39,979 research outputs found
A summary of the endemic beetle genera of the West Indies (Insecta: Coleoptera); bioindicators of the evolutionary richness of this Neotropical archipelago
The Caribbean Islands (or the West Indies) are recognized as one of the leading global biodiversity hot
spots. This is based on data on species, genus, and family diversity for vascular plants and non-marine vertebrates. This
paper presents data on genus level endemicity for the most speciose (but less well publicised) group of terrestrial
animals: the beetles, with 205 genera (in 25 families) now recognized as being endemic (restricted) to the West Indies.
The predominant families with endemic genera are Cerambycidae (41), Chrysomelidae (28), Curculionidae (26), and
Staphylinidae (25). This high level of beetle generic endemicity can be extrapolated to suggest that a total of about
700 genera of all insects could be endemic to the West Indies. This far surpasses the total of 269 endemic genera of all
plants and non-marine vertebrates, and reinforces the biodiversity richness of the insect fauna of the West Indies.Las islas del Caribe (o Indias Occidentales) son reconocidas como uno de los principales hotspots de la
biodiversidad global. Esto se basa en datos sobre la diversidad de especies, géneros y familias de plantas vasculares y
vertebrados no-marinos. Este trabajo presenta datos sobre la endemicidad a nivel genérico para el más especioso (pero
menos popularizado) grupo de animales terrestres: los escarabajos, con 205 géneros (en 25 familias) reconocidos al
presente como endémicos (restringidos) a las Indias Occidentales. Las familias predominantes en géneros endémicos
son Cerambycidae (41), Chrysomelidae (28), Curculionidae (26) y Staphylinidae (25). Este alto nivel de endemicidad
genérica en los escarabajos puede extrapolarse a sugerir que alrededor de 700 géneros pudieran ser endémicos entre
todos los insectos de las Indias Occidentales. Esto sobrepasa ampliamente el total de 269 géneros endémicos de
plantas y vertebrados no-marinos y refuerza la riqueza en biodiversidad de la fauna de insectos en las Indias Occidentales
Physics at high Q^2 and p^2_t: Summary of DIS 2000
We summarize the experimental and theoretical results presented in the
"Physics at the Highest Q^2 and p^2_t" working group at the DIS 2000 Workshop.
High Q^2 and p^2_t processes measured at current and future colliders allow to
improve our knowledge of Standard Model (SM) physics, by providing precise
measurements of the SM parameters and, consequently, consistency checks of the
SM. Moreover, they give information on key quantities for the calculation of
the SM expectations in a yet unexplored domain, such as the parton densities of
the proton or the photon. In addition to these experimental inputs,
higher-order calculations are also needed to obtain precise expectations for SM
processes, which are a key ingredient for the searches for new phenomena in
high Q^2 and p^2_t processes at current and future experiments. The
experimental and theoretical status of SM physics at high Q^2 and p^2_t is
reviewed in the first part of this summary, with the remaining being dedicated
to physics beyond the Standard Model.Comment: 17 pages, 10 figures. Typos correcte
Cohomological Finiteness Conditions in Bredon Cohomology
We show that any soluble group of type Bredon-\FP_{\infty} with respect
to the family of all virtually cyclic subgroups such that centralizers of
infinite order elements are of type \FP_{\infty} must be virtually cyclic. To
prove this, we first reduce the problem to the case of polycyclic groups and
then we show that a polycyclic-by-finite group with finitely many conjugacy
classes of maximal virtually cyclic subgroups is virtually cyclic. Finally we
discuss refinements of this result: we only impose the property Bredon-\FP_n
for some and restrict to abelian-by-nilpotent, abelian-by-polycyclic
or (nilpotent of class 2)-by-abelian groups.Comment: Corrected a mistake in Lemma 2.4 of the previous version, which had
an effect on the results in Section 5 (the condition that all centralisers of
infinite order elements are of type was added
Can’t get you out of my mind: Empathy, Distress, and Recurring Thoughts about a Person in Need
Research suggests that empathic concern and distress give rise to different patterns of helping behavior. It has been proposed that this difference is caused by the effects of these emotions on recurrent thoughts about the person in need. However, no research has directly investigated this potential explanation. To remedy this, we tested the hypotheses that distress, but not empathic concern, is associated with both anticipated recurring thoughts (Study 1) and experienced recurring thoughts (Study 2) about a victim. We also tested the hypothesis that distress is associated with thoughts about the victim, whereas empathic concern is associated with thoughts about the victim’s situation (Study 3), which is potentially a consequence of the motives associated with each emotion. Lastly, we assessed the causal relations between distress, empathic concern, and recurrent thoughts (Study 4). Overall, results demonstrate a distinctive, and important, pattern of associations among empathic concern, distress, and different forms of recurrent thoughts about an emotion-eliciting stimulus
Lavoura de arroz integrada à pecuária de corte: resultados do primeiro ano de trabalhos na Embrapa Pecuária Sul.
bitstream/item/55819/1/DT92.pd
Exact Matrix Product States for Quantum Hall Wave Functions
We show that the model wave functions used to describe the fractional quantum
Hall effect have exact representations as matrix product states (MPS). These
MPS can be implemented numerically in the orbital basis of both finite and
infinite cylinders, which provides an efficient way of calculating arbitrary
observables. We extend this approach to the charged excitations and numerically
compute their Berry phases. Finally, we present an algorithm for numerically
computing the real-space entanglement spectrum starting from an arbitrary
orbital basis MPS, which allows us to study the scaling properties of the
real-space entanglement spectra on infinite cylinders. The real-space
entanglement spectrum obeys a scaling form dictated by the edge conformal field
theory, allowing us to accurately extract the two entanglement velocities of
the Moore-Read state. In contrast, the orbital space spectrum is observed to
scale according to a complex set of power laws that rule out a similar
collapse.Comment: 10 pages and Appendix, v3 published versio
Sedimentology and paleontology of the lower member of the Nogueras Fm (Lower Devonian) at Santa Cruz de Nogueras (Teruel, NE Spain)
An integrated sedimentological and paleontological analysis has been canted out in the lower member (d2a) of the shallow-marine Nogueras Formation (Lower Devonian, Iberian Chains). This formation represents the first carbonate-dominated and fossil-rich sedimentary unit of the Devonian of the Iberian Chains. Nine sedimentary facies, including terrigenous-clastic, mixed and carbonate facies, which are complexly intercalated at bed scale, have been characterized. Based on their sedimentary features and their lateral relationships using Markov chain analysis, two sedimentary models for the lower and upper part of d2a member have been proposed, which represent deposition in a mixed elastic-carbonate shallow marine depositional system. They include terrigenous-clastic intertidal deposits and predominant skeletal, carbonate-dominated and grain-supported facies in the high-energy shallow subtidal zone, whith a clear zonation of the skeletal components (brachiopods, bryozoans and crinoids, from shallow to relatively deep areas). Phosphate nodules, phosphatized fossils, ferruginous crusts and iron ooids, which are frequently associated with the relatively shallower bioclastic brachiopod facies, were probably linked to mineral continental sources and to remobilization in the shallow water high-energy area. The paleontological analysis shows that some of those organisms lived in protected areas of the subtidal zone, including in particular high-diversity communities of brachiopods, adapted to turbid waters with fine terrigenous suspended sediments.
Se ha realizado un análisis sedimentológico y paleontológico integrado del miembro inferior (d2a) de la Formación Nogueras, que representa la primera unidad marina somera predominantemente carbonatada del Devónico de las Cadenas Ibéricas. Se han definido nueve facies sedimentarias tcrrígeno-clás ticas, mixtas y carbonatadas, que están complejamente intercaladas a escala de capa, depositadas en un sistema mixto de- trítico-carbonatado de aguas someras. En Junción de sus rasgos sedimentarios y del análisis de sus relaciones laterales mediante cadenas de Markov, se proponen dos modelos sedimentarios para la parte inferior y superior del miembro estudiado. Los dos modelos incluyen depósitos terrígenos en la zona intermareal y facies carbonatadas bioclásticas en la zona submareal somera, con una clara zonación de sus componentes esqueléticos dominantes (braquiópodos, briozoos, crinoides, desde la zona somera a la relativamente profunda). Los nodulos de fosfato, fósiles fósfatizados, costras y ooides ferruginosas frecuentes en las facies bioclasticas de braquiópodos relativamente someras, se relacionaron probablemente con aportes minerales desde el continente y retrabajamiento en la zona marina de alta energía. El análisis paleontológico muestra que algunos de estos organismos vivían en áreas protegidas de la zona submareal, incluyendo particularmente comunidades con alta diversidad de braquiópodos, adaptadas a aguas turbias con elevado sedimento terrígeno fino en suspensión
The Line Emission Region in III Zw 2: Kinematics and Variability
We have studied the Ly-al, Hbeta, Halpha and Mg II2798 line profiles of the
Seyfert 1 galaxy III Zw 2. The shapes of these broad emission lines show
evidence of a multicomponent origin and also features which may be identified
as the peaks due to a rotating disk. We have proposed a two-component Broad
Line Region (BLR) model consisting of an inner Keplerian relativistic disk and
an outer structure surrounding the disk. The results of the fitting of the four
Broad Emission Lines (BELs) here considered, are highly consistent in both the
inner and outer component parameters. Adopting a mass of approx. 2 E8 sollar
masses for the central object we found that the outer radius of the disk is
approximately equal for the four considered lines (approx 0.01 pc). However,
the inner radius of the disk is not the same: 0.0018 pc for Ly-alpha, 0.0027 pc
for Mg II, and 0.0038 pc for the Balmer lines. This as well as the relatively
broad component present in the blue wings of the narrow [OIII] lines indicate
stratification in the emission-line region. Using long-term Hbeta observations
(1972-1990, 1998) we found a flux variation of the BEL with respect to the
[OIII] lines.Comment: ApJ, accepted, 22 pages, 10 figure
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