEE, 2012) El-Bendary, M. A. M. M.; Haggag, A.; Kazemian, H. B.
Channel Quality Driven Data Rate (CQDDR) play main role in the throughput factor over IEEE 802.15.1 Bluetooth network. CQDDR is employed to selects the packet size by Received Signal Strength Indicator (RSSI) over Bluetooth network according to channel conditions. This paper tries to improve the throughput over Bluetooth system in classic and Enhanced Data Rate (EDR) packets. The paper studies the adaptive Bluetooth packet format according to CQDDR decision which determines when it can extend the payload (PL) of transmitted packets. This paper proposes transmitting uncoded Access Code (AC) and the header (HD) as optional packets type. Many of proposed packets format are studied in additive White Gaussian Noise (AWGN) and fading channels. Our simulation experiments reveal the capability of extension the PL length by 8 bytes for classic BT and 16 bytes for EDR BT. Also, the experiments reveal ineffectiveness of error control schemes of AC and HD in the case of uncoded packets (DH1). That means in good channel condition the redundant bits can be added to exceed the length of the PL.
Active Control of a Rectangular Thin Plate Via Negative Acceleration Feedback
(ASME, 2016) Bauomy, H. S; El-Sayed, A. T
In this paper, the dynamic oscillation of a rectangular thin plate under parametric and external excitations is investigated and controlled. The motion of a rectangular thin plate is modeled by coupled second-order nonlinear ordinary differential equations. The formulas of the thin plate are derived from the von Karman equation and Galerkin's method. A control law based on negative acceleration feedback is proposed for the system. The multiple time scale perturbation technique is applied to solve the nonlinear differential equations and obtain approximate solutions up to the second-order approximations. One of the worst resonance case of the system is the simultaneous primary resonances, where Omega(1) congruent to omega(1) and Omega(2) congruent to omega(2). From the frequency response equations, the stability of the system is investigated according to the Routh-Hurwitz criterion. The effects of the different parameters are studied numerically. It is also shown that the system parameters have different effects on the nonlinear response of the thin plate. The simulation results are achieved using MATLAB 7.0 software. A comparison is made with the available published work.
Adapting the Concept of Courtyard in Long-Narrow Attached Houses as a Sustainable Approach: The Saudi Experiment
(GET IT PUBLISHED VERLAG E K, 2015-08) Abdelsalam, Tarek
Studying and investigating the concept of courtyard in residential buildings in contemporary Arab architecture allows the distinctive nature of tradition to be reinterpreted in the context of the contemporary era. Although most Arab people link the courtyard house with the traditional lifestyle, an increasing number are keen to see the courtyard typology adapted to modern needs. At this point, critical research questions are raised; how can we adapt the courtyard typology to modern needs, what design principles should be followed, and what are the likely urban consequences. This paper attempts to answer the previous questions and address the issue of adapting the courtyard concept in the long-narrow attached houses as a sustainable approach for hot arid regions. To tackle the research problem and answer its questions, a Saudi experiment of two contemporary courtyard housing projects will be analysed, investigated and discussed. Saudi Arabia is one of few countries in the world where most people still adhere to a strictly traditional way of life whilst at the same time having the wealth to possess advanced means of technology. Through the selected two projects the concept of courtyard will be examined and assessed in the long-narrow attached houses to set design principles and guidelines that could be followed in dealing with the issue of courtyard in contemporary residential buildings in the region. The paper discusses the characteristics and advantages of long-narrow attached courtyard houses in the region. it also examines the appropriateness of this approach for housing projects in the region with particular focus on the new urban developments in Egypt.
Adaptive blind equalization technique to enhance the Constant Modulus Algorithm performance
(IEEE Computer Society, 2010) Nassar A.M.; El. Nahal W.; Electronics and Communication Dept.; Faculty of Engineering; Cairo University; Giza; Egypt; Communication Dept.; MSA University; Egypt
Recently blind equalizers have a wide range of research interest since they do not require training sequence and extra bandwidth, but the main weaknesses of these approaches are their high computational complexity and slow adaptation, so different algorithms are presented to avoid this nature. This paper introduces a new blind equalization technique, the Exponentially Weighted Step-size Recursive Least Squares Constant Modulus Algorithm (EXP-RLS-CMA), based upon the combination between the Exponentially Weighted Step-size Recursive Least Squares (EXP-RLS) algorithm and the Constant Modulus Algorithm (CMA), by providing several assumptions to obtain faster convergence rate to an optimal delay where the Mean Squared Error (MSE) is minimum, and so this selected algorithm can be implemented in digital system to improve the receiver performance. Simulations are presented to show the excellence of this technique, and the main parameters of concern to evaluate the performance are, the rate of convergence, the mean square error (MSE), and the average error versus different signal-to-noise ratios. � 2011 IEEE.
Adaptive neuro-fuzzy system as a novel approach for predicting post-dialysis urea rebound
(2011) Azar A.T.; Department of Electrical Communication and Electronics; Systems Engineering; Modern Science and Arts University (MSA); 26 July Mehwar Road Intersection with Wahat Road; 6th of October City; Egypt
Total dialysis dose (Kt/V) is considered to be a major determinant of morbidity and mortality in haemodialysed patients. The continuous growth of the blood urea concentration over the 30-60-min period following dialysis, a phenomenon known as urea rebound, is a critical factor in determining the true dose of haemodialysis (HD). The misestimation of the equilibrated (true) postdialysis blood urea or equilibrated Kt/V results in an inadequate HD prescription, with predictably poor clinical outcomes for the patients. The estimation of the equilibrated post-dialysis blood urea (C eq) is therefore crucial in order to estimate the equilibrated (true) Kt/V. Measuring post-dialysis urea rebound (PDUR) requires a 30- or 60-min post-dialysis sampling, which is inconvenient. This paper presents a novel technique for predicting equilibrated urea concentration and PDUR in the form of a Takagi-Sugeno-Kang fuzzy inference system. The advantage of this neuro-fuzzy hybrid approach is that it does not require 30-60-min post-dialysis urea sample. Adaptive neuro-fuzzy inference system (ANFIS) was constructed to predict equilibrated urea (C eq) taken at 60 min after the end of the HD session in order to predict PDUR. The accuracy of the ANFIS was prospectively compared with other traditional methods for predicting equilibrated urea (C eq), PDUR and equilibrated dialysis dose ( eqKt/V). The results are highly promising, and a comparative analysis suggests that the proposed modelling approach outperforms other traditional urea kinetic models. � 2011 Inderscience Enterprises Ltd.
Adaptive Single Ended Protection Scheme for parallel Transmission Lines
(IEEE, 2017) Mourad, Dina; Shehab Eldin, E. H.
This paper presents a novel and adaptive non communication based protection proposal. It, also, provides a proposed transform, which is named the Akrap transform, to extract the transient components. The proposal uses the positive sequence currents and the Akrap transform to protect the double-circuit transmission line. The suggested proposal consists of two steps; while Step 1 detects internal faults, Step 2 identifies the faulted circuit. The proposal uses the three phase currents measurements at one end of the double circuit line. Thus, there is no need to any communication links. The proposal is evaluated with ATP-EMTP versatile simulations. Moreover, it has advantages like its protection to the total line length and the simple and fewer numbers of equations. It does not depend on the impedances of sources, the initial fault conditions as type of fault, inception time of fault, distance of fault, and resistance of fault and the current transformer saturation.
An adaptively focusing measurement design for compressed sensing based doa estimation
(IEEE, 2015) Ibrahim, Mohamed; Roemer, Florian; Del Galdo, Giovanni
In this paper we propose an adaptive design strategy for the measurement matrix for applying Compressed Sensing (CS) to Direction Of Arrival (DOA) estimation with antenna arrays. Instead of choosing the coefficients of the compression matrix randomly, we propose a systematic design methodology for constructing a measurement matrix that focuses the array towards a specific area of interest and thereby achieves a superior DOA estimation performance. The focusing is performed in a sequential manner, i.e., we start with a uniform measurement design from which regions of interest can be extracted that the subsequent measurements then focus on. By continuously updating these target regions, gradual movement of the sources can also be tracked over time. Numerical results demonstrate that the focused measurements possess a superior SNR leading to significantly enhanced DOA estimates.
Adopting Sustainability in Cities: Contributing to a Better Environment
(SSRN, 2017) Shawket, I; Ebaid, M
Cities are the most complex things that humans have created; as well badly designed settlements have negative effects on the environment. Urbanization is the future, but a question hangs over what kind of future the city looks for? The dream of utopian of human settlements has a noble history, were sustainable development is essential to enhance the quality of life. To the best of our knowledge, recent surveys have shown that good quality of Egyptian life has been lost in our cities, as general planning doesn't contribute to the current citizens' needs, although that the solution could be found by creating sustainable cities. Accordingly, the research has determined the main dimensions of sustainable cities (Environmental, Social, etc.), but with emphasize on Environmental dimension, and their key elements such as; land-use, food system, etc. Moreover, the research works on applying sustainability and rating it through applying assessment strategy that adopt the key elements. Therefore, the study moves from literature review to an empirical study on one of our cities ‘El-Gouna, Hurghada’ that welcome the concept of sustainability. As a step forward, the research approves the ability of cities to adapt sustainability – with sustainability rating verities –; contributing to a better environment.
Advanced Progress and Prospects for Producing High-Octane Gasoline Fuel toward Market Development: State-of-the-Art and Outlook
(American Chemical Society, 2023-11) Abdellatief, Tamer M. M; Ershov, Mikhail A; Savelenko, Vsevolod D; Kapustin, Vladimir M; Makhova, Ulyana A; Klimov, Nikita A; Chernysheva, Elena A; Aboul-Fotouh, Tarek M; Abdelkareem, Mohammad Ali; Mustafa, Ahmad; Olabi, A. G
The development of oil refining in advanced nations is mostly focused on low-carbon fuel. Similar efforts are being made to improve the fuel efficiency of internal combustion engines, which will result in lower exhaust emissions. Furthermore, by assessing the indicated trends in engine building, it is important for fuel manufacturers to understand how the requirements for gasoline quality indicators will change, primarily for its knock resistance. The aim of the current comprehensive article is to study the state-of-the-art review emphasizing recent progress and prospects for producing high-octane gasoline fuel toward market development. The market for branded gasoline and multifunctional additives, involving friction modifiers, corrosion inhibitor components, as well as detergent components is presented. Furthermore, market development trends and quality requirements for motor gasoline, involving antiknocking characteristics and gasoline oxygenated compounds as additives, are exhibited. Besides, perspective gasoline engine technologies, including different types of engines, are declared. The formulation of effective gasoline surrogates is a challenging task due to advanced combustion strategies, engine design, and variable operating conditions in spark-ignition engines. The extensive development of direct injection and turbocharging technologies is constrained by the actual compression ratio of engines. Likewise, an increase in the knock resistance of the produced gasoline would further increase the compression ratio and efficiency of new internal combustion engines. © 2023 American Chemical Society.
Aerodynamic Design Optimization of Range Extension Kit of a Subsonic Flying Body
(ASAT, 2017-04) Elsherbiny, A. M.; Bayoumy, A. M.; Elshabka, A. M.; Abdelrahman, M. M.
This paper aims to convert the aerodynamic shape of a conventional aerial subsonic flying body into a glide one by providing a range extension kit and fins. It describes the selection of configuration and airfoils depending on the tactical requirements and flight regimes. The wing and fins sizing is obtained using three different methods subjected to geometric constraints. The first method is an iterative optimization method using linear aerodynamic data. The second method is a genetic algorithm multi-objective function aims to maximize stability, controllability and lift-drag ratio within certain weights using linear aerodynamic data. The third method is a genetic algorithm optimization function integrated with MISSILE DATCOM aims to maximize lift-drag ratio. Then perform a direct uncontrolled six degree of freedom simulation for the three optimized designs and the conventional flying body. Comparing the results of ranges for these bodies reveals that the third method has the best range over the other designs including the conventional flying body.

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