Materials Literature
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An anomalous rate minimum exists at about 400 °C for the oxidation of plutonium, i.e., there is a decrease in the oxidation rate as the temperature is increased toward the rate minimum. In situ X-ray diffraction studies have shown that in the temperature region of the rate minimum, there is an increased rate in the fo…
Abstract Tail regeneration occurs following autotomy of the tail in the salamander Desmognathus fuscus. Studies based on histology and autoradiography suggest that the cells of the regeneration blastema arise from the connective tissue of the tail stump. Following autotomy of the tail in Desmognathus the muscle of the…
The effective Hall mobility is calculated for a material containing inclusions which have a conductivity and Hall mobility differing from those of the matrix in order to investigate whether Hall-effect-Seebeck-effect anomalies can be explained by the presence of inclusions. The calculation is performed analytically us…
The requirements for a transmission stage for the scanning electron microscope (SEM) are discussed, and an advanced stage meeting this demand is described. Examples are shown of high resolution micrographs and selected area diffraction patterns obtained using the stage.
Four peaks were observed in the differential primary weight loss with temperatures up to 1,000 C. The first and second peaks correspond to the loss of water and the volatilization of protein. The third peak results from the carbonate. The fourth peak, which occurs at 700 to 800 C, probably is related to the transforma…
Abstract Calcium salts of analogues of dipicolinic acid were substituted for calcium dipicolinate in tests of germination of spores of Bacillus megaterium ATCC 10778. Only 4H-pyran-2,6-dicarboxylic acid was as active as dipicolinic acid. 3-Methyldipicolinic acid and 4-methyl-4H-pyran-2,6-dicarboxylic acid were active…
The room-temperature elastic constants of a pyrolytic graphite were measured by an ultrasonic transmission technique and compared with values calculated on the basis of the constant strain and constant stress models from the elastic constants of compression-annealed pyrolytic graphite (CAPG). It was found that the con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis of Poly(organophosphazene) Copolymers and Cross-Linked Polymers by Ligand ExchangeH. R. Allcock and G. Y. MooreCite this: Macromolecules 1972, 5, 2, 231–232Publication Date (Print):March 1, 1972Publication History Published online1 May 2002Published inissue 1 March 197…
A number of new Schiff's bases showing nematic mesomrophism of low thermal stability (to below O°C) were found to also deviate somewhat from known compounds in the relation of transition temperatures to substituent chain variations in their homologous series. Besides a tendency towards rising nematic-isotropic transit…
Summary The oxidation of amosite, crocidolite, and biotite has been determined at temperatures up to nearly 900 °C under both a vacuum (10 −2 mm Hg) and oxygen (10 and 600 mm Hg). Infrared spectra gave the loss of constitutional hydroxyl under these conditions. The loss of tensile strength of the amphiboles with incre…
Summary The way pH changes in soil are propagated by movement of acids and bases is described. In acid soils the H 3 O + ‐H 2 O acid‐base pair is most important, while in alkaline soils the H 2 CO 3 ‐HCO 3 − pair is always dominant, its effect depending directly on the pressure of CO 2 . In neutral and slightly acid s…
The Raman scattering of the 93 cm−1 anomalous mode in NH4Cl above and below the λ-transition temperature (Tλ) was studied in detail. The peak and integrated intensities of this mode decrease rapidly to zero below Tλ. In contrast to the temperature behavior of a similar mode in NH4Br, the intensity data does not follow…
The shift in the position of a number of exciton peaks seen in the spectra of the layer type transition metal dichalcogenides has been measured in a hydrostatic pressure apparatus capable of reaching pressures up to 6 kilobars, in the temperature range 80°K to 295°K. For the Group 6 materials MoS2 and WSe2, the magnit…
The effects of porosity on the deformation characteristics of sintered polycrystalline UO 2 were determined at 500°, 1250°, and 1600°C at a strain rate of ∼0.1 h −1 . At 500°C, fracture was brittle and transgranular and initiated from the large pores present after fabrication. An increase in porosity from 5 to 16 vol%…
Abstract The relative photochemical reactivity of α-diketones, in particular, 9,10-phenanthraquinone, 1,2-naphthoquinone, acenaphthoquinone, benzil, 4,4′-dimethylbenzil, 2,4,6-trimethylbenzil, 2,5,2′,5′-tetramethylbenzil, 2,3,5,6-tetramethylbenzil, 2,4,6,2′,4′,6′-hexamethylbenzil, phenylglyoxal, 2,5-dimethylphenylglyo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of porous layer open tubular columns by the dynamic methodJ. G. NikellyCite this: Anal. Chem. 1972, 44, 3, 623–625Publication Date (Print):March 1, 1972Publication History Published online1 May 2002Published inissue 1 March 1972https://pubs.acs.org/doi/10.1021/ac…
Abstract Intensity measurements of visible light and x‐rays and linewidth measurements of visible light scattered by one, two, and multicomponent systems for various equilibrium states in the neighborhood of the critical point are reviewed. By combining the angular dependence of the scattered intensity with that of th…
Abstract The proper use of lubricants and other additives in the compounding of PVC is hampered by lack of knowledge of their interactions with the polymer. Differential scanning calorimetry has been applied to measure the effect of ingredients on the glass transition temperature of PVC. An interaction parameter, base…
A theoretical treatment of nucleation-controlled polymer crystal growth is developed. A distinction is made between the end-surface energy of the crystal lamella and that of the nucleus for growth. The growth rate is related to the nucleation frequency using a thick-crystal treatment, and the lamellar thickness is vie…
Some allophanic soils in Japan, developed from deposits of volcanic ashes have aggregates, the sizes of which are mostly those of silt and sand, and which are very stable against the ordinary soil dispersion treatment such as decomposition of organic matter with hydrogen peroxide and addition of deflocculants to the s…