Materials Literature
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We measured reflectance and transmittance spectra of epitaxial ${\mathrm{BaPb}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$ ${\mathrm{Bi}}_{\mathrm{x}}$${\mathrm{O}}_{3}$ (x=1.0, 0.8, and 0.6) thin films, prepared by pulsed-laser deposition. The measured spectra showed strong absorption in the frequency regions below direct…
The first-order Raman spectra of A g (1) , A g (2) + B g (2) and B g (1) modes in CaWO 4 crystal were measured in the temperature range of 77–771 K and the linewidths at these temperatures were obtained. The temperature dependence of the linewidths was analyzed using the phonon dispersion curves calculated on the basi…
Band-gap states in V-doped ${\mathrm{TiO}}_{2}$ have been studied by photoemission spectroscopy over a range of photon energies encompassing the Ti 3p and V 3p core thresholds. The states show resonant enhancement at photon energies significantly higher than found for Ti 3d states introduced into ${\mathrm{TiO}}_{2}$…
This paper reports on the p to n transition in Pb doped Se–In chalcogenide glasses. Measurements of thermoelectric power in the temperature range 300 K⩽T⩽315 K, dc conductivity in the temperature range 100⩽T⩽300 K, and optical band gap (Egopt) have been carried out for Se75In25−xPbx (x=0,5,10,15) samples. The p-n tran…
The electronic states and optical transition properties of three semiconductor wires Si, GaAs, and ZnSe are studied by the empirical pseudopotential homojunction model. The energy levels, wave functions, optical transition matrix elements, and lifetimes are obtained for wires of square cross section with width from 2…
The effects of irradiation-induced luminescence enhancement by ZnS:Mn(2+) nanoparticles in poly(vinyl butyral) films are reported. The luminescence intensity increases several times when fresh samples are irradiated by a 248-nm excimer laser. The decay time also increases with exposure time. The increase in the initia…
The mass distribution of neutral carbon clusters generated by a laser vaporization of graphite in He was safely determined by a single photon (10.5 eV) ionization technique. The resulting mass distribution was surprisingly different from those reported in previous articles. It was found that the carbon clusters genera…
The electronic structure of the doped manganites ${\mathrm{Pr}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Ca}}_{\mathrm{x}}$${\mathrm{MnO}}_{3}$ was calculated by the LSDA+U method which takes into account the local Coulomb interaction between d electrons of transition-metal ions. In contrast to the standard loca…
The binding isotherm to cellulose of cellobiose dehydrogenase (CDH) from Phanerochaete chrysosporium has been compared with that of cellobiohydrolase 1 (CBH 1) from Trichoderma reesei. CDH binds more strongly but more sparsely to cellulose than does CBH 1. In a classical Scatchard analysis, a better fit to a one-site…
The most important reactive groups in collagen are amino, amido, guanidino, and carboxyl, all of which are present in comparatively large numbers. It is possible to modify amide groups present in the collagen of achilles tendons and hide trimmings by desamidation (DAM). DAM causes progressive hydrolysis of the amide g…
Theoretical interpretation of the thermally stimulated conductivity (TSC) is suggested for the temperatures at which transport is via hopping of carriers through localized bandtail states. The description is not based on specific assumptions used in the most of the previous TSC theories, such as, e.g., neglect of the…
In our present study, the origin of the increase in resistivity of polycrystalline Mn0.47Zn0.47Fe2.06O4 with increasing oxygen partial pressure was investigated by measuring thermoelectric power and electrical resistivity, and through analysis of grain size. The ferrous ion (Fe2+) concentration of the samples was esti…
The relaxation modes and rates of a single polymer chain are studied by Monte Carlo simulations of the bond fluctuation model. On the basis of the method proposed by Takano and Miyashita [J. Phys. Soc. Jpn. 64 (1995) 3688], the approximate relaxation modes and rates are obtained by solving a generalized eigenvalue pro…
We present temperature-dependent V-2p and O-1s x-ray-absorption spectra of ${\mathrm{LiVO}}_{2}$. The aim of this study is to monitor changes in electronic structure on going through the phase transition. The spectral changes turn out to be very small: the V-3d--O-2p hybridization does not change considerably, and the…
Rietveld refinement of X-ray powder data measured for CuCr2O4 [copper(II) dichromium(III) tetraoxide] and CuRh2O4 [copper(II) dirhodium(III) tetraoxide] indicates that their structures at room temperature are centrosymmetric, I41/amd, rather than as previously reported, noncentrosymmetric I-42 d. Trial refinement in I…
First-principles calculations on the geometry and stability of ${\mathrm{Al}}_{\mathrm{n}}$${\mathrm{B}}_{\mathrm{m}}$ clusters have been carried out to examine the effect of size, composition, and electronic-shell filling on their relative stability. It is shown that although Al and B are both trivalent, a ${\mathrm{…
We have studied thermal conductivity, thermopower, and resistivity of bulk polycrystalline ${\mathrm{La}}_{0.8}$${\mathrm{Ca}}_{0.2}$${\mathrm{MnO}}_{3}$. Large changes in the magnetothermal conductivity of about 15% and the thermopower as large as 80% were found in addition to a large magnetoresistivity of 80% around…
Using extraordinarily low pressure (0.1--1 Torr) we obtained high-density nucleation of diamond on mirror-polished silicon in a hot-filament chemical vapor deposition (HF-CVD) system. A diamond nuclei density as high as ${10}^{10}$--${10}^{11}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}2}$ was achieved, which was compara…
The optical and electrical properties of the lead bearing glasses in the PbO-TiO2, PbO-TeO2, and PbO-CdO systems have been investigated. The density, refractive index, optical band-gap, and Urbach energies of these glasses are reported. It is shown that the additive nature of oxide ion polarizabilities reported for th…
We present a joint experimental and theoretical investigation of the linear and nonlinear optical response of butadiyne-linked zinc porphyrin oligomers. Efficient overlap between the chromophores leads to a large red-shift of the Q absorption band together with a splitting of the B band into two components when increa…