检索结果-南通市图书馆

Inter.al oscillation cr.ter.a for.for.ed Emden-Fowler.functional dynamic equations with oscillator. potential

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2013年第3期56卷 561-576页

作者： ANDEr.ON douglas r. SAKEr.Samir.H. Depar.ment of Mathematics and Computer.Science Concordia College Depar.ment of Mathematics Faculty of Science Mansoura University

Inter.al oscillation cr.ter.a ar. established for.a second-or.er.functional dynamic equation of Emden-Fowler.type with oscillator. potential by applying r.ccati and gener.lized r.ccati techniques. The r.sults r.pr.sent fur.her.impr.vements on those given even for.differ.ntial and differ.nce equations. Some examples ar. consider.d to illustr.te the main r.sults.

关键词： oscillation for.ed dynamic equations time scales functional equations r.ccati technique

Par.llel bor.n nitr.de nanor.bbons and etch tr.cks for.ed thr.ugh catalytic etching

在线全文

学校读者我要写书评

暂无评论

Nano r.sear.h 2018年第9期11卷 4874-4882页

作者： Ar.in Ansar. Mohsen Nasser. Mathias J. Boland douglas r. Str.chan Depar.ment of Physics &Astr.nomy University of Kentucky Lexington KY40506 USA

One-dimensional （1D） catalytic etching was investigated in few-layer.hexagonal bor.n nitr.de （hBN） films. Etching of hBN was shown to shar. a number.of similar.ties with that of gr.phitic films. As in gr.phitic films, etch tr.cks in hBN commenced at film edges and occur.ed pr.dominantly along cer.ain cr.stal dir.ctions of its lattice, though it was shown that the tr.cks wer. gener.lly nar.ower.than those of few-layer.gr.phene under.similar.pr.cessing conditions. It was also shown that catalytic hydr.genation can occur.completely thr.ugh a few-layer.hBN film, demonstr.ting that this pr.cess can be used in the for.ation of isolated low-dimensional nanoscale str.ctur.s fr.m other.layer.d 2D mater.als beyond gr.phene. This ability for.thin hBN films to be etched completely thr.ugh allowed for.a cr.stalline substr.te to guide the etching pr.cess, which was demonstr.ted with the successful etch tr.ck for.ation of few-layer.hBN on single-cr.stalline sapphir. substr.tes. The substr.te-guided etching r.sulted in par.llel few-layer.hBN nanor.bbons having an aver.ge width of 32 nm and spacing of 13 nm.

关键词： hexagonal(hBN) one-dimensional catalytic etching hydr.genation etch tr.cks nanor.bbons

High Per.or.ance r.ng Oscillator. fr.m 10-nm Wide Silicon Nanowir. Field-Effect Tr.nsistor.

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

Nano r.sear.h 2011年第10期4卷 1005-1012页

作者： r.o-Gu Huang douglas Tham Dunwei Wang James r. Heath Depar.ment of Electr.cal Engineer.ng Calilfomia Institute of Technology MC 136-93 Pasadena CA 91125 USA Division of Chemistr. and Chemical Engineer.ng California Institute of Technology MC 127-72 Pasadena CA 91125 USA Depar.ment of Chemistr. Boston College 140 Commonwealth Ave Chestnut Hill Massachusetts 02467 USA

We explor. 10-nm wide Si nanowir. （SiNW） field-effect tr.nsistor. （FETs） for.logic applications, via the fabr.cation and testing of SiNW-based r.ng oscillator.. We r.por. on SiNW sur.ace tr.atments and dielectr.c annealing, for.pr.ducing SiNW FETs that exhibit high per.or.ance in ter.s of lar.e on/off-state cur.ent r.tio （-10s）, low dr.in-induced bar.ier.lower.ng （-30 mV） and low subthr.shold swing （-80 mV/decade）. The per.or.ance of inver.er.and r.ng-oscillator.cir.uits fabr.cated fr.m these nanowir. FETs ar. also explor.d. The inver.er.demonstr.tes the highest voltage gain （-148） r.por.ed for.a SiNW-based NOT gate, and the r.ng oscillator.exhibits near.r.il-to-r.il oscillation center.d at 13.4 MHz. The static and dynamic char.cter.stics of these NW devices indicate that these SiNW-based FET cir.uits ar. excellent candidates for.var.ous high-per.or.ance nanoelectr.nic applications.

关键词： Silicon nanowir. (SiNW) field-effect tr.nsistor.(FET) sur.ace tr.atment inver.er r.ng oscillator

Diphosphine-induced chir.l pr.peller.ar.angement ofgold nanocluster. for.singlet oxygen photogener.tion

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

Nano r.sear.h 2018年第11期11卷 5787-5798页

作者： Jiangwei Zhang Yang Zhou KaiZheng Hadi Abr.shan douglas r. Kauffman Junliang Sun Gao Li State Key Labor.tor. of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China Univer.ity of Chinese Academy of Sciences Beijing 100049 China SUNCAT Center.for.Inter.ace Science and Catalysis Department of Chemical Engineering Stanford University 443 Via Ortegc~ StanfordCalifornia 94305 USA National Ener.y Technology Labor.tor. (NETL) United States Department of Energy Pittsburgh Pennsylvania 15236 USA Beijing National Labor.tor. for.Molecular.Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications College ot Chemistry and Molecular Engineering Peking University Beijing 100871 China

In this study, 1,2-bis(diphenylphosphino)ethane (dppe) ligands ar. used to synthesize gold nanocluster. with an icosahedr.l Au-13 cor.. The nanocluster. ar. char.cter.zed and for.ulated as [Au-13(dppe)5Cl(2)]Cl-3 using synchr.tr.n r.diation X-r.y diffr.ction, UV/Vis absor.tion spectr.scopy, electr.spr.y ionization mass spectr.metr., and density functional theor. (DFT) calculations. The bidentate featur. of dppe ligands and the positions of coor.inating sur.ace gold atoms induce a helical ar.angement that for.s a pr.peller.like str.ctur., which r.duces the symmetr. of the gold nanocluster.to C-1. Ther.for., dppe ligands per.or. as a dir.cting agent to cr.ate chir.l an ansa metallamacr.cycle [Au-13(dppe)(5)Cl-2](3+) nanocluster. as confir.ed by simulated electr.nic cir.ular.dichr.ism spectr.m. The highest occupied molecular.or.ital (HOMO)-lowest unoccupied molecular.or.ital (LUMO) gap of the [Au-13(dppe)(5)Cl-2](3+) cluster.is deter.ined as appr.x. 1.9 eV, and fur.her.confir.ed by ultr.violet photoemission spectr.scopy analysis and DFT simulation. Fur.her.or., the photoactivity of [Au-13(dppe)(5)Cl-2](3+) is investigated, with the nanocluster.shown to possess near.infr.r.d photoluminescence pr.per.ies, which can be employed for.O-1(2) photogener.tion. The quantum yield of O-1(2) photogener.tion using the [Au-13(dppe)(5)Cl-2](3+) nanocluster.is up to 0.71, which is consider.bly higher.than those of anthr.cene (an or.anic dye), and Au-25 and Au-38 nanocluster..

关键词： gold nanocluster. Au-13 chir.lity singlet oxygen synchr.tr.n r.diation X-r.y diffr.ction (Xr.)

Adjacent str.ng edge color.ngs and total color.ngs of r.gular.gr.phs

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

Science China Mathematics 2009年第5期52卷 973-980页

作者： WOODALL douglas r School of Mathematical Sciences University of NottinghamNottinghamNG7 2RDUK

It is conjectur.d that X as ′ (G) = X t (G) for.ever. k-r.gular.gr.ph G with no C 5 component (k ? 2). This conjectur. is shown to be tr.e for.many classes of gr.phs, including: gr.phs of type 1; 2-r.gular. 3-r.gular.and (|V(G)| - 2)-r.gular.gr.phs; bipar.ite gr.phs; balanced complete multipar.ite gr.phs; k-cubes; and joins of two matchings or.cycles.

关键词： gr.ph total color.ng adjacent str.ng edge color.ng 05C15 68r.0

HYEr.-ULAM STABILITY OF SECOND-Or.Er.LINEAr.DYNAMIC EQUATIONS ON TIME SCALES

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2021年第5期41卷 1809-1826页

作者： douglas r.ANDEr.ON Masakazu ONITSUKA Depar.ment of Mathematics Concordia CollegeMoorheadMN 56562 USA Depar.ment of Applied Mathematics kayama University of ScienceOkayama700-0005Japan

We investigate the Hyer.-Ulam stability(HUS)of cer.ain second-or.er.linear.constant coefficient dynamic equations on time scales,building on r.cent r.sults for.fir.t-or.er.constant coefficient time-scale *** par.icular.for.the case wher. the r.ots of the char.cter.stic equation ar. non-zer. r.al number. that ar. positively r.gr.ssive on the time scale,we establish that the best HUS constant in this case is the r.cipr.cal of the absolute pr.duct of these two *** for.instability ar. also given.

关键词： stability second or.er Hyer.-Ulam time scales

Ionic liquid/tetr.glyme hybr.d Mg[TFSI]_2 electr.lytes for.r.char.eable Mg batter.es

在线全文

学校读者我要写书评

暂无评论

Gr.en Ener.y & Envir.nment 2019年第2期4卷 146-153页

作者： Zheng Ma Mar.a For.yth douglas r.MacFar.ane Mega Kar School of Chemistr. Faculty of Science Monash University Ar. Centr. of Excellence for.Electr.mater.als Science IFM – Institute for Frontier Materials Deakin University

The electr.chemical r.ver.ibility of Mg in hybr.d electr.lytes based on mixtur.s of ionic liquid and glyme based or.anic solvents was investigated for.applications in r.char.eable magnesium batter.es(r.Bs). The electr.lytes demonstr.te r.ver.ible r.duction and oxidation of Mg only after.being pr.-tr.ated with the dehydr.ting agent, magnesium bor.hydr.de, Mg[BH_4]_2, highlighting the impor.ance of r.moving water.in Mg based electr.lytes. The addition magnesium di[bis(tr.fluor.methanesulfonyl)imide](Mg[TFSI]_2)(0.3 M) to N-butyl-n-methyl-pyr.olidinium bis(tr.fluor.methanesulfonyl)imide [C4 mpyr.[TFSI]/tetr.glyme at a mole r.tio of 1:2 showed stable CV cycling over.almost 300 cycles while scanning electr.n micr.scopy(SEM) and X-r.y diffr.ction(Xr.) confir.ed Mg deposition, showing non-dendr.tic mor.hology and a well-aligned gr.wth. Fur.her.ther.ogr.vimetr.c analysis(TGA) demonstr.ted a mass r.tention of 79% at 250℃ for.this electr.lyte suggesting that the pr.sence of the ionic liquid incr.ases ther.al stability substantially making these hybr.d electr.lytes compatible for.r.Bs.

关键词： Mg[TFSI]2 Ionic liquids Tetr.glyme r.char.eable Mg batter. Mg[BH4]2 dehydr.te r.agent

The effect of epigenetic sper. abnor.alities on ear.y embr.ogenesis

在线全文

学校读者我要写书评

暂无评论

Asian Jour.al of Andr.logy 2006年第2期8卷 131-142页

作者： Benjamin r. Emer. douglas T.Car.el Andr.logy & IVF Labor.tor.es Department of Physiology Depar.ment of Obstetr.cs and Gynecology School of Medicine University of UtahSalt Lake CityUtah 84108USA

Sper. ar. a highly specialized cell type der.ved to deliver.the pater.al haploid genome to the oocyte. The epigenetic, or.gene r.gulator., pr.per.ies and mechanisms of the sper. assist in pr.par.tion of the pater.al genome to contr.bute to embr.ogenesis and the genome of the zygote. Many r.cent studies have addr.ssed the issue of alter.d epigenetic pr.cesses in the sper.. This r.view evaluates the cur.ent under.tanding of DNA damage, chr.mosome aneuploidy, r.duced telomer. length, malfor.ations of the centr.some, genomic impr.nting er.or., alter.d mr.A pr.files, and abnor.al nuclear.packaging in the sper. pr.or.to fer.ilization and the obser.ed effects on embr.ogenesis. Attention has also been given to under.tanding the under.ying etiology of sper. with alter.d epigenetic mechanisms in humans. （Asian J Andr.l 2006 Mar. 8： 131-142）

关键词： embr.ogenesis DNA damage impr.nting aneuploidy telomer. centr.some nuclear.packaging male infer.ility

The discipline of teams

在线全文

学校读者我要写书评

暂无评论

The discipline of teams