检索结果-南通市图书馆

Influence of Na.ocrysta.line ZrO<sub>2</sub>a.ditives on the Fra.ture Toughness a.d Ha.dness of Spa.k Pla.m. a.tiva.ed Sintered WC/ZrO<sub>2</sub>Na.ocom.osites Obta.ned by m.cha.ica. m.xing m.thod

引用

Open Journa. of Com.osite m.teria.s 2012年第1期2卷 1-7页

作者： m. Sherif El-Eska.da.a.y hesham m. a. soliman m. Om.ric 不详

The present study reports the form.tion of ultra.ine ha.d pa.ticles of na.ocom.osite WC with different a.ditions of ZrO2 powders (0.5 - 20 vol.%). The initia. m.xed powders of WC with the desired ZrO2 concentra.ions were m.cha.ica.ly m.xed for 360 ks (end-product) under a.gon ga. a.m.sphere a. room.tem.era.ure, using high energy ba.l m.ll. The end-product consists of a.era.e gra.n size of a.out 17 nm.in dia.0}ter. The obta.ned na.ocom.osite powders were consolida.ed into fully dense com.a.t, using spa.k pla.m. sintering (SPS) technique in va.uum. The experim.nta. results revea.ed tha. the consolida.ion step, which wa. conducted a. 1673 K with unia.ia. pressure ra.ging from.19.6 to 38.2 m.a.for short tim. (0.18 ks), does not lea. to dra.0}tic gra.n growth in the powders so tha. the consolida.ed na.ocom.osite bulk objects m.inta.n their na.ocrysta.line beha.ior, being fine gra.ns with a. a.era.e size of 63 nm.in dia.0}ter. The rela.ive densities of consolida.ed na.ocom.osite WC/ZrO2 m.teria.s increa.e from.99.1% for WC-0.5% ZrO2 to 99.93% for WC-20% ZrO2. The indenta.ion fra.ture toughness of the com.osites ca. be ta.lored between 7.31 a.d 19.46 m.a.m./2 by controlling the volum. fra.tion of ZrO2 m.trix from.0.5% to 20%. The results show tha. the Poisson’s ra.io increa.ed m.notonica.ly with increa.ing the ZrO2 concentra.ions to get a.m.xim.m.va.ue of 0.268 for WC-20% ZrO2. In the whole ra.ge of ZrO2 concentra.ions (0.5 - 20 vol.%), high ha.dness va.ues (20.73 to 22.83 GPa. were a.hieved. The Young’s m.dulus tends to decrea.e with increa.ing the volum. fra.tion of the ZrO2 m.trix to rea.h a.m.nim.m.va.ue of 583.2 GPa.for WC-20% ZrO2. These ha.d a.d tough WC/ZrO2 na.ocom.osites a.e proposed to be em.loyed a. higher a.ra.ive-wea. resista.t m.teria.s.

关键词： Na.ocom.osite Tungsten Ca.bide Zirconia Spa.k Pla.m. Sintering Powder m.ta.lurgy m.cha.ica. a.loying m.crostructure SEm HRTEm

来源：

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

Electrochem.ca. Deposition a.d Optim.za.ion of Therm.electric Na.ostructured Bism.th Telluride Thick Film.

引用

Engineering（科研） 2011年第6期3卷 659-667页

作者： hesham m. a. soliman a.del-Ha.y B. Ka.hyout 不详

Bism.th telluride thick film. a.e suita.le for therm.electric (TE) devices covering la.ge a.ea. a.d opera.ing a. sm.ll-to-m.dera.e tem.era.ure differences (20 - 200 K). High efficiency a.d high coefficient of perform.nce (COP) a.e expected to be a.hieved by using thick film. in som. cooling a.plica.ions. Bism.th telluride thick film. fa.rica.ion ha.e been a.hieved with Ga.va.osta.ic a.d Potentionsta.ic deposition. Stoichiom.tric bism.th telluride thick film.wa. obta.ned by Ga.va.osta.ic deposition a. current density of 3.1 m.cm.2. Bism.th telluride film. with a.era.e growth ra.e of 10 μm.-1 a.d different com.osition were obta.ned. Effects of current density a.d com.osition of electrolyte in Ga.va.osta.ic deposition were studied. The current density a.fected the film.com.a.tness, where film. deposited a. lower current density were m.re com.a.t tha. those deposited a. higher current density. The m.rphology of the film. did not depend on the current density, but chem.ca. com.osition wa. observed when different com.osition of electrolyte wa. used. Effects of dista.ce between electrodes, com.osition of electrolyte solution, a.d stirring in Potentionsta.ic deposition were studied. The shorter the dista.ce between electrodes, the higher the electric field, thus the higher current density wa. a.plied a.d the deposited film.wa. less com.a.t. The current density increa.ed m.re ra.idly with stirring during electrodeposition which lea.s to less com.a.t film. Through this study, film. electrode-posited from.solution conta.ning 0.013 m.Bi(NO3)3.5 H2O, 0.01 m.TeO2 a.d 1 m.HNO3 a. 3.1 m. cm.2 for 6 hours without stirring a.d with interelectrode dista.ce of 4.5 cm.were free-sta.ding with a.era.e film.thickness of 60 μm.a.d optim.m.film.com.osition of Bi2Te3. The crysta.lite size of the la.er film. wa. found to be a.ound 4.3 nm.using Scherrer’s equa.ion from.XRD pa.terns. a.so, nega.ive Seebeck coefficient for the sa.0} sa.0}les wa. revea.ed with a. a.era.e va.ue of -82 μV.K-1.

关键词： Bism.th Telluride Therm.electric Electrodeposition Na.ostructure Thick Film

来源：

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

Fa.rica.ion of Congo Red/Oxidized Porous Silicon (CR/OPS) pH-Sensors

引用

m.teria.s Sciences a.d a.plica.ions 2013年第8期4卷 79-87页

作者： a.del-Ha.y Ka.hyout hesham m. a. soliman m.rwa.Na.il a.m.d a. Bisha.a a.va.ced Technology a.d New m.teria.s Resea.ch Institute City for Scientific Research and Technology Applications New Borg El-Arab City Alexandria Egypt Physics Depa.tm.nt Faculty of Science Alexandria University Alexandria Egypt

The fa.rica.ion of na.o porous silicon, nPSi, using a.ka.i etching process ha. been studied a.d ca.ried out. The surfa.e chem.stry of a.isotropic etching of n-type Si-wa.er is reviewed a.d the a.isotropic chem.ca. etching of silicon in a.ka.ine solution using wetting a.ents is discussed. Tra.sform.tion of crysta.logra.hic pla.e of n-Si (211) to nPSi (100) ha. occurred on using n-propa.ol a. wetting a.ent. The ra.e of pore form.tion wa. 0.02478 - 0.02827 μm.m.n, which wa. hea.ily dependent upon the concentra.ion of the etcha.t conta.ning wetting a.ents, a.lowing pa.terned porous silicon form.tion through selective doping of the substra.e. a.pa.ticle size of 15 nm.for porous na.o-silicon wa. ca.cula.ed from.the XRD da.a. Porosity of PS la.ers is a.out 10%. Pore dia.0}ter a.d porous la.er thickness a.e 0.0614 nm.a.d 16 μm. respectively. The energy ga. of the produced porous silicon is 3.3 eV. Furtherm.re, the com.ina.ion of PS with Congo Red, which a.e na.ostructured due to their deposition within the porous m.trix is discussed. Such na.o com.ounds offer broa. a.enue of new a.d interesting properties depending on the involved m.teria.s a. well a. on their m.rphology. Chem.ca. route wa. utilized a. the host m.teria. to a.hieve pores filling. They were im.regna.ed with Congo Red, which ga.e good results for the porous silicon a. a.prom.sing pH sensor.

关键词： Na.o Porous Silicon a.isotropic Etching Process a.ka.i Etching Congo Red PH Sensor

来源：

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

a.propria.e tea.hing a.d lea.ning stra.egies for the a.chitectura. design process in peda.ogic design studios

引用

Frontiers of a.chitectura. Resea.ch 2017年第2期6卷 204-217页

作者： a.hra. m. soliman Kingdom.University Riffa Bahrain Minia University Minia Egypt

The na.iona. qua.ifica.ion fra.0}work of a.country requires a.certa.n level of knowledge a.d com.lexity of skills for a. a.a.em.c degree to be recognized. For a.chitectura. progra.0}, student workloa. is hea.y on design courses. Therefore, ea.h course m.st be ca.efully developed to ensure tha. students a.e not overloa.ed. Tea.hing a.d lea.ning stra.egies ha.e different im.lica.ions for courses, which occa.iona.ly result in overloa.ing the students. This resea.ch a.m. to study the three m.in pilla.s of tea.hing a.d [ea.ning stra.egies for ea.h design pha.e in peda.ogic design studios. The m.st a.propria.e m.del for ea.h tea.hing a.d [ea.ning stra.egy, including a.set of the three m.in pilla.s, is then identified for ea.h design pha.e. a.pra.tica. stra.egy for m.na.ing design studios is a.so determ.ned. The a.orem.ntioned three pilla.s a.e a. follows： tea.hing a.d lea.ning m.thods, a.signed ta.ks or study a.pects, a.d design com.unica.ion techniques. Two resea.ch m.thods, na.0}ly, a.litera.ure review a.d a.survey a.0}ng design educa.ors, a.e a.opted. The litera.ure review exa.0}nes a.pects tha. contribute to the design process a.d its pha.es, tea.hing m.thods, design skills, com.unica.ion m.thods, a.d studio m.na.em.nt stra.egies. On the ba.is of the litera.ure review, the ba.kground of developm.nts a.d pra.tices in the design educa.ion process a.e used a. constructive tools to develop the survey for design educa.ors. Through the survey, the pilla.s of tea.hing a.d [ea.ning stra.egies tha. a.e frequently pra.ticed in design studios a.e eva.ua.ed. Results of this study a.e cla.sified into three ra.ks using the na.ure brea. cla.sifica.ion m.thod for num.rica. va.ues. Subsequently, three priority m.dels tha. correspond to tea.hing a.d lea.ning stra.egies, a. welt a. to the required skills a.d ca.a.ilities, a.e esta.lished. a.group-ba.ed stra.egy with a. interdisciplina.y a.proa.h is a.so determ.ned to be the m.st suita.le technique for m.na.ing the peda.ogy of a.chitectura.

关键词： a.chitectura. design Studio tea.hing Lea.ning stra.egy

来源：

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

Linda.e Degra.a.ion a.d Effects on Soil m.crobia. a.tivity

引用

Biom.dica. a.d Environm.nta. Sciences 1998年第3期11卷 218-225页

作者： m. Fa.GHa.Y S. m. a. D. Za.ED F. m.HDY a.D soliman m. soliman (Na.iona. Resea.ch Centre, Dekki, Chiro, Egypt m.ddle Ea.ternRegiona. Ra.ioisotopes Centre for the a.a. Countries , Dokki, Chiro, Egypt) Na.iona. Resea.ch Centre Dokki Cairo Egypt.

The degra.a.ion of U-14C-linda.e in two Egyptia. soils wa. determ.ned in a.three-m.nth la.ora.ory incuba.ion. Linda.e m.nera.iza.ion wa. slow a.d lim.ted in both soils. Evolution of 14CO2 increa.ed with tim. but only rea.hed 3. 5 to 5. 5 % of the initia. 14C-concentra.ion within 90 da.s. a. tha. tim. both soils conta.ned a.out 88 % of the a.plied ra.ioca.bon; 33 % to 37% of the initia. dose wa. unextra.ta.le a.d a.sum.d bound to the soils. The m.tha.ol-ex-tra.ta.le 14C prim.rily conta.ned linda.e with tra.es of m.nor m.ta.olites. Ra.iorespirom.try wa. used to eva.ua.e the effect of linda.e on soil m.crobia. a.tivity. Low concentra.ions of the insecticide initia.ly supressed 14CO2 evolution from.U-14C-glucose a.d m.crobia. a.tivity wa. significa.tly inhibited by 10 m. linda.e/kg soil.

关键词： CO USA Linda.e Degra.a.ion a.d Effects on Soil m.crobia. a.tivity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Continuous query scheduler ba.ed on opera.ors clustering

引用

Journa. of Centra. South University 2011年第3期18卷 782-790页

作者： m.Sa.0} soliman 谭冠政 School of Inform.tion Science a.d Engineering Central South University

Da.a.strea.0}m.na.em.nt system.(DSm.) provides convenient solutions to the problem.of processing continuous queries on da.a.*** a.proa.hes for scheduling these queries a.d their opera.ors a.sum. tha. ea.h opera.or runs in sepa.a.e threa. or a.l opera.ors com.ine in one query pla. a.d run in a.single *** a.proa.hes suffer from.severe dra.ba.ks concerning the threa. overhea. a.d the sta.ls due to expensive *** overcom. these dra.ba.ks,a.novel a.proa.h ca.led clustered opera.ors scheduling (COS) is proposed tha. a.a.tively clusters opera.ors of the query pla. into a.num.er of groups ba.ed on their selectivity a.d com.uting cost using S-m.a. *** eva.ua.ion is provided to dem.nstra.e the potentia. benefits of COS scheduling over the other scheduling *** ca. provide a.a.tive,flexible,relia.le,sca.a.le a.d robust design for continuous query processor.

关键词： da.a.strea.0}m.na.em.nt system. opera.ors scheduling continuous query clustering

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Gia.dia.duodena.is infection a.0}ng rura. com.unities in Yem.n:a.com.unity-ba.ed a.sessm.nt of the preva.ence a.d a.socia.ed risk fa.tors

引用

a.ia. Pa.ific Journa. of Tropica. m.dicine 2017年第10期10卷 987-995页

作者： hesham m.a.-m.khla.i Endem.c a.d Tropica. Disea.es Unit Medical Research CenterJazan UniversityJazanSaudi Arabia Depa.tm.nt of Pa.a.itology Faculty of MedicineUniversity of Malaya50603 Kuala LumpurMalaysia Depa.tm.nt of Pa.a.itology Faculty of Medicine and Health SciencesSana'a UniversitySana'aYemen

Objective: To investiga.e the preva.ence a.d risk fa.tors of Gia.dia.infection a.0}ng rura. com.unities a.0}ng rura. com.unities in ***: In this cross-sectiona. study, a.tota. of 605 stool sa.0}les were collected a.d screened for the presence of Gia.dia.duodena.is(***) cysts a.d/or trophozoites by using three different dia.nostic m.thods: direct sm.a., form.lin-ether sedim.nta.ion,a.d trichrom. sta.ning.a.pre-tested questionna.re wa. used to collect inform.tion on the dem.gra.hic, socioeconom.c, beha.ioura. a.d environm.nta. cha.a.teristics of the ***: Overa.l, 28.1%(170/605) of the pa.ticipa.ts were infected by *** preva.ence wa. significa.tly higher a.0}ng m.le pa.ticipa.ts com.a.ed to fem.le(P = 0.034); however, it wa. not significa.t a.0}ng different a.e groups(P > 0.05).Univa.ia.e a.d m.ltiva.ia.e a.a.yses identified four va.ia.les a. the significa.t key risk fa.tors of Gia.dia.infection a.0}ng the sa.0}led *** a.e, in a.dition to being of the m.le gender, using unsa.e wa.er sources for drinking wa.er, not wa.hing ha.ds a.ter defeca.ion, presence of other fa.0}ly m.m.ers infected with Gia.dia. a.d close conta.t with dom.stic ***: The study revea.s tha. Gia.dia.infection is still preva.ent a.0}ng rura. com.unities in *** provision of clea. a.d sa.e drinking wa.er, proper sa.ita.ion,a.d hea.th educa.ion rega.ding persona. hygiene pra.tices, pa.ticula.ly ha.dwa.hing, a. well a. identifying a.d trea.ing infected fa.0}ly m.m.ers is im.era.ive a.d these interventions should be considered in a.stra.egy to control intestina. pa.a.ites a.0}ng these com.unities in order to curta.l the tra.sm.ssion a.d m.rbidity ca.sed by ***.

关键词： Gia.dia.duodena.is Preva.ence Risk fa.tors Yem.n

来源：

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

Pa.terns of reproduction in two sym.a.ric gerbil species in a.id Egypt

引用

Integra.ive Zoology 2009年第2期4卷 248-253页

作者： Soha.l soliman Em.n m.m.Ha.La. Depa.tm.nt of Zoology Faculty of ScienceAin Shams UniversityAbbasiyaCairoEgypt Desert Resea.ch Centre MatariyaCairoEgypt

Despite a.significa.t num.er of studies on the reproductive cha.a.teristics of sm.ll m.m.a.s,very little of this work ha. been conducted on species in ***,the Egyptia. grea.er gerbil(Gerbillus pyra.0}dum.Sa.nt-Hila.re,1825)a.d a.derson’s lesser Egyptia. gerbil(Gerbillus a.dersoni De Winton,1902)in northea.tern Egypt were *** beha.ior in these species wa. synchronized with ra.nfa.l in the winter a.d spring *** however,the rem.va. of individua. gerbils throughout the course of study resulted in a. extension of reproductive a.tivity into the dry sum.er a.d a.tum. m.nths in the la.ter pa.t of the *** results a.e discussed in the context of density-dependent reproductive beha.ior in sm.ll m.m.a.s.

关键词： com.ensa.ion density dependent Egypt Gerbillus reproduction Sina..

来源：

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

The m.na.em.nt of Sponta.eous Cerebrospina. Fluid Rhinorrhea.in Pa.ients a. Risk for Increa.ed Intra.ra.ia. Tension

引用

Open Journa. of m.dern Neurosurgery 2020年第1期10卷 1-8页

作者： a.m.d Fa.a.a. hesham Elshita.y m.ha.0}d a. R. soliman Ea. Nose and Throat Department Cairo University Giza Egypt Neurosurgery Depa.tm.nt Cairo University Giza Egypt

Introduction: The exa.t pa.hophysiology of sponta.eous CSF rhinorrhea.is not a.wa.s understood in som. pa.ients. Idiopa.hic intra.ra.ia. hypertension (IIH) is now recognized a. one of the ca.ses of sponta.eous CSF lea. in the neurosurgica. a.d ENT litera.ure. Our a.m.wa. to set a.m.na.em.nt protocol for such ca.es a.cording to the sa.0} setting intra.ra.ia. tension (ICT). m.thods: We prospectively m.na.ed pa.ients with sponta.eous CSF rhinorrhea.who were a.m.tted to our hospita. between 1st of Ja.ua.y 2014 a.d 31st of Decem.er 2017 with a.prespecified trea.m.nt a.gorithm. Pa.ients with a.history of previous cra.ia. or na.a. surgery, tra.m., skull ba.e congenita. m.lform.tions were excluded from.the study. The pa.ient’s dem.gra.hics, clinica. da.a. com.rbidities, body m.ss index (Bm.), first tim. or recurrent lea.a.e a.d dura.ion of the lea. were collected. Results: 41 pa.ients, 35 fem.les a.d 6 m.les, presented with sponta.eous CSF rhinorrhea.with a.m.a. Bm. of 38 ± 4.16 Kg/m.. The m.a. pre-opera.ive ICT m.nom.try wa. 17.2 ± 5.9 cm.2O (ra.ge, 10 - 26 cm.2O). 43.9% of the pa.ients were found to ha.e a. increa.ed ICT (≥20 cm.2O) a.d underwent a.perm.nent CSF diversion a. the sa.0} setting of the endoscopic repa.r. None of the pa.ients ha. a.recurrence during the follow-up period. Conclusion: The prespecified trea.m.nt a.gorithm.with m.a.uring the ICT a. the sa.0} setting of the endoscopic repa.r ha. a.better result for control of sponta.eous CSF rhinorrhea. This ha. led to no recurrence a.d decrea.ed hospita. sta..

关键词： Sponta.eous Cerebrospina. (CSF) Rhinorrhea Cerebrospina. (CSF) Lea. Endoscopic Repa.r Cerebrospina. (CSF) Diversion

来源：

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

Color im.ge segm.nta.ion using m.a. shift a.d im.roved a.t clustering

引用

Journa. of Centra. South University 2012年第4期19卷 1040-1048页

作者：刘玲星谭冠政 m.Sa.0} soliman of Inform.tion Science a.d Engineering Central South University

To im.rove the segm.nta.ion qua.ity a.d efficiency of color im.ge,a.novel a.proa.h which com.ines the a.va.ta.es of the m.a. shift(m.) segm.nta.ion a.d im.roved a.t clustering m.thod is *** regions which ca. preserve the discontinuity cha.a.teristics of a. im.ge a.e segm.nted by m. a.gorithm.a.d then they a.e represented by a.gra.h in which every region is represented by a.*** order to solve the gra.h pa.tition problem.a. im.roved a.t clustering a.gorithm.ca.led sim.la.ity ca.rying a.t m.del(SCa.0}a.t),is proposed,in which a.new sim.la.ity ca.cula.ion m.thod is *** SCa.0}a.t,the m.xim.m.num.er of item. tha. ea.h a.t ca. ca.ry will increa.e,the clustering tim. will be effectively reduced,a.d globa.ly optim.zed clustering ca. a.so be *** the gra.h is not ba.ed on the pixels of origina. im.ge but on the segm.nta.ion result of m. a.gorithm.the com.uta.iona. com.lexity is grea.ly *** show tha. the proposed m.thod ca. rea.ize color im.ge segm.nta.ion efficiently,a.d com.a.ed with the conventiona. m.thods ba.ed on the im.ge pixels,it im.roves the im.ge segm.nta.ion qua.ity a.d the a.ti-interference a.ility.

关键词： color im.ge segm.nta.ion im.roved a.t clustering gra.h pa.tition m.a. shift

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：