Materials Literature
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Abstract Die Optik gehört zu den ältesten Teilgebieten der Physik und hat zu deren Entwicklung immer wieder entscheidend beigetragen. In der ersten Hälfte dieses Jahrhunderts wurde die Optik durch die aufregenden Entwicklungen in der Quantenmechanik und Elementarteilchenphysik etwas in den Hintergrund (und aus vielen…
Abstract The use of Fe–Mn–Al–C alloys in oxidizing–sulphidizing environments at elevated temperatures is considered. Applications of SEM, EDX mapping and x‐ray diffraction techniques to the microstructural characterization of the scale development on these alloys are reviewed. Combination of the electron microscope an…
Raman-scattering measurements on single crystals of ${\mathrm{K}}_{2}$${\mathrm{SO}}_{4}$, ${\mathrm{Rb}}_{2}$${\mathrm{SO}}_{4}$, and ${\mathrm{Cs}}_{2}$${\mathrm{SO}}_{4}$ have been made at both room and liquid-nitrogen temperatures. Lattice-dynamical calculations, based on a rigid-ion model using the Gordon-Kim met…
Transition-metal x-ray-emission spectra, corresponding to transitions between the 3s level and the ${\mathit{L}}_{3,2}$ core holes, are studied. The spectra are synthesized from a superposition of two Lorentzian functions, where the relative weighting of the Lorentzians is calculated based on the assumptions of variou…
The crystal structure of Na2SO4(III) (space group Cmcm) and thermal motions of atoms were investigated at 298, 463 and 505 K. The cell parameters are a = 5.6274 (4), b = 8.9664 (11) and c = 6.9737 (9)/~, at 298 K. The R and wR values were 0.0197 and 0.0202 for 984 reflections at 298 K, 0.0201 and 0.0199 for 640 reflec…
Ion implantation is a possible technique to introduce electrochromically active dopants into fine-grained WO3 thin films. However, to be of use, we must be able to distinguish, and erase, effects due to collisional damage. Argon implants were performed in order to investigate damage effects. Pure damage was found to c…
Lamellar microdomains formed in the solvent-cast films of a poly[styrene-block-(ethylene-alt-propylene)] (SEP) diblock polymer were studied by small-angle X-ray scattering (SAXS). The SAXS profiles, displaying a series of peculiar scattering maxima which cannot be ascribed to the higher-order diffraction maxima from a…
High-resolution x-ray scattering experiments to study the critical smectic-A fluctuations in the nematic phase have been performed on a mixture of two nonpolar, two-benzene-ring compounds. The ratio ${\mathit{T}}_{\mathit{N}\mathit{A}}$/${\mathit{T}}_{\mathit{N}\mathit{I}}$ (=0.885) for this mixture is much smaller th…
Abstract Mössbauer spectra were obtained for five Ca-exchanged nontronites and one Ca-exchanged vermiculite as the 2-layer hydrates following dehydration at 200°C. Exchange of the samples with Ca 2+ and subsequent dehydration resulted in the appearance of a shoulder at about −0.50 mm/s in the Mössbauer spectra of some…
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The investigation of the stems of Thinouia coriacea Britton (Sapindaceae), an ichthyotoxic plant from South Brazil, afforded eight glycosides of oleanolic acid. Structures were assigned based on data from partial hydrolysis. 13C-NMR and mass spectral procedures as 3-O-alpha-L-arabinopyranoside (1), 3-O-alpha-L-rhamnop…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFrom 1-D to 3-D ferrimagnets in the EDTA family: magnetic characterization of the tetrahydrate series MtM(M'EDTA)2.cntdot.4H2O [Mt, M, M' = cobalt(II), nickel(II), zinc(II)]F. Sapina, E. Coronado, D. Beltran, and R. BurrielCite this: J. Am. Chem. Soc. 1991, 113, 21, 7940–794…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass temperature of polymer ring systemsArthur Jing Min Yang and Edmund A. Di MarzioCite this: Macromolecules 1991, 24, 22, 6012–6018Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1 October 1991https://pubs.acs.org/do…
The effective elongational viscosity for an oriented fiber assembly of discontinuous fibers suspended in a viscous matrix fluid is developed for a fiber array with variable overalp length of both symmetric and antisymmetric geometries. The results for symmetric and antisymmetric geometries are shown to be equivalent.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical and magnetic properties of cobalt(2+) ions in dried and heated silica gels prepared by the sol-gel processKazuo Kojima, Hajime Taguchi, and Jiro MatsudaCite this: J. Phys. Chem. 1991, 95, 20, 7595–7598Publication Date (Print):October 1, 1991Publication History Publis…
Abstract Thermal analysis and wide‐angle x‐ray diffraction were used to assess the crystallinity for a series of poly(vinyl chloride) (PVC) samples, and the use of two complementary techniques was found beneficial. Two polymers were studied; a commercial suspension grade PVC, and an experimental grade of higher syndio…
The thermopower of the organic superconductor \ensuremath{\kappa}-(BEDT-TTF${)}_{2}$Cu[N(CN${)}_{2}$]Br single crystals has been measured in two crystallographic directions a and c within the most conducting organic donor molecule plane. [Here BEDT-TTF represents bis(ethylenethio)-tetrathiafulvalene.] While the thermo…
In the KTiOPO4 (KTP) structure, it is shown that there are hole sites related by pseudosymmetry to the inequivalent potassium sites K(1) and K(2). The formation of twin domains is through a twofold rotation with the principal feature of the twinning being the displacements of the K atoms onto their respective hole sit…
Abstract The clay mineralogy of the Miocene Monterey Formation was determined for onshore and offshore sequences in the Santa Maria basin area, California. The <0.1- μ m fraction of clayey, opal-CT porcelanites, siliceous mudstones, and dolostones from the Pt. Pedernales area consists of mixed-layered illite/smecti…
Previous studies have shown the effectiveness of partially resorbable arterial prostheses in the rabbit. This study compares these same compound prostheses with commercial graft materials in the dog. Conduits 4 mm inner diameter X 50 mm in length were woven from composite yarns containing 69% polyglactin 910 (PG910)/3…