20,321 research outputs found
Psychology Research Design and Methodology
This Grants Collection uses the grant-supported open course Psychology Research Design and Methodology from Columbus State University:
http://oer.galileo.usg.edu/psychology-ancillary/1/
This Grants Collection for Psychology Research Design and Methodology was created under a Round Two ALG Textbook Transformation Grant.
Affordable Learning Georgia Grants Collections are intended to provide faculty with the frameworks to quickly implement or revise the same materials as a Textbook Transformation Grants team, along with the aims and lessons learned from project teams during the implementation process.
Documents are in .pdf format, with a separate .docx (Word) version available for download. Each collection contains the following materials: Linked Syllabus Initial Proposal Final Reporthttps://oer.galileo.usg.edu/psychology-collections/1004/thumbnail.jp
Development and Use of Open Educational Resources in Research Methods for Psychology
Research methods course(s), a standard in psychology programs, often use multiple textbooks to address conceptual and data-analytic information. This study involved transitioning from traditional textbooks to open educational resources in a research methods course. Two psychology instructors, each offering course sections, identified open-access textbooks that aligned with course learning objectives and developed instructional materials to accompany those textbooks. All materials were organized publicly in an institutional subject guide. We compared studentsâ grades, pretest-posttest scores, and survey reports of resource use and evaluation in a spring semester, when traditional/costly textbooks were used, to the following fall semester, when no-cost textbooks were used. Student grades and pretest-posttest growth, and reported use and ratings of course materials, were similar across semesters. Though the present findings are limited in scope, they suggest that no-cost resources can be used successfully for teaching research methods with minimal transition difficulties and without student learning deficits
Towards an accurate model of the redshift space clustering of halos in the quasilinear regime
Observations of redshift-space distortions in spectroscopic galaxy surveys
offer an attractive method for measuring the build-up of cosmological
structure, which depends both on the expansion rate of the Universe and our
theory of gravity. Galaxies occupy dark matter halos, whose redshift space
clustering has a complex dependence on bias that cannot be inferred from the
behavior of matter. We identify two distinct corrections on quasilinear scales
(~ 30-80 Mpc/h): the non-linear mapping between real and redshift space
positions, and the non-linear suppression of power in the velocity divergence
field. We model the first non-perturbatively using the scale-dependent Gaussian
streaming model, which we show is accurate at the <0.5 (2) per cent level in
transforming real space clustering and velocity statistics into redshift space
on scales s>10 (s>25) Mpc/h for the monopole (quadrupole) halo correlation
functions. We use perturbation theory to predict the real space pairwise halo
velocity statistics. Our fully analytic model is accurate at the 2 per cent
level only on scales s > 40 Mpc/h. Recent models that neglect the corrections
from the bispectrum and higher order terms from the non-linear real-to-redshift
space mapping will not have the accuracy required for current and future
observational analyses. Finally, we note that our simulation results confirm
the essential but non-trivial assumption that on large scales, the bias
inferred from real space clustering of halos is the same one that determines
their pairwise infall velocity amplitude at the per cent level.Comment: 15 pages, 12 figures, submitted to MNRA
Prospects for ACT: simulations, power spectrum, and non-Gaussian analysis
A new generation of instruments will reveal the microwave sky at high
resolution. We focus on one of these, the Atacama Cosmology Telescope, which
probes scales 1000<l<10000, where both primary and secondary anisotropies are
important. Including lensing, thermal and kinetic Sunyaev-Zeldovich (SZ)
effects, and extragalactic point sources, we simulate the telescope's
observations of the CMB in three channels, then extract the power spectra of
these components in a multifrequency analysis. We present results for various
cases, differing in assumed knowledge of the contaminating point sources. We
find that both radio and infrared point sources are important, but can be
effectively eliminated from the power spectrum given three (or more) channels
and a good understanding of their frequency dependence. However, improper
treatment of the scatter in the point source frequency dependence relation may
introduce a large systematic bias. Even if all thermal SZ and point source
effects are eliminated, the kinetic SZ effect remains and corrupts measurements
of the primordial slope and amplitude on small scales. We discuss the
non-Gaussianity of the one-point probability distribution function as a way to
constrain the kinetic SZ effect, and we develop a method for distinguishing
this effect from the CMB in a window where they overlap. This method provides
an independent constraint on the variance of the CMB in that window and is
complementary to the power spectrum analysis.Comment: 22 pages, 11 figures. Submitted to New Astronomy. High resolution
figures provided at
http://www.princeton.edu/~khuffenb/pubs/prospects-act.htm
HST measures of Mass Accretion Rates in the Orion Nebula Cluster
The present observational understanding of the evolution of the mass
accretion rates (Macc) in pre-main sequence stars is limited by the lack of
accurate measurements of Macc over homogeneous and large statistical samples of
young stars. Such observational effort is needed to properly constrain the
theory of star formation and disk evolution. Based on HST/WFPC2 observations,
we present a study of Macc for a sample of \sim 700 sources in the Orion Nebula
Cluster, ranging from the Hydrogen-burning limit to M\ast \sim 2M\odot. We
derive Macc from both the U-band excess and the H{\alpha} luminosity
(LH{\alpha}), after determining empirically both the shape of the typical
accretion spectrum across the Balmer jump and the relation between the
accretion luminosity (Lacc) and LH{\alpha}, that is Lacc/L\odot =
(1.31\pm0.03)\cdotLH{\alpha}/L\odot + (2.63\pm 0.13). Given our large
statistical sample, we are able to accurately investigate relations between
Macc and the parameters of the central star such as mass and age. We clearly
find Macc to increase with stellar mass, and decrease over evolutionary time,
but we also find strong evidence that the decay of Macc with stellar age occurs
over longer timescales for more massive PMS stars. Our best fit relation
between these parameters is given by: log(Macc/M\odot\cdotyr)=(-5.12 \pm 0.86)
-(0.46 \pm 0.13) \cdot log(t/yr) -(5.75 \pm 1.47)\cdot log(M\ast/M\odot) +
(1.17 \pm 0.23)\cdot log(t/yr) \cdot log(M\ast/M\odot). These results also
suggest that the similarity solution model could be revised for sources with
M\ast > 0.5M\odot. Finally, we do not find a clear trend indicating
environmental effects on the accretion properties of the sources.Comment: 17 pages, 15 figures, accepted for publication in Ap
The First VLT FORS1 spectra of Lyman-break candidates in the HDF-S and AXAF Deep Field
We report on low-resolution multi-object spectroscopy of 30 faint targets (R
\~ 24-25) in the HDF-S and AXAF deep field obtained with the VLT Focal
Reducer/low dispersion Spectrograph (FORS1). Eight high-redshift galaxies with
2.75< z < 4 have been identified. The spectroscopic redshifts are in good
agreement with the photometric ones with a dispersion at z<2
and at z>2. The inferred star formation rates of the
individual objects are moderate, ranging from a few to a few tens solar masses
per year. Five out of the eight high-z objects do not show prominent emission
lines. One object has a spectrum typical of an AGN. In the AXAF field two
relatively close pairs of galaxies have been identified, with separations of
8.7 and 3.1 proper Mpc and mean redshifts of 3.11 and 3.93, respectively.Comment: 5 pages Latex, with 2 PostScript figures. Astronomy and Astrophysics,
in pres
A Rapid Evidence Assessment of the Effectiveness of Educational Interventions to Support Children and Young People with Attention Deficit Hyperactivity Disorder
A Quantitative Theory of Laser-Generated Ultrasound
The basic work of R. M. White [1] on the generation of elastic waves by transient surface heating was followed by numerous theoretical and experimental investigations, to understand the nature of the strange elastic waveforms obtained and to make this technique available for practical applications [2]. The theoretical considerations of L. R. F. Rose [3] about a point of dilation just below the surface of an elastic halfspace leads to a reasonable qualitative agreement with experiments, but do not relate all relevant material and laser beam parameters to the displacement field. This contributions outlines the application of an extended theory to a complete system of nondestructive evaluation, taking into account the structure of different laser modes, the optical, thermal and elastic material properties as well as the finite area of a capacitance transducer
Forecasting Cosmological Constraints from Redshift Surveys
Observations of redshift-space distortions in spectroscopic galaxy surveys
offer an attractive method for observing the build-up of cosmological
structure, which depends both on the expansion rate of the Universe and our
theory of gravity. In this paper we present a formalism for forecasting the
constraints on the growth of structure which would arise in an idealized
survey. This Fisher matrix based formalism can be used to study the power and
aid in the design of future surveys.Comment: 7 pages, 5 figures, minor revisions to match version accepted by
MNRA
Central America Field Epidemiology Training Program (CA FETP): a pathway to sustainable public health capacity development
The Central America Field Epidemiology Training Program (CA FETP) is a public health capacity-building training programme aimed at developing high-caliber field epidemiologists at various levels of the public health system. It began in 2000 as part of the effort to rebuild public health infrastructure in six Central American and Caribbean countries following the devastation of Hurricanes Mitch and Georges in late 1998. Since then, the CA FETP has evolved from one regional training programme managed by CDC to several national FETPs with each country assuming ownership of its domestic programme. The curriculum is competency-based, and is divided into a three-tiered training pyramid that corresponds to the needs at the local, district and central levels of the health system. Trainees at each tier spend about 20% of their time in the classroom and 80% in the field implementing what they have learned while being mentored by graduates of the programme. FETP trainees have responded to multiple natural disasters and conducted hundreds of investigations including surveillance evaluations, outbreak responses and planned studies. Also graduates of the CA FETP are assuming influential positions in their respective ministries. As countries meet the challenge of institutionalizing their programmes, the CA FETP concept will increasingly be recognized as a model for sustainable public health capacity development
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