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Search Results: 1 - 10 of 462101 matches for " ?erban A. Basarab "
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On the arboreal structure of right-angled Artin groups
erban A. Basarab
Mathematics , 2009,
Abstract: The present article continues the study of median groups initiated in [6, 9, 10]. Some classes of median groups are introduced and investigated with a stress upon the class of the so called A-groups which contains as remarkable subclasses the lattice ordered groups and the right-angled Artin groups. Some general results concerning A-groups are applied to a systematic study of the arboreal structure of right-angled Artin groups. Structure theorems for foldings, directions, quasidirections and centralizers are proved.
Arithmetic-arboreal residue structures induced by Prufer extensions : An axiomatic approach
Serban A. Basarab
Mathematics , 2010,
Abstract: We present an axiomatic framework for the residue structures induced by Prufer extensions with a stress upon the intimate connection between their arithmetic and arboreal theoretic properties. The main result of the paper provides an adjunction relationship between two naturally defined functors relating Prufer extensions and superrigid directed commutative regular quasi-semirings.
A more general framework for coGalois theory
Serban A. Basarab
Mathematics , 2013,
Abstract: The paper is an extended version of a talk given at the International Conference: Experimental and Theoretical Methods in Algebra, Geometry and Topology, which took place June 21--24, 2013 in Eforie Nord (Romania). Its purpose is to present a more general framework for a fairly new theory in Field Theory, called coGalois Theory, which is somewhat dual to the very classical Galois Theory and is more general than the Kummer Theory. The main object of investigation in this more general framework is the coGalois connexion naturally associated to any triple $\,(\Gamma, \frak{G}, \eta)\,$, where $\,\Gamma\,$ is a profinite group, $\,\frak{G}\,$ is a profinite operator $\,\Gamma$-group, and $\,\eta: \Gamma \longrightarrow \frak{G}\,$ is a continuous $\,1$-cocycle with the property that the profinite group $\,\frak{G}\,$ is topologically generated by the image $\,\eta(\Gamma)$.
Embedding theorems for actions on generalized trees, I
Serban A. Basarab
Mathematics , 2010,
Abstract: Using suitable deformations of simplicial trees and the duality theory for median sets, we show that every free action on a median set can be extended to a free and transitive one. We also prove that the category of median groups is a reflective full subcategory of the category of free actions on pointed median sets.
The vampire of the third millennium: from demon to angel
Codru?a Gosa,Andreea ?erban
Oceánide , 2012,
Abstract: Starting from the idea that there is a soaring interest in vampire-related products at the dawn of the new millennium, our paper will explore how the vampire figure is contextualised and shaped when it comes to his appearance and behaviour. The corpus of our analysis includes three of the most popular films to date: Twilight, Vampire Diaries and True Blood. The aim of our study is to compare and contrast the vampire protagonists these three films instantiate and also to identify any major shifts from the ‘classic’ conceptualisation of the vampire. Furthermore, we will try to understand how these transformations could account for the popularity of the vampire figure in general and among teenagers in particular.
Successful Biological Invasion despite a Severe Genetic Load
Amro Zayed,erban A. Constantin, Laurence Packer
PLOS ONE , 2007, DOI: 10.1371/journal.pone.0000868
Abstract: Understanding the factors that influence the success of ecologically and economically damaging biological invasions is of prime importance. Recent studies have shown that invasive populations typically exhibit minimal, if any, reductions in genetic diversity, suggesting that large founding populations and/or multiple introductions are required for the success of biological invasions, consistent with predictions of the propagule pressure hypothesis. Through population genetic analysis of neutral microsatellite markers and a gene experiencing balancing selection, we demonstrate that the solitary bee Lasioglossum leucozonium experienced a single and severe bottleneck during its introduction from Europe. Paradoxically, the success of L. leucozonium in its introduced range occurred despite the severe genetic load caused by single-locus complementary sex-determination that still turns 30% of female-destined eggs into sterile diploid males, thereby substantially limiting the growth potential of the introduced population. Using stochastic modeling, we show that L. leucozonium invaded North America through the introduction of a very small number of propagules, most likely a singly-mated female. Our results suggest that chance events and ecological traits of invaders are more important than propagule pressure in determining invasion success, and that the vigilance required to prevent invasions may be considerably greater than has been previously considered.
Acute Appendicitis following Laparoscopic Live Donor Nephrectomy
A. Kumar,H. Elenin,C. Clayton,C. Basarab-Horwath
International Journal of Organ Transplantation Medicine , 2010,
Abstract: Acute abdominal pain following laparoscopic live donor nephrectomy (LLDN) might be a diagnostic dilemma,and prompt diagnosis and management is of paramount importance. Herein, we describe a case of acute appendicitis in a 62-year-old kidney donor who presented with acute abdominal pain 16 days following LLDN with features inconsistent with a diagnosis of acute appendicitis. An ultrasound scan suggested strangulatedSpigelian hernia unrelated to the operative wound. Exploration of the wound and mini-laparotomy showed no evidence of wound dehiscence or a hernia, but revealed an inflamed appendix wrapped up with omentum. Appendectomy led to complete recovery of the patient. It is imperative to maintain a high index of suspicion for acute appendicitis in this situation to avoid septic complications that might adversely affect the residual renal function and cause negative impact on kidney donation. To the best of our knowledge, this is the first reported case of acute appendicitis following LLDN.
The Odderon at RHIC and LHC
Nicolescu, Basarab
High Energy Physics - Phenomenology , 2007,
Abstract: The Odderon remains an elusive object, 33 years after its invention. The Odderon is now a fundamental object in QCD and CGC and it has to be found experimentally if QCD and CGC are right. In the present talk, we show how to find it at RHIC and LHC. The most spectacular signature of the Odderon is the predicted difference between the differential cross-sections for proton-proton and antiproton-proton at high s and moderate t. This experiment can be done by using the STAR detector at RHIC and by combining these future data with the already present UA4/2 data. The Odderon could also be found by ATLAS experiment at LHC by performing a high-precision measurement of the real part of the hadron elastic scattering amplitude at small t.
The Odderon in Theory and Experiment - A mini-Review
Basarab Nicolescu
Physics , 1998,
Abstract: We review recent theoretical and phenomenological results on both the perturbative and non-perturbative Odderon. The HERA type of experiments constitutes a direct probe of the Odderon.
The Two-Component Non-Perturbative Pomeron and the G-Universality
Basarab Nicolescu
Physics , 2000, DOI: 10.1016/S0920-5632(01)01304-4
Abstract: In this communication we present a generalization of the Donnachie-Landshoff model inspired by the recent discovery of a 2-component Pomeron in LLA-QCD by Bartels, Lipatov and Vacca. In particular, we explore a new property, not present in the usual Regge theory - the G-Universality - which signifies the independence of one of the Pomeron components on the nature of the initial and final hadrons. The best description of all the forward hadron-hadron, gamma- gamma and gamma-proton data is obtained when G-universailty is imposed. Moreover, the maximal (ln)**2 behaviour of the hadron amplitude, first established by Heisenberg, is clearly favoured by the data.
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