1,744 research outputs found
GOVERNANCE OF THE U.S. UNIVERSITY: ORGANIZATIONAL STRUCTURE AND CHANGING POWER RELATIONSHIPS IN COMPARATIVE PERSPECTIVE
"This paper provides a comparative perspective on changes in the governance of U.S.
universities in the past two decades. An analysis of trends revealed in U.S. national surveys
in 1992 and 2007 shows that faculty influence in decision making has become much
more limited to personnel issues, while the influence of academic middle management -
particular department chairs and deans - has expanded, especially in matters of budget
and establishment of new academic programs, at both the expense of the faculty and even
the central university administration." --
Research Panel: Variation in Women Attaining Full Professorships at Research Universities and Non-Tenured Faculty Systems in the US and Abroad
Employing Part-Time and Temporary Academic Staff: A Comparative Perspectiv
GOVERNANCE OF THE U.S. UNIVERSITY: ORGANIZATIONAL STRUCTURE AND CHANGING POWER RELATIONSHIPS IN COMPARATIVE PERSPECTIVE
"This paper provides a comparative perspective on changes in the governance of U.S.
universities in the past two decades. An analysis of trends revealed in U.S. national surveys
in 1992 and 2007 shows that faculty influence in decision making has become much
more limited to personnel issues, while the influence of academic middle management -
particular department chairs and deans - has expanded, especially in matters of budget
and establishment of new academic programs, at both the expense of the faculty and even
the central university administration." --
The New Normal? The Changing Context of Academic Work and Careers
This presentation focuses on changing working conditions for faculty in higher education
Comparing Academic and Non-Academic Salaries: Establishing Homogeneous Groups by Discipline, Educational Credentials, and Job Category
This presentation compares academic and non-academic salaries, demonstrating variations by field, sub-field and industry, sector, and career stage. The fields considered are law, biology, psychology, and engineering
The HETDEX Pilot Survey III: The Low Metallicities of High-Redshift Lyman Alpha Galaxies
We present Keck/NIRSPEC spectroscopic observations of three Lyman alpha
emitting galaxies (LAEs) at z ~ 2.3 discovered with the HETDEX pilot survey. We
detect Halpha, [OIII], and Hbeta emission from two galaxies at z = 2.29 and
2.49, designated HPS194 and HPS256, respectively, representing the first
detection of multiple rest-frame optical emission lines in galaxies at
high-redshift selected on the basis of their Lyman alpha emission. The
redshifts of the Lyman alpha emission from these galaxies are offset redward of
the systemic redshifts by Delta_v = 162 +/- 37 (photometric) +/- 42
(systematic) km/s for HPS194, and Delta_v = 36 +/- 35 +/- 18 km/s for HPS256.
An interpretation for HPS194 is that a large-scale outflow may be occurring in
its interstellar medium. The emission line ratios imply that neither LAE hosts
an active galactic nucleus. Using the upper limits on the [NII] emission we
place meaningful constraints on the gas-phase metallicities in these two LAEs
of Z < 0.17 and < 0.28 Zsol (1 sigma). Measuring the stellar masses of these
objects via spectral energy distribution (SED) fitting (~ 10^10 and 6 x 10^8
Msol, respectively), we study the nature of LAEs in a mass-metallicity plane.
At least one of these two LAEs appears to be more metal poor than
continuum-selected star-forming galaxies at the same redshift and stellar mass,
implying that objects exhibiting Lyman alpha emission may be systematically
less chemically enriched than the general galaxy population. We use the SEDs of
these two galaxies to show that neglecting the emission lines when fitting
stellar population models to the observed photometry can result in
overestimates of the population age by orders of magnitude, and the stellar
mass by a factor of ~ 2. This effect is particularly important at z > 7, where
similarly strong emission lines may masquerade in the photometry as a 4000 A
break (abridged).Comment: Replaced with the accepted (to ApJ) versio
Zero-bias conductance in carbon nanotube quantum dots
We present numerical renormalization group calculations for the zero-bias
conductance of quantum dots made from semiconducting carbon nanotubes. These
explain and reproduce the thermal evolution of the conductance for different
groups of orbitals, as the dot-lead tunnel coupling is varied and the system
evolves from correlated Kondo behavior to more weakly correlated regimes. For
integer fillings of an SU(4) model, we find universal scaling
behavior of the conductance that is distinct from the standard SU(2) universal
conductance, and concurs quantitatively with experiment. Our results also agree
qualitatively with experimental differential conductance maps.Comment: 4 pages, 5 figure
Ly alpha emitting galaxies as early stages in galaxy formation
We present optical spectroscopy of two samples of GALEX grism selected Ly
alpha emitters (LAEs): one at z=0.195-0.44 and the other at z=0.65-1.25. We
have also observed a comparison sample of galaxies in the same redshift
intervals with the same UV magnitude distributions but with no detected Ly
alpha. We use the optical spectroscopy to eliminate active galactic nuclei
(AGNs) and to obtain the optical emission-line properties of the samples. We
compare the luminosities of the LAEs in the two redshift intervals and show
that there is dramatic evolution in the maximum Ly alpha luminosity over z=0-1.
Focusing on the z=0.195-0.44 samples alone, we show that there are tightly
defined relations between all of the galaxy parameters and the rest-frame
equivalent width (EW) of H alpha. The higher EW(H alpha) sources all have lower
metallicities, bluer colors, smaller sizes, and less extinction, consistent
with their being in the early stages of the galaxy formation process. We find
that 75 +- 12% of the LAEs have EW(H alpha)>100 Angstrom, and, conversely, that
31 +/- 3% of galaxies with EW(H alpha)>100 Angstrom are LAEs. We correct the
broadband magnitudes for the emission-line contributions and use spectral
synthesis fits to estimate the ages of the galaxies. We find a median age of
1.1x10^{8} yr for the LAE sample and 1.4x10^{9} yr for the UV-continuum sample
without detected Ly alpha. The median metallicity of the LAE sample is
12+log(O/H)=8.24, or about 0.4 dex lower than the UV-continuum sample.Comment: to be published in the Astrophysical Journa
A Flux-Limited Sample of z~1 Ly-alpha Emitting Galaxies in the CDFS
We describe a method for obtaining a flux-limited sample of Ly-alpha emitters
from GALEX grism data. We show that the multiple GALEX grism images can be
converted into a three-dimensional (two spatial axes and one wavelength axis)
data cube. The wavelength slices may then be treated as narrowband images and
searched for emission-line galaxies. For the GALEX NUV grism data, the method
provides a Ly-alpha flux-limited sample over the redshift range z=0.67-1.16. We
test the method on the Chandra Deep Field South field, where we find 28
Ly-alpha emitters with faint continuum magnitudes (NUV>22) that are not present
in the GALEX pipeline sample. We measure the completeness by adding artificial
emitters and measuring the fraction recovered. We find that we have an 80%
completeness above a Ly-alpha flux of 10^-15 erg/cm^2/s. We use the UV spectra
and the available X-ray data and optical spectra to estimate the fraction of
active galactic nuclei in the selection. We report the first detection of a
giant Ly-alpha blob at z<1, though we find that these objects are much less
common at z=1 than at z=3. Finally, we compute limits on the z~1 Ly-alpha
luminosity function and confirm that there is a dramatic evolution in the
luminosity function over the redshift range z=0-1.Comment: 18 pages, in press at The Astrophysical Journa
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