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。
Continuous surface-relief diffractive optical elements for two-dimensional array generation (fan-out) are designed and fabricated. Separable and nonseparable solutions for the two-dimensional element design are compared. The phase-grating microstructures are generated by laser-beam writing lithography in a single expo…
Oriented In2O3 films have been grown on (001) InAs, MgO, and YSZ substrates using pulsed laser deposition. The films in each case displayed a cube-on-cube orientation relation with respect to the substrate, as determined by in situ RHEED analysis and x-ray θ–2θ measurements. X-ray rocking curve full width at half-maxi…
An equilibrium uniaxial dodecagonal quasicrystal is reported to be formed by a freezing simple monatomic liquid in a molecular dynamics simulation. Its diffraction pattern closely resembles that of the dodecagonal quasicrystalline phase formed in ${\mathrm{V}}_{3}$${\mathrm{Ni}}_{2}$ and ${\mathrm{V}}_{15}$${\mathrm{N…
A novel thoretical treatment of antireflection-structured surfaces possessing general one-dimensional continuous profiles is presented. Closed-form solutions for the field reflection coefficients of these antireflection-structured surfaces are obtained through the use of effective medium theory and tapered transmissio…
Abstract A review of theoretical equations of state for polymer liquids is presented. Characteristic parameters for six equations of state, as well as parameters for the empirical Tait equation, are given for 56 polymers where pressure–volume–temperature (PVT) data over a wide range of conditions could be found in the…
The guided-mode resonance properties of planar dielectric waveguide gratings are presented and explained. It is shown that these structures function as filters that produce complete exchange of energy between forward- and backward-propagating diffracted waves with smooth line shapes and arbitrarily narrow filter linew…
Abstract The impetus for this work stems from the need to predict the field performance of a class of heavy oil reservoirs described as "foamy oil" reservoirs. Foamy oil reservoirs exhibit better than expected primary performance. Foamy oil reservoirs deliver greater primary recovery with less reservoir pressure decli…
The fabrication of improved ceramic-matrix composites will require a better understanding of processing variables and how they control the development of the composite microstructure. Noninvasive, high-resolution methods of x-ray tomography have been used to measure the growth of silicon carbide in a woven Nicalon-fib…
Rubber-toughened poly(methyl methacrylate) (RTPMMA) materials were prepared by blending PMMA with multiple-phase toughening particles with radially alternating rubbery and glassy layers. The effects of particle morphology and rubbery-phase volume fraction on the tensile and fracture properties were evaluated. The prin…
The production of H 2 and CO by catalytic partial oxidation of CH 4 in air and O 2 at atmospheric pressure has been examined over Pt- and Rh-coated monoliths at residence times of less than 10 -2 sec, with a Rh-coated foam monolith giving H 2 and CO selectivities as high as 0.90 and 0.96 respectively. Studies of sever…
Abstract Reactive extrusion is the term used to denote a plastics processing method in which an extruder is used as a reactor for the continuous synthesis and modification of polymers. This paper describes the manufacture of polystyrene and styrene‐isoprene copolymers by a reactive extrusion process: anionic “living”…
A toughened thermoset generally contains elastic or thermoplastic domains dispersed in discrete form throughout the matrix resin to increase the resistance to crack-growth initiation. Fracture behavior is governed by characteristics of viscoelasticity, shear yielding, and dilatational deformation involving cavitation.…
The adsorption and reaction of CO, CO 2, NO 2, H 2 O, CH 3 OH, and C 2 H 4 were studied on clean and oxygen-precovered Au(111) surfaces. High coverages of oxygen adatoms, Θ O, up to one monolayer were formed under clean, UHV conditions by exposure of Au(111) to ozone. Neither CO nor CO 2 adsorbed on clean or oxygen-pr…
The effects of oxygen co-doping in ZnS:TmF3 and ZnS:Tm, Li thin-film electroluminescent devices are reported. Active layers are deposited in oxygen atmosphere at substrate temperatures of 200 and 300 °C. It is found that by oxygen codoping the luminance of ZnS:TmF3 and ZnS:Tm, Li devices increases, and that this pheno…
A phenomenological description of the dynamical correlations in a fluid confined between two parallel solid walls, using a generalization of Onsager's theory of fluctuations, is presented. Besides the bulk viscosity, this description involves parameters characterizing the boundary conditions. Correlations functions ob…
Here we study the interplay between wetting and phase separation for a nearly symmetric binary mixture confined in a one-dimensional (1D) or a two-dimensional (2D) capillary. It is found that near the symmetric composition, the hydrodynamics unique to bicontinuous phase separation plays a crucial role in the wetting d…
The structural properties and the phase transition between the B1 (rock salt) and B2 (CsCl) phases of NaCl have been investigated at an ab initio level. Total energy curves, obtained with periodic Hartree-Fock (HF) calculations, have been corrected a posteriori by integrating the HF charge density according to the cor…
Coherent intermediate scattering functions are measured by dynamic light scattering for several wave vectors around the structure factor peak on metastable colloidal fluids and glasses of hard spherical particles. The results are quantitatively described by a combination of the \ensuremath{\alpha} and \ensuremath{\bet…
Long-lived phosphorescence and thermoluminescence (TL) from UV-irradiated SrO powders under high vacuum are observed at low temperature. Phosphorescence decays following a t -1 law below 160 K in the time range 10-103 s. The emission spectra of phosphorescence and TL have a peak at 2.7 eV. The luminescence is quenched…
Abstract The application of photosensitive polyimides in electrical and optical interconnection technology is discussed. Critical properties of two photosensitive polyimide formulations with significantly different structural chemistries have been compared. Polyamic ester based formulations such as Selectilux® HTR3 sh…