Materials Literature
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Abstract Es wurden mit einem Lichtstreuphotometer die Orientierungs‐ und Dichtefluktuationen in den amorphen Polymeren «Polycarbonat» (Poly(oxycarbonyloxy‐1,4‐phenylenisopropyliden‐1,4‐phenylen)) und Polystyrol in Abhängigkeit von der Temperatur untersucht. Ferner führten wir ergänzende Messungen an Oligomeren des Pol…
Abstract Electron spin resonance (ESR) spectroscopy is used to investigate the nature of exchange sites on kaolinite. ESR spectra of exchangeable Cu 2+ and Mn 2+ on kaolinite indicate that divalent exchange ions are about 11–12Å apart on kaolinite surfaces and that planar Cu (H 2 O) 4 2+ ions are oriented parallel to…
Abstract The composition of the terpenic alcohol and sterol fractions of the unsaponifiables of ten algal species, five Myxophyceae and five Chlorophyceae , is discussed. The major component of the terpenic fraction is phytol, a diterpenic alcohol. Minor amounts of straight chain and triterpenic alcohols are also pres…
Transmission and scanning electron microscopes were used to investigate the cause of brittleness of electroless copper deposits. Numerous voids were found in brittle deposits, whereas ductile deposits contained significantly fewer voids. These voids were 20–300Å in diameter and randomly distributed within a grain. Low…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects on the oxidation-reduction reactions of nickel para-substituted tetraphenylporphyrin in nonaqueous mediaKarl M. Kadish and Mark M. MorrisonCite this: Inorg. Chem. 1976, 15, 4, 980–982Publication Date (Print):April 1, 1976Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpoxidation of olefins with molecular oxygen in the presence of cobalt complexesRichard A. Budnik and Jay K. KochiCite this: J. Org. Chem. 1976, 41, 8, 1384–1389Publication Date (Print):April 1, 1976Publication History Published online1 May 2002Published inissue 1 April 1976…
A new paramagnetic center was produced by 550-kV electrons in hexagonal boron nitride. It is shown that this center is a three-boron center and consists of an electron trapped in a nitrogen-ion vacancy ($F$ center). The hyperfine interaction was found to be anisotropic with ${A}_{\ensuremath{\perp}}=40.0\ifmmode\pm\el…
A detailed study of changes in the internal fields at Mn, Fe, and Si nuclei in the solid solutions of ${\mathrm{Fe}}_{3\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{Si}$, $0\ensuremath{\le}x\ensuremath{\le}1.6$, as a function of composition has been made by spin-echo NMR at 1.28 K and in zero external magnetic field. Reson…
At about 810\ifmmode^\circ\else\textdegree\fi{}C niobium dioxide undergoes an apparently second-order transition between a high-temperature (HT) rutile structure and a low-temperature (LT) phase whose structure is slightly distorted from rutile. The primary order parameters of the transition are the amplitudes of sinu…
Electrical properties of amorphous evaporated electrochromic (molybdenum trioxide) films were studied in various ambients. It is shown that at a given applied voltage there is a "humidity threshold" below which coloration does not occur. The transient behavior of the current and remnant voltage in low humidity (precol…
Abstract The XPS studies of chromia–alumina catalysts were carried out to elucidate the surface of these catalysts. Photoreduction was found to occur during the XPS measurements. Therefore, all spectra were measured rapidly to prevent any photoreduction. It was found that the information about the spin-orbit splitting…
Longitudinal and transversal magnetostrictions of rapidly quenched amorphous alloys in (Fe_<1-x>Co_x)_<80>P_<13>C_7 and (Fe_<1-x>Co_x)_<75>-Si_<15>B_<10> systems were measured in the saturation magnetization region at room temperature. Forced magnetostrictions of these alloys were also measured in the magnetic field u…
Both Raman scattering and infrared reflectivity measurements have been performed to determine the optic-mode spectrum of orthorhombic ${\mathrm{KNbO}}_{3}$ at room temperature. Pincipal-axis phonons and oblique phonons were observed with a combination of 90\ifmmode^\circ\else\textdegree\fi{} scattering, back scatterin…
Transient charge and discharge currents in oriented PET films (Melinex) were measured over a wide range of temperature and electrical stresses. Some limited studies of the nature of these current transients were also made by varying parameters such as electrode material and the sample thickness. Isochronal characteris…
Some electrochemical aspects of the stress corrosion cracking (SCC) behavior of ASTM A517 Grade F steel in liquid ammonia environments at 25 C have been studied. Electrode potentials were measured during SCC tests by means of thallium/saturated thallous chloride/ammonia reference half cell. The effects of controlled a…
The large and small subunits of Escherichia coli glutamate synthase were isolated. The small subunit catalyzes the NH(3)-dependent synthesis of glutamate. The large subunit exhibits glutaminase activity.
The spontaneous magnetization and principal susceptibilities of the rare-earth orthochromites ${\mathrm{TbCrO}}_{3}$ and ${\mathrm{PrCrO}}_{3}$ are studied in the temperature range $4.2\ifmmode^\circ\else\textdegree\fi{}\mathrm{K}\ensuremath{\le}T\ensuremath{\le}{T}_{N}$. For the case of ${\mathrm{PrCrO}}_{3}$ the fie…
Cotton fibers blended to give three levels of fiber maturity were mercerized in anhydrous liquid ammonia and in sodium hydroxide solution, slack and under tension. Both reagents produced similar changes in the cottons, but to differing degrees. Both ammonia and caustic treatments produced changes in morphology (swolle…
A computer-oriented strategy has been developed for simultaneous evaluation and correlation of thermodynamic data on groups of chemically related species. A general empirical equation for the temperature dependence of the heat capacity of a species and derived functional relations for entropy, enthalpy, free energy, e…
The optical absorption spectra in 2-butanol have been studied. The position of the absorption peak which is attributed to surface plasmons of small alloy particles depends on the composition of the alloy. The spectra obtained are qualitatively in agreement with those calculated by Mie's equation.