The Experts below are selected from a list of 25518 Experts worldwide ranked by ideXlab platform
Michel Le Goffic - One of the best experts on this subject based on the ideXlab platform.
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divergence in the evolution of paleolithic Symbolic and technological systems the shining bull and engraved tablets of rocher de l imperatrice
PLOS ONE, 2017Co-Authors: Nicolas Naudinot, Camille Bourdier, Marine Laforge, Celine Paris, Ludovic Bellotgurlet, Sylvie Beyries, Isabelle Theryparisot, Michel Le GofficAbstract:The development of the Azilian in Western Europe 14,000 years ago is considered a "revolution" in Upper Paleolithic Archaeology. One of the main elements of this rapid social restructuring is the abandonment of naturalistic figurative art on portable pieces or on cave walls in the Magdalenian in favor of abstract Expression on small pebbles. Recent work shows that the transformation of human societies between the Magdalenian and the Azilian was more gradual. The discovery of a new Early Azilian site with decorated stones in France supports this hypothesis. While major changes in stone tool technology between the Magdalenian and Azilian clearly mark important adaptive changes, the discovery of 45 engraved schist tablets from archaeological layers at Le Rocher de l'Imperatrice attests to iconographic continuity together with special valorization of aurochs as shown by a "shining" bull depiction. This evidence suggests that some cultural features such as iconography may lag far behind technological changes. We also argue that eventual change in Symbolic Expression, which includes the later disappearance of figurative art, provides new insight into the probable restructuring of the societies.
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divergence in the evolution of paleolithic Symbolic and technological systems the shining bull and engraved tablets of rocher de l imperatrice
PLOS ONE, 2017Co-Authors: Nicolas Naudinot, Camille Bourdier, Marine Laforge, Celine Paris, Ludovic Bellotgurlet, Sylvie Beyries, Isabelle Theryparisot, Michel Le GofficAbstract:The development of the Azilian in Western Europe 14,000 years ago is considered a "revolution" in Upper Paleolithic Archaeology. One of the main elements of this rapid social restructuring is the abandonment of naturalistic figurative art on portable pieces or on cave walls in the Magdalenian in favor of abstract Expression on small pebbles. Recent work shows that the transformation of human societies between the Magdalenian and the Azilian was more gradual. The discovery of a new Early Azilian site with decorated stones in France supports this hypothesis. While major changes in stone tool technology between the Magdalenian and Azilian clearly mark important adaptive changes, the discovery of 45 engraved schist tablets from archaeological layers at Le Rocher de l'Imperatrice attests to iconographic continuity together with special valorization of aurochs as shown by a "shining" bull depiction. This evidence suggests that some cultural features such as iconography may lag far behind technological changes. We also argue that eventual change in Symbolic Expression, which includes the later disappearance of figurative art, provides new insight into the probable restructuring of the societies.
Viacheslav Bunichev - One of the best experts on this subject based on the ideXlab platform.
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Symbolic Expressions for fully differential single top quark production cross section and decay width of polarized top quark in the presence of anomalous w t b couplings
Physical Review D, 2020Co-Authors: Edward E Boos, Viacheslav BunichevAbstract:Spin correlations in the t-channel single top quark production and its subsequent decay are investigated for the case of contributions involving anomalous Wtb couplings. We obtain analytical Expressions for the differential widths for the three-particle decay of a polarized t quark in its rest frame and also Expressions for the differential cross sections of the full process of production and decay of the t quark ($2\to 4$) as a function of the energy of a charged lepton and two angles of orientation of the quantization axis of the t-quark spin. The Expression is presented in the most general form for the case of real and imaginary vector and tensor anomalous Wtb couplings. We show that shapes of certain multidimensional kinematic distributions of final state particles are significantly different for the contributions proportional to different combinations of the anomalous couplings. The most noticeable differences appear in the shape of the surfaces of two-dimensional distributions, where one of the variables is the energy of a charged lepton and the other is one of the t-quark spin orientation angles. Observed properties are confirmed by two methods of computations either from the obtained Symbolic Expression for the differential cross sections of the full process of the polarized single top quark production with its subsequent decay or by means of the CompHEP program for the complete process involving the t-channel single top. In addition, using the obtained analytical Expressions, we estimate the statistical accuracy of extracting values of the anomalous Wtb couplings for different levels of the expected integral luminosity at the LHC.
Nicolas Naudinot - One of the best experts on this subject based on the ideXlab platform.
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divergence in the evolution of paleolithic Symbolic and technological systems the shining bull and engraved tablets of rocher de l imperatrice
PLOS ONE, 2017Co-Authors: Nicolas Naudinot, Camille Bourdier, Marine Laforge, Celine Paris, Ludovic Bellotgurlet, Sylvie Beyries, Isabelle Theryparisot, Michel Le GofficAbstract:The development of the Azilian in Western Europe 14,000 years ago is considered a "revolution" in Upper Paleolithic Archaeology. One of the main elements of this rapid social restructuring is the abandonment of naturalistic figurative art on portable pieces or on cave walls in the Magdalenian in favor of abstract Expression on small pebbles. Recent work shows that the transformation of human societies between the Magdalenian and the Azilian was more gradual. The discovery of a new Early Azilian site with decorated stones in France supports this hypothesis. While major changes in stone tool technology between the Magdalenian and Azilian clearly mark important adaptive changes, the discovery of 45 engraved schist tablets from archaeological layers at Le Rocher de l'Imperatrice attests to iconographic continuity together with special valorization of aurochs as shown by a "shining" bull depiction. This evidence suggests that some cultural features such as iconography may lag far behind technological changes. We also argue that eventual change in Symbolic Expression, which includes the later disappearance of figurative art, provides new insight into the probable restructuring of the societies.
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divergence in the evolution of paleolithic Symbolic and technological systems the shining bull and engraved tablets of rocher de l imperatrice
PLOS ONE, 2017Co-Authors: Nicolas Naudinot, Camille Bourdier, Marine Laforge, Celine Paris, Ludovic Bellotgurlet, Sylvie Beyries, Isabelle Theryparisot, Michel Le GofficAbstract:The development of the Azilian in Western Europe 14,000 years ago is considered a "revolution" in Upper Paleolithic Archaeology. One of the main elements of this rapid social restructuring is the abandonment of naturalistic figurative art on portable pieces or on cave walls in the Magdalenian in favor of abstract Expression on small pebbles. Recent work shows that the transformation of human societies between the Magdalenian and the Azilian was more gradual. The discovery of a new Early Azilian site with decorated stones in France supports this hypothesis. While major changes in stone tool technology between the Magdalenian and Azilian clearly mark important adaptive changes, the discovery of 45 engraved schist tablets from archaeological layers at Le Rocher de l'Imperatrice attests to iconographic continuity together with special valorization of aurochs as shown by a "shining" bull depiction. This evidence suggests that some cultural features such as iconography may lag far behind technological changes. We also argue that eventual change in Symbolic Expression, which includes the later disappearance of figurative art, provides new insight into the probable restructuring of the societies.
Edward E Boos - One of the best experts on this subject based on the ideXlab platform.
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Symbolic Expressions for fully differential single top quark production cross section and decay width of polarized top quark in the presence of anomalous w t b couplings
Physical Review D, 2020Co-Authors: Edward E Boos, Viacheslav BunichevAbstract:Spin correlations in the t-channel single top quark production and its subsequent decay are investigated for the case of contributions involving anomalous Wtb couplings. We obtain analytical Expressions for the differential widths for the three-particle decay of a polarized t quark in its rest frame and also Expressions for the differential cross sections of the full process of production and decay of the t quark ($2\to 4$) as a function of the energy of a charged lepton and two angles of orientation of the quantization axis of the t-quark spin. The Expression is presented in the most general form for the case of real and imaginary vector and tensor anomalous Wtb couplings. We show that shapes of certain multidimensional kinematic distributions of final state particles are significantly different for the contributions proportional to different combinations of the anomalous couplings. The most noticeable differences appear in the shape of the surfaces of two-dimensional distributions, where one of the variables is the energy of a charged lepton and the other is one of the t-quark spin orientation angles. Observed properties are confirmed by two methods of computations either from the obtained Symbolic Expression for the differential cross sections of the full process of the polarized single top quark production with its subsequent decay or by means of the CompHEP program for the complete process involving the t-channel single top. In addition, using the obtained analytical Expressions, we estimate the statistical accuracy of extracting values of the anomalous Wtb couplings for different levels of the expected integral luminosity at the LHC.
Samuel Rota Bulò - One of the best experts on this subject based on the ideXlab platform.
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explicit solutions for queues with hypo or hyper exponential service time distribution and application to product form approximations
Performance Evaluation, 2014Co-Authors: Andrea Marin, Samuel Rota BulòAbstract:Abstract Queueing systems with Poisson arrival processes and Hypo- or Hyper-exponential service time distribution have been widely studied in the literature. Their steady-state analysis relies on the observation that the infinitesimal generator matrix has a block-regular structure and, hence, the matrix analytic method may be applied. Let π n k be the steady-state probability of observing the k th phase of service and n customers in the queue, with 1 ≤ k ≤ K , and K the number of phases, and let π n = ( π n 1 , … , π n K ) . Then, it is well-known that there exists a rate matrix R such that π n + 1 = π n R . In this paper, we give a Symbolic Expression for such a matrix R for both cases of Hypo- and Hyper-exponential queueing systems. Then, we exploit this result in order to address the problem of approximating a M / HYPO K / 1 queue by a product-form model. We show that the knowledge of the Symbolic Expression of R allows us to specify the approximations for more general models than those that have been previously considered in the literature and with higher accuracy.
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explicit solutions for queues with hypo exponential service time and applications to product form analysis
Performance Evaluation Methodolgies and Tools, 2011Co-Authors: Andrea Marin, Samuel Rota BulòAbstract:Queueing systems with Poisson arrival processes and Hypo-exponential service time distribution have been widely studied in literature. Their steady-state analysis relies on the observation that the infinitesimal generator matrix has a block-regular structure and, hence, matrix-analytic method may be applied. Let πnk be the steady-state probability of observing the k-th stage of service busy and n customers in the queue, with 1 ≤ k ≤ K, and K the number of stages, and let πn = (πn1,..., πnK). Then, it is well-known that there exists a rate matrix R such that πn+1 = πnR. In this paper we give a Symbolic Expression for such a matrix R. Then, we exploit this result in order to address the problem of approximating a M/HypoK/1 queue by a model with initial perturbations which yields a product-form stationary distribution. We show that the result on the rate matrix allows us to specify the approximations for more general models than those that have been previously considered in literature and with higher accuracy.
