Materials Literature
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Abstract We measured thermal conductivities as well as electric conductivities of some composites in several types of dispersion systems. The dispersion state, that is, the ease in forming conductive chains in these composites, was estimated by the characteristic electric conductivities and compared with the thermal c…
The recovery of proteins following denaturation is optimal at low protein concentrations. The decrease in yield at high concentrations has been explained by the kinetic competition of folding and "wrong aggregation". In the present study, the renaturation-reoxidation of hen and turkey egg white lysozyme was used as a…
The Kapitza conductivity (thermal boundary conductivity (TBC)) between two crystals is studied within a simple three-dimensional lattice dynamical model and the role of interface roughness on an atomic scale is investigated. The interface roughness is modelled by a random alloy monolayer A 1-x B x between the two semi…
The phase transformations and structure characteristics of the Al 65 Cu 17.5 Co 17.5 alloy were studied by neutron diffraction. The scheme of Yamamoto and Ishihara (1988) can satisfactorily index the diffraction patterns. The Al-Cu-Co decagonal phase is stable in the temperature range between 973 and 1350 K. At the lo…
We have discovered novel nonlinear dissipative dynamic patterns in nematic liquid crystals under the influence of a continuously rotating magnetic field. We present a state diagram of the soliton structures as a function of field and rotation rate and discuss physical models describing their growths and propagation an…
Lead zirconate titanate films have been fabricated by a dc sputtering technique with a post deposition rapid thermal annealing treatment at 650 °C for 10 s. The films exhibited good structural, dielectric, and ferroelectric properties compared to conventional furnace-annealed films. The measured dielectric constant an…
We have observed a clear series of fine structures superposed on the angular dependence of magnetoresistance in the metallic and magnetic-field-induced spin-density-wave phases in the low-dimensional organic superconductor (TMTSF${)}_{2}$${\mathrm{ClO}}_{4}$. They appear at the field angles whose tangent satisfies a f…
We show that director fluctuations in nematics induce long-range interactions between walls, analogous to van der Waals forces, which are attractive with symmetric boundary conditions, but may become repulsive with mixed ones. They affect the swelling of lamellar phases in a nematic solvent. The same phenomenon takes…
We examine equilibrium phase separation in a grafted polymer layer composed of mutually immiscible chains. Under symmetric melt conditions, we predict that there is a transition to a ``rippled'' phase--a density wave in composition running along the surface. This transition is expected for a molecular weight 2.27 time…
The dependence of the flow stress of high-purity α-iron monocrystals on temperature and strain rate, measured by successive tensile deformations at temperatures between 250 and 340 K and correlated stress-relaxation tests, is analysed by means of Seeger's theory of thermally activated kink-pair formation in screw disl…
A microscopic calculation of the second-order Raman-scattering efficiency of silicon, with special emphasis on the effects of uniaxial stress, is presented. Employing diagrammatic perturbation theory, the scattering efficiency is obtained for incident- and scattered-photon energies either on or off resonance. A numeri…
(I) CdSrP 2 O 7 cristallise dans P2 1 /n avec a=5,414, b=8,615, c=12,878 A, β=90,01°, Z=4; affinement jusqu'a R=6,0%. (I) CdBaP 2 O 7 cristallise dans P1 avec a=5,641, b=7,038, c=7,624 A, α=78,55, β=89,83, γ=86,79°, Z=2; affinement jusqu'a R=6,0%. Ces deux composes existent a l'etat solide comme les dichromates, avec…
We study transmission \ensuremath{\Vert}${\mathit{t}}_{\mathit{N}}$\ensuremath{\Vert} and reflection \ensuremath{\Vert}${\mathit{r}}_{\mathit{N}}$\ensuremath{\Vert} of a plane wave (with wave number k>0) through a one-dimensional array of N \ensuremath{\delta}-function potentials with equal strengths v located on t…
(NH 4 ) 3 [H 6 RhMo 6 O 24 ]•6H 2 O cristallise dans P2,1c avec a=11,435, b=11,017, c=11,789 A, β=100,02, Z=2; affinement jusqu'a R=0,042. Le polyanion [H 6 RhMo 6 O 24 ] 3− , de symetrie D 3d , est de meme structure que [H 6 Cr II Mo 6 O 24 ] 3− . L'octaedre RhO 6 , situe sur un centre d'inversion, est de forme rhomb…
Reflection-absorption infrared spectroscopy (RAIRS) in the spectral region 1700--280 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ used to identify and characterize three forms of oxygen adsorbed on a polycrystalline silver ribbon. The high resolution of RAIRS allows us to interpret the spectra resulting from adsorption…
The photoionization efficiency spectra of nickel clusters containing adsorbed ammonia have been recorded near threshold. Ionization potentials (IPs) have been assigned for 97 selected Nin(NH3)m species, with n up to 56 atoms. We observe that nickel cluster IPs decrease upon ammonia adsorption, with the magnitude of th…
The absorption of H and D into a palladium sphere of precise radius and density is examined experimentally with use of pressure-volume-temperature measurements and control techniques to achieve the stepwise boundary condition and constant pressure assumed in the common solutions to Fick's second law. Measurements were…
Photoelectron diffraction and Auger-electron diffraction studies to date have involved the study of the elastically scattered or ``no-loss'' features in spectra. In this work, we consider the diffraction patterns associated with inelastically scattered electrons in plasmon satellites. Although very similar in most pea…
Electro-optic properties of thin polymeric films can be studied by incorporating the films into the spacer layers of transmission-mode Fabry–Pérot devices formed using metal mirrors. The metal mirrors, which also serve as electrodes, are used for the application of an electric field for poling the polymeric material a…
Sound velocity, υ s , has been measured to examine the thermodynamics of structural transitions in the liquid Se-Te system. The isothermal compressibility, κ T , deduced from υ s together with the thermal expansion coefficient, α P , the constant pressure specific heat, C P , and the density shows a broad maximum when…