Materials Literature
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Threshold stress in constant load tests and critical stress in constant strain tests for sulfide stress corrosion cracking (SCC) of seven tubular steels were measured. Percent reduction in area loss caused by SCC of four tubular steels also were measured. Results showed there was no interrelationship among the three p…
book review: Selden, P.A. (Hrsg.): Porceedings of the 17th European Colloquium of Arachnology. Edinburgh 1997
This paper considers the objective evaluation of seam puckering on three-dimensional garments. In order to simulate garment surfaces in three dimensions, seamed samples are supported on five different surfaces: plane (both with and without tilt) and curved (both convex and concave). A set of five samples having seams…
The evolution of the brilliance of synchrotron radiation sources has allowed combined functionalities of beamline optics for simultaneous high intensity, rapid tunability and narrow wavelength bandpass. This then combines the chance to measure protein crystal diffraction data at multiple wavelengths for optimized anom…
Three types of tetraazamacrocycles (1,4,8,11-tetraazacyclotetradecane, 1,4,8,12-tetraazacyclopentadecane, and 1,4,8,11-tetraazacyclotetradecane-5,7-dione) are grafted on the surface of phosphorus-containing dendrimers possessing P(S)Cl2 end groups (for generations 1 and 3: this corresponds to three and twelve macrocyc…
Oxygen diffusion is treated in a dense electronically conducting cobaltate pellet blocked ionically on one surface, electronically on the other, and sealed on its cylindrical periphery. A procedure is developed for extracting the chemical diffusion and surface exchange coefficients for oxygen by use of the asymptotic…
The generation of double kinks in sessile screw dislocation cores is a highly nonlinear process but is the rate-controlling step for plasticity at low temperatures. In this work, double-kink generation in threefold screw dislocations in bcc crystals is studied within the framework of the Peierls-Nabarro (P-N) model in…
The synthesis together with mechanical property and rheological characterization of novel star–block copolymers comprising multiple polystyrene (PSt)-b-polyisobutylene (PIB) arms emanating from polydivinylbenzene (PDVB) cores are described. The synthesis strategy involved the preparation of PSt-b-PIB-Clt (i.e., dibloc…
Methacrylate-based copolymers with 2-hydroxyethyl methacrylate and 2,3-epoxypropyl methacrylate, respectively, were synthesised and investigated as costabilisers for PVC. It was found that these polymers are capable of improving the induction time of PVC dehydrochlorination. This costabilising effect is dependent on t…
The impedance response of poly( o ‐toluidine) (POT) electrochemically grown films was investigated in sulfuric acid 3.7 M, in the temperature range 218 to 293 K. The Nyquist diagrams as a function of temperature show that the transition potential from the nonconductive to the conductive state shifts in the positive po…
The introduction of rare-earth permanent magnets based on samarium-cobalt in about 1970, and neodymium-iron-boron magnets in the mid-nineteen eighties, has ushered in a new era in hard magnetic materials. This has resulted in a dramatic improvement in permanent magnet performance, with neodymium-iron-boron (Nd 2 Fe 14…
The crystal growth, structure and Raman spectra of the PrxY1−xAl3(BO3)4 (PYAB) single crystals are introduced. The experiments show that the characteristic lattice vibrational spectrum of the PYAB arises mainly from the internal vibrations of the BO3 and AlO6 groups, and that the rigidity of the lattice is mainly ascr…
We have used atomistic molecular-dynamics simulations to model the detailed molecular configuration of 5CB (4-n-pentyl-4'-cyanobiphenyl) molecules in the form of a nanoscopic liquid crystal droplet in a vacuum microgravity environment. We find the equilibrium state of droplets consisting of as few as 26 or 50 molecule…
Plates of polyethylene with ultrahigh molecular weight (PEUHMW) were treated by radiofrequency capacitive CF4 plasma discharge in order to incorporate fluorinated functional groups. The consequences of subsequent heating treatments after fluorination were investigated by the combined use of angle-resolved XPS characte…
The tetragonality of small zirconia particles has been established by accurately measuring the tetragonality ratio ( c/a ) of decomposed zirconyl hydroxide, which was then calcined over a range of temperatures to produce a range of average‐sized zirconia crystallite particles. The zirconia initially crystallized as a…
Abstract Remarkable luminescence of neodymium ion (Nd(III)) complexed with 8-quinolinol derivatives containing halogen atoms was successfully observed in organic solution under visible light irradiation via photosensitization. Introduction of halogen atoms in the ligands led to enhancement of the luminescence.
The vulcanization of carboxylated nitrile rubber (XNBR) with zinc peroxide, which produces ionic crosslinks, has been studied in relation to vulcanization time. Vulcanized compounds present two transitions, corresponding to the glass transition of the polymer at low temperatures and the ionic transition resulting from…
The development of several unique characteristics of volcanic soils is not yet as fully understood as the influence of topography on the pedogenesis of such soils. This study was conducted to explain the pedogenesis of consolidated volcanic rocks along a southeastern aspect of toposequence in the subtropical region of…
The present work aims at determining the dependence of the DC insulation resistivity on temperature and electric field for a super-clean low density polyethylene (LDPE) used in manufacturing modern high voltage AC cables. Resistivity measurements were made using relatively thick (/spl sim/2 mm) samples at different te…
The initial stages of Al(111) oxidation by oxygen were investigated by using x-ray photoelectron spectroscopy (XPS) and high resolution electron energy loss spectroscopy. It was found that surfaces exhibiting no impurities from the Auger electron spectroscopy and low-energy electron diffraction data may show different…