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Papers by Jose ruiz gonzalez

Geofísica Internacional

Realizamos un estudio de paleointensidad con el método de Thellier sobre la secuencia volcánica d... more Realizamos un estudio de paleointensidad con el método de Thellier sobre la secuencia volcánica de 3.8 Ma en Georgia (Surdel Cáucaso). Estudios paleomagnéticos previos de esta sucesión revelaron que ocho flujos consecutivos de lava registraron unapolaridad magnética reversa en la base de la sección, seguida por una zona de polaridad normal en 18 flujos consecutivos. 27muestras de 9 flujos de ambas zonas fueron preseleccionados para experimentos de paleointensidad debido a su bajo índice demagnetización viscosa, magnetización remanente estable, curvas termomagnéticas reversibles y a una fracción menor de granosmagnéticos con estructura de multidominio. 13 muestras de 6 distintas unidades de enfriamiento permitieron una estimaciónconfiable de la paleointensidad con la variación del momento virtual dipolar (MVD) promedio desde 5.8 hasta 7.6*1022 Am2.Nuestros resultados, aunque no numerosos, son de una alta calidad técnica y comparables con otros datos de paleointensidadrecientemente ob...

Renewable Energy and Power Quality Journal, 2021

The installed power capacity from small wind turbines would rise in case of having higher efficie... more The installed power capacity from small wind turbines would rise in case of having higher efficiency values. The performance of these devices is very sensitive to wind conditions, especially to wind gusts and turbulence. Performance extracted from small-scale wind turbine datasheets show large variations of power output between turbulent and non-turbulent sites and often the installation in intermittent wind sites is discouraged. The use of blades with fixed positions is a clear drawback of small wind turbines. Here, we propose a design of a smart active pitch control to increase the energy generation of micro-wind turbines (< 5 kWp). The design consists of a simple mechanism that allows the rotation of the blades controlled by a low cost peripheral interface controller. The possibility to orientate the blades so as to maximise the power output at all wind conditions will increase the performance of this small wind turbines. The design is robust and economical, which will increas...

Studies in health technology and informatics, 2017

Thyroid nodules diseases are a common health problem and thyroidal cancer is becoming increasingl... more Thyroid nodules diseases are a common health problem and thyroidal cancer is becoming increasingly prevalent. They appear in the neck and bottom neck region, superficially over the trachea. Cancer tissues are characterized by higher temperatures than surrounding tissues. Thermography is a diagnostic tool increasingly used to detect cancer and abnormalities. Artificial intelligence is an approach which can be applied to thyroid nodules classification, but is necessary to have a proper number of cases with proven diagnosis. In this paper, a new database that contain infrared thermal images, clinical and physiological data is presented. The description of each nodule per patient, and the acquisition protocol (based on Dynamic Infrared Thermography approach) is considered as well. A semi-automatic method for image registration was implemented to pre-process the thermograms and a new method for the Region of Interest (ROI) extraction is proposed. Moreover, the obtained ROI results are co...

Energies, 2021

Automotive thermoelectric generators (ATEGs) are devices used to harvest waste energy from the ex... more Automotive thermoelectric generators (ATEGs) are devices used to harvest waste energy from the exhaust gases of internal combustion engines. An ATEG is essentially formed by three main elements: (1) heat absorber in contact with exhaust gases; (2) thermoelectric modules that directly convert heat into electricity; (3) heat sink to increase the heat transfer through the system. Thermoelectric modules (TEM) are commonly based on small-scale commercial units, with tenths of them needed to assemble a full ATEG device. Thus, several thermal and electrical connections between TEMs can be implemented. Previous studies focused on the implications on the output power. Here, we investigated the effects of using different module connections on the energy efficiency and on the electrical outputs (voltage and current). The study was carried out numerically with ATEGs that used from 4 to 100 individual TEMs. Series, parallel and square connections were investigated under two different engine oper...

Materials, 2019

The present work examines the synthesis of tricalcium aluminate (for use as a synthetic slag) fro... more The present work examines the synthesis of tricalcium aluminate (for use as a synthetic slag) from the non-saline dross produced in the manufacture of metallic aluminum in holding furnaces. Three types of input drosses were used with Al2O3 contents ranging from 58 to 82 wt %. Calcium aluminates were formed via the mechanical activation (reactive milling) of different mixtures of dross and calcium carbonate, sintering at 1300 °C. The variables affecting the process, especially the milling time and the Al2O3/CaO molar ratio, were studied. The final products were examined via X-Ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The reactive milling time used was 5 h in a ball mill, for a ball/dross mass ratio of 6.5. For a molar relationship of 1:3 (Al2O3/CaO), sintered products with calcium aluminate contents of over 90% were obtained, in which tricalcium aluminate (C3A) was the majority compound (87%), followed by...

International Journal of Sustainability in Higher Education, 2019

Purpose This paper aims to report on a case study concerning the development of sustainable energ... more Purpose This paper aims to report on a case study concerning the development of sustainable energy partnerships involving engineering faculty and undergraduate students at the University of Girona, Catalonia, Spain. Design/methodology/approach Faculty were motivated to seek partnerships with public and private entities in the local area for the purposes of realising mutually beneficial outcomes. The educational programmes of future engineers, when sustainability is considered, are analysed. Education for sustainable development has to include multidisciplinary active learning as a desirable competence. Active learning can be obtained when problems are based on real life because they are most motivating for students. Constructive alignment component is obtained because learning objectives are linked with learning activities related to the needs of public and private entities. Findings Through the provision of technical expertise, the adoption and success of renewable energy projects ...

American Journal of Business Education (AJBE), 2011

Lecture Notes in Computer Science

2013 46th Hawaii International Conference on System Sciences, 2013

Emergency evacuation of crowds is a fascinating phenomenon that has attracted researchers from va... more Emergency evacuation of crowds is a fascinating phenomenon that has attracted researchers from various fields. Better understanding of this class of crowd behavior opens up for improving evacuation policies and smarter design of buildings, increasing safety. Recently, a new class of disruptive technology has appeared: Humancentered sensing which allows crowd behavior to be monitored in real-time, and provides the basis for realtime crowd control. The question then becomes: to what degree can previous crowd models incorporate this development, and what areas need further research? In this paper, we provide a survey that describes some widely used crowd models and discuss their advantages and shortages from the angle of human-centered sensing. Our review reveals important research opportunities that may contribute to an improved and more robust emergency management.

Advances in Experimental Medicine and Biology, 1998

Physical review letters, Jan 8, 2007

Recent calculations of the recoil velocity in binary black-hole mergers have found the kick veloc... more Recent calculations of the recoil velocity in binary black-hole mergers have found the kick velocity to be of the order of a few hundred km/s in the case of nonspinning binaries and about 500 km/s in the case of spinning configurations, and have lead to predictions of a maximum kick of up to 1300 km/s. We test these predictions and demonstrate that kick velocities of at least 2500 km/s are possible for equal-mass binaries with antialigned spins in the orbital plane. Kicks of that magnitude are likely to have significant repercussions for models of black-hole formation, the population of intergalactic black holes, and the structure of host galaxies.

Clinical Lymphoma Myeloma and Leukemia, 2014

Psychiatry Research: Neuroimaging, 2007

Neuroimaging studies of emotional response in schizophrenia have mainly used visual (faces) parad... more Neuroimaging studies of emotional response in schizophrenia have mainly used visual (faces) paradigms and shown globally reduced brain activity. None of these studies have used an auditory paradigm. Our principal aim is to evaluate the emotional response of patients with schizophrenia to neutral and emotional words. An auditory emotional paradigm based on the most frequent words heard by psychotic patients with auditory hallucinations was designed. This paradigm was applied to evaluate cerebral activation with functional magnetic resonance imaging (fMRI) in 11 patients with schizophrenia with persistent hallucinations and 10 healthy subjects. We found a clear enhanced activity of the frontal lobe, temporal cortex, insula, cingulate, and amygdala (mainly right side) in patients when hearing emotional words in comparison with controls. Our findings are consistent with other studies suggesting a relevant role for emotional response in the pathogenesis and treatment of auditory hallucinations.

Progress in Neuro-Psychopharmacology and Biological Psychiatry, 2008

Proceedings of the National Academy of Sciences, 2013

Planktonic bacteria dominate surface ocean biomass and influence global biogeochemical processes,... more Planktonic bacteria dominate surface ocean biomass and influence global biogeochemical processes, but remain poorly characterized owing to difficulties in cultivation. Using large-scale single cell genomics, we obtained insight into the genome content and biogeography of many bacterial lineages inhabiting the surface ocean. We found that, compared with existing cultures, natural bacterioplankton have smaller genomes, fewer gene duplications, and are depleted in guanine and cytosine, noncoding nucleotides, and genes encoding transcription, signal transduction, and noncytoplasmic proteins. These findings provide strong evidence that genome streamlining and oligotrophy are prevalent features among diverse, free-living bacterioplankton, whereas existing laboratory cultures consist primarily of copiotrophs. The apparent ubiquity of metabolic specialization and mixotrophy, as predicted from single cell genomes, also may contribute to the difficulty in bacterioplankton cultivation. Using m...

Molecular Pharmacology, 2010