Materials Literature
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X-ray photoelectron spectroscopy was used to analyze a 1 cm2, 0.13 mm thick coupon of polytetrafluoroethylene (PTFE). The material was examined as received from the manufacturer following a cleaning with isopropyl alcohol and trichlorotrifluoroethane. The PTFE coupon was examined with a Hewlett-Packard 5950B ESCA syst…
The crystal structure of 1,4-dibromocubane has been determined by X-ray diffraction. The crystal is monoclinic, P2 1 /n, a = 6.878(1), b = 6.960(7), c = 8.793(2) Å, β = 113.08(2)°, Z = 2, R = 0.055. The C—Br bond length, at 1.926 Å, is shorter than usual and the carbon framework is probably distorted by longer bonds a…
t Introduction Silk consists mainly of fibroin and sericin along with very small amounts of waxy substances, mineral salts and colouring matter. The sericin is also referred to as silk gum and its removal is, therefore, called degumming. The sericin is removed by hydrolytically breaking it into smaller water-soluble f…
The authors discuss stator winding deterioration mechanisms and their consequences. Inspection and test procedures which will detect these mechanisms, as well as programs to arrest them, are also discussed. The analysis is broken down into sections on the slot region of the stator winding and on the end winding region…
It is noted that the moving model and the product model have different variations in the height of minor loops and thus a means of differentiating between the models. Measurements show that, for particulate magnetic recording media, the moving model yields more realistic results and that previous reversible magnetizat…
We have studied a process for filling narrow spaces between adjacent metallic conductors (gaps). The process consists of cycles of deposition of by plasma‐enhanced chemical vapor deposition (PECVD) and sputter etching in Ar. For a fixed process and metal thickness, as the gaps decrease in size, i.e. , as the aspect ra…
To help resolve unknowns regarding consequences of air-ingress accidents in uranium beds, a series of experiments was conducted at Ontario Hydro Research Division with the participation of Princeton Plasma Physics Laboratory and the Idaho National Engineering Laboratory. These experiments involved exposure of uranium…
After a discussion of the thermochemical values of the Si–H–Cl–N system which occur in the literature, CVD phase diagrams are presented which include contours of constant deposition efficiency. The temperature range considered is from 800 to 2600 K. A number of chlorinated silanes as well as silane can be used as a si…
A three-dimensional linear analysis of transient patterns occuring during the splay Freedericksz transition is presented including contributions relevant for the electrically driven case. The most rapidly growing modes have a wave vector predominantly along the initial directore alignment. The onset of the pattern for…
Abstract Innerhalb der triklinen Elementarzelle, Raumgruppe P 1 , mit den Gitterkonstanten a = 5,2794(1) Å, b = 9,9279(1) Å, c = 11,3376(2) Å, α = 71,004(4)° und β = 74,601(4)° befinden sich zwei Formeleinheiten. Das den Strukturaufbau charakterisierende dreidimensionale Netzwerk resultiert aus sp 3 ‐hybridisierten Di…
Zirconium cobalt (ZrCo) is being evaluated as an alternative to uranium for tritium storage. The pumping speed and pressure-composition-temperature isotherm profiles for the ZrCo hydrogen and tritium systems were measured to determine isotopic differences and the effect of He-3 induced aging on ZrCo performance. Hydro…
A formulation is presented for the inclusion of segmentation effects in a three-dimensional eddy current model of large laminated iron cores. The model has been developed for the study of eddy currents induced in the end laminations of turbogenerator stator cores. It includes magnetic nonlinearity and represents the o…
Spanning nearly 5000 years of textile history, this book covers the field from the first practical and decorative use of fabrics to the introduction of modern synthetic materials. Organized in an A to Z format, the work provides information on fabric, fabrication methods, machine processes (felting, weaving) and more.…
Abstract Flexural test specimens were injection-molded from random and block polypropylene copolymers with various ethylene contents at cylinder temperatures of 200 to 320°C. Properties such as flexural modulus (FM), flexural strength (FS), heat distortion temperature (HDT), Izod impact strength (IIS), and mold shrink…
Abstract The temperature dependence of the interfacial dielectric loss process in glass bead‐filled high density polyethylene (HDPE) due to an interfacially adsorbed water layer has been studied. The frequency of maximum dielectric loss shifts to lower frequencies with decreasing temperature. This is thought to be due…
A series of 5-[(arylcarbonyl)amino]- and 5-(arylcarbamoyl)pyridine-2-carboxylic acids has been prepared and tested for activity as inhibitors of the enzyme prolyl 4-hydroxylase (EC 1.14.11.2). All the analogues prepared were inhibitors of the enzyme in vitro, the best compounds being equipotent with the known inhibito…
Abstract X-ray powder data and refined cell parameters for two titanium carbonitride solid solutions are presented. Some deviations from Vegard's law were observed.
To verify the performance of permeation-resistant cladding for tritium targets designed for a New Production Reactor Light-Water Reactor, a tritium test facility was designed, developed, fabricated, and certified. Testing is ongoing to verify the performance of reference-designed targets. Accurate measurements were ta…
A revised model for the corrosion behavior of pure chromium has been developed. This model applies to both polycrystals and single crystals. The model has been developed using results from polarization and impedance measurements. In the revised model, the observed diffusion controlled process has been ascribed to surf…
One of the most striking manifestations of instability in solid mechanics is the localization of shear strain into narrow bands during high speed, plastic deformations of metals. According to one theory, the formation of shear bands is attributed to effective strain-softening response, which results at high strain rat…