Materials Literature
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Abstract Results obtained when investigating the fracture behaviour of wood have suggested the possibility of making composite materials with high work of fracture and low density, at the expense of moderate loss of stiffness. The reinforcing elements of the composite are made in the form of cylindrical tubes with hel…
A comparison of angle-resolved photoemission energy distributions for pure graphite and the intercalation compound Li${\mathrm{C}}_{6}$ show that considerable charge is transferred from Li to C, as expected; but the valence bands do not shift uniformly upon intercalation, in contradiction to the rigid-band approximati…
An experimental research of thermal and optical bleaching in the chalcogenide vitreous semiconductors of the As–Se system and in elemental vitreous selenium hasbeen carried out. A strong dependence of the bleaching features on the ratio of the components is shown. To explain the bleaching process the configurational m…
Electron spin resonance from X-ray irradiated single crystals of barium sulphate (BaSO4) is obtained at room temperature and the principal g-values of the induced traps are calculated from measured data. Signals indicating five different types of traps are observed and may be identified to be VBaSO, SO (hole traps),…
Three conjugations oj [Liquid-Iron-(Mn,Fe)S] , [Liquid-Iron-(Fe, Mn )S] and [ Iron-(Mn,Fe)S-(Fe, Mn )S] ill the Fe-Mn-S temary -!)istem cOlltaining liP to 4 ~o oj mallganese in iroll phase, were investigated as the first apj"oach to understand the kinetics oj sulfide jormation in steel, and the compositions oj all pha…
L-Serine-L-ascorbic acid, C3HTNOa. C6HsO6, a 1:1 complex between the amino acid serine and the vitamin ascorbic acid, crystallizes in the orthorhombic space group P2~2~2~ with four formula units in a cell of dimensions a = 5.335(3), b = 8.769(2), c = 25.782 (5) A. The structure was solved by direct methods and refined…
A previously reported multiconfiguration self-consistent field (MCSCF) algorithm based on the generalized Brillouin’s theorem is extended in order to treat excited states of polar molecules. In particular, the algorithm takes into account the proper treatment of nonorthogonality in the space of single excitations and…
We report observations on the alignment of nematic liquid crystals on surfaces of obliquely deposited silicon monoxide, with and without additional treatment with surfactant. The liquid crystals reported on are 4.4-dihexylazoxybenzene and 4-heptyl-4’-cyanobipheny. The surfactants used are N,N-dimethyl-N-octadecyl-3-am…
The scattering properties of dielectric gratings having asymmetric triangular profiles are determined by a simple approach that views the grating structure as a double set of parallel planes. The energy of an incident surface wave is then scattered in preferential directions that are consistent with the grating period…
A 1975 treatment of single-double multiple scattering of electrons by randomly oriented vapor-phase molecules is put on a firmer footing and extended to higher order. It is shown how to include effects of intramolecular Fresnel diffraction, as an electron scattered by one atom propagates to the next, without ever expl…
A molecular dynamics study of the glass forming properties of the inverse-twelfth-power soft-sphere model is reported. MD results in the equilibrium range for N=4000 are used to parametrize a six-term virial equation for the fluid and a three term anharmonic perturbation equation-of-state for the crystal, and thereby…
Using a dynamic Monte Carlo method we investigated the thermodynamics of static and time-dependent properties of the freely jointed polymer chain with Lennard-Jones type intramolecular forces. The Θ temperture is calculated to kBΘ/−=3.70±0.01 (− is the Lennard-Jones energy parameter). We give estimates for the equilib…
Raman spectra have been recorded for solids and melts of composition MgCl 2 + nACl (n = 0–4 and A = Cs, Rb, K, Na, Li). Characteristic spectra have been observed for each of the solids predicted from phase diagram studies and an additional two compounds formulated as Rb 3 MgCl 5 and K 3 MgCl 5 were detected. The compo…
Raman and infrared spectra on well-staged graphite-Al${\mathrm{Cl}}_{3}$ are reported for compounds with stages $n=1, 2, 4, \mathrm{and} 8$. Of significance is the absence of infrared-active modes for stage-1 graphite-Al${\mathrm{Cl}}_{3}$ and the presence in stages 2, 4, and 8 of three infrared-active modes in the vi…
1. The effects of various concentrations of ascorbic acid on the quality and quantity of the insoluble extracellular matrices produced by two strains of cultured rat smooth-muscle cells were studied. 2. Ascorbic acid was necessary for the appearance of insoluble collagen in the extracellular matrix. 3. Secretion of so…
The magnetoreflection technique is applied to study Landau-level transitions in graphite under pressures up to 2 kbar to provide detailed information on the pressure dependence of the graphite electronic structure. In this pressure range the magnetoreflection spectra can be explained in terms of the Slonczewski-Weiss-…
The temperature dependence of the paramagnetic shifts in square planar ferrous complexes has been investigated for a number of porphyrin derivatives. Large anomalies in the Curie law have been observed in newly synthesized substituted tetraphenylporphins in which the environment of both faces of the tetrapyrrolic ring…
The interaction between two 4f electrons in a rare-earth ion by means of the polarization of a ligand in a solid is discussed. It is shown that this interaction gives rise to a host dependent shift of the energy separations between the 4f N and 4f N−1 nl configurations. The results of the theory of these energy shifts…
The structure and stability of metallic glasses and the relationship between the constitution diagram and glass formation in binary alloy systems is discussed on a quantum-mechanical basis. An ab initio pseudopotential method is used to calculate the interatomic forces in transition-metal-free glass-forming alloys. Th…
Single crystals of triglycine sulphate (TGS) doped with o-, p- and m-nitroanilines and L-alanine have been grown by the method of temperature lowering. Their dielectric permittivity and electrical conductivity have been studied as a function of temperature. The observed increase in the Curie temperature due to p-nitro…