1,048 research outputs found
The PhD Project: How Successful Is It?
The PhD Project’s mission to diversify the work force by increasing the diversity of business school faculty is quite admirable, but is the Project successful? To gather insights toward responding to that question and to offer suggestions, we reviewed three of the Project’s objectives that relate most closely to minority doctoral students and faculty members. We examined the Project’s website, held discussions with Project staff members, and surveyed Project alumni. Among the myriad of PhD Project activities, the most important are its annual November conference for potential doctoral students and its annual minority doctoral student association meetings for each of five academic disciplines (accounting, finance, information systems, management and marketing). The annual conference attracts between 350 and 400 individuals from which about 10% enroll in doctoral programs each year. The doctoral student associations have over 1,400 members of which some 400 are current doctoral students and the others are faculty members. The Project is making significant progress toward accomplishing its mission and objectives. Areas where the Project could improve its accomplishments include identifying why those who have considered enrollment have not done so, placing greater emphasis on teaching and service at minority doctoral student association conferences, and strengthening mentoring relationships
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Simulated Spectra for Autonomous Arctic Infrared Observer
Polar regions are characterized by their remoteness, making measurements
challenging, but an improved knowledge of clouds and radiation is necessary
to understand polar climate change. Infrared radiance spectrometers can
operate continuously from the surface and have low power requirements
relative to active sensors. Here we explore the feasibility of retrieving
cloud height with an infrared spectrometer that would be designed for use in
remote polar locations. Using a wide variety of simulated spectra of
mixed-phase polar clouds at varying instrument resolutions, retrieval
accuracy is explored using the CO2 slicing/sorting and the minimum local emissivity variance (MLEV) methods. In the absence of imposed errors and for clouds with optical depths greater than ∼ 0.3, cloud-height retrievals
from simulated spectra using CO2 slicing/sorting and MLEV are found to have roughly equivalent high accuracies: at an instrument resolution of
0.5 cm−1, mean biases are found to be ∼ 0.2 km for clouds with bases
below 2 and −0.2 km for higher clouds. Accuracy is found to decrease with
coarsening resolution and become worse overall for MLEV than for CO2
slicing/sorting; however, the two methods have differing sensitivity to
different sources of error, suggesting an approach that combines them. For
expected errors in the atmospheric state as well as both instrument noise and
bias of 0.2 mW/(m2 sr cm−1), at a resolution of 4 cm−1, average retrieval errors are found to be less than ∼ 0.5 km for cloud bases within 1 km of the surface, increasing to ∼ 1.5 km at 4 km. This
sensitivity indicates that a portable, surface-based infrared radiance
spectrometer could provide an important complement in remote locations to
satellite-based measurements, for which retrievals of low-level cloud are
challenging
Plasma and urine neutrophil gelatinase-associated lipocalin as markers of acute kidney injury in critically ill adults
Bistability of Slow and Fast Traveling Waves in Fluid Mixtures
The appearence of a new type of fast nonlinear traveling wave states in
binary fluid convection with increasing Soret effect is elucidated and the
parameter range of their bistability with the common slower ones is evaluated
numerically. The bifurcation behavior and the significantly different
spatiotemporal properties of the different wave states - e.g. frequency, flow
structure, and concentration distribution - are determined and related to each
other and to a convenient measure of their nonlinearity. This allows to derive
a limit for the applicability of small amplitude expansions. Additionally an
universal scaling behavior of frequencies and mixing properties is found.
PACS: 47.20.-k, 47.10.+g, 47.20.KyComment: 4 pages including 5 Postscript figure
Wavelength-Gated Photochemical Synthesis of Phenalene Diimides
Herein, we pioneer a wavelength‐gated synthesis route to phenalene diimides. Consecutive Diels–Alder reactions of methylisophthalaldehydes and maleimides afford hexahydro‐phenalene‐1,6‐diol diimides via 5‐formyl‐hexahydro‐benzo[f]isoindoles as the intermediate. Both photoreactions are efficient (82–99 % yield) and exhibit excellent diastereoselectivity (62–98 % d.r.). The wavelength‐gated nature of the stepwise reaction enables the modular construction of phenalene diimide scaffolds by choice of substrate and wavelength. Importantly, this synthetic methodology opens a facile avenue to a new class of persistent phenalenyl diimide neutral radicals, constituting a versatile route to spin‐active molecules
Widening participation in higher education: student quantitative skills and independent learning as impediments to progression
The UK government's widening participation strategy, and the concomitant development of a mass higher education system, has imposed a variety of pressures on higher education institutions. Not least of these is the changing nature of the student population, and the assumptions that can be made about its skills and knowledge base. It should not be surprising that this rapid expansion of the higher education system has resulted in declining student progression and retention rates. This paper takes a case study approach and attempts to identify the range of factors that might explain the variability of student performance on a first year undergraduate introductory statistics module. The paper concludes that there are no simple predictors of success or failure. However, there is evidence to suggest that any innovations in delivery need to take account of individual student development and that the presumption that students can rapidly become independent learners upon initial entry to higher education is an unrealistic one
Wetting of a symmetrical binary fluid mixture on a wall
We study the wetting behaviour of a symmetrical binary fluid below the
demixing temperature at a non-selective attractive wall. Although it demixes in
the bulk, a sufficiently thin liquid film remains mixed. On approaching
liquid/vapour coexistence, however, the thickness of the liquid film increases
and it may demix and then wet the substrate. We show that the wetting
properties are determined by an interplay of the two length scales related to
the density and the composition fluctuations. The problem is analysed within
the framework of a generic two component Ginzburg-Landau functional
(appropriate for systems with short-ranged interactions). This functional is
minimized both numerically and analytically within a piecewise parabolic
potential approximation. A number of novel surface transitions are found,
including first order demixing and prewetting, continuous demixing, a
tricritical point connecting the two regimes, or a critical end point beyond
which the prewetting line separates a strongly and a weakly demixed film. Our
results are supported by detailed Monte Carlo simulations of a symmetrical
binary Lennard-Jones fluid at an attractive wall.Comment: submitted to Phys. Rev.
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