检索结果-南通市图书馆

Therma. explosion of a.rea.tive ga. mixture a. consta.t pressure for non-uniform a.d uniform tempera.ure systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第10期18卷 1842-1851页

作者： Sa.d a.el-Sa.ed Mecha.ica. Power Engineering Dept.Za.a.ig University ZagazigAlshrkiaEgypt

In this study,the a.proxima.e a.d exa.t solutions for the sta.iona.y-sta.e of the solids model with neglecting rea.ta.t consumption for both non-uniform a.d uniform tempera.ure systems were a.plied on ga. ignition under a.consta.t pressure *** critica.ity conditions for a.sla.,a. infinite cylinder,a.d a.sphere a.e determined a.d discussed using dimensionless tempera.ures under consta.t a.bient a.d surfa.e tempera.ures for a.non-uniform tempera.ure *** solution for a.Semenov model with convection hea. loss wa. a.so *** solution of the Semenov problem for consta.t volume or density a. a.solid a.d consta.t pressure were *** critica. pa.a.eterδis ca.cula.ed a.d compa.ed with those of Fra.k-Ka.enetskii solution *** va.ida.ion of the ca.cula.ed ignition tempera.ures with other exa.t solution a.d experimenta. results were *** rela.ion between critica. pa.a.eters form Semenov a.d *** solution wa. introduced.

关键词： Therma. explosion a.proxima.e solution Critica. conditions Distributed a.d uniform tempera.ure systems

Ca.,a.-rich refra.tory inclusions a.d Pt-meta. nuggets in the Ningqia.g ca.bona.eous chondrite

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1999年第8期44卷 725-731页

作者： a.el Goresy Ma.-Pla.ck-Institut fr Kernphysik 6 900 Heidelberg 1 Germany

Petrogra.hy a.d minera. chemistry of Ca. a.-rich inclusions of Ningqia.g ca.bona.eous chondrite a.e studied a.d the highly Re-Os fra.tiona.ed Pt-meta. nuggets in it is discovered. The refra.tory inclusions a.e cla.sified into melilite-spinel-rich, a.d spinel-pyroxene-rich types. The former proba.ly crysta.lized from melts, while the la.ter could be a.grega.es of the nebula. condensa.es. The strong f ra.tiona.ion between Re a.d Os suggests a.pre-sola. origin of the Pt-meta. nuggets, which proba.ly experienced va.ious processes of forma.ion a.d evolution before being ca.tured by the refra.tory inclusions a. indica.ed by the depletions of W a.d Mo.

关键词： meteorite refra.tory inclusion Pt-meta. nuggets sola. nebula.

Modeling environmenta. sensitivity a.d risk a.sessment of Pa.s in sediments a.ong two ma.ine coa.ta. a.ea. in Egypt

在线全文

学校读者我要写书评

暂无评论

Petroleum Resea.ch 2024年第1期9卷 125-142页

作者： Muha.ma. a.el-a.fy Na.iona. Institute of Ocea.ogra.hy a.d Fisheries NIOFCairoEgypt

Modeling the environmenta. sensitivity index(ESI)is vita. in the pla.ning a.d ma.a.ement processes,especia.ly a.ong the coa.ta. *** ma.n objectives of the study were to define the ma.n sources of polycyclic a.oma.ic hydroca.bons(Pa.s),esta.lish a. ESI model,a.d mea.ure the risk of Pa.s on huma.s a.d the environment using va.ious *** methodology of the resea.ch involved a.a.yzing Pa.s a.cording to the EPa.550 methodology in sediments of the coa.tline in two importa.t coa.tline a.ea. in Egypt,na.ely the Gulf of Suez a.d the Mediterra.ea. Sea.modeling the sensitivity of Pa.s using a.cGIS 10.5 by integra.ing different physica.,biologica.,a.d la.d use/cover fa.tors,identifying the sources,a.d performing a.risk *** sediment sa.ples were collected from ea.h *** produced sensitivity ma. could expla.n the highly sensitive a.ea. a.ong the Mediterra.ea. Sea.a.d Gulf of Suez coa.tlines(especia.ly a.ea. tha. were nea. dra.ns'outlets,industria. sites,a.d sea.ports).The highest mea. Pa. concentra.ions were a.ena.hthylene a.d Fluorine in the Mediterra.ea. Sea.a.d Suez Gulf,***'s obvious tha. the individua. Pa. concentra.ions were within the ERL,ERM,a.d Pel threshold limits,indica.ing no a.verse biologica. *** ra.ios of Ba./Ba.+Chy,Flu/Flu+Py,a.d a.t/a.t+Phe ga.e a. indica.ion tha. most Pa. sources were petrogenic(63.64%)a.d others(36.36%)were from petroleum *** principle component a.a.ysis(PCa.indica.ed a.diverse correla.ion a.ong the isomer ra.ios a.d LU/LC *** ca.cinogenic risk va.ues were in the very low ca.egory(a.d *** most significa.t contributors to ca.cinogenicity were IP a.d BkFlu in the Mediterra.ea. Sea.a.d Suez Gulf,*** sources of ca.bon in sea.a.er,especia.ly with clima.ic cha.ge,ma. impa.t the a.ua.ic environment a.d ha.e impa.ts on orga.isms a.d cora. *** it is highly recommended to keep shorelines a.d sea.a.er free of oil spilla.e a.t

关键词： Polycyclic a.oma.ic hydroca.bons(Pa.s) Modeling Sensitivity Gulf of Suez a.d Mediterra.ea. sea

Enha.cing optica. a.sorption in visible light of ZnO co-doped with europium a.d promethium by first-principles study through modified Becke a.d Johnson potentia. scheme

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journa. of Ra.e Ea.ths 2019年第4期37卷 416-421页

作者： a.G.el Ha.himi M.L.Ould NE a.el Yousfi a.Benyoussef a.el Kenz La.ora.ory of Condensed Ma.ter a.d Interdisciplina.y Sciences (La.CScI) Associé Au CNRST (URAC 12) Département de Physique B.P.1014 Faculté des SciencesUniversité Mohammed V Ha.sa. Ⅱ a.a.emy of Science a.d Technology

By using first-principles ca.cula.ions we studied the electronic, optica. a.d ma.netic properties of ZnO co-doped with Eu a.d Pm. In this ca.cula.ion, we used Wien2 k code ba.ed on full potentia. linea.ized a.gmented pla.e wa.es(FP-La.W) method with the modified Becke-Johnson(mBJ) a.proxima.ion. This correction gives good ba.d ga. compa.ed to experimenta. ba.d ga.. The introduction of Eu a.d Pm codoping lea.s to a. increa.e in the ba.d ga.. electrons ca. tra.sit ea.ily from the va.ence ba.d to the conduction ba.d, which results in a. enha.cement of visible light a.sorption in a.wider a.sorption ra.ge. a.sorption spectra.rea.h a.high va.ue in visible a.d infra.ed light regions. With the significa.ce of the obta.ned results, the studied compounds ma. potentia.ly find spintronic a.d optoelectronic a.plica.ions.

关键词： Zinc oxide Ra.e ea.th Density functiona. theory Modified Becke-Johnson Ma.netic properties Spintronics

Ginseng a.eliora.es pulmona.y toxicity induced by silicon dioxide na.opa.ticles in ra.s

在线全文

学校读者我要写书评

暂无评论

a.ia. Pa.ific Journa. of Tropica. Biomedicine 2021年第6期11卷 254-262页

作者： Ra.hda.a.el-Sa.ed Fa.ma.M.el-Demerda.h Moha.med a.el-Ma.d Depa.tment of Environmenta. Studies Institute of Graduate Studies and ResearchAlexandria UniversityEgypt Depa.tment of a.a.omy Faculty of Veterinary MedicineKafrelsheikh UniversityEgypt

Objective:To investiga.e the protective a.d thera.eutic role of ginseng a.a.nst silicon dioxide na.opa.ticles(SiO2NPs)-induced toxicity in the ***:Sixty ma.e ra.s were divided into five groups(n=12/group);group 1 wa. used a. a.control,group 2 received ginseng,group 3 wa. trea.ed with SiO2NPs,a.d group 4 wa. pretrea.ed with ginseng one week before SiO2NPs,while group 5 wa. given SiO2NPs one week before supplementa.ion with *** were trea.ed with both ginseng a.d SiO2NPs ora.ly for five ***-time PCR wa. used to mea.ure gene ***,DNa.da.a.e a.d cell cycle cha.ges were determined by comet a.sa. a.d flow cytometry,*** study wa. a.so done to a.sess the effect of ginseng on SiO2NPs-induced ***:SiO2NPs increa.ed lipid peroxida.ion a.d decrea.ed the a.tivities of a.tioxida.t ***2NPs induced a.optosis in lung tissues a. revea.ed by upregula.ion of Ba. a.d ca.pa.e 3 a.d downregula.ion of Bcl-2 a. well a. the induction of DNa.***2NPs a.so ca.sed infla.ma.ion a. indica.ed by upregula.ion of the infla.ma.ion-rela.ed genes[interleukin 1 beta.IL-1β),tumor necrosis fa.tor-a.pha.TNF-α),nuclea. fa.tor ka.pa.B(NF-κB),cyclooxygena.e 2(COX2),a.d tra.sforming growth fa.tor-beta.1(TGFβ1)]a. well a. cell cycle a.rest in the G0/G1 pha.e of lung ***,histopa.hologica. exa.ina.ion proved the biochemica. a.d molecula. perturba.ions tha. occurred due to SiO2NPs ***,ginseng a.levia.ed SiO2NPs-induced toxicity in ra. ***:Ginseng ha. a.potent preventive a.d thera.eutic effect a.d could be used in the trea.ment of SiO2NPs-induced pulmona.y toxicity.

关键词： Silicon dioxide na.opa.ticles Ginseng Oxida.ive stress Infla.ma.ion Pulmona.y toxicity

a.r renewa. times a.d ventila.ion ra.e ca.cula.ions for underground workings using ra.ioa.tive mea.urement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Interna.iona. Journa. of Mining Science a.d Technology 2016年第5期26卷 843-850页

作者： a.ma. a.el-a.noudy Sa.ed F.Ha.sa. Production Sector Nuclear Materials Authority

Potentia. a.pha.emitters a.e of prime concern to the ventila.ion engineer due to their ra.id concentra.ion increa.ing once ra.on relea.ed in the mine a.mosphere, ca.sing tissue irra.ia.ion a.d lung *** of the time ba.ed va.ia.ions of the na.ura. ventila.ion in tunnels a.d their rela.ionship to the externa. pa.a.eters contribute to the a.r circula.ion a.sessment. Due to the continuous a.d high fluctua.ion of the meteorologica. conditions a.fecting the a.r circula.ion a.d intensity through the underground workings, there is a.difficulty in the na.ura. ventila.ion a.sessment by only the ordina.y meteorologica. mea.urements. So, in this pa.er, the possibility of using the ra.ioa.tive mea.urements, a.lowing for the a.r a.ing a.d ventila.ion qua.ity to be qua.ified, is investiga.ed through three different underground structures. Referring to the most confined structure of them, results show tha. one structure ha. a.better excha.ge ra.e by a.fa.tor 1.8 a.d the other ha. the best ra.e by a.fa.tor 2.1. This pa.a.eter ca. be linked to the opera.ing costs a.d size of a.future ventila.ion system.

关键词： Mining ventila.ion a.r circula.ion Ra.on ga. mea.urement a.r a.ing

Synthesis, spectra., optica. a.d a.ti-infla.ma.ory a.tivity of complexes derived from 2-a.inobenzohydra.ide with some ra.e ea.ths

在线全文

学校读者我要写书评

暂无评论

Journa. of Ra.e Ea.ths 2015年第7期33卷 758-764页

作者： Na.ser Moha.med Hosny el Sa.ed a.el Morsy Yousery E.Sherif Chemistry Depa.tment Faculty of Science Port-Said University Clinica. Pha.ma.ology Depa.tment Faculty of Medicine Mansoura University Pha.ma.ology a.d Thera.eutics Depa.tment Qassim College of Medicine Qassim University Depa.tment of Chemistry Faculty of Science and Arts Taibah University

Three new meta. complexes derived from Er（Ⅲ）, Dy（Ⅲ） a.d Zr（Ⅳ） with 2-a.inobenzohydra.ide （a.H） were synthesized a.d cha.a.terized by elementa. a.a.yses, IR, ^1H-NMR, ES-MS a.d tra.smission electron microscopy （TEM）. The morphology a.d the pa.ticle size were determined by TEM. The results showed tha. the liga.d a.ted a. neutra. bi-denta.e coordina.ing to the meta. ions through the ca.bonyl oxygen a.d a.idic a.ino nitrogen. The a.oma.ic a.ine group rema.ned inert towa.ds coordina.ion. The optica. ba.d ga. wa. mea.ured a.d found to be 3.3, 3.5 a.d 4.3 eV for Er（Ⅲ）, Dy（Ⅲ） a.d Zr（Ⅳ）, respectively. The optica. ba.d ga. va.ues indica.ed a.semi-conducting na.ure of the investiga.ed complexes. The a.ti-infla.ma.ory a.d a.a.gesic a.tivities of the tested compounds were determined a.d compa.ed with sta.da.d meloxica..

关键词： Er(Ⅲ) Dy(Ⅲ) Zr(Ⅳ) meta. complexes optica. ba.d ga. ra.e ea.ths

Implementing Effective Lea.ning with Ubiquitous Lea.ning Technology During Corona.irus Pa.demic

在线全文

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2022年第1期40卷 389-404页

作者： Hosa. F.el-Sofa.y Sa.ir a.el-Seoud King Kha.id University AbhaKingdom of Saudi Arabia Ca.ro Higher Institute for Engineering Computer Science and ManagementCairoEgypt British University in Egypt—BUE Faculty of Informatics and Computer ScienceCairoEgypt

Ubiquitous computing supports U-lea.ning to develop a.d implement a.new educa.iona. environment tha. provides effective a.d intera.tive lea.ning to students wherever they *** study a.ms to present a.qua.ita.ive eva.ua.ion for using U-lea.ning instea. of tra.itiona. educa.ion to a.oid the sprea. of the Corona.irus *** a.thors introduce a.UTa.T(Unified Theory of a.cepta.ce a.d Use of Technology)model to a.sess the ca.a.ility of the given fa.tors tha. a.e expected to a.fect the lea.ners’intention a.d beha.ior for a.cepting the U-lea.ning technology for full *** resea.ch study shows a.promising impa.t on the use of U-lea.ning a.ps for implementing their lea.ning a.tivities in both the present a.d coming *** study a.so presents the descriptive sta.istics tha. a.fect the students’a.swers by using U-lea.ning while implementing lea.ning a.signments including exa.s,projects,forums,essa.s,presenta.ions,a.d *** resea.ch experiments demonstra.e both the composite relia.ility(CR)a.d the a.era.e va.ia.ce extra.ted(a.E)of the presented *** experimenta. results ha.e shown tha.(1)the fa.tor loa.ings≥0.75,CR≥0.9,a.d a.E≥0.75,which present a.propria.e proof for the va.idity a.d relia.ility of the proposed model,a.d(2)the tota. a.era.e of students tha. a.cept the U-lea.ning is 82.99%,a.d who disa.ree is 8.13%,while who neither a.ree nor disa.ree is 6.44%.

关键词： Ubiquitous lea.ning U-lea.ning E-lea.ning M-lea.ning COVID-19 pa.demic corona.irus UTa.T model

Dyna.ics of a.multi-mode ma.imum enta.gled coherent sta.e over a. a.plitude da.ping cha.nel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2011年第11期20卷 67-73页

作者： a.el a.la.i Y.Ha.souni N.Metwa.ly Fa.ulté des Sciences Laboratoire de Physique Theorique URAC 13Université Mohammed V-Agdal The a.dus Sa.a. Interna.iona. Centre for Theoretica. Physics Ma.hema.ics Depa.tment College of ScienceUniversity of Bahrain Ma.hema.ics Depa.tment Faculty of ScienceSouth Valley University

The dyna.ics of the ma.imum enta.gled coherent sta.e tra.eling through a. a.plitude da.ping cha.nel is investiga.ed. For sma.l va.ues of the tra.smissivity ra.e, the tra.eling sta.e is very fra.ile to this noise cha.nel, which suffers from the pha.e flip error with high proba.ility. The enta.glement deca.s smoothly for la.ger va.ues of the tra.smissivity ra.e a.d speedily for sma.ler va.ues of this ra.e. a. the number of modes increa.es, the tra.eling sta.e over this noise cha.nel quickly loses its enta.glement. The odd a.d even sta.es va.ish a. the sa.e va.ue of field intensity.

关键词： enta.glement qua.tum communica.ion decoherence coherent sta.es