Materials Literature
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Abstract Caprolactam has been polymerised by sodium hydride in the presence of isocyanate terminated polymers. The latter participate in the initiation reaction and allow the preparation of materials where the prepolymer can amount to 50% of the product. There is evidence that block copolymers are formed, and the prop…
The ratio of the radial diffusion coefficient to mobility D r / mu exp has been measured for the first time in five gases at high E/N (ratio of electric field to gas number density). The range of E/N was as follows: helium 3<or=E/N<or=847 Td; argon 8<or=E/N<or=1271 Td; air 14<or=E/N<or=1412 Td; methane 14<or=E/N<or=56…
Effecls of chro mium, moly'bdenum and vanadium on slJheroidi z alion of carbides in 0.8 0 a carbon sleel b)' slow cooling annealing have been invesligaled.
The effect oj boron on the transformation oj 10w-carbon-!-mo!),bdCllum steels has been investigated by means oj dilatomelly and microstructural observations.The steels containing boron below 30 ppm exhibits the largest hardenability in the case oj austenitization at 930°C, but the hal-denability is reduced by austmiti…
The low-temperature thermal conductivity of three type-II $a$ diamonds irradiated with 0.75-MeV electrons at room temperature and one irradiated at 77 K was found to be reduced and is characteristic of phonon scattering by large aggregates: the conductivity changing from Rayleigh scattering at the lowest temperatures…
The theory of the angularly dependent photoemission from a semi-infinite crystal as a one-step process is briefly reviewed, starting from the formulas of Adawi and using surface-matched wave functions in both upper and lower states and absorption in the upper state. We derive conditions under which the three-step mode…
A systematic perturbation theory is developed to study the interaction of electromagnetic waves at rough dielectric surfaces. The Ewald-Oseen extinction theorem is used as the basis of the perturbation theory. Explicit expressions for both first-order and second-order fields (in terms of the surface roughness paramete…
In previous publications we reported on the optical properties of aggregated metal systems, where the metal particles were assumed to be free-electron type with damping, and where they were assumed to be dispersed in a dielectric medium with a varying index of refraction. The main results were the shift of bulk and su…
We report measurements of C${\mathrm{O}}_{2}$ photodesorption and associated surface-conductivity changes in ZnO. The measurements show a one-to-one correspondence between the rates of those two quantities. The rates of both C${\mathrm{O}}_{2}$ photodesorption and surface-conductivity changes are initially fast, becom…
Polarized spectra of evaporated thin films of ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ glass have been recorded before and after annealing at the glass transition temperature and compared with the corresponding spectrum of the bulk glass. The spectra of virgin films consist of several sharp molecular bands superposed on…
Mid-gap optical absorption and electron spin resonance (ESR) attributed to optically induced localized paramagnetic states have been studied in several chalcogenide glasses and amorphous arsenic for $T\ensuremath{\le}80$ K. The observation of these optically induced metastable paramagnetic centers provides the most di…
A method is proposed for estimating the free energy of cation vacancy migration in alkali halides with NaCl structure from macroscopic parameters. It is based on the calculation of the electrical and the dilatation work during the migration of the cation. The dilatation work can be calculated from the elastic constant…
The infrared reflectivity of reduced rutile $\mathrm{Ti}{\mathrm{O}}_{2\ensuremath{-}x}$ at room temperature is reported at departures $x$ from stoichiometry varying from ${10}^{\ensuremath{-}3}$ to 5 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}2}$. The electron carriers resulting from the lattice defects…
The transport of excess holes in amorphous Si${\mathrm{O}}_{2}$ is reported as a function of field and temperature, with an emphasis on the behavior at short times ($t\ensuremath{\ge}10$ nsec) after the hole is introduced into the glass. The unusual features of the transport for $t\ensuremath{\gtrsim}{10}^{\ensuremath…
An extensive experimental and theoretical study of transient hole transport in evaporated $a\ensuremath{-}{\mathrm{As}}_{2}{\mathrm{Se}}_{3}$ unambiguously establishes that the microscopic transport mechanism is characterized by a broad distribution of individual event times. This feature leads to (i) a sample thickne…
The radiative decay of non-radiative surface plasmons excited by fast electrons on sinusoidally modulated Ag surfaces has been investigated systematically for different modulation heights. The position and half-width of the surface-plasmon dispersion of weakly modulated gratings are in agreement with theoretical value…
The association constants for the binding of various saccharides to hen egg-white lysozyme and human lysozyme have been measured by fluorescence titration. Among these are the oligosaccharides GlcNAc-beta(1 leads to 4)-MurNAc-beta(1 leads to 4)-GlcNAc-beta(1 leads to 4)-GlcNAc, GlcNAc-beta(1 leads to 4)-MurNAc-beta(1…
Abstract The magnetic properties of oxovanadium(IV) complexes of Schiff bases(I) are reported. Contrary to an earlier report that these complexes are involved in magnetic exchange, the complexes are found to be magnetically dilute. The complexes display μeff in the range 1.68–1.71 B. M. at 78–297 K with θ=2–4 K, and e…
In the manufacturing process of a submarine coaxial cable, a multitrough water cooling system is used to avoid formation of voids and to strengthen the gripping force between the insulation polyethylene and the metallic center conductor. In submarine coaxial cable systems, the standards for dielectric properties of th…
<div class="htmlview paragraph">The basic working principles and the different types of multifunctional catalysts for “three way systems” are reviewed. Test methods for multifunctional catalysts characterizing activity and stability are described. Ageing procedures in air may cause problems with rhodium containi…