Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduced nicotinamide adenine dinucleotide phosphate dependent biliverdin reductase. Partial purification and characterizationRaimo Tenhunen, Michael E. Ross, Harvey S. Marver, and Rudi SchmidCite this: Biochemistry 1970, 9, 2, 298–303Publication Date (Print):January 20, 1970…
The recrystallization behaviour of supersaturated and deformed solid solutions was investigated on nickel–aluminum and nickel–beryllium alloys as examples using light and electron microscopy. – For a solid solution with certain alloy content and dislocation density four temperature ranges exist with different recrysta…
Conductivity, optical absorption, and photoconductivity experiments on amorphous ${\mathrm{As}}_{2}$${\mathrm{Te}}_{3}$ films are described. The films were prepared by condensation of the vapor on a cooled substrate. Over the temperature range from about 200 to 400\ifmmode^\circ\else\textdegree\fi{}K, the conductivity…
Shifts in the nematic temperature of a compensated cholesteric liquid-crystal solvent, consisting of cholesteryl chloride and cholesteryl myristate, are caused by adding steroidal solutes. A helical twisting power P can be defined which is a molecular property; there is a linear dependence of the inverse of the solute…
It is shown that the high-temperature behavior of the lattice thermal conductivity of silicon, which has been carefully remeasured recently by Fulkerson et al., can be explained by the four-phonon processes. It has been also found that the major contribution to the phonon thermal conductivity at high temperatures come…
Callaway's model of lattice thermal conductivity has been modified by introducing an arbitrary relation between the phonon frequency and the phonon wave vector, to take account of (i) the phonon dispersion, and (ii) the number of phonon states in the wave-vector space, allowing for separate contributions of the transv…
Measurements on thin films and surfaces have generated a need for a technique whereby one can calculate the phonon properties of small particles containing only a few hundred atoms. We have used moleculardynamic techniques to calculate the frequency distribution and various moments for five different particle configur…
The soft-mode damping and the ultrasonic attenuation at a displacive phase transition has been calculated with the help of a model Hamiltonian. The soft-mode damping parameter $\ensuremath{\Gamma}$ is finite at the transition temperature, whereas the ultrasonic attenuation $\ensuremath{\alpha}$ is singular. For sound…
The single-crystal electron spin resonance spectra of (VII), Mn(II), and Ni(II) are reported in the diamagnetic lattice CsMgCl3 at 298 and 77°K. The structure of the host lattice CsMgCl3 is also reported. The crystal system is hexagonal, space group P63/m mc. The basic structural feature is the linear array of [MgCl6]…
New photoemission data have been obtained from evaporated films of gold in the range of photon energies between 5 and 21.2 eV. With the exception of a single direct transition, all the optical transitions appear to fit a nondirect model; consequently, it has been possible to construct an optical density of states (ODS…
The nonlinear optical properties of Ag3SbS3 (pyrargyrite) as determined by second harmonic generation (SHG) with the 10.6μ CO2 laser are presented. Phase-matched nonlinear mixing is possible and the material is suitable as a phase-matched standard in the infrared for optical nonlinearities.
Beam-attenuation measurements were made on free-standing polycrystalline films of various thicknesses at energies between the work function and several electron volts above. The electron-electron collision mean free paths ${l}_{e}$ were determined by correction of the attenuation lengths for electron-phonon scattering…
The self-consistent phonon theory of anharmonic lattice dynamics is derived via a stationary functional formulation. The crystal dynamics is approximated by a set of damped oscillators, and these are used to construct a trial action, analytically continued into the complex time-temperature plane. Using the action, a f…
Recently, Nozi\`eres et al. have shown that Mahan's model x-ray problem (coupling between the deep hole and electron-hole excitations) could be solved exactly for the singular exponents. Here, it is shown that Lundqvist's model x-ray probelm (coupling between the deep hole and plasmons) may also be solved exactly. Fur…
Abstract This paper considers a multi-phase chemical system which includes solid substances, which can sustain non-hydrostatic stresses. The correct mechanical coordinates are introduced for a phase, which give the correct work done whether the dimensions of the phase are altered by deformation, phase transformations,…
Evidence for the decay of surface plasmons into one-electron excitations has been obtained in photoemission measurements from a slightly roughened surface of aluminum. A simple theory has been developed which explains the resultant photoyield in terms of both the drop in reflectance resulting from roughness-aided plas…
A basic thermodynamic cycle for the production of mechanical power from materials that may be made to contract forcibly and reversibly is described. The cycle differs from existing mechanical power cycles which generally employ expanding fluid as working substances. A "contraction turbine" operating on this cycle has…
Failure under dynamic compression of ductile tungsten alloys was examined by conducting symmetric Taylor tests at impacted speeds ranging from 200 to 350 m/s. A fracture parameter consisting of the average surface shear crack length was identified and computed as a function of the impact velocity. From these data, a t…
On October 5, 1966, during a slow increase in power, the Enrico Fermi Reactor was shut down in an orderly manner after it was obseryed that the control rods were withdrawn further than normal for 31MWt, that several subassemblies had abnormally high outlet temperatures, and that a small amount of F.P. was detected by…
Systematic approaches on the material selection for rickshaw frames were applied by cost per unit and weighted property method using modified digital logic. Ashby's material selection charts were used for preliminary material selection and relative cost analysis. Physical and mechanical properties and the main failure…