Materials Literature
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We report on electroluminescence at room temperature from forward biased n+–p silicon diodes containing high densities (108–109 cm−2) of dislocations at the junction interface. In addition to electroluminescence from band-to-band transitions, we observe a signal with a comparable intensity peaked at ∼1.6 μm (0.78 eV).…
The region of parameter space (acoustic pressure ${P}_{a}$, bubble radius ${R}_{0}$) in which stable single bubble sonoluminescence (SBSL) occurs in an air-water system is a small fraction of that which is accessible. This is due to the existence of an island of dissolution at high ${P}_{a}$ and small ${R}_{0}$. For d…
High energy resolution inelastic x-ray scattering measurements in the $1--6{\mathrm{nm}}^{\ensuremath{-}1}$ momentum transfer ( $Q$) region in vitreous silica ( $v{\ensuremath{-}\mathrm{S}\mathrm{i}\mathrm{O}}_{2}$) at $T\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1050\mathrm{K}$ show the existence of collectiv…
Polycrystalline thin films of Ba(ZrxTi1−x)O3 with x=0–0.4 and a thickness of ∼180 nm were deposited on platinum-coated silicon substrates by rf magnetron sputtering at 500 °C. Ba-rich targets were used to prepare films of stoichiometric composition. The film having x=0.12 exhibited a satisfactory dielectric property o…
We collect and spectrally resolve photoluminescence from single CdSe nanocrystallite quantum dots. The elimination of spectral inhomogeneities reveals resolution limited spectral linewidths ( $<120\ensuremath{\mu}\mathrm{eV}$ at 10 K) more than 50 times narrower than expected from ensemble measurements. Light drive…
In this work, we investigate the suitability of models based solely on continuum hydrodynamics for Stokesian Dynamics simulations of sheared suspensions of non-Brownian hard spheres. The suspensions of interest consist of monolayers of uniform rigid spheres subjected to a linear shear field. Areal fractions ranged fro…
Copolymer resins were synthesized by the mixed condensation of resorcinol–CH2O, resorcinol–aniline–CH2O, resorcinol–aniline–thiourea–CH2O, and resorcinol–aniline–urea–thiourea–CH2O with a view to develop synthetic resins having improved properties and performance like toughness, mechanical properties, thermal resistan…
The reaction of Na[V -I (CO) 6 ]·2diglyme, V I (C 5 H 5 )(CO) 4, [Et 4 N][V -I (CO) 6 ], V o (C 5 H 5 )(C 7 H 7 ), V o (CO) 6, [V I (C 6 H 6 ) 2 ][PF 6 ], [V I- (C 6 H 6 ) 2 ][V -I (CO) 6 ], V II (C 5 H 5 ) 2, [V II (NCMe) 6 ][BPh 4 ] 2, [V II- (NCMe) 6 ]-[V -I (CO) 6 ] 2, and [V II (THF) 6 ][V I (CO) 6 ] 2, with tetr…
Some Fe(II)-l,2,4-triazole derivatives exhibit very abrupt thermally induced spin transitions around room temperature, accompanied by a well pronounced change of color, between purple in the low-spin (LS) state and white in the high-spin (HS) state. Our objective is to obtain such compounds for which the ambiant tempe…
Three microstructures of polypropylene (PP)/elastomer/filler hybrids were obtained by processing control and elastomer or PP surface modification: (a) filler and elastomer particles are dispersed in a PP matrix to form separate particles; (b) elastomer particles with a filler core are distributed in a PP matrix; or (c…
The shepherd Magnes in the ancient Greek province of Magnesia in Thessaly is attributed to be the first to note that some rocks stuck to the nails of his shoes and the tip of his staff as he minded his flock of sheep. These seemingly magical rocks called Magnes Lapis at the time were later known as lodestone (leading…
A series of polycaprolactone/4,4′-diphenylmethane diisocyanate/1,4-butanediol (PCL/MDI/BDO) segmented polyurethanes of different compositions was synthesized by solution polymerization. The molecular weight of PCL diols used was in the range of 1600–7000. The crystallinity and morphology of these polymers were studied…
Clay minerals serve as petrological markers that can he used to measure and interpret ongoing changes in River Nile sedimentation, now largely affected by anthropogenic influences. Closure in 1964 of the High Dam at Aswan, in particular, has entrained marked changes of clay mineral assemblages along the Nile in Egypt.…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
We report here a general solution of the double-exchange problem in the high-nuclearity mixed valence systems containing arbitrary number P of the electrons delocalized over the network of N (P&lt;N) localized spins. The developed approach is based on the successive (chainlike) spin-coupling scheme and takes full…
To determine the merits of the conjecture for a distinct phase of liquid water below 160 K, and of its computer simulation [Nature 380, 328 (1996)], the dielectric relaxation times of pure bulk water and pure water sequestered in the pores of various polymer matrices are examined. The new data combined with the litera…
We report results of numerical analyses on the surface (macroparticle) interactions in simple fluids. The singlet Ornstein–Zernike theories with hypernetted-chain closures are employed. With no (or very weak) attraction in the surface–fluid interaction uMS, both the interaction φMM and the force fMM between macroparti…
Physical properties of alloys are compared as computed from ``direct'' and ``inverse'' procedures. The direct procedure involves Monte Carlo simulations of a set of local density approximation (LDA)-derived pair and multibody interactions {ν_f}, generating short-range order (SRO), ground states, order- disorder transi…
The phonon dispersion relations and the elastic constants are evaluated for Wigner electron crystals near the critical coupling strength for melting in the fully quantal regime at zero temperature. The structures considered are the body-centred and face-centred cubic lattices in dimensionality D = 3 and the triangular…
The formation of stress-induced martensite in superelastic NiTi was studied by neutron diffraction during uniaxial compressive loading and unloading. The respective phase fractions were determined as a function of the applied stresses using a Rietveld refinement with a March–Dollase texture formulation. Before loading…