1,691 research outputs found

    Standardizing Process-Data Exploitation by Means of a Process-Instance Metamodel

    Get PDF
    The analysis of data produced by the enterprises during pro cesses execution is key to know how these processes are working and how they can be improved. These data may be consumed to make different types of analysis, for example, data could be used as input for process dis covery, decision-making and even process querying tools. However, each type of analysis needs data in different formats because they use different techniques and tackle the problem from a different point of view. Fortu nately, if we look at the data exploitation problem from a higher level of abstraction perspective, we can realize that all the points of view share a common ground: the business process model and its instantiation are in the kernel of all of them. In this paper, we propose the use of a Busi ness Process Instance Metamodel, which serves as a common interface to make independent the applications producing business process data from those applications that consume and exploit it. A tool has been implemented as a proof of concept to facilitate the matching between data from different data sources and the metamodel.Ministerio de Ciencia y Tecnología TIN2015-63502-C3-2-RMinisterio de Ciencia y Tecnología TIN2016-75394-

    Paleohydrological dynamics in the Western Mediterranean during the last glacial cycle

    Get PDF
    This study was supported by the project B-RNM-144-UGR18 of the action "Proyectos I+D+i del Programa Operativo FEDER 2018 -Junta de Andalucia-UGR", the projects CGL2013-47038-R and CGL201785415-R, of the "Ministerio de Economia y Competitividad of Spain and Fondo Europeo de Desarrollo Regional FEDER", and the research group RNM-190 (Junta de Andalucia). A.G.-A. was also supported by a Marie Curie Intra-European Fellowship of the 7th Framework Programme for Research, Technological Development and Demonstration of the European Commission (NAOSIPUK. Grant Number: PIEF-GA-2012-623027) and by a Ram ' on y Cajal Fellowship RYC-2015-18966 of the Spanish Government (Ministerio de Economia y Competividad). J.C. acknowledges the postdoctoral funding provided by the Academy of Finland (project number 316702). J.L.T. hosted the NAOSIPUK project (PIEFGA-2012-623027) at the University of Glasgow. A.L.-A PhD is funded by BES-2018-084293 (Ministerio de Economia y Competividad). M.J.R.R. acknowledges the postdoctoral funding by the European Research Council (ERC-2017-ADG-788616). This study was supported by an ERC Consolidator Grant (STEEPclim) to D.S. (Grant Agreement No. 647035). E.S. is supported by the DFG Cluster of Excellence 2077 >The Ocean Floor -Earth's Uncharted Interface < at MARUM. We thank Ralph Kreutz for analytical support.The transitional regions between the low and high latitudes of the Northern Hemisphere are highly vulnerable to future climate change yet most of the current climate models usually diverge in their projections. To better understand the dynamics in these regions, the reconstruction of past hydrological fluctuations and precipitation patterns is of paramount importance to accurately constrain present and future climate scenarios. In this study, we investigated paleohydrological dynamics in the western Mediterranean region, a transitional zone between low-mid latitudes and Atlantic - Mediterranean realms. We reconstruct precipitation and moisture source changes during the last -35 ka in order to propose the potential mechanisms driving these oscillations. To do so, we use hydrogen isotopes from sedimentary leaf waxes, more specifically the C31 n-alkane homologue, and a precipitation proxy based on previously published pollen data from a sedimentary core (Padul-15-05) in southern Iberia (Padul wetland -37-N). With this combination we disentangle the coupled effect of precipitation amount and source on the hydrogen isotopic signature of the studied C31 n-alkane record. Our results show three main periods characterized by different precipitation patterns. Low precipitation, mainly linked to a significant contribution from an isotopically-enriched Mediterranean precipitation source, occurred from -30 to -15.5 ka BP and during the last -5 ka, whereas enhanced precipitation with a predominant isotopically-depleted Atlantic precipitation source prevailed from -15.5 to -5 ka BP. This latter stage is here defined as the Western Mediterranean Humid Period (WMHP). In addition, some occasional millennial-scale opposite precipitation patterns can be observed during these climatically distinct periods. These changes in the source of precipitation were likely coupled to a shift in the main rainy season from winter, when Atlantic precipitation prevailed, to late winter-early spring, when the contribution of Mediterranean moisture is higher. Comparison between the studied mid-latitude terrestrial Padul-15-05 core and a low-latitude marine record offshore of northwestern Africa shows clear long-term synchronous responses of both western Mediterranean precipitation and western African monsoon systems to northern Hemisphere atmospheric dynamics, ultimately controlled by orbital forcing and ice-sheets fluctuations.action "Proyectos I+D+i del Programa Operativo FEDER 2018 -Junta de Andalucia-UGR" B-RNM-144-UGR18Ministerio de Economia y Competitividad of Spain CGL2013-47038-R CGL201785415-RJunta de Andalucia RNM-190Marie Curie Intra-European Fellowship of the 7th Framework Programme for Research, Technological Development and Demonstration of the European Commission (NAOSIPUK) PIEF-GA-2012-623027Spanish Government (Ministerio de Economia y Competividad) RYC-2015-18966Academy of FinlandEuropean Commission 316702NAOSIPUK project at the University of Glasgow PIEFGA-2012-623027Ministerio de Economia y Competividad BES-2018-084293European Research Council (ERC)European Commission ERC-2017-ADG-788616ERC Consolidator Grant (STEEPclim) 647035DFG Cluster of Excellence 2077 >The Ocean Floor -Earth's Uncharted Interface < at MARUMEuropean Commissio

    Climatic control on the Holocene hydrology of a playa-lake system in the western Mediterranean

    Get PDF
    This study was supported by the action "Proyectos I + D + i del Programa Operativo FEDER 2018-Junta de Andalucia-UGR"& nbsp;[grant number B-RNM-144-UGR] , the Spanish Government (Ministerio de Economia y Competividad) and the European Regional Development Fund (ERDF-FEDER) [grant numbers CGL2013-47038-R and CGL2017- 85415-R] , and the Junta de Andalusia [grant numbers P18-RT-871 and Retos P20_00059, and research group RNM-190] . A.G.-A. was supported by a Ramon y Cajal Fellowship RYC of the Spanish Government (Ministerio de Economia y Competividad) [grant number 2015-18966] . A.L.-A PhD was funded by a fellowship of the Spanish Government (Ministerio de Economia y Competividad) [grant number BES-2018-084293] . F.G was financially supported by a Ramon y Cajal Fellowship (RYC2020-029811-I) of the Spanish Government (Ministerio de Economia y Competividad) . The Open Access Publication Charge was funded by the University of Granada/CBUA.Evaporitic lakes such as playa-lakes are characteristic of many arid regions and are unique environments with respect to fauna and flora, while being very vulnerable to climate and environmental fluctuations and threatened by the current global change scenario. Water balance oscillations in these systems can trigger the precipitation or dissolution of different evaporitic minerals, negatively impacting local biodiversity and economic activities. Here, we study the sedimentary record of a small saline pond from a playa-lake complex in southwestern Iberia in order to reconstruct the paleohydrological evolution of this area and assess potential anthropogenic disturbances. The different proxies studied in the ~11.9 ky old sedimentary record of the Laguna de la Ballestera suggest that the greatest lake extension and the highest water levels occurred during the Early Holocene, pointing to the wettest period of the record. Climate transitioned towards more arid conditions during the Middle Holocene, and even more dramatically during the Late Holocene. In this last stage the wetland surface and the water level largely diminished and gypsum precipitation gradually increased pointing towards a negative precipitation/ evapotranspiration balance and lowest water levels. Summer desiccation likely occurred under this scenario, especially after ~1.0–0.9 cal ky BP coeval with the Medieval Climate Anomaly, when gypsum content started to rise abruptly. However, this significant gypsum precipitation was only associated with a massive drop in the siliciclastic content and scarce carbonates (dolomite and calcite) during the last ~400 years. This evidence suggests a shift from a (semi) permanent to a temporal/seasonal hydrological regime. The environmental evolution of this wetland responded to the general climatic evolution of the western Mediterranean during the Holocene, being mostly controlled by changes in insolation. Our data also show that the environmental response of the studied wetland to natural climate variations was only significantly disturbed by human activities since the 20th century, especially in the second half of the century, deduced by abrupt fluctuations in the siliciclastic, gypsum and organic content in the sediments, as well as by the enhanced sedimentary accumulation rates, probably as a response to changes in the hydroperiod of the lake and in the catchment land use.Spanish Government B-RNM-144-UGRProyectos I + D + i del Programa Operativo FEDER 2018-Junta de Andalucia-UGR B-RNM-144-UGRSpanish Government RNM-190European Commission B-RNM-144-UGR BES-2018-084293Junta de Andalusia CGL2013-47038-R CGL2017- 85415-R P18-RT-871Ramon y Cajal Fellowship RYC of the Spanish Government (Ministerio de Economia y Competividad) Retos P20_00059 2015-18966University of Granada/CBUA RYC 2020-029811-

    Diseño de relleno sanitario para la disposición final de residuos sólidos urbanos en el municipio de Ocotal, departamento de nueva Segovia

    Get PDF
    Presenta el diseño de relleno sanitario para la disposición final de residuos sólidos urbanos en el municipio de Ocotal, departamento de nueva Segovia en el cual se realizó la caracterización de los residuos sólidos domiciliares así como la propuesta de alternativas de recolección y transporte de los mismo considerando el desarrollo urbanístico de la sociedad

    Vagus nerve stimulation in patients with migraine

    Full text link
    ntroducción. La estimulación del nervio vago (ENV) está aprobada para el tratamiento de la epilepsia refractaria cuando no es posible cirugía resectiva, con una eficacia bien establecida. Series publicadas sugieren un efecto beneficioso de la ENV en la migraña. Objetivos. Determinar el grado de mejoría de la cefalea en pacientes migrañosos a los que se les había implantado una ENV para tratamiento de la epilepsia refractaria y evaluar qué variables se asocian a mayor posibilidad de éxito con esta medida. Pacientes y métodos. Estudio observacional y retrospectivo desde el 1 de enero de 1999 hasta el 31 de diciembre de 2010. Se contactó telefónicamente con los pacientes con ENV para epilepsia refractaria, seleccionando a aquéllos que cumplían los criterios de la Sociedad Internacional de Cefaleas para la migraña. Se recogieron edad, género, año de implantación, edad de inicio de la epilepsia y la migraña, mejoría de crisis y de migraña, presencia de aura migrañosa y coexistencia de síndrome ansiosodepresivo. Se contactó con 94 pacientes con ENV y se seleccionó a 13 pacientes migrañosos. Resultados. Tras la implantación de la ENV, se observó una disminución de al menos el 50% de los episodios de migraña en nueve pacientes (69%) (p = 0,004), así como una disminución del número de episodios de migraña en aquellos pacientes que también habían reducido sus crisis epilépticas (p = 0,012). No se observaron asociaciones estadísticamente significativas en cuanto al sexo, edad, tiempo de evolución, existencia de aura migrañosa o coexistencia de síndrome ansiosodepresivo. Conclusiones. La ENV podría resultar beneficiosa en pacientes con migraña, especialmente en casos de difícil control. Debido al tipo estudio, hay que tomar estas conclusiones con precaución. Serán necesarios estudios clínicos prospectivos antes de llevarse a la práctica clínica habitualIntroduction. Vagus nerve stimulation (VNS) has been approved for the treatment of refractory epilepsy when resective surgery is not possible, and has proved to be highly effective. Series published in the literature suggest a beneficial effect of VNS in the treatment of migraine. Aims. To determine the degree to which headaches improve in patients with migraine after the placement of VNS to treat refractory epilepsy, and to evaluate what variables are associated with an increased chance of success with this measure. Patients and methods. An observation-based retrospective study was conducted from 1st January 1999 until 31st December 2010. Patients with VNS for refractory epilepsy were contacted by telephone, after selecting those who fulfilled International Headache Society criteria for migraine. Data collected included age, gender, year of placement, age at onset of epilepsy and migraine, improvement of seizures and migraine, presence of migraine with aura and coexistence of anxious-depressive syndrome. Ninety-four patients with VNS were contacted and 13 patients with migraine were selected. Results. Following placement of the VNS, the number of episodes of migraine was seen to decrease by at least 50% in nine patients (69%) (p = 0.004) and there was a drop in the number of episodes of migraine in those patients who had also reduced their epileptic seizures (p = 0.012). No statistically significant associations were observed as regards sex, age, length of disease history, existence of migraine with aura or coexistence of anxious-depressive syndrome. Conclusions. VNS could have beneficial effects for patients with migraine, especially in cases that are difficult to control. Due to the type of study, these conclusions must be taken with caution. Prospective clinical studies are needed before introducing the technique into daily clinical practic

    Compact Modeling of Multi-layered MoS2 FETs including Negative Capacitance Effect

    Get PDF
    Abstract—In this paper, we present a channel thickness dependent analytical model for MoS2 symmetric double-gate FETs including negative capacitance (NC) effect. In the model development, first thickness dependent model of the baseline 2D FET is developed, and later NC effect is included in the model using the Landau-Khalatnikov (L-K) relation. To validate baseline model behavior, density functional theory (DFT) calculations are taken into account to obtain numerical data for the K and valley dependent effective masses and differences in the energy levels of N-layer (N = 1, 2, 3, 4, and 5) MoS2. The calculated layer dependent parameters using DFT theory are further used in a drift-diffusion simulator to obtain electric characteristics of the baseline 2D FET for model validation. The model shows excellent match for drain current and total gate capacitance of baseline FET and NCFET against the numerical simulation. Index Terms—Metal-oxide-semiconductor field-effect transistor (MOSFET), Compact modeling, molybdenum disulfide (MoS2), transition metal dichalcogenide (TMD), Double Gate (DG), Negative Capacitance FET (NCFET).Swarnajayanti FellowshipFIST Scheme of Department of Science and Technology (DST), Government of IndiaSpanish Government Grant FPU16/04043Juan de la Cierva Incorporación (MINECO/AEI) IJCI-2017-3229

    Modelización numérica de la movilización de partículas en gases

    Get PDF
    En el presente artículo se presenta una descripción de la problemática relacionada con la presencia de partículas de polvo en el proyecto internacional del reactor experimental de fusión nuclear, ITER, frente a posibles accidentes que podrían llegar a darse. Uno de estos sucesos hipotéticos consiste en la movilización y combustión de partículas por la presurización repentina del reactor. Para el análisis de este problema, como paso previo a la realización del proyecto, se describe el modelo matemático de mezclas altamente diluidas, que se ha planteado para la modelización numérica del problema y para su posterior resolución mediante diferentes esquemas de discretización.Asociación de Jóvenes Investigadores de Cartagena, (AJICT). Universidad Politécnica de Cartagena. Escuela Técnica Superior de Ingeniería Industrial UPCT, (ETSII). Escuela Técnica Superior de Ingeniería Agronómica, (ETSIA), Escuela Técnica Superior de Ingeniería de Telecomunicación (ETSIT). Escuela de Ingeniería de Caminos, Canales, y Puertos y de Ingeniería de Minas, (EICM). Fundación Séneca, Agencia Regional de Ciencia y Tecnología. Parque Tecnológico de Fuente Álamo. Grupo Aquilin

    Laguna Seca sediments reveal environmental and climate change during the latest Pleistocene and Holocene in Sierra Nevada, southern Iberian Peninsula

    Get PDF
    This study was supported by the I + D + i projects CGL2013-47038- R, CGL2017-85415-R, PID2019-1049449GB-I00, and PID2021- 125619OB-C21/C22 funded by Ministerio Ciencia e Innovación/Agencia Estatal de Investigación/ 10.13039/501100011033/ and Fondo Europeo de Desarrollo Regional “Una manera de hacer Europa”, I + D + i projects A-RNM-336-UGR20 and P20_00059 of the action “Proyectos I + D + i del Programa Operativo FEDER - Junta de Andalucía - UGR” and the research group RNM-190. This research is part of the project “Thematic Center on Mountain Ecosystem & Remote sensing, Deep learning- AI e-Services University of Granada-Sierra Nevada” (LifeWatch-2019- 10-UGR-01), which has been co-funded by the Ministry of Science and Innovation through the FEDER funds from the Spanish Pluriregional Operational Program 2014-2020 (POPE), LifeWatch-ERIC action line. José Carrión was supported by the I + D + I project PID2019-1049449 GB-I00 funded by MCIN/AEI/ 10.13039/501100011033/ and FEDER “Una manera de hacer Europa” and the fellowship 20788/PI/18 of Fundación Séneca. We thank Javier Jaimez for his help with the core drilling in Laguna Seca and Alejandro Navarro and Aurora Baquera for the sediment sampling. ALA acknowledges the predoctoral fellowship BES- 2018-084293 provide by the MCIN/ AEI/ 10.13039/5011000110 33/. CLB acknowledges the European Union for her Marie Sklodowska-Curie grant agreement number 892487 under Horizon 2020 funds. JC acknowledges the Ministerio de Ciencia e Innovación of the Spanish Government for the grant number FJC2020-044215-I of the Juan de la Cierva Formación postdoctoral program.Sedimentation in most glacial lakes and wetlands in the Sierra Nevada (southern Iberian Peninsula) began after the last deglaciation and since the Younger Dryas (YD)-Early Holocene (EH) transition. Therefore, until now, studies on older sedimentary records were lacking in this alpine area, which limits the paleoenvironmental and paleoclimatic information to the Holocene. In this study, we studied palynomorphs from the alpine record from Laguna Seca (LS), the longest and oldest (∼18,000 cal yr BP = 18 kyr) sedimentary record in the Sierra Nevada to investigate the response of forests and lake environments in the western Mediterranean area to climate changes and human impact during the latest Pleistocene and Holocene. The deepest lake conditions occurred during the last deglaciation, indicated by the occurrence of Pediastrum algae, which showed highest abundances during the Heinrich Stadial 1 (HS1) and Bølling-Allerød (B-A) transition. Xerophyte herbs such as Artemisia, Ephedra, and Amaranthaceae were highest during the late B-A and YD indicating regional aridity. Poaceae (grasses) were maxima in the B-A and EH, probably indicating expansion in the barren areas after deglaciation. Maximum in temperature and humidity during the EH and cooling and aridification in the Middle (MH) and Late Holocene (LH) are indicated by the changes in the abundance of deciduous Quercus and Pinus forest species. Botryococcus algae increased during the Early Holocene, while the rest of the algae almost vanished, which could indicate that the lake became very productive but shallower until 8.2 kyr. The lake level lowered and became seasonal in the Middle-Late Holocene transition, coinciding with the regional climate aridification. Microcharcoal analysis done on the palynological preparations agrees with the vegetation changes, showing maxima in the EH and MH, related with the maximum in regional forest occurrence, and a decrease in the LH when the Mediterranean vegetation, and thus fuel availability, diminished. This record shows evidence of anthropogenic impact in the last centuries by cultivation, reforestation, cattle grazing, enhanced erosion and eutrophication.I + D + i projects CGL2013-47038- R, CGL2017-85415-R, PID2019-1049449GB-I00, and PID2021- 125619OB-C21/C22 funded by Ministerio Ciencia e Innovación/Agencia Estatal de Investigación/ 10.13039/501100011033/ and Fondo Europeo de Desarrollo Regional “Una manera de hacer Europa”I + D + i projects A-RNM-336-UGR20 and P20_00059 of the action “Proyectos I + D + i del Programa Operativo FEDER - Junta de Andalucía - UGR” and the research group RNM-190Ministry of Science and Innovation through the FEDER funds from the Spanish Pluriregional Operational Program 2014-2020 (POPE), LifeWatch-ERIC action lineI + D + I project PID2019-1049449 GB-I00 funded by MCIN/AEI/ 10.13039/501100011033/ and FEDER “Una manera de hacer Europa” and the fellowship 20788/PI/18 of Fundación SénecaPredoctoral fellowship BES- 2018-084293 provide by the MCIN/ AEI/ 10.13039/5011000110 33/European Union for her Marie Sklodowska-Curie grant agreement number 892487 under Horizon 2020 fundsMinisterio de Ciencia e Innovación of the Spanish Government for the grant number FJC2020-044215-I of the Juan de la Cierva Formación postdoctoral progra

    Voltage limitation analysis in strain-balanced InAs/GaAsN quantum dot solar cells applied to the intermediate band concept

    Get PDF
    Several attempts have been carried out to manufacture intermediate band solar cells (IBSC) by means of quantum dot (QD) superlattices. This novel photovoltaic concept allows the collection of a wider range of the sunlight spectrum in order to provide higher cell photocurrent while maintaining the open-circuit voltage (VOC) of the cell. In this work, we analyze InAs/GaAsN QD-IBSCs. In these cells, the dilute nitrogen in the barrier plays an important role for the strain-balance (SB) of the QD layer region that would otherwise create dislocations under the effect of the accumulated strain. The introduction of GaAsN SB layers allows increasing the light absorption in the QD region by multi-stacking more than 100 QD layers. The photo-generated current density (JL) versus VOC was measured under varied concentrated light intensity and temperature. We found that the VOC of the cell at 20 K is limited by the bandgap of the GaAsN barriers, which has important consequences regarding IBSC bandgap engineering that are also discussed in this work

    RESPUESTA DE HÍBRIDOS DE CHILE ANAHEIM (CAPSICUM ANNUUM L.) CARDÓN Y 118, CULTIVADOS BAJO DOS SISTEMAS DE PRODUCCIÓN EN CONDICIONES DE INVERNADERO

    Get PDF
    The production system under greenhouse makes possible to obtain higher yields and better fruit quality. Two Anaheim pepper hybrids were produced during summer-fall season of 2011 at the experimental field of the University of Sonora, México. The objectives were to evaluate the yield and fruit quality, and to determine the water use efficiency, under greenhouse conditions using two production systems, substrate and soil. In the soil system the higher fruit weights were obtained with 63.12 g fruit-1 and 61.98 g fruit-1, in Cardon and 118 respectively. The fruit number per plant and the yield in the first harvest were higher in the substrate system; however, the final averages were no significant among treatments. The higher fruit length, 17.52 and 15.52 cm in Cardon and 118 respectively, were obtained in the soil system. The fruit diameter did not present significant differences among treatments. The water use efficiency (WUE) was higher in the soil system, with 36.4 and 31.2 kg m-3 compared to 9.1 y 9.9 kg m-3 obtained in the substrate system for 118 and Cardon respectively
    corecore