Materials Literature
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The effect, of fiber diameter and crimp frequency on the filtration performance of nonwoven fabrics were examined empirically. It was found that if fabric weight and density are kept constant, air permeability varies linearly with fiber diameter. When filtering a very dilute aerosol of submicron particles, the capture…
Article A Study of Hydrogen Diffusion in Titanium Hydride using Nuclear Magnetic Resonance Techniques* was published on February 1, 1979 in the journal Zeitschrift für Physikalische Chemie (volume 115, issue 2).
Electrical resistivity in c-direction (ρ c ) as a function of temperature ( T ) has been investigated of a number of highly crystalline specimens of kish and pyrolytic graphites in relation to their structural perfection evaluated by the basal-plane resistivity ratio between 300 K and 4.2 K ( R T =ρ a (300)/ρ a (4.2))…
Methods are developed to treat the nonlinear propagation of edge dislocations in atomic lattices. Static or low-velocity calculations incorporate Eshelby’s analytic solution of the elastic equations. At higher, even transonic velocities, a novel fixed-displacement boundary is used to allow steady-state propagation of…
The electrooxidation of sulfur in AlCl 3 ‐ NaCl ( 63 – 37 mole percent ) has been investigated in the temperature range 150°–250°C. The oxidation of sulfur proceeds from S 8 to SCl 3 + and involves intermediates S 8 + ( S 16 2 + ) , S 8 2 + , and S(I).
Abstract The exciton reflection spectra of free tetracene single crystals and those in optical contact with different substrates (quartz, glass, muscovite) are measured in polarized light at temperatures ranging from 300 to 4.2 K. Peculiarities in the reflection spectra of a free crystal are due to a phase transition…
Abstract The thermochemical and flammability characteristics of laminating resins and composites currently in use and others being considered for use as aircraft interior panels are described. The properties studied included: (a) limiting oxygen index of the composite constituents; (b) fire containment capability of t…
Abstract The dispersion of Pd, Rh, and Ir supported catalysts had been studied by means of oxygen‐hydrogen chemisorption and high resolution electron microscopy. The good agreement among the methods had been obtained for catalysts with well‐dispersed active phase (crystallites 1–6 nm). It confirmed the simple adsorpti…
The vibrational structure derived from the Γ7(2 T 2g ) → Γ8(4 A 2g ) phosphorescence spectrum at liquid nitrogen temperature of a number of cubic host crystals A2BX6 (A = K, Rb, Cs; B = Pt, Sn, Pb, Te; X = Cl, Br) doped with ReCl6 2- has been investigated. The best resolved spectra were obtained for those host crystal…
Fundamental waveguiding properties of As-Se-S-Ge chalcogenide glass films and some applications to passive waveguide components are presented. The refractive index of the chalcogenide glass film annealed just below the glass transition temperature (200 degrees C) increases by light irradiation near the absorption edge…
In order to use XLPE in dc cable insulation, it isnecessary to solve various problems about space chargein XLPE insulation. The cross-section dust figure (CDF)is introduced as a new method to study a space chargedistribution in solid insulations and new results arepresented. The XLPE insulation layer is mostly occupie…
The crystal structure analysis of the low temperature phase of SrTiO 3 has been made at 77 K using the method of X-ray oscillation photograph. The space group is determined as I4/mcm and the rotational shift of oxygen octahedra with respect to Sr ion frame is by 1.6°; this is slightly larger than those estimated from…
Abstract This work is concerned with the change of viscoelastic properties of poly(vinyl chloride) (PVC) plastisol during heating. The system changes from a suspension of solid particles in a liquid medium to a swollen gel and further to a fused state as the temperature is raised. The Rheometrics mechanical spectromet…
Particle-stimulated nucleation of recrystallization in copper-silver alloys containing silica particles has been studied by high-voltage electron microscopy. Both bulk annealed and in situ annealed specimens have been examined and the results compared with those obtained from similar studies of deformed aluminium. Rec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron transfer and ligand substitution reactions of the ion pentacyano(4-aminopyridine)ferrate(II)Nicolas V. Hrepic and John M. MalinCite this: Inorg. Chem. 1979, 18, 2, 409–413Publication Date (Print):February 1, 1979Publication History Published online1 May 2002Publishe…
Phosphoglycerate mutase of Bacillus subtilis was purified to apparent homogeneity. It specifically required manganese ions for stability and activity, but it does not need 2,3-diphosphoglycerate as cofactor; the Km for Mn2+ is about 4.5 micrometer. Enzyme activity was inhibited by heavy-metal ions, 2,3-butanedione, an…
The diffuse-cone model, developed on the basis of the existence of orientational disorder in smectic phases, is valid for all smectic A and C phases, and also, with appropriate modifications, for all other smectic phases. The fundamental angular parameter is not the optical tilt angle τ, but the preferred molecular ti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical oxidation of some mesocyclic dithioethers and related compoundsGeorge S. Wilson, Dale D. Swanson, Jacob T. Klug, Richard S. Glass, Michael D. Ryan, and W. Kenneth MuskerCite this: J. Am. Chem. Soc. 1979, 101, 4, 1040–1042Publication Date (Print):February 1, 1…
Abstract It is shown that under conditions of uniaxial creep the fracture of high density polyethylene can be categorized as one of three types, depending upon the magnitude of the applied load, molecular architecture, and environment. When subjected to relatively large loads, the specimens neck and then fracture almo…
Cathodoluminescence of Sm 3+ , Eu 3+ , and Yb 3+ in is known to be enhanced by a trace of Tb 3+ or Pr 3+ . Nd 3+ , Gd 3+ , Dy 3+ , Ho 3+ , Er 3+ , and Tm 3+ show similar enhancement of efficiencies by addition of Tb 3+ or Pr 3+ . For an electron beam with a current density of about 10 −4 A/cm 2 , in a raster of about…