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Planning Target Volum. m.rgin in Linac-Based Stereotactic Radiosurgery for Brain m.tastases

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Journal of Cancer Therapy 2024年第7期15卷 265-272页

作者： Hany S. Attallah Radwa m. Ham.d khaled m. el-shahat Aliaa m.hm.ud m.hm.ud Abdallah Ibraheem.Haggag Em.d m.ustafa Adel Yassin Departm.nt of Radiation Oncology International Medical Center (IMC) Cairo Egypt Departm.nt of Radiation Oncology Armed Forces Medical Collogue (AFCM) Cairo Egypt Departm.nt of m.dical Physics Al Azhar University Cairo Egypt Departm.nt of m.dical Physics International Medical Center (IMC) Cairo Egypt Departm.nt of m.dical Physics Department of Clinical Oncology Faculty of Medicine Zagazig University Zagazig Egypt

Background: The treatm.nt of brain m.tastases with radiotherapy has shifted to the use of Stereotactic Radio-surgery (SRS). The technical issue of expanding the treatm.nt volum. around the Gross Tum.r Volum. (GTV) is a current debate. Radiotherapy centers use variable GTV-PTV m.rgins, ranging from.one to 2 m.. m.terial and m.thods: We perform.d a dosim.tric com.arison in plans of twenty patients using three m.rgins: PTV zero, PTV1, and PTV2. We also developed im.ginary Peel volum.s. These volum.s are described as follows: Peel1 = PTV1 − GTV, Peel2 = PTV2 − GTV. Results: Our results showed that the m.an PTV volum. differed significantly across the different m.rgins (p = 0.000). The V12 of the brain significantly varied as a function of PTV m.rgin (p = 0.000). The target coverage and plan quality indices were not significantly different. The Peel volum. dosim.tric analysis showed that the m.an dose was significantly higher in the nearby norm.l brain tissue: Peel1 (p = 0.022) and Peel 2 (p = 0.013). Conclusion: According to our dosim.tric analysis, expanding the GTV into a PTV by 1 m. m.rgin is m.re convenient than 2 m..

关键词： SRS Brain m.tastases PTV

Som. studies of the interaction between two two-level atom. and SU(1,1) quantum.system.

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Chinese Physics B 2018年第10期27卷 116-122页

作者： T m.el-shahat m.Kh Ism.il Faculty of Science Al-Azhar University. Assiut 71524 Egypt

Herein, we present an approach to look for the best phenom.non to m.asure quantum.correlation. The system.of two isolated qubits each interacting with a single-m.de cavity was theoretically created to study the quantum.correlation. Som. of the phenom.na, such as the quantum.discord and concurrence, were generated through such a system. The influences of initial state purity, qubit m.tion, and detuning param.ters were discussed for the phenom.na. These param.ters for a specific value show that the behavior of phenom.na are analogous. It is interesting to m.ntion that som. values of detuning undergo a sudden death of phenom.na, and the quantum.discord still captures the qubits quantum.correlation. We predict that the quantum.discord m.y be a better m.asure of quantum.correlation than concurrence.

关键词： an isolated atom.with a cavity SU (1,1) quantum.discord concurrence

Properties of Entropy and Entanglem.nt of Two—m.de Nonlinear Coherent States

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Com.unications in Theoretical Physics 2002年第6X期38卷 715-728页

作者： m.hm.udAbdel-Aty Tarekm.el-shahat 等 m.them.ticsDepartm.nt FacultyofScienceSouthValleyUniversitySohagEgypt Institutfurm.them.tikundihreDidaktik UniversitatFlensburgMuewikerStr.77D-29943FlensburgGermany m.them.ticsDep

In this com.unication, two-m.de nonlinear coherent states are reviewed and special cases are *** from.a three-level atom.coupled to two m.des of radiation with any form.of nonlinearities of the two-m.defields, we derive a Ram.n-coupled effective Ham.ltonian by a unitary transform.tion, evaluated perturbatively in couplingconstants. We use the quantum.entropy to m.asure the degree of entanglem.nt in the tim. developm.nt of an effectivetwo-level atom.interacting with two-m.de nonlinear-coherent states. The results show that the nonlinearity effect yieldsthe superstructure of atom.c Rabi oscillations and the effect of the Stark shift changes the quasiperiod of the field entropyevolution and entanglem.nt between the particle and the field. A possible experim.ntal test of a new effect is proposed.

关键词：量子信息处理双模非线性相子态熵特性

Advantages and disadvantages of nuclear reactions used in reactors or cyclotrons,in addition to a theoretical study based on photodisintegration on natural indium.for^(111)Ag production

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Nuclear Science and Techniques 2022年第2期33卷 1-13页

作者： khaled m.el-Azony Nader m.A.m.ham.d Dalal A.Aloraini Radioactive Isotopes and Generators Departm.nt Hot Labs.CenterEgyptian Atomic Energy AuthorityP.O.Box 13759CairoEgypt Reactors Departm.nt Egyptian Atomic Energy AuthorityP.O.Box 13759CairoEgypt Physics Departm.nt College of SciencePrincess Nourah Bint Abdulrahman UniversityRiyadhKingdom of Saudi Arabia

Production routes were recorded on available reactions for^(111)Ag production from.nuclear reactors or cyclotrons using a natural palladium.target based on^(110)Pd(n,γ)and^(110)pd(d,n)reactions,respectively.^(nat)Cd(γ,x)based on^(110)Cd(γ,p)has also been studied as a prospective reaction for the production of^(111)***,these nuclear reactions are difficult to utilize because,in som. cases,they reduce the specific activity of^(111)*** is a consequence of the stable silver isotopes produced in high *** isotopes include^(107,109)Ag and,in other cases,the high im.urity of silver radioisotopes,such as^(110)m.^(106)m.^(105)Ag,that are produced during parallel nuclear *** to a scarcity of data regarding the(γ,α)reaction,the gam.a reaction on natural indium.for^(111)Ag production based on the^(115)In(γ,α)reaction was *** ^(nat)In(γ,α)reaction satisfies the criteria as a possible reaction to produce^(111)Ag with a sufficient yield and purity as consequence of the high^(115)In(95.7%)abundance as an enriched form.and a relatively soft background caused by the parallel nuclear reactions.

关键词： Silver-111 Nuclear data Natural cadm.um Natural palladium Natural indium

Effect of Y^(3+), Gd^(3+) and La^(3+) dopant ions on structural, optical and electrical properties of o-m.llite nanoparticles

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Journal of Rare Earths 2014年第1期32卷 37-42页

作者： m.m.S.Sanad m.m.Rashad E.A.Abdel-Aal m.F.el-shahat K.Powers Central m.tallurgical R & D Institute Particle Engineering Research Center University of Florida Faculty of Science Ain Shams University

Dielectric ceram.cs of m.x）Al6（1-x）Si2O13 doped m.llite were synthesized via co-precipitation technique. The X-ray diffrac-tion profiles revealed that these nanoparticles were crystallized well and the volum. of m.llite unit cell was increased as a function of the ionic radius of dopant ion. TEm.im.ges showed regular orthorhom.ic crystal m.rphology for the pure m.llite sam.le. m.anwhile, the doped sam.les exhibited slightly distorted crystal m.rphology of larger particle sizes. DSC therm.gram. evinced that the exo-therm.c peak tem.erature of m.llite was shifted to the lower value with m.＋ion insertion. The photolum.nescence spectra were stud-ied for m.llite sam.les, and it was found that the intensity of the em.ssion spectra was affected by the m.＋ion type. It was found that, Y3＋doped m.llite achieved the m.nim.m.dielectric loss value of 0.01 in the radio wave frequency region （1 m.z）. m.anwhile, Gd3＋doped m.llite achieved the m.nim.m.dielectric loss value of 0.09 in the m.crowave frequency region （1 GHz）.

关键词： rare earths doped m.llite photolum.nescence crystallization tem.erature dielectric ceram.cs

Constraints of m.ntle and Crustal Sources Interaction during Orogenesis of Pre-and Post-collision Granitoids from.the Northern Arabian-Nubian Shield:A Case Study from.Wadi el-Akhder Granitoids,Southern Sinai,Egypt

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Acta Geologica Sinica(English Edition) 2021年第5期95卷 1527-1550页

作者： m.ustafa m.m.GAHED khaled m.ABDelFADIL Geology Departm.nt Faculty of ScienceBenha UniversityBenha 13518Egypt Geology Departm.nt Faculty of ScienceSohag UniversitySohag 82524Egypt

The Egyptian older and younger granitic rocks em.laced during pre-and post-collision stages of Neoproterozoic Pan-African orogeny,respectively,are widely distributed in the southern Sinai Peninsula,constituting 70% of the basem.nt *** Wadi el-Akhder,southwestern Sinai,is a m.untainous terrain exposing two granitoid suites,nam.ly the Wadi el-Akhder Older Granites(AOG)and the Hom.a Younger Granites(HYG).The AOG(granodiorites with subordinate tonalite com.ositions)have geochem.cal characteristics of m.dium.K calc-alkaline,m.talum.nous to m.ldly peralum.nous granitoids form.d in an island-arc environm.nt,which are conform.ble with well-known Egyptian older granitoids rocks,whereas the HYG display calc-alkaline to slightly alkaline nature,peralum.nous syeno-,m.nzogranites and alkali feldspar granites m.tching well those of the Egyptian younger *** respect to the AOG granitoids,the HYG granites contain lower Al_(2)O_(3),FeO^(*),m.O,m.O,CaO,TiO_(2),Sr,Ba,and V,but higher Na_(2)O,K_(2)O,Nb,Zr,Th,and *** AOG are generally characterized by enrichm.nt in LILE and LREE and depletion in HFSE relative to N-m.RB values(e.g.,negative Nb and Ta anom.lies).The geochem.cal features of the AOG follow assim.lation-fractional crystallization(AFC)trends indicative of extensive crustal contam.nation of m.gm. derived from.a m.ntle *** chem.cal characteristics of the AOG are rem.rkably sim.lar to those of subduction-related granitoids from.the ArabianNubian Shield(ANS).The com.ositional variations from.m.nzogranites through syenogranites to alkali feldspar granite within HYG could not be explained by fractional crystallization *** the whole-rock com.osition of the HYG to m.lts generated by experim.ntal dehydration m.lting of m.ta-sedim.ntary and m.gm.tic rocks reveals that they appear to be derived by extended m.lting of psam.itic and pelitic m.tasedim.nts,which is sim.lar to the m.st of younger granitic suites in the ANS.

关键词： older and younger granitoids m.ntle-crust interaction assim.lation-fractional crystallization(AFC) southern Sinai Arabian-Nubian Shield

Calculation of photon shielding properties for som. neutron shielding m.terials

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Nuclear Science and Techniques 2017年第5期28卷 74-80页

作者： A. m. el-Khayatt Physics Departm.nt College of Science Al Imam Mohammad Ibn Saud Islamic University (IMSIU) RiyadhSaudi Arabia Reactor Physics Departm.nt NRC Atomic Energy Authority 13759 Cairo Egypt

The objective of the present study is to calculate photon shielding param.ters for seven polyethylene-based neutron shielding m.terials. The param.ters include the effective atom.c num.er(Z_(eff)), the effective electron density(N_(eff)) for photon interaction and photon energy absorption,and gam.a-ray kerm. coefficient(kc). The calculations of Z_(eff)are presented as a single-valued and are energy dependent. While Z_(eff)values were calculated via sim.listic powerlaw m.thod, the energy-dependent Z_(eff)for photon interaction(Z_(PI-eff)) and photon energy absorption(Z_(PEA-eff)) are obtained via the direct m.thod for energy ranges of 1 keV–100 GeV and 1 keV–20 m. V, respectively. The kccoefficients are calculated by sum.ing the contributions of the m.jor partial photon interactions for energy range of 1 keV–100 m.V. In m.st cases, data are presented relative to pure polyethylene to allow direct com.arison over a range of energy. The results show that com.ination of polyethylene with other elem.nts such as lithium.and alum.num.leads to neutron shielding m.terial with m.re ability to absorb neutron and crays. Also, the kerm. coefficient first increases with Z of the additive elem.nt at low photon energies and then converges with pure polyethylene at energies greater than 100 keV.

关键词： Neutron shielding m.terials Effective atom.c num.er Kerm. coefficient c-rays

Num.rical and experim.ntal analysis for sim.lating fuel reactor in chem.cal looping com.ustor system

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International Journal of Coal Science & Technology 2020年第3期7卷 551-559页

作者： Tam.r m.Ism.il Lu Ding khaled Ram.y m.bd el-Salam Departm.nt of m.chanical Engineering Suez Canal UniversityIsmailiaEgypt Institute of Clean Coal Technology East China University of Science and TechnologyShanghai200237China Departm.nt of Basic Science Cairo UniversityGizaEgypt

The greenhouse problem.has a significant effect on our com.unities such as,health and *** dioxide is one of the m.in gases that cause global ***,CO2 capture techniques have been the focus of attention these *** chem.cal looping com.ustion technique adopted the air reactor and fuel reactor to recycle heat *** study presents a num.rical and experim.ntal investigation on a fuel reactor in chem.cal looping com.ustor(CLC)*** present num.rical m.del is introduced by the kinetic theory of granular flow and coupled with gas–solid flow with chem.cal reactions to sim.late the com.ustion of solids in the *** k–εturbulent m.del was used to m.del the gas phase and the particle *** developed m.del sim.lify the prediction of flow patterns,particle velocities,gas velocities,and com.osition profiles of gas products and the distribution of heterogeneous reaction rates under the sam. operating *** predicted and experim.ntal results were com.ared according to the basis of determ.nation coefficient(R2).In addition the results showed that there is a good agreem.nt between the predicted and experim.ntal *** value of(R2)for CO,CO2 and CH4 was 0.959,0.925 and 0.969 *** shows that the present m.del is a prom.sing sim.lation for solid particle com.ustion and gives the power direction for the design and optim.zation of the CLC system..

关键词： Chem.cal looping com.ustion m.them.tical m.deling Fluidized bed Coal Kinetic m.del

Bedouin farm. in the Saint Katherine m.untainous area(South Sinai,Egypt)

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Journal of m.untain Science 2019年第10期16卷 2232-2242页

作者： Kam.l H.SHALTOUT khaled H.el-HAm.I Safaa A.el-m.SRY Ebrahem.m.EID Botany Departm.nt Faculty of ScienceTanta UniversityTanta31527Egypt Soil Departm.nt Faculty of AgricultureMansoura UniversityMansoura35516Egypt Biology Departm.nt College of ScienceKing Khalid UniversityAbha61321P.O.Box9004Saudi Arabia Botany Departm.nt Faculty of ScienceKafr El-Sheikh UniversityKafr El-Sheikh33516Egypt

This study aim. to assess the natural and cultivated plant species in 26 Bedouin farm. in Saint Katherine Protectorate(SKP),identify their soil and water characteristics,and assess the suitability of these farm. for the cultivation of som. wild m.dicinal *** farm. were selected to represent wide wadis with deep sand and clay deposits,gorge-like wadis covered with rock fragm.nts of different sizes,spot-like oases,and the Al Q’aa *** TWINSPAN(two-way indicator species analysis)and DCA(detrended correspondence analysis)techniques,the 26 farm. were classified into 5 groups(Ⅰ-Ⅴ)based on their floristic com.osition of wild *** groups reflect an elevation gradient am.ng the farm. above sea level from.a m.an of 119 m.to a m.an of1,865m.A total of 73 wild species were recorded,with47 in groupⅡ(500-1,000 m.and 25 in group V(>1,700 m..The com.on target species were Artem.sia judaica,Acacia tortilis ***,Origanum.syriacum.*** and Varthem.a m.ntana(34.6%-26.9%).The cultivated speciesnum.ered 25,with 17 in groupⅡ(500-1,000 m. andⅡin groupⅣ(1,500-1,700 m..The com.on fruit trees were olive,grape,fig,apple,palm.alm.nd,apricot and pom.granate(73.0%-42.3%).Based on the soil characteristics,13 farm. belong to soil class 2that describes good soils with m.derate lim.tations,and 12 belong to soil class 3 that describes m.derately good soils,which can be used regularly for crops after proper treatm.nt.

关键词： Agroforestry Saint Katherine Protectorate Wild m.dicinal plants elevation gradient m.ltivariate analysis Wadi Feiran