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Search Results: 1 - 10 of 645 matches for " Katarina Oblak "
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Carnian Foraminifera from the Kucler quarry at Lesno Brdo (Slovenia)
Katarina Oblak
Geologija , 2001,
Most abundant Middle Miocene rotaliinas (suborder Rotaliina, Foraminifera) of Kozjansko (Eastern Slovenia)
Katarina Oblak
Geologija , 2007,
Abstract: This research presents the most numerous Middle Miocene foraminifera of the suborder Rotaliina from the Planina syncline in Kozjansko. 85 species and 2 subspecies have been identified.The species that show abundance in samples are: Angulogerina angulosa,Trifarina bradyi, Sphaeroidina bulloides, Cibicidoides ungerianus, Nonion commune, Melonis pompilioides, Pullenia bulloides, Heterolepa dutemplei, Hansenisca soldanii and Hanzawaia boueana.
Badenian Pappinidae and Uvigerinidae from the South-western margin of the Pannonian Basin (Eastern Slovenia)
Katarina Oblak Brown
Geologija , 2011,
Abstract: This study identifies fourteen foraminiferal species of families Pappinidae and Uvigerinidae, found in Badenian sediments of Eastern Slovenia (six sections in the Planina syncline). Two of the species, Uvigerina bellicostata and Angulogerina esuriensis are identified in Slovenia for the first time. Determined species show characteristic Central Paratethyan biostratigraphic distribution throughout the studied sections, allowing the positioning of a Late MiddleBadenian foraminiferal Zone named after the species Uvigerina cf. pygmea.
From the Lorentz Group to the Celestial Sphere
Blagoje Oblak
Physics , 2015,
Abstract: In these lecture notes we review the isomorphism between the (connected) Lorentz group and the set of conformal transformations of the sphere. More precisely, after establishing the main properties of the Lorentz group, we show that it is isomorphic to the group SL(2,C) of complex 2 by 2 matrices with unit determinant. We then classify conformal transformations of the sphere, define the notion of null infinity in Minkowski space-time, and show that the action of Lorentz transformations on the celestial spheres at null infinity is precisely that of conformal transformations. In particular, we discuss the optical phenomena observed by the pilots of the "Millenium Falcon" during the jump to lightspeed.
The upper bound for the index of nilpotency for a matrix commuting with a given nilpotent matrix
Polona Oblak
Mathematics , 2007,
Abstract: We study the set $\partition{\nb}$ of all possible Jordan canonical forms of nilpotent matrices commuting with a given nilpotent matrix $B$. We describe $\partition{\nb}$ in the special case when $B$ has only one Jordan block. In the general case, we find the maximal possible index of nilpotency in the set of all nilpotent matrices commuting with a given nilpotent matrix. We consider several examples.
Jordan forms for mutually annihilating nilpotent pairs
Polona Oblak
Mathematics , 2006,
Abstract: In this paper we completely characterize all possible pairs of Jordan canonical forms for mutually annihilating nilpotent pairs, i.e. pairs $(A,B)$ of nilpotent matrices such that $AB=BA=0$.
Characters of the BMS Group in Three Dimensions
Blagoje Oblak
Mathematics , 2015, DOI: 10.1007/s00220-015-2408-7
Abstract: Using the Frobenius formula, we evaluate characters associated with certain induced representations of the centrally extended BMS$_3$ group. This computation involves a functional integral over a coadjoint orbit of the Virasoro group; a delta function localizes the integral to a single point, allowing us to obtain an exact result. The latter is independent of the specific form of the functional measure, and holds for all values of the BMS$_3$ central charges and all values of the chosen mass and spin. It can also be recovered as a flat limit of Virasoro characters.
On the nilpotent commutator of a nilpotent matrix
Polona Oblak
Mathematics , 2011,
Abstract: We study the structure of the nilpotent commutator $\nb$ of a nilpotent matrix $B$. We show that $\nb$ intersects all nilpotent orbits for conjugation if and only if $B$ is a square--zero matrix. We describe nonempty intersections of $\nb$ with nilpotent orbits in the case the $n \times n$ matrix $B$ has rank $n-2$. Moreover, we give some results on the maximal nilpotent orbit that $\nb$ intersects nontrivially.
Toll-Like Receptor 4 Activation in Cancer Progression and Therapy
Alja Oblak,Roman Jerala
Clinical and Developmental Immunology , 2011, DOI: 10.1155/2011/609579
Abstract: Cancer immunotherapy has been the focus of intense research since the late 19th century when Coley observed that bacterial components can contribute to cancer regression by eliciting an antitumor immune response. Successful activation and maturation of tumor-specific immune cells is now known to be mediated by bacterial endotoxin, which activates Toll-like receptor 4 (TLR4). TLR4 is expressed on a variety of immune as well as tumor cells, but its activation can have opposing effects. While TLR4 activation can promote antitumor immunity, it can also result in increased tumor growth and immunosuppression. Nevertheless, TLR4 engagement by endotoxin as well as by endogenous ligands represents notable contribution to the outcome of different cancer treatments, such as radiation or chemotherapy. Further research of the role and mechanisms of TLR4 activation in cancer may provide novel antitumor vaccine adjuvants as well as TLR4 inhibitors that could prevent inflammation-induced carcinogenesis.
Digital splits: Web culture in Ljubljana and Maribor through class and cultural differentiations
Tanja Oblak ?rni?
Dru?boslovne Razprave , 2012,
Abstract: The paper presents an in-depth analysis of the recent ‘divide’ between the digitally rich and the digitally poor that seems to be a new source of social inequality. Based on a quantitative survey on a representative sample of residents in the two biggest Slovenian cities – Ljubljana and Maribor – the author argues that digital culture is not a space of class emancipation, but remains a sphere where the usual social, cultural and class inequalities continue to (re)emerge. While the questions of digital access, shown in three groups of motivational exclusion, intentional self-exclusion and general exclusion, is not a consequence of class divisions, the level of digital inclusion and participation in digital culture are statistically related with class structure and cultural capital. The four different groups of digital audiences – digital poor, digital sceptics, digital mainstream and digital elite – clearly repeat the general inequalities between them on the class level and show specific ways of participation in culture and media consumption. The two digitally weakest groups are on average the most excluded from other cultural practices and the lowest on the class structure, whereas the highest level of high class belongs to the digital elite. The paper therefore argues that digital culture is an intertwined social phenomenon not simply related to an individual’s socio-demographic situation, but is also strongly connected with its class and cultural capital.
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