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21.
Super-geometrodynamics
Mirjam Cvetič, G. W. Gibbons, Christopher N. Pope, 2015, izvirni znanstveni članek

Opis: We present explicit solutions of the time-symmetric initial value constraints, expressed in terms of freely specifiable harmonic functions for examples of supergravity theories, which emerge as effective theories of compactified string theory. These results are a prerequisite for the study of the time-evolution of topologically non-trivial initial data for supergravity theories, thus generalising the "Geometrodynamics" program of Einstein-Maxwell theory to that of supergravity theories. Specifically, we focus on examples of multiple electric Maxwell and scalar fields, and analyse the initial data problem for the general Einstein-Maxwell-Dilaton theory both with one and two Maxwell fields, and the STU model. The solutions are given in terms of up to eight arbitrary harmonic functions in the STU model. As a by-product, in order compare our results with known static solutions, the metric in isotropic coordinates and all the sources of the non-extremal black holes are expressed entirely in terms of harmonic functions. We also comment on generalizations to time-nonsymmetric initial data and their relation to cosmological solutions of gauged so-called fake supergravities with positive cosmological constant.
Ključne besede: black holes, supergravity, string theory, conformal field models, string duality
Objavljeno: 14.06.2017; Ogledov: 23; Prenosov: 0
.pdf Polno besedilo (581,40 KB)

22.
Entanglement entropy of subtracted geometry black holes
Mirjam Cvetič, Zain H. Saleem, Alejandro Satz, 2015, polemika, diskusijski prispevek, komentar

Opis: We compute the entanglement entropy of minimally coupled scalar fields on subtracted geometry black hole backgrounds, focusing on the logarithmic corrections. We notice that matching between the entanglement entropy of original black holes and their subtracted counterparts is only at the order of the area term. The logarithmic correction term is not only different but also, in general, changes sign in the subtracted case. We apply Harrison transformations to the original black holes and find out the choice of the Harrison parameters for which the logarithmic corrections vanish.
Ključne besede: black holes, string theory
Objavljeno: 14.06.2017; Ogledov: 24; Prenosov: 1
.pdf Polno besedilo (378,41 KB)
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23.
General U(1) x U(1) F-theory compactifications and beyond: geometry of unHiggsings and novel matter structure
Mirjam Cvetič, Denis Klevers, Hernan Piragua, Washington Taylor, 2015, izvirni znanstveni članek

Opis: We construct the general form of an F-theory compactification with two U(1) factors based on a general elliptically fibered Calabi-Yau manifold with Mordell-Weil group of rank two. This construction produces broad classes of models with diverse matter spectra, including many that are not realized in earlier F-theory constructions with U(1) x U(1) gauge symmetry. Generic U(1) x U(1) models can be related to a Higgsed non-Abelian model with gauge group SU(2) x SU(2) x SU(3), SU(2)(3) x SU(3), or a subgroup thereof. The nonlocal horizontal divisors of the Mordell-Weil group are replaced with local vertical divisors associated with the Cartan generators of non-Abelian gauge groups from Kodaira singularities. We give a global resolution of codimension two singularities of the Abelian model; we identify the full anomaly free matter content, and match it to the unHiggsed non-Abelian model. The non-Abelian Weierstrass model exhibits a new algebraic description of the singularities in the fibration that results in the first explicit construction of matter in the symmetric representation of SU(3). This matter is realized on double point singularities of the discriminant locus. The construction suggests a generalization to U(1)(k) factors with k > 2, which can be studied by Higgsing theories with larger non-Abelian gauge groups.
Ključne besede: F-theory, differential geometry, algebraic geometry, gauge symmetry
Objavljeno: 14.06.2017; Ogledov: 29; Prenosov: 0
.pdf Polno besedilo (1,36 MB)

24.
Application of Mawhin’s coincidence degree and matrix spectral theory to a delayed system
Yong-Hui Xia, Xiang Gu, Patricia Wong J. Y., Syed Abbas, 2012, izvirni znanstveni članek

Opis: This paper gives an application of Mawhin’s coincidence degree and matrix spectral theory to a predator-prey model with M-predators and N-preys. The method is different from that used in the previous work. Some new sufficient conditions are obtained for the existence and global asymptotic stability of the periodic solution. The existence and stability conditions are given in terms of spectral radius of explicit matrices which are much different from the conditions given by the algebraic inequalities. Finally, an example is given to show the feasibility of our results.
Ključne besede: coincidence degree, Jean Mawhin, predator-prey model, spectral theory
Objavljeno: 12.06.2017; Ogledov: 77; Prenosov: 0
.pdf Polno besedilo (2,05 MB)

25.
Akutni hepatitis nepojasnjene etiologije
Pavel Skok, Andrej Verk, 1995, strokovni članek

Ključne besede: hepatitis, akutni hepatitis, etiologija
Objavljeno: 30.12.2015; Ogledov: 163; Prenosov: 8
URL Polno besedilo (0,00 KB)

26.
Obolenja prebavil in nujna stanja v obdobju novorojenčka
Silva Burja, Dušanka Mičetić-Turk, 2012, pregledni znanstveni članek

Opis: V skupini novorojenčkov z običajnimi prebavnimi težavami je tudi pomembna skupina otrok z zelo resnimi obolenji prebavil s kirurškimi diagnozami. Prispevek je osredotočen na tiste, ki jih najpogosteje srečamo v praksi in razpravlja o nekaterih potencialno ogrožajočih prirojenih anomalijah in drugih obolenjih prebavil, ki se pojavijo že v obdobju novorojenčka. Naš namen je bil poglobiti razpravo o tej problematiki s poudarki na pomembnosti hitrega in pravilnega ukrepanja v vsakodnevni praksi.
Ključne besede: Dojenček, novorojenček, Emergencies, Gastrointestinal Diseases, Gastrointestinalne bolezni, Infant, Newborn, novorojenčki, Nujna stanja, prebavila
Objavljeno: 30.12.2015; Ogledov: 248; Prenosov: 8
URL Polno besedilo (0,00 KB)

27.
Izvestje Muzejskega društva v Mariboru
1932, izvirni znanstveni članek

Objavljeno: 30.12.2015; Ogledov: 163; Prenosov: 5
URL Polno besedilo (0,00 KB)

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29.
Glasba in film v obliki novih medijev na knjižni polici
Mitja Reichenberg, 1995, strokovni članek

Opis: Specialnost se je v današnjem času izkazala tako v znanstvenih, gospodarskih kot tudi umetniških disciplinah kot pomemben preskok iz nekdanje prakse splošnega vedenja v ozko usmerjeno in definirano poznavanje samo enega dela nekega področja. Knjižnica, nekdaj "mini mundus" (svet v malem), prestopa meje knjižnega fonda, ki je bil do nedavnega edini hranitelj informacij ter stopa v multimedialnost tako pri hranjenju, dajanju in prenosu informacij. Glasba in film prihajata v ta knjižnični prostor kot nova in sveža polnopravna ćlana tudi izven oblike knjige; s tem pa odpirata nove naloge in možnosti pred bibliotekarsko stroko in seveda pred uporabnikom novih medijskihdobrin - ponovno v specialističnem duhu razvoja teoretične in praktične zasnove ene in druge doktrine.
Ključne besede: knjižnice, specialne zbirke, glasba, filmi, video, avdiovizualno gradivo, Maribor
Objavljeno: 30.12.2015; Ogledov: 149; Prenosov: 3
URL Polno besedilo (0,00 KB)

30.
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