Heat capacity and thermodynamic properties of poly(vinyl chloride)
for powdery or relaxed samples occurs around 352 to 356 K for the suspension-polymerized PVC sample and 348 to 351 K for bulk-polymerized sample.
Materials Literature
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CANDU Fuel–Power Ramp Performance Criteria
Extensive fuel performance data obtained from Canadian Deuterium Uranium (CANDU) power reactors and experimental reactors are analyzed. Various modes of power ramping that cause fuel defects are identified, and fuel defect criteria are derived. The probability of a defect occurring in a power ramp is found to depend o…
Surface modification of polymers and practical adhesion
Abstract The, nature of polymer surfaces has received increasing attention as the use of these materials, in a variety of forms, increases yearly. Modifications of polymer surfaces for adhesion, friction, and diffusion oriented appiications have necessitated a careful analysis of the surfade region morphology (surface…
Green's-function theory of the ferroelectric phase transition in potassium dihydrogen phosphate (KDP)
The method of the two-time Green's function is applied to the investigation of the ferroelectric phase transition in K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$. The zero-frequency difficulties are circumvented by means of the fermion Green's function. It is shown that the softening of the mixed mode and the onset of stati…
Effect of Phase Separation on HF Etch Rate of Borosilicate Glasses
Etch rates of borosilicate glasses in HF were studied as a function of heat‐treatment time and temperature for liquid‐in‐liquid phase separation. It is shown that, when the phase‐separated glass has an interconnected microstructure, the composition of the chemically less durable phase is the dominant factor in HF dura…
A fourier transform infrared spectroscopic investigation of polyethylene single crystals. II. Fine structure of the CH2 rocking mode
Abstract The application of the spectral subtraction routine to an analysis of the CH 2 rocking mode of polyethylene single crystals is discussed. A difference band at 716 cm −1 characteristic of a local monoclinic arrangement of chains is detected. Oxidation of crystal mats by nitric acid indicates that these defect…
Raman Spectroscopic Study of the Structural Phase Transitions in K2SnCl6
Abstract Raman spectra of K 2 SnC1 6 are investigated in the temperature range between 50 and 300 K. The observed low temperature spectra are compatible with the proposed monoclinic structure. Two bands that exhibit a soft behaviour are assigned to a zone center and zone boundary rotational mode, respectively. It is s…
Surface plasma oscillations at sinusoidal silver surfaces
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text I. Pockrand and H. Raether, "Surface plasma oscillations at sinusoidal silver surfaces," Appl. Opt. 16, 1784-1786 (1977) Export Citation BibTex Endnote…
Kohn anomaly in the 1T2phase of TaS2
Neutron scattering studies on the 1T 2 phase of TaS 2 at room temperature reveal a strong Kohn anomaly in the longitudinal phonon mode propagating in the (100) direction. The anomaly occurs at a wavevector 0.27a* comparable to the radius of circles of diffuse intensity seen in electron diffraction patterns. The elasti…
Crystal size distribution dynamics in a classified crystallizer: Part II. Simulated control of crystal size distribution
Abstract Control of sustained limit‐cycle instability in crystal size distribution (CSD) was simulated for a class II (high yield) crystallizer equipped with a fines destruction system and product classifier. Control was simulated by proportional control of nuclei density using fines destruction rate as the manipulate…
Determining the periodic response of nonlinear systems by a gradient method
Abstract For systems of differential equations of the form ẋ = f(x) or x = f(x, t ) , a periodic response may be identified by the requirement that x( kT ) = x(0) , where k = 1, 2, … and T is the period, x(0) = x 0 being the initial‐condition vector. We describe a gradient method for finding this x 0 vector by minimiz…
Relative rates of nickel diffusion and copper diffusion through gold
The low-temperature diffusion of nickel through gold has been evaluated using Auger electron spectroscopy. Samples used were printed-wiring-board fingers having a nickel ’’diffusion barrier’’ plated between the copper substrate and the cobalt-hardened gold contact surface. A coefficient was determined for diffusion vi…
ANOMALOUS FREQUENCY AND TEMPERATURE DEPENDENCE OF THE OPTICAL ABSORPTION OF SMALL GOLD PARTICLES
Résumé. — On a étudié les effets de taille dans des particules d'or (102 à 105 atomes/particules) préparées dans une matrice de verre. Des mesures d'absorption à 300 et 1,5 K dans le domaine spectral allant de 0,5 à 4,2 eV ont mis en évidence trois effets lorsque la taille des particules diminue: (i)…
Poisoning titration technique for determining the number of active centers in a supported platinum catalyst
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoisoning titration technique for determining the number of active centers in a supported platinum catalystL. Gonzalez-Tejuca, K. Aika, S. Namba, and John TurkevichCite this: J. Phys. Chem. 1977, 81, 14, 1399–1406Publication Date (Print):July 1, 1977Publication History Publi…
Order-parameter symmetries for the phase transitions of nonmagnetic secondary and higher-order ferroics
A theoretical investigation is presented of the order-parameter symmetries of all possible secondary and higher-order ferroic transitions, (nonmagnetic). These structural phase transitions, which are neither ferroelectric nor ferroelastic, involve the onset of a spontaneous macroscopic quantity represented by a polar…
13C n.m.r. studies of some phenanthrene and fluorene derivatives
Abstract The 1 H and 13 C spectra of fluorene, fluorenone, phenanthrene and their 4‐methyl and 4,5‐dimethyl derivatives have been examined. To complete the analyses for fluorenone and 4‐methylfluorenone, 1 H spectra were recorded at 270 MHz. The results from the 1 H spectra permitted unequivocal assignments for the pr…
Accelerated Corrosion of Copper in Flowing Pure Water Contaminated with Oxygen and Sulfide
Studies of the corrosion of OFHC copper in water contaminated with sulfide, oxygen, or sulfide plus oxygen have shown that the presence of either sulfide (48 to 1940 ppb) plus low oxygen (29 to 60 ppb) or oxygen alone (865 to 6950 ppb) leads to low corrosion rates. However, when both sulfide and oxygen are present in…
States in the gap in chalcogenide glasses
This paper discusses states in the gap in chalcogenide glasses. The model of “charged dangling bonds” put forward by Street and Mott (1975) and Mott, Davis and Street (1975) is reexamined in the light of new experimental evidence and theoretical concepts. It is shown that the model accounts both for the increase in th…
Single and multiple interstitials in FCC metals
Configuration and activation energies and dipole tensors for single and multiple interstitials are calculated by computer simulation using three different potentials for Cu. The single interstitial forms a (100) dumb-bell. The di- and tri-interstitials consist of (100) dumb-bells on nearest-neighbour sites which are r…
Antiferromagnetism of fcc Fe thin films
Thin iron films (∼18 Å and 90% enriched in Fe57) were prepared on (001) Cu single-crystal substrates. The fcc structure was verified by electron microscopy. By Mössbauer spectroscopy it was found that antiferromagnetic ordering begins at around 80±10 K with hyperfine fields of about 16–20 kOe. Additional proof for the…