Materials Literature
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We discuss the development of an original method preparing thermoluminescent dosimeters using magnesium borate and calcium sulfate materials activated with rare earths. This method is based upon the effect of sensitized thermoluminescent emission of basic TLD phosphors as well as on the method for producing these in s…
In concentrated solutions of sodium silicate with SiO 2:Na 2 O ratios ranging from 2:1 to 4:1, about 75% of the silica is present as extremely small particles which increase from 1 to 2 nm in diameter with increasing ratio. It is suggested that the ionized surface of the particles is covered with an absorbed monolayer…
Abstract The complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982 , 996. DOI: 10.1002/anie.198209960
Fe 2 P (space group P 2 m ) is a highly anisotropic, metallic ferromagnet with the spontaneous magnetization directed parallel to the c -axis. The ferromagnetic transition at T c = 217 K is of first order and accompanied by a sudden change in lattice parameters. In order to study the ferromagnetic transition we have m…
Navicula sect. Johnsonieae sensu Hustedt included Navicula scopulorum Bréb. which has been shown to have included two discrete species, one now transferred to Berkeleya Grev., B. scopulorum (Bréb.) E. J. Cox, while the other corresponded to Okedenia scopulorum sensu Mereschkowsky. This species is compared with other m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorus based additives for flame retardant polyester. 1. Low molecular weight additivesRobert W. StackmanCite this: Ind. Eng. Chem. Prod. Res. Dev. 1982, 21, 2, 328–331Publication Date (Print):June 1, 1982Publication History Published online1 May 2002Published inissue 1…
The gaseous degradation products of low density polyethylene exposed to corona discharges were investigated. Temperature and applied voltage were varied independently in order to determine the effect of each on the chemical processes involved in the degradation. Based upon statistical analysis of the results, temperat…
An investigation of the causes and mechanisms of severe exfoliation corrosion damage in aluminum pipe irrigation networks utilizing fresh water has been conducted, making use of electron microscopy and microanalysis techniques, together with chemical and electrochemical methods. Pipes were made of (6000) series alloys…
The hydrodynamics of biaxial nematics has been obtained in the presence of an external field $\stackrel{\ensuremath{\rightarrow}}{H}$. By working with the triad order parameter, we obtain results valid for arbitrary nonsingular textures. We also present the bending energy for biaxial nematics. Our derivation of the hy…
The relationship between polymerisation-depolymerisation reactions and the formation of colloids has been studied for silicate solutions lying in that area of the pH-concentration diagram commonly referred to as the instability region. Changes in both acidic and basic solutions have been followed by a variety of techn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper-assisted addition of 3(5)-methylpyrazole to acetaldehyde. Synthesis, structure, and magnetism of a unique tetranuclear copper(II) compound: bis[.mu.-[1-(1-ethanoyl)-5-methylpyrazolato-N2,O]]-tetrakis[.mu.-[3(5)-methylpyrazolato-N1,N2]]-bis(nitrato)tetracopper(II)Richa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome aspects of the electronic structures of a series of trimeric transition-metal cluster complexesAlbert B. Rives, Xiao Zeng You, and Richard F. FenskeCite this: Inorg. Chem. 1982, 21, 6, 2286–2294Publication Date (Print):June 1, 1982Publication History Published online1 M…
Critical review of the literature on iron(I) and iron(IV) porphyrins reveals many ambiguities in the assigned spin and oxidation states. The question of whether a redox reaction has occurred at the iron atom or at the porphyrin ring in highly reduced or highly oxidized complexes is not semantic and can usually be deci…
Some wholly aromatic polyamides derived from unsubstituted and chloro- and nitro-substituted diamines have been studied from the viewpoint of their thermal stability, thermo-oxidative stability, and thermal transitions. General relationships between thermal stability of a polymer and its chemical structure are describ…
The amplitude and phase of a wave scattered by an adsorbed layer can be deduced from the modifications of the Bragg peak of the powder by adsorption. The treatment of experimental data involves the interpretation of a function of the extra intensity detected and has the advantages of an integrated intensity method. Po…
Silica glass has not been fully characterized as a host material for glass lasers. To evaluate the intrinsic fluorescent characteristics of Nd-doped SiO 2 glass, a plasma torch CVD system was specially designed for the preparation of clear high purity glasses. Both of the observed fluorescences of Nd 3+ ( 4 F 3/2 – 4…
Abstract Model hard segments from MDI and different chain extenders have been studied by DSC. Among the studied α‐ω alkane diol‐type chain extenders, all giving crystalline hard segments, butane diol shows the highest melting temperature, while other types such as 1,4‐diaminobutane, 1,4‐benzene dimethanol, and 4,4′‐me…
The present compressed gas insulated transmission systems using SP6 are being operated well below the dielectric capability of the gas. Improvements in reliability and operation at higher stresses could be achieved in these transmission systems if the effect of particle contamination could be eliminated. Results from…
Indirect methods for introducing sulfonate groups into polyethylene, using the preirradiation technique, were studied. One of the methods involved graft polymerization of 2,3-epoxypropyl acrylate into polyethylene followed by sulfonation of the epoxy ring with bisulfite. The hydroxy sulfonate thus obtained was unstabl…
As a consequence of several technological developments, the speed and sensitivity of solution X-ray (and neutron) scattering studies have recently risen by factors which may be as large as 105; formal problems – like assessing the information content of the data and retrieving that information in structural terms – ha…