31,750 research outputs found
Observing Remote Prescription of AT
A lack of widely accepted guidelines/protocols for remote prescription of assistive technology is noted. This paper reports observations from attempts to use web based videoconferencing with embedded tools for the provision of assistive technology to children with complex needs
The Cosmic Ray Observatory Project: A Statewide Outreach and Education Experiment in Nebraska
The Cosmic Ray Observatory Project (CROP) is a statewide education and
research experiment involving Nebraska high school students, teachers and
university undergraduates in the study of extensive cosmic-ray air showers. A
network of high school teams construct, install, and operate school-based
detectors in coordination with University of Nebraska physics professors and
graduate students. The detector system at each school is an array of
scintillation counters recycled from the Chicago Air Shower Array in
weather-proof enclosures on the school roof, with a GPS receiver providing a
time stamp for cosmic-ray events. The detectors are connected to triggering
electronics and a data-acquisition PC inside the building. Students share data
via the Internet to search for time coincidences with other sites. Funded by
the National Science Foundation, CROP has enlisted 29 schools with the aim of
expanding to the 314 high schools in the state over several years. This report
highlights both the scientific and professional development achievements of the
project to date.Comment: 4 pages, 4 figures, submitted to the 2007 International Cosmic Ray
Conference (ICRC2007), Merida, Mexico, July 200
Determination of hidden variable models reproducing the spin-singlet
The experimental violation of Bell inequality establishes necessary but not
sufficient conditions that any theory must obey. Namely, a theory compatible
with the experimental observations can satisfy at most two of the three
hypotheses at the basis of Bell's theorem: free will, no-signaling, and
outcome-Independence. Quantum mechanics satisfies the first two hypotheses but
not the latter. Experiments not only violate Bell inequality, but show an
excellent agreement with quantum mechanics. This fact restricts further the
class of admissible theories. In this work, the author determines the form of
the hidden-variable models that reproduce the quantum mechanical predictions
for a spin singlet while satisfying both the hypotheses of free will and
no-signaling. Two classes of hidden-variable models are given as an example,
and a general recipe to build infinitely many possible models is provided.Comment: Slightly revised version, 7 pages, no figures, to appear in PRA.
Final version, removed extra references no longer cite
Communication technologies and education: Lessons in the potential of innovation
The evaluation of initiatives in using new forms of technology to enhance teaching and learning will raise awareness of the need for a structured and principled approach to the introduction of innovative methods. This paper addresses the pedagogical potential of communication technology for curricular development in schools, initial teacher education and continuing professional development. It establishes principles of practice based on activities undertaken within a national project involving schools and higher‐education institutions
An investigation of the Eigenvalue Calibration Method (ECM) using GASP for non-imaging and imaging detectors
Polarised light from astronomical targets can yield a wealth of information
about their source radiation mechanisms, and about the geometry of the
scattered light regions. Optical observations, of both the linear and circular
polarisation components, have been impeded due to non-optimised
instrumentation. The need for suitable observing conditions and the
availability of luminous targets are also limiting factors. GASP uses division
of amplitude polarimeter (DOAP) (Compain and Drevillon) to measure the four
components of the Stokes vector simultaneously, which eliminates the
constraints placed upon the need for moving parts during observation, and
offers a real-time complete measurement of polarisation. Results from the GASP
calibration are presented in this work for both a 1D detector system, and a
pixel-by-pixel analysis on a 2D detector system. Following Compain et al. we
use the Eigenvalue Calibration Method (ECM) to measure the polarimetric
limitations of the instrument for each of the two systems. Consequently, the
ECM is able to compensate for systematic errors introduced by the calibration
optics, and it also accounts for all optical elements of the polarimeter in the
output. Initial laboratory results of the ECM are presented, using APD
detectors, where errors of 0.2% and 0.1{\deg} were measured for the degree of
linear polarisation and polarisation angle respectively. Channel-to-channel
image registration is an important aspect of 2-D polarimetry. We present our
calibration results of the measured Mueller matrix of each sample, used by the
ECM. A set of Zenith flat-field images were recorded during an observing
campaign at the Palomar 200 inch telescope in November 2012. From these we show
the polarimetric errors from the spatial polarimetry indicating both the
stability and absolute accuracy of GASP.Comment: Accepted for publication in Experimental Astronom
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