Materials Literature
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The ESR of CrO3−4 has been studied at 4.2 K in single crystal YPO4 and YVO4. The g values and 53Cr hyperfine constants are g∥ = 1.9772, g⊥ = 1.9525, A∥ = 8.5×10−4 cm−1, A⊥ = 19.6×10−4 cm−1 for YPO4 and g∥ = 1.9773, g⊥ = 1.9511, A∥ = 8.6×10−4 cm−1, A⊥ = 18.7×10−4 cm−1 for YVO4. The resonances show an isotropic superhyp…
A discrete lattice model is used to investigate the interaction of vacancies with a dislocation in the BCC metal, molybdenum. A new interatomic potential to represent molybdenum has been produced. The formation energies and formation volumes for the vacancy and six interstitial configurations are investigated and the…
We report volume changes induced by the electrochromic process in sputtered iridium oxide films (SIROF's). We show that SIROF's expand on incorporation of water. The rate of water uptake is greatly increased by initial potential cycling, i.e. , coloring and bleaching. Hydration increases the kinetics of electrochromis…
Residual contact stresses about indentation flaws are demonstrated to have a strong deleterious effect on specimen lifetime in static fatigue. The underlying basis of conventional fatigue analysis is first examined critically and is argued to be deficient in the way the stress intensity factor for the flaws is related…
Abstract The stress‐strain characteristics of poly(ethylene terephthalate) fibers, heat set under different conditions have been studied under tension, and mechanical properties such as tenacity, yield point, elongation at break, and work of rupture are presented and discussed. An attempt has been made to correlate th…
A quantitative picture of the geometric and energetic trap structure of positively corona charged polyfluoroethylenepropylene (Telfon FEP-A) was obtained by a combination of isothermal and thermally stimulated current measurements in ’’open circuit.’’In addition the heat-pulse method was used to determine the mean dep…
Fatigue-crack propagation rates (d a /d N ) and fatiguecrack ‘thresholds’ ∆Kth have been studied in copper alloys (Cu-2Al, Cu-4Al, and Cu-8Al) of various grain sizes. Propagation rates are slower in fine-grained material and ∆Kth appears to vary in a linear manner with (grain diameter)−1/2, in much the same manner as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSolubility behavior of three aromatic hydrocarbons in distilled water and natural seawaterSteven S. Rossi and William H. ThomasCite this: Environ. Sci. Technol. 1981, 15, 6, 715–716Publication Date (Print):June 1, 1981Publication History Published online1 May 2002Published iniss…
ABSTRACT An alternative form, y = An mc e −cn , of the lactation model of Wood, y = An b e −cn , is suggested. The new parameter, m, is the time required to achieve maximum milk yield. The correlations between non-linear parameters are reduced.
Abstract A simple procedure is described for the rapid, quantitative analysis of dicyandiamide in epoxy resins and epoxy resin prepregs. High performance liquid chromatography is used to analyze for dicyandiamide and to investigate the solubility behavior of dicyandiamide and 3‐( p ‐chlorophenyl)‐1,1‐dimethylurea (Mon…
Measurements of the magnetic susceptibility ($\ensuremath{\chi}$) using low-field electron spin resonance over the temperature range $30 \mathrm{mK}<T<300 \mathrm{K}$ are reported for a polycrystalline sample of quinolinium-di-tetracyanoquinodimethanide, as well as over a more limited range in $T$ for two other…
Abstract Copolymers of styrene with vinylphenyl trifluoromethyl carbinol, p ‐vinylphenyl trifluoromethyl carbinol, vinylphenyl hexafluorodimethyl carbinol, and p ‐vinylphenol are conditionally compatible with poly(ethylene oxide), depending on their composition and blending ratios, whereas copolymers of styrene and vi…
The brittle fracture behavior of round-notched poly(methyl methacrylate), poly(vinyl chloride), and polystyrene bars has been studied at varying temperatures and bending rates. Brittle fracture originating from internal crazes occurs in a restricted range of temperature. When the plastic deformation zone at the tip of…
High-resolution x-ray measurements (error \ensuremath{\sim}200-400 ppm) of smectic layer spacing $d$ of six homologs (TB3A-TB8A) of terephthal-bis-($4n$)-butylaniline (TBBA) have been made as a function of temperature. In the smectic-$C$ phase, the exponent of the tilt angle for TB3A and TBBA has a value close to $\fr…
A survey of the instabilities of switching voltage regulators with different types of current-mode controllers (including LC3or constant-hysteresis; MC2or constant-frequency and constant off-time versions) is presented. Apart from the well-known open-loop oscillation of the constant frequency regulator above 50% duty…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmination of .pi.-allylpalladium chloride complexes. A mechanistic studyBjorn Åkermark, Gunilla Åkermark, Louis S. Hegedus, and Krister ZetterbergCite this: J. Am. Chem. Soc. 1981, 103, 11, 3037–3040Publication Date (Print):June 1, 1981Publication History Published online1 M…
A systematic comparative study of several series of chemically neighbouring compounds apt to give a reentrant mesomorphism is proposed. Experimental data concerning the various reentrant phases are summed up. From these observations various factors favourable to the occurence of the reentrance are revealed. Thus, the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of thermal decomposition of diethylbis(triethylphosphine)platinum(II)Thomas J. McCarthy, Ralph G. Nuzzo, and George M. WhitesidesCite this: J. Am. Chem. Soc. 1981, 103, 12, 3396–3403Publication Date (Print):June 1, 1981Publication History Published online1 May 200…
A method is described for measuring the mass/length or mass of molecular assemblies by comparative electron scattering in the STEM. Standard particles whose mass is well established (e.g. TMV or fd bacteriophage) are deposited on the electron microscope grid together with the sample to be measured. Images containing a…
The luminescence properties of the Bi 3+ ion as an activator in the series of compounds and vary considerably with the host lattice composition. The Stokes shift of the emission varies from 1500 cm −1 in the case of to 12,800 cm −1 in the case of . The large variation of the position of the emission band is ascribed t…