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Power frequency AC voltage measurement based on double wound Rogowski coil

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High Voltage 2017年第2期2卷 129-135页

作者： Mohamed E.Ibrahim amr M.Abd-Elhady High Voltage and Dielectric Materials Lab. Faculty of EngineeringMenoufia UniversityShebin El_Kom 32511Egypt

This study presents a technique for power frequency AC voltage *** proposed technique utilises a capacitor having a low capacitance in addition to a double wound Rogowski *** technique depends on capacitor current measurement using the double wound Rogowski *** voltage across the capacitor that connected in parallel with the system at which AC voltage is intended to be measured is *** proposed technique is experimentally evaluated by designing the measurement system and using a digital signal processing board for the reconstruction ***,the experimental results based on Rogowski coil measurements are compared with those obtained from reference ***,the obtained results validate the efficacy of the proposed technique in power frequency AC voltage measurement.

关键词： Rogowski double capacitance

Stress and deformation of rocket gas turbine disc under different loads using finite element modelling

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Propulsion and Power Research 2013年第1期2卷 38-49页

作者： amr Elhefny Guozhu Liangng School of Astronautics Beihang UniversityBeijing 100191China

Gas turbine discs have numerous applications in the aerospace industry,such as in liquid rocket *** this study,the stresses and deformations of a turbine disc were *** goal was to highlight the stress and deformation distribution to assist in the design of a disc as well as to demonstrate the importance of using finite element(FE)analysis in simulating an actual design ***,to present the real model,a twodimensional(2D)axisymmetric model for a non-uniform disc was analysed using FE *** stresses and deformations developed as a result of the disc operating conditions at high rotational speeds and thermal gradients were evaluated using two types of heat transfer modes-conduction and convection,taking into consideration the material behaviour at elevated *** FE model revealed that the weight of the disc should be reduced optimally by using a non-uniform thickness because this results in a huge increase in the applied *** greatest stresses in the disc result from the thermal load caused by conduction,and they are located at the centre of the *** addition,an analytical method was used to evaluate and predict the stresses along the disc,and it gave a good estimate of the stress values compared to the FE *** on this estimate,a parametric study was conducted for a range of rotational velocities under high temperature loads for a series of disc ***,it was found that this method can be used for the preliminary design of different turbines.

关键词： Rocket turbine Turbine disc Stress Deformation Finite element(FE)

Effect of addition of chitosan to self-etching primer:antibacterial activity and push-out bond strength to radicular dentin

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The Journal of Biomedical Research 2012年第4期26卷 288-294页

作者： Shaymaa Elsaka amr Elnaghy Department of Dental Biomaterials Faculty of DentistryMansoura University Department of Conservative Dentistry and Endodontics Faculty of DentistryMansoura University

The purpose of this study was to evaluate the antibacterial activity of a modified self-etching primer incorporating chitosan and whether this modification affected the bond strength to radicular dentin.A modified self-etching primer was prepared by adding chitosan solutions at 0.03%,0.06%,0.12% and 0.25%（W/W） to RealSeal selfetching *** primer without chitosan was used as the *** antibacterial activity of the modified self-etching primer was evaluated using the direct contact test against Enterococcus *** bonding ability of the RealSeal system to radicular dentin was evaluated using the push-out bond strength *** modes of failure were examined under a *** were analyzed using analysis of variance（ANOVA） and Tukey’s test,with a P-value 〈 0.05 indicating statistical *** results showed that the antibacterial properties of the freshly prepared and aged modified self-etching primer incorporating chitosan exhibited potent antibacterial effect against Enterococcus faecalis compared with the unmodified *** RealSeal system with the aged modified self-etching primer incorporating chitosan showed no significant differences in the bond strength as compared with the control（P = 0.99）.The findings suggest that modified self-etching primer incorporating chitosan is a promising antibacterial primer which does not adversely affect the bond strength of the RealSeal system to radicular dentin.

关键词： Enterococcus faecalis antibacterial activity chitosan push-out primer radicular dentin

Evaluation of suturless scleral fixation with posterior chamber foldable intraocular lens implantation

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International Journal of Ophthalmology(English edition) 2019年第8期12卷 1283-1289页

作者： Ahmed MBedda Hesham FElGoweini Ahmed MAbdelhadi amr MElhady Department of Ophthalmology Alexandria UniversityAlexandria11511Egypt Department of Ophthalmology the General OphthalmologyHospitalAlexandria21515Egypt

AIM: To assess the sutureless scleral fixation technique for posterior chamber foldable intraocular lens(PCIOL) implantation in aphakic eyes with insufficient or no capsular support. METHODS: A technique for sutureless intrascleral fixation of the haptics of a standard 3-piece PCIOL was used which ensures sutureless fixation by permanent incarceration of the haptics in a scleral tunnel parallel to the limbus. All patients were evaluated for preoperative status [visual acuity, refractive error, K readings, intraocular pressure(IOP) measurement, slit lamp examination, fundus examination and optical biometry], postoperative status and complications. Ultrasound biomicroscopy(UBM) was done for 10 cases to evaluate optic tilt. RESULTS: The study evaluated 42 eyes of 42 patients. The follow-up period was 6 mo. Improvement of best corrected visual acuity(BCVA) one line occurred in 10 cases(23.8%) and loss of one line in 3 cases(7.1%). Intraoperative complications included: haptic kink in 4 cases(9.5%), haptic breakage in 1 case(2.4%), haptic dislocation in 1 case(2.4%), haptic slippage in 3 cases(7.1%), IOL dislocation in 1 case(2.4%) and sclerotomy related bleeding in 1 case(2.4%). Postoperative complications included: transient mild vitreous hemorrhage in 3 cases(7.1%), choroidal detachment in 1 case(2.4%), cystoid macular edema(CME) in 1 case(2.4%), optic capture in 1 case(2.4%), subconjunctival haptic in 2 cases(4.8%), ocular hypotony in 4 cases(9.5%) and ocular hypertension in 1 case(2.4%). There were no cases of retinal detachment or endophthalmitis. UBM showed optic tilt in 3 cases(30%). CONCLUSION: Fixation of three-piece foldable IOL haptics in scleral tunnel parallel to the limbus-providedaxial stability and proper centration of the IOL with minimal or no tilt in most cases and a low complication rate during the follow up period which lasted 6 mo.

关键词： aphakia correction sutureless scleral fixation foldable three-piece intraocular lens

T cell receptor (TCR) signaling in health and disease

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Signal Transduction and Targeted Therapy 2022年第1期7卷 38-63页

作者： Kinjal Shah amr Al-Haidari Jianmin Sun Julhash U.Kazi Division of Translational Cancer Research Department of Laboratory MedicineLund UniversityLundSweden Lund Stem Cell Center Department of Laboratory MedicineLund UniversityLundSweden Clinical Genetics and Pathology SkSne University HospitalRegion SkineLundSweden Clinical Sciences Department Surgery Research UnitLund UniversityMalmoSweden NHC Key Laboratory of Metabolic Cardiovascular Diseases Research Science and Technology centerSchool of Basic Medical SciencesNingxia Medical UniversityYinchuanChina

Interaction of the T cell receptor(TCR)with an MHC-antigenic peptide complex results in changes at the molecular and cellular levels in T *** outside environmental cues are translated into various signal transduction pathways within the cell,which mediate the activation of various genes with the help of specific transcription *** signaling networks propagate with the help of various effector enzymes,such as kinases,phosphatases,and *** of these disparate signal transduction pathways is done with the help of adaptor proteins that are non-enzymatic in function and that serve as a scaffold for various protein-protein *** process aids in connecting the proximal to distal signaling pathways,thereby contributing to the full activation of T *** review provides a comprehensive snapshot of the various molecules involved in regulating T cell receptor signaling,covering both enzymes and adaptors,and will discuss their role in human disease.

关键词： TCR connecting thereby

N1-soliton solution for Schrodinger equation with competing weakly nonlocal and parabolic law nonlinearities

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Communications in Theoretical Physics 2020年第6期72卷 129-135页

作者： Mohammed O Al-amr Hadi Rezazadeh Khalid K Ali Alper Korkmazki Department of Mathematics College of Computer Sciences and MathematicsUniversity of MosulMosul 41002Iraq Faculty of Engineering Technology Amol University of Special Modern TechnologiesAmolIran Mathematics Department Faculty of ScienceAl-Azhar UniversityNasr-CityCairoEgypt Nord StaBe 9 WeimarGermany

The nonlocal nonlinear Schr?dinger equation(NNLSE)with competing weakly nonlocal nonlinearity and parabolic law nonlinearity is explored in the current work.A powerful integration tool,which is a modified form of the simple equation method,is used to construct the dark and singular 1-soliton *** is shown that the modified simple equation method provides an effective and powerful mathematical gadget for solving various types of NNLSEs.

关键词： Schrodinger equation soliton integrability modified simple equation method

Molecular and functional characterization of the American cockroach, Periplaneta americana, Rab5： the first exopterygotan low molecular weight ovarian GTPase during oogenesis

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Insect Science 2018年第5期25卷 751-764页

作者： Mohamed Elmogy amr A. Mohamed Muhammad Tufail Tomohide Uno Makio Takeda Department of Entomology Faculty of Science Cairo University Orman Giza Egypt Department of Plant Protection College of Food and Agriculture Sciences King Saud University Riyadh Saudi Arabia Graduate School of Agricultural Science Kobe University Nada- ku Kobe Japan Laboratory of Biological Chemistry Faculty of Agriculture Department of Biofuncfional Chemistry Kobe University Nada-ku Hyogo Japan

The small Rab GTPases are key regulators of membrane vesicle trafficking. Ovaries of Periplaneta americana （Linnaeus）（Blattodea： Blattidae） have small molecular weight GTP/ATP-binding proteins during early and late vitellogenic periods of oogenesis. However, the identification and characterization of the detected proteins have not been yet reported. Herein, we cloned a cDNA encoding Rab5 from the American cockroach, P. americana, ovaries （Pamrab5）. It comprises 796 bp, encoding a protein of 213 amino acid residues with a predicted molecular weight of 23.5 kDa. Pamrab5 exists as a single-copy gene in the P. americana genome, as revealed by Southern blot analysis. An approximate 2.6 kb ovarian mRNA was transcribed especially at high levels in the previtellogenic ovaries, detected by Northern blot analysis. The muscle and head tissues also showed high levels of Pamrab5 transcript. Pamrab5 protein was localized, via immunofluorescence labeling, to germline-derived cells of the oocytes, very early during oocyte differentiation. Immunoblotting detected a ~25 kDa signal as a membrane-associated form revealed after application of detergent in the extraction buffer, and 23 kDa as a cytosolic form consistent with the predicted molecular weight from amino acid sequence in different tissues including ovary, muscles and head. The Pamrab5 during late vitellogenic periods is required to regulate the endocytotic machinery during oogenesis in this cockroach. This is the first report on Rab5 from a hemimetabolan, and presents an inaugural step in probing the molecular premises of insect oocyte endocytotic trafficking important for oogenesis and embryonic development.

关键词： endocytosis membrane trafficking oogenesis Periplaneta americana Rab5-GTPase

Design framework for robotic surgery wards at hospitals:Computational implementation

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Frontiers of Architectural Research 2020年第3期9卷 514-540页

作者： Randa M.A.Mahmoud amr M.A.Youssef Department of Architectural Ensineering Assiut UniversityAssiut 71518Egypt

Robotic surgery is one of the most recent technologies in healthcare building *** to the design complexity of Robotic surgery wards,computational implementations are being developed to either measure the effect of inserting advanced technologies as Electronic medical recorders and tele surgery,or evaluate design alternatives on healthcare *** paper presents a design framework that responds to the need for coordinating design phases for Robotic Surgery Wards(RSWs)*** proposed design framework for RSWs can generate functional RSW alternatives and more than one solution for each *** framework has been structured based on the main architectural considerations of RSWs which are geom etric and topological,the economic considerations,specific developed pools for shape and corridor patterns,and the theory of,fShape Grammars"has been utilized to compute the framework to generate a vast number of design ***,a computational implementation has been established to assist designers in early design *** validation for the applications of the developed framework and implementation has been conducted by using reference examples of *** main finding in this paper is providing healthcare building designers with a computational implementation that generates RSW alternative computationally based on specific shape and cost levels.

关键词： Robotic surgery ward design Architectural and economic design consideration Design framework Computational implementation Shape grammar

Optimal and Memristor-Based Control of A Nonlinear Fractional Tumor-Immune Model

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Computers, Materials & Continua 2021年第6期67卷 3463-3486页

作者： amr M.S.Mahdy Mahmoud Higazy Mohamed S.Mohamed Department of Mathematics College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Mathematics Faculty of ScienceZagazig UniversityZagazig44519Egypt Department of Physics and Engineering Mathematics Faculty of Electronic engineeringMenoufia UniversityMenouf32952Egypt Department of Mathematics Faculty of ScienceAl-Azher UniversityNasr City11884Egypt

In this article,the reduced differential transform method is introduced to solve the nonlinear fractional model of *** fractional derivatives are described in the Caputo *** solutions derived using this method are easy and very *** model is given by its signal flow ***,a simulation of the system by the Simulink of MATLAB is *** disease-free equilibrium and stability of the equilibrium point are *** of a fractional optimal control for the cancer model is *** addition,to control the system,we propose a novel modification of its *** modification is based on converting the model to a memristive one,which is a first time in the literature that such idea is used to control this type of ***,we study the system’s stability via the Lyapunov exponents and Poincare maps before and after *** order differential equations(FDEs)are commonly utilized to model systems that have memory,and exist in several physical phenomena,models in thermoelasticity field,and biological *** have been utilized to model the realistic biphasic decline manner of elastic systems and infection of diseases with a slower rate of *** are more useful than integer-order in modeling sophisticated models that contain physical phenomena.

关键词： RDTM tumor-immune optimal control caputo derivative signal flow simulink disease-free equilibrium stability memristive lyapunov exponents poincare map