THE KINETICS OF THIXOTROPIC BEHAVIOUR IN CLAY/KAOLIN AQUEOUS SUSPENSIONS
(1982). THE KINETICS OF THIXOTROPIC BEHAVIOUR IN CLAY/KAOLIN AQUEOUS SUSPENSIONS. Chemical Engineering Communications: Vol. 17, No. 1-6, pp. 13-22.
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Deactivation by carbon of nickel, nickel-ruthenium, and nickel-molybdenum methanation catalysts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeactivation by carbon of nickel, nickel-ruthenium, and nickel-molybdenum methanation catalystsA. Douglas Moeller and Calvin H. BartholomewCite this: Ind. Eng. Chem. Prod. Res. Dev. 1982, 21, 3, 390–397Publication Date (Print):September 1, 1982Publication History Published o…
Some evidence against the existence of the liquid‐liquid transition. IV. The temperature dependence of shear viscosity
Abstract The viscosity data available for four anionically polymerized polystyrenes ranging in molecular weight from 1100 to 47,000 for the temperature range T g to T g + 100°C have been fitted by computer programs to both the Vogel, Fulcher, Tamman, and Hesse (VFTH) equation and to two optimum intersecting Arrhenius…
Phengitization, sericitization and potassium-beidellite in a hydrothermally-altered granite
Abstract X-ray diffraction, optical and microprobe studies of a kaolinized oligoclase—orthoclase—two-mica—granite (Southern Armorican Massif) indicated that low-temperature metasomatism had produced three series of minerals. 1. Partial alteration of muscovite resulted in the formation of ferrous-magnesium-phengite. Bi…
The effect of antisymmetric exchange on the E.P.R. spectra of coupled pairs of transition metal ions
The antisymmetric exchange term (AET) in the exchange spin hamiltonian, d. S1×S2 , can have sizeable effects on the EPR spectra of hetero-dinuclear transition metal complexes. In this paper we review briefly the symmetry aspects of the AET and give a general formulation for its matrix elements for any pair of S 1, S 2…
Beiträge zum 121Sb‐Mößbauer‐Effekt. V. Triorganoantimon‐Chalkogenderivate Die Kristallstruktur von Ph3SbS
Abstract Die bei 4,2 K aus dem 121 Sb‐Mößbauer‐Effekt ermittelten Meßparameter der Isomerieverschiebung und der Quadrupolaufspaltung werden für Me 3 Sb(OH) 2 ( I ), Me 3 SbO ( II ) und Ph 3 SbS ( III ) mitgeteilt. Danach ergeben sich für I und II trigonal‐bipyramidale Umgebung der Sb‐Atome mit den Methylgruppen in äqu…
Optical transitions ofEr3+ions in RbMgF3and RbMgF3: Mn
Optical absorption, emission, and excitation spectra, as well as lifetime values, are presented for ${\mathrm{Er}}^{3+}$ ions in RbMg${\mathrm{F}}_{3}$. Previous workers have demonstrated that ${\mathrm{Er}}^{3+}$ ions can reside in a number of different site symmetries in crystalline hosts such as Ca${\mathrm{F}}_{2}…
The influence of CT states and energy transfer on the luminescence of Ln2[Pt(CN)4]3⋅yH2O single crystals
Time resolved emission measurements of Ln2[Pt(CN)4]3⋅yH2O single crystals (LnCP) at T = 1.9 K are reported. The time dependence of the E⊥c polarized emission of these crystals—with the exception of LuCP—deviates considerably from that of other tetracyanoplatinates (MCP, M≠Ln). The results can be explained assuming an…
Reinforcement of Rubber by Carbon Black
Abstract The mechanism by which carbon black reinforces elastomers is one of the most interesting problems of modern technology and still a subject of much speculation. The effect itself was discovered by S. C. Mote of the India-Rubber, Gutta-Percha and Telegraph Works Co. of Silvertown, near London, as a result of an…
EPIPHYTES ON CLADOPHORA GLOMERATA IN THE GREAT LAKES AND ST. LAWRENCE SEAWAY WITH PARTICULAR REFERENCE TO THE RED ALGA CHROODACTYLON RAMOSUM (= ASTEROCYTIS SMARGDINA)1
ABSTRACT The range of Cladophora glomerata 2 along the east and north shorelines of the Great Lakes and St. Lawrence Seaway extends form just east of Montreal to Thunder Bay on Lake Superior. However, it does not occur at sites sampled in Georgian Bay, the North Channel or eastern Lake Superior. The dominant epiphytes…
Charge transfer and155Gd isomer shift in various intermetallic compounds of Gd
The isomer shift observed by means of 155 Gd Mossbauer spectroscopy in intermetallic compounds composed of Gd and one of the metals M=Al, In, Pb, Sn, Zn, Cu, Ni, Co, Fe or Mn was analysed in terms of a model proposed earlier for the 197 Au isomer shift in Au based materials by Miedema and van der Woude (1980). In comb…
Devolatilization of polymer melts in single‐screw extruders
Abstract Polymer melt devolatilization (DV) was studied using a single‐screw extruder with extruder RPM and polymer flow‐rate as the key parameters varied. DV efficiency was studied at atmospheric pressure under nitrogen and also at reduced pressure. Preliminary results are applied to current mathematical models.
Effects of Electron Irradiation on Electrical Conductivity of Polyacetylene
Influence of electron beam irradiation on the electrical conductivity of I 2 doped trans-(CH) x and its temperature dependence are studied. The electrical conductivity of I 2 doped sample decreases and its activation energy increases with increasing irradiation dose. Imperfections such as chain breaks or cross-linking…
Models for cobalt(II)-substituted zinc metalloenzymes. 2. Comparisons of the crystal structures of complexes of the type [M(RCOO)2(2-X-Im)2] (Im = imidazole; M = Co, Zn; R = CH3, C2H5, C3H7; X = CH3, C2H5). An unusual type of linkage isomerism
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for cobalt(II)-substituted zinc metalloenzymes. 2. Comparisons of the crystal structures of complexes of the type [M(RCOO)2(2-X-Im)2] (Im = imidazole; M = Co, Zn; R = CH3, C2H5, C3H7; X = CH3, C2H5). An unusual type of linkage isomerismWilliam D. Horrocks Jr., Joseph…
Effects of Burning on the Algal Communities of a High Desert Soil near Wallsburg, Utah
A recently burned area near Wallsburg, Wasatch County, Utah, was sampled to determine if differences existed between the soil algal flora of a burned area and that of an adjacent ecologically similar unburned area. Soil samples were cultured and analyzed to determine presence and relative frequency of living algae. Th…
Magnetization of YbFe2O4+x
Magnetizations of hexagonal compounds YbFe 2 O 4+ x (polycrystals with x =-0.027, -0.003 and +0.015 and a single crystal with x =+0.03) have been measured in a temperature range between 4.2 K and room temperature. Remanent magnetizations are induced by magnetic fields applied during cooling below about 250 K. Dependen…
Characterization of soil structure and stability using modulus of rupture - exchangeable sodium percentage relationships
Measurements of the modulus of rupture (MOR) and in particular of the way in which it changes for a given soil with change in exchangeable sodium percentage (ESP) from zero to 20, have been used to characterize the structural stability of a range of soils from the Western Australian wheat-belt. For convenience soils w…
Polarity and inversion twins in ZnSe crystals observed by high-resolution electron microscopy
Zinc selenide crystals (zinc-blende structure) with (110) surface planes, produced by a solid–solid reaction, have been examined by means of a multi-beam lattice-imaging technique in a 200 kV electron microscope with a pole piece of C s = 1·2 mm, and by simulaton using the multi-slice method. In the experimental image…
The association of the surface array and the outer membrane of Deinococcus radiodurans
The hexagonal surface array of Deinococcus radiodurans strain Sark exhibits remarkably strong bonding of its subunits and association with the outer membrane. The array is not dissociated nor is it separated from the outer membrane by reagents that disrupt hydrogen bonds (urea, guanidine hydrochloride), ionic bonds (p…
Nuclear relaxation studies of the role of the essential metal in glyoxalase I.
Glyoxalase I, a Zn'+-metalloenzyme, induces the slow exchange of the lactoyl Cz proton of the reaction product S-(D-lactoyl)glutathione with the deuterium of 2Hz0, indicating a partial reversal of the enzymatic reaction and confirming a proton transfer mechanism for the isomerization.Paramagnetic effects of the Mn2+su…