Materials Literature
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Results are given of experimental and theoretical investigations of electron emission, observed under plastic deformation of colored alkali halide crystals. The emission is shown to be due to Auger process by the electrons pushed out of the surface from F-centres by dislocation. A comparison of theory and experiment p…
A new type of chalcone crystal was prepared. Anisotropic indices with wavelength dispersion were measured by the Brewster angle method. The two largest second-harmonic generation (SHG) tensor components were determined by the wedge method and compared with d11 of 2-methyl-4-nitroaniline. Calculated collinear and nonco…
The phenomenon termed fractoemission was monitored in soda-lime-silica glass specimens during slow crack growth. No electron, ion, or photon signals were detected until crack velocities reached approximately 10−2 m/s. These observations suggest that the more intense fractoemissions observed during fast fracture are du…
Investigations of the electromechanical properties of BTS-ceramics show unusual strain-field curves and extraordinary high weak-signal electrostrictive R coefficients. In the process of selecting two examples (BTS-10 and BTS-13) it is illustrated that the strain-field curves differ significantly from those of lead per…
A neutronographic study is made of magnetic structure and spin-orientational transitions in polycrystalline samples of the system BaCo2−xZnxFe16O27 (Co2−xZnxW). Along with this studies measurements of the macroscopic magnetic characteristics, X-ray dilatometry, and DTA are performed. The diagram of the magnetic state…
The internal tensile stress in polycrystalline diamond films deposited on silicon substrates has been measured from 100 to 700 K by a vibrating-membrane method. The stress increases strongly with temperature, in a manner consistent with the elastic accommodation of the differential thermal strain between diamond and s…
We present results on the resistivity \ensuremath{\rho}, specific heat ${\mathit{C}}_{\mathit{p}}$, and susceptibility \ensuremath{\chi} of ${\mathrm{K}}_{0.3}$${\mathrm{MoO}}_{3}$ near the Peierls transition ${\mathit{T}}_{\mathit{p}}$ at 180 K. Our resistivity measurements demonstrate that fluctuations intrinsic to…
The crystal structure of porin from Rhodobacter capsulatus strain 37b4 has been solved at 3.0 A (1 A = 0.1 nm) resolution by multiple isomorphous replacement and solvent-flattening. The three pores of the trimer are well defined in the electron density map. Each pore consists of a 16-stranded beta-barrel which travers…
Two bubbles are simultaneously generated in water by focusing a Q-switched ruby laser. The dynamic behavior of the induced bubbles is investigated by means of high-speed photography. Consequently it is found that the bubble–bubble interaction is significantly influenced not only by the relative size of bubbles but als…
The authors present a detailed analysis of the electrical and optical properties of amorphous transparent conducting thin films of indium oxide prepared by ion beam sputtering with a wide range of carrier concentrations. They show that the resistivity is dominated by ionised impurity scattering despite the amorphous s…
[Zn(C 44 H 28 N 4 )(H 2 O)] cristallise dans I4/m avec a=13,425, c=9,6994 A, Z=2; affinement jusqu'a R=0,043. Cette structure a ete reetudiee afin de mesurer, avec plus de precision, le deplacement du zinc par rapport au plan de la porphine. Ainsi, ce deplacement est de 0,173 A. Le zinc n'est coordine qu'a une seule m…
The magnetic structure factors determined using polarized neutron scattering are employed to analyze the magnetic-moment distribution of Fe in ${\mathrm{Fe}}_{3}$(${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Si}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$) alloys. The spherical and aspherical parts of the distributions are not mu…
Low-energy electron transmission experiments were performed for two types of amorphous films (solid amorphous and molten amorphous films) of tetratetracontane [${\mathrm{CH}}_{3}$(${\mathrm{CH}}_{2}$${)}_{42}$${\mathrm{CH}}_{3}$]. The temperature dependence of the transmission spectra and the spectral changes due to t…
The concept of competition-during-heating as a mechanism for TL supralinearity and sensitization in TLD-100 is re-examined. It is demonstrated that with this model it is not necessary that the competing traps be removed by radiation in order for supralinearity to be obtained. Furthermore, the arguments for and against…
Yttrium oxide (Y2O3) thin films were deposited on indium-tin-oxide(ITO)-coated glass substrates by the radio-frequency-sputtering method using an Y2O3-sintered target. The relative dielectric constant εr and the dielectric strength EBD of the Y2O3 films were studied. It was found that εr and EBD have a maximum value a…
Using an expansion of \ensuremath{\sim}2870 plane waves, we have performed ab initio calculations of the energy bands, equilibrium lattice constants and atomic positions, and cohesive energy of ${\mathrm{B}}_{12}$. We find an indirect gap of 1.427 eV and a direct gap of 1.780 eV. The lattice constants and atomic posit…
cis-Bis-neodecanoato-trans-R,R-1,2-diaminocyclohexaneplatinum++ +(II) (NDDP) is a liposome dependent cisplatin analogue since the liposome carrier is required for its i.v. administration and for its biological activity. A Phase I study of liposome entrapped NDDP (L-NDDP) was performed using a single i.v. injection eve…
The second harmonic generation (SHG) coefficients dij of several corona-poled guest-host and side-chain polymers have been measured and studied over time using a new Maker Fringe analysis. The electro-optic coefficient r33 and scattering losses have also been measured in thin-film waveguides, on silicon and glass subs…
Transport and optical properties of n-type CdSe crystals together with microanalysis of residual impurities from two different sources (A and B) were investigated and compared in detail. It was found that the electronic properties of the crystals are governed by two kinds of shallow donors. At low temperatures (T150 K…
We have measured, as a function of temperature, the thermopower, the dc conductivity, and photoconductivity of ${\mathrm{FePS}}_{3}$ single crystals. For temperatures below 430 K the thermopower shows an activated behavior, whereas at higher temperatures it is almost temperature independent. The dc dark conductivity a…