Materials Literature
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A study of the base-catalyzed alkylation of p-tert -butylcalix[5]arene ( 1 ) with 2-(chloromethyl)pyridine hydrochloride (PicCl·HCl) in DMF has led to the isolation and identification of the 7 possible pyridinyl homologues of 1 in the cone conformation. Reactions of 1 with limiting amounts of alkylating agent (2 to 4…
Ethylene-propylene elastomers (EPR and EPDM), which generate free radicals at considerable rate during gamma irradiation, show the competition between crosslinking and degradation of these materials in the temperature range from 130 °C to 150 °C. The overall effect of simultaneous processes on the studied polymers is…
The rate of zinc vaporization from galvanized scrap was measured using a thermogravimetric apparatus along with chemical analysis. It is found that the rate of zinc vaporization is very fast in nitrogen and carbon monoxide atmospheres at temperatures higher then 950°C. At lower temperature rate decreases with decreasi…
Cellular interaction and platelet adsorption were investigated on poly(ethylene oxide) (PEO) immobilized silicone rubber membrane (SR) which has polyacrylic acid grafts on the surfaces. Polyacrylic acid (PAA) had been introduced to the SR surface after Ar plasma treatment of SR surfaces to introduce peroxide groups. S…
Creep behavior has been investigated with high purity platinum (99.999 mass%) at high temperatures from 1373K up to 1773K. Stress and temperature dependence of the creep rate has been discussed in detail by using microscopic observations and X-Ray diffraction measurements. Platinum shows the power-law creep with the s…
V-t characteristics of spacer surfaces for VFT were investigated under particle contaminated conditions for gas insulated switchgear (GIS). V-t characteristics for VFT were measured with the particle length, oscillation frequency, amplitude, and damping factor of VFT waveform as parameters. Differences in V-t characte…
The electrochemical quartz crystal microbalance (QCMB) was applied to the study of amorphous La‐Ni thin film electrodes. Amorphous thin films were deposited on both AT and BT cut quartz crystal substrates by physical vapor deposition in ultrahigh vacuum. The electrochemical QCMB measurements determine the mass loading…
Poly(vinyl alcohol) dehydrogenase (PVADH) purified from Pseudomonas sp. 113P3 catalyzed an oxidation of poly(vinyl alcohol) (PVA) in the presence of pyrroloquinoline quinone (PQQ) to give a beta-diketone structure on PVA. Although PVADH oxidized not only enzymatically oxidized PVA but also chemically oxidized PVA, PVA…
We have investigated the influence of plasma pretreatment in various gases (Ar, NH3, N2) on the adhesion of plasma-deposited silica layers to polypropylene (PP). UV-visible ellipsometry measurements enabled us to detect crosslinking at the polymer surface. All treatments, and especially the Ar-diluted N2 treatment, in…
An optimal in situ hybridization protocol is described for the detection of gene expression of a structural protein unique to lampreys, lamprin, in the cartilages of prolarval, metamorphic and adult sea lamprey, Petromyzon marinus. A 156 bp antisense RNA probe labeled with (35)S-UTP was transcribed in vitro from a rec…
Diffusion coefficients for hydrogen in titanium, its alloy Ti88Al12 and the intermetallic Ti3Al have been measured in the temperature range 873–1298 K. It has been found that the activation energy for diffusion in Ti3Al (0.84 eV) is nearly twice that in titanium (0.45 eV), and in Ti88Al12(0.57 eV) it is closer to that…
The behaviour of heterobifunctional reactive dyes, containing a monochlorotriazine and a vinyl sulphone group, on silk has been investigated. Maximum exhaustion and fixation were obtained in a neutral medium at 90d̀ C. The addition of sodium sulphate was found to promote the exhaustion of reactive dyes at p H values a…
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Abstract Corrosion fatigue refers to the phenomenon of cracking in materials under the combined actions of fatigue loading and a corrosive environment. This article focuses on the various mechanisms of corrosion fatigue, namely, hydrogen-assisted cracking, anodic dissolution, and surface energy reduction. It discusses…
Die Bildung der unterschiedlichen Kristallmodifikationen bei der diskontinuierlichen Fällung von Calciumcarbonat aus Natriumcarbonat- und Calciumnitratlösungen wurde untersucht. Die Konzentration der Ausgangslösungen, die Vermischungsart und die Temperatur wurden variiert. Aus den Ergebnissen werden Modelle für die Bi…
This article discusses the formation of extruded thermoplastic foam sheet due to expansion of supersaturated physical blowing agent while it exists from a high-pressure flow region into atmospheric surroundings. Swarms of tiny gas cavities of unstable nature are formed and gas diffusion virtually promotes expansion, t…
Electromigration testing of integrated circuit metallizations requires the use of accelerated testing. Accurate extrapolation to circuit operating conditions requires a thorough understanding of the impact of the accelerated stress conditions on the parameters of the failure distribution. In this paper we examine the…
A modified Freeman–Murray–Richards (FMR) correlation for the analysis of 59Co NMR shielding parameters, δ(59Co)vs.(Δv*1/2)1/2/ΔEav, is formulated by combining the Ramsey shielding theory and the Townes and Dailey theory for the calculation of the nuclear quadrupole coupling constant. It is demonstrated that the experi…
The New Zealand solitary ascidian Pyura pachydermatina (Phylum Chordata, Subphylum Urochordata) is a sessile filter feeder in rocky wave-swept coastal areas. The body is on a long stalk; both are covered by a tough fibrous tunic. Two types of spicules are formed in vascularized areas: "antler-shaped" branched spicules…
Conflicting observations have been reported about redoximorphic features in soils derived from red Triassic sediments. Previous laboratory research has shown that development of redoximorphic features is sometimes inhibited in these sediments. Soil morphological descriptions made under the auspices of The National Coo…