Materials Literature
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The thermal dependences of the principal refractive indices of lithium triborate (LBO) have been measured over an extended temperature range of 20–200 °C with a Michelson interferometer. The data obtained are critically evaluated by prediction of the temperature dependences of phase matching and the temperature bandwi…
Radiation quantities and units assessment of doses from natural and man-made sources instrumentation in dosimetry and radiation protection methods of evaluation and measurement of basic dosimetry and radiation protection quantities.
We investigate the porosity dependence of the ferroelectric domain density and the internal stress of fine-grained (∼1 µ m) BaTiO 3 ceramics using transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The ferroelectric domain density and the internal stress exerted by the neighboring grains of the fin…
Abstract Low viscosity polyalphaolefin fluids (2 and 4 cSt ® 100°C) are significantly biodegraded under the conditions of the CEC‐L‐33‐T‐82 test procedure. This is contrary to the widespread, but inaccurate, perception that polyalphaolefin (PAO)fluids are generally not biodegradable. In a time‐extended CEC‐L‐33‐T‐82 t…
Blends of cellulose acetate (2.5 degree of substitution) and starch were melt processed and evaluated for mechanical properties, biodegradability during composting, and marine and soil toxicity. Formulations containing, on a weight basis, 57% cellulose acetate (CA), 25% corn starch (St) and 19% propylene glycol (PG) h…
Abstract A variety of esters from the reactions of monoalcohols with palm olein were prepared, epoxidized by in situ peroxyacid techniques, and some of their physical properties were compared. The thermal oxidative stabilities of these esters and bis (2‐ethylhexyl) phthalate were studied. The esters were placed in an…
A method for studying adsorption and desorption processes of impurity ions in nematic liquid crystal cells is proposed. The experimental results for 4-cyano-4‘-pentyl biphenyl are interpreted in terms of a rate-equation approach and the time constants for the adsorption and desorption processes of the ions are determi…
Orthorhombic (O1, O2 and O3) and monoclinic (M1 and M2) phases are the crystalline approximants of the Al–Cu–Fe–Cr decagonal quasicrystal. The structures of these crystalline phases can be described using three subunits, which are derived from the O3 structure. As an example, the structural model of the O1 phase is pr…
The enzymatic degradation of films of synthetic poly[(R,S)-β-hydroxybutyrate], PHB, of various tacticities was investigated by weight loss measurement. Extracellular PHB depolymerases of the bacterium Pseudomonas lemoignei and the fungus Aspergillus fumigatus M2A were used. In both enzyme systems the nearly atactic sa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Propylene Carbonate Acrylate and Poly(propylene carbonate acrylate) Electrolyte Elastomer Gels. 13C NMR Evidence for Li+-Cyclic Carbonate InteractionJosh H. Golden, Benjamin G. M. Chew, David B. Zax, Francis J. DiSalvo, Jean M. J. Frechet, and Jean-Marie Taras…
Dielectric, ferroelectric and electric field-induced strain properties of (Pb1-xBax)(Zr1-yTiy)O3 ceramics with 0.15 ≤ x ≤ 0.45 and 0.16 ≤ y ≥ 0.70 were investigated. A wide range of compositions possessing relaxor phase characteristics was found to exist near the boundaries between the ferroelectric rhombohedral, tetr…
Polyaniline (PAn) thin films were prepared from aniline solutions in by scanning the potential cyclically between −0.2 and 0.8 V ( vs. SCE). Films of different thicknesses, and hence different intrinsic oxidation states, reacted differently with . While redox reactions leading to the deposition of silver metal occurre…
Theoretical models relative to Raman scattering in disordered solids are discussed and compared with the available experimental evidence. In particular, experimental data relative to the Boson peak integrated intensity and computer simulations on three-dimensional site percolators, allow us to infer that the relevant…
The second peak in the structure factor of ${\mathit{AX}}_{2}$-type glasses is found to behave in an anomalous fashion with respect to network-modifier content in a manner similar to that characteristic of the first sharp diffraction peak (FSDP). The structural origin of this newly identified second sharp diffraction…
Abstract Photochromic polyurethane films containing 5-substituted 1,3-dihydro-3,3-dimethyl-1-alkylspiro[2H-indole-2,3′-[3H]pyrido[3,2-f][1,4]benzoxazine] and 1,3-dihydro-1,3,3-trimethylspiro[2H-indole-2,3′-[3H]naphth[2,1-b][1,4]oxazine] were degraded under xenon light exposure. The loss of the photochromic response wa…
We have studied, through time-resolved degenerate-four-wave mixing, the nonlinear response below the band gap of glasses doped with CdTe and CdS1−xSex nanocrystals by using 30-ps pulses from a Nd:YAG laser in the intensity range 0.4 – 1.6 GW/cm2. We found that the third-order nonlinearity is overshadowed by a fifth-or…
We present measurements of the thermal-expansion coefficient \ensuremath{\alpha}(T) on ${\mathrm{Fe}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Mn}}_{\mathit{x}}$ alloys with 15x60 at. % in the temperature range 4T1150 K. The results show that \ensuremath{\alpha}(T) is anomalously enhanced especially in the hig…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Solid-State Diastereomer, AgLa3GeS7Shiou-Jyh Hwu, Cordelia K. Bucher, James D. Carpenter, and Stephen P. TaylorCite this: Inorg. Chem. 1995, 34, 8, 1979–1980Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural Variations in Layered Alkali Metal NaphthalenesulfonatesBrian J. Gunderman and Philip J. SquattritoCite this: Inorg. Chem. 1995, 34, 9, 2399–2406Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995https…
The γ-phase of the MC2 Ni-based superalloy has been characterized using both in situ experiments and post-mortem observations (bright field and weak beam) in transmission electron microscopes. A mean value of the stacking-fault energy (about 31 mJ m−2) has been obtained through the measurement of dissociated nodes and…