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Evaluation of photon beam dose calculation accuracy of treatment planning systems using in vivo dosimetry

Oncology and Translational medicine 2016年第5期2卷 234-238页

作者： mohamed Ibrahim Wahib m.attia Khaled m.Elshahat Radiation Oncology Department El Hussein Hospital Al Azahr University Physics Department Faculty of Sciences Suez Canal University

Objective The treatment planning system currently represents one of the basics of radiation therapy,because it is the only method to estimate patient dose delivery fast forward and accurately represent estimated tumor location of the tumor with the possibility of estimating densities in the tissue surrounding the tumor to overcome dose calculation defects but radial estimated the *** the flaws associated with the systems and calculates the dose of your programs in all programs currently existing in the *** necessary,to the existence of a review of the accuracy of accounts and how to confirm the radiation dose to the patient *** A total of 35 cancer patients were considered for this study,with 245 field measurements made with low-and high-energy diode detectors for brain and prostate *** treatments for all patients were planned using Eclipse Treatment Planning System version *** Of the 105 field measurements made for the prostate cancer patients,16 included discrepancies outside the ±5% action *** the 145 measurements taken of the brain cases,there were four outside the ±5% action *** results indicated a higher degree of *** study revealed that,for the prostate measurements,the higher discrepancy in the doses for the particular fields(exceeding the action level) may have been due to the isocenter being very close to the jaws and multi-leaf collimator of the linear accelerator *** a result,scatter from the jaws and the multi-leaf collimator could have contributed to the high dose delivered to the diode;hence,a probable higher discrepancy of the dose in more brain cases due highest quality of VmAT technique and fixation *** A greater percentage of the observed discrepancies were well within the set tolerance ***,it is recommended that the positioning of the diode on the patient's skin and the angular sensitivity of the diodes be *** is also recommended that a m

关键词： diodes in vivo dosimetry radiotherapy dose verification

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Impact of cigarette smoking on response to interferon therapy in chronic hepatitis C Egyptian patients

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World Journal of Gastroenterology 2004年第20期10卷 2963-2966页

作者： A.EI-Zayadi Osaima Selim H.Hamdy A.EI-Tawil Hanaa m.Badran m.attia A.Saeed Departments of Tropical medicine Ain Shams UniversityCairoEgypt Department of Clinical Pathology Ain Shams UniversityCairoEgypt Department of Pathology Ain Shams UniversityCairoEgypt Department of Hepatology National Liver InstituteMenoufeyaEgypt Department of Hepatology and Gastroenterology Theodor Bilharz Research InstituteCairoEgypt Cairo Liver Center GizaEgypt

AIm:Smoking may affect adversely the response rate to interferon-α.Our objective was to verify this issue among chronic hepatitis C patients. mETHODS:Over the year 1998,138 chronic hepatitis C male Egyptian patients presenting to Cairo Liver Center, were divided on the basis of smoking habit into:group I which comprised 38 smoker patients(>30 cigarettes/d) and group Ⅱ which included 84 non-smoker patients. Irregular and mild smokers(16 patients)were excluded. Non eligible patients for interferon-α therapy were excluded from the study and comprised 3/38(normal ALT)in group I and 22/84 in group Ⅱ(normal ALT,advanced cirrhosis and thrombocytopenia).Group I was randomly allocated into 2 sub-groups:group Ia comprised 18 patients who were subjected to therapeutic phlebotomy while sub-group Ib consisted of 17 patients who had no *** sub-group la,3 patients with normal ALT after repeated phlebotomies were excluded from the ***-α 2b 3 mU/TIW was given for 6 mo to 15 patients in group Ia,17 patients in group Ib and 62 patients in group Ⅱ. Biochemical,virological end-of-treatment and sustained responses were evaluated. RESULTS:At the end of interferon-α treatment,ALT was normalized in 3/15 patients(20%)in group Ia and 2/17 patients(11.8%)in group Ib compared to17/62 patients (27.4%)in group Ⅱ(P=0.1).Whereas 2/15 patients(13.3%) in group *** 2/17 patients(11.8%)in group Ib lost viraemia compared to 13/62 patients(26%)in group Ⅱ (P=0.3).Six months later,ALT was persistently normal in 2/15 patients(13.3%)in group 1a and 1/17 patients (5.9%)in group Ib compared to 9/62 patients(14.5%)in group Ⅱ(P=0.47).Viraemia was eliminated in 1/15 patients (6.7%)in group Ia and 1/17 patients(5.9%)in group Ib compared to 7/62 patients(11.3%) in group Ⅱ,but the results did not mount to statistical significance(P=0.4). CONCLUSION:Smokers suffering from chronic hepatitis C tend to have a lower response rate to interferon-α compared to *** phlebotomy imp

关键词： Alanine Transaminase Antiviral Agents Disease Progression Drug Interactions Hepatitis C, Chronic Humans Interferon-alpha Liver male Phlebotomy Polycythemia Smoking

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Seed Priming with Potassium Nitrate Can Enhance Salt Stress Tolerance in maize

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Phyton-International Journal of Experimental Botany 2024年第8期93卷 1819-1838页

作者： Bushra Rehman Asma Zulfiqar Houneida attia Rehana Sardar muneera A.Saleh Khalid H.Alamer Ibtisam m.Alsudays Faisal mehmood Qamar uz Zaman Institute of Botany University of the PunjabLahore54590Pakistan Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Botany Emerson UniversityMultan60000Pakistan Biological Sciences Department Faculty of Science and ArtsKing Abdulaziz UniversityRabigh21911Saudi Arabia Department of Biology College of ScienceQassim UniversityBurydah52571Saudi Arabia Department of Chemistry Sciences The University of LahoreLahore54590Pakistan Department of Environmental Sciences The University of LahoreLahore54590Pakistan

Salinity is a major abiotic stress that hinders plant development and productivity and influences agricultural *** priming is a technique used to boost germination and seedling growth under abiotic stress.A pot experiment was conducted to evaluate the impact of seed priming with potassium nitrate(KNO_(3))at various levels(0%,0.50%,1.00%and 1.50%)under salt stress(0,75,100 mm NaCl)on two maize verities(mNH360 and 30T60)for the growth,development and metabolic attributes results revealed that in maize variety mNH360,KNO_(3)priming’s significantly enhanced growth parameters than in maize variety 30T60 under control and salt-stressed *** with KNO_(3)enhanced carotenoids and total chlorophyll in the 30T60 variety that protected the maize plants from salt ***,it was shown that priming with 1.00%KNO_(3)acts as safeguarded to protect them from oxidative damage by salt stress minimizing reactive oxygen species(ROS)formation through increased levels of malondialdehyde(mDA),catalase(CAT),peroxidase(POD),ascorbate peroxidase(APX),and total soluble *** findings of the present study confirm that the use of the KNO_(3)seed priming technique is a lowcost,environmentally friendly technique for mitigating adverse impacts of salt stress in maize crops by activating the antioxidant defense system and improving chlorophyll and osmolyte contents.

关键词： Salinity Zea mays antioxidant enzymes growth seedlings oxidative damage

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Optimization of Cooperative Relayingmolecular Communications for Nanomedical Applications

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Computer modeling in Engineering & Sciences 2024年第2期138卷 1259-1275页

作者： Eman S.attia Ashraf A.m.Khalaf Fathi E.Abd El-Samie Saied m.Abd El-atty Konstantinos A.Lizos Osama Alfarraj Heba m.El-Hoseny Department of Electrical Engineering Faculty of EngineeringMinia UniversityMinia61111Egypt Department of Electronics and Electrical Communications Engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt Department of Informatics Faculty of Mathematics and Natural SciencesUniversity of Oslo(UiO)OsloNorway Computer Science Department Community CollegeKing Saud UniversityRiyadh11437Saudi Arabia Department of Computer science The Higher Future Institute for Specialized Technological StudiesEl ShoroukEgypt

Recently,nano-systems based on molecular communications via diffusion(mCvD)have been implemented in a variety of nanomedical applications,most notably in targeted drug delivery system(TDDS)***,because the mCvD is unreliable and there exists molecular noise and inter symbol interference(ISI),cooperative nano-relays can acquire the reliability for drug delivery to targeted diseased cells,especially if the separation distance between the nano transmitter and nano receiver is *** this work,we propose an approach for optimizing the performance of the nano system using cooperative molecular communications with a nano relay scheme,while accounting for blood flow effects in terms of drift *** fractions of the molecular drug that should be allocated to the nano transmitter and nano relay positioning are computed using a collaborative optimization problem solved by themodified Central Force Optimization(mCFO)*** the previous work,the probability of bit error is expressed in a closed-form *** is used as an objective function to determine the optimal velocity of the drug molecules and the detection threshold at the nano *** simulation results show that the probability of bit error can be dramatically reduced by optimizing the drift velocity,detection threshold,location of the nano-relay in the proposed nano system,and molecular drug budget.

关键词： Nanomedical system molecular communication cooperative relay optimization

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Review on Sol-Gel Derived Coatings: Process, Techniques and Optical Applications

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Journal of materials Science & Technology 2002年第3期18卷 211-218页

作者： S.m.attia JueWANG 等 PohlInstituteofSolidStatePhysics TongjiUniversityShanghai200092China Phys.Dept.FacultyofEducation KaferEl-SheikhEgypt

Sol-gel process is one of the simplest techniques to manufacture thin films. The quality of the prepared films depends on the parameters of the sol-gel process and the used technique for deposition. A great variety of the sol-gel derived films have been prepared for different applications. We present a review on the sol-gel derived coatings. The description of the process is introduced in details. Different sol-gel deposition techniques are mentioned. The optical applications of the sol-gel derived coatings are reviewed.

关键词： Sol-gel process Coating Thin film

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Tribological Characterization of Hybrid metal matrix Composites Processed by Powder metallurgy

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Acta metallurgica Sinica(English Letters) 2017年第8期30卷 781-790页

作者： m. megahed m. A. attia m. Abdelhameed A. G. El-Shafei Department of mechanical Design and Production Engineering Faculty of EngineeringZagazig UniversityP.O.Box 44519ZagazigEgypt

Aluminum （Al）-based aluminum oxide （Al2O3） and silicon carbide （SIC） particles hybrid metal matrix com- posites were processed by powder metallurgy technique, followed by sintering at 500 ℃ and then hot extrusion. The tribological properties of these composites with different weight fractions of Al2O3 and SiC were investigated; extrusion process significantly reduces the extent of porosity after cold compaction and sintering processes. Hybridization of the two reinforcements improved hardness and wear resistance of the composites. With an increase in SiC content, hardness was increased and consequently the wear resistance was enhanced also. Scanning electron microscopy observations show a better interfacial bond between matrix and reinforcements and a better distribution of the reinforcements.

关键词： Hybrid metal matrix composite Powder metallurgy Abrasive wear Hardness Porosity

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Spontaneous ejaculation after spinal cord trauma

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Asian Journal of Andrology 2010年第4期12卷 609-610页

作者： Hossam A. Yasien Abdalla m. attia Department of Dermatology Andrology ＆ STDs Faculty of Medicine Menoufiya University Menoufiya 32511 Egypt

I am Dr Hossam A. Yasien, from the Department of Dermatology, Andrology ＆ STDs, Faculty of medicine, menoufiya University, menoufiya, Egypt. Spinal cord lesions in humans are associated with impaired ejaculation [1], suggesting that the effects of descending pathways on the spinal ejaculatory mechanism are predominantly excitatory. In rodents, however, there may be an additional and important descending inhibitory pathway [2]. We report a case of a patient in whom a spinal trauma was unusually associated with spontaneous ejaculation.

关键词： ejaculation spinal trauma

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Analytical and Approximate Solutions for Complex Nonlinear Schr?dinger Equation via Generalized Auxiliary Equation and Numerical Schemes

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Communications in Theoretical Physics 2019年第11期71卷 1267-1274页

作者： mostafa m.A.Khater Dian-Chen Lu Raghda A.m.attia mustafa Inc Department of mathematics Faculty of ScienceJiangsu UniversityChina Science Faculty Firat University23119 ElazigTurkey

This article studies the performance of analytical, semi-analytical and numerical scheme on the complex nonlinear Schr¨odinger(NLS) equation. The generalized auxiliary equation method is surveyed to get the explicit wave solutions that are used to examine the semi-analytical and numerical solutions that are obtained by the Adomian decomposition method, and B-spline schemes(cubic, quantic, and septic). The complex NLS equation relates to many physical phenomena in different branches of science like a quantum state, fiber optics, and water waves. It describes the evolution of slowly varying packets of quasi-monochromatic waves, wave propagation, and the envelope of modulated wave groups, respectively. moreover, it relates to Bose-Einstein condensates which is a state of matter of a dilute gas of bosons cooled to temperatures very close to absolute zero. Some of the obtained solutions are studied under specific conditions on the parameters to constitute and study the dynamical behavior of this model in two and three-dimensional.

关键词： complex NLS equation generalized auxiliary equation method adomian decomposition method B-splines schemes(cubic&quintic&septic)

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Efficient maximum power point tracker based on neural network and sliding-mode control for buck converters

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Clean Energy 2022年第5期6卷 716-725页

作者： Hussain attia Khaled Hossin Department of Electrical and Electronic Engineering American University of Ras Al KhaimahRas Al KhaimahUnited Arab Emirates Department of mechanical and Industrial Engineering American University of Ras Al KhaimahRas Al KhaimahUnited Arab Emirates

This paper presents detailed design steps of an effective control system aiming to increase the solar energy harvested via photovoltaic power-generation *** design of an intelligent maximum power point tracker(mPPT)supported by a robust sliding-mode(Sm)controller is discussed in this *** proposed control scheme is designed to track the mPP and provide a smooth system response by removing the overshoot in the load current during any variation in the connected *** a system is suitable for DC-DC buck converter *** study begins with modelling the buck converter for a continuous current mode *** reference voltage of the tracking system is produced by the proposed neural network(NN)*** proposed intelligent mPPT integrated with an Sm controller is simulated in a mATLAB®/Simulink®*** simulation results are analysed to investigate and confirm the satisfaction level of the adopted four-serially connected PV-modules *** system performance is evaluated at a light intensity of 500 W/m^(2) and an ambient temperature of 25°*** only the proposed NN algorithm guarantees the mPP tracking response by delivering 100 W at a resistive load of 13Ω,and 200 W at a load of 6.5Ω,respectively,with 99.77%system ***,this simultaneously demonstrates a current spike of~0.5 A when the load is varied from 50%to 100%.The integrated Sm controller demonstrates a robust and smooth response,eliminating the existing current spike.

关键词： photovoltaic panel neural network algorithm mPPT sliding-mode controller buck converter

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Numerical solutions of nonlinear fractional Wu-Zhang system for water surface versus three approximate schemes

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Journal of Ocean Engineering and Science 2019年第2期4卷 144-148页

作者： mostafa m.A.Khater Raghda A.m.attia Dianchen Lu Department of mathematics Faculty of ScienceJiangsu UniversityChina Department of Basic Science Higher technological institute 10 th of Ramadan cityEgypt

This paper examines the effects of three distinct numerical schemes(Adomian Decomposition,quintic&septic Spline methods)to investigate semi-analytical and approximate solutions on Wu-Zhang(ZW)*** describes the(1+1)-dimensional dispersive long wave in two horizontal directions on shallow *** ZW model is one of the fractional nonlinear partial differential *** derivatives properties are employed to convert the nonlinear fractional partial differential equation into an ordinary differential equation with integer order so as to obtain the approximate solutions for this *** solutions obtained for each technique were compared to reveal their relationship to their characteristics illustrated under the suitable choice of the parameters *** obtained solutions showed the power,easiness,and effectiveness of these methods on nonlinear partial differential equations.

关键词： Fractional nonlinear Wu-Zhang system Conformable fractional derivatives Numerical schemes.

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