Simulation of DC dual-laterolog measurements in complex formations: A Fourier-series approach with nonorthogonal coordinates and self-adapting finite elements

Dual laterolog (DLL) makes use of a galvanic conduction principle to focus electrical currents into rock formations, thereby minimizing shoulder and borehole effects in the measurement of formation resistivity. The tool includes two separate focusing systems: deep-sensing (LLd) and shallow-sensing modes (LLs). Laterolog current-focusing systems were designed for operation primarily in vertical boreholes penetrating horizontal layers; only recently their design has been revised for operation in deviated wells in the presence of electrical anisotropy. We simulated three-dimensional (3D) DLL measurements in dipping, invaded, and electrically anisotropic formations and appraised the corresponding effects on apparent resistivity logs. Simulations were performed by combining the use of a Fourier-series expansion in a nonorthogonal system of coordinates with an existing 2D goal-oriented, higher-order, and self-adaptive finite-element method. This numerical algorithm yields accurate solutions in limited CPU time because only a few Fourier modes are needed to simulate practical applications. For the calculation of focused currents, we introduced an embedded postprocessing method that incorporates a synthetic focusing principle to compute current intensities at each iterative step of optimal mesh refinements. Our numerical method accurately simulates 3D DLL measurements in rock formations that exhibit extreme contrasts of electrical resistivity. Simulations indicate that LLs resistivity logs are more sensitive to both invaded and anisotropic layers than LLd resistivity logs. In deviated wells, shoulder-bed effects on apparent resistivity logs increase with an increase of dip angle, and are emphasized across thin conductive layers. Electrical anisotropy effects on apparent resistivity logs increase substantially with dip angle. © 2009 Society of Exploration Geophysicists. All rights reserved

Aceite de oliva virgen y regulación hormonal de la presión arterial: una revisión del papel de los enzimas proteolíticos

Numerosos estudios realizados en los últimos años, han puesto de manifiesto que los niveles elevados de grasa en la dieta están directamente relacionados con el desarrollo de diversas patologías, entre las que destacan enfermedades cardiovasculares, diabetes o incluso diversos tipos de cánceres. Estudios epidemiológicos también han demostrado que no sólo es importante la cantidad, sino también el tipo de grasa de la dieta. Son especialmente conocidos los efectos beneficiosos de la dieta mediterránea, caracterizada entre otros aspectos, por un consumo elevado de ácidos grasos monoinsaturados como el oleico. En cualquier caso, no se conoce con exactitud las relaciones existentes entre el tipo de grasa de la dieta y el desarrollo de las distintas patologías. Las aminopeptidasas son enzimas proteolíticos implicados en una amplia variedad de procesos biológicos, destacando su papel en el control de la presión arterial a través del sistema renina-angiotensina. En esta revisión se estudia la influencia de una dieta enriquecida en aceite de oliva sobre la actividad aminopeptidásica sérica y de tejidos periféricos, analizando su influencia en la regulación del sistema renina-angiotensina para el control de la presión arterial y el balance de líquidos y electrolitos.The intake of high fat dietary levels is related to the development of several pathologies such as cardiovascular diseases, diabetes and cancer. However, epidemiological studies have demonstrated that not only the amount but also the type of dietary fat participates in the origin of the diseases. In fact, several important beneficts have been attributed to the Mediterranean diet, characterized by the high intake of monoinsaturated fatty acids such as oleic acid preferently. In any case, the relationship between the type of dietary fat an the development of diseases are unknown. Aminopeptidases are proteolytic enzymes involved in several biological proccesses, regulating blood pressure through the renin-angiotensin system. In this review, the influence of an olive oil-enriched diet is presented, analyzing their role in the regulation of blood pressure, local blood flow and fluid and electrolytic balance among other functions

Simulation of marine controlled source electromagnetic measurements using a parallel fourier hp-finite element method

We introduce a new numerical method to simulate geophysical marine controlled source electromagnetic (CSEM) measurements for the case of 2D structures and finite 3D sources of electromagnetic (EM) excitation. The method of solution is based on a spatial discretization that combines a 1D Fourier transform with a 2D self-adaptive, goal-oriented, hp-Finite element method. It enables fast and accurate simulations for a variety of important, challenging and practical cases of marine CSEM acquisition. Numerical results confirm the high accuracy of the method as well as some of the main physical properties of marine CSEM measurements such as high measurement sensitivity to oil-bearing layers in the subsurface. In our model, numerical results indicate that measurements could be affected by the finite oil-bearing layer by as much as 104% (relative difference). While the emphasis of this paper is on EM simulations, the method can be used to simulate different physical phenomena such as seismic measurements

Post-truth, gender issues and sports entertainment: the setting in Ibero-America’s main digital media for the Super Bowl halftime show 2020

The subject of this research topic is the frameworks and the media representation of the role of women in mass sports events. The case study corresponds to the participation for the first time in the halftime show of the “Super Bowl 2020” of two of the main Latin pop artists: Shakira and Jennifer López. The objective of the study is to characterize the treatment of the event given by the media (both generalist and sports-themed) of the 22 countries that make up Ibero-America together with that on social networks. The assumptions that have guided the research seek to determine whether an objectification of women in the image that is built from the media and on social networks really exists; and whether the frames that occur in both are identical or different. The methodological design includes a content analysis and impact measurement with Big Data technology. The main results and conclusions include the objectification of women in all the generalist media; and 50% in sports-themed media. Similarly, it should be noted that social media reflect the impact of conventional media more than tenfold and most importantly, a change in trend and progress is foreseen in media frameworks with a gender perspective.Esta investigación aborda el análisis de los marcos y la representación mediática del papel de la mujer en los eventos deportivos de masas. El caso de estudio que concretamente analizamos se centra en la participación de dos de las principales artistas pop latinas: Shakira y Jennifer López, en el espectáculo de medio tiempo de la “Super Bowl 2020”, un hecho insólito en la historia de dicho macroevento. El objetivo del estudio es analizar el tratamiento que tanto los medios de comunicación (generalistas como deportivos) de los 22 países que componen Iberoamérica, como las redes sociales, dieron a este acontecimiento. Los supuestos que han guiado la investigación buscan determinar si existe realmente una cosificación de las mujeres en la imagen que se construye en los medios de comunicación y en las redes sociales; y si los marcos que ocurren en ambos son idénticos o diferentes. El diseño metodológico incluye el análisis de contenido y la medición de impacto con tecnología Big Data. Los principales resultados y conclusiones muestran la cosificación de las mujeres en todos los medios generalistas y en la mitad de los medios de temática deportiva. Del mismo modo, cabe señalar que el impacto de las redes sociales es diez veces superior al de los medios convencionales y, lo más importante, se observa un cambio de tendencia y un progreso en el framing de los medios de comunicación en perspectiva de género

The Impact of the Malolactic Fermentation in the Volatile Composition of Trincadeira Wine Variety

Use of commercial starters for malolactic fermentation (MLF) is a common practice, and outcomes of this procedure are very relevant for wine producers because aroma attributes might change according to the strain used. MLF was carried out in the Trincadeira wine variety in three batches: spontaneously and with inoculation of two different commercial starters. Wine extracts before and after MLF were obtained through liquid–liquid extraction. Gas chromatography/ion trap mass spectrometry analysis allowed the detection of 21 compounds, some of them tentatively identified through electron impact spectra comparison with a database, through interpretation of multistage mass spectrometry and chemical ionization mass spectrometry spectra and confirmation by comprehensive multidimensional gas chromatography/ time of flight-mass spectrometry (GC ¥ GC/ToF-MS). After MLF, an increase in ethyl lactate, g-butyrolactone and diethyl succinate and a drop in isoamyl acetate, ethyl octanoate, ethyl decanoate, 2,3-dimethyl-hexan-3-ol, propanol, isobutanol and 2,3-butanediol was observed. The concentrations of the 10 compounds are statistically different in wines before and after MLF, and wines after MLF show significant differences for the nine compounds

Development of a novel fcc structure for an amorphous-nanocrystalline Ti-33Nb-4Mn (at.%) ternary alloy

[EN] In this work, a novel amorphous-nanocrystalline titanium-niobium-manganese solid solution ternary alloy with a Ti-33Nb-4Mn (at.%) nominal composition was developed by a High-Energy Mechanical Alloying. Nb and Mn were added to the elemental Ti as a beta-phase (bcc) stabilizer and an amorphization promoter, respectively. The system evolved from the elemental Ti, Nb and Mn raw materials to a body centred cubic (bcc) TiNbMn alloy and, finally, to the formation of an original and stable face centred cubic (fcc) nanocrystalline TiNbMn alloy, not reported until now, at short milling time (20 h). This alloy remains invariant until 120 h. In turn, the partial amorphization of the system occurs and increases until at intermediate milling time (80 h). The production of both original fcc and the amorphous TiNbMn alloy may be beneficial for reducing the Young's modulus and improving the mechanical strength pursued for the Ti alloy. The optimal milling time respect to the amorphization, nanocrystalline size and Fe mount from milling media was 60 h and 80 h (TiNbMn60h and TiNbMn80h), with > 50 wt% of an amorphous phase and a crystalline domain size of approximately 5 nm.This work was supported under postdoctoral grant no. 3150060, which is financed by the FONDECYT fund (Government of Chile).Chicardi, E.; García-Garrido, C.; Sayagués, M.; Torres, Y.; Amigó, V.; Aguilar, C. (2018). Development of a novel fcc structure for an amorphous-nanocrystalline Ti-33Nb-4Mn (at.%) ternary alloy. Materials Characterization. 135:46-56. https://doi.org/10.1016/j.matchar.2017.11.021S465613