Search results for "diagramma"
showing 10 items of 40 documents
Introduction : formes de l'iconicité
2014
International audience; L'emploi du terme "eikon" pour désigner une forme linguistique fonctionnant comme une image est aussi ancien que la tradition linguistico-grammaticale de l'Occident. Il figure en effet pour la première fois dans le Cratyle de Platon (439a), point de départ de cette tradition. Pour Platon, qui ne distingue pas encore entre signifiant et signifié, il est raisonnable d'affirmer que le nom, dans son ensemble, et jusqu'à ses éléments phonologiques, opère comme une image de la chose signifiée, ce qui constitue du reste une bonne raison pour s'en méfier et préférer la connaissance directe des choses à celle de leurs représentations. La reprise du terme "icon" dans la pensée…
Zvaigžņotā Debess: 2007/08, Ziema
2007
Latvijas Zinātnes padome, Latvijas Universitāte
Zvaigžņotā Debess: 2008/09, Ziema
2008
Latvijas Zinātņu akadēmija, Latvijas Universitāte
Zvaigžņotā Debess: 2006/07, Ziema
2006
Latvijas Zinātnes padome, Latvijas Universitāte
Zvaigžņotā Debess: 2013/14, Ziema (222)
2013
Latvijas Universitāte
Zvaigžņotā Debess: 2004/05, Ziema
2004
Contents: Ņ.Ozoliņa. Earthquakes in Latvia ; I.Daube. Space Craft “Ranger-7” ; M. Gailis. Moon Investigation in Riga ; J.Tambergs. Problems of Dialogue between Quantum Mechanics and Theology (concluded) ; Z Alksne, A.Alksnis. Ultra-Cool Dwarf Pair Weighed ; A.Balklavs. Successful Hunt of Protostars ; A.Balklavs. Silhouette of a Black Hole ; A.Balklavs. A Distant Giant Quasar ; A.Balklavs. Cosmic Objects in Captivating Photos – 3 ; J.Freimanis. Extragalactic Planetary Nebulae ; J.Jaunbergs. Cassini Enters the Saturnian System ; D.Krieviņš. Space Launchers of Early XXI Century. The Commonwealth of Independent States (CIS) ; J.Bārzdiņš. Professor Rusins-Martins Freivalds on the Path of Science…
Dažādu nitrobenzoskābju atvasinājumu un to izomēru cieto šķīdumu veidošanās pētījumi
2020
Dažādu nitrobenzoskābju atvasinājumu un to izomēru cieto šķīdumu veidošanās pētījumi. Saršūns K., darba vadītājs Dr. Chem. Bērziņš A., zinātniskais konsultants MSc. Chem. Kons A. Maģistra darbs, 92 lappuses, 51 attēls, 29 tabulas, 17 pielikumi, 112 literatūras avoti. Latviešu valodā. Maģistra darba ietvaros ir apkopota informācija par modeļvielām – 2-aizvietotajām 4-nitrobenzoskābēm, 2-aizvietotajām 5-nitrobenzoskābēm, 4-aizvietotajām 3-nitrobenzoskābēm, kā arī 5-aizvietotajām 2-nitrobenzoskābēm –, vispārīgu vielu raksturojumu, cietvielu kristāliskām formām, kristālu uzbūvi raksturojošiem parametriem, cieto šķīdumu raksturojumu, par rentgendifraktometriju, diferenciālo skenējošo kalorimetri…
Theories relating baryon asymmetry and dark matter
2014
The nature of dark matter and the origin of the baryon asymmetry are two of the deepest mysteries of modern particle physics. In the absence of hints regarding a possible solution to these mysteries, many approaches have been developed to tackle them simultaneously leading to very diverse and rich models. We give a short review where we describe the general features of some of these models and an overview on the general problem. We also propose a diagrammatic notation to label the different models.
Diagrammatic expansion for positive spectral functions beyond GW : Application to vertex corrections in the electron gas
2014
We present a diagrammatic approach to construct self-energy approximations within many-body perturbation theory with positive spectral properties. The method cures the problem of negative spectral functions which arises from a straightforward inclusion of vertex diagrams beyond the GW approximation. Our approach consists of a two-steps procedure: we first express the approximate many-body self-energy as a product of half-diagrams and then identify the minimal number of half-diagrams to add in order to form a perfect square. The resulting self-energy is an unconventional sum of self-energy diagrams in which the internal lines of half a diagram are time-ordered Green's functions whereas those…
Diagrammatic approach to quantum search
2014
We introduce a simple diagrammatic approach for estimating how a randomly walking quantum particle searches on a graph in continuous-time, which involves sketching small weighted graphs with self-loops and considering degenerate perturbation theory's effects on them. Using this method, we give the first example of degenerate perturbation theory solving search on a graph whose evolution occurs in a subspace whose dimension grows with $N$.