Identification of a high-velocity compact nebular filament 2.2 arcsec south of the Galactic Centre

The central parsec of the Milky Way is a very special region of our Galaxy; it contains the supermassive black hole associated with Sgr A* as well as a significant number of early-type stars and a complex structure of streamers of neutral and ionized gas, within two parsecs from the centre, representing a unique laboratory. We report the identification of a high velocity compact nebular filament 2.2 arcsec south of Sgr A*. The structure extends over ~1 arcsec and presents a strong velocity gradient of ~200 km s^{-1} arcsec^{-1}. The peak of maximum emission, seen in [Fe III] and He I lines, is located at d{\alpha} = +0.20 +/- 0.06 arcsec and d{\delta} = -2.20 +/- 0.06 arcsec with respect to Sgr A*. This position is near the star IRS 33N. The velocity at the emission peak is Vr = -267 km s^{-1}. The filament has a position angle of PA = 115{\degr} +/- 10{\degr}, similar to that of the Bar and of the Eastern Arm at that position. The peak position is located 0.7 arcsec north of the binary X-ray and radio transient CXOGX J174540.0-290031, a low-mass X-ray binary with an orbital period of 7.9 hr. The [Fe III] line emission is strong in the filament and its vicinity. These lines are probably produced by shock heating but we cannot exclude some X-ray photoionization from the low-mass X-ray binary. Although we cannot rule out the idea of a compact nebular jet, we interpret this filament as a possible shock between the Northern and the Eastern Arm or between the Northern Arm and the mini-spiral "Bar".Comment: 7 pages, 4 figures, published online in MNRA

Topological strong field physics on sub-laser cycle time scale

Sub-laser cycle time scale of electronic response to strong laser fields enables attosecond dynamical imaging in atoms, molecules and solids. Optical tunneling and high harmonic generation are the hallmarks of attosecond imaging in optical domain, including imaging of phase transitions in solids. Topological phase transition yields a state of matter intimately linked with electron dynamics, as manifested via the chiral edge currents in topological insulators. Does topological state of matter leave its mark on optical tunneling and sub-cycle electronic response? We identify distinct topological effects on the directionality and the attosecond timing of currents arising during electron injection into conduction bands. We show that electrons tunnel across the band gap differently in trivial and topological phases, for the same band structure, and identify the key role of the Berry curvature in this process. These effects map onto topologically-dependent attosecond delays in high harmonic emission and the helicities of the emitted harmonics, which can record the phase diagram of the system and its topological invariants. Thus, the topological state of the system controls its attosecond, highly non-equilibrium electronic response to strong low-frequency laser fields, in bulk. Our findings create new roadmaps in studies of topological systems, building on ubiquitous properties of sub-laser cycle strong field response - a unique mark of attosecond science

Grid-Brick Event Processing Framework in GEPS

Experiments like ATLAS at LHC involve a scale of computing and data management that greatly exceeds the capability of existing systems, making it necessary to resort to Grid-based Parallel Event Processing Systems (GEPS). Traditional Grid systems concentrate the data in central data servers which have to be accessed by many nodes each time an analysis or processing job starts. These systems require very powerful central data servers and make little use of the distributed disk space that is available in commodity computers. The Grid-Brick system, which is described in this paper, follows a different approach. The data storage is split among all grid nodes having each one a piece of the whole information. Users submit queries and the system will distribute the tasks through all the nodes and retrieve the result, merging them together in the Job Submit Server. The main advantage of using this system is the huge scalability it provides, while its biggest disadvantage appears in the case of failure of one of the nodes. A workaround for this problem involves data replication or backup.Comment: 6 pages; document for CHEP'03 conferenc

Convergence of numerical schemes for short wave long wave interaction equations

We consider the numerical approximation of a system of partial differential equations involving a nonlinear Schr\"odinger equation coupled with a hyperbolic conservation law. This system arises in models for the interaction of short and long waves. Using the compensated compactness method, we prove convergence of approximate solutions generated by semi-discrete finite volume type methods towards the unique entropy solution of the Cauchy problem. Some numerical examples are presented.Comment: 31 pages, 7 figure

Avaliação do risco cardiovascular numa população da zona Norte do País

As doenças cardiovasculares lideram as causas de mortalidade no mundo e em Portugal. Alguns dos fatores de risco (FR) associados são sexo masculino, idade avançada, hipertensão arterial, hipercolesteremia, tabagismo, obesidade e sedentarismo, cuja sinergia amplifica o risco cardiovascular. Realizou-se um rastreio em indivíduos da região norte de Portugal, com o objetivo de determinar, pela tabela derivada do projeto SCORE, o Risco Cardiovascular Absoluto e o Risco Cardiovascular Relativo e Risco Cardiovascular Absoluto Projetado aos 60 anos. Verificou-se a presença de vários FR na amostra em estudo. A avaliação do risco permite estimar a interação de FR individuais, fundamentando a definição de estratégias interventivas, com potenciais ganhos em saúde.Cardiovascular diseases are a major cause of mortality in the world and Portugal. Most common associated risk factors (RF) are male gender, advanced age, hypertension, hypercholesterolemia, smoking, obesity and sedentary habits, whose interaction increases the cardiovascular risk. We conducted a screening in individuals from Northern Portugal, in order to determine the Absolute and Relative Cardiovascular Risks and 60 years old Risk Projection through the table derived from the SCORE project. We observed the presence of various FR in the sample. The cardiovascular risk assessment allows estimating the interaction of individual RF, enabling the definition of an intervention, with potential gains in health

ENERGY POLICIES FOR BRAZILIAN HOTELS - IMPLEMENTATION'S PRELUDE

The first relevant steps to raise energy efficiency in Brazilian buildings were done just in the last decade and the National Program for Buildings' Energy Labeling is working since 2009 as an optional certification for residential, institutional and commercial buildings. Throughout the current startup phase, some requirements of such methodology are pointed as insufficient or permissive. Considering the strong increase of hosting infrastructure which is taking place in Brazil due to recent great international events, it is relevant that such building typology presents high potential of energy savings. Several simulated scenarios fed the analysis of the energy labeling methodology, and main findings regard a critical perception of this public policy

"Quaestio definitionis et nominis latinis idem". Lenguaje y conocimiento en el De antiquissima de Vico

Este ensayo discute el lugar del lenguaje, y su intrincada relación con el problema del conocimiento, en el De antiquissima. Proponiéndose investigar en el latín antiguo y vulgar una metafísica Itálica, nuestro autor terminaría por recolocar el problema moderno y racionalista al respecto del origen de nuestras ideas según los términos clásicos y aristotélicos del problema del significado de los símbolos. En vez de admitir la existencia de las cosas, a las cuales cabría al pensamiento aprender y al lenguaje comunicar, Vico piensa en esos elementos según otra disposición, conforme la orden propia desde el punto de vista del Autor de las cosas: Dios dice las cosas que piensa y esas, entonces, son creadas.This essay discusses the place of language, and its intricate relationship with the problem of knowledge, in De antiquissima. Aiming to produce a vulgar Italic metaphysics in the ancien latin, our author would end up relocating the modern and rationalistic problem about the origin of our ideas in the classic and Aristotelian terms about the meaning of symbols. Instead of admitting the existence of things, which could be grasped by thought and communicated by language, Vico thinks those elements according to a different disposition, according to their own order from the point of view of the Author of things: God says the things that he thinks and those, then, are created