8,379 research outputs found
Modeling Sensor Knowledge of a National Hydrologic Information System
In this paper we describe our experience in modeling and using sensor knowledge of a national hydrologic information system in Spain. We developed a web application called VSAIH supported by a knowledge-based system to analyze sensor data and to generate explanations that help users to make decisions based on hydrologic behavior. In the paper, we describe the characteristics of the infrastructure of hydrologic sensors and the representa-tion we used to model sensor knowledge to provide support to the VSAIH application. We also describe semi-automatic procedures that we applied to construct the final model
Probabilistic localization of gas emission areas with a mobile robot in indoor environments
This work deals with the problem of gas source localization by a mobile robot with gas-sensing capabilities. Particularly, we address the problem for the case of indoor environments, where the presence of obstacles and the possibly complex
structure with multiple rooms, inlets and outlets provoke the chaotic dispersion of the gases. Under these challenging conditions, where traditional approaches based on tracking or mathematical modeling of the plume cannot be applied, we propose a two-stage methodology to split the search into coarse and fine localization. Focusing on the broad localization, we contribute with a novel approach to estimate, from a set of sparse observations, the likelihood of different regions in the environment to hold a gas source. Experiments demonstrate that our approach is suitable to locate gas emission sources.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech
A unified pseudo- framework
The pseudo- is an algorithm for estimating the angular power and
cross-power spectra that is very fast and, in realistic cases, also nearly
optimal. The algorithm can be extended to deal with contaminant deprojection
and purification, and can therefore be applied in a wide variety of
scenarios of interest for current and future cosmological observations. This
paper presents NaMaster, a public, validated, accurate and easy-to-use software
package that, for the first time, provides a unified framework to compute
angular cross-power spectra of any pair of spin-0 or spin-2 fields,
contaminated by an arbitrary number of linear systematics and requiring - or
-mode purification, both on the sphere or in the flat-sky approximation. We
describe the mathematical background of the estimator, including all the
features above, and its software implementation in NaMaster. We construct a
validation suite that aims to resemble the types of observations that
next-generation large-scale structure and ground-based CMB experiments will
face, and use it to show that the code is able to recover the input power
spectra in the most complex scenarios with no detectable bias. NaMaster can be
found at https://github.com/LSSTDESC/NaMaster, and is provided with
comprehensive documentation and a number of code examples.Comment: 27 pages, 17 figures, accepted in MNRAS. Code can be found at
https://github.com/LSSTDESC/NaMaste
Heat asymmetries in nanoscale conductors: The role of decoherence and inelasticity
We investigate the heat flow between different terminals in an interacting
coherent conductor when inelastic scattering is present. We illustrate our
theory with a two-terminal quantum dot setup. Two types of heat asymmetries are
investigated: electric asymmetry , which describes deviations of the
heat current in a given contact when voltages are exchanged, and contact
asymmetry , which quantifies the difference between the power
measured in two distinct electrodes. In the linear regime, both asymmetries
agree and are proportional to the Seebeck coefficient, the latter following at
low temperature a Mott-type formula with a dot transmission renormalized by
inelasticity. Interestingly, in the nonlinear regime of transport we find
and this asymmetry departure depends on the applied bias
configuration. Our results may be important for the recent experiments by Lee
et al. [Nature (London) 498, 209 (2013)], where these asymmetries were
measured.Comment: 9 pages, 5 figures. Minor changes; published versio
Economic Polarization Through Trade: Trade Liberalization and Regional Growth in Mexico
economic growth, regional disparities, trade, integration, polarization, Mexico
- …