Materials Literature
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An assessment is made of the relative contributions of mechanical and sonochemical effects to damage suffered by mammalian cells when sonicated in aqueous-suspension culture. In a 1-MHz progressive wave beam, under conditions providing stabilization of the cavitation field, the intensity threshold and intensity optimu…
A careful study of the dispersion of the transverse acoustic phonons and the low-frequency transverse optic phonons in KTa${\mathrm{O}}_{3}$ has been carried out by inelastic neutron scattering. In addition to the well-known temperature dependence of the optic-mode frequencies, both the acoustic-phonon frequencies and…
Using a perturbation expansion based on a strong cubic-field zeroth-order approximation, we have obtained analytical expressions for the $g$ values of the ${{t}_{2}}^{3}$, $^{4}A_{2}$, and $^{2}F$ terms for ${d}^{3}$ impurity ions in trigonal crystal fields. We have compared these expressions whth the results of a num…
As a first stage in a study of the low-temperature-region behavior of aqueous solutions, the composition regions of a large number of binary salt-water systems in which macroscopic samples can be obtained in the vitreous state have been determined. The glass transition temperatures Tg within these regions have also be…
The role of the chloride ion in iron corrosion is assessed from the viewpoint of developing the concept that would lead to a general explanation. The experimental observations relating to such factors as the oxygen effect, concentration, cation, temperature, and pH dependence are reviewed. Some of the observations on…
The structure trend that is observed across the transition metal series as the number of valence electrons N increases 3 to 11 is explained quantitatively. The difference in the total one-electron band structure energy between the close-packed structures face-centred cubic and hexagonal close-packed is shown to determ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface and interfacial tensions of polymer melts. II. Poly(methyl methacrylate), poly(n-butyl methacrylate), and polystyreneSouheng WuCite this: J. Phys. Chem. 1970, 74, 3, 632–638Publication Date (Print):February 1, 1970Publication History Published online1 May 2002Publish…
It is pointed out that the spectra of X-ray induced fast photoelectrons from metal should have a characteristic skew line shape resulting from Kondo-like many-electron interactions of the metallic conduction electrons with the accompanying deep hole in the final state. The same line shape should also occur for the dis…
Many two-phase alloys work-harden much faster than do pure single crystals. This is because the two phases are not equally easy to deform. One component (often dispersed as small particles) deforms less than the other, or not at all, so that gradients of deformation form with a wavelength equal to the spacing between…
Abstract A study was made of adsorption of n-dotriacontane and n-butanol dissolved in n-heptane onto graphitized carbon black and various ground graphites having surface areas ranging from 5 to 700 m2 g-1. It was established that the adsorption of n-dotriacontane by the graphites is confined entirely to the basal plan…
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…