Materials Literature
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The improvement of charge transport in conjugated polymers is a focal point of current research. It is shown here that the carrier mobility can be substantially increased through the introduction of conjugated cross-links between the conjugated chains. Novel organometallic polymer networks based on a poly(p-phenylene…
The crystallization behavior and crystal structure of polyamide 6/montmorillonite (PA6/MMT) nanocomposites were investigated by differential scanning calorimetry and X-ray diffraction, and an interesting behavior was observed. The material was prepared via melt compounding using an organophilic clay obtained by co-int…
Conformation of a single flexible polyelectrolyte molecule with a hydrophobic backbone in aqueous solution is effected by the interplay of the short-range intramolecular attraction and the long-range Coulomb repulsion. The conformation can be frozen if the molecule is trapped by a solid substrate. With this approach,…
We present a tight-binding model of single-wall carbon nanotubes with curvature-modified hopping parameter ${\ensuremath{\gamma}}_{i},$ from which an analytical relation of band gaps to both chirality and diameter is derived by developing a transfer matrix method. The results are in agreement with the experimental res…
Abstract Given the surface areas of three different species A, B, and C, what is the most likely contact area between A and B? This problem finds many applications, but it is of specific importance in solid‐phase reactions. Reactions in powder mixtures depend strongly on contact area between reactants, even when one s…
Higgins found that the slope and intercept of crystal size distribution (CSD) are automatically correlated with each other when the crystal content is constant, but he failed to make the necessary conclusion that even if the crystal content is not constant, the slope and intercept are still automatically correlated, a…
Among the biodegradable plastic specimens (poly-(3-hydroxy-butylate-valerate) (PHB / V), poly-(ε-caprolactone) (PCL), poly-(butylene succinate) (PBS), poly-(butylene succinate and adipate) (PBSA), and poly-lactide (PLA)) that were placed in soils for 1 year at nineteen sites in Japan, plastic specimens with appreciabl…
A method is presented for efficiency calculation and coincidence-summing correction of high-purity germanium (HPGe) detector spectra by using Monte Carlo N-particle transport (MCNP) code. This technique will be used in the efficiency calibration of HPGe detectors to reduce the number of standard sources to be prepared…
Development of solid dielectric dc transmission class cable has become a priority throughout much of the world. Interdiffusion between the semiconducting electrode materials and the dielectric inevitably causes variations in conductivity of the dielectric near the semicon which results in distortion of the electric fi…
The paper elucidates the methodsof estimating damping in ceramic matrix composites (CMC) with matrix cracks. Unidirectional composites with bridging matrix cracks and cross-ply laminates with tunneling cracks in transverse layers and bridging cracks in longitudinal layers are considered. It is shown that bridging matr…
An investigation of the gasoline permeation resistance of polyethylene (PE), polyethylene/modified polyamide (MPA), and polyethylene/blends of modified polyamide and ethylene vinyl alcohol (MPAEVOH) bottles is reported. The gasoline permeation resistance improves slightly after blending EVOH barrier resins in PE matri…
Stretching PET at a high strain rate above the glass transition temperature has a positive effect on the strength of the material. In a recent paper[1], we presented the influence of stretch and blow molding parameters on the properties of the final product, especially on the crystallinity induced by stretching. In th…
A 30-ft/s vertical drop test of a 10-ft-long fuselage section of a Boeing 737 (B737) aircraft was conducted in October of 1999 at the Federal Aviation Administration (FAA) William J. Hughes Technical Center, Atlantic City International Airport, NJ. This test was performed to evaluate the structural integrity of a conf…
Modeling of three-phase transformers with three-limb cores is important. Such units are very ubiquitous and are asymmetric due to the different lengths of the three limbs of the core. It is, therefore, important to devise a measuring procedure where the (λ-i) characteristics of the three limbs and the zero-sequence (λ…
Abstract A far cold remote nitrogen (FCRN) plasma, eventually doped with oxygen, was used to modify the surface properties of a polyethylene (PE) powder. The process associates both remote plasma and fluidized bed technologies. Two applications are described. The first one, for increasing the hydrophilic character of…
The crystal structures of the enzyme orotidine-5'-monophosphate decarboxylase from Methanobacterium thermoautotrophicum complexed with its product UMP and the inhibitors 6-hydroxyuridine 5'-phosphate (BMP), XMP, and CMP are reported. A mutant version of the protein, in which four residues of the flexible phosphate-bin…
Abstract Tris(8-hydroxyquinoline)aluminum (III) complexes (Alq 3 ), one of the molecules studied most widely for organic light-emitting devices, were formed in the interlayer spaces of smectites by solid-solid reactions between Al-smectites (Al-montmorillonite and Al-synthetic saponite (Sumecton)) and 8-hydroxyquinoli…
A new method has been standardized for extraction of polyhydroxy alkanoates from the bacteria, using sodium hypochlorite. This method is simple and quick as compared to the existing methods. Statistical analysis has proved the method to be reliable and reproducible.
Ceramic materials that are widely employed in dental prosthetics and repairs exhibit luminescent properties. Because of their use in the body, these materials are potentially of interest in situations where retrospective dosimetry for individuals is required but where monitoring was not planned. The luminescent proper…
Abstract X‐ray photoelectron spectroscopy measurements of commercial bulk MoO 2 revealed the presence of MoO 3 and Mo 2 O 5 phases in the sample surface region. In situ hydrogen reduction at different temperatures up to 650 K enabled to be reduced Mo 6+ and Mo 5+ to Mo 4+ . Bulk MoO 2 as prepared by hydrogen reduction…