La 3 (SiO 4 ) 2 Cl: a new structural type of rare-earth chloroorthosilicate
Cristallisation dans C 2 /c avec affinement jusqu'a 0,032. Alternance de plans (La-Cl) n et [La (SiO 4 )] n
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Determination of azimuth angle, incidence angle, and contact-potential difference for low-energy electron-diffraction fine-structure measurements
Low-energy electron-diffraction fine-structure data can often have relatively large inconsistencies associated with the electron-beam incidence conditions. This is in part due to the difficulties associated with working with electrons in the range 0--40 eV and in part due to the crystal being oriented azimuthally befo…
Optimizing the Complex Formulation of Boiling-off Liquor for Ramie Chemical Degumming
The ramie degumming efficiencies of three auxiliaries, sodium pyrophosphate, sodium metasilicate, and sodium sulfite, have been studied using a quadratic orthogonal rotation experimental design. Sodium pyrophosphate performs the function of a major auxiliary, but it can be replaced and replenished by sodium metasilica…
Frequency dependence of coercivity and initial permeability in ferromagnetic metallic glasses
Coercivity Hc( f ) and initial permeability χi( f ) of two kinds of ferromagnetic glasses, 2605S2 and VAC6030, have been measured as a function of frequency from 4 Hz to 2 kHz. Field annealing and stretching of samples have been used to define an easy axis along the longitudinal direction. Some samples were thinned to…
Rigorous theory for chemical shifts in crystal: Application to graphite
A rigorous theory for chemical shifts in crystal is developed. In this formalism, it is clearly seen that the shielding tensor is divided into a demagnetizing term and a microscopic term. The former is caused by the demagnetizing field and is proportional to the bulk susceptibility. The latter is caused by a periodic…
Air temperature and humidity profiles in spray drying. 2. Experimental measurements
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAir temperature and humidity profiles in spray drying. 2. Experimental measurementsSpyridon E. Papadakis and C. Judson KingCite this: Ind. Eng. Chem. Res. 1988, 27, 11, 2116–2123Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published…
Crosslinking of polycaprolactone in the pre‐gelation region
Abstract Polycaprolactone (PCL) crosslinked below the gel point either with peroxide or by exposure to ionizing radiation was compared by Theological studies. As a result of peroxide crosslinking, PCL increases in viscosity and shear rate dependence and exhibits increased dynamic moduli that converge at higher frequen…
Conduction behaviour of the system BixGe20Se80-x
For different compositions of the system Bi x Ge 20 Se 80- x with 5 ⩽ x ⩽ 40 at.% metallic and both gapless and normal semiconductor-conduction behaviours could be shown depending on x and conditions of treatment. The calculated activation energy seemed relatively small and decreased with more enriching with Bi. The o…
High‐molecular‐weight poly(p‐phenyleneterephthalamide) by CaCl2 promoted direct polycondensation with thionyl chloride in N‐methylpyrrolidone
Abstract The direct polycondensation of terephthalic acid and p ‐phenylenediamine hydrochloride (PPD.2HCl) with thionyl chloride was found to be significantly promoted in N ‐methylpyrrolidone (NMP) by dissolved CaCl 2 and tertiary amines. The inherent viscosity of the polymer obtained varied with the amount of CaCl 2…
Melt Rheology of Two Engineering Thermoplastics: Poly(ether Imide) and Poly(2,6‐Dimethyl‐1,4‐phenylene Ether)
Material functions of two engineering plastics [a poly(phenylene ether) and a polycether imide)] were characterized, including the shear viscosity, first normal stress coeffkient, storage and loss moduli, growth and relaxation of shear stress, and first normal stress coeffkient and relaxation moduli. The oscillatory s…
X‐ray investigation on highly oriented polyacetylene, 3 Crystal structure of the iodine/trans‐polyacetylene complex
Abstract The crystal structure of iodine/trans‐polyacetylene complexes (CHI y ) x ( y = 0,009, 0,035, 0,17 and 0,30) was investigated by X‐ray diffraction analysis of highly oriented samples. An iodine‐containing phase (PAI) was observed in all cases, accompanied by residual crystallinity due to pristine polyacetylene…
Density of Liquid Rare‐Earth Sesquioxides
The densities of seven rare‐earth sesquioxides and yttrium sesquioxide were measured in the liquid state in the temperature range from melting point to ∼3200 K. An aerodynamic levitation technique and laser‐heating method were used. The variation of volume at fusion for these oxides was deduced from these results and…
Mesophase Transition of Series Materials Containing Fluorene, Fluorenone and Biphenyl Structures with Chiral End Groups
S 2-alkoxyfluorene-7-carboxylic acid 4-(2-methylbutoxy)-phenyl ester and S 2-alkoxyfluorenone-7-carboxylic acid 4-(2-methylbutoxy)-phenyl ester were synthesized and the effects of mesogen modification or substitution of biphenyl with fluorene and fluorenone group in a mesogen core were studied to obtain a wide tempera…
MICROSTRUCTURE OF GRANULAR BAINITE
A 2.25Cr - 1Mo - 0.1C welded steel having a microstructure described as "granular bainite" has been investigated using optical microscopy, electron microscopy and atom probe field ion microscopy. Granular bainite was found to consist of bainitic ferrite and retained austenite, but no cementite. Grains of ferrite are b…
Synthesis, Characterization and X-Ray Diffraction Studies of a New Homologous Series of Cyano-Substituted Mesomorphic Side Chain Polyacrylates
A new series of cyano-substituted mesomorphic side chain polyacrylates has been synthesized. Optical observations, D.S.C. studies and X-ray diffraction on oriented samples show that all polymers possess a partially bilayer Sa d phase. The smectic period has been measured from which it is inferred that the molecular st…
Modified ferroelectric high density Strontium Barium Niobate ceramics for pyroelectric applications
Modified Strontium Barium Niobate (SBLLN) ceramics were prepared by the conventional oxide technique. The permittivities of thermally depoled SBLLN ceramics measured at 100 kHz are much smaller than that of intrinsic Sr0.75Ba0.25Nb2O6 crystal. The EP hysteresis loops of the materials are of the slim-loop type. Ceramic…
A kinetic study of the decomposition of HNO3 and its reaction with NO
Abstract The rate of reaction between NO and HNO 3 and the rate of thermal decomposition of HNO 3 have been measured by FTIR spectroscopy. The measurements were made in a teflon lined batch reactor having a surface to volume ratio of 14 m −1 . During the experiments, with initial HNO 3 concentrations between 2 and 12…
Facile Syntheses of Perfluoroalkylporphyrins. Electron Deficient Porphyrins II
Abstract A variety of β-perfluoroalkylpyrroles were prepared from reaction of β-perfluoroalkyl-α,β-unsaturated ketones with p-toluenesulfonylmethylisocyanide in moderate yields. Tetrakis(perfluoroalkyl)porphyrins were readily obtained by oxidative cyclization of 2-hydroxymethyl-3-ethyl-4-perfluoroalkylpyrroles in acid…
Soft Mode Contribution around Sm A-Sm C* Phase Transition Temperature under DC Bias Field in Ferroelectric Liquid Crystal
The relaxation of the soft mode is observed both in the Sm A and Sm C * phases by eliminating the contribution of the Goldstone mode under a dc bias field. Three relaxations are observed in the Sm C * phase at the frequency range below 10 MHz. The temperature dependence of the dielectric constant originating in the so…
Fluorescent lanthanide complexes. 1. Reaction between terbium(3+) and 4-oxo-4H-1-benzopyran-3-carboxaldehyde in alcoholic medium
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescent lanthanide complexes. 1. Reaction between terbium(3+) and 4-oxo-4H-1-benzopyran-3-carboxaldehyde in alcoholic mediumCarla Bisi Castellani, Oliviero Carugo, Carlo Tomba, and Anna Invernizzi GambaCite this: Inorg. Chem. 1988, 27, 22, 3965–3968Publication Date (Prin…