Materials Literature
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As shown in an earlier publication (Håkansson 1990) C. kuetzingiana Thwaites and C. meneghiniana Kütz. are conspecific and for this the name C. meneghiniana has to be used. A new name, C. krammeri, is now proposed for the taxon that has long been called C. kuetzingiana and the similarity of this species to C. ocellata…
Abstract A series of carbon blacks of widely varying morphology and microstructure were analyzed for surface compositional properties employing SIMS, XPS/ESCA, and GC-MS. These studies were supported by bulk analyses for hydrogen and oxygen content. Surface reactivity was assessed by means of inverse gas chromatograph…
The switching of polarization in ferroelectrics is considered as the first-order phase transition. By the analogy with the theory of crystal growth it is assumed that the switching process is determined by the oversaturation degree which correspond in ferroelectrics to the magnitude of electric field on the domain bou…
Ilex crenata Thunb. `Rotundifolia' split-root plants were grown for 3 weeks with root zones at 30/30, 30/34, 30/38, 30/42, 34/34, 38/38, and 42/42C. The 38C root-zone treatment was the upper threshold for several growth and physiological characteristics. A portion of the root system grown at or near the optimum temper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTotal synthesis of (+)-verrucosidinKonghyun Whang, R. J. Cooke, Gurol Okay, and Jin K. ChaCite this: J. Am. Chem. Soc. 1990, 112, 24, 8985–8987Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://pubs…
Results referring to liquid crystalline isothiocyanates especially as components of liquid crystal mixture were summarized. The outstanding feature of liquid crystalline isothiocyanates is the possibility to make mixtures with a wide range of nematic phase low viscosity and weak temperature dependence of viscosity. Th…
The well-known two-dimensional octagonal quasilattice is realized by means of dualization and Klotz construction. We discuss the geometric properties and the extended symmetry of the pattern. The concept of geometric defects is introduced, and an elastic energy measure \ensuremath{\Delta}E is presented that allows a s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox catalysis involving substrate photooxidation with catalyst regeneration by substrate reduction. Simultaneous oxidative C-H bond cleavage and reductive C-S bond cleavage in thioethers catalyzed by polyoxotungstate, W10O324-R. Carlisle Chambers and Craig L. HillCite this…
Abstract New side‐on liquid‐crystalline side‐chain polymers (LCSCP's) are presented as having a systematic variation of the anisotropy of polarizability with respect to the mesogenic short axis. Starting from hydroquinone as core of the rod, the polarizability perpendicular to the mesogenic long axis is increased step…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroporous poly(methyl methacrylate) membranes: effect of a low-viscosity solvent on the formation mechanismFu Jya Tsai and John M. TorkelsonCite this: Macromolecules 1990, 23, 23, 4983–4989Publication Date (Print):November 1, 1990Publication History Published online1 May 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuadratic hyperpolarizabilities of Group 6A metal carbonyl complexesL. T. Cheng, W. Tam, and D. F. EatonCite this: Organometallics 1990, 9, 11, 2856–2857Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990ht…
Preparation schemes for high‐purity vitreous B 2 S 3 ( v ‐B 2 S 3 ) with a S:B ratio of 1.478 ± 0.032 are described. Preparation schemes reported in the literature are shown by very sensitive FT‐IR measurements to yield v ‐B 2 S 3 with significant oxygen contamination. Through extreme care taken in carbonizing silica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance studies of "FeO6" tris chelate complexes: models for the effects of zero-field splitting in distorted S = 5/2 spin systemsDavid Collison and Anne K. PowellCite this: Inorg. Chem. 1990, 29, 23, 4735–4746Publication Date (Print):November 1, 1990Publicat…
Abstract The nucleation of barite has been studied in a system involving the doublediffusion of Ba 2+ and SO 4 2- in an Na-rich aqueoussolution, through a porous medium. The evolution of the concentration profiles in the medium, which is a column of porous silica gel, has been determined as a function of time by direc…
To investigate the kinetics of porous flow in partially molten peridotite, a melt migration couple – formed from a disc of fine‐grained olivine plus ∼15% of a synthetic K‐Al silicate glass and a disc of poly crystalline olivine – was heated at 1255°C under a confining pressure of 300 MPa for 2 hr. Driven by capillary…
The morphology of some very small Stephanodiscus and Cyclostephanos species from Canada, USA and Europe has been studied by light and electron microscopy. The possible influence of the environment on the variation of those characters often used in the diagnosis of species is discussed and an attempt is made to improve…
Abstract Research on high‐temperature organic polymers was initiated in the late 1950s primarily to meet the needs of the aerospace and electronics industry. Since then, many different heat‐resistant polymer systems have been reported, of which several are now commercially available. These polymers are used in many di…
The heat capacities of liquid and crystalline Au-Pb-Sb alloys in the glass-forming composition range were measured with droplet emulsion and bulk samples. Based on the measured Cp data, the entropy, enthalpy, and Gibbs free-energy differences between the eutectic solid mixture and undercooled liquid were determined as…
As part of a phase II clinical trial, 14 patients with presumed intracranial neoplastic disease underwent magnetic resonance (MR) imaging before and after intravenous injection of gadolinium 1,4,7-tris(carboxymethyl)-10-(2'-hydroxypropyl)-1,4,7,10-tetraazacycl ododecane (HP-DO3A). This neutral (nonionic) gadolinium ch…
Poly(N-acetylethylenimine) (polyoxazoline) (POZO) with a terminal triethoxysilyl group was successfully synthesized by the ring-opening polymerization of 2-methyl-2-oxazoline followed by termination with 3-aminopropyltriethoxysilane. Triethoxysilyl-terminated telechelic POZO was prepared by using a bifunctional initia…