Materials Literature
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The growing use of plastics and other flammable synthetic materials in construction, home furnishings, and various industrial applications is creating opportunities for polymer compatible, thermally stable, environmentally friendly, and cost-efficient flame retardants. New legislation emphasizing test methods that pro…
An exact relation between the bulk effective Seebeck coefficient alpha e of a composite conductor and the bulk effective electrical and thermal conductivities sigma e and gamma e is used to study the scaling behaviour of alpha e near percolation. The behaviour turns out to be quite rich, as a result of its dependence…
Copper is being considered as an alternative to aluminum-based metallizations in microelectronic circuits, both because copper is a better conductor and because it is expected to be more resistant to thermal stress and electromigration induced failure. However, thermal stresses are found to cause significant voiding i…
The dielectric constant ■ of thin epitaxial SrTiO3 films used as dielectric layers in high Tc superconducting field-effect devices has been studied. ■ in these thin films was found to have much weaker dependence on temperature and applied electric field than the bulk material. The breakdown characteristics of gate str…
The role of silicon hydride species in the photoluminescence intensity behavior of porous Si has been studied. The surfaces of luminescent porous Si samples were converted to a predominate SiH termination using a remote H plasma. The as-passivated samples were then immersed in various concentrations of hydrofluouric s…
Abstract The unusual reinforcement mechanism exhibited by silica in epoxidized natural rubber (ENR) may be attributed to the specific chemical interaction or the chemical cross‐linking taking place between silica and the epoxy groups while heating the mix. Evidence for the higher interaction is established through rhe…
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<div class="htmlview paragraph">At the 1990 Annual Aerospace/Airline Plating and Metal Finishing Forum, The Boeing Commercial Airplane Group presented information on boric acid/sulfuric acid anodizing (BSAA) as a replacement for chromic acid anodizing (CAA) to meet environmental regulations.</div> <div…
This study was undertaken to determine the cause of cracking in high hard armor steel plates used in the manufacture of light armored vehicles (LAVs) and to make recommendations to alleviate the problem. Cracks in several components from fielded vehicles were analyzed. In many cases the cracking was found to be caused…
In addition to the standard extended dislocation dipoles, we show that there are four additional stable defects with lozenge-shaped cross-sections. The relative stability of these various types of extended dipoles and faults in silver, a typical f.c.c. metal, is numerically evaluated. Isotropic linear elasticity is as…
In 1989, a 154 kV, 200 MVA gas-insulated power transformer was commissioned and has been operated with a satisfactory operating record. Utilizing this development experience and introducing new technology, a 275 kV, 300 MVA gas-insulated power transformer has been developed. The compact design of the main-gap insulati…
Na 2 HgS 2 and K 2 HgS 2 were obtained as colourless, tabular crystals by reacting the alkali sulfides Na 2 S and K 2 S with red HgS at 970 K. Both compounds are orthorhombic: Na 2 HgS 2 , oP40, s.g. Pbca with a = 18.24(2) Å, b = 7.494(5) Å, c = 7.237(5) Å, Z = 8; K 2 HgS 2 , oP20, s.g. Pbcm a = 10.697(6) Å, b = 7.958…
The structural phase transition in [N(CH3)4]2CdBr4 at 272 K has been studied by dielectric measurements. Dielectric constants along the three crystallographic axes show breaks at the transition temperature. The transition temperature increases linearly with increasing hydrostatic pressure at a rate of 0.174 K/MPa. Twi…
Several compositions were selected to investigate the formation of M phase. It was found that by reducing Fe 2 O 3 or increasing La 2 O 3 , we were able to obtain pure M phase, as deduced from X‐ray patterns, but CaO.2Fe 2 O 3 was always observed in micrographs of the polished surfaces. The instability of the M phases…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular dynamics simulations of poly(dialkylsiloxanes): conformational statistics and unperturbed chain dimensionsNeal Neuburger, Ivet Bahar, and Wayne L. MatticeCite this: Macromolecules 1992, 25, 9, 2447–2454Publication Date (Print):April 27, 1992Publication History Publ…
This study quantified the light intensity transmitted by the reflecting wedges perpendicularly to the growth axis. The results demonstrated that the cervical wedges did reflect the light of 180 degrees and original light intensity diminished by 83.9%. The maximal light intensity transmitted to the resin by the wedge w…
Abstract New polyurethane‐ graft ‐polystyrenes (4) of well‐defined structures and compositions were synthesized by macromonomer technique and the structure‐liquid‐crystalline (LC) property relationship is discussed. The expected graft copolymers with polystyrene grafts were prepared by melt polycondensation of a mixtu…
A nonlinear theory of transient patterns in the electrically induced splay Fr\'eedericksz transition in nematic liquid crystals is presented. Growth conditions for periodic perturbations with a wave vector perpendicular to the initial director alignment, superposed on the homogeneous realignment process, have ben inve…
Magnetic phase diagrams of three-sublattice perovskite-type antiferromagnets in the H-T plane are constructed. The behaviour of the magnetic susceptibility at the phase transition point is analyzed theoretically. The influence of the external field on the spectrum of spin waves is investigated in the vicinity of criti…
During the last 40 years PVC has become the most widely studied and understood polymeric biomaterial. The success of PVC compounds is due to their ability to fulfill the complex needs of the medical device industry. The range of properties they possess, which includes flexibility and low toxicity, is achieved by their…