Materials Literature
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For many years, study of the defect state of oxide crystals was overshadowed by activity in the alkali halides. However, during the last decade, work on oxides has emerged as an important field of study in its. own right. This burgeoning of interest came about for many reasons. First the properties of defects in the a…
A new type of highly stabilized GaAs FET oscillator using a dielectric resonator and a stabilization resistor in the feedback circuit has been developed. The oscillator fabricated with a microwave integrated circuit has a high external quality factor Q/sub ex/ for more than1000 with no hysteresis phenomena. The microw…
ADVERTISEMENT RETURN TO ISSUEPREVArticleRecent developments in ultraorientation of polyethylene by solid-state extrusionAnagnostis E. Zachariades, W. T. Mead, and Roger S. PorterCite this: Chem. Rev. 1980, 80, 4, 351–364Publication Date (Print):August 1, 1980Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA three-carbon condensative expansion. Application to musconeBarry M. Trost and John E. VincentCite this: J. Am. Chem. Soc. 1980, 102, 17, 5680–5683Publication Date (Print):August 1, 1980Publication History Published online1 May 2002Published inissue 1 August 1980https://pub…
We report a refinement of the original Bell–Dean model for vitreous silica using an energy minimization technique with a Keating force-field. Atomic coordinates are obtained for structures with several values of the oxygen bond angle in the range 130–160°. Values of the density, heat of crystallization, X-ray and neut…
ADVERTISEMENT RETURN TO ISSUEPREVArticleA van der Waals picture of the isotropic-nematic liquid crystal phase transitionWilliam M. Gelbart and Boris BarboyCite this: Acc. Chem. Res. 1980, 13, 8, 290–296Publication Date (Print):August 1, 1980Publication History Published online1 May 2002Published inissue 1 August 1980h…
Abstract Mixtures in various proportions of natural rubber (NR) and each of two tackifier resins, a poly‐β‐pinene and a modified pentaerythritol rosin ester, were used as the adhesive layer in joining a flexible polyester strip to a plane glass substrate. Measurements of the force required to peel the strip from the g…
Models are presented for the successive stages of aggregation and recombination of radiation‐induced defects in alkali halides. The construction of our models is assisted by the calculation of defect energies. We concentrate on three main areas: firstly, we consider initial aggregation of H centres, where we propose t…
Organometallic chemical vapor deposition of ZnO on sapphire, using the reaction of diethylzinc with H 2 O / H 2 , N 2 O / N 2 , and CO 2 / H 2 oxidizing gas systems, has been studied. Epitaxial films have been achieved at temperatures of 400° and 730°C, respectively, in the first two systems. The films have been chara…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn electrode modified with polymer-bound dopamine which catalyzes NADH oxidationChantal Degrand and Larry L. MillerCite this: J. Am. Chem. Soc. 1980, 102, 18, 5728–5732Publication Date (Print):August 1, 1980Publication History Published online1 May 2002Published inissue 1 Au…
The Raman spectrum of SbCl3 is studied as a function of the temperature from 20°C to 85°C both in the solid and in the liquid state. In particular the evolution of the spectra is observed near and through the solid-liquid transition. Measurements are also performed in the liquid state, under the melting temperature (s…
Abstract Es wurde der Einfluss des Wassers auf das Korrosions‐verhalten von reinem Eisen, Zink, Aluminium und gewöhnlichem 18/9 CrNi‐Stahl in HCl‐haltigem Methanol untersucht. Die Aufnahme von potentiodynamischen Stromdichte‐Potential‐Kurven und die Immersionsversuche erfolgten bei 20°C und unter Ausschluss von Sauers…
The susceptibility of polycrystalline [Fe${({\mathrm{C}}_{5}{\mathrm{H}}_{5}\mathrm{N}\mathrm{O})}_{6}$]${(\mathrm{C}\mathrm{I}{\mathrm{O}}_{4})}_{2}$ is reported over the temperature interval 40 mK-4.2 K. The observed transition temperature is 700 \ifmmode\pm\else\textpm\fi{} 10 mK, and the data have been analyzed ab…
Abstract The influence of composition on the overall rate of isothermal crystallization of isotactic random propylene/1‐butene copolymers is investigated. At a constant crystallization temperature a small fraction of 1‐butene co‐units inserted along a polypropylene chain causes a drastic reduction in the overall rate…
Semiconducting WO 3 with the donor electrons trapped in oxygen vacancies shows so-called `semiconductor-metal transition' at the triclinic-monoclinic (I) phase transition temperature at about 17°C. Resistivity discontinuities as large as a factor 10 2 have been observed at the monoclinic: (II)-triclinic phase transiti…
Abstract The Raman spectrum of a single crystal of monoclinic B‐type ( C ) gadolinium sesquioxide is presented. The low temperature polarization studies allowed the unambiguous attribution of 20 among the 21 normal modes expected according to the C 2 h factor group analysis predictions.
The effect of variations in pH from 7.2 to 8.2, dissolved oxygen from 0 to 7.5 ppm, and temperature from 4 to 25 C on the corrosion of aluminum alloy 5052 in natural sea water has been measured. The range for each of these variables corresponds to that over which it is typically found in the open ocean. Effects on bot…
Laboratory observations indicate that larvae of Pecten maximus (L.) pass through three phases of swimming behaviour before metamorphosis. Trochophores and early veligers generally swim upwards and, in shallow containers, tend to accumulate at the surface. Their swimming cilia beat without interruption so swimming is c…
Currently used recursive formulas for calculating the shock response spectra are based on an impulse invariant digital simulation of a single degree of freedom system. This simulation can result in significant errors when the natural frequencies are greater than 1/6 the sample rate. It is shown that a ramp invariant s…
A further step on the road to utilization of solar energy by cleavage of water is made possible by a new catalyst which promotes both H 2 ‐and O 2 ‐formation in the (known) Ru(bpy) /methylviologen system. The catalyst consists of RuO 2 (0.1%) in (Nb‐doped) n‐TiO 2 charged with finely divided Pt. The rate of generation…