1,896 research outputs found

    Is J 133658.3-295105 a Radio Source at z >= 1.0 or at the Distance of M 83?

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    We present Gemini optical imaging and spectroscopy of the radio source J 133658.3-295105. This source has been suggested to be the core of an FR II radio source with two detected lobes. J 133658.3-295105 and its lobes are aligned with the optical nucleus of M 83 and with three other radio sources at the M 83 bulge outer region. These radio sources are neither supernova remnants nor H II regions. This curious configuration prompted us to try to determine the distance to J 133658.3-295105. We detected H_alpha emission redshifted by ~ 130 km s^-1 with respect to an M 83 H II region 2.5" east-southeast of the radio source. We do not detect other redshifted emission lines of an optical counterpart down to m_i = 22.2 +/- 0.8. Two different scenarios are proposed: the radio source is at z >= 2.5, a much larger distance than the previously proposed lower limit z >= 1.0, or the object was ejected by a gravitational recoil event from the M 83 nucleus. This nucleus is undergoing a strong dynamical evolution, judging from previous three-dimensional spectroscopy.Comment: 6 pages, 4 figure

    The continuous star formation history of a giant HII region in M101

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    We present results about the star formation process in the giant HII region NGC 5471 in the outskirts of M101. From resolved HST/WPFC2 photometry we find that star formation has been going for the last 70 Myr. We further compare previous results from integrated infrared-optical photometry with the stellar resolved CMD and we discuss the star formation properties of this region and its individual knots, as well as characterizing the different stellar content. This result has very important consequences in our understanding of the burst versus continuous star formation activity in spiral galaxies.Comment: 2 pages, 2 figures. Proceeding of the conference From Stars to Galaxies: Building the pieces to build up the Universe (Venice, Italy

    Impact of self determination theory amongst individuals with autism spectrum disorder and physical activity: modifying a survey

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    Prior research has expressed concern for individuals with autism spectrum disorder (ASD), who may be at risk regarding exercise and physical activity due to lack of interest, delays in motor skill development, and/or social impairment. Self Determination theory (SDT) has been suggested as an effective approach for supporting individuals with ASD across a variety of domains. SDT expresses that with the satisfaction of three fundamental psychological needs (autonomy, competence, and relatedness), higher levels of intrinsic motivation will develop which will lead to enhanced development and well-being. While SDT is an effective approach to promoting motivation, it has been suggested that appropriate support be integrated for this population. Evidence-based practices consist of appropriate strategies that aim to support individuals with ASD and produce positive outcomes. The purpose of this literature is to identify how SDT impacts the success of individuals with ASD through the implementation of autonomy, relatedness, and competence within multiple settings

    Background of Technical Specifications forSubstation Equipment exceeding 800 kV AC

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    In 2008, CIGRÉ WG A3.22 published Technical Brochure 362: ?Technical Requirements for Substation Equipment exceeding 800 kV AC?. A second TB is now available which further develops the background information and, where appropriate, presents recommendations for the international specification and standardization of UHV equipment. As the studies ofWG A3.22 are based on only a few examples of UHV projects, some subtle modifications to earlier conclusions and recommendations are incorporated in this document however these are bothminor and limited. Such refinements will, doubtless, continue as service experience with UHV systems increases. Indeed, since January 6th, 2009, in China, a single circuit 1100 kV overhead line systemwith three substations has been in full operation and this is sure to provide valuable data over the coming years. Based on the information available to date the following key areas have been addressed by WG A3.22.Fil: Diaz, Ricardo Ruben. Universidad Nacional de Tucumán. Facultad de Ciencias Exactas y Tecnología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentin

    A sample of Seyfert-2 galaxies with ultra-luminous galaxy-wide NLRs -- Quasar light echos?

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    We report the discovery of Seyfert-2 galaxies in SDSS-DR8 with galaxy-wide, ultra-luminous narrow-line regions (NLRs) at redshifts z=0.2-0.6. With a space density of 4.4 per cubic Gpc at z~0.3, these "Green Beans" (GBs) are amongst the rarest objects in the Universe. We are witnessing an exceptional and/or short-lived phenomenon in the life cycle of AGN. The main focus of this paper is on a detailed analysis of the GB prototype galaxy J2240-0927 (z=0.326). Its NLR extends over 26x44 kpc and is surrounded by an extended narrow-line region (ENLR). With a total [OIII]5008 luminosity of (5.7+/-0.9)x10e43 erg/s, this is one of the most luminous NLR known around any type-2 galaxy. Using VLT/XSHOOTER we show that the NLR is powered by an AGN, and we derive resolved extinction, density and ionization maps. Gas kinematics is disturbed on a global scale, and high velocity outflows are absent or faint. This NLR is unlike any other NLR or extended emission line region (EELR) known. Spectroscopy with Gemini/GMOS reveals extended, high luminosity [OIII] emission also in other GBs. WISE 24micron luminosities are 5-50 times lower than predicted by the [OIII] fluxes, suggesting that the NLRs reflect earlier, very active quasar states that have strongly subsided in less than a galaxies' light crossing time. These light echos are about 100 times more luminous than any other such light echo known to date. X-ray data are needed for photo-ionization modeling and to verify the light echos.Comment: This is an update of our previous submission (1211.7098). Apart from layout it is identical to the publication in ApJ. Compared to v1 (1211.7098) type settings and language errors have been corrected. We also added 4 more redshifts, confirming 3 sources (objects #002, #017, #21) and rejecting one (#020, low-z HII region

    Diseño de filtros planares para radiometría

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    Diseño de tres prototipos de filtros para apliaciones de radiometría (LICEF) -Filtro microstrip de orden 6, con dos ceros de transmisión. Síntesis de filtros sin pérdidas. -Filtro microstrip asíncrono de orden 6, con un cero de transmisión. Síntesis de filtros sin pérdidas -Filtro microstrip de orden 6 , con dos ceros de transmisión. Síntesis por técnicas avanzadas de filtros con pérdidas. Procedimiento: -Anális de resonadores sobre diferentes dieléctricos -Síntesis a partir de matriz de acoplamientos -Simulación con ADS -Simulación con Momentum -Comparación de prototipo

    TELEOPERATED SYSTEM WITH ACCELEROMETERS FOR DISABILITY

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    This project involves the implementation of a teleoperated arm using an embedded platform based on a reconfigurable logic device (FPGA) configured and programmed in VHDL for Atmega 328p, using servomotors MG996R brand and a communication terminal with accelerometers, scheduled language C. the system is incompatible with teleoperated robotic autonomy (understood as the case where control and decision making are performed by the robot itself). That is why robots are teleoperated tasks perception of the environment, complex manipulation that are performed by humans and planning, ie, the operator acts in real time closed loop control high level. The evolved systems provide sensory feedback to the operator environment (strength, distance). In this manipulation we used an anthropomorphic arm with automatic controllers that replicate the movements of the operator

    The Spatial Orientation of Planetary Nebulae Within the Milky Way

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    We analyze the spatial orientation of a homogenous sample of 440 elongated Planetary Nebulae (PNe) in order to determine the orientation of their apparent major axis respect to the Milky Way plane. We present some important geometrical and statistical considerations that have been overlooked by the previous works on the subject. The global distribution of galactic position angles (GPA) of PNe is quantitatively not very different from a random distribution of orientations in the Galaxy. Nevertheless we find that there is at least one region on the sky, toward the galactic center, where a weak correlation may exist between the orientation of the major axis of some PNe and the Galactic equator, with an excess of axes with GPA∼100∘\sim 100^{\circ}. Therefore, we confirm that ``extrinsic'' phenomena (i.e., global galactic magnetic fields, shell compression from motion relative to the Interstellar Medium) do not determine the morphology of PNe on most of the sky, with a possible exception towards the galactic center.Comment: 37 pages and 8 figures. Accepted for publication in PAS
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