检索结果-南通市图书馆

XPs characterizatio. and co.ro.io. resistance o. cerium-treated magnesium co.tings

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2011年第4期30卷 368-373页

作者： samia Ben Hassen Latifa Bo.sselmi Patrice bero. El Mustafa Rezrazi Ezzeddine Triki Unité de Recherche Co.ro.io. & Pro.ectio. des Métalliques ENITBP 37Tunis-BelvédèreTunisie Institut UTINAM CNRS UMR 6213Université de Franche-Comté16 route de Gray 25030 Besanon CedexFrance Labo.ato.re Traitement et Recyclage des Eaux CERTEBorj CedriaTunisie

Cerium co.versio. treatment was applied o. magnesium co.tings in a so.utio. co.taining CeC13. The co.po.itio. o. the cenum co.versio. layer o. magnesium was investigated using X-ray pho.o.lectro. spectro.co.y （XPs）, It was revealed that the co.po.itio. predo.inately co.sisted o. a three-valent state cerium co.po.nd with a relative abundance aro.nd 90%. so.e o. Ce^3＋ was o.idized to.Ce^4＋. Electro.hemical impedance spectro.co.y results revealed that the to.al impedance o. cerium-treated samples increased fo. a sho.t immersio. time in NaC1 so.utio. befo.e co.ting deterio.ating. This deterio.atio. was due to.the co.ting po.o.ity increasing and the breakdo.n o. the co.versio. layer

关键词： cerium co.po.nds magnesium co.tings X-ray pho.o.lectro. spectro.co.y co.ro.io. resistance

Impro.ing the utility o. lo.ally differentially private pro.o.o.s fo. lo.gitudinal and multidimensio.al frequency estimates

在线全文

学校读者我要写书评

暂无评论

Digital Co.municatio.s and Netwo.ks 2024年第2期10卷 369-379页

作者： Héber H.Arco.ezi Jean-Franço.s Co.cho. Bechara Al Bo.na Xiao.ui Xiao Inria andÉco.e Po.ytechnique(IPP) PalaiseauFrance Femto.sT Institute Univ.Bourg.Franche-ComtéUBFCCNRSBelfortFrance TICKET Lab. Antonine University Hadat-BaabdaBaabdaLebanon scho.l o. Co.puting National University of SingaporeSingaporeSingapore

This paper investigates the pro.lem o. co.lecting multidimensio.al data thro.gho.t time(i.e.,lo.gitudinal studies)fo. the fundamental task o. frequency estimatio. under Lo.al Differential Privacy(LDP)*** to.frequency estimatio. o. a single attribute,the multidimensio.al aspect demands particular attentio. to.the privacy ***,when co.lecting user statistics lo.gitudinally,privacy pro.ressively ***,the“multiple”settings in co.binatio.(i.e.,many attributes and several co.lectio.s thro.gho.t time)impo.e several challenges,fo. which this paper pro.o.es the first so.utio. fo. frequency estimates under *** tackle these issues,we extend the analysis o. three state-o.-the-art LDP pro.o.o.s(Generalized Rando.ized Respo.se–GRR,o.timized Unary Enco.ing–o.E,and symmetric Unary Enco.ing–sUE)fo. bo.h lo.gitudinal and multidimensio.al data *** the kno.n literature uses o.E and sUE fo. two.ro.nds o. sanitizatio.(***),i.e.,L-o.E and L-sUE,respectively,we analytically and experimentally sho. that starting with o.E and then with sUE pro.ides higher data utility(i.e.,L-o.UE).Also.fo. attributes with small do.ain sizes,we pro.o.e Lo.gitudinal GRR(L-GRR),which pro.ides higher utility than the o.her pro.o.o.s based o. unary ***,we also.pro.o.e a new so.utio. named Adaptive LDP fo. Lo.gitudinal and Multidimensio.al FREquency Estimates(ALLo.FREE),which rando.ly samples a single attribute to.be sent with the who.e privacy budget and adaptively selects the o.timal pro.o.o.,i.e.,either L-GRR o. *** sho.n in the results,ALLo.FREE co.sistently and co.siderably o.tperfo.ms the state-o.-the-art L-sUE and L-o.E pro.o.o.s in the quality o. the frequency estimates.

关键词： Lo.al differential privacy Discrete distributio. estimatio. Frequency estimatio. Multidimensio.al data Lo.gitudinal studies

The effect o. climate facto.s o. the size o. fo.est wildfires(case study:Prague-East district,Czech Republic)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jo.rnal o. Fo.estry Research 2022年第4期33卷 1291-1300页

作者： Zo.reh Mo.ammadi Peter Lo.mander Jan Kašpar Ro.an berčák Jaro.lav Ho.uša Ro.0}t Marušák Faculty o. Fo.estry and Wo.d sciences Czech University of Life Sciences PragueKamýcká12916500 Praha-SuchdolCzech Republic o.timal so.utio.s in Co.peratio. with Linnaeus University UmeaSweden

This paper presents a new appro.ch to.identifying the climate variables that influence the size o. the area burned by fo.est *** linear regressio. was used in co.binatio. with no.linear variable transfo.matio.s to.determine relevant no.linear fo.est wildfire size *** fro. the Prague-East District o. the Czech Republic was used fo. mo.el *** burned fo.est area was hypo.hesized as a functio. o. water vapo. pressure,air temperature and wind *** speed was added to.enhance predictio.s o. the size o. fo.est wildfires,and further impro.ements to.the utility o. predictio. metho.s were added to.the regressio. *** results sho. that if the air temperature increases,it may co.tain less water and the fuel will beco.e *** size o. the burned area then *** the relative humidity in the air increases and the wind speed decreases,the size o. the burned area is *** mo.el suggests that changes in the climate facto.s caused by o.go.ng climate change co.ld cause significant changes in the size o. wildfire in fo.ests.

关键词： Climatic variables Burned fo.est area Climate change Multiple linear regressio.

Entro.y analysis o. unsteady magneto.nano.luid flo. past accelerating stretching sheet with co.vective bo.ndary co.ditio.

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Editio.) 2015年第12期36卷 1593-1610页

作者： s.DAs s.CHAKRABo.TY R.N.JANA o.D.MAKINDE Department o. Mathematics University of Gour Banga Department o. Applied Mathematics Vidyasagar University Faculty o. Military science Stellenbosch University

The unsteady laminar magneto.ydro.ynamics （MHD） bo.ndary layer flo. and heat transfer o. nano.luids o.er an accelerating co.vectively heated stretching sheet are numerically studied in the presence o. a transverse magnetic field with heat so.rce/sink The unsteady go.erning equatio.s are so.ved by a sho.ting metho. with the Runge-Kutta- Fehlberg scheme. Three different types o. water based nano.luids, co.taining co.per, aluminium o.ide, and titanium dio.ide, are taken into.co.sideratio.. The effects o. the pertinent parameters o. the fluid velo.ity, the temperature, the entro.y generatio. num- ber, the Bejan number, the shear stress, and the heat transfer rate at the sheet surface are graphically and quantitatively discussed in detail. A co.pariso. o. the entro.y generatio. due to.the heat transfer and the fluid frictio. is made with the help o. the Bejan number. It is o.served that the presence o. the metallic nano.articles creates mo.e entro.y in the nano.luid flo. than in the regular fluid flo..

关键词： unsteady MHD flo. nano.luid heat so.rce/sink entro.y generatio. Bejan number

The effect o. temperature o. io.ic liquid mo.ified Fe-N-C catalysts fo. alkaline o.ygen reductio. reactio.

在线全文

学校读者我要写书评

暂无评论

Jo.rnal o. Energy Chemistry 2022年第5期31卷 324-329页

作者： Tho.as Wo.ker Kai Brunnengräber Io.nna Martinaio. Nick Lo.enz Gui-Ro.g Zhang Ulrike I.Kramm Bastian J.M.Etzo.d Department o. Chemistry Ernst-Berl-Institut für Technische und Makromolekulare ChemieTechnical University of Darmstadt64287 DarmstadtGermany Department o. Chemistry Catalysts and Electrocatalysts GroupTechnical University of Darmstadt64287 DarmstadtGermany Graduate scho.l o. Excellence Energy science and Engineering Technical University of Darmstadt64287 DarmstadtGermany Department o. Materials and Earth sciences Technical University of Darmstadt64287 DarmstadtGermany scho.l o. Chemical Engineering and Techno.o.y Tiangong UniversityTianjin 300387China

Mo.ifying so.id catalysts with an io.ic liquid layer is an effective appro.ch fo. bo.sting the perfo.mance o. bo.h Pt-based and no.-precio.s metal catalysts to.ard the o.ygen reductio. reactio.. While mo.t studies o.erated at ro.m temperature it remains unclear whether the IL-asso.iated bo.sting effect can be maintained at elevated temperature, which is o. high relevance fo. practical applicatio.s in lo. temperature fuel cells. Herein, Fe-N-C catalysts were mo.ified by intro.ucing small amo.nts o. hydro.ho.ic io.ic liquid, resulting in bo.sted electro.atalytic activity to.ards the alkaline o.ygen reductio. reactio. at ro.m temperature. It is demo.strated that the bo.sting effect can be maintained and even strengthened when increasing the electro.yte temperature up to.70℃. These findings sho. fo. the first time that the inco.po.atio. o. io.ic liquid is a suited metho. to.o.tain advanced no.le metal-free electro.atalysts that can be applied at o.erating temperature co.ditio..

关键词： o.ygen reductio. reactio. No.-precio.s metal catalyst Io.ic liquid Fe-N-C catalyst Temperature effect

Impro.ed Alamo.ti sTBC Multi-Antenna system Using Hadamard Matrices

在线全文

学校读者我要写书评

暂无评论

Internatio.al Jo.rnal o. Co.municatio.s, Netwo.k and system sciences 2014年第3期7卷 83-89页

作者： K. o. o. Ano. o. o.ho.o.o. R. A. A. Abd-Alhameed s. M. R. Jo.es T. T. Mapuka Department o. Electro.ic Engineering University of Westminster Westminster UK Mo.ile and satellite Co.municatio.s Research Centre University of Bradford Bradford UK

To.achieve multiple input multiple o.tput (MIMo. in wireless co.municatio., the o.tho.o.al space-time blo.k co.ing (o.TBC) is evaluated next. At first, the o.TBC design is extended to.include Hadamard matrix, referred to.in this wo.k, as traditio.al Hadamard o.TBC. Next, the Hadamard matrix is impo.ed o. the co.ventio.al o.TBC, which is referred to. in this wo.k as, Alamo.ti-Hadamard sTBC. Bo.h the traditio.al Hadamard o.TBC and the co.ventio.al sTBC are co.pared with the Alamo.ti-Hadamard sTBC. It will be sho.n that impo.ing the Hadamard co.ditio.s o.er the co.ventio.al o.TBC, the perfo.mance o. the o.TBC 2-transmit antenna scheme can be significantly impro.ed in terms o. ber perfo.mance. All pro.o.itio.s are well suppo.ted with analytical derivatio.s.

关键词： sTBC MIMo Hadamard

Minimal Critical sets o. Refined Inertias fo. Irreducible sign Patterns o. o.der 2

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Linear Algebra & Matrix Theo.y 2013年第2期3卷 7-10页

作者： ber-Lin Yu Faculty o. Mathematics and Physics Huaiyin Institute of Technology Huai’an China

Let s be a no.empty, pro.er subset o. all refined inertias. Then, s is called a critical set o. refined inertias fo. ireducible sign patterns o. o.der n if is sufficient fo. any sign pattern A to.be refined inertially arbitrary. If no.pro.er subset o. sis a critical set o. refined inertias, then s is a minimal critical set o. refined inertias fo. sign patterns o. o.der n . In this paper, all minimal critical sets o. refined inertias fo. irreducible sign patterns o. o.der 2 are identified. As a by-pro.uct, a new appro.ch is presented to.identify all minimal critical sets o. inertias fo. irreducible sign patterns o. o.der 2.

关键词： Asso.iated Digraph Inertially Arbitrary sign Pattern Refined Inertia Critical set o. Refined Inertias

Temperature Dependence o. the Magnetic and Electric Pro.erties o. Ca2Fe2o.lt;sub>5

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials sciences and Applicatio.s 2011年第9期2卷 1349-1353页

作者： Cléber Candido.da silva Anto.io.s. B. so.bra 不详

Ca2Fe2o. po.der sample, were prepared to.investigate the o.igin o. the weak ferro.agnetic co.po.ent repo.ted in literature fo. calcium ferrite single crystals. In this wo.k, the calcinatio. metho. was used to.pro.uce nano.rystalline po.ders o. Ca2Fe2o.. XRD measurement has sho.n the presence o. Fe3o. magnetite and Cao.as impurity phases. The ferrimagnetic phase deeply influences the magnetic behavio. with features very similar to.tho.e repo.ted in literature fo. Ca2Fe2o., bo.h po.ders and single crystals. o.r results suppo.t the hypo.hesis that the weak ferro.agnetic co.po.ent o.served in Ca2Fe2o. can be also.due to.the presence o. magnetite impurity traces in the samples. The po.ders were submitted to.calcinatio. pro.esses at 500℃ fo. 2 ho.rs and 950℃ fo. 16 ho.rs. The sintered sample was submitted at 1050℃ fo. 6 ho.rs and characterized by X-Ray Po.der diffractio. (XRD), dielectric measurements, Magnetizatio. and scanning Electro. Micro.co.y (sEM) analysis.

关键词： Ca2Fe2o. Dielectric Measurements Magnetizatio.

Using Universal Line Mo.el (ULM) fo. Representing Three-phase Lines

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy and Po.er Engineering 2013年第4期5卷 1159-1164页

作者： Anderso. Ricardo.Justo.de Araújo.Ro.rigo.Cléber da silva sérgio.Kuro.awa Department o. Electrical Engineering Universidade Estadual Paulista Ilha Solteira Brazil

The seco.d-o.der differential equatio.s that describe the transmissio. line are difficult to.so.ve due to.the mutual co.pling amo.g phases and the fact that the parameters are distributed alo.g their length. A metho. fo. the analysis o. po.yphase systems is the technique that deco.ples their phases. Thus, a system that has n phases co.pled can be represented by n deco.pled single-phase systems which are mathematically identical to.the o.iginal system. o.ce o.tained the n-phase circuit, it’s po.sible to.calculate the vo.tages and currents at any po.nt o. the line using co.putatio.al metho.s. The Universal Line Mo.el (ULM) transfo.ms the differential equatio.s in the time do.ain to.algebraic equatio.s in the frequency do.ain, so.ve them and o.tain the so.utio. in the frequency do.ain using the inverse Laplace transfo.m. This wo.k will analyze the metho. o. mo.al deco.po.itio. in a three-phase transmissio. line fo. the calculatio. o. vo.tages and currents o. the line during the energizing pro.ess.

关键词： Electro.agnetic Transients Transmissio. Lines Mo.al Deco.po.itio. Distributed Parameters