Materials Literature
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Abstract The influence of diluent composition on the internal structure of porous copolymers of 1,4‐di(methacryloyloxymethyl)naphthalene (1,4‐DMN) and divinylbenzene (DVB) was studied. A set of copolymers containing 0.5 mole fraction of 1,4‐DMN and 0.5 mole fraction of DVB obtained in the presence of various amounts o…
The need for more efficient transformer core materials, due to increased recognition by electric utilities of the costs of system losses, has spurred the development of amorphous alloy usage in power transmission and distribution transformers. Amorphous alloy core fabrication, as it relates to single phase distributio…
Summary. The relationship between environmental archaeology and diatom analysis, a well established technique in palaeoecology, is explored. The development of diatom analysis for palaeoenvironmental reconstruction is briefly considered and flow diagrams are presented to illustrate laboratory techniques. Examples of r…
Surface Raman scattering (SRS) by electron-hole pairs at metal surfaces has been analysed theoretically and experimentally. Our analysis, performed for a planar surface, predicts for the SRS intensity a broad peak at low temperatures, due to the excitation of e-h pairs by the polariton field penetrating into the metal…
Abstract This study is concerned with some kinetic features of the reaction of n‐butyl isocyanate with poly(vinyl alcohol) without any catalyst and using triethylene diamine as catalyst. The structure of the resulting polymers was determined by means of IR, 1 H‐ and 13 C‐NMR spectroscopy as well as by chemical analysi…
-Measurements has been made of the ignition temperature of three structural metals in bulk form in a pure oxygen environment. Cylindrical specimens 5 mm in diameter and 5 mm high were ignited by a focused cwCOz laser beam in a static oxygen environment at pressures from 0.084 to 6.895 MPa. A two-color pyrometer was de…
Historically, simulations of the blown film process have been carried out only to the freeze line; a point which is often well below the actual frost line for the process. This limitation in previous simulations was discovered to be related to the interaction of the process boundary conditions with the rheological equ…
This paper reports the results of experimental investigations into the chemical shifts of Fe 2p, Ni 2p and N 1s in Ni-Fe alloy and Fe films. Through XPS analysis on Ni-Fe film composition, it is known that the binding energy of Fe 0 2p increases and the satellite around 859 eV shifts toward lower binding energy with a…
The solid solution (${\mathrm{Cd}}_{0.83}$${\mathrm{Pb}}_{0.17}$${)}_{2}$${\mathrm{Nb}}_{2}$${\mathrm{O}}_{7}$ has a ferroelectric transition at 71 K. Dielectric, specific heat, and electrocaloric measurements are reported in the paraelectric phase of this material on multilayer ceramic capacitors which support electr…
Zwischen den Extrema (Cs⊕)4(Hg4)4⊖ und (Cs⊕)4(Hg4)°4e⊖ liegt der Bindungszustand in CsHg, das isolierte, quadratisch-planare Hg4-Cluster enthält. Die Temperaturabhängigkeit des spezifischen elektrischen Widerstands dieser goldbronzenen, extrem luftempfindlichen Verbindung weist sie als Metall aus, so daß die Formulier…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInverse photoemission spectroscopy at the platinum/acetonitrile interface with several redox couplesJiangbo. Ouyang and Allen J. BardCite this: J. Phys. Chem. 1987, 91, 15, 4058–4062Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published…
The kinetics and mechanisms of the decomposition of C2H2, C2H4, and n-C4H10 on polycrystalline Ni resulting in the carburization of the metal have been studied at 1300 to 1500 K and 10−4–10−1 Pa. Special attention has been given to the reaction-retarding effect of surface-segregated carbon. Simultaneous investigations…
Abstract Non isothermal crystallization of Polyamide 66 is studied by differential scanning calorimetry (DSC). OZAWA's theory has been successfully applied to the crystallization of the polymer with or without nucleating agents. Whith glass fibers, a non‐appreciable alteration of the crystalline structure has been not…
Equations of motion for nematic liquid crystals under time-dependent shear are derived. Soliton solutions are investigated. When the soliton velocity is large and the shear varies slowly in time, approximate analytic solutions for single solitons of the A and B types are found with use of multiple-scale analysis. Thes…
The crystalloid endoplasmic reticulum (ER) of UT-1 cells is a specialized smooth ER that houses 3-hydroxy-3-methylglutaryl-CoA reductase, a membrane protein that regulates endogenous cholesterol synthesis. The biogenesis of this ER is coupled to the over production of 3-hydroxy-3-methylglutaryl-CoA reductase. To under…
The composition and thickness of the oxide/hydroxide film that forms on pure Al polarized in 0.05M Na2SO4 solutions with and without the addition of 1000 ppm Cl− under acidic, near-neutral, and alkaline conditions have been determined using x-ray photoelectron spectroscopy. Changes in the films due to the ex situ natu…
An improved method has been developed for determining the microenvironment volume of protective clothing assemblies. Subjects wearing four different helicopter pilot suits were enclosed in an impermeable polyvinyl outer suit. Air from within the enclosed environment was evacuated at a constant rate with a vacuum sourc…
Abstract Despite advances in instrumentation for direct determination of SO 2‐ 4 , many investigators analyzing saline soils continue to estimate SO 2‐ 4 by difference between the sums of major cations and anions and to measure gypsum by methods that avoid direct SO 2‐ 4 determination. The present study compares SO 2‐…
Abstract The deformation of biaxially oriented polypropylene sheet produced by the BeXor process has been examined in terms of the hierarchical solid state structure described previously. The mechanical properties have been examined over a range of temperatures and strain rates. The anisotropic nature of uniaxial tens…
Abstract We studied clay mineralogical and chemical properties of Murtip and Quillayute soils from Oregon that are classified as Typic Dystrandepts. The soils are nonallophanic and have clay fractions dominated by chloritized 2:1 minerals. Both showed chemical properties similar to those of most nonallophanic Andisols…