Materials Literature
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In this paper we study theoretically and experimentally the transport of electrons in Teflon FEP type A under isothermal conditions (145 °C) in open circuit. We suggest a theoretical model including surface, shallow, and deep traps. The model leads to a system of partial differential equations which was solved numeric…
Abstract The modules and birefringence of oriented polymers are known to couple through the structural and intrinsic properties of the polymer. Recent developments in both optical and mechanical theories have allowed this coupling to be expanded so that it includes predictions of modulus and refractive indices of unia…
The misorientation dependence of grain boundary sliding and effects of grain boundary structure and crystal deformation on sliding have been studied by experiments using 〈1010〉 tilt zinc bicrystals with different misorientations. The results have shown that grain boundary sliding strongly depends on the misorientation…
High-resolution electron-microscope images in conjunction with selected-area electron diffraction were used to investigate the short-range order in PbMg1/3Nb2/3O3. Intensity fluctuations of the [110] image indicated ordered domains extending over about 20 to 50 Å. Decomposition phases were observed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical properties and electronic interactions of microcrystalline copper/zinc oxide (Cu/ZnO) catalystsJohn B. Bulko, Richard G. Herman, Kamil. Klier, and Gary W. SimmonsCite this: J. Phys. Chem. 1979, 83, 24, 3118–3122Publication Date (Print):November 1, 1979Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-supported metal cluster carbonyls. Chemisorption decomposition and reactivity of hexadecacarbonylhexarhodium supported on alumina, silica-alumina, and magnesiaA. K. Smith, F. Hugues, A. Theolier, J. M. Basset, R. Ugo, G. M. Zanderighi, J. L. Bilhou, and W. F. Graydon…
The optical-absorption spectrum of ${\mathrm{Tm}}^{3+}$ in TmCr${\mathrm{O}}_{3}$ single crystals in the spectral range 6000-8100 \AA{} is reported as a function of photon polarization and temperature from 3.4 to 77.3 K. Singlet states of the ${\mathrm{Tm}}^{3+}$ ground multiplet $^{3}H_{6}$ are found at 17.7, 41.3, 7…
Magnetically uniaxial amorphous Co79Fe6.5B14.5 films 1.5 μm in thickness were deposited by r.f. bias sputtering from a Co74Fe6B20 target onto glass and single crystal Si substrates. The saturation magnetostriction, λs, changed gradually from +0.6×10−6 to −0.4×10−6 when the d.c. bias voltage was increased from 0 to −12…
Any cubic crystal structure can be divided into small units in the form of congruent semi-regular (Archimedean) truncated octahedra. The centers of these polyhedra can be chosen at invariant equivalent positions for most cubic space groups. The part of a crystal structure enclosed by an Archimedean polyhedron is calle…
Ferrite devices for millimeter frequencies, 35 GHz to 94 GHz, are difficult to fabricate and have marginal performance. This paper discusses the design and arc plasma fabrication process for non-reciprocal ferrite phase shifters for millimeter frequencies. Design and fabrication techniques were developed for 35 GHz, p…
Abstract The compatibility and mechanical properties of poly(vinyl chloride) (PVC) and thermoplastic polyurethane (PU) are described in this paper. The compatibility has been estimated using a variety of methods including the measurements of viscosity of polymer solutions, comparison of solubility parameters of PVC an…
This paper reports on the application of the concept of effective permeability using the finite element technique, to the solution of eddy current problems, and the determination of damping resistances as well as the characteristics of the solid iron rotors in rotating machinery during transients. The formulation is b…
Mn1-x-yAlxCyforms for0.42 \leq x \leq 0.47and0 \leq Y \leq 0.021a metastable tetragonal τ-phase which is ferromagnetic. Its unaxial magnetic anisotropy makes it an interesting candidate for permanent magnetic applications. The metastable τ-phase is produced from the high temperature equilibrium ε-phase in two steps; a…
The determination of the glass-transition pressure by the ruby R1 line-broadening method is quantitatively confirmed to within 10% by an independent method. The procedure utilizes a model which describes the pressure dependence of the viscosity and contains the glass-transition pressure as a parameter. The two methods…
The Air Force Primary Adhesively Bonded Structure Technology (PABST) Program was started in February 1975 for the purpose of validating the concept of adhesive bonding primary fuselage structural members together in lieu of the use of rivets. The goal of the Program was to provide a cost saving of 20 percent of the ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Chain Length Distribution on Elastomeric Properties. 2. Comparisons among Networks of Varying Degrees of RandomnessJ. R. Falender, G. S. Y. Yeh, and J. E. MarkCite this: Macromolecules 1979, 12, 6, 1207–1209Publication Date (Print):November 1, 1979Publication Histo…
Abstract Plasma polymers from some silyl amines were produced by the radio frequency of 13.56 MHz, and the surface properties were investigated. The polymers were revealed to be as hydrophobic as a plasma polymer from tetramethylsilane, which does not contain nitrogen. The hydrophobicity became effective at around 50…
The effect of temperature and steam pressure on the vaporization and corrosion of silica was studied by measuring weight loss as a function of time. The reaction rate increased exponentially with temperature up to 1200°, with a maximum rate of reaction at ∼1350°C. Above this temperature the rate abruptly decreased wit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and crystal and molecular structure of dibromo(1,4,7-triazacyclononane)copper(II)Robert D. Bereman, Melvyn Rowen Churchill, Peter M. Schaber, and Marjorie E. WinklerCite this: Inorg. Chem. 1979, 18, 11, 3122–3125Publication Date (Print):November 1, 1979Publicatio…
A series of new anisotropic magnet alloys has been developed in low-cobalt (5 - 11.5wt%) ternary Cr-Co-Fe system using a new "deformation-aging" technique that induces a strong magnetic anisotropy (Br/Bs ∼ 0.99) without magnetic field heat treatment. The prerequisite condition for the deformation-aging is a micro-stru…