Materials Literature
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Abstract “Modifications” of carbon—as long as they predominantly have the layered graphite structure—exhibit the following properties: (1) electrical conductance, (2) the ability to accomodate ions or molecules between the layers of the lattice, and (3) the ability to react via functional groups at their surfaces (lar…
Ion-exclusion high-pressure liquid chromatography (HPLC) was used to measure poly-beta-hydroxybutyrate (PHB) in Rhizobium japonicum bacteroids. The products in the acid digest of PHB-containing material were fractionated by HPLC on Aminex HPX-87H ion-exclusion resin for organic acid analysis. Crotonic acid formed from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructure of ionomers: interpretation of small-angle x-ray scattering dataDavid J. Yarusso and Stuart L. CooperCite this: Macromolecules 1983, 16, 12, 1871–1880Publication Date (Print):December 1, 1983Publication History Published online1 May 2002Published inissue 1 Dec…
It is common knowledge that relatively small drops or bubbles have a tendency to stick to the surfaces of solids. Two specific problems are investigated: the shape of the largest drop or bubble that can remain attached to an inclined solid surface; and the shape and speed at which it moves along the surface when these…
Significant progress has been made during the past decade in incorporating micromechanics in continuum descriptions of inelastic deformation. This has led to the development of a rather comprehensive constitutive theory for rate-dependent and idealized rate-independent crystalline materials that deform plastically by…
The effect of pressure on Raman spectra of solid chlorine has been measured up to 45 GPa using a diamond anvil cell. The six Raman-active modes could be observed in first-order Stokes and anti-Stokes spectra at room temperature. The accidental degeneracy of the B 3g and A g lattice modes is lifted under pressure.
Proteins which bind guanine nucleotides are found in a diverse set of key regulatory positions. They are involved in hormone action, visual transduction, protein synthesis and microtubule assembly. In addition to their ability to bind guanine nucleotides these proteins possess several other common features. (i) They a…
Gadolinium chloride (GdCl3) was studied as a contrast agent for nuclear magnetic resonance. This rare-earth element dramatically alters proton resonance (paramagnetic moment = 10.8 Bohr magnetons). Acute toxicity was determined by intravenous injections in mice; mean lethal dose was 100-200 mg of GdCl3 . 6 H2O/kg. Cha…
Abstract Die Lebensdauer der Metall‐zu‐Ligand‐CT‐Übertragung des angeregten Zustandes der Titelverbindung und die Emissionsenergie werden in verschiedenen Lösungsmitteln (CH,CI" Butyronitril, Pyridin, Propylencarbonat, DMF, H 2 O) und bei verschiedenen Temp. gemessen.
The cation $3s$ levels in fluorides of $3d$ transition elements have been systematically examined with use of x-ray photoelectron spectroscopy. It is shown that $3s$ line shapes are determined by the $3d$ populations (and consequent exchange splittings) associated with different core-hole screening conditions. The scr…
A new class of semiconductor superlattice materials consisting of alternating layers 8-1200-\AA{} thick has been synthesized from semiconductors such as $a\ensuremath{-}\mathrm{Si}:\mathrm{H}$, $a\ensuremath{-}\mathrm{Ge}:\mathrm{H}$, $a\ensuremath{-}\mathrm{Si}{\mathrm{N}}_{x}:\mathrm{H}$, and $a\ensuremath{-}{\mathr…
Received 3 October 1983DOI:https://doi.org/10.1103/PhysRevLett.51.2020©1983 American Physical Society
A phenomenological model of dendritic solidification incorporating interfacial kinetics, crystalline anisotropy, and a local approximation for the dynamics of the thermal diffusion field is proposed. The preliminary results are in qualitative agreement with natural dendritelike pattern formation.
Self-diffusion in tellurium single crystals has been measured over the temperature range 496-640K using 127m Te as radiotracer and a sputtering technique for serial sectioning. Diffusion parallel to the c axis is described by D/sub /// T =6*10 -5 exp(-1.53 eV/kT) m 2 s -1 and perpendicular to the c axis by D perpendic…
The variation with composition of the electronic structure of polycrystalline sodium tungsten bronzes Na x WO 3 (0<x<1) has been studied using a combination of high-resolution electron spectroscopic techniques. Samples on either side of the metal-nonmetal transition (x approximately 0.25 from conductivity data)…
For pt.I see ibid., vol.16, p.6129 (1983). Proton second moment, T 1 H .T 1 rho H and T 1 11B measurements over the temperature range 330K>T>46K are reported. At low temperatures tunnelling of the protons of the NH 3 group influences the second moment and T 1 rho H results seriously. An analysis of the results h…
The results of an X-ray diffraction investigation of powdered H 3 N.BH 3 are reported. A first-order rotational order-disorder phase transition has been observed at 225K. In the high-temperature tetragonal phase the space group permits twelvefold reorientations of GH 3 and NH 3 groups. The cell parameters are linear f…
For the amorphous alloy of nominal composition Co53Fe5Ni10Si11B16 magnetic properties such as the anisotropy energy, the initial susceptibility, the coercive field, and the remanent magnetization are investigated at room temperatue as functins of an applied tensile stress. From an analysis of the magnetization process…
The heat capacity (C), lattice constant (a), density (d), and electrical conductivity (σ) of RE monosulphides LnSx (Ln = La, Pr, Nd, and Gd) are studied in the homogeneity range (up to x = 0.80). A vacuum adiabatic calorimeter is used to measure C between 2 and 300 K. A systematic analysis of the experimental densitie…
It is shown in this work that the room-temperature excitation spectra of as-grown crystals of LiF, NaF, NaCl, KCl, and KBr doped with ${\mathrm{Mn}}^{2+}$ reveal the existence of double excitation peaks. These peaks are related to the formation of precipitated phases containing ${\mathrm{Mn}}^{2+}$ in the alkali halid…