Search results for "Deriva"
showing 10 items of 1423 documents
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…
Triazolopyridines 22.1 Description of new 7,9-di(2-pyridyl)[1,2,3]triazolo[5',1':6,1]pyrido[3,2-d]pyrimidines
2002
The new heteroaromatic compounds, 7,9-di(2-pyridyl)(1,2,3)triazolo(5',1':6,1)pyrido(3,2-d) pyrimidines 11a-c, were synthesized in two steps from readily available triazolopyridines 1a-c. Regioselective lithiation of 1a-c followed by treatment with 2-cyanopyridine gave a mixture of compounds 5a-c, and 11a-c in moderate to low yields, together with gums. Similar reactions with the triazolopyridine 1d gave as the only identified compound the triazolopyridine derivative 5d.
Resonance in Interacting Induced-Dipole Polarizing Force Fields: Application to Force-Field Derivatives
2009
The Silberstein model of the molecular polarizability of diatomic molecules, generalized by Applequist et al. for polyatomic molecules, is analyzed. The atoms are regarded as isotropically polarizable points located at their nuclei, interacting via the fields of their induced dipoles. The use of additive values for atom polarizabilities gives poor results, in some cases leading to artificial predictions of absorption bands. The molecular polarizability of methane and its derivative are computed. The agreement with experimental mean molecular polarizabilities is within 1–5%. A hypothesis is indispensable for a suitable representation of polarizability derivative.
Temperature effects explain continental scale distribution of cyanobacterial toxins
2018
Insight into how environmental change determines the production and distribution of cyanobacterial toxins is necessary for risk assessment. Management guidelines currently focus on hepatotoxins (microcystins). Increasing attention is given to other classes, such as neurotoxins (e.g., anatoxin-a) and cytotoxins (e.g., cylindrospermopsin) due to their potency. Most studies examine the relationship between individual toxin variants and environmental factors, such as nutrients, temperature and light. In summer 2015, we collected samples across Europe to investigate the effect of nutrient and temperature gradients on the variability of toxin production at a continental scale. Direct and indirect…
The Syllogistic with Unity
2011
We extend the language of the classical syllogisms with the sentence-forms “At most 1 p is a q” and “More than 1 p is a q”. We show that the resulting logic does not admit a finite set of syllogism-like rules whose associated derivation relation is sound and complete, even when reductio ad absurdum is allowed.
Dynamics of morphological processing in pre-school children with and without familial risk for dyslexia
2020
Difficulties in phonological processing and speech perception are associated with developmental dyslexia, but there is considerable diversity across people with developmental dyslexia (e.g., dyslexics with and without phonological difficulties). Phonological and morphological awareness are both known to play an important role in reading acquisition. Problems in morpho-phonological information processing could arguably be associated with developmental dyslexia, especially for Finnish, which is a rich morphologically language. We used MEG to study the connection between morpho-phonology in the Finnish language and familial risk for developmental dyslexia. We measured event-related fields (ERF…
Feromagnētiskas nanodaļiņas un to pielietojums mīkstu materiālu (dihidropiridīna tipa lipīdu organiski savienojumi, polimēri) funkcionalizācijai
2014
Elektroniskā versija nesatur pielikumus
Visuaalinen tangentti lukion pitkässä matematiikassa
2017
Opinnäytetyössä selvitellään lukion pitkän matematiikan opiskelijoiden käsityksiä visuaalisesta tangenttisuorasta (lyh. tangentista). Työ sisältää tietokoosteen tutkielman aihepiirin visuaalisesta tangentista. Lukio-opiskelijoiden käsityksiä tangentista esitellään Tallin 1980-luvun tietokoneavusteisesta opetuskokeilusta ja Bizan 2000-luvun tutkimuksesta. Empiirisessä tutkimuksessa tutkittiin lukion pitkän matematiikan oppikirjasarjan visuaalista tangenttia. Ihmiset ymmärtävät aistein havainnoitavat kohteet pääosin intuition avulla, kun taasen matemaattiset käsitteet voidaan ymmärtää aksioomien, määritelmien ja lauseiden pohjalta. Kuitenkin Bizan laaja tutkimus osoittaa, että lukio-opiskelij…
Geometric Aspects of Thermodynamics
2016
This chapter deals with mathematical aspects of thermodynamics most of which will be seen to be primarily of geometrical nature. Starting with a short excursion to differentiable manifolds we summarize the properties of functions, of vector fields and of one-forms on thermodynamic manifolds. This summary centers on exterior forms over Euclidean spaces and the corresponding differential calculus. In particular, one-forms provide useful tools for the analysis of thermodynamics. A theorem by Caratheodory is developed which is closely related to the second law of thermodynamics. The chapter closes with a discussion of systems which depend on two variables and for which there is an interesting a…