Materials Literature
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Abstract Aus einer B 2 O 3 ‐Schmelze gelang die Synthese von Einkristallen der Substanzen Cu 2 M(BO 3 )O 2 (M = Fe 3+ (I), Ga 3+ (II)), die isotyp zueinander sind und in einer monoklin verzerrten Strukturvariante eines Ludwigites mit teilweise geordneter Metallverteilung kristallisieren. Röntgenographische Untersuchun…
Rietveld analysis has enabled a determination, by an internal approach, of the degree of crystallinity of a sample of polyethylene terephthalate (PET) and three samples of zirconium oxide obtained by precipitation from ZrOCl2 followed by crystallization at a different temperature. After subtraction of the air scatteri…
Two new (3, 4) and two known (1, 2) genuine acylated bisdesmosidic triterpenoid glycosides of polygalacic acid (2 beta, 3 beta, 16 alpha, 23-tetrahydroxyolean-12-en-28-oic acid) were isolated from the aerial parts, as well as from the roots, of Solidago virgaurea L. subsp. virgaurea. The structures of these esters wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Ceramic Filters for Flue Gas Cleaning. 2. Catalytic Performance and Modeling ThereofGuido Saracco and Vito SpecchiaCite this: Ind. Eng. Chem. Res. 1995, 34, 4, 1480–1487Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published in…
Abstract X‐ray photoelectron spectroscopy (XPS, ESCA) was used to determine the tungsten oxidation states in a 5 wt.% WO 3 /TiO 2 catalyst reduced in hydrogen in the temperature range 400–700°C. Because, in the region of interest, W 4f overlaps with the Ti 3p energy level, a multiple analysis procedure including decon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Orbital Calculations of Octahedral Molybdenum Cluster Complexes with the DV-X.alpha. MethodHideo Imoto, Taro Saito, and Hirohiko AdachiCite this: Inorg. Chem. 1995, 34, 9, 2415–2422Publication Date (Print):April 1, 1995Publication History Published online1 May 2002…
Poly(β-hydroxybutyrate)s (PHB) of different microstructures were synthesized via anionic polymerization of β-butyrolactone initiated by two initiators: 1) supramolecular complexes of alkali metals with asymmetric induction agents, and 2) alkali metal alkoxides. The relationships between chemical microstructure and hyd…
Abstract Single crystals having optical quality and dimensions up to 50 mm of sulfamic acid (H[NH 2 SO 3 ]), of the monosulfamates of Li, Na, K, Rb, Cs, Tl, NH 4 , C(NH 2 ) 3 , (CH 3 ) 3 NCH 2 COOH, of CsH[NH 2 SO 3 ] 2 and NH 4 [NH 2 SO 3 ] * NH 4 [HSO 4 ] have been grown from aqueous solutions by standard methods (c…
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas Phase Synthesis, Structure, and Dissociation of Boron TriazideR. L. Mulinax, G. S. Okin, and R. D. CoombeCite this: J. Phys. Chem. 1995, 99, 17, 6294–6300Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published inissue 1 April 1995htt…
The purpose of this paper is to provide an overview of the engineering methods, tools, design solutions and verification methods used in the design of HVDC converter substations subject to acoustic requirements. The sound generation section of the paper describes how the sound power level radiated from electrical comp…
The thermal dependences of the principal refractive indices of lithium triborate (LBO) have been measured over an extended temperature range of 20–200 °C with a Michelson interferometer. The data obtained are critically evaluated by prediction of the temperature dependences of phase matching and the temperature bandwi…
Radiation quantities and units assessment of doses from natural and man-made sources instrumentation in dosimetry and radiation protection methods of evaluation and measurement of basic dosimetry and radiation protection quantities.
We investigate the porosity dependence of the ferroelectric domain density and the internal stress of fine-grained (∼1 µ m) BaTiO 3 ceramics using transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The ferroelectric domain density and the internal stress exerted by the neighboring grains of the fin…
Abstract Low viscosity polyalphaolefin fluids (2 and 4 cSt ® 100°C) are significantly biodegraded under the conditions of the CEC‐L‐33‐T‐82 test procedure. This is contrary to the widespread, but inaccurate, perception that polyalphaolefin (PAO)fluids are generally not biodegradable. In a time‐extended CEC‐L‐33‐T‐82 t…
Blends of cellulose acetate (2.5 degree of substitution) and starch were melt processed and evaluated for mechanical properties, biodegradability during composting, and marine and soil toxicity. Formulations containing, on a weight basis, 57% cellulose acetate (CA), 25% corn starch (St) and 19% propylene glycol (PG) h…
Abstract A variety of esters from the reactions of monoalcohols with palm olein were prepared, epoxidized by in situ peroxyacid techniques, and some of their physical properties were compared. The thermal oxidative stabilities of these esters and bis (2‐ethylhexyl) phthalate were studied. The esters were placed in an…
A method for studying adsorption and desorption processes of impurity ions in nematic liquid crystal cells is proposed. The experimental results for 4-cyano-4‘-pentyl biphenyl are interpreted in terms of a rate-equation approach and the time constants for the adsorption and desorption processes of the ions are determi…
Orthorhombic (O1, O2 and O3) and monoclinic (M1 and M2) phases are the crystalline approximants of the Al–Cu–Fe–Cr decagonal quasicrystal. The structures of these crystalline phases can be described using three subunits, which are derived from the O3 structure. As an example, the structural model of the O1 phase is pr…
The enzymatic degradation of films of synthetic poly[(R,S)-β-hydroxybutyrate], PHB, of various tacticities was investigated by weight loss measurement. Extracellular PHB depolymerases of the bacterium Pseudomonas lemoignei and the fungus Aspergillus fumigatus M2A were used. In both enzyme systems the nearly atactic sa…