Wind Forecasting Based on the HARMONIE Model and Adaptive Finite Elements     

Albert Oliver  Eduardo Rodríguez  José María Escobar  Gustavo Montero  Mariano Hortal  Javier Calvo  José Manuel Cascón  Rafael Montenegro 《Pure and Applied Geophysics》2015,172(1):109-120

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Introduction to Mathematics and Geosciences: Global and Local Perspectives,Volume I     

Rafael Orive  María L. Osete  Jesús I. Díaz  José Fernández 《Pure and Applied Geophysics》2015,172(1):1-5

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The starburst-AGN connection: the role of stellar clusters in AGNs     

R. M. González Delgado  V. M. Muñoz Marín  E. Pérez  H. R. Schmitt  R. Cid Fernandes 《Astrophysics and Space Science》2009,320(1-3):61-67

Nuclear stellar clusters are a common phenomenon in spirals and in starburst galaxies, and they may be a natural consequence of the star formation processes in the central regions of galaxies. HST UV imaging of a few Seyfert 2 galaxies have resolved nuclear starbursts in Seyfert 2 revealing stellar clusters as the main components of the extended emission. However, we do not know whether stellar clusters are always associated with all types of nuclear activity. We present HST NUV and optical images to study the role that stellar clusters play in different types of AGNs. Also with these images, we study the circumnuclear dust morphology as a probe of the circumnuclear environment of AGNs.  相似文献   

The spatial distribution of galaxies within the cosmic microwave background cold spot in the Corona Borealis supercluster     

Carmen Pilar Padilla-Torres  Carlos M. Gutiérrez  Rafael Rebolo  Ricardo Génova-Santos  José Alberto Rubiño-Martin 《Monthly notices of the Royal Astronomical Society》2009,396(1):53-60

We study the spatial distribution and colours of galaxies within the region covered by the cold spot in the cosmic microwave background recently detected by the Very Small Array interpherometer (VSA) towards the Corona Borealis supercluster (CrB-SC). The spot is in the northern part of a region with a radius  ∼1° (∼5 Mpc  at the redshift of CrB-SC) enclosing the clusters Abell 2056, 2065, 2059 and 2073, and where the density of galaxies, excluding the contribution from those clusters, is approximately two times higher than the mean value in typical intercluster regions of the CrB-SC. Two of such clusters (Abell 2056 and 2065) are members of the CrB-SC, while the other two are in the background. This high-density intercluster region is quite inhomogeneous, being the most remarkable feature a large concentration of galaxies in a narrow filament running from Abell 2065 with a length of ∼35 arcmin (  ∼3 Mpc  at the redshift of CrB-SC) in the SW–NE direction. This intercluster population of galaxies probably results from the interaction of clusters Abell 2065 and 2056. The area subtended by the VSA cold spot shows an excess of faint  (21 < r < 22)  and red  (1.1 < r − i < 1.3)  galaxies as compared with typical values within the CrB-SC intercluster regions. This overdensity of galaxies shows a radial dependence and extends out to ∼15 arcmin. This could be the signature of a previously unnoted cluster in the background.  相似文献   

Competitive Learning Approach to GIS Based Land Use Suitability Analysis     

TELLEZ Ricardo Delgado  WANG Shaohua  ZHONG Ershun  CAI Wenwen  LONG Liang 《资源与生态学报(英文版)》2016,7(6):430-438

This paper uses the expected utility under risk hypothesis to develop a new approach to GIS modeling for land use suitability analysis with competitive learning algorithms (CLG-LUSA). It uses Kohonen’s Self Organized Maps (SOM) and Linear Vector Quantization (LVQ) among other tools to create comprehensive ordering of high number of options. The model uses decision makers preferred locations and environmental data to construct a manifold of the decision’s attribute space. Then, decision and uncertainty maps are derived from this manifold. An application example is provided using the selection of suitable environments for coconut development in a municipality of Cuba. CLG-LUSA model was able to provide accurate visual feedback of key aspects of the decision process, making the methodology suitable for personal or group decision making.  相似文献   

Design of optimal ecosystem monitoring networks: hotspot detection and biodiversity patterns     

Matteo Convertino  Rafael Muñoz-Carpena  Gregory A. Kiker  Stephen G. Perz 《Stochastic Environmental Research and Risk Assessment (SERRA)》2015,29(4):1085-1101

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Erratum to: Preface     

Enrique Pérez  Richard de Grijs  Rosa M. González?Delgado 《Astrophysics and Space Science》2010,326(2):325

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Are the magnetic fields of millisecond pulsars ∼108 G?     

Rafael S. de Souza  Reuven Opher 《Astrophysics and Space Science》2010,330(2):267-271

It is generally assumed that the magnetic fields of millisecond pulsars (MSPs) are ～10⁸ G. We argue that this may not be true and the fields may be appreciably greater. We present six evidences for this: (1) The ～10⁸G field estimate is based on magnetic dipole emission losses which is shown to be questionable; (2) The MSPs in low mass X-ray binaries (LMXBs) are claimed to have <10¹¹ G on the basis of a Rayleygh-Taylor instability accretion argument. We show that the accretion argument is questionable and the upper limit 10¹¹ G may be much higher; (3) Low magnetic field neutron stars have difficulty being produced in LMXBs; (4) MSPs may still be accreting indicating a much higher magnetic field; (5) The data that predict ～10⁸ G for MSPs also predict ages on the order of, and greater than, ten billion years, which is much greater than normal pulsars. If the predicted ages are wrong, most likely the predicted ～10⁸ G fields of MSPs are wrong; (6) When magnetic fields are measured directly with cyclotron lines in X-ray binaries, fields ?10⁸ G are indicated. Other scenarios should be investigated. One such scenario is the following. Over 85% of MSPs are confirmed members of a binary. It is possible that all MSPs are in large separation binaries having magnetic fields >10⁸ G with their magnetic dipole emission being balanced by low level accretion from their companions.  相似文献   

Free and Open Source Software for Geospatial Applications (FOSS4G): A Mature Alternative in the Geospatial Technologies Arena   总被引：1，自引：0，他引：1  

Rafael Moreno‐Sanchez 《Transactions in GIS》2012,16(2):81-88

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Assessment of nitrate contamination risk: The Italian experience     

E. Capri  M. Civita  A. Corniello  G. Cusimano  M. De Maio  D. Ducci  G. Fait  A. Fiorucci  S. Hauser  A. Pisciotta  G. Pranzini  M. Trevisan  A. Delgado Huertas  F. Ferrari  R. Frullini  B. Nisi  M. Offi  O. Vaselli  M. Vassallo 《Journal of Geochemical Exploration》2009

The purpose of this study is to show the results of the Italian research project of national interest (PRIN) launched in 2006 and finished in 2008, concerning the “assessment of groundwater contamination risk by nitrates assessment”. The project verified the IPNOA method for nitrate groundwater contamination risk assessment in four test-sites of Italy. The IPNOA is a parametric index which assesses the potential hazard of nitrate contamination originating from agriculture on a regional scale. The method integrates two categories of parameters: the hazard factors (HF), which represent all farming activities that cause, or might cause, an impact on soil quality in terms of nitrate (use of fertilisers, application of livestock and poultry manure, food industry wastewater and urban sludge), and the control factors (CF) which adapt the hazard factors to the characteristics of the site (geographical location, climatic conditions and agronomic practices). Finally, the Potential Risk Map is obtained by coupling the potential hazard of nitrate pollution (IPNOA) and the aquifer Contamination Vulnerability Map. The project was carried out by five Research Units (RU) from the Politecnico di Torino, Universities of Piacenza, Florence, Naples and Palermo. The geochemistry of groundwaters from the four test-sites was studied to determine the distribution of nitrate, and to evaluate groundwater chemical facies. All the study areas are affected by groundwater nitrate contamination and often by hydrogeochemical peculiarities. In some cases isotopic study, δ¹⁸O–NO₃δ¹⁵N–NO₃, allowed to differentiate nitrates of chemical fertilisers from those of biological origin, as well as denitrification processes.  相似文献