A model for large-scale volcanic plumes on Io: Implications for eruption rates and interactions between magmas and near-surface volatiles.

Volcanic plumes deposit magmatic pyroclasts and SO2 frost on the surface of Io. We model the plume activity detected by Galileo at the Pillan and Pele sites from 1996 to 1997 assuming that magmatic eruptions incorporate liquid SO2 from near-surface aquifers intersecting the conduit system and that the SO2 eventually forms a solid condensate on the ground. The temperature and pressure at which deposition of solid SO2 commences in the Ionian environment and the radial distance from the volcanic vent at which this process appears to occur on the surface are used together with observed vertical heights of plumes to constrain eruption conditions. The temperature, pressure, and density of the gas–magma mixtures are related to distance from the vent using continuity and conservation of energy. Similar eruption mass fluxes of order 5x10^7 kg s^1 are found for both the Pillan and the Pele plumes. The Pele plume requires a larger amount of incorporated SO2 (29–34 mass %) than the Pillan plume (up to 6 mass%). Implied vent diameters range from c. 90m at Pillan to c. 500 m at Pele. The radial extents of the optically dense, isothermal, incandescent parts of the eruption plumes immediately above the vents are 100 m at Pillan and 1300 m at Pele. Gas pressures in the vents are 20 kPa at Pillan and 2 kPa at Pele and the eruption conditions appear to be supersonic in both cases, though only just so at Pele

Laicity (secularism) and its enemies

La laicidad representa un principio importante para la consolidación de un Estado de derecho y la ilustración de la ciudadanía. No obstante, a pesar y debido a su importancia, sufre constante ataques por parte de distintas fuerzas sociales y políticas. En este artículo, el autor identifica cuatro enemigos de la laicidad: el clericalismo, los fundamentalismos religiosos, el comunitarismo y el laicismo. El objetivo consiste no sólo en denunciar esos enemigos sino también en proporcionar argumentos contra sus ataques al principio de laicidad.Laicity (or secularism) embodies an important principle for the rule of law and the enlightenment of the citizenship. Nonetheless, and because of this relevance, different social and political forces constantly criticize it. In this article, the author identifies four enemies: clericalism, religious fundamentalisms, communitarianism, and laicism. The aim is not only to denounce those enemies but also to provide some arguments against their attacks to the principle of laicity.Este trabajo forma parte del proyecto “Professor Visitante do Exterior” (PVE) de la CAPES, en colaboración con la PUC-Rio (Pós-graduação em Direito / Núcleo de Direitos Humanos). Integra también el proyecto de investigación “Secularización, Laicidad y Libertad de Conciencia” -CSO2011-14850-E. El autor quiere agradecer el apoyo de la Fundación Gregorio Peces-Barba para el Estudio & Cooperación en Derechos Humanos

Una aproximación al concepto de dignidad humana

Publicad

Models of the dignity of human being throughout the Middle Ages

En este trabajo, se pretende demostrar la existencia de un discurso sobre la dignidad del ser humano a lo largo de toda la Edad Media. Este discurso será más desarrollado en el Renacimiento con, en particular, los tratados sobre la “dignitas hominis”. Sin embargo, a partir del medioevo y ya en la Alta Edad Media, empiezan a configurarse unos planteamientos que permiten hablar de distintos modelos de la dignidad del ser humano. Se puede así defender la existencia de un humanismo medieval que, basándose en una nueva interpretación de las fuentes bíblicas y en otras fuentes de la filosofía clásica, argumenta a favor de una dignidad inherente al ser humano. Esta defensa de la dignidad del hombre tiene como principal motivo, complementar y también criticar otras posturas que sostienen la miseria del ser humano.This article aims to show the existence of a discourse on the dignity of human being throughout the Middle Ages. This discourse will be more developed during the Renaissance, with in particular the treaties upon the “dignitas hominis”. However, from the Middle and even in the High Middle Ages, began to take shape different approaches that create various models of the dignity of human being. Thus, a medieval humanism based on a new interpretation of the biblical sources and other sources of the classical philosophy, defends an inherent dignity of all human beings. This defense of the dignity of man aims to supplement and criticize other positions that claim the misery of human beings.Publicad

Information entropy and measures of market risk

In this paper we investigate the relationship between the information entropy of the distribution of intraday returns and intraday and daily measures of market risk. Using data on the EUR/JPY exchange rate, we find a negative relationship between entropy and intraday Value-at-Risk, and also between entropy and intraday Expected Shortfall. This relationship is then used to forecast daily Value-at-Risk, using the entropy of the distribution of intraday returns as a predictor

Local matching indicators for transport problems with concave costs

In this paper, we introduce a class of indicators that enable to compute efficiently optimal transport plans associated to arbitrary distributions of N demands and M supplies in R in the case where the cost function is concave. The computational cost of these indicators is small and independent of N. A hierarchical use of them enables to obtain an efficient algorithm

Some considerations on investment projects valuation

The classical criteria for investment projects valuation, although easy to apply, have the disadvantage of not reflecting the complexity of the social and economic phenomena implied by these projects. This study emphasizes some aspects that should be carefully taken into account in the valuation process of investment projects. Hence, the assessment of the discount rate, the estimation of future earnings and the quantification of social benefits are analysed.direct investments, discount rate, estimated earnings, social benefits, financing.

Na pele

TCC (graduação) - Universidade Federal de Santa Catarina. Centro de Comunicação e Expressão. Jornalismo.Em 2013, a PM-SC realizou um concurso para soldado que teve grande repercussão por causa de reprovações absurdas, entre elas pessoas que tinham tatuagens, mesmo que elas ficassem escondidas pela farda. Na pele é um documentário que conta a história de Felipe Amalfi, advogado que passou por isso. Em paralelo, outros tatuados que seguem carreiras tradicionais falam sobre motivações pessoais e preconceitos, enquanto tatuadores falam mais sobre a arte

TESTING MARKET EFFICIENCY VIA DECOMPOSITION OF STOCK RETURN. APPLICATION TO ROMANIAN CAPITAL MARKET

In this paper we are investigating the market efficiency using a model which decomposes the stock return into two components: a stochastic trend and a white noise component. This model is tested for the Romanian Capital Market, considering the time series of BET (Bucharest Exchange Trade) Index. The conclusion is that for our data sample we cannot reject the efficient market hypothesis for Romanian Capital Market. Classificaefficient market hypothesis, random walk, stochastic trend, ARIMA models, Romanian Capital Market, BET.tion-JEL: C42, G14