Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in binuclear transition-metal complexes bridged by imidazolate, benzimidazolate, biimidazolate, and bibenzimidazolate ionsMuin S. Haddad and David N. HendricksonCite this: Inorg. Chem. 1978, 17, 9, 2622–2630Publication Date (Print):September 1,…
Abstract Spatial patterns of dry matter, nitrogen, and organic carbon were investigated for velvet mesquite [ Prosopis juliflora (Swartz)] DC and for palo verde [ Cercidium floridum Benth.] ecosystems in the Upper Sonoran Desert of Arizona. Standing understory vegetation and litter originating from the overstory shrub…
An experimental study was carried out to investigate the influence of molecular weight distribution on stretchability and thread nonuniformity of high-density polyethylene monofilaments. For the study, a melt-spinning/multistage stretching device was constructed, and the monofilaments were extruded first into a quench…
The measurement of the response of Mg2SiO4 : Tb thermoluminescent dosimeter against radiation dose has been made and the result is presented. The supralinearity observed is characterized by (1) a clear power-law relation between the response and the dose and (2) a sharp transition from the linear to the supralinear re…
Hard magnetic properties of Alnico 5 are very sensitive to the applied cooling rate under a magnetic field. A new experimental device has been designed, which allows to cool samples at a constant speed in the gap of an electromagnet. Cooling rates can be varied from 5°C/min. to 170°C/min, and the magnetic field can be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of Silane Coupling Reactions. 1. Reaction of Trimethylmethoxysilane and Triethylsilanol Studied by Gas-Liquid ChromatographyP. DreyfussCite this: Macromolecules 1978, 11, 5, 1031–1036Publication Date (Print):September 1, 1978Publication History Published online1 Ma…
Based on observations about statistical characteristics and microstructural dependence of Barkhausen noise, a possible model for the mutual coupling of domain transitions within polycrystalline microstructure is proposed. Experimentally evaluated Barkhausen noise behaviour as a function of grain size in annealed and t…
Abstract Nine muscovite samples from different localities were analysed for all major chemical elements and examined by infrared spectroscopy in the range of 4000–250 cm −1 . Iron in the octahedral positions was found to cause an intensity decrease and shifting of some absorption bands. Other structural cations were f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the Deformation Mechanism of Polyethylene Spherulites by the Orientation Distribution Function of CrystallitesMasaru Matsuo, Kazumi Hirota, Kenichi Fujita, and Hiromichi KawaiCite this: Macromolecules 1978, 11, 5, 1000–1007Publication Date (Print):September 1, 197…
The magnetic properties of the alloy Mn55Al45in its metastable ferromagnetic state have been investigated as a function of particle size in the range 1000μm down to about 20μm. It has been shown that the coercivity rises very rapidly as the particle size decreases but the remanence was shown to increase slowly and the…
Abstract The tensile properties of high and low density polyethylene specimens produced under careful crystallization and annealing procedures have been determined. A morphologically controlled brittle‐ductile transition has been observed for high density polyethylene. Although the lamellar thickness appears to determ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and structure of tri-.mu.-halogeno-hexacarbonyldirhenate(I) salts of monocationic porphyrin acidsC. P. Hrung, M. Tsutsui, D. L. Cullen, E. F. Meyer Jr., and C. N. MorimotoCite this: J. Am. Chem. Soc. 1978, 100, 19, 6068–6076Publication Date (Prin…
An elastic analysis of dislocations in isotropic media has been applied to study the interaction of dislocations on intersecting {111} planes at a coherent twin boundary in the face-centered-cubic lattice. The nature of energetically favorable barriers formed by such reactions is determined and their equilibrium separ…
Six vinyl phosphonates have been synthesized and evaluated as grafts on poly(ethylene terephthalate) for their flame retardance properties. Diethylvinyl phosphonate was used as a model for phosphorus-containing flame retardants in developing the methodology for localizing flame retardants either on the surface of the…
Fourier transform infrared spectra (3800 to 450 cm −1 ) and laser Raman spectra (4000 to 0 cm −1 ) of crystalline phenylsilanetriol and phenylsilanetriol-d 3 , and liquid state phenylsilanetriol and phenylsilanetriol-d 3 are first reported. Complete band assignments are attempted. All vibrational modes of the SiOH gro…
The mixed‐alkali effect on chemical durability was evaluated for bulk and powdered Na 2 O‐K 2 O‐CaO‐SiO 2 glasses. Two contributions to this effect are discussed, i.e. those of glass structure and corrosion solution. The magnitude of the mixed‐alkali effect depends on the pH of the corroding solution. For pH<9, alk…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic Properties of Linear Polymers with High Molecular Weights and Sharp Molecular Weight DistributionsYoshinobu Isono, Teruo Fujimoto, Naoki Takeno, Hirokazu Kajiura, and Mitsuru NagasawaCite this: Macromolecules 1978, 11, 5, 888–893Publication Date (Print):Septembe…
Abstract Three samples have been selected to represent the sedimentary variations of the Basin of Autun. IR and ESR techniques have been used to study the sheet composition of the different kinds of clays. The kaolinites are fire clays with two different degrees of crystallinity. The illites have a muscovite origin an…
The application of magnetic amorphous alloys in power transformers could produce significant savings of energy. Currently, the major disadvantage of amorphous alloys is their relatively low room-temperature saturation induction. We have attained a saturation reduction of 17.3 kG in heat-treated amorphous Fe86B8C6. By…
The response of a lead zirconate titanate ceramic to statically applied uniaxial stresses in the range 0–0.4 GPa has been investigated. The material studied was a niobium-doped composition with the chemical formula Pb0.99Nb0.02(Zr0.95Ti0.05)0.98O3. Properties measured as a function of stress include electrical charge…