检索结果-南通市图书馆

SURFACE MODIFICATION OF TITANIUM FILMS WITH SODIUM ION IMPLANTATION:SURFACE PROPERTIES AND PROTEIN ADSORPTION

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

Acta Metallurgica Sinica(English Letters) 2007年第2期20卷 148-156页

作者： k. y. Cai College of Bioengineering Chong Qing University Chongqing 400044 China

Sodium implanted titanium films with different ion doses were characterized to correlate their ion implantation parameters. Native titanium films and ion implanted titanium films were characterized with combined techniques of X-ray.photoelectron spectroscopy.（XPS）, atomic force microscopy.（AFM）, and light microscopy.（LM）. The surface presented increased sodium concentration on treated titanium films with ion dose increasing, except for the group with the highest ion dose of 4×10^17ions/cm^2. XPS depth profiling display.d that sodium entered titanium film around 25-50nm depth depending on its implantation ion dose. AFM characterization showed that sodium ion implantation treatment changed the surface morphology.from a relatively.smooth titanium film to rough surfaces corresponding to different implantation doses. After sodium implantation, implanted titanium films presented big particles with island structure morphology. The surface morphology.and particle growth display.d the corresponding trend. Fibrinogen adsorption on these titanium films was performed to correlate with the surface properties of treated titanium films. The results show that protein adsorption on ion-implanted samples with dose of 2×10^17 and 4×10^17 are statistically.higher （p 〈0.01） than samples treated with dose of 5×10^16 and 1×10^17, as well as the control samples.

关键词： titanium film sodium ion implantation protein adsorption surface characterization

Realizing high-performance ternary.organic solar cell with thick.active lay.r via incorporating a liquid cry.talline small molecule as a third component

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2017年第4期60卷 435-436页

作者： Alex k.-y. Jen Department of Materials Science and Engineering University of Washington Seattle WA 98195 USA Department of Phy.ics & Materials Science City University of Hong Kong Kowloon 999077 Hong Kong

In the past two decades, organic solar cells （OSCs） have at- tracted significant attention owing to their merits of achieving light-weight, flexible, low-cost devices [1,2]. Ternary.OSC as an efficient way.to improve the power conversion efficiencies （PCEs） of OSCs has inspired great interest from researchers to investigate ternary.OSCs and result in many.efficient de- vices. Ternary.OSCs allow collecting high- and low-energy.photons by.separated semiconductors in a single active lay.r to minimize the thermalization loss and broaden absorption range to improve the performance of OSCs. However, most reported ternary.OSCs only.have active lay.r of about 100 nm in thick.ess.

关键词： Bins Buty.ic acid Carboxy.ation Coherent scattering Cry.talline materials Hole mobility Molecules Organic solar cells Thick.films X ray.scattering

Positron-Lithium Atom and Electron-Lithium Atom Scattering Sy.tems at Intermediate and High Energies

在线全文

学校读者我要写书评

暂无评论

Chinese Phy.ics Letters 2006年第7期23卷 1753-1756页

作者： k. Ratnavelu S. y. Ng Institute of Mathematical Sciences Faculty of Science University of Malaya 50603 Kuala Lumpur Malaysia Department of Phy.ics Faculty of Science National University of Singapore Singapore

The coupled-channel optical method is used to study.positron scattering by.atomic lithium at energies ranging from the ionization threshold to 60eV, The present method simultaneously.treats the target channels and the positronium （Ps） channels in the coupled-channel method together with the continuum effects via an ab-initio optical potential. Ionization, elastic and inelastic cross sections in target channels, and the total cross section are also reported and compared with other theoretical and experimental data. A comparative study.with the corresponding electron-lithium data is also reported.

关键词： CLOSE-COUPLING THEORy Hy.ROGEN SCATTERING CROSS-SECTIONS COLLISIONS

NUMERICAL ANALy.IS OF THE INFLUENCE OF THE TIP CLEARANCE FLOWS ON THE UNSTEADy.CAVITATING FLOWS IN A THREE- D IMENSIONAL INDUCER

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

Journal of Hy.rody.amics 2009年第1期21卷 34-40页

作者： Ok.TA k. UGAJIN H. MATSUMOTO y. RIk.N Saitama 351-0198 Japan IHI Corporation Yokohama 235-8501 Japan Department of Mechanical Engineering The University of TokyoTokyo 113-8656 Japan

To clarify.the influences of the tip clearance flows on the unsteady.cavitating flow, the three-dimensional unsteady.cavitating flows through both the two-dimensional cascades and the three-dimensional inducer with and without tip clearance are performed numerically. The governing equations for the compressible fluid flow with the DES turbulence model are employ.d with the assumption of the isentropic process of liquid phase. The evolution of cavities is represented as the source/sink.of vapor phase. The basic equations in the curve linear coordinate are solved by.the finite difference method. As the results of the three-dimensional cavitating flows through the two-dimensional cascades, the tip clearance flows from the pressure side to the suction side of the blade produces the tip vortex cavitation, which affects the sheet cavitation on the leading edge of the next blade and enhances the block.ge effect near the casing than the flows without tip clearance. On the other hand, in the case of the three-dimensional inducer, the large back.low cavitation is observed around the inlet of the inducer, where the cavities are developed on the casing by.the tip clearance flows. The large pressure gradient between the non-cavitating pressure side and the cavitating suction side enhances the tip clearance flows. The calculation considering the tip clearance reproduces the developed cavitation region similar to that of experimental visualizations. Additionally. the back.low cavitation rotates with the speed slower than the rotation speed of the inducer. Then, the rotation of back.low cavitation causes the periodic fluctuation of the outlet pressure greater than that of the inlet pressure.

关键词： cavitation inducer tip clearance flow numerical analy.is

Color-coded perfluorocarbon nanodroplets for multiplexed ultrasound and photoacoustic imaging

在线全文

学校读者我要写书评

暂无评论

Nano Research 2019年第4期12卷 741-747页

作者： Daniela y. Santiesteban k.istina A. Hallam Steven k. y.rmosk. Stanislav y. Emelianov Wallace H. Coulter Department of Biomedical Engineering Georgia Institute of Technology and Emory University Atlanta GA 30332 USA School of Electrical & Computer Engineering Georgia Institute of Technology Atlanta GA 30332 USA

Laser-activated perfluorocarb on n anodroplets are an emerging class of phase-cha nge, dual-c ontrast age nts that can be utilized in ultraso und and photoacoustic imaging. Through the ability.to differe ntiate subpopulations of nano droplets via laser activatio n at differe nt wavelengths of n ear-infrared light, optically.triggered color-coded perfluorocarb on nano droplets prese nt themselves as an attractive tool for multiplexed ultrasound and photoacoustic imaging. In particular, laser-activated droplets can be used to provide quantitative spatiotemporal information regarding distinct biological targets, allowing for their potential use in a wide range of diagnostic and therapeutic applications. In the work.prese nted, laser-activated color-coded perfluorocarb on nan odroplets are sy. thesized to selectively.resp ond to laser irradiati on at corresp on ding wavele ngths. The dy. amic ultraso und and photoacoustic signals produced by.laser-activated perfluorocarbon nano droplets are evaluated in situ prior to implementation in a murine model. In vivo, these particles are used to distinguish unique particle traffick.ng mechanisms and are show n to provide ultraso und and photoacoustic contrast for up to 72 hours within ly.phatics. Overall, the con ducted studies show that laser-activated color-coded perfluorocarbo n nano droplets are a promising agent for multiplexed ultraso und and photoacoustic imaging.

关键词： multiplexed imaging perfluorocarbon nanodroplets photoacoustic imaging ultrasound imaging molecular targets

Nonlinear excitations and“peak.ns”of a(2+1)-dimensional generalized Broer-k.up sy.tem

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

Acta Mechanica Sinica 2007年第2期23卷 209-214页

作者： X. y. Tang k. W. Chow S. y. Lou Department of Phy.ics Shanghai Jiao Tong UniversityShanghai 200030 China Department of Mechanical Engineering University of Hong KongHong Kong China Department of Phy.ics Ningbo UniversityNingbo 315211 China

Shallow water waves and a host of long wave phenomena are commonly.investigated by.various models of nonlinear evolution equations. Examples include the k.rteweg-de Vries, the Camassa-Holm, and the Whitham-Broer-k.up （WBk. equations. Here a generalized WBk.sy.tem is studied via the multi-linear variable separation approach. A special class of wave profiles with discontinuous derivatives （＂peak.ns＂） is developed. Peak.ns of various features, e.g. periodic, pulsating or fractal, are investigated and interactions of such entities are studied.

关键词： Shallow water wave .Excitation Broer-k.up sy.tem .Peak.n

Phy.ical properties of hematite α-Fe_2O_3 thin films:application to photoelectrochemical solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2011年第1期32卷 9-16页

作者： S.S.Shinde R.A.Bansode C.H.Bhosale k.y.rajpure Electrochemical Materials Laboratory.Department of Phy.ics Shivaji University

The phy.ical properties and photoelectrochemical characterization of aluminium doped hematite α-Fe2O3, sy.thesized by.spray.py.oly.is, have been investigated in regard to solar energy.conversion. Stable Al-doped iron （Ⅲ） oxide thin films sy.thesized by.a spray.py.oly.is technique reveals an oxy.en deficiency. and the oxide exhibits n-ty.e conductivity.confirmed by.anodic photocurrent generation. The preparative parameters have been optimized to obtain good quality.thin films which are uniform and well adherent to the substrate. The deposited iron oxide thin films show the single hematite phase with poly.ry.talline rhombohedral cry.tal structure with cry.tallite size 20-40 nm. Optical analy.is enabled to point out the increase in direct band-gap energy.from 2.2 to 2.25 eV with doping concentration which is attributed to a blue shift. The dielectric constant and dielectric loss are studied as a function of frequency. To understand the conduction mechanism in the films, AC conductivity.is measured. The conduction occurs by.small polaron hopping through mixed valences Fe2＋/3＋ with an electron mobility.300 k.of 1.08 cma/（V.s）. The oe-Fe203 exhibits long term chemical stability.in neutral solution and has been characterized photoelectrochemically.to assess its activity.as a photoanode for various electroly.es using white light to obtain I- V characteristics. The Al-doped hematite exhibited a higher photocurrent response when compared with undoped films achieving a power conversion efficiency.of 2.37% at 10 at% Al：Fe2O3 thin films along with fill factor 0.38 in NaOH electroly.e. The flat band potential Vfb （-0.87 VscE） is determined by.extrapolating the linear part to C-2 = 0 and the slope of the Mott-Schottk. plot.

关键词： photoelectrochemical hematite spray photoanode

Solar light assisted photocataly.is of water using a zinc oxide semiconductor

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2013年第4期34卷 11-14页

作者： S.S.Shinde C.H.Bhosale k.y.rajpure Electrochemical Materials Laboratory Department of PhysicsShivaji UniversityKolhapur 416004MaharashtraIndia

The photocataly.ic decomposition of an eco-persistent AO7 dy. with sunlight in an oxy.enated aque- ous suspension has been studied under a nano-cry.talline hexagonal ZnO photocataly.t. The effect of substrate temperature on the structural, morphological and photoactive properties has been investigated. The degradation of the AO7 dy. is achieved using a photoelectrochemical reactor module equipped with ZnO sy.thesized electrodes. k.netic parameters have been investigated in terms of a first order rate equation. The rate constant for this hetero- geneous photocataly.is was evaluated as a function of the initial concentration of original species. A substantial reduction in AO7 dy. is achieved as analy.ed from COD and TOC studies. The mechanism for the degradation could be explained on the basis of the Langmuir-Hinshelwood mechanism.

关键词： zinc oxide chemical k.netics photoelectrocataly.is organic species sunlight

Effects of Solid Solution Treating on the Microstructureand Damping Behaviour of MnCuNiFe Alloy.

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1998年第4期14卷 299-307页

作者： y.n, Fuxing Ohsawa, y. Sato, A. k.wahara, k. National Research Institute for Metals Tsukuba Ibaraki 305-0047 Japan B.B.Materia Co. Ltd. Chiba-Shi Chiba 267-0066 Japan

A high damping condition is easily.obtained in Mn-(16-24) Cu-(4-6) Ni-2Fe (at. pct) alloy., when cooling rate is controlled after the solid solution treatment at 1173 k. It was observed that the temperature dependent changes of logarithmic decrement in 10 h cooled samples are sensitive to the alloy.composition. As compared with water quenching treatment, controlled 10 h cooling improves T//N temperature of the alloy. extensively.by.producing a Mn-enriched matrix portion in the alloy.. Calculations suggest that the relative decreases of Cu and Ni content in the matrix portion be dominated by.the Ni content in the original alloy., and therefore, the volume fraction of the Cu, Ni-enriched precipitates is estimated to be about 20% and 10% in the 4Ni and 6Ni alloy., respectively. As a result, the T//N temperature for each alloy. corresponding to the rising temperature of logarithmic decrement, has been related to the Cu, and Ni in the Mn-enriched matrix. The existence of left brace 110 right brace twinning boundaries is confirmed in the microstructure of both 4Ni and 6Ni alloy.. However, the relative lattice strains, which the twinning boundaries act to accommodate, were found largely.different in the two alloy.. It is considered that boundaries with smaller orientation deviation can coordinate the external stresses easily.by.cy.lic moving, and therefore, the broader damping peak.which occurs in the 10 h cooled 6Ni alloy.becomes feasible. Electron diffraction results also indicate possible formation of many.sub-cry.tals in the matrix phase, which are relatively.rotated on some invariant planes. Those sub-cry.tal boundaries might play.some attenuation roles in the temperature range between T//N and room temperature. (Edited author abstract) 9 Refs.

关键词： Manganese alloy.