Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The free-ion energy-level schemes of the Pr3+, Nd3+, Pm3+, Sm3+, Dy3+, Ho3+, Er3+, and Tm3+ aquo ions have been determined from their absorption spectra in dilute acid solution at 25°. Energy-level assignments were made by comparison with crystal spectra, and on the basis of correlations between calculated and observe…
Measurements of the ionization losses of 10.0- to 30-keV ${\mathrm{Ge}}^{72*}$ atoms in germanium show no evidence for a cutoff for particle energies less than 23 keV, as might be expected from adiabatic arguments concerning the effect of an energy gap in germanium. The ionization loss is consistent with Lindhard's co…
A rapid and reversible transition between a highly resistive and conductive state effected by an electric field, which we have observed in various types of disordered semiconducting material, is described in detail. The switching parameters and chemical composition of a typical material are presented, and microscopic…
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…