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Search Results: 1 - 10 of 724 matches for " Amr Radi "
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Implementation of High Performance Electronic Circuits for Zero Suppression and Encoding of Digital Signals  [PDF]
Ashraf H. Yahia, Amr Radi, Salwa M. Youssef
Journal of Signal and Information Processing (JSIP) , 2015, DOI: 10.4236/jsip.2015.63022
Abstract: This paper presents a design of a data processing circuit for receiving digital signals from front end-electronic board chips of a specific nuclear detector, encoding and triggering them via specific optical links operating at a specific frequency. Such processed signals are then fed to a data acquisition system (DAQ) for analysis. Very high-speed integrated circuit hardware description language (VHDL) algorithms and codes were created to implement this design using field programmable gate array (FPGA) devices. The obtained data were simulated using international standard simulators.
Modeling and Simulation for High Energy Sub-Nuclear Interactions Using Evolutionary Computation Technique  [PDF]
Mahmoud Y. El-Bakry, El-Sayed A. El-Dahshan, Amr Radi, Mohamed Tantawy, Moaaz A. Moussa
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.41009
Abstract: High energy sub-nuclear interactions are a good tool to dive deeply in the core of the particles to recognize their structures and the forces governed. The current article focuses on using one of the evolutionary computation techniques, the so-called genetic programming (GP), to model the hadron nucleus (h-A) interactions through discovering functions. In this article, GP is used to simulate the rapidity distribution \"\"?of total charged, positive and negative pions for p--Ar and p--Xe interactions at 200 GeV/c and charged particles for p-pb collision at 5.02 TeV. We have done so many runs to select the best runs of the GP program and finally obtained the rapidity distribution \"\"?as a function of the lab momentum \"\", mass number (A) and the number of particles per unit solid angle (Y). In all cases studied, we compared our seven discovered functions produced by GP technique with the corresponding experimental data and the excellent matching was so clear.
Fairness Aware Group Proportional Frequency Domain Resource Allocation in L-SC-FDMA Based Uplink  [PDF]
Irfan Ahmed, Amr Mohamed
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.48060
Abstract: This paper presents virtual clusters based proportional fairness and resource allocation scheme for Localized Single Carrier Frequency Division Multiple Access (L-SC-FDMA). L-SC-FDMA has been selected as the uplink transmission scheme in 3GPP Long Term Evolution (LTE) due to its low Peak to Average Power Ratio (PAPR) over OFDMA in general and high rate-sum capacity over Interleaved SC-FDMA in particular. Virtual cluster-based proportional fairness (VCPF) scheduler exploits the link adaptation information available at MAC layer to form virtual clusters. The distributed proportional fairness scheduler ensures a minimum throughput for all users in the coverage area by assigning contiguous RBs, proportional to the throughput and the number of users in a particular cluster or group. Simulations have been performed using practical scenario of uniformly distributed users in Rayleigh faded coverage area and design formulas have been devised for network planning to get the best possible fairness with promising level of quality of service (QoS).
Simulation of small size divertor tokamak plasma edge at low density of plasma  [PDF]
Amr Hasheim Bekheit
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.41010
Abstract: A low density plasma edge of small size divertor tokamak has been modeling by “B2SOLPS0.5.2 D” fluid transport code. The results of modeling are: 1) Formation of the strong “ITB” has detected more reliable with discovery that, low density plasma is necessary and important condition for it to form. 2) Reduction of plasma density play significantly role in the formation of the strong ITB as global parameter, possibly through change in the steep density gradient which stabilize “ITG” mode. 3) The radial electric field of small size divertor tokamak plasma edge is plasma density dependence and maximum radial electric field shear is found at low plasma density. 4) In the “NBI” discharge the toroidal (parallel) velocity at low plasma density is co-current and upward direction. 5) The structure of plasma pressure and radial electric field in quiescent H-mode are obtained.
Impact of drifts in edge plasma of small size divertor tokamak  [PDF]
Amr H. Bekheit
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.42019
Abstract: The effect of poloidal E × B and diamagnetic drifts in edge plasma of Small Size Divertor (SSD) Tokamak is studied with two-dimensional B2SO- LPS-0.5.2D fluid transport code. The simulation results show the following: 1) For normal toroidal magnetic field, the increasing of core plasma density leads to large divertor asymmetries due to poloidal E × B and diamagnetic drifts. 2) Switching on the E × B and diamagnetic drifts leads to large change in poloidal distribution of radial electric field and induced counter-clockwise circulation (flow) around the x-point. 3) Switching on the E × B and diamagnetic drifts leads to the structure of poloidal distribution of radial electric field is nonmonotonic which responsible for negative spikes. 4) Switching on the E × B and diamagnetic drifts in vicinity of separatrix leads to the structure of poloidal distribution of radial electric field that has viscous layer. 5) Switching on the E × B and diamagnetic drifts results in torque generation. This torque spins up the toroidal rotation. 6) The E × B drift velocity depends on the plasma temperature heating and doesn't depend on plasma density.
Simulation of Radial Variation of Neutral Atoms on Edge Plasma of Small Size Divertor Tokamak  [PDF]
Amr Hasheim Bekheit
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.32019
Abstract: Simulations have been performed to investigate the impact of radial variation of neutral atoms (neutral puff) on the edge plasma of small size divertor tokamak. It was demonstrated that, the variation of neutral atoms (neutral puff) in edge plasma of small size divertor tokamak generates additional large radial electric field and large radial electric field shear near separatrix which can significantly influence global confinement by affecting the transition from low (L) to high (H) confinement. This simulation was performed by using B2SOLPS0.5.2D fluid transport code based on a reduced form of the transport form of transport equations. These transport equations are implemented in B2SOLPS0.5.2D fluid transport code and solved for the parameters of Small Size Divertor tokamak. The results of simulation by fluid transport B2SOLPS0.5.2D code can be summarized as follow: 1) The Plasma Parameters are significantly effect by neutral atoms puffing in the edge plasma of small size divertor tokamak; 2) Contrary to previous expectation [1] of the predominant role of neutral viscosity on toroidal flux, anomalous transport was found to be mainly effect on toroidal flux; 3) Puffing of gas (neutral) in the edge plasma of small size divertor tokamak produce strong ITB; 4) Puffing of gas (neutral) in the edge plasma of small size divertor increase plasma density especially in SOL through charge exchange and ionization processes; 5) Puffing of gas (neutral) in the edge plasma of small size divertor has significant effect on the distribution of plasma heat flux; 6) The radial electric field is affected by gas (neutral) puffing in the edge plasma of small size divertor; 7) Puffing of neutral (atoms) in the edge plasma of small size divertor tokamak produce large radial electric field shear which contribute to L-H transition; 8) The centrifugal effect has no influence on distribution of the radial profile of parallel (toroidal) velocity of edge plasma of small size divertor tokamak during gas (neutral) puffing; 9) The bootstrap current in edge plasma of small size divertor tokamak is significantly affected by gas (neutral) puffing.
Preliminary Evaluation of New Quinoa Genotypes under Sandy Soil Conditions in Egypt  [PDF]
Amr S. Shams
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.911100
Abstract: Field trial was carried out at Ismailia Research Station, Ismailia Governorate, Egypt to evaluate some quinoa genotypes under arid environment of sandy soil for identifying its agronomic potentiality, chemical composition and economic opportunity. Nine quinoa genotypes including six Peruvian varieties (Amarilla Marangani, Amarilla Sacaca, Blanca de Junin, Kancolla, Salcedo INIA and Rosada de Huancayo) and three new accessions (QS14, QS16 and QS17-2) were compared in randomized complete block design with three replications. The results revealed that quinoa proved success in sandy soil with suitable grain yield under Egyptian conditions. QS17-2 accession stays only from 115 to 120 days in the field according to environmental factors and treated as short duration accession, while growth duration of the four varieties; Blanca de Junin, Kancolla, Salcedo INIA and Rosada de Huancayo, as well as, accessions of QS14 and QS16 were moderate. Amarilla Marangani and Amarilla Sacaca varieties had the longest duration genotypes. Amarilla Sacaca and Amarilla Marangani varieties, as well as, QS17-2 accession gave the highest grain yield compared with the other genotypes. The highest protein content in quinoa grains was 13.60%, which recorded from QS17-2 accession, while the lowest value (10.75%) was recorded by Blanca de Junin variety. Moreover, Salcedo INIA variety had the lowest saponins content in quinoa grains (0.07%) while QS16 accession recorded the highest content (0.22%). The economic evaluation gave a clear indicator of the lower farm prices of quinoa grains in Egypt (US$ 1000/ton), which gives a comparative advantage to Egypt in the MENA region for quinoa exportation.
Discrete Simulation of the Remote Access to the Resources of a Virtual Research Laboratory
Radi Romansky
International Journal of Information Technology and Computer Science , 2012,
Abstract: This article discusses the problem of an evaluation of the remote access to the resources of a Virtual Research Lab (VRL) and information servicing investigation by using queuing model and program simulation. The results presented here are the final part of general investigation of proposed architecture of the VRL developed in the frame of two years scientific project. Some results from the initial phases of the investigation (functional, deterministic and stochastic modeling) are discussed in other publications of the author. The purpose of this article is to present a simulation organization and performance factors evaluation of the remote access and information servicing in the VRL. In this connection formalization and an abstract model are made. An extension of this formalization based on the queuing theory is made and a general queuing model for the simulation organization is developed. The program realization of the simulation experiments is made by using the system WebGPSS. Object of investigation is the user access to the resources and some variants are evaluated, for example ‘single-user access to a single resource’ and ‘multiple-user access to multiple resources’. Some experimental results are discussed. Different assessments for the components that take part in the remote access are calculated and presented (utilization, workload, waiting time, etc.)
De erli Karde im ve Meslekta m Prof. Muammer Onat
Radi Birol
tasar?m + kuram , 2011,
Metafora i (giper) kstensija
Radi? Jovanka
Ju?noslovenski Filolog , 2008, DOI: 10.2298/jfi0864347r
Abstract: (ruski) Termin ' kstensija' imeet gorazdo bolee opredelennoe zna enie po sravneniju s terminom metafora: kstensija podrazumevaet sposobnost' vyra enija (oby no leksi eski zavisimogo slova) k ras ireniju i vyra eniju svojstv predmetov, kotorye nastol'ko razli ny po svoej prirode, to isklju ena vsjakaja vozmo nost' podobija ljubogo iz ih svojstv (ide ovek, ~ paun, ~ lav, ~ ekser, ~ voda; meka maca, ~ igra ka, ~ bunda, meke papu e meko krzno, meka kru ka, ~ voda, i t. p). kstensija, v ukazannom zna enii svjazana s giper kstensiej, a tak e s metaforoj ne po analogii, t. e. s pervymi tremja 'vidami' metafory, vydelennymi v 'Po tike' Aristotelja ('perenesenie naimenovanija s odnogo predmeta na drugoj, pri em ili s roda na vid, ili s vida na rod, ili s vida na vid'). Razli ie me du (1) po ti eskoj metaforoj ('ukra enie', 'stilisti eskaja figura'), zame aemoj potomu, to ona osnovyvaetsja na sbli enii dvuh ponjatij po analogii i tem samym 'soob aet novoe znanie' ili ' ivo predstavljaet ve '', i (2) metaforoj ne po analogii t. e. perenosom naimenovanija, kotoryj neograni enno i nezametno ras irjaetsja, t. k. on ne osnovan na ustanovlenii svjazej po analogii me du predmetami (ponjatijnaja metafora - aspekt, kotoryj do nedavnego vremeni vklju alsja v termin polisemija), - mo no dostato no to no obozna it' pri pomo i terminov intensivnaja i kstensivnaja metafora, sostavljaju ih oppoziciju. Takim obrazom, mo no govorit' ob kstensivnoj metafore, kotoraja razvivaetsja v irinu i nezametna, i ob intensivnoj metafore, kotoraja zame aetsja, t. k. razvivaetsja ne v irinu, a v glubinu.
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