Search results for "model."
showing 10 items of 23664 documents
Extensions of the standard model scalar sector and constraints from ccolliders and cosmology
2013
In this thesis we study the Higgs sector of the Standard Model and compare it to the latest data from the LHC and Tevatron experiments. Then we consider two extensions of the Higgs sector. First we extend the Standard Model Higgs sector with one real SU(2) singlet and then we consider two-Higgs- doublet model and extend also it with one real singlet. In both extensions the singlet scalar is considered as a potential dark matter candidate. We find that the parameter space of the so called two-Higgs-doublet-inert-singlet model includes regions which could provide a dark matter candidate which constitutes significant amount of the total dark matter mass density.
Dark matter and baryogenesis in Higgs portal models
2016
This work focuses on two of the main issues in current understanding of particle physics described by the Standard Model. The Standard Model, despite of its success, is not complete. Existence of dark matter has been clearly verified, but its nature is unknown. Also, the baryon asymmetry in the Universe hints that the Standard Model has to be extended. In this thesis we study Higgs portal models which both contain dark matter candidates, and can provide for a successful production of the baryon asymmetry.
Shell-model computed cross sections for charged-current scattering of astrophysical neutrinos off 40Ar
2018
Charged-current (anti)neutrino- 40 Ar cross sections for astrophysical neutrinos have been calculated. The initial and final nuclear states were calculated using the nuclear shell model. The folded solar-neutrino scattering cross section was found to be 1.78 ( 23 ) × 10 − 42 cm 2 , which is higher than what the previous papers have reported. The contributions from the 1 − and 2 − multipoles were found to be significant at supernova-neutrino energies, confirming the random-phase approximation (RPA) result of a previous study. The effects of neutrino flavor conversions in dense stellar matter (matter oscillations) were found to enhance the neutrino-scattering cross sections significantly for …
Evaluating the Efficiency of Different Regression, Decision Tree, and Bayesian Machine Learning Algorithms in Spatial Piping Erosion Susceptibility U…
2020
Piping erosion is one form of water erosion that leads to significant changes in the landscape and environmental degradation. In the present study, we evaluated piping erosion modeling in the Zarandieh watershed of Markazi province in Iran based on random forest (RF), support vector machine (SVM), and Bayesian generalized linear models (Bayesian GLM) machine learning algorithms. For this goal, due to the importance of various geo-environmental and soil properties in the evolution and creation of piping erosion, 18 variables were considered for modeling the piping erosion susceptibility in the Zarandieh watershed. A total of 152 points of piping erosion were recognized in the study area that…
Modeļu izmantošana 4 - 5 gadus veciem bērniem priekšējo mēleņu fonētiski fonemātisko traucējumu novēršanai
2020
Diplomdarba tēma: Modeļu izmantošana 4 -5 gadus veciem bērniem priekšējo mēleņu fonētiski fonemātisko traucējumu novēršanai. Pētījuma mērķis ir teorētiski un praktiski izzināt priekšējo mēleņu izrunas korekcijas iespējas vingrinājumos un ar modeļu palīdzību. Teorētiskajā daļā ir izzināta un aprakstīta modeļu izmantošana koriģējoši attīstošajā darbībā bērniem ar fonētiski fonemātiskiem traucējumiem. Tajā atspoguļoti: •vidējā pirmskolas vecuma bērnu attīstības likumsakarības problēmas skatījumā; •priekšējo mēleņu izrunas traucējumu daudzveidība un izpausmes; •fonētiski fonemātisko traucējumu novēršanas darba posmi, izmantojot modelēšanu. Empīriskajā daļā ir veikts pedagoģiskais pētījums par l…
Avaluació de la eina Elluminate Live! en l'ensenyament a distància: un estudi pilot en la Universitat de València
2008
Evaluación de la plataforma Elluminate Live! en la enseñanza a distancia: un estudio piloto en la Universitat de València
Detección de nuevos marcadores asociados a daño por reperfusión y fibrosis en infarto de miocardio validados histopatológicamente mediante análisis m…
2022
La resonancia magnética cardiovascular (RMC) con realce tardío es la técnica de referencia para la evaluación no invasiva del daño cardíaco después de un infarto de miocardio (IM). Sin embargo, la interpretación de estas imágenes en términos de daño tisular es aún complicado y el uso de agentes de contraste en esta técnica está contraindicado en un amplio sector de la población con insuficiencia renal crónica. La microscopía de resonancia magnética (MRM) proporciona un nivel de detalle comparable al objetivo macroscópico de la microscopía óptica. Por ello, podría ser una herramienta muy útil en la interpretación de la imagen de RMC y en la identificación de nuevos marcadores de imagen de re…
La parola e la guerra. Rappresentazioni letterarie del bellum civile in Lucano
2005
All'interno del Bellum civile di Lucano, dove campeggia ossessivamente la figurazione di un passato glorioso consumato dalla durezza dello scontro civile, con un singolare gioco ricorsivo il poeta prefigura le immagini di Cesare e Pompeo in quelle di Mario e Silla. Lo scontro tra i fraterna arma, che grava sull'atto stesso di fondazione della città, sembra ripetersi nelle fasi e nei personaggi con un'impressionante fissità che apre spiragli inquietanti sui comportamenti dei leaders politici tra una generazione e l'altra. Attraverso una sistematica indagine linguistica delle forme di designazione di Mario e Silla in rapporto a quelle impiegate per caratterizzare Cesare e Pompeo, emerge la co…
Reaction Mechanism of an Intramolecular Oxime Transfer Reaction: A Computational Study
2014
Density functional theory (PBE0/def2-TZVPP) calculations in conjunction with a polarizable continuum model were used to assess the mechanism of the intramolecular oxime transfer reaction that leads to the formation of isoxazolines. Different diastereomers of the intermediates as well as different oximes (formaldehyde and acetone oxime) were considered. The computed reaction profile predicts the water-addition and -expulsion steps as the highest barriers along the pathway, a conclusion that is in line with the experimental evidence obtained previously for these reactions. peerReviewed
Deep and Proximate Determinants of the World Income Distribution
2019
This paper studies the deep and proximate determinants of the evolution of the cross-country distribution of GDP per worker in the period 1960–2008 by a novel method based on an information criterion. We find that countries of our sample follow three distinctive growth regimes identified by two deep determinants, namely life expectancy at birth in 1960 and the share of Catholics in 1965, and that each regime is characterized by non-linearities. Growth regimes appear to be the main cause of the increased inequality and polarization, while technological catch-up, proxied by the initial level of GDP per worker, acts in the opposite direction. Finally, human capital marginally reduces polarizat…