Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Activated Carbon-Steam ReactionHerbert E. Klei, James Sahagian, and Donald W. SundstromCite this: Ind. Eng. Chem. Process Des. Dev. 1975, 14, 4, 470–473Publication Date (Print):October 1, 1975Publication History Published online1 May 2002Published inissue 1 O…
The semi-continuum model of the lattice dynamics of layer crystals devised by Komatsu for application to graphite is here applied to hexagonal boron nitride. It is found that the thermal expansion coefficient αc parallel to the hexagonal axis is determined almost completely by the out-of-plane acoustic vibrational mod…
Thomas A. Carlson, The Nature of Secondary Electrons Created as the Result of Electron Shake-Off and Vacancy Cascades, Radiation Research, Vol. 64, No. 1, Symposium on the Distribution of Secondary Electrons from Ionizing Collisions (Oct., 1975), pp. 53-69
A six-dimensional integral in the coordinate space of two particles 1 and 2, where the integrand contains Coulomb functions for both the particles, the term $\frac{1}{|{\stackrel{\ensuremath{\rightarrow}}{\mathrm{r}}}_{1}\ensuremath{-}{\stackrel{\ensuremath{\rightarrow}}{\mathrm{r}}}_{2}|}$, and an exponential term, i…
The normal vibrations of crystalline trans-1,4-polybutadiene have been calculated by combining interchain atom-atom potentials with the previously proposed intrachain force field. These calculations have been used to analyze the infrared and Raman spectra of an essentially all-trans urea-complex polymer. The band spli…
Abstract The assignment of the Raman frequencies from 200 to 1800 cm −1 has been made taking into account the values calculated by Brandmüller et al. for a planar molecule since only the H atoms of NH 2 are out of the plane. In the crystal the V line is unusually weak and the 1276–1284 cm −1 broad band is extremely st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarized crystal spectra of potassium tetrachloropalladate(II) and potassium tetrabromopalladate(II)Rhonda M. Rush, Don S. Martin, and Roger G. LeGrandCite this: Inorg. Chem. 1975, 14, 10, 2543–2550Publication Date (Print):October 1, 1975Publication History Published online…
Abstract Glauconite-smectite and illite-smectite interlayered minerals are compared by various means in an attempt to establish the mineralogical relations between the two groups. Experiments at 2 Kb pressure and 200–350°C are reported as well as microprobe scans of pelletal glauconites. This new information is used a…
The magnetic susceptibitlity of 243AmO2 from 2.2 to 97 °K. The sample showed an antiferromagnetic transition at 8.5±0.5 °K and to regions of temperature-dependent paramagnetism above 15 °K. (AIP)
The growth of Brucella abortus (US-19) in a complex tryptose-yeast extract medium containing D-glucose is inhibited by 10 mM erythritol. The enzymes of the erythritol pathway, except for D-erythrulose 1-phosphate dehydrogenase (D-glycero-2-tetrulose 1-phosphate:nicotinamide adenine dinucleotide (NAD+) 4-oxidoreductase…
Summary Using the acetylene reduction technique, nitrogen fixation was measured in Rocky Creek, a small seasonally dry Californian stream. In the 3 years since 1970 nitrogen fixation varied seasonally and spatially, being highest in the early stages of colony growth in shallow, clear regions where there was little sha…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
The ESR spectra of ${\mathrm{Rb}}^{+}$TCN${\mathrm{Q}}^{\ensuremath{-}}$, of ${\mathrm{K}}^{+}$TCN${\mathrm{Q}}^{\ensuremath{-}}$, and of TM${\mathrm{B}}^{+}$ (tri-methyl-benzimidazolium) TCN${\mathrm{Q}}^{\ensuremath{-}}$ were measured. The observed dipolar splittings unequivocally prove that the ESR signals derive f…
A number of polytypes, existing over short intervals of structure, have been observed in enstatites. These include the27,36, and 54 A periodicities, in addition to the well known 9 A monoclinic enstatite (CLEN) and l8 A orthorhombic enstatite (OREN) polymorphs. The polytypes, as well as all other features described in…
Abstract New developments on photochromic polymers have been obtained with systems containing spirobenzopyran derivatives. The importance of the chemical incorporation of the photochrome within the polymer backbone is stressed, and the influence of matrix orientation on the rate of fading is shown. Well known fatigue…
Abstract The crystallinity of minerals in terms of crystallite size distribution and lattice perfection is quantified by means of statistical measures derived from X-ray line profiles (2 σ values). A low degree of crystallinity facilitates the non-stoichiometric incorporation of foreign elements in the crystal lattice…
This paper presents a classification scheme for tetrahedrally-coordinated oxides of formulae Li 3 XO 4 : X = P, As, V, Cr, Mn; AYO 2 : A = Li, Na; Y = Al, Ga, Fe, (not LiFeO 2 ) and A 2 BCO 4 : A = Li, Na; B = Be, Mg, Mn, Fe, Co, Zn, Cd; C = Si, Ge, (not all ABC combinations). These oxides are usually polymorphic and…
A previous calculation of the band structure of trigonal V2O3 and Ti2O3 by Nebenzahl and Weger is improved, taking a more rigorous treatment and including the effect of covalency. The agreement obtained with experimental results is good. It is found that the width of the 3d band is about 9 eV for V2O3 and 11 eV for Ti…
The superstructure of PPO/iPS blends, in which the iPS is partially crystallized from the glassy state by thermal treatment, is studied as a function of composition. A superstructure model, based on Hosemann’s treatment of a linear paracrystalline lattice, is used in order to calculate theoretical SAXS curves and fit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilute single-crystal electron paramagnetic resonance study of bis(cyclopentadienyl)vanadium pentasulfide, V(.eta.5-C5H5)2S5. Coup de grace to the Ballhausen-Dahl bonding model applied to M(.eta.5-C5H5)2L2-type complexesJeffrey L. Petersen and Lawrence F. DahlCite this: J. A…