Materials Literature
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Luminescence excitation spectra in barium fluorohalides have been studied using synchrotron radiation of the SIBERIA-I electron storage ring in the energy range from 4 to 35 eV. The energy position of edge and core exciton formation as well as that of the electronic excitation multiplication threshold have been establ…
Abstract A cation radical salt between a π-electron donor decacyclene and hexafluorophosphate, (Dc)3(PF6)2, was prepared by electrochemical synthesis, and conductivity (90–350 K), electron paramagnetic resonance (4–400 K) and static susceptibility (2–300 K) were measured. The salt was found to be semiconductive with t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structure of one-dimensional linear halogen-bridged gold chainsChristoph Janiak and Roald HoffmannCite this: Inorg. Chem. 1989, 28, 14, 2743–2747Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 July 1989https:/…
Local spin-density calculations have revealed that the degree of the local distortion to the Ni-${\mathrm{O}}_{6}$ octahedra in ${\mathrm{La}}_{2}$${\mathrm{NiO}}_{4}$ has profound effects on its electronic and magnetic properties. In particular, the antiferromagnetism is strongly dependent on the ratio of the Ni-${\m…
A model of controlling the temperature in heat conduction is considered; the control mechanism is accomplished by means of a hysteresis operator that depends on some parameters. A cost functional is introduced that depends on these parameters and then properties for the optimal parameters are derived.
A light-scattering technique was used to study the anisotropy of turbidity and the three elastic constants K 1, K 2 and K 3 of 8CB as a function of temperature and sample thickness. The turbidity was measured in the nematic and schematic A phases at sample thicknesses l of 0.02, 0.04, 0.1 and 0.2 cm. The effect of the…
Abstract The composite wave variational version of the APW method is used to obtain the electronic band structure of the compounds boron phosphide and boron arsenide at the high symmetry points Γ, X, and L. The tight binding interpolation scheme of Slater and Koster is used to calculate the rest of the band structure.…
The authors developed an insulation diagnostic system that makes automatic measurements of the dielectric dissipation factor and DC component in a hot-line XLPE (cross-linked polyethylene) insulated power cable and makes an overall judgement of cable insulation deterioration. This system was tested on XLPE cables in h…
Magnetoelastic effects in the three-sublattice noncollinear antiferromagnet Mn3NiN are studied theoretically. Shear deformations are shown to give rise in the crystal to a piezomagnetic moment of an exchange nature. The magnitude of the piezomagnetic moment is comparable with the weak ferromagnet moment detected exper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism and kinetics of curing of epoxides based on diglycidylamine with aromatic amines. 2. The reaction between diglycidylaniline and anilineLibor Matejka and Karel DusekCite this: Macromolecules 1989, 22, 7, 2911–2917Publication Date (Print):July 1, 1989Publication Hist…
A novel approach to determine whether ferroresonance can occur is developed. It is based on the energy transferred from the system to the voltage transformer during the switching transient. This approach is used to develop a practical test criterion to indicate if ferroresonance can occur at a specific station. The nu…
Abstract In these three decades of progress, thermoplastic elastomers have risen in 1987 to a position of tenth in the order of commercial thermoplastic sales in the U.S.A., with a growth rate, 1986–1987, of 9.7%. It is very probable that the quantity shown for 1987 sales, 441 million pounds, is low, since it is well…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelationship between craze microstructure and molecular entanglements in glassy polymers. 1Larry L. BergerCite this: Macromolecules 1989, 22, 7, 3162–3167Publication Date (Print):July 1, 1989Publication History Published online1 May 2002Published inissue 1 July 1989https://p…
The milestones which have marked the development of today's liquid crystal display and liquid crystal material technologies are reviewed. The main emphasis is placed on the predominant nematic field effects and liquid crystals.
Platinum and platinum alloy films electrodeposited from conventional aqueous electrolytes find application for a wide range of uses. During deposition a variety of problems have to be overcome, necessitating optimisation of process conditions; in addition currently available platinum plating processes are not consider…
A study of effective atomic numbers for biological materials such as bone, muscle, spleen, liver, mucin, and water has been carried out in the energy region 1 to 50 MeV for photons, electrons, and He ions. It is noticed that the effective atomic number for photons and electrons increases with energy, and remains, more…
Tensile strengths of 2.0 to 5.0 mol% Y 2 O 3 ‐stabilized ZrO 2 polycrystals were described using the newly developed tensile testing method. The tensile test was conducted by attaching three strain gauges on both sides of a rectangular bar that was 10 mm by 1 mm by 200 mm. The tensile strength of tetragonal ZrO 2 poly…
Abstract An Aquic Fragiudalf developed from a fluvial terrace of Pleistocene age in northwestern Italy was investigated to determine the possible role of different compounds in fragipan bonding. Fragipan characteristics appeared only in yellow, goethite‐containing zones of the fragipan horizon but not in gray, essenti…
The corrosion inhibition of zinc in HCI solutions by several pyrazole derivatives-namely, 3(5) amino, 5(3) phenylpyrazole; 3(5) amino, 5(3) [4'-methylphenyl] pyrazole; 3(5) amino, 5(3) [4'-methoxyphenyl] pyrazole; and 3(5) amino, [4'-chlorophenyl] pyrazole-was studied by capacitance and polarization measurements. Thei…
A fast, accurate, inexpensive, and nondestructive method to determine the density of very porous ceramics has been found. This method is an extension of the water‐displacement technique with three weighings and the use of glycerol instead of water. For small (1.13 g), 29% porosity B 4 C pellets, the precision is 0.002…