442 research outputs found

    The Variation of the Compass for the Year 1960

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    Glimpses of the Work of the Cooperative Hydraulics Laboratory

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    This booklet is presented with the compliments of the California Institute of Technology to those attending the meetings of the Soil Conservation Service held on the campus at Pasadena, February 14 to 19, 1944. Its purpose is two-fold : (i) To acquaint our guests with the Cooperative Hydraulics Laboratory and the work of its staff, and (2) to provide notes on the discussions presented by members of the staff at these meetings

    A NARRADORA NA CONSTRUÇÃO DO FANTÁSTICO EM DOIS CONTOS DE AUGUSTA FARO

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    Resumo: Este artigo pretende discutir a construção do fantĂĄstico contemporĂąneo ou neofantĂĄstico na perspectiva da narradora nos contos “A friagem” e “Check-up”, de Augusta Faro, integrantes da obra A friagem (1999). Para tanto, realiza-se uma breve abordagem de teĂłricos do fantĂĄstico como Todorov (2004), Roas (2014) e do neofantĂĄstico como Alazraki (1991). Objetiva-se, tambĂ©m, examinar a questĂŁo do sujeito da enunciação de acordo com Furtado (1980) e do narrador a partir de Fernandes (1996). Os contos de Faro focalizam o sujeito feminino em situaçÔes limite. Em “A friagem” a personagem central estĂĄ prestes a congelar-se, baldados todos os esforços para debelar o problema. A solução surge com a aparição de Raimundo que reverte a situação. Em “Check-up” a narradora protagonista estĂĄ viva, entretanto seu coração estĂĄ clinicamente seco. ApĂłs configurar-se a presença de narradoras, verifica-se, tambĂ©m, que os contos possibilitam uma leitura alegĂłrica, o que confirma a presença do neofantĂĄstico.Palavras-chave: FantĂĄstico; NeofantĂĄstico; Narradora; “A friagem”; “Check-up”Abstract: This article aims at discussing the construct of contemporary fantastic or neofantastic from the narrator’s perspective in “A friagem” and “Check-up” by Augusta Faro, which integrate the book “A friagem” (1999). A brief approach to fantastic and neofantastic theoreticals such as Tododov (2004), Roas (2014) and Alazraki (1991) is made. Another objective is to examine the subject of enunciation according to Furtado (1980), and the narrator under Fernandes’s viewpoint (1996). Faro’s short stories focus on the female subject on the edge. In “A friagem”, the main character is about to freeze herself, even after all efforts to avoid the situation. The solution appears with Raimundo, who reverts the events. In ‘Check-up”, the narrator and main character is alive, however, her heart is clinically dry. After configuring the female narrators, it is pointed that the short stories allow for the allegorical reading, which confirms the presence of the neofantastic.Keywords: Fantastic; Neofantastic; Narrator; “A friagem”; “Check-up”

    Studying the complexity of change: toward an analytical framework for understanding deliberate social-ecological transformations

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    Faced with numerous seemingly intractable social and environmental challenges, many scholars and practitioners are increasingly interested in understanding how to actively engage and transform the existing systems holding such problems in place. Although a variety of analytical models have emerged in recent years, most emphasize either the social or ecological elements of such transformations rather than their coupled nature. To address this, first we have presented a definition of the core elements of a social-ecological system (SES) that could potentially be altered in a transformation. Second, we drew on insights about transformation from three branches of literature focused on radical change, i.e., social movements, socio-technical transitions, and social innovation, and gave consideration to the similarities and differences with the current studies by resilience scholars. Drawing on these findings, we have proposed a framework that outlines the process and phases of transformative change in an SES. Future research will be able to utilize the framework as a tool for analyzing the alteration of social-ecological feedbacks, identifying critical barriers and leverage points and assessing the outcome of social-ecological transformations

    The background from single electromagnetic subcascades for a stereo system of air Cherenkov telescopes

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    The MAGIC experiment, a very large Imaging Air Cherenkov Telescope (IACT) with sensitivity to low energy (E < 100 GeV) VHE gamma rays, has been operated since 2004. It has been found that the gamma/hadron separation in IACTs becomes much more difficult below 100 GeV [Albert et al 2008] A system of two large telescopes may eventually be triggered by hadronic events containing Cherenkov light from only one electromagnetic subcascade or two gamma subcascades, which are products of the single pi^0 decay. This is a possible reason for the deterioration of the experiment's sensitivity below 100 GeV. In this paper a system of two MAGIC telescopes working in stereoscopic mode is studied using Monte Carlo simulations. The detected images have similar shapes to that of primary gamma-rays and they have small sizes (mainly below 400 photoelectrons (p.e.)) which correspond to an energy of primary gamma-rays below 100 GeV. The background from single or two electromagnetic subcascdes is concentrated at energies below 200 GeV. Finally the number of background events is compared to the number of VHE gamma-ray excess events from the Crab Nebula. The investigated background survives simple cuts for sizes below 250 p.e. and thus the experiment's sensitivity deteriorates at lower energies.Comment: 15 pages, 7 figures, published in Journ.of Phys.

    Discovery of two L & T binaries with wide separations and peculiar photometric properties

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    We present spatially resolved photometric and spectroscopic observations of two wide brown dwarf binaries uncovered by the SIMP near-infrared proper motion survey. The first pair (SIMP J1619275+031350AB) has a separation of 0.691" (15.2 AU) and components T2.5+T4.0, at the cooler end of the ill-understood J-band brightening. The system is unusual in that the earlier-type primary is bluer in J-Ks than the later-type secondary, whereas the reverse is expected for binaries in the late-L to T dwarf range. This remarkable color reversal can possibly be explained by very different cloud properties between the two components. The second pair (SIMP J1501530-013506AB) consists of an L4.5+L5.5 (separation 0.96", 30-47 AU) with a surprisingly large flux ratio (Delta J =1.79 mag) considering the similar spectral types of its components. The large flux ratio could be explained if the primary is itself an equal-luminosity binary, which would make it one of the first known triple brown dwarf systems. Adaptive optics observations could not confirm this hypothesis, but it remains a likely one, which may be verified by high-resolution near-infrared spectroscopy. These two systems add to the handful of known brown dwarf binaries amenable to resolved spectroscopy without the aid of adaptive optics and constitute prime targets to test brown dwarf atmosphere models.Comment: accepted for publication in Ap

    On key technologies for realising digital twins for structural dynamics applications

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    The term digital twin has gained increasing popularity over the last few years. The concept, loosely based on a virtual model framework that can replicate a particular system for contexts of interest over time, will require the development and integration of several key technologies in order to be fully realised. This paper, focusing on vibration-related problems in mechanical systems, discusses these key technologies as the building blocks of a digital twin. The example of a simulation digital twin that can be used for asset management is then considered. After briefly discussing the building blocks required, the process of data-augmented modelling is selected for detailed investigation. This concept is one of the defining characteristics of the digital twin idea, and using a simple numerical example, it is shown how augmenting a model with data can be used to compensate for the inherent model discrepancy. Finally the implications of this type of data augmentation for future digital twin technology is discussed

    The ultracool-field dwarf luminosity-function and space density from the Canada-France Brown Dwarf Survey

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    Context. Thanks to recent and ongoing large scale surveys, hundreds of brown dwarfs have been discovered in the last decade. The Canada-France Brown Dwarf Survey is a wide-field survey for cool brown dwarfs conducted with the MegaCam camera on the Canada-France-Hawaii Telescope telescope. Aims. Our objectives are to find ultracool brown dwarfs and to constrain the field brown-dwarf luminosity function and the mass function from a large and homogeneous sample of L and T dwarfs. Methods. We identify candidates in CFHT/MegaCam i' and z' images and follow them up with pointed near infrared (NIR) imaging on several telescopes. Halfway through our survey we found ~50 T dwarfs and ~170 L or ultra cool M dwarfs drawn from a larger sample of 1400 candidates with typical ultracool dwarfs i' - z' colours, found in 780 square degrees. Results. We have currently completed the NIR follow-up on a large part of the survey for all candidates from mid-L dwarfs down to the latest T dwarfs known with utracool dwarfs' colours. This allows us to draw on a complete and well defined sample of 102 ultracool dwarfs to investigate the luminosity function and space density of field dwarfs. Conclusions. We found the density of late L5 to T0 dwarfs to be 2.0pm0.8 x 10-3 objects pc-3, the density of T0.5 to T5.5 dwarfs to be 1.4pm0.3 x 10-3 objects pc-3, and the density of T6 to T8 dwarfs to be 5.3pm3.1 x 10-3 objects pc-3 . We found that these results agree better with a flat substellar mass function. Three latest dwarfs at the boundary between T and Y dwarfs give the high density 8.3p9.0m5.1 x 10-3 objects pc-3. Although the uncertainties are very large this suggests that many brown dwarfs should be found in this late spectral type range, as expected from the cooling of brown dwarfs, whatever their mass, down to very low temperature.Comment: Accepted for publication in A&

    KL Estimation of the Power Spectrum Parameters from the Angular Distribution of Galaxies in Early SDSS Data

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    We present measurements of parameters of the 3-dimensional power spectrum of galaxy clustering from 222 square degrees of early imaging data in the Sloan Digital Sky Survey. The projected galaxy distribution on the sky is expanded over a set of Karhunen-Loeve eigenfunctions, which optimize the signal-to-noise ratio in our analysis. A maximum likelihood analysis is used to estimate parameters that set the shape and amplitude of the 3-dimensional power spectrum. Our best estimates are Gamma=0.188 +/- 0.04 and sigma_8L = 0.915 +/- 0.06 (statistical errors only), for a flat Universe with a cosmological constant. We demonstrate that our measurements contain signal from scales at or beyond the peak of the 3D power spectrum. We discuss how the results scale with systematic uncertainties, like the radial selection function. We find that the central values satisfy the analytically estimated scaling relation. We have also explored the effects of evolutionary corrections, various truncations of the KL basis, seeing, sample size and limiting magnitude. We find that the impact of most of these uncertainties stay within the 2-sigma uncertainties of our fiducial result.Comment: Fig 1 postscript problem correcte
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