1,900 research outputs found
The Environmental Kuznets Curve Under a New framework: Role of Social Capital in Water Pollution
We advance a case for an inclusion of social capital in the environmental Kuznets curve analysis using highly disaggregated data on water pollution in Louisiana. A social capital index and other variables are used in parametric and spatial panel regression models to explain water pollution dynamics.Environmental Economics and Policy,
Does Social Capital Have a Role in Environmental Kuznets Curve? Spatial Panel Regression Approach
We advance a case for an inclusion of social capital in the environmental Kuznets curve analysis using highly disaggregated data on water pollution in Louisiana. A social capital index and other variables are used in parametric and spatial panel regression models to explain water pollution dynamics.social capital, principal component analysis, environmental Kuznets curve, spatial regression, Environmental Economics and Policy,
Data-Efficient Policy Selection for Navigation in Partial Maps via Subgoal-Based Abstraction
We present a novel approach for fast and reliable policy selection for
navigation in partial maps. Leveraging the recent learning-augmented
model-based Learning over Subgoals Planning (LSP) abstraction to plan, our
robot reuses data collected during navigation to evaluate how well other
alternative policies could have performed via a procedure we call offline
alt-policy replay. Costs from offline alt-policy replay constrain policy
selection among the LSP-based policies during deployment, allowing for
improvements in convergence speed, cumulative regret and average navigation
cost. With only limited prior knowledge about the nature of unseen
environments, we achieve at least 67% and as much as 96% improvements on
cumulative regret over the baseline bandit approach in our experiments in
simulated maze and office-like environments.Comment: 8 pages, 5 figure
Arp 65 interaction debris: massive HI displacement and star formation
Context: Pre-merger interactions between galaxies can induce significant
changes in the morphologies and kinematics of the stellar and ISM components.
Large amounts of gas and stars are often found to be disturbed or displaced as
tidal debris. This debris then evolves, sometimes forming stars and
occasionally tidal dwarf galaxies. Here we present results from our HI study of
Arp 65, an interacting pair hosting extended HI tidal debris. Aims: In an
effort to understand the evolution of tidal debris produced by interacting
pairs of galaxies, including in situ star and tidal dwarf galaxy formation, we
are mapping HI in a sample of interacting galaxy pairs. The Arp 65 pair is one
of them. Methods: Our resolved HI 21 cm line survey is being carried out using
the Giant Metrewave Radio Telescope (GMRT). We used our HI survey data as well
as available SDSS optical, Spitzer infra-red and GALEX UV data to study the
evolution of the tidal debris and the correlation of HI with the star-forming
regions within it. Results: In Arp 65 we see a high impact pre-merger
interaction involving a pair of massive galaxies (NGC 90 and NGC 93) that have
a stellar mass ratio of ~ 1:3. The interaction, which probably occurred ~ 1.0
-- 2.5 10 yr ago, appears to have displaced a large fraction of
the HI in NGC 90 (including the highest column density HI) beyond its optical
disk. We also find extended ongoing star formation in the outer disk of NGC 90.
In the major star-forming regions, we find the HI column densities to be ~ 4.7
10 cm or lower. But no signature of star formation was
found in the highest column density HI debris, SE of NGC 90. This indicates
conditions within the highest column density HI debris remain hostile to star
formation and it reaffirms that high HI column densities may be a necessary but
not sufficient criterion for star formation.Comment: Accepted in A&
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