Search results for " theory."
showing 9 items of 22859 documents
Spatial econometrics (1, Spatial autocorrelation)
2000
Spatial econometric methods aim at taking into account the two special characteristics of spatial data: spatial autocorrelation, which is the lack of independence between geographical observations, and spatial heterogeneity, which is related to the differentiation of variables and behaviors in space. These techniques have been mostly developed the last ten years and are more often applied in empirical studies with geographical data.The aim of this article is to present the way spatial autocorrelation and spatial heterogeneity can be incorporated in regression relationships and to present the estimation and inference procedures adapted to the models incorporating these two effects. This arti…
Socializācijas teorijas pieeja pieauguša japāņu kā otrās valodas apguvēja gadījuma izpētei
2018
Šis darbs savieno teorētiskās pieejas valodu apguvē, par piemēru izmantojot pieaugušu valodas apguvēju Japānā, lai analizētu to, kā sociālā mijiedarbība ietekmē valodas apguves procesu. Šajā darbā tiek apspriestas trīs valodas apguves teorijas, kurās tiek likts uzsvars uz sociālo aspektu valodas apguvē. Vigotska sociokultūras teorija apskata valodas apguvi caur sarunām, kā arī sadarbojoties ar zinošākiem vienaudžiem. Oksa un Šīfelina “Valodas socializācijas” (Language Socialization) teorija apskata kultūras iesaisti, kas nepieciešama valodas apguvei. Visbeidzot tiek apskatīts Vengera un Leiva koncepts “Mācību kopienas” (Communities of Practice), lai izprastu pieejamības un piedalīšanās nozī…
Kārļa Egles un Rūdolfa Egles arhīvu literārie materiāli : Mihaila Ļermontova recepcija latviešu literatūrā
2018
On the Amount of Nonconstructivity in Learning Recursive Functions
2011
Nonconstructive proofs are a powerful mechanism in mathematics. Furthermore, nonconstructive computations by various types of machines and automata have been considered by e.g., Karp and Lipton [17] and Freivalds [11]. They allow to regard more complicated algorithms from the viewpoint of much more primitive computational devices. The amount of nonconstructivity is a quantitative characterization of the distance between types of computational devices with respect to solving a specific problem. In the present paper, the amount of nonconstructivity in learning of recursive functions is studied. Different learning types are compared with respect to the amount of nonconstructivity needed to lea…
Search for the Decay of the Higgs Boson to Charm Quarks with the ATLAS Experiment
2018
A direct search for the standard model Higgs boson decaying to a pair of charm quarks is presented. Associated production of the Higgs and Z bosons, in the decay mode ZH→ℓ+ℓ−c¯c is studied. A data set with an integrated luminosity of 36.1 fb−1 of pp collisions at √s=13TeV recorded by the ATLAS experiment at the LHC is used. The H→c¯c signature is identified using charm-tagging algorithms. The observed (expected) upper limit on σ(pp→ZH)×B(H→c¯c) is 2.7 (3.9+2.1−1.1) pb at the 95% confidence level for a Higgs boson mass of 125 GeV, while the standard model value is 26 fb.
Dynamics of a harmonic oscillator coupled with a Glauber amplifier
2020
A system of a quantum harmonic oscillator bi-linearly coupled with a Glauber amplifier is analysed considering a time-dependent Hamiltonian model. The Hilbert space of this system may be exactly subdivided into invariant finite dimensional subspaces. Resorting to the Jordan-Schwinger map, the dynamical problem within each invariant subspace may be traced back to an effective SU(2) Hamiltonian model expressed in terms of spin variables only. This circumstance allows to analytically solve the dynamical problem and thus to study the exact dynamics of the oscillator-amplifier system under specific time-dependent scenarios. Peculiar physical effects are brought to light by comparing the dynamics…
On the ‘expanded local mode’ approach applied to the methane molecule: isotopic substitutions CH3D ←CH4 and CHD3 ←CH4
2014
Operator perturbation theory and the symmetry properties of the axially symmetric XYZ3 (C3v) type molecules are used for the determination of the spectroscopic parameters in the form of functions of structural parameters and parameters of the intramolecular potential function. Several relations between sets of spectroscopic parameters of these molecules are obtained. The ‘expanded local mode’ model and the general isotopic substitution theory are used to estimate the relations between spectroscopic parameters of CH3D and CHD3, on one hand, and with the Td symmetric isotopic species, CH4, on the other hand. Test calculations with the isotopic relations show that even without including prior …
Three three-letter words in three recent novels in three different languages: God, sex and joy
2017
In this article, the authors propose to analyse the ways in which religion and sexuality are related to one another in three recent novels: (1) Fransi Phillips�s Die donker god (2007), (2) Inga �olude�s Santa Biblia (2013) and (3) Michel Houellebecq�s Soumission [English translation: Submission] (2015). In each case, the novels are briefly placed within their respective literary cultures (Afrikaans, Latvian and French) in order to offer a contextually sensitive analysis. After each of the novels has been discussed related to the three related topoi of God, sex and joy, some comparative remarks are offered in conclusion.Intradisciplinary and/or interdisciplinary implications: In this contrib…