3,197 research outputs found
Lattice-Renormalization of the Polyakov Loop
No full textZantow F. Lattice-Renormalization of the Polyakov Loop. Bielefeld: Fakultät für Physik; 2003
Three Paradigms of Juridical Knowledge: to Anniversary of Professor A. V. Polyakov
No full textArticle is dedicated to the 60-year anniversary of the professor of the chair of theory and law history and state of St. Petersburg State University, doctor of juridical sciences Andrey Vasilyevich Polyakov. In the article are analyzed some basic ideas of the communicative theory of law, creator of which is A. V. Polyakov. In this case the communicative theory of law by A. V. Polyakov it is considered in context of the processes, which characterize the development of the juridical science, by which, as for any other sciences, is inherent the sequential change of the paradigms of knowledge. In the article are separated three such paradigms, namely pre-classical, classical and postclassical. The author assumes that ideas of A. V. Polyakov, who is the best-known representative of the post-classical theory of law in Russia, they stimulate the change of the paradigms of lawful knowledge and thus contribute to overcoming crisis phenomena in the juridical science
Dispersive evaluation of the D-term form factor in deeply virtual Compton scattering
No full textAbstractWe present a dispersive representation of the D-term form factor for hard exclusive reactions, using unsubtracted t-channel dispersion relations. The t-channel unitarity relation is saturated with the contribution of two-pion intermediate states, using the two-pion distributions amplitude for the γ⁎γ→ππ subprocess and reconstructing the ππ→NN¯ subprocess from available information on pion-nucleon partial-wave helicity amplitudes. Results for the D-term form factor as function of t as well as at t=0 are discussed in comparison with available model predictions and phenomenological parametrizations
Investigation and development of the intelligent voice assistant for the Internet of Things using machine learning
No full textArtificial intelligence technologies are beginning to be actively used in human life, this is facilitated by the appearance and wide dissemination of the Internet of Things (IoT). Autonomous devices are becoming smarter in their way to interact with both a human and themselves. New capacities lead to creation of various systems for integration of smart things into Social Networks of the Internet of Things. One of the relevant trends in artificial intelligence is the technology of recognizing the natural language of a human. New insights in this topic can lead to new means of natural human-machine interaction, in which the machine would learn how to understand human's language, adjusting and interacting in it. One of such tools is voice assistant, which can be integrated into many other intelligent systems. In this paper, the principles of the functioning of voice assistants are described, its main shortcomings and limitations are given. The method of creating a local voice assistant without using cloud services is described, which allows to significantly expand the applicability of such devices in the future
On Existence of Bounded Feasible Solutions to Neumann Boundary Control Problem for p-Laplace Equation with Exponential Type of Nonlinearity
No full textWe study an optimal control problem for mixed Dirichlet-Neumann boundary value problem for
the strongly non-linear elliptic equation with -Laplace operator and -nonlinearity in its right-hand side. A distribution acting on a part of boundary
of open domain is taken as a boundary control. The optimal control problem is to minimize the
discrepancy between a given distribution and the
current system state. We deal with such case of nonlinearity when we cannot expect to have a solution of the state equation for any admissible control. After defining a suitable functional class in which we look for solutions and assuming that this problem admits at least one feasible solution, we prove the existence of optimal pairs. We derive also conditions when the set of feasible solutions has a nonempty intersection with the space of bounded distributions
Geração radiativa de repulsão vetorial para quarks leves
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Física, Florianópolis, 2014Abstract: We apply a non-perturbative analytical method, known as the Optimized PerturbationTheory (OPT), to the Polyakov-Nambu-Jona-Lasinio (PNJL) model in order to investigate physical quantities associated with the QCD phase transitions. We consider the Taylor expansion of the pressure in powers of µ/T obtaining the second cumulant (c2) which is associated to the quark number susceptibility. We discuss how the OPT nite Nc radiative (quantum) corrections induce a contribution to the pressure which behaves as a vector repulsion even when such a channel is absent in the original classical potential. Our results are then compared with the ones furnished by lattice QCD simulations and by the large-Nc approximation showing that, physically, the OPT results resemble those furnished by the latter approximation when a repulsive vector channel is explicitly included in the classical potential. In this case, both approximations fail to correctly describe the Stefan-Boltzmann limit at high temperatures. We discuss how this problem can be circumvented by taking the couplings to be temperature dependent so as to simulate the phenomenon of asymptotic freedom. Since this is the first time the OPT is applied to the PNJL we also discuss many technicalities associated with the evaluation of two loop (exchange) diagrams.Neste trabalho o método analítico não perturbativo conhecido como Teoria de Perturbação Otimizada (OPT) é aplicada ao modelo de Polyakov-Nambu-Jona-Lasinio (PNJL) para que quantidades físicas, associadas com as transições de fase da QCD, possam ser calculadas. A expansão da pressão em potências de µ/T é considerada para obter o segundo cumulante (c2) que é uma quantidade relacionada com a susceptibilidade do número de quarks. Primeiramente discutimos como as correções radiativas de Nc finito geradas pela OPT produzem uma contribuição que se comporta como um termo vetorial repulsivo mesmo quando este tipo de canal está ausente no potencial clássico original. Em seguida, nossos resultados são comparados com aqueles fornecidos pelas simulações na rede e também pela aproximação de Nc grande(LN). Fisicamente, os resultados da OPT são similares aqueles fornecidos pela aproximação LN quando um canal vetorial repulsivo é explicitamente incluido no potencial clássico. Neste caso, nenhuma destas aproximações analíticas produz corretamente o limite de Stefan Boltzmann para altas temperaturas. Contudo, nossos resultados sugerem como estes problemas podem ser contornados tomando-se as constantes de acoplamento como sendo dependentes da temperatura, de maneira que o fenômeno da liberdade assimptótica possa ser simulado. Esta é a primeira vez que a OPT é aplicada ao modelo de PNJL e por isto vários aspectos técnicos relacionados com o cálculo de diagramas de dois laços são também aqui apresentados
General theory of law in the integrate context: the continuation of the dialogue (devoted to the second edition of the manual A. V. Polyakov “General theory of law: problems of interpretation in the context of the communicative approach”)
No full textOn the one hand, the author appreciates the integrate and communicative approaches, developed by
A. V. Poyakov. On the other hand, the author considers it necessary to continue the dialogue about
these approaches with a view to their improvement, as well as the dialogue on the problems and the
prospects of the Russian theory of law in the light of these approaches. The reason for the article was
the release of the second edition of the textbook of A. V. Polyakov “General theory of law. A course
of lectures”. It is examined the relevance of this edition. This relevance is due to persistence in the
general theory of law of dominant positions of statism, positivism, as well as the theory of natural law.
Both that, and another, and the third significantly limits the legal communication, makes it imperfect.
The author examines the philosophical and methodological novelty, as well as the advantages of the
A. V. Polyakov`s tutorial in light of accents made the new edition. Chief among those accents is the
concept of a full-featured legal communication. It is explored the question, why the communicative
theory of law among Russian scientists caused and continues to cause negative assessments and sharp
criticism. The reasons for such assessments include a one-sided attention to “postclassical” provisions
and ignoring the neoclassical provisions that complement the latter in the works of A. V. Polyakov. The
article contains suggestions for improving the integrate and communicative approaches. The most
appropriate form of implementation of these suggestions, is an updated version of the system presentation
of communicative theory of law in the form of a textbook or monograph. Refs 28
Testing a theoretical resistance law for overland flow under simulated rainfall with different types of vegetation
No full textIn this paper a recently theoretically deduced flow resistance equation, based on a power-velocity profile, was tested using data collected for overland flow under simulated rainfall carried out in plots with vegetation. The available data were obtained exploring a wide range of rainfall intensities (from 60 to 181 mm h−1) and slopes (from 3.6 to 39.6%), and with four different types of vegetation. The database, including measurements of flow velocity, water depth, cross sectional flow area, wetted perimeter and bed slope, was divided in four datasets (one for each vegetation type), which allowed the calibration of the relationship between the velocity profile parameter Γ, the slope steepness, the flow Froude number, and the rainfall Reynolds number. The effect of rainfall intensity and different types of vegetation on flow resistance was investigated. The results showed that the theoretically deduced flow resistance equation allowed an accurate estimate of the Darcy-Weisbach friction factor for overland flow under simulated rainfall and in presence of vegetation. The developed analysis also suggested that flow resistance increases with rainfall intensity for laminar overland flow. The available data demonstrated that a quasi-independence between slope and mean velocity occurred. Finally, a single flow resistance equation resulted applicable to all investigated vegetation types and this equation was affected by flow regime represented by flow Reynolds number
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