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Search Results: 1 - 10 of 31096 matches for " Thomas Weidner "
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Model Checking Constraint LTL over Trees
Alexander Kartzow,Thomas Weidner
Computer Science , 2015,
Abstract: Constraint automata are an adaptation of B\"uchi-automata that process data words where the data comes from some relational structure S. Every transition of such an automaton comes with constraints in terms of the relations of S. A transition can only be fired if the current and the next data values satisfy all constraints of this transition. These automata have been used in the setting where S is a linear order for deciding constraint LTL with constraints over S. In this paper, S is the infinitely branching infinite order tree T. We provide a PSPACE algorithm for emptiness of T-constraint automata. This result implies PSPACE-completeness of the satisfiability and the model checking problem for constraint LTL with constraints over T.
The speed of frogs with drift on $\mathbb{Z}$
Thomas H?felsauer,Felizitas Weidner
Mathematics , 2015,
Abstract: In this article we consider the frog model with drift on $\mathbb{Z}$ and investigate the behaviour of the cloud of the frogs. In particular, we show that the speed of the minimum equals the speed of a single frog and prove some properties of the speed of the maximum. In addition, we show a limit theorem for the empirical distribution.
The stellar and sub-stellar IMF of simple and composite populations
Pavel Kroupa,Carsten Weidner,Jan Pflamm-Altenburg,Ingo Thies,Joerg Dabringhausen,Michael Marks,Thomas Maschberger
Physics , 2011, DOI: 10.1007/978-94-007-5612-0_4
Abstract: The current knowledge on the stellar IMF is documented. It appears to become top-heavy when the star-formation rate density surpasses about 0.1Msun/(yr pc^3) on a pc scale and it may become increasingly bottom-heavy with increasing metallicity and in increasingly massive early-type galaxies. It declines quite steeply below about 0.07Msun with brown dwarfs (BDs) and very low mass stars having their own IMF. The most massive star of mass mmax formed in an embedded cluster with stellar mass Mecl correlates strongly with Mecl being a result of gravitation-driven but resource-limited growth and fragmentation induced starvation. There is no convincing evidence whatsoever that massive stars do form in isolation. Various methods of discretising a stellar population are introduced: optimal sampling leads to a mass distribution that perfectly represents the exact form of the desired IMF and the mmax-to-Mecl relation, while random sampling results in statistical variations of the shape of the IMF. The observed mmax-to-Mecl correlation and the small spread of IMF power-law indices together suggest that optimally sampling the IMF may be the more realistic description of star formation than random sampling from a universal IMF with a constant upper mass limit. Composite populations on galaxy scales, which are formed from many pc scale star formation events, need to be described by the integrated galactic IMF. This IGIMF varies systematically from top-light to top-heavy in dependence of galaxy type and star formation rate, with dramatic implications for theories of galaxy formation and evolution.
Envelope Reconstruction of the 0S2 - free Oscillation of the Earth
Herbert Weidner
Physics , 2010,
Abstract: The earthquake in December 2004 caused free oscillations of the Earth. Vibrates the earth in the football mode 0S2, splits the natural frequency due to rotation into five closely adjacent individual components. The sum of these spectral components in the frequency band near 309 {\mu}Hz produces a beat that gives the overall amplitude envelope a characteristic, regular pattern. From the measured envelope the parameters frequency, amplitude, phase and damping of generating sinusoids can be reconstructed. Since the method is extremely sensitive to changes in frequency and phase, these quantities can be determined precisely. The results depend on the geographical location of the site. Further results are the half-life of the amplitude decrease and the resonator Q. It is shown that the interaction of the five individual frequencies can be interpreted as amplitude modulation, which requires a nonlinear process in the Earth's interior.
Grassmannians and Koszul duality
Jan Weidner
Mathematics , 2013, DOI: 10.1007/s00209-014-1345-z
Abstract: Let $X$ be a partial flag variety, stratified by orbits of the Borel. We give a criterion for the category of modular perverse sheaves to be equivalent to modules over a Koszul ring. This implies that modular category $\mathcal O$ is governed by a Koszul-algebra in small examples.
Modular equivariant formality
Jan Weidner
Mathematics , 2013,
Abstract: Let $X$ be a partial flag variety, equipped with the Borel action by multiplication. We give a criterion for the equivariant derived category with modular coefficients to be formal.
Antigen-Specific Th17 Cells Are Primed by Distinct and Complementary Dendritic Cell Subsets in Oropharyngeal Candidiasis
Kerstin Trautwein-Weidner,André Gladiator?,Florian R. Kirchner?,Simone Becattini?,Thomas Rülicke?,Federica Sallusto?,Salomé LeibundGut-Landmann
PLOS Pathogens , 2015, DOI: 10.1371/journal.ppat.1005164
Abstract: Candida spp. can cause severe and chronic mucocutaneous and systemic infections in immunocompromised individuals. Protection from mucocutaneous candidiasis depends on T helper cells, in particular those secreting IL-17. The events regulating T cell activation and differentiation toward effector fates in response to fungal invasion in different tissues are poorly understood. Here we generated a Candida-specific TCR transgenic mouse reactive to a novel endogenous antigen that is conserved in multiple distant species of Candida, including the clinically highly relevant C. albicans and C. glabrata. Using TCR transgenic T cells in combination with an experimental model of oropharyngeal candidiasis (OPC) we investigated antigen presentation and Th17 priming by different subsets of dendritic cells (DCs) present in the infected oral mucosa. Candida-derived endogenous antigen accesses the draining lymph nodes and is directly presented by migratory DCs. Tissue-resident Flt3L-dependent DCs and CCR2-dependent monocyte-derived DCs collaborate in antigen presentation and T cell priming during OPC. In contrast, Langerhans cells, which are also present in the oral mucosa and have been shown to prime Th17 cells in the skin, are not required for induction of the Candida-specific T cell response upon oral challenge. This highlights the functional compartmentalization of specific DC subsets in different tissues. These data provide important new insights to our understanding of tissue-specific antifungal immunity.
Mitos coletivos, narrativas pessoais: cura ritual, trabalho terapêutico e emergência do sujeito nas culturas da "Nova Era"
Maluf, S?nia Weidner;
Mana , 2005, DOI: 10.1590/S0104-93132005000200007
Abstract: over the last few years, urban brazil has seen the merging of new forms of spirituality with alternative therapeutic practices. different labels have been used to define these experiences. many anthropological and sociological publications, however, have already classified the phenomenon under the general rubric of new age cultures. this text aims to reconsider this type of work - and the accompanying spiritual practices - from the therapeutic point of view, as well as examining the procedures used to alleviate and cure illnesses or symptoms. issues such as the notion of work, ritual space and behaviours, ritual time and therapeutic time, the therapeutic relationship, narrative performances, symbolic mediators, the relation between collective myths and personal narratives are discussed and related to the central meanings of this type of work. the text concludes that each process of treatment involves substituting the object of the cure with the individual as a whole. one of the key meanings to emerge in the present work is the empowermnent of the individual and the emergence of the subject.
Corporalidade e desejo: Tudo sobre minha m?e e o gênero na margem
Revista Estudos Feministas , 2002, DOI: 10.1590/S0104-026X2002000100008
Abstract: this essays does a reading of pedro almodovar's film all about my mother, focusing on the transvestite character, agrado. after drawing a comparison with other films on the subject of transgendering, i discuss notions of embodiedness and the construction of the subject by placing them in the context of theories about the body in brazilian ethnology. my purpose is to offer some elements for a reflection on the experiences at/of the margins as a way of renewing the theoretical debates in feminist and gender studies. the bodily experience of 'becoming the other' dramatizes the mechanisms that are in play in the construction of difference and can be seen as an anti-hierarchical force destabilizing dominant politics of subjectivity.
Os dossiês da REF: além das fronteiras entre academia e militancia
Maluf, S?nia Weidner;
Revista Estudos Feministas , 2004, DOI: 10.1590/S0104-026X2004000300025
Abstract: this article analyzes the dossiers of revista estudos feministas. this section is published since the appearance of the journal on 1992. we describe each one of the 24 dossiers published until now and analyze it main characteristics. the main objective of the dossiers is to establish a dialogue between the feminist academic discussions and the feminist activism and politics. they are open to different styles of text beyond the academic paper. in the end of the article we analyze the place of the dossiers in the discussions about the tensions between academy and activism, trying to go beyond the dichotomies between action and reflection or between theory and practice.
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