Materials Literature
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Nonlinear optical measurements are performed with a ferrolyotropic calamitic nematic mesophase with different relative concentrations of the mixture compounds. The frontiers of the nematic domain are determined using optical microscopy and x-ray scattering techniques. The thermal lens model is used to obtain the therm…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Molecular dynamics simulations are used to obtain detailed information on defect production and disordering produced in the primary cascade state of radiation damage in Ni3Al as a function of irradiation temperature Tirr, Although the number of Frenkel pairs decreases with increasing Tirr, the size of interstitial clu…
This study analyzes pyrolytic gases generated at various temperature ranges to observe changes in gas generation behavior dynamically in the process of thermal degradation. Cotton cellulose, a most flammable sample, is treated with compounds containing nitrogen and/or phosphorus as well as halogens with and without ni…
The secondary electron emission of dielectrics usually is measured by the pulse method, in which the dielectric is irradiated with short pulses of electrons. Attempts to use a dynamic method, in which the dielectric is irradiated continuously, have failed because the dielectric becomes charged and this charge interfer…
Four poly(oxymethyleneanthrylene)s were prepared by polycondensation of 9,10-diacetoxyanthracene (and a substituted analogue) with α,ω-dibromoalkanes. Two model compounds were also synthesized by the same procedure. Although non-conjugated the polymers could be doped with iodine. The redox reaction of doping was confi…
Silicon nitride–silicon carbide (Si 3 N 4 –SiC) nanocomposites were fabricated by a process involving reaction bonding followed by superplastic sinter‐forging. The nanocomposites exhibited an anisotropic microstructure, in which rod‐shaped, micrometer‐sized Si 3 N 4 grains tended to align with their long axes along th…
Flux and iron loss distributions of three-phase reactor are analyzed using the finite element method considering 2-D B-H curves and iron losses in arbitrary directions which are measured up to high flux density. It is shown that the total iron loss of reactor yoke does not change so much by the yoke dimension, althoug…
A recently developed method for fitting a Monte Carlo computer simulation model to observed single-crystal diffuse X-ray scattering has been applied to (h0l) scattering data obtained for the disordered compound p-methyl-N-(p-chlorobenzylidene)aniline, C14H12ClN (ClMe), at 295 K. Each molecular site is occupied by a mo…
Electron beam interactions with specimens in the scanning electron microscope (SEM) can lead to increased surface temperatures and damage. These changes may have significant consequences in the analysis of bone tissue. An investigation was performed to measure the surface temperature changes associated with the electr…
Although titanium alloys have been widely used for aerospace applications, they have seldom been used in armor systems. In an effort to provide increased information to armored vehicle designers, the U.S. Army Research Laboratory (ARL) and the U.S. Department of Energy's Albany Research Center (ARC) performed a joint…
Transparent blend films were prepared from poly(vinyl alcohol) (PVA) and polysarcosine (PSA), i. e. poly(N-methylglycine). Miscibility between PVA and PSA was investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and scanning electron microscopy (SEM). It was revealed that PVA is…
We theoretically analyze the performance of optical thin-metal-clad waveguide polarizers with emphasis on the effect of dielectric-cover-layer (i.e., superstrate) thickness. We show that the polarization extinction ratio can be theoretically made infinite by selection of metal film thickness and polarizer length for a…
A critical review of former investigations on the cationically induced oligomerization of N -vinylformamide points out that some of the results are not in agreement with the model of an cationic propagation mechanism. Special attention in the discussion of the results is given on the chain structure of the oligo( N -v…
Most studies about lime requirement and the pH buffering capacity of soil have either calibrated buffer solutions to soil-CaCO3 reactions or have correlated pH buffering with soil properties such as clay and organic matter content. A different approach is to address two fundamental questions: where do OH− ions react w…
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The microstructural changes that occur during hot deformation of Ti-6A1-4V alloy with β transformed (βt) and equiaxed α+β ((α+β)e) starting microstructures have been modeled in the temperature range 750-1100°C and strain rate range 0.0003-10 s-1. The stress-strain behavior, the kinetic parameters, and the processing m…
E-Z photoisomerizable chiral dopants are a class of materials that can be used to prepare birefringent optical components with patterned optical properties. Two new photoisomerizable chiral dopants have been synthesized and analysed. The materials were derived from nopinone and camphor. The properties of these compoun…
Europium doped Al2O3 photoluminescent coatings have been prepared by an ultrasonic spray pyrolysis process, using a solution of 0.05M of AlCl3 · 6H2O as starting material and EuCl3 as doping. These films were deposited on Pyrex glass substrates at atmospheric pressure using purified air as a carrier gas. All films wer…
We show that the transition temperature ${T}_{c}$ of Nb-doped strontium titanate thin films grown in vacuum by pulsed laser deposition is similar to bulk and that these films follow a similar dependence of ${T}_{c}$ on the carrier density as bulk. We have measured the temperature dependence of the upper critical field…