Materials Literature
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Graphite contains varying concentrations of screw dislocations whose Burgers vector parallels the c axis. Single crystals of natural graphite contain very few such dislocations; furthermore, their Burgers vector always exceeds 450 angstroms. Pyrolytic graphites annealed above 3000 degrees C contain abundant screw disl…
Abstract Measurements of thermal conductivities of a number of pyrolytic graphites are reported including values for annealed, hot pressed graphite (IFPA 57). Thermal conductivities of IFPA 57 in both basal plane and c-axis directions approach the values for ideal graphite at higher temperatures. A theoretical estim…
Abstract Aus kleinen Ringen aufgebaute Polycyclen sind seit einigen Jahren bekannt. Ihre auch theoretisch interessanten chemischen und physikalischen Eigenschaften werden erläutert und Darstellungsmethoden an einigen Beispielen gezeigt. Besonders besprochen werden die Kohlenstoff‐Gerüste wie sie das Tetraeder, das Dew…
The average potassium oxide content of 18 Paleozoic two-layer monoclinic illites is 8.75 percent. There is an excellent linear relation between the ratio of the intensities of the reflections at 10 angstroms and 5 angstroms (10 A/5 A) and the potassium oxide content. The frequency distribution curve of the 10 A/5 A in…
Optically active amino acids contain many highly efficient optical second-harmonic generators. When light from a ruby laser at 6943 A falls on the crystalline amino acids with sufficient intensity, the second harmonic of the light at 3471 A can be observed. Although the symmetry requirements for optical second-harmoni…
Abstract The oxidative degradation of poly(ethyl acrylate) was investigated by infrared spectrophotometric techniques, and the volatile degradation products were determined by vapor‐phase chromatographic analysis. During the course of degradation, no change in the spectrum of the polymer, indicating the formation of o…
It is well known that the insulating ability of fabrics, singly, or in layers of clothing, may be towered sub- stantially if the clothing becomes wet, for example, from rain penetration.According-Iy.all-weather garments
Dynamic mechanical measurements were made with a low frequency (similar 1 c/s) torsion pendulum at temperatures from -170 to 150°C, on thin polytetrafluoroethylene (PTFE) sheet irradiated in vacuum at 23°C with doses up to 5 megarads of gamma radiation. Marked radiation-induced increases in shear modulus and decreases…
Orotidine-5′-phosphate pyrophosphorylase was isolated from wheat embryos and purified 35-fold. The enzyme is inhibited by high concentrations of orotate. Cu ++ and Mn ++ ions can replace the Mg ++ ion requirement. The enzyme shows a primary and secondary optimum at pH 8.5 and 9.8. Dihydro-orotate:NAD dehydrogenase als…
Abstract It is possible to draw analogies between linear polymers and cyclic compounds. Stereochemical considerations developed in this connection led to the recognition of new aspects of importance for the systematic classification of both classes of compounds; for example, asymmetric structures can be predicted whic…
Cotton print cloth (68 X 72) has been treated with aqueous solutions of dihydroxy ethyleneurea (DHEU) and several of its derivatives in the presence of inorganic catalysts at constant molar concentration of the metallic ion. The derivatives were N,N'-dimeth yloldihydroxyethyleneurea (DMDHEU), a dioxane complex of DMDH…
Abstract Polyclic compounds consisting of small rings have been known for several years. Their chemical and physical properties, which are of both theortical and practical interest, are discussed, and methods of preparation of a few examples are illustrated. The carbon skeletons of tetrahedrane, Dewar benzene, prisman…
It is shown that after brief neutron irradiation the elastic constants of polycrystalline reactor graphite are reasonably consistent with the single crystal values in a uniform stress (Reuss) approximation. A method is proposed for dealing with the anisotropy of the polycrystalline aggregate by reference to the coeffi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes of the Lanthanide Elements with α-Picolinate and α-Picolinate N-Oxide IonsH. Yoneda, G. R. Choppin, J. L. Bear, and A. J. GraffeoCite this: Inorg. Chem. 1965, 4, 2, 244–246Publication Date (Print):February 1, 1965Publication History Published online1 May 2002Publis…
Field measurements were recorded of water table, Eh, moisture, and temperature for three members of the Uplands catena throughout 2 years. Samples of the Orthic Podzol (Uplands), Gleyed Orthic Podzol (Rubicon), and Orthic Gleysol (St. Samuel) were analyzed.High Eh values (above 600 mv) and a water table below 4 ft pre…
The ${\mathrm{V}}^{51}$ NMR frequency shift ($\frac{\ensuremath{\Delta}\ensuremath{\nu}}{\ensuremath{\nu}}$) in metallic ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ has been measured in the temperature range of 175 to 575\ifmmode^\circ\else\textdegree\fi{}K the frequency shift at these two temperatures being -0.61% and +0.1%…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIMMERSIONAL WETTING OF SOLID SURFACESA. C. ZettlemoyerCite this: Ind. Eng. Chem. 1965, 57, 2, 26–36Publication Date (Print):February 1, 1965Publication History Published online1 May 2002Published inissue 1 February 1965https://pubs.acs.org/doi/10.1021/ie50662a005https://doi.…
The smooth, nearly Gaussian, optical absorption band of $F$ centers in most alkali halides contrasts with that observed at low temperatures in the cesium halides, where two or sometimes three components are partially resolved. A strong spin-orbit coupling could account for two components, but the third has remained a…
The emission spectra of the tris and tetrakis forms of four β-diketone chelates of europium were studied in the solid powder, and in alcohol solution with and without dimethylformamide added. Partial dissociation of the tetrakis form was observed in solution. Effective site symmetries, subject to steric distortion, we…
Electron spin resonance data for [VOCl5]3— and [MoOCl5]2— in dilute single crystals are reported and and analyzed to give the spin Hamiltonian parameters for these complexes. A molecular orbital formulation is given for the spin Hamiltonian parameters, and terms dependent on spin—orbit interactions near ligand nuclei…