Materials Literature
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As a result of incompatibility, Eucalyptus gunnii showed in the graft area of in vitro micrografts a typical accumulation of gallic, ellagic, gentisic and p-coumaric acid: (+)-catechin also increased in concentration. In compatible grafts, a lower concentration of phenolics accumulated. The possible role of both speci…
Abstract 1,3-Disubstituted tetrabutyldistannoxanes effectively catalyze direct condensation polymerization of water-containing l-lactic acid to afford a high-molecular-weight polymer.
Visible light emission is obtained during anodic oxidation of heavily doped p‐type (P + ) porous silicon layers. Similar characteristics are observed for the electroluminescence (EL) on lightly doped substrates (P − ). This indicates that the coarser structure of the heavily doped samples also presents a thin structur…
Abstract The objective of this paper is to present a new method for analyzing SBR/BR blends in passenger tire tread compounds by thermogravimetric analysis. Since the base polymer of most tread compounds in passenger tires are normally either SBR or blend of SBR/BR, the importance of this method is self-explanatory.
Compressive properties of polycrystalline yttrium oxide (Y 2 O 3 ) were studied by slow‐strain‐rate experiments (ε= 5.7 × 10 –6 s −1 ) between room temperature and 1600°C. It was shown that Y 2 O 3 fails in a brittle manner up to 1000°C, and at 1200°C and above plastic deformation becomes dominant. Plastic deformation…
Joining of sintered Si 3 N 4 was performed using a high‐temperature brazing technique. Ni‐based brazing alloys having the same Ni:Cr ratio as AWS BNi‐5 (Ni·18Cr·19Si (at. %)) but different Si content were used as the brazing filler metals. Joining experiments were performed at 1220°C under a N 2 partial pressure of 15…
Macroscopic red algae were sampled simultaneously with diatom sampling from 60 locations in central Finnish rivers and at some rivers in south coast rivers in the summers 1986, 1993 and 1994. In those samples 17 red algal taxa from 5 genera ( Audouinella (3). Batrachospermum (7). Lemanea (4), Sirodotia (2) and Tuomeya…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation R. L. Sammler, J. U. Otaigbe, M. L. Lapham, N. L. Bradley, B. C. Monahan, C. J. Quinn; Melt rheol…
Glutamate synthase is a complex iron-sulfur flavoprotein containing one molecule each of FAD and FMN and three distinct iron-sulfur centers/alpha beta protomer. Production of the beta subunit was observed in total extracts of Escherichia coli BL21 (DE) cells harbouring a pT7-7 derivative carrying gltD, the gene encodi…
Structure and electronic states on the (100) surface of reduced BaTiO3 single crystals were observed by scanning tunneling microscopy and spectroscopy. After annealing at 1150 °C, the direction of the edges ordered to run along the equivalents of [011] and [001] directions. All the observed step edges were of unit-cel…
The interaction of mitochondrial aspartate aminotransferase with hydroxylamine and five derivatives (in which the hydroxyl hydrogen is replaced by the side chain of naturally occurring amino acids) was investigated by X-ray diffraction as well as by kinetic and spectral measurements with the enzyme in solution. The in…
The effect of new additives on the thermal conversion of a range of polyamic acids to polyimides at temperatures lower than 100°C was investigated using infrared spectroscopy. Additives such as m-hydroxybenzoic acid, p-hydroxyphenylacetic acid, and p-hydroxybenzenesulfonic acid were found to be highly effective as cur…
The thermal decomposition of Fe(CO)5, Cr(CO)6, Mo(CO)6, and W(CO)6 on Ni(100) surfaces and under ultrahigh vacuum conditions was studied by using temperature programmed desorption and x-ray photoelectron spectroscopies. The initial adsorption of those metal carbonyls is mostly molecular at low temperatures, but comple…
This work extends the results of previous workers on the influence of drawing on the crystallinity of PEEK and PEK to test temperatures well above Tg and to strain rates up to 103 s−1. The study thus includes measurement of crystallinity in samples tested in the strain rate regime where large increases in flow stress…
A range of substituted ferrocenes has been synthesized and studied for flame retardancy and smoke suppression on incorporation into plasticized PVC at 0.1–5.0 phr. Smoke suppression by up to 50 and enhancement of the limiting oxygen index by up to 4 units were observed. The differences in performance could not be corr…
In a recent Letter to the Editor (1995 Pure Appl. Opt. 4 1 - 5), the differential formalism of Chandezon et al (the C method) was extended to treat layered gratings in which the profiles of the medium interfaces within the same grating are different from each other. Numerical experiments have shown that a computer pro…
The ‘‘hyperfine magnetic field’’- Hhpf at the nuclei of the diamagnetic atoms 119Sn was measured in Heusler alloy Ni2MnSn by Mössbauer absorption spectroscopy for pressures up to 10.8 GPa at room temperature. The pressure dependences of HhpfSn does not show hysteresis and can be fitted by a linear function HhpfSn(P)/H…
The polymerization of isobutylene and styrene was studied using the 2-chloro-2,4,4-trimethylpentane/TiCl4 initiating system in the presence of a proton trap in halogenated hydrocarbons as solvents at −80°C. The polymerization of isobutylene was found to be living, and both homopolymers were soluble in n-butyl chloride…
Abstract Differences in processability between linear low denisty polyethylene (LLDPE) and low density polyethylene (LDPE) as well as for their blends subjected to extensional flow were assessed in terms of melt strength and elastic parameters from shear flow such as storage modulus (G′), and first normal stress diffe…
The thermal conductivities of two lithium aluminosilicate glass‐ceramic matrix composites reinforced with 30 vol% of either SiC VS (rice hull) whiskers or SiC VLS (vapor‐liquid‐solid) whiskers were determined from room temperature to 500°C. Because of the preferred alignment of the whiskers, the thermal conductivity v…