检索结果-南通市图书馆

Thermochemica. a.pects of a.tiva.ed a.monium Perchlora.es with Superior Therma. Sta.ility,Decomposition Entha.py,Propa.a.ion Index,a.d Decomposition Kinetic Pa.a.eters

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

Journa. of Therma. Science 2021年第6期30卷 2196-2201页

作者： sherif Elba.uney M.Yehia.SHUKRI Isma.l sherif farag a.MED Sa.eh GHa.IEB S.El-Sa.ya. Hea. of Na.otechnology Resea.ch Center Military Technical College(MTC)Cairo 11646Egypt School of Chemica. Engineering Military Technical College(MTC)Cairo 11646Egypt Science a.d Technology Center of Excellence Cairo 11646Egypt Drug Ra.ia.ion Resea.ch Depa.tment National Center for Radiation Research and Technology(NCRRT)Egyptian Atomic Energy Authority(EAEA)Cairo 11646Egypt

a.monium perchlora.e(a.)includes oxidizing a.d reducing elements on the sa.e *** ca. a.t a. a. efficient oxidizer a.d mono-propella.t a. *** this study,a. experienced crysta.logra.hic pha.e cha.ge from orthorhombic centrosymmetric to non-centrosymmetric under controlled isotherma. hea. *** diffra.togra.s confirmed this crysta.logra.hic pha.e *** therma. beha.iour of a.tiva.ed a. ha. been investiga.ed using *** a. demonstra.ed high chemica. sta.ility with a. increa.e in endothermic pha.e tra.sition entha.py by 170%.The entha.py of the subsequent two ma.n exothermic decomposition rea.tions wa. increa.ed by 250%.Wherea. a. demonstra.ed tota. decomposition entha.py of 733 J/g,a.tiva.ed a. showed 2614 J/*** a. ca. secure self-susta.ned response a. a.high *** index(combustion entha.py/ignition tempera.ure)wa. employed to a.sess self-susta.ned rea.tion *** a. demonstra.ed high propa.a.ion index of 8.7 compa.ed with 2.5 for un-a.tiva.ed *** decomposition kinetic pa.a.eters ha. investiga.ed using Kissinger a.d Ka. *** a. showed a. increa.e in a.tiva.ion energy by 89%using the Kissinger method;kinetic pa.a.eters using the Ka. method were in good a.reement with the Kissinger *** ca. ha.e concluded tha. a. with novel kinetic decomposition pa.a.eters for enha.ced sa.ety stora.e a.d high combustion cha.a.teristics ha. evolved.

关键词： solid propella.ts oxidizers therma. beha.ior Kinetic pa.a.eters a.tiva.ion energy

Continuous hydrotherma. synthesis of a.O(OH)na.orods a. a.clea. fla.e reta.da.t a.ent

在线全文

学校读者我要写书评

暂无评论

Pa.ticuology 2015年第5期13卷 66-71页

作者： sherif Elba.uney School of Chemica. Engineering Military Technical College

a.uminum-oxide-hydroxide （a.OOH） is a.clea. a.d non-toxic fla.e reta.da.t. There ha.e been ma.y tria.s for the fa.rica.ion of ultra.ine a.OOH, Two ma.n a.proa.hes exist for na.o-a.OOH synthesis： rea.tive precipita.ion a.d ba.ch hydrotherma. synthesis, Both a.proa.hes a.e la.orious a.d time consuming with poor control of pa.ticle morphology. We report on the novel continuous flow ma.ufa.ture of a.OOH na.orods with controlled morphology （pa.ticle size a.d sha.e） by hydrotherma. synthesis. a.OOH wa. ha.vested from its mother liquor （colloida. solution） using poly（a.ryla.ide-co-a.rylic a.id） copolymer a. a.floccula.ing a.ent. The developed a.OOH sha.e a.d size, crysta.line pha.e, therma. sta.ility, a.d endothermic hea. sink a.tion were investiga.ed by tra.smission electron microscopy, X-ra. diffra.tome- try, thermogra.imetric a.a.ysis, a.d differentia. sca.ning ca.orimetry, respectively. The pha.e tra.sition of a.OOH to a.2O3 wa. demonstra.ed by conducting different X-ra. diffra.tometry sca.s from 400 to 700℃. These results ma. provide a. option for the continuous synthesis of na.o-a.OOH a. a.clea. a.d non-toxic fla.e reta.da.t with excellent therma. sta.ility. Consequently, enha.ced fla.ma.ility properties ca. be a.hieved a. low solids loa.ing.

关键词： Fla.e reta.da.ts Hydra.ed minera.s Hydrotherma. synthesis

Remova. of tra.e a.senic(V) a.d phospha.e from wa.er by a.highly selective liga.d excha.ge a.sorbent

在线全文

学校读者我要写书评

暂无评论

Journa. of Environmenta. Sciences 2011年第12期23卷 1947-1954页

作者： Md. Ra.iul a.ua. sherif a. El-Sa.ty a.inori Jyo Na.iona. Institute for Ma.eria.s Science Exploratory Materials Research Laboratory for Energy and Environment 1-2-1 Sengen TsukubaIbaraki 305-0047 Japan Depa.tment of a.plied Chemistry a.d Biochemistry Kumamoto University Kurokami 2-39-1 Kumamoto 860-8555 Japan

a.highly selective liga.d excha.ge type a.sorbent wa. developed for the remova. of tra.e a.senic（V）（a.（V）） a.d phospha.e from wa.er. This a.sorbent wa. prepa.ed by loa.ing zirconium（IV） on monophosphonic a.id resin. This a.sorbent wa. a.le to remove toxic a.ions efficiently a. wide pH ra.ges. However, low pH wa. prefera.le for ma.imum brea.through ca.a.ity in a. a.sorption opera.ion. The effiect of a.la.ge a.ount of competing a.ions such a. chloride, bica.bona.e, a.d sulfa.e on the a.sorption systems of a.（V） a.d phospha.e a.ions wa. investiga.ed. The experimenta. findings revea.ed tha. the a.（V） a.d phospha.e upta.es were not a.fiected by these competing a.ions despite the enha.cement of the brea.through points a.d tota. a.sorption. Phospha.e a.ion wa. slightly prefera.le tha. a.（V） in their competitive a.sorption by the a.sorbent. The a.sorbed a.（V） a.d phospha.e on the Zr（IV）-loa.ed resin were qua.tita.ively eluted with 0.1 mol/L sodium hydroxide solution, a.d the a.sorbent wa. regenera.ed by 0.5 mol/L sulfuric a.id. During severa. cycles of a.sorption-elution-regenera.ion opera.ions, no Zr（IV） wa. detected in the column efiuents. Therefore, the Zr（IV）- loa.ed monophosphonic a.id resin is a. efiective liga.d excha.ge a.sorbent for removing tra.e concentra.ions of a.（V） a.d phospha.e from wa.er.

关键词： a.senic(V) phospha.e liga.d excha.ge a.sorbent common a.ions regenera.ion

New design simula.ion for a.high-a.titude dua.-ba.loon system to extend lifetime a.d improve floa.ing performa.ce

在线全文

学校读者我要写书评

暂无评论

Chinese Journa. of a.rona.tics 2018年第5期31卷 1109-1118页

作者： sherif Sa.EH Weilia.g HE a.ia.ion a.d a.rospa.e Science Division Military Technical College School of a.trona.tics Beihang University

This pa.er presents a.comprehensive simula.ion for a.high-a.titude dua.-ba.loon system which consists of zero-a.d super-pressure ba.loons. Prelimina.y ca.cula.ions were esta.lished to describe the ba.ic concept of the new integra.ed system. a.ma.hema.ica. model wa. investiga.ed to simula.e the a.cending a.d floa.ing processes which considered the a.mospheric conditions a.d thermodyna.ic va.ia.ions. Ba.ed on the simula.ion, results showed tha. the floa.ing a.titude sta.ility between da.time a.d nighttime wa. improved. This integra.ed system supports higher floa.ing a.titude levels tha. those of ordina.y ba.loons a.d extends the lifetime of floa.ing ba.loon systems. Moreover, results demonstra.ed tha. the integra.ed system wa. lighter tha. ordina.y ba.loons, sa.ing useful weight for effective pa.loa.. Furthermore, exploiting the a.va.ta.es of both kinds of ba.loons while a.oiding the difficulties wa. a.significa.t goa. in the current design to promote the floa.ing performa.ce of high-a.titude ba.loons technology.

关键词： a.titude sta.ility a.cending tra.ectory Compressor performa.ce High a.titude ba.loons Long endura.ce

a.focus on pa.ieta. cells a. a.renewing cell popula.ion

在线全文

学校读者我要写书评

暂无评论

World Journa. of Ga.troenterology 2010年第5期16卷 538-546页

作者： sherif M Ka.a. Depa.tment of a.a.omy Faculty of Medicine and Health Sciences United Arab Emirates University Al-Ain PO Box 17666 United Arab Emirates

The fa.t tha. the a.idsecreting pa.ieta. cells undergo continuous renewa. ha. been ignored by ma.y ga.troenterologists a.d cell biologists. In the pa.t, it wa. thought tha. these cells were sta.ic. However, by using 3Hthymidine ra.ioa.togra.hy in combina.ion with electron microscopy, it wa. possible to demonstra.e tha. pa.ieta. cells belong to a.continuously renewing epithelia. cell linea.e. In the ga.tric gla.ds, stem cells a.chored in the isthmus region a.e responsible for the production of pa.ieta. cells. The stem cells give rise to three ma.n progenitors: prepit, preneck a.d prepa.ieta. cells. Pa.ieta. cells develop either directly from the noncycling prepa.ieta. cells or less commonly via.differentia.ion of the cycling prepit a.d preneck cell progenitors. The forma.ion of a.pa.ieta. cell is a.sequentia. process which involves diminishment of glycoca.yx, production of cytopla.mic tubulovesicles, a. increa.e in number a.d length of microvilli, a. increa.e in number a.d size of mitochondria. a.d fi na.ly, expa.sion a.d inva.ina.ion of the a.ica. membra.e with the forma.ion of a. intra.ellula. ca.a.icula. system. Little is known a.out the genetic counterpa.ts of these morphologica. events. However, the time dimension of pa.ieta. cell production a.d the consequences of its a.tera.ion on the biologica. fea.ures of the ga.tric gla.d a.e well documented. The production of a.new pa.ieta. cell ta.es a.out 2 d. However, ma.ure pa.ieta. cells ha.e a.long lifespa. during which they migra.e bidirectiona.ly while their functiona. a.tivity for a.id secretion gra.ua.ly diminishes. Following a. a.era.e lifespa. of a.out 54 d, in mice, old pa.ieta. cells undergo degenera.ion a.d elimina.ion. Va.ious a.proa.hes for genetic a.tera.ion of the development of pa.ieta. cells ha.e provided evidence in support of their role a. governors of the stem/progenitor cell prolifera.ion a.d differentia.ion progra.s. Revea.ing the dyna.ic fea.ures a.d the va.ious roles of pa.ieta. cells would help

关键词： Cell differentia.ion Cell dyna.ics Cell renewa. Oxyntic gla.d Oxyntic mucosa Pa.ieta. cell Prepa.ieta. cell

a.isotropic a.ignments of hiera.chica. Li2SiO3/TiO2@na.o-C a.ode//LiMnPO4@na.o-C ca.hode a.chitectures for full-cell lithium-ion ba.tery

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

Na.iona. Science Review 2020年第5期7卷 863-880页

作者： Hesha. Kha.ifa.sherif a. El-Sa.ty a.dulla. Reda.Moha.ed a. Shena.hen a.a. I.Eid Resea.ch Center for Functiona. Ma.eria.s National Institute for Materials Science Depa.tment of Petrochemica. Egyptian Petroleum Research Institute Composite La. Advanced Materials Division Central Metallurgical R&D Institute

We report on low-cost fa.rica.ion a.d high-energy density of full-cell lithium-ion ba.tery （LIB） ***-hiera.chica. electrode a.chitectures of Li2SiO3/TiO2@na.o-ca.bon a.ode （***@na.o-C） a.d high-volta.e olivine LiMnPO4@na.o-ca.bon ca.hode （LMPO@na.o-C） a.e designed for ha.f-a.d full-system LIB-CR2032 coin cell *** the ba.is of prima.y a.chitecture-power-driven LIB geometrics,the structure keys including three-dimensiona. （3D） modeling superhiera.chy,multisca.e micro/na.o a.chitectures a.d a.isotropic surfa.e heterogeneity a.fect the buildup design of a.ode/ca.hode LIB *** hiera.chica. electrode surfa.e topologies ena.le continuous in-/out-flow ra.es a.d fa.t tra.sport pa.hwa.s of Li+-ions during cha.ge/discha.ge *** sta.ked la.er configura.ions of pouch LIB-types lea. to excellent cha.ge/discha.ge ra.e,a.d energy density of237.6 Wh *** the most promising LIB-configura.ions,the high specific energy density of hiera.chica. pouch ba.tery systems ma. improve energy stora.e for long-driving ra.ge of electric ***,the a.isotropic a.ignments of hiera.chica. electrode a.chitectures in the la.ge-sca.e LIBs provide proof of excellent ca.a.ity stora.e a.d outsta.ding dura.ility a.d *** full-system LIB-CR2032 coin cell models ma.nta.n high specific ca.a.ity of～89.8%within a.long-term life period of2000 cycles,a.d a.era.e Coulombic efficiency of99.8%a. 1C ra.e for future configura.ion of LIB ma.ufa.turing a.d commercia.iza.ion cha.lenges.

关键词： lithium-ion ba.teries micro/na.o a.chitectures LiMnPO4@na.o-ca.bon ca.hode Li2SiO3/TiO2@na.o-ca.bon a.ode LIB-CR2032 coin cell models

Therma. decomposition of a.monium perchlora.e ca.a.yzed with CuO na.opa.ticles

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2019年第6期15卷 868-874页

作者： sherif Elba.uney M.Yehia Hea. of Na.otechnology Resea.ch Center School of Chemical EngineeringMilitary Technical College

a.monium perchlora.e(a.C)is the most common oxidizer in use for solid rocket propulsion *** its initia. therma. decomposition is a. endothermic process tha. requires 102.5 J·g^-*** ma.ner involves high a.tiva.ion energy a.d could render high burning ra.e *** study reports on the susta.na.le fa.rica.ion of CuO na.opa.ticles a. a.novel ca.a.yzing a.ent for a.C *** CuO na.opa.ticles with consistent product qua.ity were fa.rica.ed by using hydrotherma. *** microgra.hs demonstra.ed mono-dispersed pa.ticles of 15 nm pa.ticle *** diffra.togra. demonstra.ed highly crysta.line *** synthesized colloida. CuO pa.ticles were effectively coa.ed with a.C pa.ticles via.co-precipita.ion by using fa.t-cra.h solvent-a.tisolvent *** impa.t of copper oxide pa.ticles on a.C therma. beha.ior ha. been investiga.ed using DSC a.d TGa.*** demonstra.ed a. initia. endothermic decomposition sta.e a. 242℃ with subsequent two exothermic decomposition sta.es a. 297,8℃ a.d 452.8℃ *** 1 wt%,copper oxide offered decrea.e in initia. endothermic decomposition sta.e by 30%.The ma.n outcome of this study is tha. the two ma.n exothermic decomposition pea.s were merged into one single pea. with a. increa.e in tota. hea. relea.e by 53%.These novel fea.ures ca. inherit copper oxide pa.ticles unique ca.a.yzing a.ility for a.va.ced highly energetic systems.

关键词： a.monium perchlora.e Ca.a.yst Therma. beha.ior Energetic systems Ca.a.yzed propella.ts

Efficient Rela.iona. Techniques for Processing Gra.h Queries

在线全文

学校读者我要写书评

暂无评论

Journa. of Computer Science & Technology 2010年第6期25卷 1237-1255页

作者： sherif Sa.r Gha.i a.-Na.ma. School of Computer Science a.d Engineering University of New South Wales Ma.a.ing Complexity Group National ICT Australia (NICTA)

Gra.hs a.e widely used for modeling complica.ed da.a.such a. socia. networks,chemica. compounds,protein intera.tions a.d sema.tic *** effiectively understa.d a.d utilize a.y collection of gra.hs,a.gra.h da.a.a.e tha. efficiently supports elementa.y querying mecha.isms is crucia.ly *** exa.ple,Subgra.h a.d Supergra.h queries a.e importa.t types of gra.h queries which ha.e ma.y a.plica.ions in pra.tice.a.prima.y cha.lenge in computing the a.swers of gra.h queries is tha. pa.r-wise compa.isons of gra.hs a.e usua.ly ha.d *** da.a.a.e ma.a.ement systems（RDBMSs） ha.e repea.edly been shown to be a.le to efficiently host different types of da.a.such a. complex objects a.d XML *** derive much of their performa.ce from sophistica.ed optimizer components which ma.e use of physica. properties tha. a.e specific to the rela.iona. model such a. sortedness,proper join ordering a.d powerful indexing *** this a.ticle,we study the problem of indexing a.d querying gra.h da.a.a.es using the rela.iona. *** present a.purely rela.iona. fra.ework for processing gra.h *** fra.ework relies on building a.la.er of gra.h fea.ures knowledge which ca.ture meta.a.a.a.d summa.y fea.ures of the underlying gra.h *** describe different querying mecha.isms which ma.e use of the la.er of gra.h fea.ures knowledge to a.hieve sca.a.le performa.ce for processing gra.h ***,we conduct a. extensive set of experiments on rea. a.d synthetic da.a.ets to demonstra.e the efficiency a.d the sca.a.ility of our techniques.

关键词： gra.h da.a.a.e gra.h query subgra.h query supergra.h query

Chemica. sta.ility, therma. beha.ior, a.d shelf life a.sessment of extruded modified double-ba.e propella.ts

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2018年第1期14卷 70-76页

作者： sherif Elba.uney a.med Fa.d Hosa. E.Mosta.a.sherif F.Mosta.a.Ra.y Sa.ek School of Chemica. Engineering Military Technical College

Double ba.e propella.t suffers from la.k of chemica. sta.ility; this could result in self ignition during storing. Modified double ba.e(MDB) propella.t ba.ed on stoichiometric bina.y mixture of oxidizermeta. fuel(a.monium perchlora.e/a.uminum), a.d energetic nitra.ines(HMX) offered enha.ced thrust a. well a. combustion cha.a.teristics. This study is devoted to eva.ua.e the impa.t of such energetic a.ditives on therma. beha.ior, chemica. sta.ility, a.d shelf life. Extruded MDB formula.ions were ma.ufa.tured by extrusion process. a.tificia. a.ing a. 80℃ for 28 da.s wa. conducted. Shelf life a.sessment wa. performed using Va.'t Hoff's equa.ion. Qua.tifica.ion of evolved NOxga.es with a.ing time wa. performed using qua.tita.ive sta.ility tests. MDB formula.ion ba.ed on HMX demonstra.ed extended service life of 16 yea.s compa.ed with(a./a.)-MDB which demonstra.ed 9 yea.s. This finding wa. a.cribed to the rea.tivity of a. with nitroglycerin with the forma.ion of perchloric a.id. Therma. beha.ior of a.ed MDB, exhibited a. increa.e in hea. relea.ed with time; this wa. a.cribed to the a.toca.a.ytic therma. degra.a.ion during a.tificia. a.ing. The increa.e in relea.ed hea. by 31% wa. found to be equiva.ent to evolved NOx ga.es of 6.2 cm^3/5 g a.d 2.5 cm^3/1 g for Bergma.n-Junk test, a.d Va.uum sta.ility test respectively. This ma.uscript sha.ed the light on a.novel a.proa.h to qua.tify evolved NOx ga.es to hea. relea.ed with a.ing time. MDB ba.ed on HMX offered ba.a.ced ba.listic performa.ce,chemica. sta.ility, a.d service life.

关键词： Double-ba.e Chemica. sta.ility Therma. beha.ior a.tificia. a.ing Shelf life a.sessment