Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract The increase of transmission at discrete frequencies (bleaching bands) is observed in porous silicon platelets pumped by picosecond laser pulses. It is attributed to a saturation of optical transitions between the energy levels of electrons and holes spatially confined within quasi‐zero‐dimensional (quantum d…
Pitting potentials, , and protection potentials, , have been determined for α‐brass (33% Zn) using a cyclic polarization method. Increasing the F − concentration shifts the critical potential to more active values. The pitting potentials, , and protection potentials, , depend on the logarithmic concentration of F − io…
Several studies have suggested that grafts from membranous derived bone (e.g., calvarial grafts) retain their volume better than those from endochondral derived bone (e.g., iliac bone grafts). Increased osteogenesis in grafts of the former type has been offered as the explanation. However, simple volume measurements o…
High-brightness blue and green light-emitting diodes (LEDs) based on II–VI double heterostructures (DHs) have been successfully grown by molecular-beam epitaxy (MBE) on (100) ZnSe substrates. These LED structures consist of a 500–1000 Å thick active region of undoped blue-emitting Zn0.9Cd0.1Se/ZnSe multiple quantum we…
A double dislocation pole model is proposed for deformation twinning in f.c.c. lattice structures. Operation of the twinning source proposed occurs when the passing stress that poses a high energy barrier to the nucleation and growth of a twin is surmounted by thermal activation. Orowan stress barriers are also involv…
Abstract The linear viscoelastic behavior of commercial broad‐distribution polypropylenes is studied. The samples underwent different controlled peroxide degradation rates, so they exhibit different molecular distributions. The relaxation spectrum is obtained by assuming that it takes the shape of a Log‐Normal distrib…
Room-temperature green luminescence has been studied in laser-modified (darkened) CdS nanocrystals with the average radii a ranging above the exciton Bohr radius (from 3.3 nm to 100 nm). Under high picosecond-pulse excitation, the electron-hole plasma decay kinetics exhibited a decrease of lifetime with decreasing cry…
Abstract A description is given of the unit group for the two groups G = D 12 and G = D 8 × C 2 . In particular, it is shown that in both cases the bicyclic units generate a torsion-free normal complement. It follows that the Bass-cyclic units together with the bicyclic units generate a subgroup of finite index in for…
To examine the effects of triploidy on rainbow trout myogenesis in vitro , mononuclear cells were liberated enzymatically from the lateralis muscles of diploid and triploid trout. The muscle of diploids yielded 1 × 10 6 ± 1 × 10 5 (± s.e.m. ) mononuclear cells g −1 muscle compared to 0.7 × 10 6 ± 8 × 10 4 cells g −1 f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology of n-type macroporous silicon: doping density dependenceE. Galun, C. Reuben, S. Matlis, R. Tenne, and C. Levy-ClementCite this: J. Phys. Chem. 1995, 99, 12, 4132–4140Publication Date (Print):March 1, 1995Publication History Published online1 May 2002Published inis…
Within this work we present Brillouin and ultrasonic investigations performed on the liquid crystals p-methoxybenzylidene p-(n-butylaniline) (MBBA), p-azoxyanisol (PAA), 4-cyano-4-n-alkylbiphenyles (nCB), and 4-n-pentoxybenzylidene-4'-n-octoaniline (5O.8). Special attention has been paid to the evolution of a signific…
Abstract— Corrosion fatigue crack growth rates in high strength steel are often increased when a large cathodic polarization is applied. The corrosion fatigue mechanism in this case is generally considered to be due to hydrogen embrittlement. In the present study the crack growth process was carefully monitored by tak…
The origin of cyclic fatigue in two Ce‐TZP/Al 2 O 3 composites was investigated by (a) measurements of residual stresses in the transformation zones and crack‐tip stress intensities in in situ loaded compact specimens using microprobe Raman spectroscopy, (b) examination of the crack‐tip transformation zones by transmi…
Abstract The processing behavior and morphology are investigated for nonreactive and reactive nylon/ethylene-propylene rubber blends. The nylon (PA) is a partially aromatic amorphous nylon with amine termination. The rubbery phases are an ethylene-propylene rubber (EP) and a similar ethylene-propylene rubber (EP-MA) w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyisoimides: Synthesis and Evaluation as Efficient Precursors for PolyimidesKeisuke Kurita, Yukiko Suzuki, Takahito Enari, Shigeru Ishii, and Shin-Ichiro NishimuraCite this: Macromolecules 1995, 28, 6, 1801–1806Publication Date (Print):March 1, 1995Publication History Publ…
The rare earth gadolinium (Gd) is used in modern industry. Solubilized DTPA Gd and DOTA Gd complexes are used as contrast media in nuclear magnetic resonance imaging. In order to determine the subcellular localization of Gd, rats were injected intraperitoneally with Gd nitrate. Two microanalytic methods, ion microanal…
Six compositions of Cu-Ni-Sn alloys in the α and (α+θ) phase containing 2.7 to 13 wt% Sn and 5 to 22 wt% Ni have been prepared for structure-property correlation by X-ray diffraction, optical and scanning electron microscopy, microhardness and ageing studies. X-ray diffraction line profile analysis characterizes the p…
Abstract The effect of Ethylene Methyl Acrylate (EMA) copolymer as a reactive polymeric compatibilizer in a blend of 50:50 Thermoplastic Polyurethane (TPU)‐Polydimethylsiloxane (PDMS) rubber has been studied. The compatibility was proved by mechanical property measurements and phase morphology studies. EMA reacted wit…
Modeling of kinoforms in optical design software packages can be done in terms of the phase function ϕ(r). The required surface-relief profile t(r) is determined approximately from the relation t(r) = [λ/2π(μ − 1)][ϕ(r)]2π, where λ is the operating wavelength, μ is the refractive index of the optical material of the s…
The hydrogen sites in the disordered metal hydrides, \ensuremath{\beta}-${\mathrm{Ti}}_{1\mathrm{\ensuremath{-}}\mathit{y}}$${\mathrm{V}}_{\mathit{y}}$${\mathrm{H}}_{\mathit{x}}$ (x\ensuremath{\sim}1 and 0.2\ensuremath{\le}y\ensuremath{\le}0.9) were studied using the incoherent inelastic neutron scattering (IINS) tech…