Dialkylmagnesium Compounds from Magnesium, Hydrogen, and 1‐Alkenes
Abstract The complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982 , 457. DOI: 10.1002/anie.198204570
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Morphology-Property Relationships in EPDM-Polybutadiene Blends
Abstract When mixing EPDM and BR in the Brabender a heterogeneous blend results; the dispersed phase is first sheared into fibrous strands and then broken down into micron sized particles. At low doses of irradiation, the morphology of the blend only has a minor effect on the energy to break, whereas at high doses the…
On the new mineral theophrastite, a nickel hydroxide, from Unst, Shetland, Scotland
Abstract The new mineral theophrastite, Ni(OH) 2 , from Unst, is Mg-bearing and occurs associated with a very poorly crystalline Ni-containing mixed hydroxide of the pyroaurite type and/or zaratite on chromitite. X-ray powder diffraction data show a shift in d spacing toward brucite compared with pure Ni(OH) 2 . Infra…
Optical and Raman spectra of single crystals of perylene-TCNQ charge transfer complexes
Optical transmission and reflection measurements are reported for the quasi one dimensional solids perylene-TCNQ (P1T1) and (perylene) 3 -TCNQ (P3T1) in the region from 300 to 1200 nm. Raman spectra of single crystals of both compounds were obtained from 20 to 3000 cm −1 . With 457.9 nm excitation, combinations and ov…
Unusual electronic spectra of the pseudotetrahedral complex [tris(3,5-dimethyl-1-pyrazolyl)ethylamine]cobalt(II) bis(tetraphenylborate)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual electronic spectra of the pseudotetrahedral complex [tris(3,5-dimethyl-1-pyrazolyl)ethylamine]cobalt(II) bis(tetraphenylborate)Lucia Banci, Cristiano Benelli, Dante Gatteschi, and Fabrizio ManiCite this: Inorg. Chem. 1982, 21, 3, 1133–1136Publication Date (Print):Mar…
Glass transition temperatures of ABA poly(styrene‐b‐isoprene) block copolymers by differential scanning calorimetry
Abstract The glass transition behavior of two sets of ABA poly(styrene‐ b ‐isoprene) block copolymers was examined by differential scanning calorimetry. In one series, the triblock copolymers had different total molecular weights and the same (30 wt %) polyisoprene content, in the other, the molecular weight was const…
Gypsum Precipitation by Mixing Seawater Brines
ABSTRACT Experiments indicate that gypsum can be precipitated by the mixing of seawater brines of different stages of evaporation, in addition to the previously recognized mechanisms of direct evaporative crystallization and crystallization due to temperature changes. A proposed geologic model shows how gypsum precipi…
High-temperature susceptibility of cobalt and manganese aluminosilicate glasses
The magnetic susceptibility for 14.3 at.% Mn and 14.3 at.% Co aluminosilicate glasses has been measured via a sensitive pendulum magnetometer from 4 to 300 K in a field of 5 kOe. For temperatures above 80 K a Curie–Weiss law was obeyed in both systems; however, below 80 K strong deviations from this law occurred. From…
Namuwite, (Zn,Cu)4SO4(OH)6.4H2O, a new mineral from Wales
Abstract Found on a specimen in the mineral collection of the National Museum of Wales, no. NMW 27.111.GR414, from the Aberllyn mine, Llanrwst mining field, North Wales, with hydrozincite on a breccia cemented by sphalerite, quartz, calcite, and ankerite. Atomic absorption and TGA analyses gave ZnO 37.8, CuO 22.0, SO…
A general theory of X-ray intensity statistics for twins by merohedry
A general theory of X-ray intensity statistics for twins by merohedry is developed based on mathematical analogy of this problem to a one-dimensional random walk. Probability distribution functions are derived (a) for intensities from a single twinned specimen, and (b) for the differences in intensities from two separ…
Temperature dependence of the magnetostriction in SmxDy1−xFe2 compounds
The temperature dependence of the magnetostriction from 80–300 K, as a function of applied field, was investigated in a series of SmxDy1−xFe2 (x = 0.86, 0.70, 0.55, 0.40, and 0.20) polycrystalline compounds. Large strains are observed in Sm0.86Dy0.14Fe2 with λ∥−λ⊥ = −1688×10−6 at room temperature and −2725 ppm at 80 K…
The Influence of Carbon Black on the Reversion Process in Sulfur-Accelerated Vulcanization of Natural Rubber
Abstract The effect of carbon black upon the reversion process in the sulfur-accelerated vulcanization of natural rubber has been studied. It is found that black-filled cure systems have a faster rate of vulcanization and better reversion resistance. The net decrease of trans -methine content, which is equivalent to t…
Significance of clays in the petroleum geology of the Niger Delta
Abstract Sediments of the Tertiary Akata and Agbada Formations have been studied by mineralogical and petrographic techniques. In the Akata and Agbada shales the clays are largely detrital, with only minimal alteration attributable to the effects of burial diagenesis. Clay minerals occur in minor (<10%) amounts in…
Magnetic properties of amorphous GdFeB and GdCoB alloys
Studies have been made of the magnetization of GdFeB and GdCoB amorphous thin films in which ratios of Gd to transition metal and B to transition metal were varied. In GdCoB alloys the Co moment decreases as the sum of the B and Gd concentration increases. Assuming a charge transfer mechanism, each Gd contributes 1.4…
Corrosion and corrosion inhibition in the petroleum industry
Abstract This lecture reviews some representative types of aqueous corrosion problems encountered in the various facets of the petroleum industry. The fundamental processes underlying these corrosion problems are examined. In addition, commonly used methods for corrosion prevention and control which rely on modificati…
Phenomenological theory of magnetostriction in amorphous ferromagnets
A single-ion anisotropy mechanism is considered to discuss the volume average of magnetostriction in macroscopically isotropic amorphous ferromagnetic alloys. Within the framework of our phenomenological theory, the macroscopic magnetostrictive strain vanishes only if the volume average of the local anisotropy coeffic…
Stress Wave Propagation in a Bar of Arbitrary Cross Section
In this paper a method for solving wave propagation problems of an infinite bar of arbitrary cross section has been presented. The frequency equation for finding phase velocites for longitudinal, torsional, and flexural waves have been obtained by making use of the Fourier expansion collocation method which has been d…
Static magnetic properties of(CH3)4NMnxCu1−xCl3, a quantum ferromagnetic chain with classical impurities: Experiment and theory
The magnetic susceptibility of the mixed quasi-one-dimensional system ${({\mathrm{CH}}_{3})}_{4}\mathrm{N}{\mathrm{Mn}}_{x}{\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{Cl}}_{3}$ has been measured down to 0.32 K for $x$ ranging between 0 and 1. At 4.2 K the susceptibility starts to increase with $x$ up to $x\ensuremath{\si…
Liquid immersion method for the measurement of the refractive index of a simple lens
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text G. Smith, "Liquid immersion method for the measurement of the refractive index of a simple lens," Appl. Opt. 21, 755-757 (1982) Export Citation BibTex…
Electron paramagnetic resonance study of nitrogen-bridged iron porphyrin dimers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron paramagnetic resonance study of nitrogen-bridged iron porphyrin dimersLawrence A. Bottomley and Barry B. GarrettCite this: Inorg. Chem. 1982, 21, 3, 1260–1263Publication Date (Print):March 1, 1982Publication History Published online1 May 2002Published inissue 1 Marc…