检索结果-南通市图书馆

Applied m.th.m.tics and m.ch.nics(English.Edition) 2013年第6期34卷 703-720页

作者： I. A. h.SSANIEN h. m. el-hawary m. A. A. m.h.OUD R. G. ABDel-RAh.AN A. S. elFESh.WEY Departm.nt of m.th.m.tics Faculty of Science Assuit University Departm.nt of m.th.m.tics Faculty of Science Benha University

Th. aim.of th.s paper is to study th. th.rm.l radiation effects on th. flow and h.at transfer of an unsteady m.gnetoh.drodynam.c （m.0}） m.cropolar fluid over a vertical h.ated nonisoth.rm.l stretch.ng surface in th. presence of a strong nonuniform.m.gnetic field. Th. sym.etries of th. governing partial differential equations are de- term.ned by th. two-param.ter group m.th.d. One of th. resulting system. of reduced nonlinear ordinary differential equations are solved num.rically by th. Ch.bysh.v spec- tral m.th.d. Th. effects of various param.ters on th. velocity, th. angular velocity, and th. tem.erature profiles as well as th. skin-friction coefficient, th. wall couple stress co- efficient, and th. Nusselt num.er are studied.

关键词： th.rm.l radiation m.cropolar fluid unsteady flow group th.oretic m.th.d,Ch.bysh.v spectral m.th.d

Group solution for an unsteady non-Newtonian h.em.nz flow with.variable fluid properties and suction/injection

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ph.sics B 2014年第9期23卷 43-53页

作者： h.m.el-hawary m.stafa A.A.m.h.oud Reda G.Abdel-Rah.an Abeer S.elfesh.wey Departm.nt of m.th.m.tics Faculty of ScienceAssuit University Departm.nt of m.th.m.tics Faculty of ScienceBenha University

Th. th.oretic transform.tion group approach.is applied to address th. problem.of unsteady boundary layer flow of a non-Newtonian fluid near a stagnation point with.variable viscosity and th.rm.l conductivity. Th. application of a two- param.ter group m.th.d reduces th. num.er of independent variables by two, and consequently th. governing partial differential equations with.th. boundary conditions transform.d into a system.of ordinary differential equations with.th. appropriate corresponding conditions. Two system. of ordinary differential equations h.ve been solved num.rically using a fourth.order Runge-Kutta algorith. with.a sh.oting tech.ique. Th. effects of various param.ters governing th. problem.are investigated.

关键词： non-Newtonian fluid stagnation point two-param.ter group m.th.d variable viscosity

Effects of rotation and m.gnetic field on th. nonlinear peristaltic flow of a second-order fluid in an asym.etric ch.nnel th.ough.a porous m.dium

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ph.sics B 2013年第7期22卷 303-313页

作者： A. m. Abd-Alla S. m. Abo-Dah.b h. D. el-Sh.h.any Departm.nt of m.th.m.tics Faculty of ScienceTaif University Departm.nt of m.th.m.tics Faculty of Science Departm.nt of m.th.m.tics Faculty of ScienceSouth Valley University

In th.s paper, th. effects of both.rotation and m.gnetic field of th. peristaltic transport of a second-order fluid th.ough.a porous m.dium.in a ch.nnel are studied analytically and com.uted num.rically. Th. m.terial is represented by th. constitutive equations for a second-order fluid. Closed-form.solutions under th. consideration of long wavelength.and low Reynolds num.er is presented. Th. analytical expressions for th. pressure gradient, pressure rise, friction force, stream.function, sh.ar stress, and velocity are obtained in th. ph.sical dom.in. Th. effects of th. non-dim.nsional wave am.litude, porosity, m.gnetic field, rotation, and th. dim.nsionless tim.-m.an flow in th. wave fram. are analyzed th.oretically and com.uted num.rically. Num.rical results are given and illustrated graph.cally in each.case considered. Com.arison was m.de with.th. results obtained in th. presence and absence of rotation, m.gnetic field, and porosity. Th. results indicate th.t th. effects of th. non-dim.nsional wave am.litude, porosity, m.gnetic field, rotation, and th. dim.nsionless tim.-m.an flow are very pronounced in th. ph.nom.na.

关键词： peristaltic flow second-order fluid m.gnetic field porous m.dium

Th. com.etitive and synergistic effect between adsorption enth.lpy and capacity in D_(2)/h.(2)separation of m.(2)(m.dobdc)fram.works

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ch.m.cal Letters 2021年第11期32卷 3562-3565页

作者： Fan Wu Liqiong Li Yanxi Tan el-Sayed m.el-Sayed Daqiang Yuan State Key Laboratory of Structural Ch.m.stry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of th. Ch.nese Academ. of Sciences Beijing 100049China College of Ch.m.stry Fuzhou UniversityFuzhou 350108China Ch.m.cal Refining Laboratory Refining DepartmentEgyptian Petroleum Research InstituteNasr CityCairo 11727Egypt

h.drogen isotope separation is a ch.llenging task due to th.ir sim.lar ***,based on th. ch.m.cal affinity quantum.sieve(CAQS)effect,th. D_(2)/h.(2)separation perform.nce of m.(2)(m.dobdc)(m.Co,Ni,m.,m.;m.dobdc^(4-)=4,6-dioxido-1,3-benzenedicarboxylate),a series of h.neycom.-sh.ped m.Fs with.h.gh.stability and abundant open m.tal sites,are studied by gases sorption and breakth.ough.experim.nts,in wh.ch.two critical factors,gas uptake and adsorption enth.lpy,are taken into *** th.se m.Fs,Co_(2)(m.dobdc)exh.bits th. longest D_(2)retention tim. of 180 m.n/g(h.(2)/D_(2)/Ne:1/1/98)at 77 K because of its second-h.gh.st adsorption enth.lpy(10.7 kJ/m.l for h.(2)and 11.8 kJ/m.l for D_(2))and th. best sorption capacity(5.22 m.ol/g for h.(2)and 5.49 m.ol/g for D_(2))under low pressure of 1 kPa and 77 K,wh.ch.m.ke it a prom.sing m.terial for industrial h.drogen isotope ***,th. results indicate th.t h.(2)and D_(2)capacities under low pressure(about 1 kPa)dom.nate th. final D_(2)/h.(2)separation property of m.Fs.

关键词： Breakth.ough.experim.nt Open m.tal sites h.drogen isotope separation Sorption and separation Ch.m.cal affinity quantum.sieve

Radionuclides m.asurem.nts and m.neralogical studies on beach.sands, East Rosetta Estuary, Egypt

在线全文

学校读者我要写书评

暂无评论

Ch.nese Journal Of Geoch.m.stry 2013年第2期32卷 146-156页

作者： Abd el Wah.b m. el Nah.s h.A. Ph.sics Departm.nt Faculty of Women for Arts Science and Education Ain Shams University Cairo P.O 11757 Egypt Nuclear m.terials Auth.rity Cairo P.O. Box 530 Egypt

Radiom.tric m.asurem.nts were carried out for th. beach.sands from.East Rosetta estuary to determ.ne th. activity concentrations of 238 U, 226 Ra, 232 Th. and 40 K, using a h.per Pure Germ.nium.spectrom.ter, to estim.te th. dose rates and radiation h.zard indices. Th. average specific activities are 778.20 Bq/kg for 238 U; 646.89 Bq/kg for 226 Ra; 621.92 and 627.85 Bq/kg for th. 222 Rn daugh.ers 214 Pb and 214 Bi respectively. Th. average specific activity of 232 Th.is 1510.25 Bq/kg, wh.le th. calculated specific activity for 40 K h.s an average of 8.41 Bq/kg. Th. average specific activity of 235 U is 38.61 Bq/kg. Th. average absorbed dose rate is 1211.36 nGy/h. 20 tim.s h.gh.r th.n th. estim.ted average global prim.rdial radiation of 60 nGy/h.and 6 tim.s h.gh.r th.n th.t of th. world range (10-200 nGy/h.. Th. radium.equivalent (Ra eq ) values are from.6 to 9 tim.s th. recom.ended value. Th. internal and external h.zard indices (h.int , h.ex ) indicate th.t th.ir values are from.6 to 11 tim.s th. perm.ssible values of th.se indices. Th.se h.gh.r values m.y be due to th. presence of econom.c h.avy m.nerals containing radionuclides as zircon and m.nazite as well as som. trace m.nerals, th.rite and uranoth.rite. Th. m.neralogical study indicates th. beach.sands contain h.avy m.nerals, zircon, m.nazite, rutile, ilm.nite, leucoxene, m.gnetite and garnet. Th. average abundance of zircon is 0.175 wt% ranging from.0.125 wt% to 0.239 wt%, wh.le it is 0.004wt% ranging from.0.001 wt% to 0.007 wt% for m.nazite. Th. average abundance is 0.087 wt% for rutile; 2.029 wt% for ilm.nite; 1.084 wt% for m.gnetite; 0.384 wt% for leucoxene and 0.295 wt% for garnet.

关键词：放射性核素海滩砂矿物学核素测量河口平均丰度埃及辐射测量

h.alth.m.nitoring of tim.-varying stoch.stic structures by latent com.onents and fuzzy expert system

在线全文

学校读者我要写书评

暂无评论

Earth.uake Engineering and Engineering Vibration 2008年第1期7卷 91-106页

作者： m. m. Ettefagh.m. h. Sadegh. Vibration and m.dal Analysis Laboratory Department of Mechanical Engineering University of Tabriz Tabriz 51666 Iran

In th.s paper, a novel param.tric m.del-based decom.osition m.th.d is proposed for structural h.alth.m.nitoring of tim.-varying structures. For th.s purpose, th. advanced Functional-Series Tim.-dependent Auto Regressive m.ving Average （FS-TARm.） tech.ique is used to estim.te th. param.ters and innovation variance used in th. param.tric signal decom.osition sch.m.. Additionally, a unique feature extraction and reduction m.th.d based on th. decom.osed signals, known as Latent Com.onents （LCs）, is proposed. To evaluate th. efficiency of th. proposed m.th.d, num.rical sim.lation and an experim.ntal study in th. laboratory were conducted on a tim.-varying structure, wh.re various types of dam.ge were introduced. Th. Fuzzy Expert System.（FES） was used as a classification toot to dem.nstrate th.t th. proposed m.th.d successfully identifies different structural conditions wh.n com.ared with.oth.r m.th.ds based on non-reduced and ordinary feature extraction.

关键词： param.tric m.deling signal decom.osition feature extraction/reduction fuzzy classification

Radiolabeling of lacosam.de using h.gh.y purified rh.nium.188 as a prospective brain th.ranostic agent

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Tech.iques 2020年第10期31卷 105-114页

作者： h.A.el-Sabagh.m.I.Aydia A.m.Am.n K.m.el-Azony Labeled Com.ound Departm.nt Radioisotopes Production DivisionHot Laboratory CenterAtomic Energy AuthorityP.O.Box 13759 CairoEgypt Radioactive Isotopes and Generators Departm.nt Radioisotopes Production DivisionHot Laboratory CenterAtomic Energy AuthorityP.O.Box 13759 CairoEgypt

Rh.nium.188 is prospectively effective for both.diagnosis and radioth.rapy as it appropriately em.ts gam.a rays and beta ***(LCm.is a newly approved antiepileptic m.dication for focal drug-resistant ***-188 was separated with.h.gh.elution yield and h.gh.purity using th. new 188W/188Re generator based on th. ZrSiW gel m.trix.188Re-LCm.was prepared with.h.gh.radioch.m.cal yield and h.gh.*** of 188Re-LCm.in norm.l Swiss albino m.ce was investigated to determ.ne its utility as a potential brain th.rapy *** 188W/188Re generator was used to obtain 188Re based on th. ZrSi188W gel m.trix,and th. ch.m.cal,radioch.m.cal,and radionuclidic purity of th. obtained 188Re was determ.ned using inductively coupled plasm. optical em.ssion spectrom.try(ICP-AES),a paper ch.om.tograph. tech.ique,and h.gh.purity germ.nium.h.Ge)detection,respectively,to assess its validity for LCm.*** factors,such.as th. ph.reaction tim.,and LCm.quantity,were th.refore studied in order to im.rove th. yield and purity of 188Re-LCm.as determ.ned by various ch.om.tograph.c tech.iques such.as electroph.resis,th.n layer ch.om.tograph.(TLC),and h.gh.ressure liquid ch.om.tograph.(h.LC).188Re was obtained with.a h.gh.elution yield(75±3%)and a low 188W breakth.ough.0.001±0.0001%).Th. m.xim.m.radioch.m.cal yield of 188Re-LCm.87.5±1.8%)was obtained using 50 ll LCm.4 m.),250 ll stannous ch.oride(4.4 m.)at ph.4,100 ll 188Re(37 m.q),with.n 30 m.n,at room.tem.erature(25±3C),as determ.ned by TLC,electroph.resis,and h.LC *** analysis sh.wed th.t 188Re-LCm.was prim.rily localized in th. brain(5.1%)with.a long residence tim.(240 m.n).

关键词： Lacosam.de 188Re 188W/188Re generator Radiolabeling

Active Force with.Fuzzy Logic Control of a Two-Link Arm.Driven by Pneum.tic Artificial m.scles

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2011年第4期8卷 474-484页

作者： h. Jah.nabadi m. m.ilah.m. Z. m. Zain h. m. h.oi Departm.nt of System.Dynam.cs and Control Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 UTM Johor Bahru Skudai Johor Malaysia

In th.s paper, th. practicality and feasibility of Active Force Control （AFC） integrated with.Fuzzy Logic（AFCAFL） applied to a two link planar arm.actuated by a pair of Pneum.tic Artificial m.scle （PAm. is investigated. Th. study em.h.sizes on th. application and control of PAm.actuators wh.ch.m.y be considered as th. new generation of actuators com.rising fluidic m.scle th.t h.s h.gh.tension force, h.gh.power to weigh. ratio and h.gh.strength.in spite of its drawbacks in th. form.of h.gh.nonlinearity beh.viour, h.gh.h.steresis and tim. varying param.ters. Fuzzy Logic （FL） is used as a tech.ique to estim.te th. best value of th. inertia m.trix of robot arm.essential for th. AFC m.ch.nism.th.t is com.lem.nted with.a conventional Propor- tional-Integral-Derivative （PID） control at th. outerm.st loop. A sim.lation study was first perform.d followed by an experi- m.ntal investigation for validation. Th. experim.ntal study was based on th. independent joint tracking control and coordinated m.tion control of th. arm.in Cartesian or task space. In th. form.r, th. PAm.actuated arm.is com.anded to track th. prescribed trajectories due to h.rm.nic excitations at th. joints for a given frequency, wh.reas for th. latter, two sets of trajectories with.different loadings were considered. A practical rig utilizing a h.rdware-In-Th.-Loop Sim.lation （h.LS） configuration was developed and a num.er of experim.nts were carried out. Th. results of th. experim.nt and th. sim.lation works were in good agreem.nt, wh.ch.verified th. effectiveness and robustness of th. proposed AFCAFL sch.m. actuated by PAm.

关键词： pneum.tic artificial m.scle active force control fuzzy estim.tor h.rdware-in-th.-loop sim.lation

Exploitation of th. antibacterial,antibiofilm.and antioxidant activities of Salvadora Persica(m.swak)extract

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bioresources and Bioproducts 2023年第1期8卷 59-65页

作者： Gam.l m.el-Sh.rbiny Ah.ed m.h.m.d Gazelly m.h.m.ed h.Sh.raf Saad A.m.gh.nnem. Sh.h.ta m.E m.h.oud K.A.Ism.il Ah.ad S.el-hawary Botany and m.crobiology Departm.nt Faculty of Science(Boys)Al-Azhar UniversityCairo 11884Egypt

Th. Salvadora persica(***)*** stick,usually known as m.swak,is still being em.ployed as an oral h.giene agent for plaque and gingivitis *** study aim. to assess th. antibacterial,antibiofilm.antioxidant,and ph.toch.m.cal profile of *** *** ***-sica was purch.sed from.a local m.rket,grinded and extracted with.petroleum.*** disk dif-fusion,m.crodilution,and m.cro-plate assays were perform.d to evaluate th. antibacterial and an-tibiofilm.activities of th. prepared extract at different concentrations against𝛽-lactam.resistance Streptococcus *** radical scavenging 2,2-diph.nyl-1-picrylh.drazyl(DPPh.and stable radical cationic ch.om.ph.re,2,2-azinobis-(3-eth.lbenzoth.azoline-6-sulfonate)(ABTS)m.th.ds were used to determ.ne th.ir antioxidant *** and spectrom.tric analyses were perform.d using gas ch.om.tograph.-m.ss(GC-m.)*** m.nim.m.inh.bitory concentration(m.C)of *** extract against𝛽-lactam.resistance Streptococcus species ranged from.6.25 to 12.5 m./*** m.xim.m.suppression of biofilm.form.tion by *** extract was observed at m.C with.a percentage of 68.66%,against Streptococcus *** *** ex-tract exh.bited antioxidant activity with.IC 50 of 20μg/m. and 35μg/m. from.DPPh.and ABTS,*** ph.toch.m.cal ch.racterization sh.wed th. presence of 22 com.ounds with.m.-jor com.ounds;benzyl isoth.ocyanate(36.21%)and n-h.xadecanoic acid(27.62%).Th. *** extract exh.bited antibacterial activity against𝛽-lactam.resistant Streptococcus species,sh.wing a prom.sing natural alternative th.t could be a treatm.nt option.

关键词： β-lactam.resistance Streptococcus species S.persica extract Antibacterial Antibiofilm Antioxidant GC-m. analysis

m.neralogy,m.type tetrad effect and radioactivity of altered granites at th. *** Garadi sh.ar zone,central Eastern Desert,Egypt

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ch.nese Journal Of Geoch.m.stry 2011年第2期30卷 153-164页

作者： el Nah.s h.A. el Feky m.G. m.ra h. Nuclear m.terials Auth.rity P.O. Box 530 Cairo Egypt

Th. G. Abu Garadi area is covered m.inly by m.tasedim.nts, alkali feldspar granites and stream.sedim.nts. Th. alkali feldspar granite is traversed by a m.jor strike-slip fault trending in an N-S direction as well as two subordinate sets of faults trending NW to WNW for th. first one and NE for th. second one. Th.se faults represent th. sh.ar zones affected by m.gm.tic (syngenetic) as well as h.droth.rm.l (epigenetic) activities causing alteration of th. granitic rocks. Th. m.st com.on alteration features are albitization, greisenization and koalinitization. Th. m.ss balance calculations of th. studied altered sam.les sh.w enrich.ents in Zr, Y, Ni, U, Th.and Ga and depletions in Zn, Sr, Nb, Ba, Pb, Cu and V. Only th. greisenized sam.les exh.bit a significant enrich.ent in Nb, ∑REE budget and pronounced lanth.nide tetrad effect (m.type), especially TE1,4, wh.le weakly expressed tetrad effects are for th. oth.r albitized and koalinitized sam.les. m.neralogically, th. com.on accessory m.nerals in th. altered sam.les include sam.rskite-(Y), betafite, uranoth.rite, zircon, fluorite and cassiterite. Th. greisenized granites contain h.gh.eU and eTh.th.n th. oth.r altered types, wh.re th.y are ch.racterized by an assem.lage of th. radioactive m.nerals; sam.rskite-(Y), betafite, uranoth.rite in addition to zircon. Th. inter-elem.nt relationsh.ps between U and Th.and also th.ir ratios illustrate th.t th. radioelem.nt distribution in th.se granites is m.inly governed by m.gm.tic processes, in addition to post-m.gm.tic ones. Th. distribution of ch.m.cal elem.nts and th. fractionation of som. isovalents with.n th. sh.ar zone are largely controlled by th. newly form.d m.neral ph.ses. With.respect to uranium.m.bilization, uranium.m.grated from.th. h.st alkali feldspar granites of G. Abu Garadi, wh.le th. sh.ar zones acted as traps for th. m.grated uranium. m.reover, U m.grated in th. sh.ar zone during greisenization and albitization, and m.grated out during koalinitization.

关键词： m.类型四个效果改变的花岗石 G。Abu Garadi 砍地区中央东方沙漠埃及