Materials Literature
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X-ray diffraction, M\"ossbauer spectroscopic, and magnetic susceptibility measurements have led to a determination of the phase diagram including magnetic phases of the system ${({\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x})}_{2}{\mathrm{O}}_{3}$, $0\ensuremath{\le}x\ensuremath{\le}0.63$, the limit of ${\mathrm{F…
The $4{f}^{n}\ensuremath{\rightarrow}4{f}^{n\ensuremath{-}1}5d$ absorption spectra of rare-earth ions, R${\mathrm{E}}^{2+}$ or R${\mathrm{E}}^{3+}$, in crystals can be fitted with energy gaps in the ground multiplets of the $4{f}^{n\ensuremath{-}1}$ core. Unlike the shielded $4{f}^{n}$ configuration, the $4{f}^{n\ensu…
Radiative lifetimes of the six lowest-energy $J=1$ levels of Ar I have been measured using a pulsed electron technique. The wavelengths and measured lifetimes in nanoseconds are 1066.66, 8.60 \ifmmode\pm\else\textpm\fi{} 0.4; 1048.22, 2.15 \ifmmode\pm\else\textpm\fi{} 0.2; 879.95, 10.1 \ifmmode\pm\else\textpm\fi{} 0.4…
Samples in the Bi–Te system containing 59.0, 58.0, 57.0, 55.0, 51.0, and 50.0 at.% Te, in addition to 5 samples within the Bi2Te3 homogeneity range, have been equilibrated near 525 or 450°C and room temperature powder diffraction patterns taken. There are now 4 known phases in the 50–60 at.% Te region. The 59.0 and 58…
Technical Briefs Effect of Transverse Curvature on Skin Friction and Heat Transfer in Laminar Flows Past Slender Circular Cylinders T. Cebeci, T. Cebeci Mechanical Engineering Department, California State College at Long Beach, Long Beach, Calif; Aerodynamics Research Group, McDonnell Douglas Corporation, Douglas Airc…
The asymptotic spherical aberration and distortion coefficients of electron lenses always depend upon the position of the object, or the magnification, in a very simple way, and furthermore the quantities that specify the distortion are closely related to those giving the spherical aberration. These relationships are…
The oxidative photolysis of polyvinylpyrrolidone with light of λ = 2537 Å has been studied over a range of oxygen pressures and polymer concentrations. The results show that chain scission and cross linking take place simultaneously. In the range where cross linking is a negligible component, a mechanism based on chai…
The yield stress data of irradiated Ferrovac iron are shown to be closely approximated by the expression Δ[sgrave]=A[1—exp (—Bφt)]1/2 with a saturation exposure of 2 × 1019 nvt (E > 1·45 MeV). The maximum increment in the yield stress is 25 000 p.s.i. and the volume of the defect calculated from B is 4·4 × 10−19 cm3.…
A method is presented for obtaining the far-field diffraction pattern of a plane aperture when the mutual coherence function of the illumination contains a quadratic phase term. The method is applied to obtain the diffraction pattern of a slit and circular aperture illuminated by an extended quasimonochromatic incoher…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolybdovanadophosphoric acids and their salts. II. Investigation of solution propertiesCalvin J. Hallada, George A. Tsigdinos, and B. S. HudsonCite this: J. Phys. Chem. 1968, 72, 12, 4304–4307Publication Date (Print):November 1, 1968Publication History Published online1 May…
Abstract 9,10‐Bis(hydroxymethyl)triptycene, 9,10‐dihydro‐9,10‐bis(hydroxymethyl)‐9,10‐ethanoanthracene, 9,10‐dihydro‐9,10‐bis(hydroxymethyl)‐9,10‐(2,3‐bicyclo[2.2.1] heptano)‐anthracene, 9,10‐dihydro‐9,10‐bis(hydroxymethyl)‐ N ‐phenyl‐9,10‐ethanoanthracene‐11,12‐dicarboximide, and 9,10‐bis(carbethoxy)triptycene have b…
Abstract Energy density to break measurements on a number of polymers, either partly swollen or dry, reveal that there is a simple relationship between the energy density to break and the hysteresis obtained in the first stress strain cycle taken very near to break. The hysteresis at break was varied by changing the t…
The early stages of growth of oxide films on a Cu–26 wt.-% Zn alloy and their later development into thick scales have been studied by metallography and electron probe microanalysis. Thick scales have been examined conventionally in cross-section whereas thin films, about 1000–5000 Å thick, have been examined in plan.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanide picolinate chelate stabilitiesJ. E. Powell and J. W. IngemansonCite this: Inorg. Chem. 1968, 7, 11, 2459–2461Publication Date (Print):November 1, 1968Publication History Published online1 May 2002Published inissue 1 November 1968https://pubs.acs.org/doi/10.1021/ic…
(1968). The Oxidation of UC and UN Powder in Air. Journal of Nuclear Science and Technology: Vol. 5, No. 11, pp. 600-602.
An account is given of the measurement of the transverse deformation of fibres under various loads acting normal to the fibre longitudinal axis by a technique in which fibres are interleaved between glass plates in a vertical stack. Graphs of transverse load against compression are plotted for nylon, acrylic, and visc…
A rapid and convenient method is described for the accurate determination of the thickness of carbon films from their optical density. A linear relationship was found between optical density and film thickness. The optical-density-thickness curve was calibrated by direct measurement of the thickness of transverse sect…
Abstract Styrene was graft‐copolymerized onto wood cellulose by the ceric ion method of Mino and Kaizerman. The grafting reaction was found to depend strongly on the concentration of ceric ion in the grafting system and maximum grafting occurred in a narrow range of concentration of initiator, 1.0 × 10 −3 ‐1.8 × 10 −3…
Phase relations in the binary system K 2 O‐GeO 2 were determined by conventional quenching techniques. Three compounds, K 2 O.2GeO 2 , 3K 2 O.11GeO 2 , and K 2 O.7GeO 2 , exist in the composition range 65 to 100% GeOn. The compound 3K 2 O.1lGeO 2 melts congruently at 1055°C, whereas K 2 O.2GeO 2 and K 2 O.7GeO 2 melt…
Deformation mechanism of the elastic region which follows the nonlinear frictional region in shearing of plain-weave fabrics is analyzed, and the elastic shear modulus is determined in terms of the mechanical properties of the yarn and the geometrical parameters of the fabric. The mechanical behavior of the three-dime…