10,082 research outputs found
Smart and networking underwater robots in cooperation meshes : the swarms ECSEL : H2020 project
The work presented on this paper is aimed to explain the role that
unmanned underwater vehicles (AUVs/ROVs) plays in the ECSEL-H2020 SWARMS
project. The main goal of the project is to reduce the operational cost and increase
the safety of tasks assigned to divers in these operations. This will be achieved
enabling the AUVs/ROVs to work in a cooperative mesh. The challenge is to design
and develop an integrated platform (a set of Software/Hardware components),
incorporated into the current generation of underwater vehicles in order to
improve autonomy, cooperation, robustness, cost-effectiveness, and reliability of
the offshore operations. The first demonstration of the project will be performed at
PLOCAN (Oceanic Platform of the Canary Islands) where these technologies will be
validated on its first stage.Peer Reviewe
Comprehensive study of Leon-Queretaro area
There are no author-identified significant results in this report
Effects of Additives upon Percolation Temperature in AOT-Based Microemulsions
In the present review the percolative phenomena has been analyzed. Percolation is related to transport phenomena in microemulsions, in particular the electric charge transport. The influence of different additives upon electric percolation has been commented. The effects of the additives considered upon the microemulsion properties appear to come about through their association with the surfactant interface. The effects of these agents on the ease with which interdroplet channels allowing transfer of droplet contents are formed are not only responsible for their effects on percolation temperature, but also have serious implications for the rates of fast chemical reactions performed in microemulsions
Gypsum-DL: an open-source program for preparing small-molecule libraries for structure-based virtual screening
Computational techniques such as structure-based virtual screening require carefully prepared 3D models of potential small-molecule ligands. Though powerful, existing commercial programs for virtual-library preparation have restrictive and/or expensive licenses. Freely available alternatives, though often effective, do not fully account for all possible ionization, tautomeric, and ring-conformational variants. We here present Gypsum-DL, a free, robust open-source program that addresses these challenges. As input, Gypsum-DL accepts virtual compound libraries in SMILES or flat SDF formats. For each molecule in the virtual library, it enumerates appropriate ionization, tautomeric, chiral, cis/trans isomeric, and ring-conformational forms. As output, Gypsum-DL produces an SDF file containing each molecular form, with 3D coordinates assigned. To demonstrate its utility, we processed 1558 molecules taken from the NCI Diversity Set VI and 56,608 molecules taken from a Distributed Drug Discovery (D3) combinatorial virtual library. We also used 4463 high-quality protein-ligand complexes from the PDBBind database to show that Gypsum-DL processing can improve virtual-screening pose prediction. Gypsum-DL is available free of charge under the terms of the Apache License, Version 2.0
Non integrability of a self-gravitating Riemann liquid ellipsoid
We prove that the motion of a triaxial Riemann ellipsoid of homogeneous
liquid without angular momentum does not possess an additional first integral
which is meromorphic in position, impulsions, and the elliptic functions which
appear in the potential, and thus is not integrable. We prove moreover that
this system is not integrable even on a fixed energy level hypersurface.Comment: 14 pages, 8 reference
Variation of the Chlorophyll a Related to Sea Surface Temperature, Wind and Geostrophic Currents in the Cape Verde Region Using Satellite Data
We present a comparative analysis of satellite derived climatologies in the Cape Verde
region (CV). In order to establish chlorophyll a variability, in relation to other oceanographic
phenomena, a set of, relatively long (from five to eight years), time series of chlorophyll a, sea
surface temperature, wind and geostrophic currents, were ensembled for the Eastern Central
Atlantic (ECA). We studied seasonal and inter-annual variability of phytoplankton concentration,
in relation to the rest of the variables, with a special focus in CV. We compared the situation within
the archipelago with those of the surrounding marine environments, such as the North West African
Upwelling (NWAU), North Atlantic Subtropical Gyre (NASTG), North Equatorial Counter Current
(NECC) and Guinea Dome (GD). At the seasonal scale, CV region behaves partly as the
surrounding areas, nevertheless, some autochthonous features were also found. The maximum peak
of the pigment having a positive correlation with temperature is found at the end of the year for all
the points in the archipelago; a less remarkable rise with negative correlation is also detected in
February for points CV2 and CV4. This is behavior that none of the surrounding environments
have shown. This enrichment was found to be preceded by a drastic drop in wind intensity (SW
Monsoon) during summer months. The inter-annual analysis shows a tendency for decreasing of
the chlorophyll a concentration.Utilizando séries temporais (entre cinco e oito anos) de dados de satélite a grande escala
para a zona de Cabo Verde (CV), faz-se uma análise da variabilidade da clorofila a relacionando-a
com outros parâmetros oceanográficos como a temperatura superficial do mar, o vento e as
correntes geostróficas. Estuda-se a variabilidade estacional e interanual da concentração do
fitoplancton em relação ao resto das variáveis comparando a situação nas águas de Cabo Verde
com o ambiente marinho à volta do arquipélago como o Upwelling Nordeste Africano (NWAU), o
Giro Subtropical Norte-Atlântico (NASTG), a Contra Corrente Norte-Equatorial (NECC) e o Domo
da Guiné (GD). À escala estacional, a zona de Cabo Verde comporta-se como parte das regiões
envolventes, no entanto, algumas caracterÃsticas autóctonas foram também encontradas. O pico
máximo do pigmento mostrando uma correlação positiva com a temperatura foi encontrado no final
do ano em todos os pontos eulerianos definidos para o arquipélago; um incremento menos notável,
e com uma correlação negativa, também é detectada nos pontos CV2 e CV4. Este comportamento
não foi visto em nenhum dos pontos do ambiente circundante ao arquipélago. O enriquecimento no
final do ano foi precedido por um drástico decréscimo na intensidade do vento (Monsão do SW)
durante os meses de verão. A análise interanual mostra uma tendência para o decréscimo da
concentração da clorofila a
Comprehensive transient-state study for CARMENES-NIR high thermal stability
CARMENES has been proposed as a next-generation instrument for the 3.5m Calar
Alto Telescope. Its objective is finding habitable exoplanets around M dwarfs
through radial velocity measurements (m/s level) in the near-infrared.
Consequently, the NIR spectrograph is highly constraint regarding
thermal/mechanical requirements. As a first approach, the thermal stability has
been limited to \pm 0.01K (within year period) over a working temperature of
243K. This can be achieved by means of several temperature-controlled rooms.
The options considered to minimise the complexity of the thermal design are
here presented, as well as the transient-state thermal analyses realised to
make the best choice
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