19,571 research outputs found
Light element abundances in He-rich stars
We present an abundance analysis of light elements in He-rich stars. The
analysis is based on both low and high resolution observations collected at
ESO, La Silla, Chile in the optical region and includes 6 standards and 21
He-rich stars. Light-element abundances display a diverse pattern: they range
from under-solar up to above-solar values.Comment: 4 pages, no figure, to appear in: Proc. of the 26th workshop of the
European Working Group on CP stars, eds. P. North, A. Schnell and J.
Ziznovsky, Contrib. Astr. Obs. Skalnate Pleso Vol. 27, No
DATA AND MODELS FOR EFFECTIVE RESEARCH AND DEVELOPMENT IN POLLUTION CONTROL
Environmental Economics and Policy,
FINANCIAL IMPLICATIONS OF WASTE MANAGEMENT SYSTEMS FOR SHELLFISH PROCESSING
Resource /Energy Economics and Policy,
UD Annotatrix: An Annotation Tool For Universal Dependencies
In this paper we introduce the UD Annotatrix annotation tool for manual annotation of Universal Dependencies. This tool has been designed with the aim that it should be tailored to the needs of the Universal Dependencies (UD) community, including that it should operate in fully-offline mode, and is freely-available under the GNU GPL licence. In this paper, we provide some background to the tool, an overview of its development, and background on how it works. We compare it with some other widely-used tools which are used for Universal Dependencies annotation, describe some features unique to UD Annotatrix, and finally outline some avenues for future work and provide a few concluding remarks
The evolutionary state and fundamental parameters of metallic A-F giants
Using Hipparcos parallaxes, we show that the metallic A-F giants found by
Hauck (1986) on the basis of their high Delta m_2 index in Geneva photometry
are on average more evolved than their non-metallic counterparts. Their mass
distribution, rate of binaries and vsini are shown to be incompatible with
those of Am stars, so that they cannot be descendants of the latter. They might
be former normal stars going through a short metal-rich phase at the very end
of their life on the Main Sequence.Comment: 3 pages, 1 figure, to appear in: Proc. of the 26th workshop of the
European Working Group on CP stars, eds. P. North, A. Schnell and J.
Ziznovsky, Contrib. Astr. Obs. Skalnate Pleso Vol. 27, No
Evolution of magnetic fields in stars across the upper main sequence
To properly understand the physics of upper main sequence stars it is
particularly important to identify the origin of their magnetic fields.
Recently, we confirmed that magnetic fields appear in Ap stars of mass below 3
M_sun only if they have already completed at least approximately 30% of their
main-sequence lifetime. The absence of stars with strong magnetic fields close
to the ZAMS might be seen as an argument against the fossil field theories.
Here we present the results of our recent magnetic survey with FORS1 at the VLT
in polarimetric mode of a sample of A, B and Herbig Ae stars with previously
undetected magnetic fields and briefly discuss their significance for our
understanding of the origin of the magnetic fields in intermediate mass stars.Comment: 6 pages, 3 figures, to appear in "Magnetic Fields in the Universe:
From Laboratory and Stars to Primordial Structures", AIP Conference
Proceedings 78
Immersive Visualization Environments for Teaching/Learning
Comparative Study of Brain Activities in Immersive Visualization Environments: An Innovative Pedagogical Technique
Abstract
The primary objective of this work-in-progress is to investigate advanced and innovative pedagogical techniques in teaching and learning STEM concepts by utilizing Immersive Visualization Environments (IVE). Specifically, a comparative study of brain activities was performed to determine effectiveness of different Immersive Visualization Environments in pedagogy. Twelve randomly selected college students participated in this investigation using an electroencephalography (EEG) device for measuring brain waves of the subjects. The preliminary collected data supported the assertion that dome-shaped IVE elicited a more relaxed state than its counterpart, head-mounted IVE, yielding a higher performance.
Audience: College/University Professors
Conference Track: R1 - Work-in-progress
Format of Presentation: Poster Session
Participants\u27 Engagement: N/A
Participants\u27 Gain: Exposure and Knowledge of Immersive Visualization Environment for Teaching/Learning in STEM fields.
Alignment: Objectives of this poster session is directly aligned with the objectives of the conference
Probabilistic models of planetary contamination
Likely fundamental inadequacies in the model of planetary contamination advanced by Sagan and Coleman are discussed. It is shown that a relatively minor modification of the basic Sagan-Coleman formula yields approximations that are generally adequate with data in the range of interest. This approximation formula differs from the original Sagan-Coleman version only through an initial conditioning on landing outcome. It always yields an upper (conservative) bound for the total probability of contamination, this appealing feature is lost if the conditioning on landing outcome is deleted
Impact of traffic management on black carbon emissions: a microsimulation study
This paper investigates the effectiveness of traffic management tools, includ- ing traffic signal control and en-route navigation provided by variable message signs (VMS), in reducing traffic congestion and associated emissions of CO2, NOx, and black carbon. The latter is among the most significant contributors of climate change, and is associated with many serious health problems. This study combines traffic microsimulation (S-Paramics) with emission modeling (AIRE) to simulate and predict the impacts of different traffic management measures on a number traffic and environmental Key Performance Indicators (KPIs) assessed at different spatial levels. Simulation results for a real road network located in West Glasgow suggest that these traffic management tools can bring a reduction in travel delay and BC emission respectively by up to 6 % and 3 % network wide. The improvement at local levels such as junctions or corridors can be more significant. However, our results also show that the potential benefits of such interventions are strongly dependent on a number of factors, including dynamic demand profile, VMS compliance rate, and fleet composition. Extensive discussion based on the simulation results as well as managerial insights are provided to support traffic network operation and control with environmental goals. The study described by this paper was conducted under the support of the FP7-funded CARBOTRAF project
ON THE FACILITATIVE ROLE OF THE ECONOMIST IN ECONOMIC DEVELOPMENT - CASE STUDY OF A GEORGIA SHRIMP HARBOR INVESTMENT
Community/Rural/Urban Development,
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