Search results for " Deriva"
showing 10 items of 718 documents
Evolutionary game theory of continuous traits from a causal perspective
2023
Modern evolutionary game theory typically deals with the evolution of continuous, quantitative traits under weak selection, allowing the incorporation of rich biological detail and complicated nonlinear interactions. While these models are commonly used to find candidates for evolutionary endpoints and to approximate evolutionary trajectories, a less appreciated property is their potential to expose and clarify the causal structure of evolutionary processes. The mathematical step of differentiation breaks a nonlinear model into additive components which are more intuitive to interpret, and when combined with a proper causal hypothesis, partial derivatives in such models have a causal meanin…
El problema del acortamiento de curvas asociado a una densidad
2016
A lo largo de la presente Tesis, se estudia el flujo por la curvatura media asociado a una densidad (FCMpsi) de una hipersuperficie, en una variedad riemanniana con densidad. Los principales resultados se obtienen para el caso particular en el que la dimensión de la variedad ambiente es dos y las subvariedades son curvas. A dicho problema, se le llamará problema del acortamiento de curvas asociado a una densidad (PACpsi). En el capítulo uno, se presentan los conceptos básicos para desarrollar y comprender el trabajo de la Tesis. Se da la definición del problema a abordar, se introducen las herramientas necesarias para su estudio y se calculan las fórmulas de variación de las cantidades geom…
Investigation of photoluminescence and amplified spontaneous emission properties of cyanoacetic acid derivative (KTB) in PVK amorphous thin films
2018
This work was supported by European Regional Development Fund within the Project No. 1.1.1.1/16/A/046 and A.Riekstins SIA “Mikrotīkls” donation, administered by University of Latvia Foundation.
Self-Assembled Molecular Rafts at Liquid|Liquid Interfaces for Four-Electron Oxygen Reduction
2011
The self-assembly of the oppositely charged water-soluble porphyrins, cobalt tetramethylpyridinium porphyrin (CoTMPyP(4+)) and cobalt tetrasulphonatophenyl porphyrin (CoTPPS(4-)), at the interface with an organic solvent to form molecular "rafts", provides an excellent catalyst to perform the interfacial four-electron reduction of oxygen by lipophilic electron donors such as tetrathiafulvalene (TTF). The catalytic activity and selectivity of the self-assembled catalyst toward the four-electron pathway was found to be as good as that of the Pacman type cofacial cobalt porphyrins. The assembly has been characterized by UV-visible spectroscopy, Surface Second Harmonic Generation, and Scanning …
ChemInform Abstract: Synthesis and anti-Staphylococcal Activity of New Halogenated Pyrroles Related to Pyrrolomycins F.
2008
The chemical synthesis of new halogenated pyrroles related to pyrrolomycins F is described and the anti-staphylococcal activity compared. The replacement of 4′-bromo atom of parent compounds with two chloro atoms at 3′ and 5′ position increase the antibacterial activity against a reference strain of S. aureus.
Crystal structure of hydrocortisone 17-butyrate
2014
In the title compound, C25H36O6, the two central cyclohexane rings exhibit a chair conformation. The terminal cyclohexene and cyclopentane rings are in half-chair and envelope conformations (with the C atom bearing the methyl substituent as the flap), respectively. The methyl group of the butyrate chain is disordered over two orientations, with a refined occupancy ratio of 0.742 (6):0.258 (6). Intramolecular O—H...O and C—H...O hydrogen bonds are observed. In the crystal, molecules are linked by O—H...O hydrogen bonds into chains running parallel to theaaxis.
LEGAL CONSIDERATIONS REGARDING THE INTRODUCTION AND IMPLEMENT OF THE PROPOSED `FINANCIAL TRANSACTION TAX` ON PENSION FUNDS. IMPACT ON TRANSACTION COS…
2012
In economies in which pension obligations are substantial, it is important that there is a high degree of trust in the financial reporting of pensions by employers and by pension plans. The objective of this paper is to assess legal considerations regarding the introduction and implement of financial transaction tax mechanisms in private pension system. In line with this objective, an understanding of causes, implications, solutions for pensions is essential to being able to efficiently and effectively create a secure fiscal environment.
Il latte e i suoi derivati: un alimento senza limiti di età
2009
Sobre el concepte de derivació fonològica: alguns fenòmens vocàlics en basc i en català
1995
In the standard generative model, phonological rules are strictly ordered, potentially giving rise to complicated derivations with a large number of intermediate representations. In such a model, the order in which the rules apply is as important as the correct formulation of the rules. There are obvious conceptual problems with this theoretical framework, and in recent years several proposals which do away with rule ordering have been put forward. In this paper, we examine a number of vocalic alternations in Basque and Valencian (Southern Catalan), which in a standard generative analysis require a complex rule ordering. Adapting Lakoff' s model we show that, in every case, we can have a si…
«(Des)obediències de la reducció vocàlica en el català de Mallorca»
2013
En el català de Mallorca, el procés de reducció vocàlica de les vocals mitjanes de la sèrie anterior a e neutra en posició àtona no opera (o subaplica) en determinades circumstàncies: (a) en formes derivades productives amb una vocal àtona situada a la síl·laba esquerra o inicial del radical i alternant amb e tancada o e oberta en el radical de la forma primitiva; (b) en formes verbals amb una vocal àtona situada a la síl·laba esquerra o inicial del radical i alternant amb e tancada en una altra forma verbal del mateix paradigma flexiu; (c) en manlleus i paraules apreses amb una vocal àtona e situada, també, a la síl·laba esquerra o inicial del radical i generalment precedida d’una consonan…