Materials Literature
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This work characterizes influence of moisture absorption on damping of tennis rackets. Three thermoset and one thermoplastic matrix composites were used for making the rackets. The first is a carbon/epoxy system, and the second is similar except that the epoxy is a polyurethane-modified type. The third is an interleav…
Ba(Ti1-xZrx)O3 (x = 0.15 and 0.2) single crystal fibers were grown by the laser heated pedestal growth (LHPG) technique. The XRD results show that the grown crystals are of single phase. Temperature dependence of dielectric permittivity, room temperature hysteresis loops and strain were measured. A broad permittivity…
Transmission electron diffraction patterns from ultra-thin aromatic and aliphatic organic films at beam energies of 200 eV-1 keV have been recorded in a custom low energy electron transmission (LEET) chamber. A significant reduction of the molecular damage cross-section, measured by fading of diffraction spots, was fo…
Die Entwicklung von Kunststoffen hat der Welt äußerst haltbare und vielfältig einsetzbare Materialien geliefert. Durch die rasante Anwendung ,besonders als Einwegverpackungen,sind Kunststoffe jedoch längst zu einem Müllproblem geworden. Neue Polymere,die gezielt durch Mikroorganismen abgebaut werden können,sollen helf…
An accurate analysis of short circuit electromagnetic forces in a three-phase enclosure-type gas insulated bus (GIB) has been performed. The analysis clarified the effects of the eddy currents (skin effect) and the nonlinear permeability on the materials. The calculated magnetic fields agree with the measured fields.…
Localized corrosion, such as pitting and crevice/underdeposit corrosion, is responsible for the majority of plant equipment corrosion failures. However, the assessment of localized corrosion in plant operating conditions is often overlooked, partly because none of the techniques commonly used today can provide realist…
There is currently great interest in the use of lyotropic liquid crystals as templates for the production of mesoporous inorganic or metallic materials having uniform pore sizes in the range 20-100 Å or greater. Such materials have potential applications as catalysts, molecular sieves or electrodes, and can accommodat…
We describe a distinct nematic liquid crystal with ferroelectric ordering which is formed from the polar rod-like aromatic polyester. The nematic liquid crystal is biaxial and the polarity appears along both axes as determined by measurements of the second harmonic generation. The strong dipole-dipole interaction betw…
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…