1,383 research outputs found
Inflated Beta Distributions
This paper considers the issue of modeling fractional data observed in the
interval [0,1), (0,1] or [0,1]. Mixed continuous-discrete distributions are
proposed. The beta distribution is used to describe the continuous component of
the model since its density can have quite diferent shapes depending on the
values of the two parameters that index the distribution. Properties of the
proposed distributions are examined. Also, maximum likelihood and method of
moments estimation is discussed. Finally, practical applications that employ
real data are presented.Comment: 15 pages, 4 figures. Submitted to Statistical Paper
Radial velocities and metallicities from infrared Ca II triplet spectroscopy of open clusters II. Berkeley 23, King 1, NGC 559, NGC 6603 and NGC 7245
Context: Open clusters are key to studying the formation and evolution of the
Galactic disc. However, there is a deficiency of radial velocity and chemical
abundance determinations for open clusters in the literature. Aims: We intend
to increase the number of determinations of radial velocities and metallicities
from spectroscopy for open clusters. Methods: We acquired medium-resolution
spectra (R~8000) in the infrared region Ca II triplet lines (~8500 AA) for
several stars in five open clusters with the long-slit IDS spectrograph on the
2.5~m Isaac Newton Telescope (Roque de los Muchachos Observatory, Spain).
Radial velocities were obtained by cross-correlation fitting techniques. The
relationships available in the literature between the strength of infrared Ca
II lines and metallicity were also used to derive the metallicity for each
cluster. Results: We obtain = 48.6+/-3.4, -58.4+/-6.8, 26.0+/-4.3 and
-65.3+/-3.2 km s-1 for Berkeley 23, NGC 559, NGC 6603 and NGC 7245,
respectively. We found [Fe/H] =-0.25+/-0.14 and -0.15+/-0.18 for NGC 559 and
NGC 7245, respectively. Berkeley 23 has a low metallicity, [Fe/H]
=-0.42+/-0.13, similar to other open clusters in the outskirts of the Galactic
disc. In contrast, we derived a high metallicity ([Fe/H] =+0.43+/-0.15) for NGC
6603, which places this system among the most metal rich known open clusters.
To our knowledge, this is the first determination of radial velocities and
metallicities from spectroscopy for these clusters, except NGC 6603, for which
radial velocities had been previously determined. We have also analysed ten
stars in the line of sight to King 1. Because of the large dispersion obtained
in both radial velocity and metallicity, we cannot be sure that we have sampled
true cluster members.Comment: 10 pages, 5 figures, accepted for publication in A&A (minor
modifications
Pinworms of the red howler monkey (Alouatta seniculus) in Colombia. Gathering the pieces of the pinworm-primate puzzle
Pinworms of primates are believed to be highly host specific parasites, forming co-evolutionary associations with their hosts. In order to assess the strength and reach of such evolutionary links, we need to have a broad understanding of the pinworm diversity associated with primates. Here, we employed an integrative taxonomic approach to assess pinworm diversity in red howler monkeys in Colombia. Molecular and morphological evidence validate the presence of at least four different species of Trypanoxyuris occurring in red howler monkeys: T. minutus, a widely distributed species, and three new species, T. seunimiii n. sp., T. kemuimae n. sp. and T. kotudoi n. sp. The mitochondrial COI gene and the 28S ribosomal gene were used for phylogenetic assessments through Bayesian inference. The three new species were morphologically distinct and formed reciprocally monophyletic lineages. Further molecular lineage subdivision in T. minutus and T. kotudoi n. sp. without morphological correspondence, suggests the potential scenario for the existence of cryptic species. Phylogenetic relationships imply that the different species of Trypanoxyuris occurring in each howler monkey species were acquired through independent colonization events. On-going efforts to uncover pinworm diversity will allow us to test the degree of host specificity and the co-phylogenetic hypothesis, as well as to further unravel the primate-pinworm evolutionary history puzzle
Recommended from our members
Centrolene savagei
Number of Pages: 11Geological SciencesIntegrative Biolog
Estimating networks of sustainable development goals
An increasing number of researchers and practitioners advocate for a systemic understanding of the Sustainable Development Goals (SDGs) through interdependency networks. Ironically, the burgeoning network-estimation literature seems neglected by this community. We provide an introduction to the most suitable estimation methods for SDG networks. Building a dataset with 87 development indicators in four countries over 20 years, we perform a comparative study of these methods. We find important differences in the estimated network structures as well as in synergies and trade-offs between SDGs. Finally, we provide some guidelines on the potentials and limitations of estimating SDG networks for policy advice
II Workshop on Modeling and Simulation for Science and Engineering
II Workshop on Modeling and Simulation for Science and Engineering (II WMSSE) was a conference
conducted at Universidad Tecnológica de BolÃvar, in the city of Cartagena de Indias, Colombia, on
September 24, 25 and 26, 2019. There, works in several topics of science, technology and engineering
were presented. Specially, the participants of conference wanted to bring some solutions to the actual
industrial requirements such as improvement and optimization of the heat transfer equipment, electronic
devices, system control by mean of computational modeling. Also, dynamic system control was widely
used for the prediction of power flow market, diffusion of bacteria in coffee production, stress
concentration in industrial machines, analysis of population dynamics, model of hydrological and
pluviometric networks, encryption for intercommunication of substation control centers, and others
Situación adidáctica en entornos informáticos sobre sistema de numeración decimal
Esta conferencia recoge alguno de los avances del trabajo de grado que se viene
adelantando como prerrequisito para optar por el tÃtulo de Licenciatura en Educación Básica con
énfasis en Matemáticas de la Universidad de Valle, donde se propone un diseño,
implementación, análisis y evaluación de una secuencia didáctica mediante una serie de
actividades en Geogebra, que conducen a la apropiación, por parte del estudiante, del concepto
de sistema de numeración decimal. De esta manera propiciar al estudiante una situación de
aprendizaje didáctica y darle la oportunidad de construir sus propios conocimientos del
concepto referente al sistema de numeración decimal, mediante el análisis, la exploración, y una
gestión didáctica. Además, que el estudiante pueda mediante la experimentación con las
matemáticas, visualizar conceptos abstractos mediante una constante conexión conceptual con
el nuevo concepto asimilado y los conocimientos previos
- …