Materials Literature
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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}…
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…
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…
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…
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…
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.
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…
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…
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…
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…
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…
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 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…
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…
Abstract Scanning electron microscopy studies have been carried out on gum and filled natural rubber vulcanizates to investigate the ridge formation in the abrasion of elastomers. The first step of the ridge formation is the occurrence of small particles on the smooth abrading surface by a process of microtearing. The…
It is shown by explicit calculation that there are 12 bulk elastic constants and 3 surface terms in the elastic energy of biaxial nematics.Received 29 December 1981DOI:https://doi.org/10.1103/PhysRevA.26.1783©1982 American Physical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-angle neutron scattering from elastomeric networks. Application to labeled chains containing several crosslinksRobert UllmanCite this: Macromolecules 1982, 15, 5, 1395–1402Publication Date (Print):September 1, 1982Publication History Published online1 May 2002Published…
Abstract The kinetics of the thermal regeneration of activated carbons used in the waste water treatment was analyzed on the basis of a model that the regeneration reaction consists of a set of many first‐order reactions each of which has different activation energy and frequency factor. The frequency factors were cor…
Experimental data on the longitudinal magnetostriction of two pure and one $p$-type bismuth single crystals are reported for fields up to 19 T at temperatures near 2 K. These data are consistent with a model based on the deformation potential concept used to compute the magnetostrictive strain components versus field,…
In the past, two factors have impeded the quantitative estimate of Fe-oxides in soils by X-ray diffraction. First, Fe-oxides are still quite often considered X-ray amorphous, although numerous results, e.g. a low ratio of oxalate- to dithionite-soluble Fe, have indicated the opposite. Second, even if crystalline, the…