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News: Doctor says CS gas can damage brain, County councillor cleared in ballot paper trial, Indian criticism of relief puzzles UN men, Bernard Levin Chacun ...
1971 - Gale Group | TDA
Ruipengyu Li, Weeratunge Malalasekera, Salah Ibrahim, Bo Liu,
Accidental gas explosions are a significant concern in process industries. In an explosion event, the promotion of flame acceleration due to turbulence generated from obstacles is responsible for many severe damages. This paper discusses the numerical evaluation and the mechanism of pressure rise in vented explosions in the presence of obstructions using computational fluid dynamics (CFD). The large eddy simulation (LES) technique is employed with a dynamic flame surface density (DFSD) in the combustion ...
Tópico(s): Combustion and flame dynamics
2018 - Elsevier BV | Process Safety and Environmental Protection
Robert De Caix, Un Saharien, G. François, André Meyreuil, Camille Martin, Paul Bourdarie, Capitaine Pein, Lieutenant G. Besset, Capilaine Julien, E. Déchaud,
... Paris-Lyon-Méditerranée Voyages Circulaires. Editorial: D'in Salah a Tikhammar Par Amguid Une Tournée De Police ...
1904 - Gale Group | NCCO EuropeAfrica
Ruipengyu Li, Weeratunge Malalasekera, Salah Ibrahim,
There is a growing need to understand and estimate the explosion hazards associated with hydrogen storage and utilisation. This paper presents a comprehensive numerical study on the explosion characteristics of a lean hydrogen-air mixture in a small-scale obstructed vented chamber. The large eddy simulation (LES) technique is employed to study the highly unsteady turbulence-driven explosion when the flame propagates past successive obstructions. A dynamic flame surface density (DFSD) model is applied ...
Tópico(s): Combustion and flame dynamics
2018 - Elsevier BV | International Journal of Hydrogen Energy
Mohamed Salah Ibrahim, Venkatesh Ramireddy, Anastasia Lavrenko, Jonas König, Florian Römer, Markus Landmann, Marcus Grossmann, Giovanni Del Galdo, Reiner S. Thomä,
In this paper we investigate the design of compressive antenna arrays for narrow-band direction of arrival (DOA) estimation that aim to provide a larger aperture with a reduced hardware complexity and allowing reconfigurability, by a linear combination of the antenna outputs to a lower number of receiver channels. We present a basic receiver architecture of such a compressive array and introduce a generic system model that includes different options for the hardware implementation. We then discuss ...
Tópico(s): Advanced MIMO Systems Optimization
2017 - Elsevier BV | Signal Processing
Michael Fairweather, G. K. Hargrave, Salah Ibrahim, David J. Walker,
An experimental and theoretical study of premixed flame propagation in a number of small-scale, cylindrical vessels is described. The study provides further understanding of flame propagation and the generation of overpressure in explosions, and allows the assessment of a mathematical model of explosions through comparisons with the experimental data obtained. Laser sheet images and data gathered on flame location, shape, and overpressures generated during the course of explosions in an empty vessel ...
Tópico(s): Structural Response to Dynamic Loads
1999 - Elsevier BV | Combustion and Flame
Salah Ibrahim, Mohamed Mourad, Aziza I. Hussein, Kamel H. Rahouma,
Mobile communication technologies are tremendously grown in the last few years. With the advent of the fifth generation of wireless networks, and with millions of base stations and billions of connected devices, the need for spectral and energy-efficient system design will be more convincing. In this paper, the evolution of mobile communication networks starting from first-generation to the fifth generation with comparative studies are first introduced. Then, summarizing the recent research initiatives ...
Tópico(s): Millimeter-Wave Propagation and Modeling
2021 - Elsevier BV | Procedia Computer Science
Mohamed Salah Ibrahim, Nicholas D. Sidiropoulos,
Providing reliable service to users close to the edge between cells remains a challenge in cellular systems, even as 5G deployment is around the corner. These users are subject to significant signal attenuation, which also degrades their uplink channel estimates. Even joint detection using base station (BS) cooperation often fails to reliably detect such users, due to near-far power imbalance, and channel estimation errors. Is it possible to bypass the channel estimation stage and design a detector ...
Tópico(s): Wireless Communication Networks Research
2020 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Wireless Communications
Mohamed Salah Ibrahim, Aritra Konar, Nicholas D. Sidiropoulos,
Massive MIMO is currently a leading physical layer technology candidate that can dramatically enhance throughput in 5G systems, for both unicast and multicast transmission modalities. As antenna elements are becoming smaller and cheaper in the mmW range compared to radio frequency (RF) chains, it is crucial to perform antenna selection at the transmitter, such that the available RF chains are switched to an appropriate subset of antennas. This paper considers the joint problem of multicast beamforming ...
Tópico(s): Antenna Design and Optimization
2020 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Signal Processing
Samar Reda Al-Sayed, Abdel Hamid Ahmed Hussein, Adel Nofal, Salah Ibrahim Hassab Elnaby, Haytham Elgazzar,
A wear resistant coating was successfully made on an annealed Ti-6Al-4V titanium alloy by laser surface cladding using 60 wt.% WC + wt.% 40 NiCrBSi powder blends. Coaxial laser cladding was performed by means of Yb:YAG disk laser with a 3-KW continuous wave. Different laser interaction times were attempted to get the optimal conditions for promising mechanical properties. The new contribution was to accomplish larger clad layer thickness with applying the shortest possible laser interaction time that ...
Tópico(s): Intermetallics and Advanced Alloy Properties
2019 - EDP Sciences | Metallurgical Research & Technology
Hasan F. Khazaal, Haider TH. Salim ALRikabi, Faisal Theyab Abed, Salah Ibrahim Kadhm,
One of the problems of the south area in Iraq is the reduced of quantity and the lack of quality of the supplied water, especially in the remote areas. This problem is caused due to many reasons. One of these reasons is the decrease of supplied electricity, which reflected on the performance of water pumping and desalination stations. This paper presenting a project that presented to municipality of Al-Nasiriya city to overcome the problem of the lack in quantity and quality of the supplied water ...
Tópico(s): Membrane Separation Technologies
2019 - International University of Sarajevo | Periodicals of Engineering and Natural Sciences (PEN)
Ahmed Hamdi Abu haraz, Khoubieb Ali Abd elrahman, Mojahid Salah Ibrahim, Waleed Hassan Hussien, Mohammed Siddig Mohammed, Marwan Mustafa Badawi, Mohamed Ahmed Salih,
Sudan Ebola virus is single stranded negative sense RNA genome belonging to Filovirus Filoviridae family that causes hemorrhagic fever. There is no treatment or vaccine for it, thus the aim of this study is to design a peptide vaccine using immuoinformatics approaches to analyse the glycoprotein of the all strain of SUDV, to determine the conserved region which is further studied to predict all possible epitopes that can be used as a peptide vaccine. A total of 21 Sudan Ebola virus glycoprotein ...
Tópico(s): Vaccine Coverage and Hesitancy
2017 - OMICS Publishing Group | Advanced Techniques in Biology & Medicine
Ryo Takahashi, Toru Segawa, Salah Ibrahim, Tatsushi Nakahara, Hiroshi Ishikawa, Atsushi Hiramatsu, Yue‐Cai Huang, Ken‐ichi Kitayama,
A torus-topology photonic data center network with smart flow control is presented, where optical packet switching (OPS), optical circuit switching (OCS), and virtual OCS (VOCS) schemes are all enabled on a unified hardware platform via the combination of hybrid optoelectronic routers (HOPR) and a centralized network controller. An upgraded HOPR is being developed with the goal of handling 100 Gbps optical packets with a high energy efficiency of 90 mW/Gbps and low latency of less than 100 ns. The architecture ...
Tópico(s): Advanced Optical Network Technologies
2015 - | Journal of Optical Communications and Networking
Ken‐ichi Kitayama, Yue‐Cai Huang, Yuki Yoshida, Ryo Takahashi, Toru Segawa, Salah Ibrahim, Tatsushi Nakahara, Y. Suzaki, Masahiro Hayashitani, Yohei Hasegawa, Mizukoshi Yasuhiro, Atsushi Hiramatsu,
We review our work on an intra-data center (DC) network based on co-deployment of optical packet switching (OPS) and optical circuit switching (OCS), conducted within the framework of a five-year-long national R&D program in Japan (∼March 2016). For the starter, preceding works relevant to optical switching technologies in intra-DC networks are briefly reviewed. Next, we present the architecture of our torus-topology OPS and agile OCS intra-DC network, together with a new flow management concept, where ...
Tópico(s): Interconnection Networks and Systems
2015 - Institute of Electrical and Electronics Engineers | Journal of Lightwave Technology
Toru Segawa, Salah Ibrahim, Tatsushi Nakahara, Yusuke Muranaka, Ryo Takahashi,
We demonstrate error-free 100-Gb/s optical packet switching with low power consumption by using a combination of a label processor and 8 × 8 broadcast-and-select (B&S) optical switch. To achieve energy-efficient label processing, an optical-trigger-pulse generator that consumes energy only for a very short duration is realized, whereas the optoelectronic serial-to-parallel converter used to interface the fast label bits to a slow CMOS processor has been improved to operate with a reduced trigger pulse ...
Tópico(s): Advanced Optical Network Technologies
2015 - Institute of Electrical and Electronics Engineers | Journal of Lightwave Technology
Ahmed Hasanin, Akram Eladawy, Hossam Mohamed, Yasmin Salah Ibrahim, Ahmed Lotfy, Hanan Mostafa, Doaa Ghaith, Ahmed Mukhtar,
The prevalence of extensively drug resistant gram negative bacilli (XDR-GNB) is rapidly progressing; however in Egypt data are sparse. We conducted the present study to quantify the incidence, risk factors and outcome of patients harboring XDR-GNB.A one year prospective study was done by collecting all the bacteriological reports for cultures sent from the surgical intensive care unit, Cairo university teaching hospital. XDR-GNB were defined as any gram negative bacilli resistant to three or more ...
Tópico(s): Antibiotic Use and Resistance
2014 - African Field Epidemiology Network | Pan African Medical Journal
Binbin Guan, Stevan S. Djordjevic, Nicolas K. Fontaine, Linjie Zhou, Salah Ibrahim, Ryan P. Scott, David J. Geisler, Zhi Ding, S. J. Ben Yoo,
This paper presents an overview of a complementary metal-oxide-semiconductor-compatible, programmable, analog optical lattice filter based on silicon unit cells arrayed in large-scale photonic integrated circuits. The unit cell employs a combination of a ring resonator and a Mach-Zehnder interferometer with tunable phase elements in both of the paths. Each proposed unit cell contributes a separately controllable pole and zero pair. Under various configurations, we experimentally achieved >60-dB two- ...
Tópico(s): Optical Network Technologies
2014 - IEEE Photonics Society | IEEE Journal of Selected Topics in Quantum Electronics
Salah Ibrahim, Nicolas K. Fontaine, Stevan S. Djordjevic, Binbin Guan, Tiehui Su, Stanley Cheung, Ryan P. Scott, Andrew Pomerene, Liberty L. Seaford, Craig Hill, Steve Danziger, Zhi Ding, Katsunari Okamoto, S. J. Ben Yoo,
We demonstrate a fully-reconfigurable fourth-order optical lattice filter built by cascading identical unit cells consisting of a Mach-Zehnder interferometer (MZI) and a ring resonator. The filter is fabricated using a commercial silicon complementary metal oxide semiconductor (CMOS) process and reconfigured by current injection into p-i-n diodes with a reconfiguration time of less than 10 ns. The experimental results show full control over the single unit cell pole and zero, switching the unit cell ...
Tópico(s): Advanced Fiber Laser Technologies
2011 - Optica Publishing Group | Optics Express
Shaza B. Idris, Kristina Arvidson, Peter Plikk, Salah Ibrahim, Anna Finne‐Wistrand, Ann‐Christine Albertsson, Anne Isine Bolstad, Kamal Mustafa,
In tissue engineering, the resorbable aliphatic polyester poly(L-lactide) (PLLA) is used as scaffolds in bone regeneration. Copolymers of poly(L-lactide)-co-(epsilon-caprolactone) [poly(LLA-co-CL)] and poly(L-lactide)-co-(1,5-dioxepan-2-one) [poly(LLA-co-DXO)], with superior mechanical properties to PLLA, have been developed to be used as scaffolds, but the influence on the osteogenic potential is unclear. This in vitro study of test scaffolds of poly(LLA-co-CL) and poly(LLA-co-DXO) using PLLA scaffolds ...
Tópico(s): Bone Metabolism and Diseases
2010 - Wiley | Journal of Biomedical Materials Research Part A
Lian-Wee Luo, Salah Ibrahim, Arthur Nitkowski, Zhi Ding, Carl B. Poitras, S. J. Ben Yoo, Michal Lipson,
We demonstrate a 120 GHz 3-dB bandwidth on-chip silicon photonic interleaver with a flat passband over a broad spectral range of 70 nm. The structure of the interleaver is based on an asymmetric Mach-Zehnder interferometer (MZI) with 3 ring resonators coupled to the arms of the MZI. The transmission spectra of this device depict a rapid roll-off on the band edges, where the 20-dB bandwidth is measured to be 142 GHz. This device is optimized for operation in the C-band with a channel crosstalk as ...
Tópico(s): Optical Network Technologies
2010 - Optica Publishing Group | Optics Express
Stevan S. Djordjevic, Lian Wee Luo, Salah Ibrahim, Nicolas K. Fontaine, Carl B. Poitras, Binbin Guan, Linjie Zhou, Katsunari Okamoto, Zhi Ding, Michal Lipson, S. J. Ben Yoo,
We present a fully reconfigurable optical filter built by cascading four identical unit cells. The devices are fabricated using two distinct methods: a complementary metal-oxide-semiconductor (CMOS) compatible process utilizes deep ultraviolet (DUV) lithography with tuning elements defined by ion implantation to make lateral p-i-n diodes for current injection regions, while an electron beam (E-beam) lithography process uses nickel chrome (NiCr) heaters as tuning elements. The fabricated devices are ...
Tópico(s): Optical Network Technologies
2010 - Institute of Electrical and Electronics Engineers | IEEE Photonics Technology Letters
Ross D. Hall, Assaad R. Masri, Pavel Yaroshchyk, Salah Ibrahim,
This paper studies the effects of the number and location of solid obstacles on the rate of propagation of turbulent premixed flames. A vented explosion chamber is constructed where controlled premixed flames are ignited from rest to propagate past grids or baffles plates as well as other solid obstacles strategically positioned in the chamber. Laser Induced Fluorescence (LIF) is used to image OH which is used as an indicator of the reaction zone while pressure transducers are used to obtain pressure– ...
Tópico(s): Computational Fluid Dynamics and Aerodynamics
2008 - Elsevier BV | Combustion and Flame
Koert Ritmeijer, Clive R. Davies, Ruth Van Zorge, Shr‐Jie Wang, Judy Schorscher, Salah Ibrahim Dongu'du, Robert N. Davidson,
Summary During an epidemic of visceral leishmaniasis (VL) in eastern Sudan, Médecins Sans Frontières distributed 357 000 insecticide‐treated bednets (ITN) to 155 affected villages between May 1999 and March 2001. To estimate the protective effect of the ITN, we evaluated coverage and use of ITN, and analysed VL incidence by village from March 1996 to June 2002. We provided ITN to 94% of the individuals >5 years old. Two years later, 44% (95% CI 39–48%) of nets were reasonably intact. Because ITN were ...
Tópico(s): Trypanosoma species research and implications
2007 - Wiley | Tropical Medicine & International Health
Salah Ibrahim, Inge Jonassen, Endre N. Vasstrand, A.N. Amaratunga, Saman Warnakulasuriya, Ove Bruland, Bjarte Dysvik, Mai Lill Suhr,
Oral squamous cell carcinoma (OSCC) is one of the major health problems in Sri Lanka and the disease is associated with the habit of Betel Quid (BQ) chewing. Using 35k oligo microarrays, we analyzed the gene expression profile of 15 Sri Lankan patients diagnosed with OSCCs and pair-wised normal controls and correlated the findings with the clinicopathological data. Following the recording of the scanned array images and data analysis, results for selected candidate genes were verified using QRT-PCR. ...
Tópico(s): Oral and Maxillofacial Pathology
2007 - Elsevier BV | Oncology Reports
Ali A. Shash, Salah Ibrahim Habash,
The construction industry is prone to conflicts and disputes due to complexity, competitive environment, and complicated project documents. In this complex environment, members from various professions, each has their goals and desires to secure the most of his own benefits, work together to build a structure. The objectives of this study were to investigate the frequency, causes, and remedies of disputes in the Central Province of Saudi Arabia. The required data were collected, through a questionnaire ...
Tópico(s): Occupational Health and Safety Research
2020 - Association of Engineering, Project, and Production Management | Journal of Engineering Project and Production Management
Wafik Said Bahnasy, Yasser Abo Elfotoh El-Heneedy, Ehab Ahmed Shawky El-Seidy, Nema Ata Allah Labib, Ibrahim Salah Eldeen Ibrahim,
Disordered sleep breathing is a common complication of diabetic peripheral neuropathy (DPN) manifested by excessive daytime sleepiness, morning headache, morning dizziness, cognitive decline, and mood changes.This study was performed on 30 non-obese type 2 diabetic patients; 20 with clinically evident DPN and 10 without. Ten age-, sex-, and body mass index-matched healthy control subjects were also included. Patients and control were subjected to history taking, neurological examination, glycated ...
Tópico(s): Parkinson's Disease Mechanisms and Treatments
2018 - Springer Science+Business Media | The Egyptian Journal of Neurology Psychiatry and Neurosurgery
Salah Ibrahim, Mohamed Mourad, Kamel H. Rahouma, Aziza I. Hussein,
Abstract Given that, the exponential pace of growth in wireless traffic has continued for more than a century, wireless communication is one of the most influential innovations in recent years. Massive Multiple-Input Multiple-Output (M-MIMO) is a promising technology for meeting the world's exponential growth in mobile data traffic, particularly in 5G networks. The most critical metrics in the massive MIMO scheme are Spectral Efficiency (SE) and Energy Efficiency (EE). For single-cell M-MIMO uplink ...
Tópico(s): Advanced Wireless Network Optimization
2022 - Springer Science+Business Media | Optical and Quantum Electronics
Amnah A. A. Alasgah, Eman Salah Ibrahim Rizk,
This research aims at studying the empowerment of Saudi women in the tourism sector according to the Kingdom's 2030 vision, as well as discussing the constituents and constraints of their empowerment in the tourism sector. The researchers reached a number of important results; such as the fact that the representation of Saudi women in the tourism sector is still significantly low compared to men. Recently, however, the level of empowering the Saudi women in the tourism sector has been increased ...
Tópico(s): Economic and Industrial Development
2021 - Taylor & Francis | Journal of Sustainable Finance & Investment
Manal Mohamed Makhlouf, Sahar Gamil Elwakil, Nihal Salah Ibrahim,
Human parvovirus B-19 (PB-19) is a cause of hemolysis, red blood cell aplasia, and severe conditions in patients with sickle cell anemia, but the molecular mechanisms of the infection are still insufficiently understood. This study aimed to detect PB-19 DNA together with its antibodies in the sera of Egyptian children with sickle cell disease and to assess the contribution of this infection, which causes transient cessation of erythropoiesis, in precipitating severe anemia in some cases. One hundred ...
Tópico(s): Dermatological and COVID-19 studies
2015 - Elsevier BV | Journal of Microbiology Immunology and Infection
Ali A. Shash, Salah Ibrahim Habash,
Abstract A construction contract is a mechanism to bind a project owner and a contractor in a legal agreement to construct a project against a designated monitory consideration. However, projects are usually assembled over a long period with high uncertainty and complexity. Under such a dynamic business transaction, current static contracts fail to arrange for an appropriate and stable transaction. This paper reveals, through a questionnaire survey that was sent to all grade1 and 2 contractors and ...
Tópico(s): Public-Private Partnership Projects
2020 - Association of Engineering, Project, and Production Management | Journal of Engineering Project and Production Management