Materials Literature
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The temperature dependence is measured from 4 to 40 K of the frequency of tunnelling rotation of methyl groups in free radicals in gamma -irradiated methyl malonic acid crystals. Above 25 K the frequency, while remaining well defined, declines sharply with increasing temperature.
For pt.I, see ibid., vol.7, 76 (1974). Small (18-32 atoms) periodic clusters of two-dimensional hexagonal graphite and boron nitride are shown to represent some high-symmetry points in the Brillouin zone of the infinite crystal. Semi-empirical all-valence electron calculations are performed on these clusters and the b…
Using a light-beating spectrometer, we have observed in the smectic-$A$ phase of $p$-cyanobenzilidene-$p$-octyloxyaniline the thermally excited undulations of layers predicted by de Gennes. From the wave-vector dependence of their damping time we determined the diffusivity of the angular orientation, $\frac{{K}_{1}}{\…
A LEED pattern given by a thin film of gold deposited on the (111) surface of a silicon crystal shows an unusual combination of spots and lines. It is suggested that the structure is essentially two-dimensional, with lattice points regularly spaced along certain lines, but with adjacent lines randomly either in phase…
The structure of solid solutions of ZrO 2 containing 18%, 22% and 26% YO 1.5 as well as 26% YbO 1.5 have been examined by Bragg neutron diffraction and the diffuse scattering of long wavelength (7 AA) neutrons. The evidence points to a relaxation (0.36 AA) of the six nearest-neighbour oxygen ions surrounding an anion…
The most complex types of nitrogen compound in beer (here termed “proteoses”) are, when not combined with polyphenols, highly surface active and hence concentrate in the foam. With unhopped beer, the foam is of the “liquid-viscous” type, which eventually drains and collapses leaving no residual solids. The iso-α-acids…
Phase relations in the system ZrSiO4-TiO2 was investigated by a quenching method. Mixtures of ZrSiO4 and TiO2 were heated from 1500° to 1700°C in air with silicon carbide heating element furnace. Phases in the quenched specimens were identified by a X-ray diffraction method and also under a reflecting microscope. TiO2…
The defective spinel in the system RO⋅Al2O3-Al2O3 at the lower temperature below about 1100°C, was synthesized, and it was named as γ-spinel and its meta-stable region was explanatorily draw by G. Yamaguchi in 1953.In the present investigation, this phase boundary has been revealed experimentally by the X-ray diffract…
W ith the aim of p roducing a reducing gas of(CO. + H .O):O;;7o o and the soot cOlltent less thall 5 g/Nm 3 at a low cost by reforming gaseous hydrocarbon with C O 2 and H 2 0 contained ill the blast furnace tOll gas, the effects of the retentioll time, the reaction temperature and catalysts were checked by carrying o…
The demands for electrical power generation capacity have increased significantly in recent years. This paper covers the manufacturing of uranium dioxide nuclear fuel (UO2), for use in commercial nuclear reactors presently used for electric power generation. It explains in detail, the manufacturing and processing step…
Environmental and fallout gamma radiation protection factors (PF's) were estimated for a variety of civilian transportation vehicles using measurements of the natural terrestrial radiation as a source. The PF values are below 2 in light vechicles, truck beds, or trailers; from 2.5 to 3 in the cabs of heavy trucks and…
Abstract The sulfonation of polyamides (Nylons‐3,6,11 and 6,6) was investigated using fuming sulfuric acid and solutions of SO 3 in CCl 4 . The sulfonated polymers were soluble in water and insoluble in ethanol. Acid hydrolysis of the polymers and quantitative determination of the amino acids in the hydrolysate showed…
End-breakage is assumed to occur in the fiber bundle which forms a triangle zone between a front roller nip line and a twisting point. On the this assumption a theoretical investigation into end-breakage encountered during spinning has been made together with such factors as tension, yarn irregularity, number of fiber…
A discussion of the factors which have produced the remarkable growth in the use of polyurethane-coated fabrics, and of the factors which influence their properties. The latter includes a description of the various techniques used in the manufacture of PU-coated fabrics and of the way in which variations in manufactur…
Abstract A study has been made of the marked effect of solvent on the stereoregularity of poly (methacrylic acid) prepared by the radical polymerization of methacrylic acid initiated by Co 60 gamma radiation. The specific interaction of the solvent with the monomer and the growing polymer chains, leading to particular…
In the present investigation we attempt to probe the electronic properties of the RCo5 compounds by x‐ray photoelectron spectroscopy studies of SmCo5 and PrCo5 and endeavor to relate the results to the properties of the pure metals and to the picture developed to describe the magnetism of the compounds. The results in…
Ni–Fe–Nb alloys were vacuum melted, annealed in hydrogen atmosphere over the temperature range 950 to 1350°C and then cooled at various rates from a temperature above their order-disorder transformation points. Measurements of magnetic properties, electrical resistivity and hardness for the alloys showed that the valu…
Water-soluble films of cellulose nitrate-nitrite were prepared by dissolving bleached sulfite pulp in a solution of nitrogen dioxide in dimethylformamide (DMF) at room temperature and heating the solution at 70°C for about 3 hr. Their water sorption, fine structure, and electrical properties were measured and compared…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray powder data and unit cell parameters of magnesium chloride hexahydrateCharles A. Sorrell and Roy R. RameyCite this: J. Chem. Eng. Data 1974, 19, 1, 31–32Publication Date (Print):January 1, 1974Publication History Published online1 May 2002Published inissue 1 January 19…
The electron microprobe (EMP) is an electron optical instrument in which compositional and topographic information are obtained from regions ⩽1μm in diameter on a specimen. Photographs of compositional and topographic changes in 1-mm2to 20-μm2 areas on various types of specimens can also be obtained which are striking…