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NANOPOROUS MATERIALS BASED ON SPIROKETAL AND SPIROTHIOKETAL POLYMERS FOR SEPARATING METHANOL-TOLUENE MIXTURE

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Chinese Journal of Polymer Science 2011年第4期29卷 450-455页

作者： Hamada Hamada abdel-Razik Zeinhom Mohamed El-Bahy Chemistry Department Faculty of Science and Education(Alkhurma Branch)Taif UniversitySaudi Arabia

Organic microporous materials based on spiroketal and spirothioketal polymers were synthesized through 1,3- dioxol-forming polymerization reaction between pentaerythritol or pentaerythritol tetrathiol and different types of cyclohexa- 1,4-dione derivatives. The structure of the prepared polymers was confirmed by NMR spectroscopy and molecular mass measurements. Nitrogen adsorption/desorption isotherms of the prepared polymers show a large amount of nitrogen adsorbed at low relative pressure indicating microporosity. These polymers have Brunauer Emmitt and Teller （BET） surface areas in the range from 492 （m^2g^-1） to 685 （m^2 g^-1）. The prepared polymers were found to be useful for pervaporation separation of methanol-toluene mixture with a separation factor up to 12.5 and fluxes, varying between 6.7×10-3 kg/（m^2 h） and 13.4 × 10^-3 kg/（m^2 h）.

关键词： Spiroketal polymers Nanoporous materials Separation membranes.

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Characteristics and outcome of newborn admitted with acute bilirubin encephalopathy to a tertiary neonatal intensive care unit

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World Journal of Pediatrics 2019年第1期15卷 42-48页

作者： Nahed Fahmy Helal Eman abdel Ghany abdel Ghany Walaa Alsharany Abuelhamd Amna Yehea Ahmed Alradem Department of Pediatrics Faculty of MedicineCairo UniversityCairoEgypt Ministry of Health CairoEgypt

Background Acute bilirubin encephalopathy (ABE) still represents a significant cause of morbidity and mortality throughout the world,especially in developing *** aimed to determine the prevalence of ABE based on the Johnson bilirubininduced neurologic dysfunction (BIND) score and to describe the discharge *** We prospectively studied all newborns ≥ 35 weeks with ABE by evaluating signs of mental sensorium,muscle tone,and cry patterns over 1 *** 12% (81 out of 674) of the newborns admitted for neonatal hyperbilirubinemia had a BIND score > *** admission age was 6 ± 4.1 days;total serum bilirubin (TSB) was 31.2± 10 mg/dL (range 17.5-75.2).Of these newborns,40.7% and 21% had evidence of haemolysis and sepsis,*** mortality was 9.9%;58% of the newborns showed signs of mild-to-moderate BIND at discharge,while 32.1% survived with an apparently normal *** BIND score was significantly correlated with admission TSB (r=0.476,P < 0.001).Similarly,BIND score at discharge was correlated with admission TSB (r=0.442,P < 0.001) and admission BIND score (r =0.888,P < 0.001).The regression model showed that admission TSB (P < 0.001) and maternal illiteracy (P =0.034) were predictors of the BIND score at admission,while admission BIND score was the best indicator of the discharge score (P < 0.001).Conclusions ABE is still a major problem in our *** TSB and maternal illiteracy are good predictors of bilirubin encephalopathy at admission and discharge.

关键词： Bilirubin-induced neurologic dysfunction Bilirubin encephalopathy Kernicterus Neonatal hyperbilirubinemia

Lightweight Transfer Learning Models for Ultrasound-Guided Classification of COVID-19 Patients

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Computers, Materials & Continua 2021年第11期69卷 2295-2312页

作者： Mohamed Esmail Karar Omar Reyad Mohammed Abd-Elnaby abdel-Haleem abdel-Aty Marwa Ahmed Shouman College of Computing and Information Technology Shaqra UniversityShaqra11961Saudi Arabia Department of Industrial Electronics and Control Engineering Faculty of Electronic Engineering(FEE)Menoufia UniversityMenouf32952Egypt Department of Mathematics and Computer Science Faculty of ScienceSohag UniversitySohag82524Egypt Department of Computer Engineering College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Department of Physics College of SciencesUniversity of BishaBisha61922Saudi Arabia Department of Physics Faculty of ScienceAl-Azhar UniversityAssiut71524Egypt Department of Computer Science and Engineering Faculty of Electronic Engineering(FEE)Menoufia UniversityMenouf32952Egypt

Lightweight deep convolutional neural networks(CNNs)present a good solution to achieve fast and accurate image-guided diagnostic procedures of COVID-19 ***,advantages of portable Ultrasound(US)imaging such as simplicity and safe procedures have attracted many radiologists for scanning suspected COVID-19 *** this paper,a new framework of lightweight deep learning classifiers,namely COVID-LWNet is proposed to identify COVID-19 and pneumonia abnormalities in US *** to traditional deep learning models,lightweight CNNs showed significant performance of real-time vision applications by using mobile devices with limited hardware *** main lightweight deep learning models,namely MobileNets,ShuffleNets,MENet and MnasNet have been proposed to identify the health status of lungs using US *** image dataset(POCUS)was used to validate our proposed COVID-LWNet framework *** classes of infectious COVID-19,bacterial pneumonia,and the healthy lung were investigated in this *** results showed that the performance of our proposed MnasNet classifier achieved the best accuracy score and shortest training time of 99.0%and 647.0 s,*** paper demonstrates the feasibility of using our proposed COVID-LWNet framework as a new mobilebased radiological tool for clinical diagnosis of COVID-19 and other lung diseases.

关键词： Coronavirus medical image processing artificial intelligence ultrasound

Preparation of quantum size of tin oxide: Structural and physical characterization

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Progress in Natural Science:Materials International 2016年第2期26卷 145-151页

作者： N.M.Shaalan D.Hamad A.Y.abdel-Latief M.A.abdel-Rahim Physics Department Faculty of Science Assiut University

SnO2NPs were successfully prepared via a hydrothermal method. X-ray diffraction analysis con fi rmed the rutile tetragonal structure of SnO2NPs. The crystallite size increased from 1.18 to 5.06 nm with increasing the preparation temperature from 100 to 180 °C. The SEM photography of the products exhibited the agglomeration of the SnO2nanocrystals to large view particles, while TEM images con fi rmed the polycrystalline phase and crystallite size those analyzed from XRD. The UV–vis absorption of ethanol suspended SnO2NPs was measured. The optical band-gap energies（Eg） were signi fi cantly blue-shifted due to quantum con fi nement. Fluorescence spectra came to con fi rm this shift, where a clear shift in the maximum emission peak was observed. Stokes shift of SnO2nanocrystals was found to be crystallite size dependent.

关键词： Nanostructures Tin dioxide Luminescence Optical properties

Appraisal of Improvement in Physiological and Metabolic Processes by Exogenously Applied Natural and Synthetic Ascorbic Acid in Okra(Abelmoschus esculentus L.)Fruit Subjected to Water Deficit Stress

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国际实验植物学杂志(英文) 2023年第10期92卷 2761-2784页

作者： Muhammad Younis Nudrat Aisha Akram Arafat abdel Hamed abdel Latef Muhammad Ashraf Department of Botany Government College UniversityFaisalabad38000Pakistan Department of Botany and Microbiology Faculty of ScienceSouth Valley UniversityQena83523Egypt Department of Botany University of LahoreLahorePakistan

To counteract the effects of drought stress,scientists have adopted several approaches including the use of different chemicals both inorganic and organic,which is contemplated as a highly efficient and cost-effective shot-gun *** acid(AsA)is a potential organic substance,which widely occurs in plants,and is considered to be an effective antioxidant to counteract reactive oxygen species(ROS).Thus,a pot experiment was performed to assess the relative mitigating impacts of synthetic AsA and naturally occurring AsA in the form of lemon juice(LJ)and orange juice(OJ)on two cultivars of okra(Abelmoschus esculentus L.)namely Sabz Pari and Bhindi Sanwali under varying water deficit *** 30 days of seed germination,okra seedlings were subjected to different irrigation regimes,i.e.,water deficit stress[(65%and 50%F.C.)and control conditions(100%F.C.)].Different levels of AsA[control(no spray),14 mg L^(−1)LJ,24 mg L^(−1)OJ and 150 mg L^(−1)AsA]obtained from different sources were applied as a foliar spray to control and water-stressed *** stress prominently reduced plant growth and yield attributes of the okra ***-deficit conditions(65%and 50%F.C.)substantially decreased the fruit chlorophyll(a,b)pigments and the activity of superoxide dismutase(SOD)enzyme,while an increase was observed in the contents of fruit’s hydrogen peroxide(H_(2)O_(2)),malondialdehyde(MDA),total phenolics,total soluble sugars,AsA,and total soluble *** stress also increased the activities of antioxidant enzymes like peroxidase(POD)and catalase(CAT).However,plant growth and yield attributes,fruit chlorophyll pigments,total phenolics,total soluble sugars,total free amino acids,total soluble proteins,AsA,GB,H_(2)O_(2),and the activities of antioxidant enzymes(POD and CAT)were increased by the AsA exogenous treatment in both okra cultivars under water deficit and control ***,LJ and OJ were more effective than the synthetic AsA in up

关键词： Okra ascorbic acid lemon juice orange juice drought tolerance

Physiotherapy Management of Rheumatic Diseases

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Open Journal of Rheumatology and Autoimmune Diseases 2024年第1期14卷 37-47页

作者： Aly Badra Kamissoko Abdoulaye Barry Mamadou Lamine Diallo Boutros Cosme Nato abdel Amide Gbadamassi Marie Traore Abèni Faouzyath Yaya Facely Traore Paul Eloundou Sory Diane Matènè Komara Halimatou Barry Moriba Toure Moriba Toure Kaba Conde Owonayo Oniankitan Department of Rheumatology Ignace Deen University Hospital Conakry Guinea Department of Rheumatology Sylvanus Olympio University Hospital Lome Togo Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon

Introduction: Physiotherapy is an integral part of the non-drug treatment strategy for rheumatological conditions. The evidence for its effects is not formal. The objective was to evaluate the impact of physiotherapy in the management of rheumatological disorders. Methods: 6-month case-control study (December 15, 2021 to June 20, 2022) at Ignace Deen University Hospital (Conakry). Patients with rheumatological disease who received drug therapy and physiotherapy were included in the case group. Age- and sex-matched controls had rheumatological conditions, treated without physiotherapy. The evaluation questionnaires were used: WOMAC (osteoarthritis), EIFEL (low back pain), NDI (neck pain), SPADI (shoulder). Patients with heart failure, respiratory failure and/or skin infection were not included. Results: We collected 773 patients (389 cases and 384 controls) with a mean age of 53.8 years ± 12.2 with female predominance (56.8%). Patients were mainly followed for osteoarthritis (65.2%). Rheumatological conditions managed were knee-based (119;30.6%), lumbar spine (220;56.6%), shoulders (27;6.9%) and cervical spine (23;5.9%). For an average duration of 53.4 ± 12.2 minutes per session, patients had benefited from a median of 19 physiotherapy sessions. After 3 months, the baseline mean VAS of 6/10 improved to 2.2 ± 1.6 for cases and 5.7 ± 1.2 for controls. Functional capacity was improved (WOMAC: 41.8 ± 22.7 vs. 18.3 ± 7.3). The satisfaction of patients treated with physiotherapy was 20 times higher than in controls. Conclusion: Physiotherapy performed in the management of rheumatological conditions significantly reduced pain and improved functional capacity.

关键词： Rheumatological Disease Physiotherapy WOMAC Guinea

Intelligent IoT-Aided Early Sound Detection of Red Palm Weevils

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Computers, Materials & Continua 2021年第12期69卷 4095-4111页

作者： Mohamed Esmail Karar Omar Reyad abdel-Haleem abdel-Aty Saud Owyed Mohd F.Hassan College of Computing and Information Technology Shaqra UniversityShaqra11961Saudi Arabia Department of Industrial Electronics and Control Engineering Faculty of Electronic EngineeringMenoufia UniversityEgypt Faculty of Science Sohag UniversitySohag82524Egypt Department of Physics College of SciencesUniversity of BishaBisha61922Saudi Arabia Department of Mathematics College of SciencesUniversity of BishaBisha61922Saudi Arabia Department of Computer and Information Science CeRDaSUniversiti Teknologi PetronasMalaysia

Smart precision agriculture utilizes modern information and wireless communication technologies to achieve challenging agricultural ***,Internet of Things(IoT)technology can be applied to monitor and detect harmful insect pests such as red palm weevils(RPWs)in the farms of date palm *** this paper,we propose a new IoT-based framework for early sound detection of RPWs using fine-tuned transfer learning classifier,namely *** sound sensors,namely TreeVibes devices are carefully mounted on each palm trunk to setup wireless sensor networks in the *** trees are labeled based on the sensor node number to identify the infested ***,the acquired audio signals are sent to a cloud server for further on-line analysis by our fine-tuned deep transfer learning model,i.e.,*** proposed infestation classifier has been successfully validated on the public TreeVibes *** includes total short recordings of 1754 samples,such that the clean and infested signals are 1754 and 731 samples,*** to other deep learning models in the literature,our proposed InceptionResNet-V2 classifier achieved the best performance on the public database of TreeVibes audio *** resulted classification accuracy score was 97.18%.Using 10-fold cross validation,the fine-tuned InceptionResNet-V2 achieved the best average accuracy score and standard deviation of 94.53%and±1.69,*** the proposed intelligent IoT-aided detection system of RPWs in date palm farms is the main prospect of this research work.

关键词： Red palm weevils smart precision agriculture internet of things artificial intelligence

Adaptive Gain Tuning Rule for Nonlinear Sliding-mode Speed Control of Encoderless Three-phase Permanent Magnet Assisted Synchronous Motor

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中国电工技术学会电机与系统学报(英文) 2023年第3期7卷 301-310页

作者： Ghada A.abdel Aziz Rehan Ali Khan IEEE Power Electronics and Energy Conversion Department Electronics Research InstituteCairo 11843Egypt Department of Electrical Engineering University of Science&TechnologyBannuPakistan.

In this paper, an adaptive gain tuning rule is designed for the nonlinear sliding mode speed control(NSMSC) in order to enhance the dynamic performance and the robustness of the permanent magnet assisted synchronous reluctance motor(PMa-Syn RM) with considering the parameter uncertainties. A nonlinear sliding surface whose parameters are altering with time is designed at first. The proposed NSMSC can minimize the settling time without any overshoot via utilizing a low damping ratio at starting along with a high damping ratio as the output approaches the target set-point. In addition, it eliminates the problem of the singularity with the upper bound of an uncertain term that is hard to be measured practically as well as ensures a rapid convergence in finite time, through employing a simple adaptation law. Moreover, for enhancing the system efficiency throughout the constant torque region, the control system utilizes the maximum torque per ampere technique. The nonlinear sliding surface stability is assured via employing Lyapunov stability theory. Furthermore, a simple sliding mode estimator is employed for estimating the system uncertainties. The stability analysis and the experimental results indicate the effectiveness along with feasibility of the proposed speed estimation and the NSMSC approach for a 1.1-k W PMa-Syn RM under different speed references, electrical and mechanical parameters disparities, and load disturbance conditions.

关键词： Permanent magnet assisted synchronous reluctance motor Nonlinear sliding mode speed control Speed estimation Parameter uncertainties Sliding mode estimator

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Effect of wear debris on fretting fatigue crack initiation

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Friction 2022年第6期10卷 927-943页

作者： Shengjie WANG Tongyan YUE Dagang WANG Magd abdel WAHAB Soete Laboratory Department of Electrical EnergyMetalsMechanical Construction&SystemsFaculty of Engineering and ArchitectureGhent UniversityGhent 9052Belgium State Grid Xinyuan Maintenance Branch Beijing 100000China School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China Faculty of Engineering Van Lang UniversityHo Chi Minh City 700000Vietnam Soete Laboratory Ghent UniversityGhent 9052Belgium

Both wear and fatigue occur in fretting condition,and they interact with one another during the whole *** fatigue is commonly analysed without considering the effect of wear in partial slip regime,although wear affects the lifetime of crack *** paper investigates,for the first time,the effect of wear debris on fretting fatigue crack *** investigate the effect of debris,first fretting wear characteristics in partial slip regime are analysed for loading ***,the effect of wear on fretting fatigue crack initiation is investigated using Ruiz parameters and critical plane methods without considering the debris *** the results,we can see that loading conditions affect the wear profiles in different ***,wear has a significant effect on the fatigue in partial slip regime without considering debris especially on the crack initiation ***,considering wear debris in the analysis,its effect on critical plane parameters is *** is found that by considering the wear debris effect,the frtting fatigue crack initiation location is shifted towards the trailing *** predictions of both crack initiation location and lifetime show a good agreement with the experimental data.

关键词： fretting wear fretting fatigue critical plane Ruiz parameter debris