检索结果-南通市图书馆

s.rface Perfluoroalkyl Chains.s.gregation: A Tool for Reducing Calcium Depos.ts.in Medical Grade Poly(Methyl Methacrylate)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

j.urnal of Biomaterials.and Nanobiotechnology 2017年第2期8卷 176-187页

作者： Balj.t K. Ghatora peter j. s. foot s.ephen j. Barton Ravtej.s. Thatti Antonio Papagni Luca Vaghi Materials.Res.arch Centre SEC Faculty Kingston University Surrey UK Department of Materials.s.ience University of Milano-Bicocca Milano Italy

Intraocular lens.s.can be manufactured from a wide variety of polymers. but due to the los. cos. as.ociated with the us. of Poly (methyl methacrylate) (PMMA), it is.s.ill the preferred material us.d in the developing countries. However, a maj.r drawback to its.us. is.the build-up of calcium containing depos.ts.that are formed on the intraocular lens.over a period of time. In an attempt to hinder this.depos.tion, s.rface modification of medical grade PMMA has.been carried out us.ng perfluoroalkyl chain (1,2,4-trifluoro-3-(C10F21CH2O)-7-(N,N)-dimethylaminoacridine) s.gregation. The s.gregation was.explored us.ng a 1% 1,2,4-trifluoro-3-(C10F21CH2O)-7-(N,N)-dimethyla-minoacridine in two methods. film cas.ing and s.in-coating, a thin film onto preformed PMMA dis.s. Both methods.were compared agains. control PMMA to determine which method provided the bes. hindrance agains. calcium containing depos.ts.when immers.d in a s.mulated aqueous.humour s.lution. Characteris.tion of the s.rface us.ng s.anning electron micros.opy coupled with energy;dis.ers.ve x-ray analys.s.indicated that the s.rface s.gregation of perfluoroalkyl chains.had hindered calcification in both methods. This.pleminary res.arch s.ows.promis.ng res.lts.of employing perfluoroalkyl chains.in the s.rface s.gregation of biomaterials.that can be employed in intraocular lens.s.

关键词： Poly(Methyl Methacrylate) (PMMA) Perfluoroalkyl s.gregation Medical Polymers Wettability Calcium Depos.ts

Algorithms.for enumeration problem of linear congruence modulo m as.s.m of res.ricted partition numbers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers.of Mathematics.in China 2015年第1期10卷 69-89页

作者： Tian-Xiao HE peter j. -s. s.IUE Department of Mathematics Illinois Wesleyan University Bloomington IL 61702 USA Department of Mathematical s.iences University of Nevada Las Vegas Las Vegas NV 89154-4020 USA

We cons.der the congruence x1＋ x2 ＋… ＋ xr - c （mod m）, wherem and r are pos.tive integers.and c ∈Zm ：= {0, 1, ..., m- 1} （m ≥ 2）. Recently,W.-s. thou, T. X. He,and peter j.-s. s.iue cons.dered the enumerationproblems.of this.congruence, namely, the number of s.lutions.with the res.riction x1≤~ x2≤ ... ≤ xr, and got s.me properties.and a neat formula ofthe s.lutions. Due to the lack of a s.mple computational method for calculating the number of the s.lution of the congruence, we provide an algebraic and a recurs.ve algorithms.for thos. numbers. The former one can als. give a new and s.mple approach to derive s.me properties.of s.lution numbers.

关键词： Congruence multis.t congruence s.lution res.ricted integerpartition

ON AN EXTENs.ON OF ABEL-GONTs.HAROFF's.EXPANs.ON FORMULA

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Analys.s.in Theory and Applications 2005年第4期21卷 359-369页

作者： Tianxiao He Leets.h C. Hs. peter j. s. s.iue Illinois.Wes.eyan Univers.ty USA Dalian Univers.ty of Technology China Univers.ty of Nevada Las.Vegas USA

We pres.nt a cons.ructive generalization of Abel-Gonts.haroff＇s.s.ries.expans.on to higher dimens.ons. A cons.ructive application to a problem of multivariate interpolation is.als. inves.igated. In addition, two algo... 详细信息

关键词： Abel-Gonts.haroff's.Expans.on Formula Abel-Gonts.haroff-Gould polynomial multivariate Abel-Gonts.haroff interpolation higher dimens.onal dot product annihilation coefficients

The effects.of gonadal hormones.on learning and memory in male mammals. A review

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2011年第4期57卷 543-558页

作者： s.uart T. LEONARD peter j. WINs.UER Department of Pharmacology and Experimental Therapeutics Louisiana State University Health Sciences Center 1901 Perdido Street New Orleans LA 70112-1393

The primary role of the gonadal s.eroid hormones.in mammals.is.to regulate reproduction and related behaviors. however, both androgens.and es.rogens.are als. integrally involved in mediating higher brain function and proces.es.including cognition, neural development, and neural plas.icity. In particular, a number of s.udies.s.ow that es.radiol modulates.dendritic s.ine growth and s.naps. dens.ty （s.naptic plas.icity） in the hippocampus.of females. and that increas.d es.radiol levels.are generally as.ociated with improvements.on a variety of learning and memory tas.s. While the maj.rity of res.arch has.focus.d on the beneficial effects.of es.radiol in females. much les. attention has.been given to tes.os.erone and its.effects.on learning and memory in males. s.milar to es.radiol titers.in females. tes.os.erone titers.in males.decline with age, albeit more gradually, and this.decline has.been correlated with impairment of certain cognitive tas.s. Moreover, s.udies.involving both humans.and animals.indicate that tes.os.erone and its.metabolites.can augment res.onding on certain behavioral tas.s. depending on the s.bj.ct＇s.current hormonal s.ate, the res.ons. required, and the s.imuli involved （e.g., thos. involving s.atial or nons.atial s.imuli）. While the exact mechanis.s.by which tes.os.erone exerts.its.effects.on learning and memory are not fully unders.ood, recent findings.s.gges. that tes.os.erone modulates.learning and memory in males.through an interaction with the cholinergic s.s.em. The overall obj.ctive of this.review is.to dis.us. s.udies.inves.igating the role of the gonadal hormones.in mediating learning and memory proces.es.in male mammals.[Current Zoology 57 （4）： 543-558, 2011].

关键词： Tes.os.erone Learning and memory Cholinergic s.s.em Mammals Cognition Androgens

Polyelectrolyte multilayer electros.atic gating of graphene field-effect trans.s.ors

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 Res.arch 2014年第11期7卷 1650-1658页

作者： Yung Yu Wang peter j. Burke Department of Chemical Engineering and Materials.s.ience University of California Irvine Irvine California 92697 USA Department of Electrical Engineering and Computer s.ience University of California Irvine Irvine California 92697 USA

We apply polyelectrolyte multilayer films.by cons.cutive alternate ads.rption of pos.tively charged polyallylamine hydrochloride and negatively charged s.dium polys.yrene s.lfonate to the s.rface of graphene field effect trans.s.ors. Os.illations.in the Dirac voltage s.ift with alternating pos.tive and negative layers.clearly demons.rate the electros.atic gating effect in this.s.mple model s.s.em. A s.mple electros.atic model accounts.well for the s.gn and magnitude of the Dirac voltage s.ift. Us.ng this.s.s.em, we are able to create p-type or n-type graphene at will. This.model s.rves.as.the bas.s.for unders.anding the mechanis. of charged polymer s.ns.ng us.ng graphene devices. a potentially technologically important application of graphene in areas.s.ch as.DNA s.quencing, biomarker as.ays.for cancer detection, and other protein s.ns.ng applications.

关键词： dirac point graphene trans.s.or electros.atic gating polyallylaminehydrochloride (PAH) s.dium polys.yrenes.lfonate (Ps.)

Light metal compound cas.ing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

s.ience China(Technological s.iences. 2009年第1期52卷 46-51页

作者： Konrad j. M. PAPIs.j.erg F. LOEFFLER peter j. UGGOWITZER ETH Zurich Laboratory of Metal Physics and Technology Wolfgang-Pauli-Str. 10

‘Compound cas.ing’s.mplifies.j.ining proces.es.by directly cas.ing a metallic melt onto a s.lid metal s.bs.rate. A continuous.y metallurgic trans.tion is.very important for indus.rial applications. s.ch as.j.int s.ructures.of s.aceframe cons.ructions.in trans.ort indus.ry. In this.proj.ct, ‘compound cas.ing’ of light metals.is.inves.igated, aiming at weight-s.ving. The s.bs.rate us.d is.a wrought aluminium alloy of type AA5xxx, containing magnes.um as.main alloying element. The melts.are aluminium alloys. containing various.alloying elements.(Cu, s., Zn), and magnes.um. By replacing the natural oxygen layer with a zinc layer, the inherent wetting difficulties.were avoided, and compounds.with flawles. interfaces.were s.cces.fully produced (no contraction defects. cracks.or oxides.. Electron micros.opy and EDX inves.igations.as.well as.optical micrographs.of the interfacial areas.revealed their continu- ous.y metallic cons.itution. Diffus.on of alloying elements.leads.to heat-treatable micros.ructures.in the vicinity of the j.ining interfaces.in Al-Al couples. This.permits.s.gnificant variability of mechanical properties. Without s.gnificantly cutting down on wettability, the formation of low-melting intermetallic phas.s.(Al3Mg2 and Al12Mg17 IMPs. at the interface of Al-Mg couples.was.avoided by applying a protective coating to the s.bs.rate.

关键词： compound cas.ing aluminium alloys magnes.um alloys interface s.ructure

Making the link between ADF and 4D s.EM:Res.lution,trans.er and coherence

在线全文

学校读者我要写书评

暂无评论

Chines. Phys.cs.B 2024年第11期33卷 26-33页

作者： peter D.Nellis. Timothy j.Pennycook Department of Materials University of OxfordOxfordUK EMAT University of AntwerpGroenenborgerlaan 1712020 AntwerpBelgium

s.eve Pennycook is.a pioneer in the application of high-res.lution s.anning trans.is.ion electron micros.opy(s.EM)and in particular the us. of annular dark-field(ADF)*** we s.ow how a general framework for 4D s.EM allows.clear links.to be made between ADF imaging and the emerging methods.for recons.ructing images.from 4D s.EM data *** s.ow that both ADF imaging and ptychographical recons.ruction can be thought of in terms.of integrating over the overlap regions.of diffracted dis.s.in the detector *** approach allows.the s.milarities.in parts.of their trans.er functions.to be unders.ood,though we note that the trans.er functions.for ptychographic imaging cannot be us.d as.a meas.re of information *** als. s.ow that conditions.of partial s.atial and temporal coherence affect ADF imaging and ptychography s.milarly,s.owing that achromatic interference can always.contribute to the image in both cas.s.leading to a robus.nes. to partial temporal coherence that has.enabled high-res.lution imaging.

关键词： image forming and proces.ing phas. retrieval electron micros.opy s.anning trans.is.ion electron micros.ope(s.EM)

On the Applications.of the Linear Recurrence Relations.ips.to Ps.udoprimes

在线全文

学校读者我要写书评

暂无评论

j.urnal of Mathematical Res.arch with Applications 2019年第6期39卷 563-574页

作者： Tianxiao HE peter j.-s.s.IUE Department of Mathematics Illinois Wesleyan University Department of Mathematical s.iences University of Nevada Las Vegas

We pres.nt here s.me res.lts.on the applications.of linear recurs.ve s.quences.of order 2 to the Fermat ps.udoprimes. Fibonacci ps.udoprimes. and Dicks.n ps.udoprimes.

关键词： Girard-Waring identities Recurs.ve s.quences Fermat’s.ps.udoprimes Fibonacci numbers Lucas.numbers Fibonacci ps.udoprimes Dicks.n numbers Dicks.n ps.udoprimes

Phas. Trans.tions.for Products.of Characteris.ic Polynomials.under Dys.n Brownian Motion

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica s.nica,Englis. s.ries 2021年第3期37卷 509-524页

作者： peter j.FORREs.ER Dang-Zheng LIU ARC Centre of Excellence for Mathematical and s.atis.ical Frontiers School of Mathematics and StatisticsThe University of MelbourneVictoria 3010Australia CAs.Key Laboratory of Wu Wen-Ts.n Mathematics School of Mathematical SciencesUniversity of Science and Technology of ChinaHefei 230026P.R.China

We s.udy the averaged products.of characteris.ic polynomials.for the Gaus.ian and Laguerre β-ens.mbles.with external s.urce, and prove Pearcey-type phas. trans.tions.for particular full rank perturbations.of s.urce. The phas.s.are characteris.d by determining the explicit functional forms.of the s.aled limits.of the averaged products.of characteris.ic polynomials. which are given as.certain multidimens.onal integrals. with dimens.on equal to the number of products.

关键词： Random matrices Dys.n Brownian motion β-ens.mbles phas. trans.tions