The role of environmental correlations in the non-Markovian dynamics of a spin system

We put forward a framework to study the dynamics of a chain of interacting quantum particles affected by individual or collective multi-mode environment, focussing on the role played by the environmental quantum correlations over the evolution of the chain. The presence of entanglement in the state of the environmental system magnifies the non-Markovian nature of the chain's dynamics, giving rise to structures in figures of merit such as entanglement and purity that are not observed under a separable multi-mode environment. Our analysis can be relevant to problems tackling the open-system dynamics of biological complexes of strong current interest.Comment: 9 pages, 12 figure

Slapping Ideology : an analysis of a new elementary structure of ideology on Instagram

Where is the ideology today? Postmodern time is characterized by uncertainty and this uncertainty also makes uncertain the meaning of ideology. This is because digital communication does not help to understand the real meaning of words. This research offers a contribution to clarify the meaning of ideology within this new technological context. In the explanation of ideological phenomena, the main trouble is based on this historical context, that is, the media power has no interest in promoting a communication built on clarity and values of messages. It tries to persuade people by giving an incorrect representation of the things. The goal of this cultural investigation was reached using two principles: the principle of performative communication and the principle of spectacular communication. The application of the analysis was realized through an exam of Instagram platform, considering its structure and functioning. The analysis is focused especially on the composition of photos and captures of different kinds of users. Are we still able to propose good images? Are we still able to control our digital communication? To sum up, the research wanted to prove that the control of digital communication is possible, without giving up the use of images on Instagram.Onde está a ideologia hoje? Na incerteza que caracteriza o Pós Moderno tornou­se inseguro também o significado de ideologia. Isso aconteceu porque a comunicação digital não nos ajuda a compreender o significado mesmo das palavras. Esta investigação propõe oferecer o contributo para esclarecer e distinguir de maneira precisa o significado da ideologia neste novo contexto tecnológico. A dificuldade principal neste trabalho de esclarecimento do fenômeno ideológico é devido a esta circunstância histórica: o poder midiático não tem interesse em favorecer uma comunicação que clarifique o efectivo sentido e valor das mensagens. A comunicação tenta persuadir para não dar uma correta representação das coisas. Para atingir o objetivo desta investigação cultural, o uso de dois princípios foi fundamental: o princípio da comunicação performativa e o princípio da comunicação espectacular. Ainda somos capazes de oferecer boas imagens? Ainda somos capazes de controlar a comunicação digital? Em resumo, a pesquisa pretendia demonstrar que é possível o controle da comunicação digital, sem ter que renunciar ao uso das imagens no Instagram

Tuning non-Markovianity by spin-dynamics control

We study the interplay between forgetful and memory-keeping evolution enforced on a two-level system by a multi-spin environment whose elements are coupled to local bosonic baths. Contrarily to the expectation that any non-Markovian effect would be buried by the forgetful mechanism induced by the spin-bath coupling, one can actually induce a full Markovian-to-non-Markovian transition of the two-level system's dynamics, controllable by parameters such as the mismatch between the energy of the two-level system and of the spin environment. For a symmetric coupling, the amount of non-Markovianity surprisingly grows with the number of decoherence channels.Comment: 7 pages, 6 figures, PRA versio

Path-dependent equations and viscosity solutions in infinite dimension

Path-dependent PDEs (PPDEs) are natural objects to study when one deals with non Markovian models. Recently, after the introduction of the so-called pathwise (or functional or Dupire) calculus (see [15]), in the case of finite-dimensional underlying space various papers have been devoted to studying the well-posedness of such kind of equations, both from the point of view of regular solutions (see e.g. [15, 9]) and viscosity solutions (see e.g. [16]). In this paper, motivated by the study of models driven by path-dependent stochastic PDEs, we give a first well-posedness result for viscosity solutions of PPDEs when the underlying space is a separable Hilbert space. We also observe that, in contrast with the finite-dimensional case, our well-posedness result, even in the Markovian case, applies to equations which cannot be treated, up to now, with the known theory of viscosity solutions.Comment: To appear in the Annals of Probabilit

Meccanismi per l'invocazione di metodo remoto in Java

La tesi si propone di effettuare uno studio del meccanismo di invocazione di metodo remoto usato dal linguaggio Java, spiegandone i dettagli implementativi a basso livello. In particolare, nel primo capitolo viene presentata l'architettura dell'RMI, nei due capitoli successivi vengono presentate le classi e interfacce dei package java.rmi e sun.rmi, e infine, nel quarto capitolo viene descritta in dettaglio l'interazione tra le varie classi durante l'invocazione di metodo remoto, durante la garbage collection e nel multi-threading delle connessioni

Role of the polygalacturonate network on the iron (III) reduction by caffeic acid

This communication reports the role of polygalacturonate network on the Fe(III) reduction by caffeic acid. The effect of phosphate ions on the redox reaction is also considered

GPGPU for track finding in High Energy Physics

The LHC experiments are designed to detect large amount of physics events produced with a very high rate. Considering the future upgrades, the data acquisition rate will become even higher and new computing paradigms must be adopted for fast data-processing: General Purpose Graphics Processing Units (GPGPU) is a novel approach based on massive parallel computing. The intense computation power provided by Graphics Processing Units (GPU) is expected to reduce the computation time and to speed-up the low-latency applications used for fast decision taking. In particular, this approach could be hence used for high-level triggering in very complex environments, like the typical inner tracking systems of the multi-purpose experiments at LHC, where a large number of charged particle tracks will be produced with the luminosity upgrade. In this article we discuss a track pattern recognition algorithm based on the Hough Transform, where a parallel approach is expected to reduce dramatically the execution time.Comment: 6 pages, 4 figures, proceedings prepared for GPU-HEP 2014 conference, submitted to DESY-PROC-201

Off-Design Propulsion Power Plant Investigations by Means of Free Running Manoeuvring Ship Model Test and Simulation Techniques

Twin screw vessels\u27 propulsion system experiences strong off design conditions during tight manoeuvres due to the propellers inflow asymmetry arising from the coupled yaw-drift motion. Unfortunately, simplified mathematical models based upon statistical data or ad hoc executed captive model test (PMM or CMT) do not provide such a detailed information. Indeed, free running model tests are the best mean in order to get ship\u27s trajectory and kinematics parameters data and propulsion behaviour by recording the loads (thrust and torque) on the shafts. More insight into this complex aspect is desired in order to improve and generalize the application of existing manoeuvring mathematical models for the preliminary design of unconventional propulsive configuration control system

Voice and Video Telephony Services in Smartphone

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Backbone of credit relationships in the Japanese credit market

We detect the backbone of the weighted bipartite network of the Japanese credit market relationships. The backbone is detected by adapting a general method used in the investigation of weighted networks. With this approach we detect a backbone that is statistically validated against a null hypothesis of uniform diversification of loans for banks and firms. Our investigation is done year by year and it covers more than thirty years during the period from 1980 to 2011. We relate some of our findings with economic events that have characterized the Japanese credit market during the last years. The study of the time evolution of the backbone allows us to detect changes occurred in network size, fraction of credit explained, and attributes characterizing the banks and the firms present in the backbone.Comment: 14 pages, 8 figure