Bell scenarios in which nonlocality and entanglement are inversely related

We show that for two-qubit chained Bell inequalities with an arbitrary number of measurement settings, nonlocality and entanglement are not only different properties but are inversely related. Specifically, we analytically prove that in absence of noise, robustness of nonlocality, defined as the maximum fraction of detection events that can be lost such that the remaining ones still do not admit a local model, and concurrence are inversely related for any chained Bell inequality with an arbitrary number of settings. The closer quantum states are to product states, the harder it is to reproduce quantum correlations with local models. We also show that, in presence of noise, nonlocality and entanglement are simultaneously maximized only when the noise level is equal to the maximum level tolerated by the inequality; in any other case, a more nonlocal state is always obtained by reducing the entanglement. In addition, we observed that robustness of nonlocality and concurrence are also inversely related for the Bell scenarios defined by the tight two-qubit three-setting $I_{3322}$ inequality, and the tight two-qutrit inequality $I_3$.Comment: 9 page

Neural network monitoring of resistance welding processes

Control of weld quality is one of the most important and complex processes to be carried out on production lines. Neural networks have shown good results in fields such as modelling and control of physical processes. It is suggested in this article that a neural classifier should be used to carry out non‐destructive on‐line analysis. This system has been developed and installed at resistance welding stations. Results confirm the validity of neural networks used for this type of application

Controlling fragmentation of the acetylene cation in the vacuum ultraviolet via transient molecular alignment

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, los autores pertenecientes a la UAM y el nombre del grupo de colaboración, si lo hubiereAn open-loop control scheme of molecular fragmentation based on transient molecular alignment combined with single-photon ionization induced by a shortwavelength free electron laser (FEL) is demonstrated for the acetylene cation. Photoelectron spectra are recorded, complementing the ion yield measurements, to demonstrate that such control is the consequence of changes in the electronic response with molecular orientation relative to the ionizing field. We show that stable C2H2 + cations are mainly produced when the molecules are parallel or nearly parallel to the FEL polarization, while the hydrogen fragmentation channel (C2H2 + → C2H+ + H) predominates when the molecule is perpendicular to that direction, thus allowing one to distinguish between the two photochemical processes. The experimental findings are supported by state-of-the art theoretical calculationsAn open-loop control scheme of molecular fragmentation based on transient molecular alignment combined with single-photon ionization induced by a shortwavelength free electron laser (FEL) is demonstrated for the acetylene cation. Photoelectron spectra are recorded, complementing the ion yield measurements, to demonstrate that such control is the consequence of changes in the electronic response with molecular orientation relative to the ionizing field. We show that stable C2H2 + cations are mainly produced when the molecules are parallel or nearly parallel to the FEL polarization, while the hydrogen fragmentation channel (C2H2 + → C2H+ + H) predominates when the molecule is perpendicular to that direction, thus allowing one to distinguish between the two photochemical processes. The experimental findings are supported by state-of-the art theoretical calculation

Uso do espaço e atividade de Tapirus terrestris em uma área do Pantanal Sul.

Tapirus terrestris é um dos maiores mamíferos do Neotropico, distribui-se desde Venezuela até Argentina. Esta espécie tem sido estudada em vários dos seus aspectos ecológicos e populacionais, porém, levando em conta sua ampla distribuição, estudos sobre sua área de vida nos diferentes ecossistemas onde ocorre, são ainda limitados. Foi estudado o uso do espaço de três antas na fazenda Nhumirim, Pantanal Sul, Brasil. Duas fêmeas adultas e um macho sub-adulto foram capturados e equipados com colares de telemetria VHF desde julho até novembro de 2009. Foram capturadas duas antas por perseguição e dardejamento e uma usando laço e cavalo. Monitorei as antas por rádio-telemetria, usando um quadriciclo, em diferentes períodos: 07:00-13:00, 13:00-19:00, 19:00-01:00 e de 01:00- 07:00. Cada período foi realizado num dia diferente, ou seja, após quatro dias completei um período circadiano para cada animal. No total obtive 249 localizações das antas, com uma média de quatro pontos/dia. Uma das fêmeas adultas morreu em agosto, apenas 21 dias após a captura e é provável que em conseqüência dela. A segunda fêmea morreu em novembro, 82 dias após a captura, em um período que coincidiu com restrição de água na área de estudo e é possível que sua morte não esteja ligada ao estresse de captura. O macho sub-adulto persistiu por todo o período de estudo e após. As áreas de vida, estimadas pelo Mínimo Polígono Convexo 95% variaram entre 200 a 530 ha. Os tipos de hábitat mais utilizado pelas antas foram cordilheiras (cordão de mata e/ou cerradão) e campos. As antas usaram abrigos diurnos localizados no interior de cordilheiras, geralmente em áreas com abundância da palmeira acuri. A relação entre as antas e cordilheiras mostra a necessidade de conservar as florestas existentes na região.Orientação: Dr. Guilherme de Miranda Mourão

Buildings environmental impact assessment: simulation of textures

To study the construction as modifying of the environment and by so much as aesthetic attribute of the scene should know in what aspect influences. The physical resources of the landscape will be very seemed before and after the incorporation of a project (quality of content). Therefore they will be mainly the new composition of the elements (communicative quality) and the aesthetic resources (quality aesthetics) on those which will influence the constructions. The different points of view election will remain settled with the simulation by infographic photocomposition. The visual and aesthetic aspect of any object is defined by their characteristic of color, form, line and texture. It could be also added any elements of compositive reference as are its scale and being tried to stages, as is the case of the landscape, its spatial character. In this article we will center ourselves in one of these attributes: the texture. The different textures vision is crucial in the communication. The simulation of the landscapte has suffered a great impulse with the treatment of the photograph. This method admits various alternatives. It can be analyzed the taken image of the reality such which, or deducting some of its parts, adding some other element originating from the same or of other scene, or including constructions designed in CAD. The great advance, for the investigation of the visual perception, is procured in the composition using the landscape as fund and a construcion created through a design program attended by ordering. This step supposes great alternatives variability and a rapid generation of the same. Settled the great problem to obtain to compatibilize the points of view of the panorama and of the superposed performance and climinated by photographic treatment the properties of the surfaces that tent to be smooth and metalized brilliants. The reflections and conclusions of the texture emerge with speed. They are analyzed in the study the different simulations with different textures

A higher quantum bound for the V\'ertesi-Bene-Bell-inequality and the role of POVMs regarding its threshold detection efficiency

Recently, V\'{e}rtesi and Bene [Phys. Rev. A. {\bf 82}, 062115 (2010)] derived a two-qubit Bell inequality, $I_{CH3}$, which they show to be maximally violated only when more general positive operator valued measures (POVMs) are used instead of the usual von Neumann measurements. Here we consider a general parametrization for the three-element-POVM involved in the Bell test and obtain a higher quantum bound for the $I_{CH3}$-inequality. With a higher quantum bound for $I_{CH3}$, we investigate if there is an experimental setup that can be used for observing that POVMs give higher violations in Bell tests based on this inequality. We analyze the maximum errors supported by the inequality to identify a source of entangled photons that can be used for the test. Then, we study if POVMs are also relevant in the more realistic case that partially entangled states are used in the experiment. Finally, we investigate which are the required efficiencies of the $I_{CH3}$-inequality, and the type of measurements involved, for closing the detection loophole. We obtain that POVMs allow for the lowest threshold detection efficiency, and that it is comparable to the minimal (in the case of two-qubits) required detection efficiency of the Clauser-Horne-Bell-inequality.Comment: 11 Pages, 16 Figure