Journal articles on the topic 'Eclipse Lyo'

AbstractHard X-ray light curves and spectral parameters from our analysis of X-ray data of five AM Her type systems – V2301 Oph, V1432 Aql, EP Draconis, GG Leonis, & V834 Cen, and one intermediate polar – TV Col, observed using the Rossi X — ray Timing Explorer (RXTE) satellite are presented. A new improved ephemeris has been derived for V2301 Oph using the mid-eclipse timings. Average intensity variations, without any change of shape of the light curve or hardness ratio, are observed on timescales of a few days to a few months in V2301 Oph. V1432 Aql shows erratic variations on a timescale of a day, at least two sharp dips near orbital phases 0.35 and 0.5, and a total eclipse. Hard X-ray eclipses are also reported in EP Dra and GG Leo. V834 Cen shows intensity variations on yearly timescale and is found to be in a low state in 2002. In TV Col, a binary orbital modulation at 5.5h, in addition to the spin period of 1910s, is reported for the first time. Maximum spectral temperatures in Polars have been determined and used to estimate the masses of the white dwarfs.

A wide range of imported ornamental sunflower seeds have been marketed in Indonesia. A field evaluation was conducted on seven sunflower cultivars to investigate their germination, growth and development in humid tropical environment in Bogor, West Java, Indonesia and to determine their potential uses. Most of the tested cultivars, except for ‘Sungold Double’ and ‘Velvet Queen’, demonstrated good germination and growth. ‘Eclipse’ was highly susceptible to stem rot, which resulted in only 30% of the plants survived. ‘Little Leo’, ‘Teddy Bear’ and ‘Sungold Double’ were naturally compact, dwarf, and produced attractive blooms so they might be suitable as pot plants. ‘Hallo’, ‘Velvet Queen’, ‘Sunburst’, and ‘Eclipse’s plant height were more than 100 cm, had long stem and large blooms. These cultivars might be suitable as landscape plants.Keywords: morphological characteristics, West Java, pot plants

Purpose This study aims to predict the types of thermally induced dynamics (TID) that can occur on deployable solar panels of a small form factor satellite, CubeSat which flies in low Earth orbit (LEO). The TID effect on the CubeSat body is examined. Design/methodology/approach A 3U CubeSat with four short-edge deployable solar panels is considered. Time historic temperature of the solar panels throughout the orbit is obtained using a thermal analysis software. The results are used in numerical simulation to find the structural response of the solar panel. Subsequently, the effect of solar panel motion on pointing the direction of the satellite is examined using inertia relief method. Findings The thermal snap motion could occur during eclipse transitions due to rapid temperature changes in solar panels’ cross-sections. In the case of asymmetric solar panel configuration, noticeable displacement in the pointing direction can be observed during the eclipse transitions. Research limitations/implications This work only examines an LEO mission where the solar cells of the solar panels point to the Sun throughout the daylight period and point to the Earth while in shadow. Simplification is made to the CubeSat structure and some parameters in the space environment. Practical implications The results from this work reveal several practical applications worthy of simplifying the study of TID on satellite appendages. Originality/value This work presents a computational method that fully uses finite element software to analyze TID phenomenon that can occur in LEO on a CubeSat which has commonly used deployable solar panels structure.

AbstractBackground and purpose: This study examined the effect of varying the X–Y smoothing values on the average Leaf Pair Opening (LPO), MUFactor and total number of monitor units (MU) in a cohort of 20 prostate and head and neck (H&N) patients treated with dynamic intensity-modulated radiotherapy (IMRT).Material and methods: Plans were created using Varian Eclipse™ Treatment Planning System (TPS) version 8.9.09 (Varian Medical Systems, Palo Alto, CA). Clinically approved and dosimetrically verified plans were used as a reference plans. These were re-optimised varying the X and Y smoothing parameters from 0 to 100 in various combinations.Results: For the prostate patients, at X = 0 and Y = 0, the average LPO was 2.4 cm (σ = 0.20 cm) and 3.5 cm (σ = 0.35 cm) for X = 100 and Y = 100. For H&N, the LPO averaged over all fields increased from 1.7 cm (σ = 0.17 cm) at X = 0 and Y = 0 to 2.3 cm (σ = 0.27 cm) at X = 100 and Y = 90. The MUFactor decreased from 1.81 (σ = 0.19) at X = 0 and Y = 0 to 1.38 (σ = 0.11) at X = 100 and Y = 100 for prostates and from 1.50 (σ = 0.14) at X = 0 and Y = 0 to 1.24 (σ = 0.09) for X = 100 and Y = 90 for H&N. Total MU for prostates decreased from 1028.0 (σ = 244.6) at X = 0 and Y = 0 to 688.4 (σ = 159.3) at X = 100 and Y = 100 and from 913 (σ = 267.2) at X = 0 and Y = 0 to 696 (σ = 214.03) at X = 100 and Y = 90 for H&N.Conclusions: Increasing smoothing decreases MUFactor, decreases total MU and increases average LPO but does not greatly enhance organs at risk (OAR) sparing. The Homogeneity Index (HI) and Paddick Conformity Index (CIPAD) appear to vary little after increasing smoothing up to approximately X = 80 and Y = 70.

AbstractMultiwavelength observations of polars are essential for developing the big picture of these systems, particularly to gain understanding of the relevant accretion-induced heating and cooling processes. Eclipsing polars are prime targets for such studies since different radiation processes can be disentangled by observations with high-time resolution. We present a preliminary combined analysis of space-based observations (XMM-Newton, ROSAT, HST) with ground-based high-speed photometry (MCCP, OPTIMA, ULTRACAM) of DP Leo, HU Aqr and UZ For. We determine the location and extent of different emission components and find secular and short-term changes in the accretion geometries. We find displaced optical and X-ray emission regions in DP Leo and HU Aqr as well as mini-bursts and accretion arcs of variable size in HU Aqr. We report marked changes in the X-ray eclipse length of UZ For between high and low states.

The philosophic correspondence between Leo Strauss and Eric Voegelin, stretching over thirty years, sheds some helpful light on each of the thinkers’ philosophic positions. To be sure, only a few of the letters seem truly significant, and it would of course be a mistake to allow the rather informal and ad hoc remarks in any of the letters to eclipse either theorist's considered and matured published reflections. Moreover, the correspondence peters out in the mid-fifties, after which each thinker arguably made important modifications in his respective outlook. But the letters, or at least the most significant, do not seem careless; the principal issues addressed go to the very heart of things; and if the letters are interpreted with careful attention to the contemporary published, as well as some unpublished, writings, then, it seems to me, the engagement between the two theorists does indeed clarify some of the more obscure but weighty premises and implications of the two philosophic positions.

In this paper, we introduce a computational procedure that enables autonomous LEO laser trackers endowed with INSs to increase the current accuracy when shooting at middle distant medium-size LEO debris targets. The code is designed for the trackers to throw the targets into the atmosphere by means of ablations. In case that the targets are eclipsed to the trackers by the Earth, the motions of the trackers and targets are modeled by equations that contain post-Newtonian terms accounting for the curvature of space. Otherwise, when the approaching targets become visible for the trackers, we additionally use more accurate equations, which allow to account for the local bending of the laser beams aimed at the targets. We observe that under certain circumstances the correct shooting configurations that allow to safely and efficiently shoot down the targets, differ from the current estimations by distances that may be larger than the size of many targets. In short, this procedure enables to estimate the optimal shooting instants for any middle distant medium-size LEO debris target.

AbstractTime-resolved photometry and spectroscopy of cataclysmic variables (CV) are powerful tools for clarifying the physical size, placement, and conditions of emission regions in these compact systems. We present HST time resolved UV spectroscopic data for one self-eclipsing mCV system, ST LMi, and two secondary eclipsing systems, DP Leo and UZ For. These observations clearly show the relative contributions of three emission components: the white dwarf, a hotter region surrounding the accretion shock, and the photoionized accretion stream. UZ For was observed in an unusually active state by both HST and EUVE. These data provide strong evidence that the accretion stream is “clumpy”, with overdensities 100–1000 times the average density. Using photoionization codes such as XSTAR and CLOUDY, we find that steady, supersonic, and homogenous flow in the UZ For accretion stream is unstable to compression heating. As a consequence, we propose a two-phase model for the stream and obtain density enhancements comparable to those deduced from the strengths of the UV emission lines and EUVE absorption features. Similar behavior may be expected from active, asynchronous magnetic CVs with coupling radii greater than several white dwarf radii.

AbstractUp to now, more than 500 extra-solar planets have been discovered. Many of these extrasolar systems consist of one star and only one giant planet. However, recently more and more different types of systems have become known, including also extrasolar planets in binaries. In our study, we will concentrate on such systems, since a large percentage of all G-M stars are expected to be part of binary or multiple stellar systems. Therefore, these kinds of systems are worthy of investigation in detail. In particular, we will concentrate on planets in P-Type motion, where the planet orbits around both stars. During the last few years, four such systems (NN Ser, HW Vir, HU Aqr and DP Leo) have been discovered. In our study, we performed dynamical studies for three multi-planetary systems in binaries (NN Ser, HW Vir, HU Aqr), and compared simulated eclipse timing variations (ETV) to current observational data.

Objective: The present study focuses on the antioxidant mediated protective effect of a popular medicinal herbEcliptaalba against CCl4induced oxidative stress in the liver of rats.Methods: Rats divided into four groups were administered with CCl4 andCCl4 along with methanol extract of leaves of Eclipta herb (200 and 400 mg/kg b. wt) for three weeks. At the end of treatment, rats were anaesthetized and blood samples were collected for serum separation. Biochemical analysis such as alanineaminotransferase (ALT), aspartateaminotransferase (AST), alkaline phosphatase (ALP), lactate dehydrogenase (LDH) and total bilirubin (TB) were done in serum. Liver tissue was used for glutathione (GSH), lipid peroxidation (LPO), gluatathione peroxidase (GPx), glutathione Stransferase (GST), superoxide dismutase (SOD)and catalase (CAT) analysis. CCl4 administration caused significant elevation of the serum enzymes and total bilirubin content.Results: Antioxidant enzymes were drastically inhibited with significant reduction of glutathione and increased lipid peroxidation in CCl4 treated rats. Ecliptaalbaextracts administrated rats, however did not show much changes in marker enzyme level. Antioxidant enzyme status was also not affected and found nearer to the control levels. Increased gluatathione level and reduced lipid peroxidation was also evident in Eclipta alba treated rats.Conclusion: The findings show that Eclipta alba extract offers better protection against the free radical toxicity of CCl4.

Abstract We present the discovery of TYC9191-519-1b (TOI-150b, TIC 271893367) and HD271181b (TOI-163b, TIC 179317684), two hot Jupiters initially detected using 30-min cadence Transiting Exoplanet Survey Satellite (TESS) photometry from Sector 1 and thoroughly characterized through follow-up photometry (CHAT, Hazelwood, LCO/CTIO, El Sauce, TRAPPIST-S), high-resolution spectroscopy (FEROS, CORALIE), and speckle imaging (Gemini/DSSI), confirming the planetary nature of the two signals. A simultaneous joint fit of photometry and radial velocity using a new fitting package juliet reveals that TOI-150b is a $1.254\pm 0.016\ \rm {R}_ \rm{J}$, massive ($2.61^{+0.19}_{-0.12}\ \rm {M}_ \rm{J}$) hot Jupiter in a 5.857-d orbit, while TOI-163b is an inflated ($R_ \rm{P}$ = $1.478^{+0.022}_{-0.029} \,\mathrm{ R}_ \rm{J}$, $M_ \rm{P}$ = $1.219\pm 0.11 \, \rm{M}_ \rm{J}$) hot Jupiter on a P = 4.231-d orbit; both planets orbit F-type stars. A particularly interesting result is that TOI-150b shows an eccentric orbit ($e=0.262^{+0.045}_{-0.037}$), which is quite uncommon among hot Jupiters. We estimate that this is consistent, however, with the circularization time-scale, which is slightly larger than the age of the system. These two hot Jupiters are both prime candidates for further characterization – in particular, both are excellent candidates for determining spin-orbit alignments via the Rossiter–McLaughlin (RM) effect and for characterizing atmospheric thermal structures using secondary eclipse observations considering they are both located closely to the James Webb Space Telescope (JWST) Continuous Viewing Zone (CVZ).

Resumo: Como entender o desenvolvimento teórico e as mudanças históricosociais que impulsionaram a recuperação e alteração da teoria marxiana no século XX e como esta ainda se encontra atuante sobre nosso horizonte social contemporâneo? Fazendo uso da reconstrução crítica de Habermas, a recuperação se inicia com Weber, a passagem por Lukács e na recepção horkheimeriana-adorniana, que tanto influenciou a crítica social do século XX, o presente artigo busca apresentar uma possibilidade de leitura. Palavras-chave: Teoria crítica. Reificação. Marx. Habermas. Modernidade. Abstract: How can we understand the theoretical development and all the socialhistorical changes which drove the incoming recovery and the further alteration of the Marxian theory in the twentieth century and how is it still possible to assumes it on our contemporary societies? Recovering Habermas’s critical reconstruction, which starts with Weber, the next step over Lukács, and the Horkheimerian-Adornian theoretical reception, which has largely influenced twentieth social critic, the aim paper intents to show up a possible reading. Keywords: Critical theory. Reification. Marx. Habermas. Modernity. REFERÊNCIAS ARAUTO, A. “Lukács’ Theory of Reification”. In: Telos, n. 11, 1972. ARGÜELLO, K. O Ícaro da Modernidade: Direito e Política em Max Weber. São Paulo: Acadêmica, 1997. BERNSTEIN, R. J. Habermas and Modernity. Cambridge, Massachusetts: The MIT Press, 1991. BRAATEN, J. Habermas’s Critical Theory of Society. Albany: State University of New York Press, 1991. COUTINHO, C. N. Lukács: A Ontologia e a Política. In: ANTUNES, R. & RÊGO, W. L. (orgs.). Lukács: Um Galileu no Século XX. São Paulo: Boitempo Editorial, 1996. GIDDENS, A. “Reason without Revolution? Habermas’s Theorie des Kommunikativen Handelns”. In :BERNSTEIN, R. J. Habermas and Modernity. Cambridge, Massaschusetts : The MIT Press, 1991. HABERMAS, J. “Does Philosophy still have a Purpose?”. In: HABERMAS, J. Philosophical-Political Profiles. Cambridge, Massachusetts: The MIT Press, 1983. HABERMAS, J. The Theory of Communicative Action, Volume I: Reason and the Rationalization of Society. Boston: Beacon Press, 1984. HABERMAS, J. Técnica e Ciência como “Ideologia”. São Paulo: Unesp, 2014. HONNETH, A. The Critique of Power: Reflective Stages in a Critical Social Theory. Cambridge: The MIT Press, 1997. HORKHEIMER, M. Eclipse da Razão. São Paulo: Centauro Editora, 2002. HORKHEIMER, M. Teoria Tradicional e Teoria Crítica. São Paulo: Abril Cultural, 1975. HORKHEIMER, M.; ADORNO, T. W. Dialética do Esclarecimento. Rio de Janeiro: Jorge Zahar Editor, 2006. LEO MAAR, W. “A Reificação como Realidade Social: Práxis, Trabalho e Crítica Imanente em HCC”. In: ANTUNES, R. & RÊGO, W. L. (orgs). Lukács: Um Galileu no século XX. São Paulo: Boitempo Editorial, 1996. LUKÁCS, G. História e Consciência de Classe: Estudos sobre a Dialética Marxista. São Paulo: WMF Martins Fontes, 2016.MARX, K. A Ideologia Alemã. São Paulo: Boitempo Editorial, 2007. MARX, K. Grundrisse: Manuscritos Econômicos de 1857-1858 & Esboços da Crítica da Economia Política. São Paulo: Boitempo Editorial, 2011. MELO, R. Marx e Habermas: Teoria Crítica e os Sentidos de Emancipação. São Paulo: Editora Saraiva, 2013. MENEZES, A. B. N. T. Habermas e a Modernidade: Uma “Metacrítica da Razão Instrumental”. Natal: EDUFRN, 2009. NETTO, J. P. “Lukács e o Marxismo Ocidental”. In: ANTUNES, R. & RÊGO, W. L. (orgs.). Lukács: Um Galileu no Século XX. São Paulo: Boitempo Editorial, 1996. NOBRE, M. A Dialética Negativa de Theodor W. Adorno: A Ontologia do Estado Falso. São Paulo: Iluminuras/FAPESP, 1998. NOBRE, M. A Teoria Crítica. Rio de Janeiro: Zahar Editor, 2004. PINZANI, A. Habermas: Introdução. São Paulo: Artmed, 2004. REPA, L. A Transformação da Filosofia em Jürgen Habermas: Os Papéis de Reconstrução, Interpretação e Crítica. São Paulo: Editora Singular, 2008. TEIXEIRA, M. Razão e Reificação: Um Estudo sobre Max Weber em “História e Consciência de Classe” de Georg Lukács. Campinas: Unicamp, Dissertação de mestrado, in mimeo, 2010. WELLMER, A. “Reason, Utopia, and the Dialectic of Enlightenment”. In: BERNSTEIN, R. J. Habermas and Modernity. Cambridge, Massachusetts: The MIT Press, 1991.

The theoretical substrate in this text is to reflect, based on the foundations of the Critical Theory of Society, about the semiformation (Halbbildung) in a multiscreen society, and mediated by new technologies. In particular, our intention is to think about the impacts on the formative process in the midst of the current scenario marked by the massification of technique and the brutalization of thought keeping at bay critical thinking. Cultural formation or formative experience has conformed to the frameworks of late capitalism and technical progress which, in fact, are commanded by technological rationality, thus favoring the flowering of semiformation. The methodology, of a bibliographical nature, grounds our reflection in M. Horkheimer and T. W. Adorno, thinkers of the first generation of the Frankfurt School, and secondary readings. The focus of our research is centered on the new technologies of this "multiscreen society", which easily surrenders to the tutelage of instrumental reason and drifts into semiformation. One possible way out is in formation and in a culture (Bildung) capable of a critical self-reflection about the semiformation which it has become. The ethical challenge posed is the need of a theoretical-practical reflection from a human standpoint against this state of barbarism, in favor of the human being, autonomous, free, subject.ResumoO substrato teórico, nesse texto, é refletir, urdidos pelos fundamentos da Teoria Crítica da Sociedade, acerca da semiformação (Halbbildung) na “sociedade multitela”, mediada pelas novas tecnologias. De modo particular, analisar sobre o processo formativo em meio ao cenário atual, marcado pela massificação da técnica e pelo embrutecimento do pensar crítico, afastando o pensamento crítico no que tange a formação humana e ética. A formação cultural ou a experiência formativa tem se conformado aos marcos do capitalismo tardio e do progresso técnico, que, de fato, são comandados pela racionalidade tecnológica, favorecendo, desse modo, o florescimento da semiformação. A metodologia, de cunho bibliográfico, ancora nossa reflexão em M. Horkheimer e T. W. Adorno, pensadores da primeira geração da Escola de Frankfurt, e de leituras secundárias. O foco de nossa pesquisa centra-se nas novas tecnologias desta “sociedade multitela”, que facilmente se entrega à tutela da razão instrumental e descamba na semiformação. Como resultado, uma possível saída está na formação e numa cultura (Bildung) capaz de uma autorreflexão crítica sobre a semiformação em que se converteu. O desafio ético posto é a necessidade da reflexão teórico-prática enquanto tomada de posição humana contra esse estado de barbárie, em favor do próprio ser humano, autônomo, livre, sujeito.Resumen El sustrato teórico, en este texto, es el de reflexionar, urdidos por los fundamentos de la Teoría Crítica de la Sociedad, acerca de la semiformación (Halbbildung) en la "sociedad multitela", mediada por las nuevas tecnologías. De modo particular, nuestro propósito es el pensar sobre los impactos en el proceso formativo en medio del escenario actual marcado por la masificación de la técnica y el embrutecimiento del pensar, alejando el pensamiento crítico. La formación cultural o la experiencia formativa se han conformado a los marcos del capitalismo tardío y del progreso técnico que, de hecho, son comandados por la racionalidad tecnológica, favoreciendo así el florecimiento de la semiformación. La metodología, de cuño bibliográfico, ancla nuestra reflexión en M. Horkheimer y T. Adorno, pensadores de la primera generación de la Escuela de Francfort, y de lecturas secundarias. El foco de nuestra investigación se centra en las nuevas tecnologías de esta "sociedad multitela", que fácilmente se entrega a la tutela de la razón instrumental y descama en la semiformación. Una posible salida está en la formación, y en una cultura (Bildung) capaz de una autorreflexión crítica sobre la semiformación en que se ha convertido. El desafío ético puesto es la necesidad de la reflexión teórico-práctica en cuanto toma de posición humana contra ese estado de barbarie, en favor del propio ser humano, autónomo, libre, sujeto.Palavras-chave: Semiformação, Tecnologia, Ética, Teoria Crítica.Keywords: Semiformation, Technology, Ethics, Critical Theory.Palabras clave: Semiformación, Tecnología, Ética, Teoría Crítica.ReferencesADORNO, T. W. Mínima Moralia. Tradução de Luiz Eduardo Bicca. São Paulo: Ática, 1992a.ADORNO, T. W. Quatro textos básicos. 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