Materials Literature
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Multifragmentation, following the formation of toroidal and bubble nuclei, is observed with an improved Boltzmann-Uehling-Uhlenbeck model for central $^{92}\mathrm{Mo}$${+}^{92}$Mo collisions. With a stiff equation of state, simultaneous explosion into several nearly equal fragments in a ringlike manner occurs due to…
The relation between catalytic ability for hydrogen evolution reaction and characteristics of nickel‐tin alloys prepared by electroplating was investigated. The catalytic ability was found to strongly depend on preparation conditions. Hydrogen overvoltage was drastically decreased with an increase of the width at half…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase separation behavior of poly(vinyl alcohol) solutions in relation to the drawability of films prepared from the solutionsMasaru Matsuo, Mutsuko Kawase, Yuri Sugiura, Satomi Takematsu, and Chisako HaraCite this: Macromolecules 1993, 26, 17, 4461–4471Publication Date (Pri…
The multiconfiguration Hartree-Fock method for continuum wave functions has been used to calculate the scattering length and phase shifts over extremely low energies ranging from 0 to 1 eV very accurately for electron-helium scattering. The scattering length is calculated very accurately with wave functions computed e…
Linear polyimides are prepared by condensation polynerization which involves the elimination of volatiles. These volatiles are responsible for severe problems encountered in the fabrication of parts, particularly thick and large components. Some success has been attained by reducing the volatile level through p-stagin…
The incommensurately modulated structures of the isostructural blue bronzes of K and Rb with modulation wavevector q = a* + 0.748 (1)b* + 1/2c* at 100 K have been determined by X-ray diffraction. The lattice parameters of the C-centred monoclinic cell for K0.3MoO3 are: a = 18.162 (2), b = 7.554 (1), c = 9.816 (1) angs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilute-solution chiral optical changes signal the thermally reversible gelation of poly(n-hexyl isocyanate) in hydrocarbon solventsMark M. Green, Chetan A. Khatri, Michael P. Reidy, and Kalle LevonCite this: Macromolecules 1993, 26, 17, 4723–4725Publication Date (Print):Augu…
The effect of sulfide (S2–) ions on the corrosion behavior of an austenitic steel (Uranus B6) in phosphoric acid (H3PO4) solutions was examined. The critical concentration at which the effect of S2– ions became perceptible was determined. Aggressive effects of the ions increased with increases in temperature and oxyge…
ADVERTISEMENT RETURN TO ISSUEPREVArticleA two-dimensional self-consistent-field model for grafted chains: determining the properties of grafted homopolymers in poor solventsKanglin Huang and Anna C. BalazsCite this: Macromolecules 1993, 26, 17, 4736–4738Publication Date (Print):August 1, 1993Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDoubly-hydrated hexafluoroacetylacetone as a tetradentate ligand: synthesis, magnetochemistry, and thermal transformations of a dimanganese(III) complexElisabeth Bouwman, Kenneth G. Caulton, George Christou, Kirsten Folting, Christophe Gasser, David N. Hendrickson, John C. H…
Cadmium sulphide thin films have been deposited chemically at near room temperature in aqueous ammonia solutions using thiourea as the sulphur source. The composition of the solution was [CdSO4] = 1.4 × 10−2M, [Thiourea] = 2.8 × 10−2 M, [NH3] = 1.74 M. The structure of the layers and the growth mechanism are studied b…
„Metallautismus”︁ ‐ dieser Begriff charakterisiert treffend den Befund, daß im adamantanoiden Eisen(III)‐Chelatkomplex 1 die vier Eisenzentren weder elektronisch noch magnetisch miteinander wechselwirken. Verbunden sind die vier Metallatome über sechs Chelatliganden 2 , die durch Deprotonierung des Kondensationsproduk…
A new method for the design of antireflection coatings is described in which a linearly constrained quadratic programming optimization procedure is used to find an inhomogeneous layer solution that, for a given overall thickness of the layer, corresponds to the global optimum for the problem. The refractive-index prof…
The application of a DC electric field (poling) to a ferroelectric lead zirconate titanate (PZT) ceramic aligns domains in the field direction. The non 180°-domain switches involve mechanical deformations, which are detected as acoustic emission signals. Concurrent with AE signals, electrical current pulses arise from…
Proteolytic degradation of glutamine synthetase (GS) in Escherichia coli is known to follow "marking" by oxidative modification. At an early stage of the degradative pathway, oxidation of His 269 and Arg 344 abolishes GS enzymatic activity. We propose a mechanism for the early stage of oxidative inactivation of GS on…
AnsrnacrBernalite is a new iron hydroxide from the Proprietary mine at Broken Hill, New South Wales, Australia.The mineral occurs as flattened pyramidal to pseudo-octahedral crystals up to 3 mm on edge with concretionary goethite and coronadite.The crystals are dark bottle green, with a vitreous to adamantine luster.B…
Abstract Thermal characteristics of radiation‐grafted FEP‐g‐polystyrene copolymer films were evaluated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The grafting of polystyrene onto FEP film introduced a two‐step degradation pattern where polystyrene degradation occurred in the ra…
The fluorescence of ${\mathrm{Pr}}^{3+}$:${\mathrm{LaCl}}_{3}$, ${\mathrm{PrCl}}_{3}$ and ${\mathrm{Nd}}^{3+}$:${\mathrm{LaCl}}_{3}$, ${\mathrm{NdCl}}_{3}$ has been measured up to pressures of 10 GPa. In addition the structural parameters of ${\mathrm{PrCl}}_{3}$ and ${\mathrm{GdCl}}_{3}$ have been obtained up to 8 GP…
The reaction of (E)-4,5-epoxy-(E)-2-heptenal with butylamine and glycine methyl ester produced brown macromolecular pigments, which showed fluorescent characteristics similar to lipofuscins. This polymerization reaction implies in the first step the formation of 1-alkyl-2-(1'-hydroxyalkyl)pyrroles (IV, VI). Compounds…
In disordered fractal or nonfractal systems, the disorder induces rapid fluctuations of the acoustical vibrational wave functions, so that statistics can be used to resolve the problem of Raman scattering from localized low-energy vibrations. We derive the expressions of light-vibration coupling coefficient, C(ω), as…