Search results for "Structural type"
showing 3 items of 3 documents
A novel oxovanadate structural type – Synthesis, single crystal structure and magnetic properties of a mixed-valence polyoxovanadate formed by {V17O4…
2007
Abstract A novel polyoxovanadate structural type, with an average nuclearity of V16, formed by a mixture of two different polyoxovananadates: {V15O36(Cl)} and{V17O40(Cl)} has been synthesized and characterized. The title compound, formulated as [Ni(phen)3]2{[V15O36(Cl)]0.5[V17O40(Cl)]0.5} · H2O (1) (phen = 1,10′-phenanthroline), presents two different polyoxovanadate architectures: {V15O36(Cl)} and {V17O40(Cl)}, with the last one representing a new framework type in polyoxovanadate chemistry. Here, we present the synthesis of this novel polyoxovanadate under hydrothermal conditions and its characterization by IR and XPS spectroscopies, elemental and thermogravimetric analysis, redox titrati…
Die Wurzelsysteme der endemischen Echium ‐Arten auf Tenerife (Kanarische Inseln) und ihre Beziehungen zum Wuchsort
1999
Die Wurzelsysteme der tenerfenischen Echium-Arten entwickeln sich recht uneinheitlich, immer aber gemas den ortlichen Gegebenheiten wie Bodenstruktur, Tiefgrundigkeit, Wasserfuhrung und entsprechend dem artspezifischen Bauplan. Die meisten Arten sind weder ausgepragt flach- noch tiefwurzelnd. Sie besitzen aber in der Mehrzahl eine Hauptwurzel, die nur dort pfahlartig in die Tiefe wachst, wo der Untergrund es zulast. Die Existenz feuchterer „Taschen”, nach denen sich das Wurzelwachstum ausrichtet, sind die wichtigste Wasserquelle fur die Mehrzahl der Echium-Arten. Sie bewirken eine betrachtliche Variabilitat ihrer Wurzelsysteme. Eine gunstige Wasserversorgung bieten auch Felsspalten und -klu…
Seismic Behavior of Lisbon Mixed Masonry-RC Buildings With Historical Value: A Contribution for the Practical Assessment
2018
The fact that linear analysis is still the most used procedure in the design engineering offices, studies which addresses issues associated to the estimation of the structural behavior factor values are relevant. In this study, the behavior factor of a particular type of mixed masonry-reinforced concrete buildings in Lisbon is estimated. The typology chosen in this study represents 30% of building stock in Lisbon; these buildings were built between 1930 and 1960 and thus were designed without considering the seismic-design requirements proposed in current codes. The evaluation of the behavior factors was based on the use of nonlinear static analyses, performed in the form of the sensitivity…