Ideas for the Provision of Ontology Access in Grid Environments

Ontologies are the backbone of the Semantic Web. Current grid architectures do not consider their usage, and there are no protocols nor standards in the Grid community for dealing with them. Therefore, the provision of appropriate means for accessing, querying and using ontologies effectively is a key factor if we want to enrich the current grid with semantic technologies and to support progress towards the next generation Grid, that is, the Semantic Grid

Abundance of LIGO/Virgo Black Holes from Microlensing Observations of Quasars with Reverberation Mapping Size Estimates

We thank the anonymous referees for ideas and comments that greatly contributed to enhancing the scope of our paper. This research was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) with grants AYA2016-79104-C3-1-P and AYA2016-79104-C3-3-P and projects PID2020-118687GB-C33, PID2020-118687GB-C32, and PID2020-118687GB-C31, financed by MCIN/AEI/10.13039/501100011033. J.J.V. is supported by project AYA2017-84897-P, financed by the Spanish MINECO and by the Fondo Europeo de Desarrollo Regional (FEDER), and by projects FQM-108, P20_00334 and A-FQM-510-UGR20/FEDER, financed by Junta de Andalucia. A.E.G. is grateful for the support from grant FPI-SO from the Spanish MINECO (research project SEV-2015-0548-17-4 and predoctoral contract BES-2017-082319).Assuming a population of black holes (BHs) with masses in the range inferred by LIGO/Virgo from BH mergers, we use quasar microlensing observations to estimate their abundances. We consider a mixed population of stars and BHs and the presence of a smooth dark matter component. We adopt reverberation mapping estimates of the quasar size. According to a Bayesian analysis of the measured microlensing magnifications, a population of BHs with masses similar to 30M (circle dot) constitutes less than 0.4% of the total matter at the 68% confidence level (less than 0.9% at the 90% confidence level). We have explored the whole mass range of LIGO/Virgo BHs, finding that this upper limit ranges from 0.5% to 0.4% at the 68% confidence level (from 1.1% to 0.9% at the 90% confidence level) when the BH masses change from 10 to 60M (circle dot). We estimate a 16% contribution from the stars, in agreement with previous studies based on a single-mass population that do not explicitly consider the presence of BHs. These results are consistent with the estimates of BH abundances from the statistics of LIGO/Virgo mergers, and rule out primordial BHs (or any other types of compact object) in this mass range constituting a significant fraction of the dark matter.Spanish Ministry of Economy and Competitiveness (MINECO) - MCIN/AEI AYA2016-79104-C3-1-P AYA2016-79104-C3-3-P PID2020-118687GB-C33 PID2020-118687GB-C32 PID2020-118687GB-C31Spanish Government AYA2017-84897-P SEV-2015-0548-17-4 BES-2017-082319European CommissionSpanish Government AYA2017-84897-PJunta de Andalucia FQM-108 P20_00334 A-FQM-510-UGR20/FEDE

Limiting the Abundance of LIGO/Virgo Black Holes with Microlensing Observations of Quasars of Finite Size

We thank the anonymous referee for ideas and comments, which greatly contributed to enhancing the scope of our paper. This research was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) with the grants AYA2016-79104-C3-1-P and AYA2016-79104-C3-3-P. J.J.V. is supported by the project AYA2017-84897-P financed by MINECO and by the Fondo Europeo de Desarrollo Regional (FEDER), and by projects FQM-108, P20_00334, and A-FQM-510-UGR20/FEDER financed by Junta de Andalucia. A.E.G. thanks the support from grant FPI-SO from MINECO (research project SEV-2015-0548-17-4 and predoctoral contract BES-2017-082319).We present a simple but general argument that strongly limits the abundance of primordial black holes (PBHs) (or other unknown population of compact objects) with masses similar to those determined by LIGO/Virgo from BH binary mergers. We show that quasar microlensing can be very sensitive to the mass of the lenses, and that it is able to distinguish between stars and BHs of high mass, when the finite size of the source is taken into account. A significant presence of massive BHs would produce frequent high-flux magnifications (except for unrealistically large sources), which have been very rarely observed. On the contrary, a typical stellar population would induce flux magnifications consistent with the observations. This result excludes PBHs (or any type of compact object) in the mass range determined by LIGO/Virgo as the main dark matter constituents in the lens galaxies.Spanish Government AYA2016-79104-C3-1-P AYA2016-79104-C3-3-P AYA2017-84897-PEuropean CommissionSpanish GovernmentJunta de Andalucia FQM-108 P20_00334 A-FQM-510-UGR20/FEDERgrant FPI-SO from MINECO SEV-2015-0548-17-4 BES-2017-08231

Executing Evaluations over Semantic Technologies using the SEALS Platform

The SEALS European project aims to develop an infrastructure for the evaluation of semantic technologies. This paper presents in detail the approach followed to automate the execution of these evaluations in the infrastructure. To materialize this approach, we have dened the entities managed by the infrastructure and their life cycle, the process followed to execute evaluations, the management of the computing resources that form the execution infrastructure, and how tools can be integrated with the infrastructure

Towards an Infrastructure for the Evaluation of Semantic Technologies

This paper presents and discusses the current development status of the SEALS Platform, a lasting reference infrastructure for semantic technology evaluation. It describes the different entities managed by the platform and the ontology-based model that has been defined to represent them; it also provides an overview of the platform architecture. In addition, it presents the different challenges faced during the development of the SEALS Platform and a use scenario of the platform that supports the execution of evaluation campaigns over semantic technologies

Ontology Access in Grid Environments with WS-DAIOnt and the RDF(S) Realization

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Constraints on the Abundance of PBHs from X-ray Quasar Microlensing Observations: Substellar to Planetary Mass Range

We use X-ray observations of quasar microlensing (sensitive to smaller compact objects than in the optical) to study the possible presence of a population of low mass black holes (from $\sim$ $10^{-3}M_{\odot}$ to $10^{-1}M_{\odot}$) in lens galaxies. We compare these observations with microlensing magnification simulations of a mixed population of stars and black holes (BHs) plus a smooth matter component. We estimate the individual mass fractions of both, stars and BHs, for three different BH masses in the range of substellar to planetary masses. Our Bayesian analysis indicates that the contribution of BHs is negligible in the substellar mass range but that a population of BHs of planetary mass (M $\lesssim$ $10^{-3}M_{\odot}$) could pass unnoticed to X-ray microlensing. We provide new upper limits to the contribution of BHs to the fraction of dark matter based on both, the quasar microlensing data in the X-ray band, and our previous estimates in the optical of intermediate-mass BHs with an additional upper limit at $M=3M_{\odot}$.Comment: 11 pages, 3 figure

Ontology Access in Grids with WS-DAIOnt and the RDF(S) Realization

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Accessing RDF(S) data resources in service-based Grid infrastructures

We describe the results of the RDF(S) activity within the Open Grid Forum (http://www.ogf.org) (OGF) Database Access and Integration Services (DAIS) Working Group (http://forge.gridforum.org/projects/dais-wg) whose objective is to develop standard service-based grid access mechanisms for data expressed in RDF and RDF Schema. We produce two specifications, focused on the provision of SPARQL querying capabilities for accessing RDF data and a set of RDF Schema ontology handling primitives for creating, retrieving, updating, and deleting RDF data. In this paper we present a set of use cases that justify this work and an overview of these specifications, which will enter in editorial process at OGF25. We conclude by outlining the future work that will be made in the context of this standardization process

Estimation of genetic parameters for cheese-making traits in Spanish Churra sheep

Artículo de investigaciónThe global production of sheep milk is growing, and the main industrial use of sheep milk is cheese making. The Spanish Churra sheep breed is one of the most important native dairy breeds in Spain. The present study aimed to estimate genetic parameters for a wide range of traits influencing the cheese-making ability of Churra sheep milk. Using a total of 1,049 Churra ewes, we studied the following cheese-making traits: 4 traits related to milk coagulation properties (rennet coagulation time, curd-firming time, and curd firmness at 30 and 60 min after addition of rennet), 2 traits related to cheese yield (individual laboratory cheese yield and individual laboratory dried curd yield), and 3 traits measuring curd firmness over time (maximum curd firmness, time to attain maximum curd firmness, and syneresis). In addition, a list of milk traits, including the native pH of the milk and several milk production and composition traits (milk yield; the fat, protein, and dried extract percentages; and the somatic cell count), were also analyzed for the studied animals. After discarding the noncoagulating samples (only 3.7%), data of 1,010 ewes were analyzed with multiple-trait animal models by using the restricted maximum likelihood method to estimate (co)variance components, heritabilities, and genetic correlations. In general, the heritability estimates were low to moderate, ranging from 0.08 (for the individual laboratory dried curd yield trait) to 0.42 (for the fat percentage trait). High genetic correlations were found within pairs of related traits (i.e., 0.93 between fat and dried extract percentages, −0.93 between the log of the curd-firming time and curd firmness at 30 min, 0.70 between individual laboratory cheese yield and individual laboratory dried curd yield, and −0.94 between time to attain maximum curd firmness and syneresis). Considering all the information provided here, we suggest that in addition to the current consideration of the protein percentage trait for improving cheese yield traits, the inclusion of the pH of milk as a measured trait in the Churra dairy breeding program would represent an efficient strategy for improving the cheese-making ability of milk from this breed.S