Volatility Surface and Skewness in Live Cattle Futures Price Distributions with Application to North American BSE Announcements

options markets, live cattle, volatility, pricing density function, Financial Economics, Livestock Production/Industries, Risk and Uncertainty,

Depression: The role of the self-concept

Neste artigo defende-se que a natureza da depress50 n5o pode ser compreendida sem fazer referhcia ao auto-conceito e ao papel central que ocupa no desencadear e manutenclo da desordem. Existem viirias abordagens do Se@ a psicanalitica e a cognitiva ocupam lugar especial no caso da depresslo. Neste artigo, procura-se identificar pontos de convergencia entre estas abordagens. Slo igualmente apresentados, de mod0 sumiirio, alguns antecedentes historicos por forma a melhor compreender o context0 do desenvolvimento de perspectivas mais recentes.ABSTRACT: In this paper it argued that the nature of depression cannot be understood without reference to the selfconcept and the central part that it plays in the onset and maintenance of the disorder. There have of course been a wide range of approaches to the self; the psychoanalytic and cognitive approaches are of particular relevance to depression and therefore some attempt are made to identify possible points of integration between these different approaches which are normally considered to be disparate. A brief summary of some of the historical antecedents also is provided in order to set the context in which more recent approaches have been developed

Scaling laws for electron kinetic effects in tokamak scrape-off layer plasmas

Tokamak edge (scrape-off layer) plasmas can exhibit non-local transport in the direction parallel to the magnetic field due to steep temperature gradients. This effect along with its consequences has been explored at equilibrium for a range of conditions, from sheath-limited to detached, using the 1D kinetic electron code SOL-KiT, where the electrons are treated kinetically and compared to a self-consistent fluid model. Line-averaged suppression of the kinetic heat flux (compared to Spitzer-Harm) of up to 50% is observed, contrasting with up to 98% enhancement of the sheath heat transmission coefficient, $\gamma_e$. Simple scaling laws in terms of basic SOL parameters for both effects are presented. By implementing these scalings as corrections to the fluid model, we find good agreement with the kinetic model for target electron temperatures. It is found that the strongest kinetic effects in $\gamma_e$ are observed at low-intermediate collisionalities, and tend to increase at increasing upstream densities and temperatures. On the other hand, the heat flux suppression is found to increase monotonically as upstream collisionality decreases. The conditions simulated encompass collisionalities relevant to current and future tokamaks.Comment: 24 pages, 14 figure

Raciocínio dedutivo na depressão

É descrito um estudo desenhado pelos autores no intuito de investigar o raciocínio na depressão. A tarefa de raciocínio utilizada consiste em silogismos lineares que incorporam informação com valência emocional relevante para o se% quer nas premissas quer na conclusão. A tarefa foi dada a amostras de estudantes que foram avaliados nos seus níveis de ansiedade e depressão.ABSTRACT: A studie is described which investigates reasoning in depression. A linear syllogism reasoning task was utilized which incorporated emotionally valent information relevant to the self in both the premisses and the conclusion. The task was given to samples of students who were also assessed for their levels of anxiety and depression

Perspectivas cognitivas da depressão: Critica teórica

Inexistent

Occurrence of Lake Chub, Couesius plumbeus, in Northern Labrador

Lake Chub (Couesius plumbeus) were recently found in seven previously undocumented locations in northern Labrador. These populations represent the first recorded accounts of this species in the Labrador region north of the Churchill River drainage and east of the George River. Lake Chub likely invaded this region via dispersal routes provided by eastern spillways of glacial Lake Naskaupi

Confronting cold dark matter predictions with observed galaxy rotations

The rich statistics of galaxy rotations as captured by the velocity function (VF) provide invaluable constraints on galactic baryon physics and the nature of dark matter (DM). However, the comparison of observed galaxy rotations against cosmological models is prone to subtle caveats that can easily lead to misinterpretations. Our analysis reveals full statistical consistency between similar to 5000 galaxy rotations, observed in line-of-sight projection, and predictions based on the standard cosmological model (Lambda CDM) at the mass-resolution of the Millennium simulation (H I line-based circular velocities above similar to 50 km s(-1)). Explicitly, the H I linewidths in the H I Parkes All Sky Survey (HIPASS) are found to be consistent with those in S-3-SAX, a post-processed semi-analytic model for the Millennium simulation. Previously found anomalies in the VF can be plausibly attributed to (1) the mass-limit of the Millennium simulation, (2) confused sources in HIPASS, (3) inaccurate inclination measurements for optically faint sources, and (4) the non-detectability of gas-poor early-type galaxies. These issues can be bypassed by comparing observations and models using linewidth source counts rather than VFs. We investigate if and how well such source counts can constrain the temperature of DM

Evolution of realized Eltonian niches across Rajidae species

The notion that closely related species resemble each other in ecological niche space (i.e., phylogenetic dependence) has been a long-standing, contentious paradigm in evolutionary biology, the incidence of which is important for predicting the ecosystem-level effects of species loss. Despite being examined across a multitude of terrestrial taxa, many aspects of niche conservatism have yet to be explored in marine species, especially for characteristics related to resource use and trophic behavior (Eltonian niche characteristics, ENCs). We combined ENCs derived from stable isotope ratios at assemblage- and species-levels with phylogenetic comparative methods, to test the hypotheses that benthic marine fishes (1) exhibit similar assemblage-wide ENCs regardless of geographic location and (2) display phylogenetically dependent ENCs at the species level. We used a 12-species sub-set of the monophyletic group Rajidae sampled from three independent assemblages (Central California, Gulf of Alaska, and Northwest Atlantic), which span two ocean basins. Assemblage-level ENCs implied low trophic diversity and high evenness, suggesting that Rajidae assemblages may exhibit a well-defined trophic role, a trend consistent regardless of geographic location. At the species level, we found evidence for phylogenetic dependence of ENCs relating to trophic diversity (i.e., isotopic niche width; SEAc). Whether individuals can be considered functional equivalents across assemblages is hard to ascertain because we did not detect a significant phylogenetic signal for ENCs relating to trophic function (e.g., trophic position). Thus, additional, complimentary approaches are required to further examine the phylogenetic dependence of species functionality. Our approach illustrates the potential of stable isotope-derived niche characteristics to provide insight on macroecological processes occurring across evolutionary time, which could help predict how assemblages may respond to the effects of species loss