73 research outputs found
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When Tutors Self Tutor: What Preservice Teachers Learn about Themselves, Technology, and Teaching during a Time of Remote Learning
Tutoring has been called “the act of saying to somebody else, ‘Let me help you learn’ ” (Chin, Rabow, & Estrada, 2011, p. 2). Teacher preparation programs regularly encourage college students becoming elementary or secondary school teachers to tutor younger learners as an early school-based field experience. Tutors, acting as teachers, must learn how to provide ideas and information to aid and encourage students to accomplish learning goals. Tutors must also assess the effectiveness of their decisions about when and how to implement different instructional strategies to respond to students’ needs
A necessidade de uma abordagem padrão para avaliação da funcionalidade do abastecimento de água em comunidade rural
Near Infrared polarimetry of a sample of YSOs
Our goal is to study the physical properties of the circumstellar environment
of young stellar objetcs (YSOs). In particular, the determination of the
scattering mechanism can help to constrain the optical depth of the disk and/or
envelope in the near infrared. We used the IAGPOL imaging polarimeter along
with the CamIV infrared camera at the LNA observatory to obtain near infrared
polarimetry measurements at the H band of a sample of optically visible YSOs,
namely, eleven T Tauri stars and eight Herbig Ae/Be stars. An independent
determination of the disk (or jet) orientation was obtained for twelve objects
from the literature. The circumstellar optical depth could be then estimated
comparing the integrated polarization position angle (PA) with the direction of
the major axis of the disk projected in the plane of the sky. In general,
optically thin disks have polarization PA perpendicular to the disk plane. In
contrast, optically thick disks produce polarization PA parallel to the disks.
Among the T Tauri stars, three are consistent with optically thin disks (AS
353A, RY Tau and UY Aur) and five with optically thick disks (V536 Aql, DG Tau,
DO Tau, HL Tau and LkHalpha 358). Among the Herbig Ae/Be stars, two stars show
evidence of optically thin disk (Hen 3-1191 and VV Ser) and two of optically
thick disks (PDS 453 and MWC 297). Our results seem consistent with the fact
that optically thick disks at near infrared bands are associated more likely
with younger YSOs. Marginal evidence of polarization reversal is found in RY
Tau, RY Ori, WW Vul, and UY Aur. On the first three cases this feature can be
associated to the UXOR phenomenon. Correlations with the IRAS colours and the
spectral index yielded evidence of an evolutionary segregation with the disks
tend to be optically thin when they are older.Comment: 15 pages, 15 figures, accepted in Astronomy and Astrophysic
Challenges in outdoor tourism explorations: an embodied approach
Methodological challenges are rarely discussed in depth among outdoor adventure tourism scholars. Despite the prevailing quali- tative approaches in this field, and the recognition that the fleet- ingness of the human experience and the non-linearity and unpredictability of the more-than-human world have the power to influence the research process, the messy, negotiated and often contested researcher’s role has been less considered. In addressing this, the aim here is to critically discuss the methodo- logical approach to explorations of the outdoor experiences through deconstructing the researcher’s role. Through renderings of the existentialist propositions of being in the world and a post- structuralist philosophy of fluidity and flux, the attention is granted to embodied experiences as a way of generating knowl- edges. Being situated in the research setting, space is created for interrogation of the processual dimensions of commodified out- door journeys from an emic, researcher-as-tourist perspective. Research in the outdoor scenaria is by no means a linear process but rather a messy, complex and often ruptured journey, further complicated by the ethical concerns, struggles and idiosyncrasies of the researcher. I thus discuss the nuances and complexities of doing the embodied research and the haphazard ways of data collection. In shifting attention to more existential aspects of being in the outdoors through the process of post-experiential reflections, discomfort emerged as a critical quality of the outdoor experience. I thus illuminate the significance of embodied research and epiphenomenal discoveries in the production of new knowledges, to which greater attention, both in theoretical and methodological conversations, should be paid in the future
Star-forming cores embedded in a massive cold clump: Fragmentation, collapse and energetic outflows
The fate of massive cold clumps, their internal structure and collapse need
to be characterised to understand the initial conditions for the formation of
high-mass stars, stellar systems, and the origin of associations and clusters.
We explore the onset of star formation in the 75 M_sun SMM1 clump in the region
ISOSS J18364-0221 using infrared and (sub-)millimetre observations including
interferometry. This contracting clump has fragmented into two compact cores
SMM1 North and South of 0.05 pc radius, having masses of 15 and 10 M_sun, and
luminosities of 20 and 180 L_sun. SMM1 South harbours a source traced at 24 and
70um, drives an energetic molecular outflow, and appears supersonically
turbulent at the core centre. SMM1 North has no infrared counterparts and shows
lower levels of turbulence, but also drives an outflow. Both outflows appear
collimated and parsec-scale near-infrared features probably trace the
outflow-powering jets. We derived mass outflow rates of at least 4E-5 M_sun/yr
and outflow timescales of less than 1E4 yr. Our HCN(1-0) modelling for SMM1
South yielded an infall velocity of 0.14 km/s and an estimated mass infall rate
of 3E-5 M_sun/yr. Both cores may harbour seeds of intermediate- or high-mass
stars. We compare the derived core properties with recent simulations of
massive core collapse. They are consistent with the very early stages dominated
by accretion luminosity.Comment: Accepted for publication in ApJ, 14 pages, 7 figure
The Herschel-SPIRE Legacy Survey (HSLS): the scientific goals of a shallow and wide submillimeter imaging survey with SPIRE
A large sub-mm survey with Herschel will enable many exciting science opportunities, especially in an era of wide-field optical and radio surveys and high resolution cosmic microwave background experiments. The Herschel-SPIRE Legacy Survey (HSLS), will lead to imaging data over 4000 sq. degrees at 250, 350, and 500 micron. Major Goals of HSLS are: (a) produce a catalog of 2.5 to 3 million galaxies down to 26, 27 and 33 mJy (50% completeness; 5 sigma confusion noise) at 250, 350 and 500 micron, respectively, in the southern hemisphere (3000 sq. degrees) and in an equatorial strip (1000 sq. degrees), areas which have extensive multi-wavelength coverage and are easily accessible from ALMA. Two thirds of the of the sources are expected to be at z > 1, one third at z > 2 and about a 1000 at z > 5. (b) Remove point source confusion in secondary anisotropy studies with Planck and ground-based CMB data. (c) Find at least 1200 strongly lensed bright sub-mm sources leading to a 2% test of general relativity. (d) Identify 200 proto-cluster regions at z of 2 and perform an unbiased study of the environmental dependence of star formation. (e) Perform an unbiased survey for star formation and dust at high Galactic latitude and make a census of debris disks and dust around AGB stars and white dwarfs
EFSA BIOHAZ Panel (EFSA Panel on Biological Hazards, 2013. Scientific Opinion on the public health hazards to be covered by inspection of meat from sheep and goats.
Estimating The Potential Cost Savings From The New York University Caregiver Intervention In Minnesota
Amniotic Membrane Graft for the Management of Scleral Melting and Corneal Perforation in Recalcitrant Infectious Scleral and Corneoscleral Ulcers
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