48 research outputs found
Utilização de Hortas Orgânicas Como Ferramenta Para Educação Ambiental
Resumo: Hortas orgânicas constituem um modo de produção de alimentos sustentável que respeita o meio ambiente e a saúde humana. Trata-se de uma importante ferramenta para se trabalhar educação ambiental com diferentes faixas etárias. A educação ambiental não se resume a um conceito, mas a um processo que envolve a formação de um cidadão justo, consciente com os recursos que utiliza e responsável por suas ações. O objetivo deste trabalho foi de ensinar o modelo orgânico de produção de hortaliças, assim como a importância deste sistema de produção. A metodologia empregada neste trabalho consistiu em visitas na horta orgânica da Unespar, campus de Paranavaí, para conhecer as etapas para a construção de uma horta, aplicação de questionários e construção de pequenas hortas nas escolas de Paranavaí e região. Durante a visita e a construção das hortas discutiu-se a metodologia de produção de alimentos com a redução de lixo principalmente orgânico, o conceito de segurança alimentar, evidenciado pela qualidade do alimento produzido nas hortas orgânicas, que são livres de toxinas e a educação ambiental. O projeto proporcionou o suporte necessário tanto de materiais como técnico para que as hortas pudessem ser construídas e mantidas. A execução deste trabalho foi importante para contribuir com a formação de cidadãos responsáveis com o meio ambiente onde estão inseridos. Disseminou a construção de novas hortas orgânicas nas escolas e foi um instrumento para educação ambiental. Os alunos cuidam do espaço da horta na escola e relatam que foi um estímulo para construção das hortas em suas casas. As hortas orgânicas produzem mais que alimentos, elas são um modelo para que novas hortas sejam construídas
Morphological Transformations of Galaxies in the A901/02 Supercluster from STAGES
We present a study of galaxies in the Abell 901/902 Supercluster at z~0.165,
based on HST ACS F606W, COMBO-17, Spitzer 24um, XMM-Newton X-ray, and
gravitational lensing maps, as part of the STAGES survey. We characterize
galaxies with strong externally-triggered morphological distortions and normal
relatively undisturbed galaxies, using visual classification and quantitative
CAS parameters. We compare normal and distorted galaxies in terms of their
frequency, distribution within the cluster, star formation properties, and
relationship to dark matter (DM) or surface mass density, and intra-cluster
medium (ICM) density. We revisit the morphology density relation, which
postulates a higher fraction of early type galaxies in dense environments, by
considering separately galaxies with a low bulge-to-disk (B/D) ratio and a low
gas content as these two parameters may not be correlated in clusters. We
report here on our preliminary analysis.Comment: To appear in the ASP conference proceedings of the "Frank N. Bash
Symposium 2007: New Horizons in Astronomy", Eds. A. Frebel, J. Maund, J.
Shen, M. Siegel. 4 pages, 4 figure
Quantitative measure of evolution of bright cluster galaxies at moderate redshifts
Using archival data from the Hubble Space Telescope, we study the
quantitative morphological evolution of spectroscopically confirmed bright
galaxies in the core regions of nine clusters ranging in redshift from to . We use morphological parameters derived from two
dimensional bulge-disk decomposition to study the evolution. We find an
increase in the mean bulge-to-total luminosity ratio as the Universe
evolves. We also find a corresponding increase in the fraction of early type
galaxies and in the mean S\'ersic index. We discuss these results and their
implications to physical mechanisms for evolution of galaxy morphology.Comment: 5 pages, 3 figures, Accepted for publication in MNRAS: Letter
NLTE analysis of Co I/Co II lines in spectra of cool stars with new laboratory hyperfine splitting constants
We investigate the statistical equilibrium of Co in the atmospheres of cool
stars, and the influence of NLTE and HFS (hyperfine splitting) on the formation
of Co lines and abundances. Significant departures from LTE level populations
are found for Co I, also number densities of excited states in Co II differ
from LTE at low metallicity. The NLTE abundance of Co in solar photosphere is
4.95 +/- 0.04 dex, which is in agreement with that in C I meteorites within the
combined uncertainties. The spectral lines of Co I were calculated using the
results of recent measurements of hyperfine interaction constants by UV Fourier
transform spectrometry. For Co II, the first laboratory measurements of
hyperfine structure splitting A and B factors were performed. A differential
abundance analysis of Co is carried out for 18 stars in the metallicity range
-3.12 < [Fe/H] < 0. The abundances are derived by method of spectrum synthesis.
At low [Fe/H], NLTE abundance corrections for Co I lines are as large as +0.6
>... +0.8 dex. Thus, LTE abundances of Co in metal-poor stars are severely
underestimated. The stellar NLTE abundances determined from the single UV line
of Co II are lower by ~0.5-0.6 dex. The discrepancy might be attributed to
possible blends that have not been accounted for in the solar Co II line and
its erroneous oscillator strength. The increasing [Co/Fe] trend in metal-poor
stars, as calculated from the Co I lines under NLTE, can be explained if Co is
overproduced relative to Fe in massive stars. The models of galactic chemical
evolution are wholly inadequate to describe this trend suggesting that the
problem is in SN yields.Comment: submitted to MNRAS, 15 page
The chemical composition of donors in AM CVn stars and ultra-compact X-ray binaries: observational tests of their formation
We study the formation of ultra-compact binaries (AM CVn stars and
ultra-compact X-ray binaries) with emphasis on the surface chemical abundances
of the donors in these systems. Hydrogen is not convincingly detected in the
spectra of these systems. Three different proposed formation scenarios involve
different donor stars, white dwarfs, helium stars or evolved main-sequence
stars. Using detailed evolutionary calculations we show that the abundances of
helium WD donors and evolved main-sequence stars are close to equilibrium
CNO-processed material, and the detailed abundances correlate with the core
temperature and thus mass of the MS progenitors. Evolved MS donors typically
have traces of H left. For hybrid or CO white dwarf donors, the carbon and
oxygen abundances depend on the temperature of the helium burning and thus on
the helium core mass of the progenitors. For helium star donors in addition to
their mass, the abundances depend strongly on the amount of helium burnt before
mass transfer starts and can range from unprocessed and thus almost equal to
CNO-processed matter, to strongly processed and thus C/O rich and N-deficient.
We briefly discuss the relative frequency of these cases for helium star
donors, based on population synthesis results. Finally we give diagnostics for
applying our results to observed systems and find that the most important test
is the N/C ratio, which can indicate the formation scenario as well as, in some
cases, the mass of the progenitor of the donor. In addition, if observed, the
N/O, O/He and O/C ratios can distinguish between helium star and WD donors.
Applied to the known systems we find evidence for WD donors in the AM CVn
systems GP Com, CE 315 and SDSS J0804+16 and evidence for hybrid WD or very
evolved helium star donors in the UCXBs 4U 1626-67 and 4U 0614+09. [Abridged]Comment: Accepted for publication in MNRA
The efficacy of antihypertensiye drugs in chronic intermittent hypoxia conditions
The authors would like to thank the Portuguese Fundacao para a Ciencia e a Tecnologia (FCT) and CEDOC (Chronic Diseases Research Centre, Lisbon, Portugal). Lucilia N. Diogo is supported by an FCT fellowship (SFRH/BD/48335/2008; PTDC/SAU-TOX/112264/2009).Sleep apnea/hypopnea disorders include centrally originated diseases and obstructive sleep apnea (OSA). This last condition is renowned as a frequent secondary cause of hypertension (HT). The mechanisms involved in the pathogenesis of HT can be summarized in relation to two main pathways: sympathetic nervous system stimulation mediated mainly by activation of carotid body (CB) chemoreflexes and/or asphyxia, and, by no means the least important, the systemic effects of chronic intermittent hypoxia (CIH). The use of animal models has revealed that CIH is the critical stimulus underlying sympathetic activity and hypertension, and that this effect requires the presence of functional arterial chemoreceptors, which are hyperactive in CIH. These models of CIH mimic the HT observed in humans and allow the study of CIH independently without the mechanical obstruction component. The effect of continuous positive airway pressure (CRAP), the gold standard treatment for OSA patients, to reduce blood pressure seems to be modest and concomitant antihypertensive therapy is still required. We focus this review on the efficacy of pharmacological interventions to revert HT associated with CIH conditions in both animal models and humans. First, we explore the experimental animal models, developed to mimic HT related to CIH, which have been used to investigate the effect of antihypertensive drugs (AHDs). Second, we review what is known about drug efficacy to reverse HT induced by CIH in animals. Moreover, findings in humans with OSA are cited to demonstrate the lack of strong evidence for the establishment of a first-line antihypertensive regimen for these patients. Indeed, specific therapeutic guidelines for the pharmacological treatment of HT in these patients are still lacking. Finally, we discuss the future perspectives concerning the non-pharmacological and pharmacological management of this particular type of HT.publishersversionpublishe
DVenn – Um Software de Auxílio ao Aprendizado de Lógica nos Cursos de Graduação em Computação
Este artigo apresenta o DVenn, um software que mapeia expressões lógicas em diagramas de Venn. A aplicação, implementada na tecnologia JAVA, possibilita uma melhor compreensão durante o estudo de simplificação de expressões lógicas e auxilia o educando na compreensão e correção desuas atividades. Diferente de outras ferramentas de simplificação, esta recebe uma expressão lógica de qualquer tamanho, contendo até quatro variáveis distintas, e apresenta o diagrama resultante ao educando de forma gráfica
The Generic Blockchain Ecosystem and its Strategic Implications
The emergence of blockchain technology, most known due to the hype around Bitcoin, has the potential to transform entire industries, such as banking, insurance, or the Internet of Things (IoT). Yet, parallel ecosystems like cryptocurrencies that substitute products and services of traditional financial institutions emerged. However, literature does not provide a structured overview of the blockchain ecosystem. By analyzing 479 blockchain companies reported in the Crunchbase database, this paper visualizes the current blockchain ecosystem using the e3-value method consisting of eleven generic roles. Moreover, we identify three strategic implications where blockchain is fundamentally different from prior approaches: governance, trust, and openness. Scholars can apply the generic ecosystem for future research, while practitioners can use the model to identify possible disruptive actors or potential business opportunities
Archetypes for Industry 4.0 Business Model Innovations
Industry 4.0 (I4.0) also known as the fourth industrial revolution has emerged for describing the digitalization of manufacturing industries. In practice, the transition to I4.0 is crucial for manufacturing firms to sustain competitive advantage and seize new opportunities. Most research focuses on the technological aspects of I4.0 in form of product and process innovations. Despite I4.0’s rising attention among both researchers and practitioners, there exists only little research about I4.0 business model innovation (BMI), even though business model (BM) innovators can be more successful than product or process innovators. To address this research gap, we analyze 15 case studies of I4.0 BM innovators. We develop a taxonomy to characterize I4.0 BMs and derive 13 archetypes of I4.0 BMIs that describe transitions towards I4.0 BMs. The three identified super-archetypes are integration, servitization and expertise as a service. Our study deepens the understanding and structure of I4.0 BMs and I4.0 BMIs