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Problems of drinking water treatment along Ismailia Canal Province, Egypt

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第3期9卷 232-242页

作者： mohamed h.geriesh Klaus-Dieter BALKE Ahmed E.EL-RAYES Geology Department Faculty of ScienceSuez Canal UniversityP.C.41522IsmailiaEgypt Institute of Geosciences Teubingen University72076 TeubingenGermany

The present drinking water purification system in Egypt uses surface water as a raw water supply without a preliminary filtration *** the other hand,chlorine gas is added as a disinfectant agent in two steps,pre-and *** to these reasons most of water treatment plants suffer low filtering effectiveness and produce the trihalomethane(ThM) species as a chlorination *** Ismailia Canal represents the most distal downstream of the main Nile *** its water contains all the proceeded pollutants discharged into the *** addition,the downstream reaches of the canal act as an agricultural drain during the closing period of the high Dam gates in January and February every ***,the wide industrial zone along the upstream course of the canal enriches the canal water with high concentrations of heavy *** obtained results indicate that the canal gains up to 24.06×106 m3 of water from the surrounding shallow aquifer during the closing period of the high Dam gates,while during the rest of the year,the canal acts as an influent stream losing about 99.6×106 m3 of its water *** reduction of total organic carbon(TOC) and suspended particulate matters(SPMs) should be one of the central goals of any treatment plan to avoid the disinfectants *** combination of sedimentation basins,gravel pre-filtration and slow sand filtration,and underground passage with microbiological oxidation-reduction and adsorption criteria showed good removal of parasites and bacteria and complete elimination of TOC,SPM and heavy ***,it reduces the use of disinfectants chemicals and lowers the treatment ***,this purification system under the arid climate prevailing in Egypt should be tested and modified prior to application.

关键词： Drinking water treatment hazardous by-products Natural attenuation Ismailia Canal Egypt

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Characterization of aerodynamic performance of wind-lens turbine using high-fidelity CFD simulations

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Frontiers in Energy 2022年第4期16卷 661-682页

作者： Islam hAShEM Aida A.hAFIZ mohamed h.mohamed Mechanical Power Engineering Department Faculty of Engineering-MatariaHelwan UniversityCairo 11718Egypt State Key Laboratory of hydroscience and Engineering Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Mechanical Engineering Department College of Engineering and Islamic ArchitectureUmm Al-Qura UniversityMakkah5555Saudi Arabia

Wind-lens turbines(WLTs)exhibit the prospect of a higher output power and more suitability for urban areas in comparison to bare wind *** wind-lens typically comprises a diffuser shroud coupled with a flange appended to the exit periphery of the ***-lenses can boost the velocity of the incoming wind through the turbine rotor owing to the creation of a lowpressure zone downstream the flanged *** this paper,the aerodynamic performance of the wind-lens is computationally assessed using high-fidelity transient CFD simulations for shrouds with different profiles,aiming to assess the effect of change of some design parameters such as length,area ratio and flange height of the diffuser shroud on the power *** power coefficient(Cp)is calculated by solving the URANS equations with the aid of the SST k–ω***,comparisons with experimental data for validation are accomplished to prove that the proposed methodology could be able to precisely predict the aerodynamic behavior of the windlens *** results affirm that wind-lens with cycloidal profile yield an augmentation of about 58%increase in power coefficient compared to bare wind turbine of the same rotor *** is also emphasized that diffusers(cycloid type)of small length could achieve a twice increase in power coefficient while maintaining large flange heights.

关键词： shroud diffuser-augmented wind turbine(DAWT) Betz limit aerodynamics computational fluid dynamics(CFD)

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Efficient Computation Offloading of IoT-Based Workflows Using Discrete Teaching Learning-Based Optimization

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Computers, Materials & Continua 2022年第11期73卷 3685-3703页

作者： mohamed K.hussein mohamed h.Mousa Department of Computer Science Faculty of Computers and InformaticsSuez Canal UniversityIsmailiaEgypt Department of Information Technology College of Computer Science at AlKamilUniversity of JeddahJeddahSaudi Arabia

As the Internet of Things(IoT)and mobile devices have rapidly proliferated,their computationally intensive applications have developed into complex,concurrent IoT-based workflows involving multiple interdependent *** exploiting its low latency and high bandwidth,mobile edge computing(MEC)has emerged to achieve the high-performance computation offloading of these applications to satisfy the quality-of-service requirements of workflows and *** this study,we propose an offloading strategy for IoT-based workflows in a high-performance MEC *** proposed task-based offloading strategy consists of an optimization problem that includes task dependency,communication costs,workflow constraints,device energy consumption,and the heterogeneous characteristics of the edge *** addition,the optimal placement of workflow tasks is optimized using a discrete teaching learning-based optimization(DTLBO)*** experimental evaluations demonstrate that the proposed offloading strategy is effective at minimizing the energy consumption of mobile devices and reducing the execution times of workflows compared to offloading strategies using different metaheuristics,including particle swarm optimization and ant colony optimization.

关键词： high-performance computing internet of things(IoT) mobile edge computing(MEC) workflows computation offloading teaching learning-based optimization

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Synthesis and characterization of CNT/Ce-TiO_2 nanocomposite for phenol degradation

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Journal of Rare Earths 2012年第7期30卷 651-658页

作者： Shaari N Tan S h mohamed A R School of Chemical Engineering Engineering Campus University Sains Malaysia

An innovative photocatalyst, Carbon nanotube （CNT） supported Ce-TiO2 nanocomposite was successfully synthesized via modi-fied sol gel method and investigated in a batch reactor for abolition of phenol under UV light spectrum. Characterization of catalyst micro-structure and internal properties were done by means of X-ray diffraction （XRD）, Brunauer-Emmett-Teller （BET）, scanning electron micros-copy （SEM）, transmission electron microscopy （TEM） and UV-vis diffuse reflectance spectra （DRS）. Ce doping can inhibit phase transfor-mation from anatase to rutile and eliminate the recombination of electron-hole pairs in the catalyst. The presence of CNT in TiO2 composite can both increase the photoactivity under UV and change surface properties to achieve sensitivity to visible light. The optimum mass ratio of CNT support and cerium （Ce） dopant in TiO2 was the prominent factor to harvest CNT/Ce-TiO2 photocatalyst nanocomposite. The results demonstrated that optimum mass ratio of CNT：TiO2：Ce was 0.02：1.0：0.06, which resulted in the great performance of the photocatalyst to de-grade about 94% of phenol in a 50 mg/L solution in only 3 h. In this paper, dissimilar role of CNT support and Ce dopant in the TiO2 photo-catalysis of phenol was also discussed.

关键词： carbon nanotube (CNT) cerium TiO2 nanocomposite photocatalyst phenol rare earths

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Obstructive sleep apnea syndrome and fatty liver: Association or causal link?

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World Journal of Gastroenterology 2010年第34期16卷 4243-4252页

作者： mohamed h Ahmed Christopher D Byrne Chemical Pathology Department Southampton University Hospital NHS Trust Southampton SO16 6YD United Kingdom Endocrinology and Metabolism DOHaD Division University of Southampton and Southampton University Hospitals Trust Southampton SO16 6YD United Kingdom

Obstructive sleep apnea (OSA) is a complex disorder that consists of upper airway obstruction, chronic intermittent hypoxia and sleep fragmentation. OSA is well known to be associated with hypoxia, insulin resistance and glucose intolerance, and these factors can occur in the presence or absence of obesity and metabolic syndrome. Although it is well established that insulin resistance, glucose intolerance and obesity occur frequently with non-alcoholic fatty liver disease (NAFLD), it is now becoming apparent that hypoxia might also be important in the development of NAFLD, and it is recognized that there is increased risk of NAFLD with OSA. This review discusses the association between OSA, NAFLD and cardiovascular disease, and describes the potential role of hypoxia in the development of NAFLD with OSA.

关键词： Sleep apnea syndrome hyperlipidemia Non-alcoholic fatty liver disease Insulin resistance

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Beta secretase activity in peripheral nerve regeneration

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Neural Regeneration Research 2017年第10期12卷 1565-1574页

作者： Carolyn Tallon mohamed h.Farah Department of Neurology at Johns hopkins School of Medicine BaltimoreMDUSA

While the peripheral nervous system has the capacity to regenerate following a nerve injury,it is often at a slow rate and results in unsatisfactory recovery,leaving patients with reduced *** regeneration associated genes have been identified over the years,which may shed some insight into how we can manipulate this intrinsic regenerative ability to enhance repair following peripheral nerve *** lab has identified the membrane bound protease beta-site amyloid precursor protein-cleaving enzyme 1（BACE1）,or beta secretase,as a potential negative regulator of peripheral nerve *** beta secretase activity levels are abolished via a null mutation in mice,peripheral regeneration is enhanced following a sciatic nerve crush ***,when activity levels are greatly increased by overexpressing beta secretase in mice,nerve regeneration and functional recovery are impaired after a sciatic nerve crush *** addition to our work,many substrates of beta secretase have been found to be involved in regulating neurite outgrowth and some have even been identified as regeneration associated *** this review,we set out to discuss BACE1 and its substrates with respect to axonal regeneration and speculate on the possibility of utilizing BACE1 inhibitors to enhance regeneration following acute nerve injury and potential uses in peripheral neuropathies.

关键词： peripheral nerve axonal regeneration beta-site amyloid precursor protein-cleaving enzyme 1

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Nonalcoholic fatty liver disease and COVID-19:An epidemic that begets pandemic

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World Journal of Clinical Cases 2021年第17期9卷 4133-4142页

作者： Musaab Ahmed mohamed h Ahmed College of Medicine Ajman UniversityAjman 346United Arab Emirates Department of Medicine and hIV Metabolic Clinic Milton Keynes University Hospital NHS Foundation TrustMilton Keynes MK56LDUnited Kingdom

Coronavirus disease 2019(COVID-19)caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has become a global pandemic,affecting all the individuals across the ***-19 has gained significant attention due to its high prevalence among individuals with diabetes,nonalcoholic fatty liver disease(NAFLD),and metabolic *** is the hepatic manifestation of metabolic syndrome and can be associated with a high risk of developing type 2 *** association of COVID-19 and NAFLD has also gained more attention because NAFLD is highly associated with the epidemic of *** is a potential risk factor for SARS-CoV-2 infection and severe COVID-19,independent of metabolic ***,it is not yet clear whether the epidemics of obesity and NAFLD have perpetuated the current pandemic of *** research is urgently needed to assess the following:(1)Whether NAFLD is a high risk factor for SARS-CoV-2 infection;(2)Whether NAFLD is associated with the severe form of COVID-19;and(3)Whether the presence of NAFLD can explain the racial variation in the morbidity and mortality associated with *** review summarizes the interactions between COVID-19 and NAFLD,mechanism of liver injury by COVID-19,and effect of lockdown due to COVID-19 on patients with NAFLD.

关键词： Fatty liver COVID-19 Diabetes Obesity Pandemic

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Axonal regeneration and sprouting as a potential therapeutic target for nervous system disorders

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Neural Regeneration Research 2021年第10期16卷 1901-1910页

作者： Katherine L.Marshall mohamed h.Farah Department of Neurology at Johns hopkins School of Medicine BaltimoreMDUSA

Nervous system disorders are prevalent health issues that will only continue to increase in frequency as the population ***-back axonopathy is a hallmark of many neurologic diseases and leads to axonal disconnection from their targets,which in turn leads to functional *** the course of many of neurologic diseases,axons can regenerate or sprout in an attempt to reconnect with the target and restore synapse *** amyotrophic lateral sclerosis(ALS),distal motor axons retract from neuromuscular junctions early in the disease-course before significant motor neuron *** is evidence of compensatory motor axon sprouting and reinnervation of neuromuscular junctions in ALS that is usually quickly overtaken by the disease *** drugs that enhance compensatory sprouting and encourage reinnervation may slow symptom progression and retain muscle function for a longer period of time in ALS and in other diseases that exhibit dying-back *** remain many outstanding questions as to the impact of distinct disease-causing mutations on axonal outgrowth and regeneration,especially in regards to motor neurons derived from patient induced pluripotent stem *** microfluidic chambers are powerful tools for studying the distal axons of human induced pluripotent stem cells-derived motor neurons,and have recently been used to demonstrate striking regeneration defects in human motor neurons harboring ALS disease-causing *** the human neuromuscular circuit with human induced pluripotent stem cells-derived motor neurons will be critical for developing drugs that enhance axonal regeneration,sprouting,and reinnervation of neuromuscular *** this review we will discuss compensatory axonal sprouting as a potential therapeutic target for ALS,and the use of compartmentalized microfluidic devices to find drugs that enhance regeneration and axonal sprouting of motor axons.

关键词： amyotrophic lateral sclerosis axonal regeneration dying-back axonopathy in vitro neuromuscular junction iPSC-derived motor neurons microfluidic device motor axon sprouting

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ThE EFFECT OF OCCUPANCY ON ELECTRICITY USE IN ThREE CANADIAN SChOOLS

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Journal of Green Building 2018年第1期13卷 95-112页

作者： mohamed Ouf mohamed h.Issa Phil Merkel Panos Polyzois Department of Civil Engineering University of Manitoba15 Gillson StreetWinnipeg MB R3T 5V6 Canada Customer Engineering Department Manitoba Hydro

Through building performance simulations, previous studies showed the effect of occupants on buildings’ energy consumption. To further demonstrate this effect using empirical evidence, this study analyzed the effect of occupancy on real-time electricity consumption in three case-study schools in Manitoba. Within each school, one classroom as well as the gymnasium were sub-metered to collect real-time electricity consumption data at half-hourly intervals. The study focused on electricity consumption for lighting and plug loads, which make up 30% of energy consumption in Canadian commercial and institutional buildings. A comprehensive method was developed to investigate energy-related occupant behaviour in the sub-metered spaces using four different tools simultaneously: 1) gymnasium bookings after school hours over a four-month period, 2) half-hourly observations of lighting and equipment use in the sub-metered spaces in each school over a two-week period, 3) a daily survey administered to teachers in the sub-metered classrooms over a two-week period, and 4) occupancy and light sensors to evaluate actual recorded occupancy and light use durations over a four-month period. Results showed that recorded occupancy durations over a 4-month period only explained less than 10% of the variations in classrooms’ lighting electricity consumption, meaning that lights may have been used frequently while classrooms were unoccupied. Results also showed the differences in gymnasiums’ electricity consumption were still statistically significant between the three schools, even after school hours and when the gymnasiums were not used or booked for other activities. This study is the first to provide in-depth evaluation of the effect of occupancy on electricity consumption in Canadian schools.

关键词： Occupancy energy efficiency school buildings real-time electricity monitoring

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Large-amplitude dust acoustic solitons in an opposite polarity dusty plasma with generalized polarization force

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Chinese Physics B 2022年第1期31卷 199-207页

作者： Mahmood A.h.Khaled mohamed A.Shukri Yusra A.A.hager Department of Physics Faculty of Education(Al-Mahweet)Sana'a UniversitySana'aYemen Department of Physics Faculty of ScienceSana'a UniversitySana'aYemen Department of Physics Faculty of EducationSana'a UniversitySana'aYemen

Linear and nonlinear dust acoustic(DA)waves have been investigated in an opposite polarity dusty plasma comprising negatively and positively charged dust grains,Maxwellian electrons and ions,including the generalized polarization force *** properties of linear DA waves have been significantly altered by the dual dust polarity and polarization *** amplitude DA solitons have been discussed in the framework of the Sagdeev potential *** results show that both rarefactive and compressive solitons can exist in such a dusty *** basic features of the Sagdeev potential have been examined under the effect of the polarization force parameter R,the ratio of the charge number of the positive dust to that of the negative dust Z,and the Mach number *** results show that these parameters play a significant role in determining the region of existence of large amplitude DA solitons.

关键词： large amplitude opposite polarity dusty plasma polarization force

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