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It is shown that for relatively more stable metallic clusters (those with magic number of atoms) the chemical hardness (I-A) too is relatively larger. Thus the occurrence of magic numbers for metal clusters whose stability is determined by their electronic shell structure can be understood as a manifestation of the pr…
Dielectric relaxation was previously reported in ${\mathrm{BaTiO}}_{3}$ and ${\mathrm{BaTiO}}_{3}$:Fe single crystals at radio frequencies [M. Maglione et al., Phys. Rev. B 40, 11 441 (1989)]. We have measured the dielectric dispersion in four ${\mathrm{BaTiO}}_{3}$:Nb samples (${\mathit{x}}_{\mathrm{Nb}}$0.3 at. %) a…
Hydrophobically-modified, water-soluble polyelectrolytes have been prepared by a micellar technique from acrylamide, n-decylacrylamide, and a third monomer, sodium 3-acrylamido-3-methylbutanoate, sodium acrylate, or sodium 2-acrylamido-2-methylpropanesulfonate. These terpolymers exhibit rheological behavior dependent…
Abstract FTIR studies of six partially-deuterated montmorillonites (MS) reveal the presence of two O-D stretching bands, one between 2702–2728 cm -1 and another near 2680 cm -1 . For homoionic (Li, Na, Mg, Ca, or La) Wyoming-type MS, the position of the higher frequency band, designated as (O-D) h , is between 2714–27…
A transient technique is used to measure the effective thermal conductivity of textile fabrics containing varying amounts of water. Conductivity increases with water content and also depends on a fiber's sorption properties. Wool, which is a highly absorbent fiber, has better insulating properties under moist conditio…
When the yarn sett of a woven fabric is systematically increased, there is also a systematic increase in the frictional resistance to motion, and it is greater for weft-over-weft motion than for warp-over-warp. The greater warp crimp producing a “knuckle effect” could be the explanation, although the diminishing space…
Abstract Novel liquid crystalline materials having angular structures with mesogens pointing in two directions have been prepared by complexation of phthalic or isophthalic acid and two molecules of a stilbazole through intermolecular hydrogen bonding.
Antiferroelectric (AFE)-ferroelectric phase transformations in tin-modified lead zirconate titanate, i.e., Pb(Zr,Sn,Ti)O3 are reported. A martensitic-type approach is developed to explain the observed thermal hysteresis and field-induced transformation behavior. A model is proposed with transformation fields where the…
Structural development of tellurite glasses with the addition of Li 2 O and Na 2 O has been studied using infrared, Raman, and X‐ray photoelectron spectroscopies. The increase in intensity of the peak at 755 cm −1 in the infrared spectra as compared to the peak at 620 cm −1 suggests the transformation of TeO 4 buildin…
The heat transfer rates of natural convection of molten gallium were measured under various strengths of heating rates and three coordinate directional magnetic fields. Molten gallium (Pr = 0.024) was filled in a cubic enclosure of 30 mm × 30 mm × 30 mm whose one vertical wall was uniformly heated and an opposing wall…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrokinetic analysis of diverse experimental data for ethylene hydrogenation on platinumJames E. Rekoske, Randy D. Cortright, Scott A. Goddard, Sanjay B. Sharma, and J. A. DumesicCite this: J. Phys. Chem. 1992, 96, 4, 1880–1888Publication Date (Print):February 1, 1992Public…
In situ Raman spectroscopy measurements were made during the anodic oxidation of copper in 1 M and 6 M KOH solutions. The formation of CU 2 O occurs at potentials corresponding to the first anodic voltammetric peak (A1), and a porous layer of Cu ( OH ) 2 composed of fine needle‐like crystals is formed at the second vo…
Abstract Monodisperse porous polymer particles in the size range of 10 μm in diameter were prepared via seeded emulsion polymerization. Linear polymer (polystyrene seed) or a mixture of linear polymer and solvent or nonsolvent were used as inert diluents. The pore diameters of these porous polymer particles were on th…
Stress-strain trajectories associated with pseudoelastic behavior of a Cu-19.4 Zn-13.1 Al (at. %) single crystal at room temperature have been determined experimentally. For a constant cross-head speed the trajectories and the associated hysteresis behavior are perfectly reproducible; the trajectories exhibit memory p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe hydrosodalite system Na6+x[SiAlO4]6(OH)x.cntdot.nH2O: formation, phase composition, and de- and rehydration studied by 1H, 23Na, and 29Si MAS-NMR spectroscopy in tandem with thermal analysis, x-ray diffraction, and IR spectroscopyGuenter Engelhardt, Juergen Felsche, and…
The photoisomerization of disperse red 1 (DR1) in polymethylmethacrylate thin films is demonstrated by monitoring the refractive index variations by the attenuated total reflection method. Absorption spectrum measurements give a confirmation of this phenomenon. The kinetics of photoisomerization and of thermal relaxat…
We have carried out Brillouin-scattering experiments on vitreous silica at temperatures between 50 and 300 K and pressures up to 3 GPa. Application of pressure leads to considerable changes of the acoustic absorption and the velocity of sound. In order to explain our observations, we start from the so-called ``tunneli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIpso nitration of p-tert-butylcalix[4]arenesWillem Verboom, Alex Durie, Richard J. M. Egberink, Zouhair Asfari, and David N. ReinhoudtCite this: J. Org. Chem. 1992, 57, 4, 1313–1316Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Publish…
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1. Introduction. 2. Stress and Strain in Cyclic Loading. Monotonic stress-strain curve. Stress-strain relationship in cyclic loading. Hysteresis loop. Cyclic hardening/softening curves. Cyclic stress-strain curve. 3. Cyclic Plasticity and Microstructure. Metals and simple alloys with f.c.c. structure. Metals and singl…