5,102 research outputs found
National Board-certified Teachers: Can They Make a Difference in Maine Schools?
The National Board for Professional Teaching Standards (NBPTS) was created in an effort to improve the status of teaching as a career. In 2006, the Maine legislature authorized a salary supplement for Maine teachers who were certified by the NBPTS. Sarah Mackenzie and Walter Harris describe their study focused on the value of NBPTS certification in professional development and teacher leadership; teacher motivation for seeking certification; barriers to certification; and how Maine teachers might be encouraged to seek certification. They point out that National Board certification is one among many ways to support and improve the quality of teaching in Maine
Essential Programs and Services Review: The Special Education Funding Model
The purpose of this document is to review the special education funding component of the Essential Programs and Services funding model. This component was first implemented in 2005 -2006 and first reviewed in 2007-08. In order to establish a context for this second review, the sections below include an overview of special education and funding in the U.S. and in Maine
A Deep ROSAT HRI Observation of NGC 1313
We describe a series of observations of NGC 1313 using the ROSAT HRI with a
combined exposure time of 183.5 ksec. The observations span an interval between
1992 and 1998; the purpose of observations since 1994 was to monitor the X-ray
flux of SN1978K, one of several luminous sources in the galaxy. No diffuse
emission is detected in the galaxy to a level of ~1-2x10^37 ergs/s/arcmin^-2. A
total of eight sources are detected in the summed image within the D_25
diameter of the galaxy. The luminosities of five of the eight range from
\~6x10^37 to ~6x10^38 erg/s; these sources are most likely accreting X-ray
binaries, similar to sources obseved in M31 and M33. The remaining three
sources all emit above 10^39 erg/s. We present light curves of the five
brightest sources. Variability is detected at the 99.9% level from four of
these. We identify one of the sources as an NGC 1313 counterpart of a Galactic
X-ray source. The light curve, though crudely sampled, most closely resembles
that of a Galactic black hole candidate such as GX339-4, but with considerably
higher peak X-ray luminosity. An additional seven sources lie outside of the
D_25 diameter and are either foreground stars or background AGN.Comment: 18 pages, 9 figures; accepted AJ, scheduled for November 200
First redshift determination of an optically/UV faint submillimeter galaxy using CO emission lines
We report the redshift of a distant, highly obscured submm galaxy (SMG),
based entirely on the detection of its CO line emission. We have used the newly
commissioned Eight-MIxer Receiver (EMIR) at the IRAM 30m telescope, with its 8
GHz of instantaneous dual-polarization bandwidth, to search the 3-mm
atmospheric window for CO emission from SMMJ14009+0252, a bright SMG detected
in the SCUBA Lens Survey. A detection of the CO(3--2) line in the 3-mm window
was confirmed via observations of CO(5--4) in the 2-mm window. Both lines
constrain the redshift of SMMJ14009+0252 to z=2.9344, with high precision (dz=2
10^{-4}). Such observations will become routine in determining redshifts in the
era of the Atacama Large Millimeter/submillimeter Array (ALMA).Comment: 5 pages, 3 figures, accepted by ApJ
Government support of the American Merchant Marine for more than national defense
http://www.archive.org/details/governmentsuppor00harrU.S. Navy (U.S.N.) authors
The Atacama Cosmology Telescope: CO(J = 3 - 2) mapping and lens modeling of an ACT-selected dusty star-forming galaxy
We report Northern Extended Millimeter Array (NOEMA) CO()
observations of the dusty star-forming galaxy ACT-S\,J020941+001557 at , which was detected as an unresolved source in the Atacama Cosmology
Telescope (ACT) equatorial survey. Our spatially resolved spectral line data
support the derivation of a gravitational lens model from 37 independent
velocity channel maps using a pixel-based algorithm, from which we infer a
velocity-dependent magnification factor with a
luminosity-weighted mean \left\approx 13. The resulting
source-plane reconstruction is consistent with a rotating disk, although other
scenarios cannot be ruled out by our data. After correction for lensing, we
derive a line luminosity , a cold gas mass , a dynamical mass , and a gas mass
fraction . The line brightness
temperature ratio of relative to a Green Bank Telescope
CO() detection may be elevated by a combination of external heating of
molecular clouds, differential lensing, and/or pointing errors.Comment: 8 pages, 5 figures, accepted to Ap
Dynamical density-density correlations in one-dimensional Mott insulators
The dynamical density-density correlation function is calculated for the
one-dimensional, half-filled Hubbard model extended with nearest neighbor
repulsion using the Lanczos algorithm for finite size systems and analytically
for large on site repulsion compared to hopping amplitudes. At the zone
boundary an excitonic feature exists for any finite nearest neighbor repulsion
and exhausts most of the spectral weight, even for parameters where no exciton
is visible at zero momentum.Comment: 5 pages, REVTeX, epsf, 3 postscript figure
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