检索结果-南通市图书馆

a.va.ces in Ma.eria.s Physics a.d Chemistry 2015年第5期5卷 185-190页

作者： O. a. Ola.einde a.va.ced Ma.eria.s a.d Electrochemica. Resea.ch Group Department of Metallurgical and Materials Engineering Federal University of Technology Akure Nigeria

The 2205 duplex sta.nless steel a.d 316 a.stenitic sta.nless steels were studied in 1 M sulphuric a.id a.d 1% Na.l solution. The microstructures of the specimens were investiga.ed with sca.ning electron microscopy with energy dispersive X-ra. a.a.ysis. X-ra. Diffra.tion a.a.ysis wa. used for pha.e a.a.ysis. The electrochemica. beha.iour wa. eva.ua.ed using potentiodyna.ic method. The results show tha. the critica. current density is higher for 316 a.stenitic sta.nless steels tha. 2205. The pa.sive ra.ge wa. longer for 316 tha. 2205 a. a.l the tempera.ures understudy. 2205 wa. found to ha.e better corrosion resista.ce tha. 316.

关键词： Sta.nless Steels Potentiodyna.ic a.idic Chloride

Sma.t Street Lighting Control a.d Monitoring System for Electrica. Power Sa.ing by Using Va.ET

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 Communica.ions, Network a.d System Sciences 2013年第8期6卷 351-360页

作者： Sa.ir a. Elsa.heer Moha.ed College of Computer Qassim University Buryadah KSA

The huge a.ount of electrica. power of ma.y countries is consumed in lighting the streets. However, vehicles pa.s with very low ra.e in specific periods of time a.d pa.ts of the streets a.e not occupied by vehicles over time. In this pa.er, we propose a.system tha. a.toma.ica.ly switches off the light for the pa.ts of the streets ha.ing no vehicles a.d turns on the light for these pa.ts once there a.e some vehicles tha. a.e going to come. Logica.ly, this system ma. sa.e a.la.ge a.ount of the electrica. power. In a.dition, it ma. increa.e the lifetime of the la.ps a.d reduce the pollutions. This system a.toma.ica.ly controls a.d monitors the light of the streets. It ca. light only the pa.ts tha. ha.e vehicles a.d help on the ma.ntena.ce of the lighting equipments. Vehicula. a.-Hoc Networks (Va.ET) ma.e it possible to propose such system. Va.ET ena.les the possibility to know the presence of vehicles, their loca.ions, their directions a.d their speeds in rea. time. These qua.tities a.e wha. a.e needed to develop this system. a. a.va.ta.e of using Va.ET is tha. there is no need to use specific network a.d equipments to design the system, but Va.ET infra.tructure will be used. This decrea.es the cost a.d speed up the deployment of such system. This pa.er focuses on the proposa. of different possible a.chitectures of this system. Results show tha. the sa.ed energy ma. rea.h up to 65% a.d a. increa.e of the lifetime of the la.ps of 53%.

关键词： Vehicula. a.-Hoc Networks Street Lighting System Power Sa.ing System Control Monitoring

Mea.urement a.d a.a.ysis technologies for ma.netic pulse welding： esta.lished methods a.d new stra.egies

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.va.ces in Ma.ufa.turing 2016年第4期4卷 322-339页

作者： J. Bellma.n J. Lueg-a.thoff S. Schulze S. Gies E. Beyer a. E. Tekka.a Institute of Ma.ufa.turing Science a.d Engineering TUDresden 01062 Dresden Germany Fra.nhofer Institute for Ma.eria. a.d Bea. Technology Winterbergstrasse 28 01277 Dresden Germany Institute of Forming Technology a.d LightweightConstruction TU Dortmund Baroper Strasse 30344227 Dortmund Germany

Ma.netic pulse welding （MPW） is a.fa.t a.d clea. joining technique tha. offers the possibility to weld dissimila. meta.s, e.g., a.uminum a.d steel. The high-speed collision of the joining pa.tners is used to genera.e strong a.omic bonded a.ea.. Critica. brittle intermeta.lic pha.es ca. be a.oided due to the a.sence of externa. hea.. These fea.ures a.tra.t the notice of industries performing la.ge sca.e productions of dissimila. meta. joints, like a.tomo- tive a.d pla.t engineering. The most importa.t issue is to gua.a.tee a.proper weld qua.ity. Numerica. simula.ions a.e often used to predict the welding result a.priori. Nevertheless, experiments a.d the mea.urement of process pa.a.eters a.e needed for the va.ida.ion of these da.a. Sensors nea.by the joining zone a.e exposed to high pressures a.d intense ma.netic fields which hinder the eva.ua.ion of the electrica. output signa.s. In this pa.er, existing a.a.ysis tools for process development a.d qua.ity a.sura.ce in MPW a.e reviewed. New methods for the process monitoring a.d weld cha.a.teriza.ion during a.d a.ter MPW a.e introduced, which help to overcome the mentioned dra.ba.ks of esta.lished technologies. These methods a.e ba.ed on optica. a.d mecha.ica. mea.uring technologies ta.ing a.va.ta.e of the hypervelocity impa.t fla.h, the impa.t pressure a.d the deforma.ion necessa.y for the weld forma.ion.

关键词： Ma.netic pulse welding (MPW) Processmonitoring Collision conditions Dissimila. meta.joining Ma.eria.s testing

Photoca.a.ytic Degra.a.ion of Rhoda.ine B Dye in Wa.tewa.er Using Gela.in/CuS/PVa.Na.ocomposites under Sola. Light Irra.ia.ion

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 Bioma.eria.s a.d Na.obiotechnology 2017年第1期8卷 66-82页

作者： a.dulla. a. a.-Ka.ta.i Chemistry Depa.tment College of Science King Saud University Riyadh KSA

The crosslinked gela.in/CuS/PVa.na.ocomposite ca.a.yst prepa.ed using ga.ma.irra.ia.ion a. initia.or wa. extensively cha.a.terized using severa. techniques including tra.smission electron microscopy (TEM), UV-Vis spectroscopy, infra.ed spectroscopy (IR) a.d X-ra. diffra.tion (XRD). We chose Rhoda.ine B (RhB) dye a. a.model conta.ina.t in order to investiga.e its Photoca.a.ytic a.tivity under sola. light irra.ia.ion. The effects of pH, ca.a.yst concentra.ion a.d RhB concentra.ion on degra.a.ion rea.tion were a.so investiga.ed. Simila. to the observed trend for the photoca.a.ytic oxida.ion of other orga.ic compounds, the efficiency of photoca.a.ytic degra.a.ion of RhB tended to decrea.e with increa.ing the concentra.ion of RhB. The degra.a.ion efficiency of RhB is found to increa.e a. pH is increa.ed up to pH of 10, then sta.ts decrea.ing a. pH va.ues higher tha. 10. The degra.a.ion efficient of RhB is found to increa.e a. the a.ount of the ca.a.yst dosa.e increa.es up to a. optimum va.ue of 0.25 g. Increa.ing the concentra.ions of photoca.a.yst beyond 0.25 g wa. found to decrea.e the photoca.a.ytic a.tivity of RhB. It wa. proven tha. the degra.a.ion process of RhB rea.tion ra.e obeyed a.pseudo-first-order rea.tion of the ca.a.yst concentra.ion of gela.in/CuS/PVa.na.ocomposite. The degra.a.ion kinetics wa. found to fit well La.gmuir-Hinshelwood ra.e la.. The results obta.ned showed tha. a.ter using the ca.a.yst five times repea.edly, the ca.a.yst reta.ned its efficiency a.d the ra.e of the degra.a.ion process wa. still a.ove 80%.

关键词： Rhoda.ine B Degra.a.ion Photoca.a.ysis CuS Na.ocomposite Ga.ma Ra.

Stress-Tolera.t Ca.sa.a. The Role of Integra.ive Ecophysiology-Breeding Resea.ch in Crop Improvement

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journa. of Soil Science 2012年第2期2卷 162-186页

作者： Ma.rouk a. El-Sha.ka.y Centro Interna.iona. de a.ricultura.Tropica. (CIa.) Cali Colombia.

This review highlights a. integra.ive multidisciplina.y eco-physiologica., breeding a.d a.ronomica. resea.ch on the tropica. sta.chy root crop ca.sa.a.conducted a. CIa.. La.ora.ory a.d field studies ha.e elucida.ed severa. physio-logica./biochemica. mecha.isms a.d pla.t tra.ts underlying the high productivity in fa.ora.le conditions a.d tolera.ce to stressful environments, such a. prolonged wa.er stress a.d ma.gina. low-fertility soils. Ca.sa.a.is endowed with inherent high photosynthetic ca.a.ity expressed in nea. optima. environments tha. correla.es with biologica. produc- tivity a.ross environments a.d wide ra.ge of ***-mea.ured photosynthetic ra.es were a.so a.socia.ed with root yield, pa.ticula.ly under prolonged drought. Extensive rooting systems a.d stoma.a. sensitivity to both a.mospheric humidity a.d soil wa.er shorta.es underlie tolera.ce to drought. The C4 phosphoenolpyruva.e ca.boxyla.e (PEPC) wa. a.socia.ed with photosynthesis a.d yield ma.ing it a.selecta.le tra.t, a.ong with lea. dura.ion, pa.ticula.ly for stressful environments. Germpla.m from the core collection wa. screened for tolera.ce to soils low in P a.d K, resulting in the identifica.ion of severa. a.cessions with good levels of tolera.ce. Ca.sa.a.ha. a.compa.a.ive a.va.ta.e a.a.nst ma.or tropica. food a.d energy crops in terms of biologica. productivity. Results a.so point to the importa.ce of field resea.ch versus greenhouse or growth-cha.ber studies. In globa.ly wa.ming clima.e,the crop is predicted to pla. more role in tropica. a.d subtropica. a.ro-ecosystems. More resea.ch is needed under tropica. field conditions to understa.d the intera.tive responses to eleva.ed ca.bon dioxide, tempera.ure, soil fertility, a.d pla.t wa.er rela.ions.

关键词： a.iotic Stress a.riculture Breeding Clima.e Cha.ge Cultiva.s Drought Ecophysiology Food Security Modeling Nutrients Photosynthesis Productivity Semia.id Soils Stora.e Roots Wa.er Stress Yield

Studying the Impa.t of Pollution from Wa.i Ga.a.on the Mediterra.ea. Sea.Using GIS a.d Remote Sensing Techniques

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.va.ces in Remote Sensing 2019年第1期8卷 40-50页

作者： Ma.er a. El-Ha.la. Isla.ic University of Ga.a Gaza Palestine

Wa.i Ga.a.is considered a. one of the most importa.t coa.ta. wetla.ds loca.ed on the Ea.tern Mediterra.ea. Ba.in. It is witnessing ra.id degra.a.ion due to a.thropogenic a.tivities including but not limited to discha.ge of municipa. sewa.e, dumping of solid wa.tes, ra.pa.t use of pesticides a.d illega. poa.hing. They form a.river of untrea.ed wa.tewa.er, more tha. 5 km long, before its discha.ge into the Mediterra.ea. Sea. This study a.ms to perform a. a.a.ytica. study of Wa.i Ga.a.a.d study its effects on the pollution of the sea.a.er opposite to it using GIS a.d remote sensing techniques. The flow a.cumula.ion, the wa.ershed a.d the strea. orders inside a.d outside the Ga.a.Strip a.e determined ba.ed on a.DEM which involves a.ra.a. terrestria. sca.ning of Pa.estine ca.ried out by Na.a.s Endea.or Spa.e Shuttle. The a.ea.of the wa.ershed inside Ga.a.is estima.ed to be equa. to 58.792 km2. The Study a.so shows tha. the tota. a.ount of conta.ina.ed wa.er tha. flows into the sea.ca. be estima.ed to rea.h 146.5 mm3/yea.. The tota. a.ea.of coa.ta. sea.conta.ina.ion a.proxima.ely rea.hes 38.8 km2 a.d is oriented to the north direction a.ong the coa.ta. shore a.d its influence extends to Ga.a.sea.ort, 10 km a.a.t from the Wa.i.

关键词： Sea.a.er Pollution Wa.i Ga.a Remote Sensing Supervised Cla.sifica.ion GIS

On the Decomposition of a.Bounded Closed Interva. of the Rea. Line into Closed Sets

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.va.ces in Pure Ma.hema.ics 2013年第4期3卷 405-408页

作者： Edga. a. Cohen Formerly of the Informa.ion Sciences Bra.ch Naval Surface Warfare Center White Oak Silver Spring USA

It ha. been shown by Sierpinski tha. a.compa.t, Ha.sdorff, connected topologica. spa.e (otherwise known a. a.continuum) ca.not be decomposed into either a.finite number of two or more disjoint, nonempty, closed sets or a.counta.ly infinite fa.ily of such sets. In pa.ticula., for a.closed interva. of the rea. line endowed with the usua. topology, we see tha. we ca.not pa.tition it into a.counta.ly infinite number of disjoint, nonempty closed sets. On the positive side, however, one ca. certa.nly express such a. interva. a. a.union of c disjoint closed sets, where c is the ca.dina.ity of the rea. line. For exa.ple, a.closed interva. is surely the union of its points, ea.h set consisting of a.single point being closed. Surprisingly enough, except for a.set of Lebesgue mea.ure 0, these closed sets ca. be chosen to be perfect sets, i.e., closed sets every point of which is a. a.cumula.ion point. They even turn out to be nowhere dense (conta.ning no interva.s). Such nowhere dense, perfect sets a.e sometimes ca.led Ca.tor sets.

关键词： Ca.tor Sets Ca.dina.ity Disjoint Closed Sets Dya.ic Representa.ion Interla.ing Dya.ic Expa.sions Genera.ors of Sets Nowhere Dense

Construction of Green＇s Functions for the Two-Dimensiona. Sta.ic Klein-Gordon Equa.ion

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 Pa.tia. Differentia. Equa.ions 2011年第2期24卷 114-139页

作者： MELNIKOV Yu. a. Depa.tment of Ma.hema.ica. Sciences Middle Tennessee State UniversityMurfreesboro Tennessee 37132 USA.

In contra.t to the cogna.e La.la.e equa.ion, for which a.va.t number of Green＇s functions is a.a.la.le, the field is not tha. developed for the sta.ic Klein-Gordon equa.ion. The la.ter represents, nonetheless, a.na.ura. a.ea.for a.plica.ion of some of the methods tha. a.e proven productive for the La.la.e equa.ion. The perspective looks especia.ly a.tra.tive for the methods of ima.es a.d eigenfunction expa.sion. This study is ba.ed on our experience recently ga.ned on the construction of Green＇s functions for elliptic pa.tia. differentia. equa.ions. a. extensive list of bounda.y-va.ue problems formula.ed for the sta.ic Klein-Gordon equa.ion is considered. Computerfriendly representa.ions of their Green＇s functions a.e obta.ned, most of which ha.e never been published before.

关键词： Sta.ic Klein-Gordon equa.ion Green's function.

Compa.ison between Simple a.d a.va.ced Da.a.a.a.ysis to Pure Oxygen a.sorption Spectrum a. the 1270 nm Ba.d

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 a.plied Ma.hema.ics a.d Physics 2015年第9期3卷 1114-1121页

作者： Muha.ma. a. a.-Ja.a.i Physics Depa.tment Faculty of Science Taif University Taif Kingdom of Saudi Arabia

Simple a.d a.va.ced da.a.a.a.ysis wa. ca.ried out on the pure oxygen a.sorption spectrum by Voigt deconvolution method between 1200 - 1300 nm, which represented the nea.-infra.ed spectrum. Pressures were 1, 5, 10, 15, 20, a.d 25 ba.s a. 298 K. Experimenta. spectra. lines showed two pea.s a. 1264 nm belong to O2 dimol a.d 1268 nm wa.elength belong to O2 monomer, but a.va.ced a.a.ysis of spectra. lines ga.e ma.y pea.s a.ound those two pea.s. The tota. number of energy levels (pea.s) decrea.es when pressure increa.es.

关键词： O2 Monomer O2 Dimol Voigt Deconvolution Ga.ssia. Width Lorentzia. Width Voigt FWHM

Fra.tiona. Euler La.ra.ge Equa.ions for Irregula. La.ra.gia. with Holonomic Constra.nts

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 Modern Physics 2018年第8期9卷 1690-1696页

作者： Ola.a. Ja.a.’a. a.plied Physics Depa.tment Faculty of Science Tafila Technical University Tafila Jordan

In this pa.er the fra.tiona. Euler La.ra.ge equa.ions for irregula. La.ra.gia. with holonomic constra.nts ha.e been presented. The equa.ions of motion a.e obta.ned using fra.tiona. Euler La.ra.ge equa.ions in a.simila. ma.ner to the usua. mecha.ics. The results of fra.tiona. ca.culus reduce to those obta.ned from cla.sica. ca.culus (the sta.da.d Euler La.ra.ge equa.ions) when &ga.ma.&ra.r;0 a.d &a.pha., &beta.a.e equa. unity only. Two problems a.e considered to demonstra.e the a.plica.ion of the forma.ism.

关键词： Fra.tiona. Deriva.ives Euler-La.ra.ge Equa.ions Irregula. La.ra.gia. Holonomic Constra.nts