Pearls & pitfalls in electrocardiography: Pithy, practical pointers
Pearls and Pitfalls in Electrocardiography: Pithy Practical Pointers , Pearls and Pitfalls in Electrocardiography: Pithy Practical Pointers , کتابخانه الکترونیک و دیجیتال - آذرسا
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A kinetic study of pyrolysis in pitch impregnated electrodes
Abstract Carbon electrodes impregnated with three different pitches have been studied and compared. The electrode samples were heated up to 893 K in a thermogravimetric analyser at different heating rates. The weight loss was recorded with respect to time and temperature. A special technique and a calculation procedur…
Synthesis, electronic structure, and reactivity of metallacyclotetraazapentadienes.
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis, electronic structure, and reactivity of metallacyclotetraazapentadienes.William C. TroglerCite this: Acc. Chem. Res. 1990, 23, 12, 426–431Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inissue 1 December 1990https://pu…
Surface Plasmon-polaritons on an Anisotropic Substrate
The case of a surface plasmon-polariton (excited by transverse magnetic light) propagating at the interface between an isotropic metal (silver) and an anisotropic (uniaxial) substrate is considered. The field distribution within the system is illustrated when the optic axis of the substrate is not orthogonal in the pl…
AIR IMPURITIES IN THE PVC PLASTICS PROCESSING INDUSTRY
Polyvinylchloride (PVC) is a common thermoplastic and one which often contains plasticizers. The most important plasticizer is di-2-ethylhexylphthalate (DEHP). Hygienic conditions in the PVC processing industry were surveyed by measuring the air concentrations of hydrogen chloride, DEHP and phthalic anhydride (PA) in…
SEM Studies of the Surface and Fracture Morphology of Pineapple Leaf Fibers
The structural features and fracture morphology of raw and chemically treated pineapple leaf fiber have been studied using scanning electron microscopy. Pineapple leaf has a multicellular structure, and alkali treatment clearly reveals the ultimate fibers. Surface morphology progressively changes with gradual removal…
Entanglement and the molecular weight dependence of polymer glass transition temperature
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEntanglement and the molecular weight dependence of polymer glass transition temperatureY. H. LinCite this: Macromolecules 1990, 23, 25, 5292–5294Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inissue 1 December 1990https://p…
Revised unit-cell dimensions, space group, and chemical formula of some metallic minerals
New data are given for algodonite (formula), awaruite (formula, space group), billingsleyite (space group, unit cell), bogdanovite (formula, space group), hexatestibiopanickelite (formula), keithconnire (formula), mgriite (formula), polarite (formula), roaldite (space group), sobolevskite (space groups, unit cells), s…
Split-Hopkinson Pressure Bar Testing of Unsaturated Sand
Abstract High amplitude, split-Hopkinson pressure bar (SHPB) laboratory tests were conducted on compacted specimens of 50/80 silica sand to evaluate the influence of saturation on compressional-stress wave velocity, stress transmission, and attenuation. Stress wave velocity and transmitted stress increase as the satur…
Relevance of Different Intercalation Tests for Distinguishing Halloysite from Kaolinite in Soils
Abstract The expandabilities of kaolin-group minerals in different horizons in 10 soils from New Zealand and Fiji were measured immediately after the application of formamide and after the sequential application of hydrazine, water, and glycerol (HWG treatment). The expandabilities of these minerals in some of the soi…
Clay mineral formation at the continent-ocean boundary: the verdine facies
Abstract The verdine facies, previously confused with components of ancient ironstones, has been studied in relation to its distribution, mineralogy, genesis, environment, and geological significance. Several chemically specific components are present including (i) a ferric and magnesian dioctahedral-trioctahedral 1 :…
A Chemical Method for the Deposition of Nickel Oxide Thin Films
Abstract not Available.
Role of Interfacial Friction and Lubrication in Yarn and Fabric Mechanics
We describe an experimental study of the effects of various surface treatments on the frictional and tensile properties of cotton and aramid single yams and also on the mechanical properties of fabrics woven from these yams. Lubrication of the yarn or fabric generally reduces those parameters that quantitatively descr…
Direct and Indirect Dissolution of Sapphire in Calcia–Magnesia–Alumina–Silica Melts: Dissolution Kinetics
The dissolution rate of sapphire into CaO‐MgO‐Al 2 O 3 ‐SiO 2 (CMAS) melts was investigated at 1450° and 1550°C. The effects of immersion time, specimen rotation rate, and magnesia concentration in the bulk melt on the sapphire dissolution rate and on the growth rate of magnesium aluminate spinel at the sapphire/melt…
Melt Strength Behavior of PE and its Relation to Bubble Stability in Film Blowing**
Abstract Melt strength data are presented on the three major classes of commercial polyethylenes (LDPE, LLDPE and HDPE). The LDPE samples studied were polymerised by both tubular and autoclave reactor technology and the LLDPE samples were produced with different α-olefins as comonomer. Melt strength was assessed from…
Nature and origin of an aluminous vermiculitic weathering product in acid soils from upland catchments in Scotland
Abstract Vermiculitization of mica is one of the main weathering processes in soils from three upland catchments receiving various levels of acid deposition. Usually this process is manifested by the presence of interstratified mica-vermiculite with the interlayer space in the vermiculite often partially filled with p…
The effect of ionizing radiation on sol-gel ferroelectric PZT capacitors
Ferroelectric (FE) thin-film capacitors are irradiated to 100 Mrad(Si) with 10-keV X-rays. Some of the FE hysteresis loops show distortion at 5 Mrad(Si). The type and degree of distortion are dependent on the polarization state and/or the applied field during irradiation. Preliminary results indicate that a fraction o…
Raman Microprobe Spectroscopy of Uranium Dioxide Single Crystals and Ion Implanted Polycrystals
Polarized Raman spectra of uranium dioxide single crystals were recorded with the use of a Raman microprobe. Results showed a peak at 448 cm −1 , having only off-diagonal tensor elements, which was assigned to the T 2 g zone center phonon. There was also a broad peak at 1156 cm −1 , which was ascribed to electronic Ra…
Oriented polymer networks obtained by photopolymerization of liquid‐crystalline monomers
Abstract In this paper a new class of oriented polymers is introduced: highly crosslinked polymer networks obtained by photopolymerization of oriented liquid crystalline (LC) monomers. Orientation of these monomers can be induced in the same manner as usual for conventional LCs applied in LCDs: with the aid of an elec…
The "anomalous" basicity of P(NHCH2CH2)3N relative to P(NMeCH2CH2)3N and p(NBzCH2CH2)3N: a chemical consequence of orbital charge balance?
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe "anomalous" basicity of P(NHCH2CH2)3N relative to P(NMeCH2CH2)3N and p(NBzCH2CH2)3N: a chemical consequence of orbital charge balance?M. A. H. Laramay and John G. VerkadeCite this: J. Am. Chem. Soc. 1990, 112, 25, 9421–9422Publication Date (Print):December 1, 1990Publica…