Materials Literature
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We report experimental studies of the statics and dynamics of diffusion-limited polymerization. The fractals obtained were produced electrochemically from neutral precursors, and have a Hausdorff dimension of 1.74\ifmmode\pm\else\textpm\fi{}0.03. The width of the active growth zone increases at the same rate as the fr…
Abstract Dipole relaxation dielectric loss behavior of a fiberglass–epoxy composite has been studied as a function of moisture uptake. A single widely distributed loss peak, centered at −16°C for 10 kHz measurement, is observed in the dry composite. Very low moisture concentrations (<0.1%) interact with the composi…
We suggest that dendritic sidebranches may, under some circumstances, be generated by selective amplification of noisy fluctuations near the tip. Our proposal is based on numerical and analytic studies of the dynamics of the two-dimensional boundary-layer model with kinetic crystalline anisotropy. Certain features of…
Abstract not Available.
We obtained the first σ∗-values and Es -values for siloxy groups by spectroscopic and kinetic methods. Detailed mechanistic investigations are performed on the hydrolysis of chlorosiloxanes, the cleavage of Si[sbnd]O[sbnd]Si bonds by HCl, and the substituent exchange reaction between silanols and chlorosilanes.
Thin film induced stresses on silicon substrate were measured at room temperature, using a stress gauge wafer deflection setup. The thermal oxide was in high compressive stress due to CTE mismatch between oxide and Si substrate. As deposited PSG was in tensile stress decreasing in stress level with increasing P conten…
Abstract High temperature curing is feasible with adequate curative modifications. NR-containing compounds are prime considerations. Cure time reductions of about 35% or more are entirely within reason. Use of the modified compounds at conventional or low curing temperatures makes possible significant improvements in…
An account is given of the determination of the thermophysiological properties of two blankets, one made from wool and the other from an acrylic-fibre–cotton blend but otherwise matched in weight and fibre diameter, by laboratory measurements as well as by climatic-chamber tests with human subjects. The tests show tha…
Abstract A recent study by the authors of the effects of pH and organic acids on residual orthophosphate solubility in an acidic, montmorillonitic soil (Typic Chromoxererts) was extended to include variations of ionic strength (NaCl background) and Ca 2+ concentration at fixed ionic strength. The objective of the expe…
Potential‐controlled electrochemical methods were used to characterize the pitting behavior of 6061 alloy aluminum in synthetic ocean water. Irreproducible breakdown potentials (Ebd) and reproducible repassivation potentials (Erp) were determined from cyclic anodic polarization (CAP). Reproducible breakdown and repass…
The analysis of the STS‐7 flight experiments of the system yielded positive results which surpass the original objectives of these experiments. The mass transport rates of observed in microgravity environment are in close agreement with theoretically predicted values for diffusion limited mass transport. This supports…
Rates of cell volume increase in individuals of five genera of centric marine diatoms were measured using time-lapse video microscopy. In continuous light, size increased continuously in Thalassiosira weissflogii and Lauderia borealis, while steps were observed during the growth of Stephanopyxis turris, Biddulphia aur…
Domain control has been applied to amorphous metal ribbon by mechanical and laser scribing. Mechanically scribed lines were made using a number 88 tungsten carbide scriber with minimum applied pressure. The scribing interval was varied from 0.6 to 10 mm. Laser scribing was performed by using a well-focusedQ-switch YAG…
Abstract not Available.
The lifetimes of the lowest energy excited states of V(bpy)32+ (bpy = 2,2/-bipyridine) and V(phen)32+ (phen = 1,10-phenanthroline) are 500 ps and 1.8 ns, respectively, in ethanol at room temperature. These lifetimes are much shorter than those for the isoelectronic chromium(III) complexes. The lowest energy excited st…
The kinetics of dissolution of powdered bovine enamel and of human enamel, both untreated and extracted with either hypochlorite or chloroform, has been studied using a constant solution composition technique in undersaturated solutions of calcium phosphate (total molar calcium concentration, TCa = 0.3 to 13.1 X 10(-3…
Tritium interactions with graphite will influence the design of procedures for handling graphite components. The tritium sorption capacities of various graphite grades are therefore needed. In a series of measurements, several graphite specimens in different states of oxidation were exposed to tritium gas and to triti…
Abstract Erstmals in Form von Einkristallen wurden Li 8 IrO 6 (dunkelviolett, a = 541,51, c = 1505,84 pm), Li 8 PtO 6 (gelbgrün/transparent, a = 541,46, c = 1501,43 pm) sowie Li 8 CeO 6 (farblos/transparent, a = 564,30, c = 1602,71 pm) röntgenographisch untersucht. Der Madelunganteil der Gitterenergie, MAPLE, sowie Ef…
Hydroxypropyl cellulose (HPC) forms liquid-crystalline solutions in both water and methanol. When these solutions are sheared, the banded texture seen in many liquid-crystalline polymers is formed. Detailed optical microscopy of the bands has been carried out, showing that the bands arise from a smooth variation in th…
The annealing of sintered (MnZn)Fe2O4in a controlled atmosphere improves the apparent electrical resistivity through the reduction of the ferrous ion content. The initial permeability, however, is degraded as a result of annealing. It is suggested that stringent control of the oxygen partial pressure at an earlier sta…