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Search Results: 1 - 10 of 31450 matches for " Manuel Nicolas;Andrade "
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Orbit, masses and spectral analysis of the visual binary a 2329
Manuel Andrade
Revista mexicana de astronomía y astrofísica , 2007,
Abstract: Se presenta una órbita revisada de la binaria A 2329, calculada a partir de un conjunto de medidas interferométricas distribuidas a lo largo de un período orbital. En base a estos nuevos elementos orbitales y a la paralaje de Hipparcos se obtiene una masa dinámica para el sistema de 1:25 _ 0:14 M_. También se confirma, considerando nuevos datos espectrales, que el tipo espectral MK es K7V
Classification of split torsion torsionfree triples in module categories
Pedro Nicolas,Manuel Saorin
Mathematics , 2005,
Abstract: A TTF-triple $(\mathcal{C},\mathcal{T},\mathcal{F})$ in an abelian category is called 'one-sided split' in case either $(\mathcal{C},\mathcal{T})$ or $(\mathcal{T},\mathcal{F})$ is a split torsion theory. In this paper we classify one-sided split TTF-triples in module categories, thus completing Jans' classification of two-sided split TTF-triples and answering a question that has remained open for almost forty years.
Lifting and restricting recollement data
Pedro Nicolas,Manuel Saorin
Mathematics , 2008, DOI: 10.1007/s10485-009-9198-z
Abstract: We study the problem of lifting and restricting TTF triples (equivalently, recollement data) for a certain wide type of triangulated categories. This, together with the parametrizations of TTF triples given in "Parametrizing recollement data", allows us to show that many well-known recollements of right bounded derived categories of algebras are restrictions of recollements in the unbounded level, and leads to criteria to detect recollements of general right bounded derived categories. In particular, we give in Theorem 1 necessary and sufficient conditions for a 'right bounded' derived category of a differential graded(=dg) category to be a recollement of 'right bounded' derived categories of dg categories. In Theorem 2 we consider the particular case in which those dg categories are just ordinary algebras.
Parametrizing recollement data
Pedro Nicolas,Manuel Saorin
Mathematics , 2008,
Abstract: We give a general parametrization of all the recollement data for a triangulated category with a set of generators. From this we deduce a characterization of when a perfectly generated (or aisled) triangulated category is a recollement of triangulated categories generated by a single compact object. Also, we use homological epimorphisms of dg categories to give a complete and explicit description of all the recollement data for (or smashing subcategories of) the derived category of a k-flat dg category. In the final part we give a bijection between smashing subcategories of compactly generated triangulated categories and certain ideals of the subcategory of compact objects, in the spirit of Henning Krause's work. This bijection implies the following weak version of the Generalized Smashing Conjecture: in a compactly generated triangulated category every smashing subcategory is generated by a set of Milnor colimits of compact objects.
Generalized tilting theory
Pedro Nicolas,Manuel Saorin
Mathematics , 2012,
Abstract: We study necessary and sufficient conditions for a dg bimodule to yield triangle equivalences between (quotients of) the corresponding derived categories. This is related to recent work by Bazzoni-Mantese-Tonolo, Yang, Angeleri H\"ugel-Koenig-Liu, Chen-Xi, Bazzoni-Pavarin,... on large tilting modules, homological epimorphisms and recollements.
Balance in stable categories
Pedro Nicolas,Manuel Saorin
Mathematics , 2006, DOI: 10.1007/s10468-008-9113-6
Abstract: We study when the stable category of an abelian category modulo a full additive subcategory is balanced and, in case the subcategory is functorially finite, we study a weak version of balance. Precise necessary and sufficient conditions are given in case the subcategory is either a Serre class or a class consisting of projective objects. The results in this second case apply very neatly to (generalizations of) hereditary abelian categories.
Classical derived functors as fully faithful embeddings
Pedro Nicolas,Manuel Saorin
Mathematics , 2014,
Abstract: Given associative unital algebras $A$ and $B$ and a complex $T^\bullet$ of $B-A-$bi\-modules, we give necessary and sufficient conditions for the total derived functors, $\Rh_A(T^\bullet,?):\D(A)\longrightarrow\D(B)$ and $?\Lt_BT^\bullet:\D(B)\longrightarrow\D(A)$, to be fully faithful. We also give criteria for these functors to be one of the fully faithful functors appearing in a recollement of derived categories. In the case when $T^\bullet$ is just a $B-A-$bimodule, we connect the results with (infinite dimensional) tilting theory and show that some open question on the fully faithfulness of $\Rh_A(T,?)$ is related to the classical Wakamatsu tilting problem.
A geografia no contexto das ciências sociais em Pernambuco
Andrade, Manuel Correia de;
Revista Brasileira de Ciências Sociais , 2007, DOI: 10.1590/S0102-69092007000300002
Abstract: in this unpublished paper manuel correia de andrade presents a historical tracing on the transforming process in the field of geography in brazil, dealing especially with the state of pernambuco. the author tries to delimitate both in space and time what geography would be, as well as its relations with the various natural and social sciences that are close to or interpenetrated within. he analyzes, then, the commencements of such process in the beginning of the twentieth century with studies, not always considered geographical, passing through crucial moments such as the foundation of the brazilian association of geographers in the 1930s, the flourishing of the field in the 1950s, and the impact of the military coup d?état of 1964 in the area of geographic studies.
Silting Theory in triangulated categories with coproducts
Pedro Nicolas,Manuel Saorin,Alexandra Zvonareva
Mathematics , 2015,
Abstract: We introduce the notion of noncompact (partial) silting and (partial) tilting sets and objects in any triangulated category D with arbitrary (set-indexed) coproducts. We show that equivalence classes of partial silting sets are in bijection with t-structures generated by their co-heart whose heart has a generator, and in case D is compactly generated, this bijection restricts to one between equivalence classes of self-small partially silting objects and left nondegenerate t-structures in D whose heart is a module category and whose associated cohomological functor preserves products. We describe the objects in the aisle of the t-structure associated to a partial silting set T as the Milnor (aka homotopy) colimit of sequences of morphisms with succesive cones in Sum(T)[n]. We use this fact to develop a theory of tilting objects in very general AB3 abelian categories, a setting and its dual on which we show the validity of several well-known results of tilting and cotilting theory of modules. Finally, we show that if T is a bounded tilting set in a compactly generated algebraic triangulated category D and H is the heart of the associated t-structure, then the inclusion of H in D extends to a triangulated equivalence between the derived category D(H) of H and the ambient triangulated category D which restricts to bounded levels.
Evolu??o clínica tardia dos stents farmacológicos: seguran?a e eficácia até cinco anos do Registro DESIRE
Sousa, Amanda Guerra de Moraes Rego;Costa Junior, José Ribamar;Moreira, Adriana;Costa, Ricardo Alves da;Cano, Manuel Nicolas;Andrade, Galo Alfredo Maldonado;Abizaid, Alexandre Antonio Cunha;Feres, Fausto;Mattos, Luiz Alberto Piva e;Staico, Rodolfo;Pavanello, Ricardo;Egito, Enilton Sergio Tabosa do;Sousa, José Eduardo Moraes Rego;
Revista Brasileira de Cardiologia Invasiva , 2007, DOI: 10.1590/S2179-83972007000300006
Abstract: background: indications for the implantation of sirolimusand paclitaxel-eluting stents are expanding and include complex lesions and subsets of patients with clinical and demographic characteristics very different from those of early pivotal randomized trials. the desire registry was planned to monitor the safety of both cypher? and taxus? stent available in brazil since 2002. methods and results: from may 2002 through march 2007, 2043 patients treated with one or more than one stent (either cypher? or taxus?) at hospital do cora??o da associa??o do sanatório sírio were included in this registry. mean age was 63.8 (11.3) years; 76.6% were male and 28.4% had diabetes. a total of 2,415 lesions were treated and 2,983 stents were implanted: 2,608 cypher? and 375 taxus?. acute and subacute (<30 days); late thrombosis (31 days - 360 days) and very late thrombosis (>360 days) occurred in 0.34%, 0.73% and 0.34% of the patients, adding up to a 1.42% overall rate. likewise, the major adverse cardiac event rate was low and added up to 8.6% (154 patients), including: 45 (2.51%) cardiac deaths; 50 (2.8%) myocardial infarctions and 59 (3.3%) of additional revascularizations. conclusions: this long-term analysis of the desire registry shows the high efficacy and safety profiles of drug-eluting stents, with a low thrombosis rate, which is similar to those of randomized trials.
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