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Hepatic and gastrointestinal disturbances in Egyptian patients infected with coronavirus disease 2019: A multicentre cohort study

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World Journal of Gastroenterology 2021年第40期27卷 6951-6966页

作者： Hend Ibrahim Shousha Shimaa Afify Rabab Maher Noha Asem Eman Fouad Ehab F Mostafa Mohammed A Medhat amr abdalazeem Hazem Elmorsy Miriam M Aziz Rateba S Mohammed Mohamed Ibrahem Hassan Elgarem Dalia Omran Mohamed Hassany Bassem Elsayed Ahmed Y Abdelaziz Mohamed El Kassas Endemic Medicine Faculty of MedicineCairo UniversityCairo 11562Egypt Gastroenterology Department National Hepatology&Tropical Medicine Research InstituteCairo 11563Egypt Hepatology Department Students HospitalCairo UniversityGiza 12566Egypt The Public Health Department Faculty of MedicineCairo UniversityCairo 11562Egypt Egyptian Ministry of Health and PopulationCairo 11567Egypt Department of Tropical Medicine and Gastroenterology Faculty of MedicineAssiut UniversityAssiut 15655Egypt Endemic Medicine Department Faculty of MedicineHelwan UniversityCairo 13544Egypt Internal Medicine 15 Mayo Smart HospitalMinistry of Health and PopulationCairo 13488Egypt Pediatrics Department Faculty of MedicineCairo UniversityCairo 11562Egypt Occupational and Environmental Medicine Department Faculty of MedicineCairo UniversityCairo 11562Egypt Clinical Biochemistry Department Faculty of medicineCairo UniversityCairo 11562Egypt Endemic Medicine Department Faculty of MedicineCairo UniversityCairo 11562Egypt Urology Department Cairo UniversityCairo 11562Egypt

BACKGROUND Various liver and gastrointestinal involvements occur in patients with coronavirus disease 2019(COVID-19)at variable *** studies report mild liver function disturbances correlated with COVID-19 severity,though liver failure is *** To study liver and gastrointestinal dysfunctions in Egyptian patients with COVID-19 and their relation to disease outcomes METHODS This multicentre cohort study was conducted on 547 Egyptian patients from April 15,2020 to July 29,*** polymerase chain reaction-confirmed COVID-19 cases were included from four quarantine hospitals affiliated to the Egyptian ministry of *** information,laboratory characteristics,treatments,fibrosis-4(FIB-4)index,COVID-19 severity,and outcomes were recorded and compared according to the degree of liver enzyme elevation and the presence of gastrointestinal ***-ups were conducted until discharge or *** analyses were performed to determine the independent factors affecting *** This study included 547 patients,of whom 53(9.68%)died during hospitalization and 1 was discharged upon his ***’mean age was 45.04±17.61 years,and 21.98%had severe or critical *** aminotransferase(ALT)and aspartate aminotransferase(AST)were available for 430 and 428 patients,*** total,26%and 32%of patients had elevated ALT and AST,*** liver injury with ALT or AST elevation exceeding 3-fold was recorded in 21(4.91%)and 16(3.73%)patients,*** gender,smoking,hypertension,chronic hepatitis C,and lung involvement were associated with elevated AST or *** was elevated in 50%of patients over ***-4 was significantly higher in patients admitted to the intensive care unit(ICU),those with more severe COVID-19,and *** independent variables affecting outcome were supplementary vitamin C intake(1 g daily capsules)[odds ratio(OR):0.05,95%confidence interval(CI

关键词： COVID-19 Egypt Liver injury Gastrointestinal symptoms Fibrosis-4 Liver enzymes

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Daily and annual performance analyses of the BIPV/T system in typical cities of Sudan

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Energy and Built Environment 2023年第5期4卷 516-529页

作者： Yousif Abdalgadir Hua Qian Dongliang Zhao abdalazeem Adam Wenqing Liang School of Energy and Environment Southeast UniversityNanjing 210096China Department of Mechanical Engineering College of EngineeringKarary UniversityOmdurman 12304Sudan Energy Conservation Research Group(ECRG) College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjingJiangsu 210016China

In this paper,a numerical study is carried out to investigate the performance of a coupled BIPV/T-AHU system in Sudan.A mathematical model was utilzed,Matab Simulink was used to do simul *** showed good agreement with experimental data from the *** problem studied in this paper is reducing the energy required for heating in winter(preheating BIPV/T)and avoiding the high photovoltaic cell temperature in *** compare the energy consumption with and without BIPV/T-AHU in different cities in *** results showed that utilizing the exhaust air to cool the photovoltaic cell could reduce the PV/T cell temperature in the range(9-12)℃,which can increase the eletrical power output in a range of(12-21.44)W/m^(2).In winter,utilization of the preheating BIPV/T system can decrease the heating load in Wadi Halfa in the range of(6-107.1%).Damazein does not need a high heating power in the daytime for the ait conditioning system depending on the local climate,so the heat energy produced by the system can be used for drying,desiccant cooling,or heating water,with increasing the eletrice power produced by cooling PV/T *** results indicated a great posibility to use the BIPV 1 T system under the studied conditions,in addition,this study provides important information for the application of the BIPV/T system in these areas.

关键词： Air-based PV/T B1PV/T AHU Numerical simulation Energy saving

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Reconstruction of earthquake hazard in regions of sparse seismic monitoring

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Earthquake Engineering and Engineering Vibration 2007年第2期6卷 99-109页

作者： amr S. Elnashai Mid-America Earthquake Center Department of Civil and Environmental Engineering University of Illinois Champaign at Urbana-Urbana IL USA

Studying strong motion records and the spatial distribution of ground shaking is of great importance in understanding the underlying causes of damage in earthquakes. Many regions in the world are either not instrumented or are sparsely instrumented. As such, significant opportunities for motion-damage correlations are lost. Two recent and damaging earthquakes belong to the class of lost opportunities, namely the Kashmir （Pakistan） earthquake of October 2005 and the Yogyakarta （Indonesia） earthquake of May 2006. In this paper, an overview of the importance of supply and demand studies in earthquake-stricken regions is given, followed by two examples of investigative engineering seismology aimed at reconstructing the hazard from sparse data. The paper closes with a plea for responsible authorities to invest in seismic monitoring networks in the very near future.

关键词： Kashmir earthquake Yogyakarta (Indonesia) earthquake field investigation hazard reconstruction sparse seismic monitoring back-analysis attenuation relationships

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Herbal extracts counteract cisplatin-mediated cell death in rat testis

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Asian Journal of Andrology 2008年第2期10卷 291-297页

作者： amr Amin Alaaeldin A. Hamza amr Kambal Sayel Daoud Biology Department United Arab Emirates University AI-Ain 17551 United Arab Emirates Hematology Laboratory Twain Hospital At-Ain 15258 United Arab Emirates Histopathology Laboratory Twain Hospital At-Ain 15258 United Arab Emirates

Aim： To evaluate the protective effects of ginger （Gin） and roselle （Ros） against testicular damage and oxidative stress in a cisplatin （CIS）-induced rodent model. Their protective effects against CIS-induced apoptosis in testicular and epididymal sperms is also investigated. Methods： Ethanol extracts of Gin or Ros （1 g/***） were given orally to male albino rats for 26 days. This period began 21 days before a single CIS intraperitoneal injection （10 mg/kg body weight）. Results： Gin or Ros given orally significantly restored reproductive function. Both tested extracts notably reduced the CIS-induced reproductive toxicity, as evidenced by restoring the testis normal morphology. In Gin and Ros, the attenuation of CIS-induced damage was associated with less apoptotic cell death both in the testicular tissue and in the sperms. CIS-induced alterations of testicular lipid peroxidation were markedly improved by these plant extracts. Conclusion： The present results provide further insights into the mechanisms of protection against CIS-induced reproductive toxicity and confirm the essential anti-oxidant potential of both examined extracts. （Asian J Androl 2008 Mar; 10： 291-297）

关键词： cisplatin cell death toxicity flow cytometry ginger roselle

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A Reliable and Scalable Internet of Military Things Architecture

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Computers, Materials & Continua 2021年第6期67卷 3887-3906页

作者： Omar Said amr Tolba Department of Information Technology College of Computers and Information TechnologyTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Department of Computer Science Community CollegeKing Saud UniversityRiyadh11437Saudi Arabia Department of Mathematics and Computer Science Faculty of ScienceMenoufia UniversityShebin Elkoum32511Egypt

Recently,Internet of Things(IoT)technology has provided logistics services to many disciplines such as agriculture,industry,and ***,it has become one of the most important scientific research *** IoT to military domain has many challenges such as fault tolerance and *** this paper,IoT technology is applied on the military field to create an Internet of Military Things(IoMT)***,the architecture of the aforementioned IoMT system is *** architecture consists of four main layers:Communication,information,application,and decision *** layers provided a fault tolerant coverage communication system for IoMT ***,it implemented data reduction methods such as filtering,compression,abstraction,and data prioritization queuing system to guarantee QoS for the transmitted ***,it used decision support technology and IoMT application unification ***,to evaluate the IoMT system,an intensive simulation environment is constructed using the network simulation package,*** simulation results proved that the proposed IoMT system outperformed the traditional military system with regard to the performance metrics,packet loss,end-to-end delay,throughput,energy consumption ratio,and data reduction rate.

关键词： Internet of things internet of military things simulation military battlefield

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State of the Art in Alcohol Sensing with 2D Materials

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Nano-Micro Letters 2020年第3期12卷 22-54页

作者： Ramin Boroujerdi amr Abdelkader Richard Paul Faculty of Science and Technology Bournemouth UniversityTalbot CampusFern BarrowPoole BH125BBUK Department of Engineering University of CambridgeCambridge CB30FSUK

Since the discovery of graphene,the star among new materials,there has been a surge of attention focused on the monatomic and monomolecular sheets which can be obtained by exfoliation of layered *** materials are known as two-dimensional(2D)materials and offer enormous versatility and *** ultimate single atom,or molecule,thickness of the 2D materials sheets provides the highest surface to weight ratio of all the nanomaterials,which opens the door to the design of more sensitive and reliable chemical *** variety of properties and the possibility of tuning the chemical and surface properties of the 2D materials increase their potential as selective sensors,targeting chemical species that were previously difficult to *** planar structure and the mechanical flexibility of the sheets allow new sensor designs and put 2D materials at the forefront of all the candidates for wearable *** developing sensors for alcohol,the response time is an essential factor for many industrial and forensic applications,particularly when it comes to hand-held ***,we review recent developments in the applications of 2D materials in sensing alcohols along with a study on parameters that affect the sensing *** review also discusses the strategies used to develop the sensor along with their mechanisms of sensing and provides a critique of the current limitations of 2D materials-based alcohol sensors and an outlook for the future research required to overcome the challenges.

关键词： Sensors and biosensors Alcohol probes Electrochemical detectors Ethanol metabolites 2D materials

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SmartSurf^(ACE)transepithelial photorefractive keratectomy with mitomycin C enhancement after small incision lenticule extraction

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Eye and Vision 2021年第1期8卷 276-285页

作者： amr A.Gab‑Alla Faculty of Medicine Ophthalmology DepartmentSuez Canal UniversityRing RoadIsmailiaEgypt

Background:To evaluate predictability,stability,efficacy,and safety of transepithelial photorefractive keratectomy(TPRK)using smart pulse technology(SPT)(SmartSurface procedure)of Schwind Amaris with mitomycin C for correction of post small incision lenticule extraction(SMILE)myopic residual refractive ***:This study is a prospective,non-comparative case series conducted at a private eye centre in Ismailia,Egypt,on eyes with post-SMILE myopic residual refractive errors because of undercorrection or suction loss(suction loss occurred after the posterior lenticular cut and the creation of side-cuts;redocking was attempted,and the treatment was completed in the same session with the same parameters)with myopia or myopic *** patients were followed up post-SMILE for six months before the SmartSurface procedure,and then they were followed up for one year after *** were performed using Amaris excimer laser at 500 *** main outcomes included refractive predictability,stability,efficacy,safety and any reported ***:This study included 68 eyes of 40 patients out of 1920 total eyes(3.5%)with post-SMILE technique myopic residual refractive *** average duration between the SMILE surgery and TPRK was 6.7±0.4 months(range 6 to 8 months).The mean refractive spherical equivalent(SE)was within±0.50 D of plano correction in 100%of the eyes at 12 months *** of<0.50 D was achieved in 100%of the *** mean of the residual SE error showed statistically significant improvement from preoperative−1.42±0.52 D to 0.23±0.10 D(P<0.0001).Uncorrected distance visual acuity(UDVA)(measured by Snellen’s chart and averaged in logMAR units)was improved significantly to 0.1±0.07(P<0.0001).UDVA was 0.2 logMAR or better in 100%of the eyes,0.1 logMAR or better in 91.2%of the eyes,and 0.0 logMAR in 20.6%of the *** distance visual acuity(CDVA)remained unchanged in 79.4%of eyes.14.7%of eyes gained one line of CDVA(Snellen).

关键词： Transepithelial PRK Mitomycin C Refractive enhancement Small incision lenticule extraction Smart pulse technology SmartSurface procedure

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A numerical investigation into the effect of altering compression ratio, injection timing, and injection duration on the performance of a diesel engine fuelled with diesel-biodiesel-butanol blend

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Clean Energy 2024年第5期8卷 73-96页

作者： Abdulkarim Youssef amr Ibrahim Mechanical Engineering Department Beirut Arab University115020 BeirutLebanon Mechanical Engineering Department Alexandria UniversityAlex 21544Egypt

Using renewable fuels for diesel engines can reduce both air pollution and dependence on fossil fuels.A computer simulation was constructed to predict the performance,combustion characteristics,and NOx emissions of a diesel engine fuelled with diesel-biodiesel-butanol *** simulation was validated by comparing the modelling results against experimental data and a good agreement between the results was *** fuels used for the validation were diesel(B0),biodiesel(B100),diesel-biodiesel blend(B50),and two diesel-biodiesel-butanol blends with 45%diesel-45%biodiesel-10%butanol(Bu10)and 40%diesel-40%biodiesel-20%butanol(Bu20)by *** results showed that the addition of butanol reduced NOx emissions but deteriorated the engine *** aim of the current work was the numerical optimization of the different parameters to enhance the engine performance while using butanol to decrease NOx *** engine compression ratio(CR)varied from 14 to 24,in increments of *** injection timing(IT)was reduced from 30°before top dead centre(bTDC)to 5°bTDC in increments of 5°.Also,the fuel injection duration(IDur)was extended from 20°to 50°in increments of 10°.Results showed that the increase in the CR improved engine performance for the two investigated fuels,Bu10 and *** maximum engine brake power(BP),thermal efficiency(BTE),and minimum brake-specific fuel consumption(BSFC)of 1.46 kW,32.3%,and 0.273 kg/kWh respectively,were obtained when the Bu10 fuel was injected under the optimum conditions of 24 CR,15°bTDC IT,and 40°*** these optimum conditions,the BP,BTE,and BSFC improved by 3%-3.5%for Bu10 and Bu20 fuel blends compared with the base engine conditions of a CR of 22,30°IDur,and 10°bTDC *** heat release rate during the premixed phase increased when the IT was advanced,while the mixing-controlled combustion phase was enhanced when the IT was *** emissions increased with increasing CR,while both an increase in IDur at con

关键词： compression ratio injection timing injection duration butanol biodiesel diesel

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Evaluation of Grid-Connected Photovoltaic Plants Based on Clustering Methods

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Computer Systems Science & Engineering 2023年第6期45卷 2837-2852页

作者： amr A.Munshi Computer Engineering Department Umm Al-Qura UniversitySaudi Arabia

Photovoltaic(PV)systems are electric power systems designed to sup-ply usable solar power by means of photovoltaics,which is the conversion of light into electricity using semiconducting *** systems have gained much attention and are a very attractive energy resource *** substantial advantage of PV systems is the usage of the most abundant and free energy from the *** systems play an important role in reducing feeder losses,improving voltage profiles and providing ancillary services to local ***,large PV grid-connected systems may have a destructive impact on the stability of the elec-tric *** is due to thefluctuations of the output AC power generated from the PV systems according to the variations in the solar energy ***,the elec-trical distribution system with high penetration of PV systems is subject to perfor-mance degradation and *** that,this project attempts to enhance the integration process of PV systems into electrical grids by analyzing the impact of installing grid-connected PV *** accomplish this,an indicative representa-tion of solar irradiation datasets is used for planning and powerflow studies of the electric network prior to PV systems *** datasets contain lengthy historical observations of solar energy data,that requires extensive analysis and *** overcome that the lengthy historical datasets are reduced and clus-tered while preserving the original data *** resultant clusters can be utilized in the planning stage and simulation ***,studies related to PV systems integration into the electric grid are conducted in an efficient manner,avoiding computing resources and processing times with easier and practical implementation.

关键词： Clustering electric grid electric network photovoltaic

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FILTERING CHARACTERISTICS AND EXPERIMENTAL INVESTIGATION OF ONE-DIMENSIONAL PERIODIC RODS

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Chinese Journal of Mechanical Engineering 2008年第2期21卷 53-57页

作者： ZHENG Ling LI Yinong BAZ amr State Key Laboratory of Mechanical Transmission Chongqing University Chongqing 400044 China Department of Mechanical Engineering University of Maryland College Park MD20742 USA

Passive periodic structures exhibit unique dynamic characteristics that make the passive periodic structures act as mechanical filters for wave propagation. As a result, wave can propagate along the periodic structures only within specific frequency bands called the pass bands and wave propagation is completely blocked within other frequency bands called the “stop bands”. A theoretical method based on the transfer matrix formulation is developed in order to effectively investigate the influence of periodicity, variable geometry and material properties on the wave propagation characteristics of one-dimensional periodic rod. Several numerical examples are presented in order to illustrate their unique tunable filtering and localization characteristics. The experiments are conducted to verify the numerical predictions and to demonstrate the capability of the wavelet transform as a very powerful tool to uniquely identify and compare the energy distribution both in the time and frequency domain. The flexibility that the spectral width and location of the pass and stop bands can be tuned by introducing intentional variation in geometric and material properties for the individual substructure or cell is identified completely by both numerical predictions and experimental results. The results demonstrate the potential of such one-dimensional periodic structure in controlling the dynamics of wave propagation as a mechanical filter such as engine mount, gearbox support strut and other applications.

关键词： Periodic structure Rod Wave propagation Stop bands Wavelet

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