Materials Literature
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High‐temperature ionic conductivity of zirconia–calcia (ZrO 2 –CaO), zirconia–yttria (ZrO 2 Y 2 O 3 ), and zirconia–rareearth‐oxide (ZrO 2 RE 2 O 3 ) solid solutions was measured at temperatures of 1000°–1600°C. The emf polarization method and a thermodynamic emf method using a new reference system (aluminum melt coex…
Abstract Feinglosite, the zinc analogue of arsenbrackebuschite, was found lining a cavity in a sample of massive chalcocite from Tsumeb, Namibia. In this cavity it is associated with wulfenite, anglesite and goethite. The mean of seven electron-microprobe analyses (wt.%) is: PbO 61.4, ZnO 7.3, FeO 1.8, As 2 O 5 22.1,…
The solid state structure of dilithium tetraphenylporphyrin bis(etherate) has been determined by X-ray crystallography. The structure shows the lithium atoms are displaced out of the plane of the porphyrin, each coordinated in a square pyramidal fashion to the four nitrogen atoms in addition to a molecule of diethyl e…
In this paper the origin of nonlinearities of the K[B5O6(OH)4] · 2 H2O (KB5) crystal has been investigated from a comprehensive view-point by using the bond-valence theory of complex crystals. The results of the calculation (d31 = —1.18 × 10—10 esu, d32 = 0.20 × 10—10 esu, and d33 = —1.03 × 10—9 esu) are in good agree…
High conversion of wastewater into biomass of photosynthetic bacteria was investigated. This biomass is possibly utilized as feed for fish or extraction source of PHA (polyhydroxyalkanoate). As a fundamental investigation, batch experiments were carried out using purple nonsulfur bacteria Rhodobacter sphaeroides to de…
Comprehensive acoustic measurements on bouncing particles in a gas insulated substation (GIS) have been carried out. The objective is to find parameters that both are available from external acoustic measurements and usable for assessing whether a particle has the potential to cause an insulation breakdown. The elapse…
Structures of mixed crystals of the isomorphous salts NaClO 3 and NaBrO 3 (sodium chlorate and sodium bromate, respectively) were reinvestigated by X-ray diffraction. Contrary to previous reports, NaCl x Br 1− x O 3 is not cubic. Data from adjacent {100} growth sectors of crystals of varying composition were refined i…
A collection of data documenting the stress corrosion cracking (SCC) behavior of austenitic stainless steels (SS) in high-temperature aqueous environments was investigated using empirical learning techniques. Computer-based empirical learning systems based on classical and nonparametric statistics, connectionist model…
The structure and dynamics of silver ion conducting AgI−Ag 2 MoO 4 glasses have been simulated by molecular dynamics simulation over a wide range of compositions. Formation of silver iodide like aggregates have been identified only in the AgI rich glasses. Increase in silver ion conductivity with an increase in AgI co…
A mathematical model for the changes in molecular weight distribution that occur when free-radical initiator is added to a blend of linear low-density polyethylene and polypropylene during extrusion was developed. Experimental verification employed a size-exclusion chromatograph equipped with both differential refract…
Creaming behavior of oil-in-water emulsions stabilized by kaolinite clays was studied. The clays were treated with asphaltenes resulting in clays having different contact angles. It was found that the emulsion creaming velocity decreased and that the volume of the creamed emulsions increased with increasing clay conce…
Abstract Volatile products present in poly(vinyl chloride), PVC, after outdoor weathering have been compared with volatiles from laboratory, UV exposed PVC surfaces. Compounds both present in the photo‐degraded polymer surface layer and directly emitted from the polymer were measured in the laboratory experiments. The…
The efficient conversion of light energy into chemical energy is essential if solar energy is to be utilized successfully. The mechanisms of photosynthesis in green plants are used as guiding principles to propose different types of electron and proton transporting systems, for example, a chemical system based on poly…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFacile and Remarkably Selective Substitution Reactions Involving Framework Silicon Atoms in Silsesquioxane FrameworksFrank J. Feher, Shawn H. Phillips, and Joseph W. ZillerView Author Information Department of Chemistry, University of California Irvine, California 9269…
Zirconia‐based ceramics are considered as support materials for superconducting magnets, and the relationship between composition and mechanical properties at cryogenic temperature is reported. Ce‐TZP materials with CeO 2 content between 14.5 and 16.5 mol% can be made with high strength (600 MPa) and high toughness (1…
Surface enhanced Raman spectroscopy was used to study species present on carbon steel in CO 2 and N 2 saturated brines at 24 and 65°C. In the presence of CO 2 , a surface carbonate species, characterized by a peak at 1078 cm − 1 , was observed on the cathodically polarized steel surface. In CO 2 ‐saturated solutions,…
Stainless steel couplings in the main cooling water pipes of HVDC thyristor valves have been in use since 1983, with overall satisfactory behavior. However, some water leakage due to corrosion below the sealing O-rings of the couplings was observed during 1992. An extensive investigation and follow-up worldwide showed…
This paper deals with the hydrothermal modification of the physicochemical properties of complex mineral sorbents and catalysts. The hydrothermal modification of alumina, magnesia, ferric oxide and zirconia/silica hydro- and xero-gels as well as other complex adsorbents obtained by the coprecipitation and mechanical s…
Two aliphatic series of polyimides having well-defined structures with inherent viscosities of 0.4−2.7 dL g -1 were readily synthesized by the solid-state thermal polycondensation under high pressure of the salt monomers composed of aliphatic diamines having 6−12 methylene units and both pyromellitic acid (PMA) and bi…
The relationship between coatings, cathodic protection (CP), and external corrosion of underground pipelines is described. Historically, this problem has been addressed by focusing on the corrosion and CP processes associated with holidays, e.g., coating disbondment and CP current flow within the disbonded region. The…