1,000 research outputs found
Aprendendo e ensinando através do uso de materiais recicláveis na Educação Infantil
This paper presents considerations about the pedagogical practices carried out with a class of Childhood Education in the public schools system in the city of Panambi (RS). The overall objective consisted in investigating, describing and analyzing the reflexive records about the playful activities developed in the Childhood Education, highlighting the importance of the interactions and entertainment to learning using pedagogic materials made from waste. The methodology used was the bibliographic research, of field and participating. To draw up this article we sought references on the theorists Wajskop (1995), Santos (2000), Pereira (2006; 2009), Freire (2002), Negrine (1994) and Kishimoto (1998, 2010), among other researchers in the area of solid waste.Este artigo apresenta reflexões sobre as práticas pedagógicas realizadas com uma turma de Educação Infantil na rede municipal no município de Panambi (RS). O objetivo geral consistiu em investigar, descrever e analisar os registros reflexivos acerca das atividades lúdicas desenvolvidas na Educação Infantil, destacando a importância das interações e brincadeiras para a aprendizagem utilizando de materiais pedagógicos elaborados a partir de resíduos. A metodologia utilizada foi a pesquisa bibliográfica, de campo e participante. Para elaboração deste artigo, buscou-se referencial nos teóricos Wajskop (1995), Santos (2000), Pereira (2006; 2009), Freire (2002), Negrine (1994) e Kishimoto (1998; 2010), entre outros pesquisadores na área dos resíduos sólidos
In vivo imaging enables high resolution preclinical trials on patients' leukemia cells growing in mice.
Xenograft mouse models represent helpful tools for preclinical studies on human tumors. For modeling the complexity of the human disease, primary tumor cells are by far superior to established cell lines. As qualified exemplary model, patients' acute lymphoblastic leukemia cells reliably engraft in mice inducing orthotopic disseminated leukemia closely resembling the disease in men. Unfortunately, disease monitoring of acute lymphoblastic leukemia in mice is hampered by lack of a suitable readout parameter
Regulamentação e avanço educacional em cenário de digitalização televisiva e convergência
In front of the imperativeness of a Law of Social Communication, which should establish the new regulatory framework for communications in Brazil, in line with the digital technology, this article seeks reflections on the legislative changes related to the confluence digital TV and education. Television and school form a binomial present in the path of education since the emergence of this mean of communication, considering its great strength as a producer of meanings and connotations, acting, especially, as an agent of socialization. On this direction, the TV Escola is a good example, whose prospects amplify itself, with the digital television. Therefore it is critical to understand the movements of public policy areas such as broadcasting and education in the convergence scenario, as well as the main project of education via television, since such dynamics can draw horizons and define the means of interaction among individuals, organizations and public and also private institutions.Diante da imperatividade de uma Lei de Comunicação Social, a qual deve estabelecer o novo marco regulatório das comunicações no Brasil, em sintonia com a digitalização, o presente artigo busca refletir sobre a alteração legislativa em relação à confluência TV digital e educação. Televisão e escola formam um binômio presente na trajetória da educação desde o surgimento desse meio de comunicação, tendo em vista sua grande força como produtora de sentidos e significados, atuando, especialmente, como agente de socialização. Nessa direção, a TV Escola é um exemplo, cujas perspectivas ampliam-se com a digitalização televisiva. Assim, torna-se crucial compreender os movimentos das políticas públicas de áreas como radiodifusão e educação, em cenário de convergência, bem como o quadro do principal projeto de educação via televisão, uma vez que tais dinâmicas podem traçar horizontes e definir os modos de interação entre pessoas, organizações e instituições públicas e privadas
Near Infrared Spectra and Intrinsic Luminosities of Candidate Type II Quasars at 2 < z < 3.4
We present JHK near-infrared (NIR) spectroscopy of 25 candidate Type II
quasars selected from the Sloan Digital Sky Survey, using Triplespec on the
Apache Point Observatory 3.5m telescope, FIRE at the Magellan/Baade 6.5m
telescope, and GNIRS on Gemini. At redshifts of 2 < z < 3.4, our NIR spectra
probe the rest-frame optical region of these targets, which were initially
selected to have strong lines of CIV and Ly alpha, with FWHM<2000 km/s from the
SDSS pipeline. We use the [OIII]5007 line shape as a model for the narrow line
region emission, and find that \halpha\ consistently requires a broad component
with FWHMs ranging from 1000 to 7500 km/s. Interestingly, the CIV lines also
require broad bases, but with considerably narrower widths of 1000 to 4500
km/s. Estimating the extinction using the Balmer decrement and also the
relationship in lower-z quasars between rest equivalent width and luminosity in
the [OIII] line, we find typical A_V values of 0-2 mag, which naturally explain
the attenuated CIV lines relative to Halpha. We propose that our targets are
moderately obscured quasars. We also describe one unusual object with three
distinct velocity peaks in its [OIII] spectrum.Comment: Accepted for publication in ApJ, 18 pages, 14 figure
A Glimpse at Quasar Host Galaxy Far-UV Emission, Using DLAs as Natural Coronagraphs
In merger-driven models of massive galaxy evolution, the luminous quasar
phase is expected to be accompanied by vigorous star formation in quasar host
galaxies. In this paper, we use high column density Damped Lyman Alpha (DLA)
systems along quasar sight lines as natural coronagraphs to directly study the
far-UV (FUV) radiation from the host galaxies of luminous background quasars.
We have stacked the spectra of 2,000 DLA systems (N_HI>10^{20.6} cm^{-2})
with a median absorption redshift = 2.6 selected from quasars observed in
the SDSS-III Baryon Oscillation Spectroscopic Survey. We detect residual flux
in the dark troughs of the composite DLA spectra. The level of this residual
flux significantly exceeds systematic errors in the SDSS fiber sky subtraction;
furthermore, the residual flux is strongly correlated with the continuum
luminosity of the background quasar, while uncorrelated with DLA column density
or metallicity. We conclude that the flux could be associated with the average
FUV radiation from the background quasar host galaxies (with medium redshift <
z > = 3.1) that is not blocked by the intervening DLA. Assuming all of the
detected flux originates from quasar hosts, for the highest quasar luminosity
bin (= 2.5x 10^{13} L_sun), the host galaxy has a FUV intensity of 1.5 +/-
0.2 x 10^{40} erg s^{-1} A^{-1}; this corresponds to an unobscured UV star
formation rate of 9 M_sun/yr.Comment: 15 pages, 10 figures, Accepted for publication in Ap
Successful transition to elementary school and the implementation of facilitative practices specified in the Reggio-Emilia philosophy
Systematic, mandated facilitation of school transitions is an important but understudied aspect of the Reggio-Emilia approach to early childhood education admired internationally as best practice. We studied the links between Northern Italian transition practices and academic achievement, school liking, cooperativeness, and problem behaviors. We followed 288 students across a transition from preschool to elementary school. Schools varied in their implementation of transition practices. High implementation of Reggio-type transition practices was related to significantly more school liking and significantly fewer problem behaviors after the transition. At follow-up at the end of the post-transition year, high-implementation schools were still characterized by lower levels of problem behavior. These data indicate that the facilitation of school transitions in the Reggio-Emilia tradition is associated with successful post-transition adjustment
Candidate Type II Quasars at 2 < z < 4.3 in the Sloan Digital Sky Survey III
At low redshifts, dust-obscured quasars often have strong yet narrow
permitted lines in the rest-frame optical and ultraviolet, excited by the
central active nucleus, earning the designation Type II quasars. We present a
sample of 145 candidate Type II quasars at redshifts between 2 and 4.3,
encompassing the epoch at which quasar activity peaked in the universe. These
objects, selected from the quasar sample of the Baryon Oscillation
Spectroscopic Survey of the Sloan Digital Sky Survey III, are characterized by
weak continuum in the rest-frame ultraviolet (typical continuum magnitude of i
\approx 22) and strong lines of CIV and Ly \alpha, with Full Width at Half
Maximum less than 2000 kms-1. The continuum magnitudes correspond to an
absolute magnitude of -23 or brighter at redshift 3, too bright to be due
exclusively to the host galaxies of these objects. Roughly one third of the
objects are detected in the shorter-wavelength bands of the WISE survey; the
spectral energy distributions (SEDs) of these objects appear to be intermediate
between classic Type I and Type II quasars seen at lower redshift. Five objects
are detected at rest frame 6\mu m by Spitzer, implying bolometric luminosities
of several times 10^46 erg s-1. We have obtained polarization measurements for
two objects; they are roughly 3% polarized. We suggest that these objects are
luminous quasars, with modest dust extinction (A_V ~ 0.5 mag), whose
ultraviolet continuum also includes a substantial scattering contribution.
Alternatively, the line of sight to the central engines of these objects may be
partially obscured by optically thick material.Comment: 26 pages, 13 figures, 10 tables, 4 machine readable tables. Accepted
for publication in MNRA
Type II Quasars from the Sloan Digital Sky Survey: V. Imaging host galaxies with the Hubble Space Telescope
Type II quasars are luminous Active Galactic Nuclei whose centers are
obscured by large amounts of gas and dust. In this paper we present 3-band HST
images of nine type II quasars with redshifts 0.2 < z < 0.4 selected from the
Sloan Digital Sky Survey based on their emission line properties. The intrinsic
luminosities of these AGN are estimated to be -24 > M_B > -26, but optical
obscuration allows their host galaxies to be studied unencumbered by bright
nuclei. Each object has been imaged in three continuum filters (`UV', `blue'
and `yellow') placed between the strong emission lines. The spectacular, high
quality images reveal a wealth of details about the structure of the host
galaxies and their environments. Six of the nine galaxies in the sample are
ellipticals with de Vaucouleurs light profiles, one object has a well-defined
disk component and the remaining two have marginal disks. Stellar populations
of type II quasar hosts are more luminous (by a median of 0.3-0.7 mag,
depending on the wavelength) and bluer (by about 0.4 mag) than are M* galaxies
at the same redshift. When smooth fits to stellar light are subtracted from the
images, we find both positive and negative residuals that become more prominent
toward shorter wavelengths. We argue that the negative residuals are due to
kpc-scale dust obscuration, while most positive residuals are due to the light
from the nucleus scattered off interstellar material in the host galaxy.
Scattered light makes a significant contribution to the broad band continuum
emission and can be the dominant component of the extended emission in the UV
in extreme cases.Comment: 51 pages, including 12 grey scale figures, 4 color figures, 5 tables.
In press in AJ. Version with higher-resolution images available at
http://www.astro.princeton.edu/~nadia/qso2.html. (Minor changes in response
to the referee report
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