Covariance matrices and the separability problem

We propose a unifying approach to the separability problem using covariance matrices of locally measurable observables. From a practical point of view, our approach leads to strong entanglement criteria that allow to detect the entanglement of many bound entangled states in higher dimensions and which are at the same time necessary and sufficient for two qubits. From a fundamental perspective, our approach leads to insights into the relations between several known entanglement criteria -- such as the computable cross norm and local uncertainty criteria -- as well as their limitations.Comment: 4 pages, no figures; v3: final version to appear in PR

On the heating of source of the Orion KL hot core

We present images of the J=10-9 rotational lines of HC3N in the vibrationally excited levels 1v7, 1v6 and 1v5 of the hot core (HC) in Orion KL. The images show that the spatial distribution and the size emission from the 1v7 and 1v5 levels are different. While the J=10-9 1v7 line has a size of 4''x 6'' and peaks 1.1'' NE of the 3 mm continuum peak, the J=10--9 1v5 line emission is unresolved (<3'') and peaks 1.3'' south of the 3 mm peak. This is a clear indication that the HC is composed of condensations with very different temperatures (170 K for the 1v7 peak and $>230$ K for the 1v5 peak). The temperature derived from the 1v7 and 1v5 lines increases with the projected distance to the suspected main heating source I. Projection effects along the line of sight could explain the temperature gradient as produced by source I. However, the large luminosity required for source I, >5 10^5 Lsolar, to explain the 1v5 line suggests that external heating by this source may not dominate the heating of the HC. Simple model calculations of the vibrationally excited emission indicate that the HC can be internally heated by a source with a luminosity of 10^5 Lsolar, located 1.2'' SW of the 1v5 line peak (1.8'' south of source I). We also report the first detection of high-velocity gas from vibrationally excited HC3N emission. Based on excitation arguments we conclude that the main heating source is also driving the molecular outflow. We speculate that all the data presented in this letter and the IR images are consistent with a young massive protostar embedded in an edge-on disk.Comment: 13 pages, 3 figures, To be published in Ap.J. Letter

DSP-SLAM: object oriented SLAM with deep shape priors

We propose DSP-SLAM, an object-oriented SLAM system that builds a rich and accurate joint map of dense 3D models for foreground objects, and sparse landmark points to represent the background. DSP-SLAM takes as input the 3D point cloud reconstructed by a feature-based SLAM system and equips it with the ability to enhance its sparse map with dense reconstructions of detected objects. Objects are detected via semantic instance segmentation, and their shape and pose is estimated using category-specific deep shape embeddings as priors, via a novel second order optimization. Our object-aware bundle adjustment builds a pose-graph to jointly optimize camera poses, object locations and feature points. DSP-SLAM can operate at 10 frames per second on 3 different input modalities: monocular, stereo, or stereo+LiDAR. We demonstrate DSP-SLAM operating at almost frame rate on monocular-RGB sequences from the Freiburg and Redwood-OS datasets, and on stereo+LiDAR sequences on the KITTI odometry dataset showing that it achieves high-quality full object reconstructions, even from partial observations, while maintaining a consistent global map. Our evaluation shows improvements in object pose and shape reconstruction with respect to recent deep prior-based reconstruction methods and reductions in camera tracking drift on the KITTI dataset

Neoteetonics of the eastern border of the Madrid basin

[Abstract] An analysis ofthe neotectonic activity and the current stress state of the eastern border of Madrid Basin has been carried ont using structural-methods (fault population analysis), as well as seismological methods. Two stress tensors have been established: - Tensor 1: with a N1500E shortening trend, characterized mainly by strikeslip faults. This tensor corresponds to the «Guadarrama» stress field (Capote et al., 1990), wihch causes the Central System structure; dated middle Aragonian -lower Pleistocene in the eastern border ofMadrid Basin (Muñoz Martín, 1993). - Tensor 2: dated post-Iower Pleistocene, with a N150° E extension trend, characterized basically by normal faults. Actual stress tensor deduced focal mechanisms by the seismological method is compatible with the paleostress field deduced for the middle-Iower Pleistocene (tensor 2)

Further results on entanglement detection and quantification from the correlation matrix criterion

The correlation matrix (CM) criterion is a recently derived powerful sufficient condition for the presence of entanglement in bipartite quantum states of arbitrary dimensions. It has been shown that it can be stronger than the positive partial transpose (PPT) criterion, as well as the computable cross norm or realignment (CCNR) criterion in different situations. However, it remained as an open question whether there existed sets of states for which the CM criterion could be stronger than both criteria simultaneously. Here, we give an affirmative answer to this question by providing examples of entangled states that scape detection by both the PPT and CCNR criteria whose entanglement is revealed by the CM condition. We also show that the CM can be used to measure the entanglement of pure states and obtain lower bounds for the entanglement measure known as tangle for general (mixed) states.Comment: 13 pages, no figures; added references, minor changes; section 4.3 added, to appear in J. Phys.

Análise multiespectral de medidas de complexidade utilizando o software CompPlexus aplicado a dados do sensor ASTER.

Neste trabalho, será avaliado a eficiência do software CompPlexus na análise multiespectral de complexidade de alvos distintos utilizando bandas do sensor ASTER ? Advanced Spaceborne Thermal Emission and Reflection Radiometer

Simulación por elementos finitos de la articulación temporomandibular

En los últimos años, las patologías asociadas a la articulación temporomandibular (ATM) han cobrado una gran importancia en odontología y patología. Las disfunciones de esta articulación están relacionadas con la inestabilidad mecánica y el movimiento irregular de los componentes biomecánicos que la componen. Dentro de los diferentes elementos que forman esta articulación, es el disco articular la pieza clave dentro de la misma, ya que absorbe las tensiones durante el funcionamiento de la mandíbula, proporciona un adecuado contacto entre las superficies óseas y proporciona estabilidad a la articulación. En este trabajo se desarrollaron dos modelos de elemento finitos bidimensionales de la ATM, uno para una articulación sana y otro para una patológica afectada de un desplazamiento anterior del disco. En ambos modelos de elementos finitos se introdujeron diferentes modelos de comportamiento para simular de manera real el comportamiento del disco articular. Las simulaciones realizadas resultaron ser fieles al comportamiento biomecánico de la ATM real tanto sana como patológica, obteniéndose resultados cualitativos contrastados con la experiencia clínica. Por otro lado, se demostró la necesidad de introducir modelos de comportamiento complejos para simular de manera real el funcionamiento de esta articulación.Peer Reviewe

Criticalidade auto-organizada no cerrado? Invariância escalar dos padrões texturais e espectrais de fitosionomias do cerrado paulista.

Padrões presentes em uma paisagem podem estar associados importantes processos relativos à organização e dinâmica do sistema. Objetivo: O objetivo do presente trabalho foi avaliar, a partir de algumas métricas derivadas do paradigma da complexidade, a complexidade dos padrões texturais e espectrais de fisionomias do Cerrado paulista a fim de verificar quais propriedades relativas à sua organização e dinâmica tais padrões podem revelar. Metodologia: Para tanto, imagens do sensor Aster de três unidades de conservação do estado de São Paulo foram analisadas, utilizando-se dois tipos de medidas (dimensão fractal e medidas baseadas na entropia informacional) para avaliar a complexidade dos padrões texturais e espectrais das fisionomias. Resultados e discussão: Todas as fisionomias, nas três localidades estudadas e para todas as medidas usadas, apresentarem em diversas ocasiões a ocorrência de padrões texturais e espectrais que se repetem em diferentes escalas. A principal implicação desses resultados diz respeito às inferências sobre a dinâmica do Cerrado: a invariância escalar é uma característica marcante de sistemas que se desenvolvem longe do equilíbrio. Mais do que isso, é um grande indicativo de que o sistema pode apresentar criticalidade auto-organizada.Edição especia