The mediated effect of social presence on social commerce WOM behavior

Based on expectation disconfirmation theory, this study analyzes how attitudes (satisfaction and loyalty) influence interaction intention (sWOM) and, consequently, active and passive sWOM behavior. It does so by assessing the mediating role of social presence on sWOM intention and behavior. The empirical results provide several contributions. First, knowing how to increase active sWOM contributes to bridging the gap regarding how to enhance interactions between users. Second, fostering active sWOM on social commerce websites will provide companies with more positive user-generated content, since this active sWOM comes from satisfied and loyal users, and it is assumed that they will rate the product positively and report a good experience. Third, companies can benefit more from users if users interact with other users by sharing their experiences. This study sheds light on how social presence can mediate the relationship between intention and behavior, particularly when it comes to increasing active participation and brand promotion. © 2021 by the authors. Licensee MDPI, Basel, Switzerland

High-resolution study of a star-forming cluster in the Cep-A HW2 region

Due to its relatively small distance (725 pc), the Cepheus A East star-forming region is an ideal laboratory to study massive star formation processes. Based on its morphology, it has been suggested that the flattened molecular gas distribution around the YSO HW2 may be a 350-AU-radius massive protostellar disk. Goal of our work is to ascertain the nature of this structure. We have employed the Plateau de Bure Interferometer to acquire (sub-)arcsecond-resolution imaging of high-density and shock tracers, such as methyl cyanide (CH3CN) and silicon monoxide (SiO), towards the HW2 position. On the 1-arcsecond (about 725 AU) scale, the flattened distribution of molecular gas around HW2 appears to be due to the projected superposition, on the plane of the sky, of at least three protostellar objects, of which at least one is powering a molecular outflow at a small angle with respect to the line of sight. The presence of a protostellar disk around HW2 is not ruled out, but such structure is likely to be detected on a smaller spatial scale, or using different molecular tracers.Comment: 6 pages, 5 figures, accepted for publication in Astronomy & Astrophysic

Reconocimiento de suelos del Aljarafe alto (Sevilla - España)

36 páginas.-- fotos.-- perfiles de suelos.-- Un mapa (Se incorporará en breve).-- Memoria presentada en el XXXIII Curso Internacional de Edafología y Biología VegetalDirector: Clemente Salas, LuisEl presente trabajo se realizó en el área central del Aljarafe Alto; entre las coordenadas 06° 05' 59" a 06° 10' 45" longitud norte y 37" 09' 40" a 37° 21' 45" longitud oeste, sobre una superficie de 30 km2, a 24 km al suroeste de Sevilla, próximo al término Municipal de Bollullos de la Mitación. Geomorfológicamente se encuentra en una meseta o penillanura. Siendo el objetivo del presente estudio es el reconocimiento y clasificación taxonómica de los suelos, reconociéndose para una escala 1: 20,000 las siguientes unidades taxonómicas a nivel de subgrupo: Rhodoxeralfs Cálcico, Haploxeralfs Cálcico, Haploxeralfs Aquico y Xerochrepts Calciceróllico; así mismo, se han distinguido las unidades cartográficas: Asociación Rhodoxeralfs Cálcico-Haploxeralfs Cálcico en un 40% la de superficie; Asociación Haploxeralfs Cálcico-Rhodoxeralfs Cálcico en un 30%; evidenciando estas dos asociaciones alta sinuosidad en su distribución morfológica y diferenciándose como tales por el predominio de un taxón sobre el otro. y la asociación Xerochrepts Calciceróllico - Haploxera1fs Cálcico en un 10%; así como las Consociaciones Haploxeralfs Acnico en un 15% y la Consociación Xerochrepts Calciceróllico en un 5%.Patrocinado por la UNESCO, el Instituto de Cooperación Iberoamericana (ICI); el Consejo Superior de Investigaciones Científicas (CSIC) y la Universidad de Sevilla - España.Peer reviewe

Oxidative Stress in Cystic Fibrosis

Airway infection leads to progressive damage of the lungs in patients with cystic fibrosis (CF). Oxidative stress has been implicated as a causative factor in the aetiology of that process. Supplementation with antioxidant micronutrients (vitamin E, vitamin C, ß-carotene and selenium), docosahexaenoic acid or glutathione might therefore be helpful in maintaining an adequate redox balance. Current literature suggests a relationship between oxidative status and lung function. In this chapter we will summarize the main pathways of oxidative stress, focusing on results of new antioxidant treatments

A Light Calibration System for the ProtoDUNE-DP Detector

A LED-based fiber calibration system for the ProtoDUNE-Dual Phase (DP) photon detection system (PDS) has been designed and validated. ProtoDUNE-DP is a 6x6x6 m3 liquid argon time-projection-chamber currently being installed at the Neutrino Platform at CERN. The PDS is based on 36 8-inch photomultiplier tubes (PMTs) and will allow triggering on cosmic rays. The system serves as prototype for the PDS of the final DUNE DP far detector in which the PDS also has the function to allow the 3D event reconstruction on non-beam physics. For this purpose an equalized PMT response is desirable to allow using the same threshold definition for all PMT groups, simplifying the determination of the trigger efficiency. The light calibration system described in this paper is developed to provide this and to monitor the PMT performance in-situ.Comment: 15 pages, 5 figure

Choosing Expected Shortfall over VaR in Basel III Using Stochastic Dominance

Bank risk managers follow the Basel Committee on Banking Supervision (BCBS) recommendations that recently proposed shifting the quantitative risk metrics system from Value-at-Risk (VaR) to Expected Shortfall (ES). The Basel Committee on Banking Supervision (2013, p. 3) noted that: “a number of weaknesses have been identified with using VaR for determining regulatory capital requirements, including its inability to capture tail risk”. The proposed reform costs and impact on bank balances may be substantial, such that the size and distribution of daily capital charges under the new rules could be affected significantly. Regulators and bank risk managers agree that all else being equal, a “better” distribution of daily capital charges is to be preferred. The distribution of daily capital charges depends generally on two sets of factors: (1) the risk function that is adopted (ES versus VaR); and (2) their estimated counterparts. The latter is dependent on what models are used by bank risk managers to provide for forecasts of daily capital charges. That is to say, while ES is known to be a preferable “risk function” based on its fundamental properties and greater accounting for the tails of alternative distributions, that same sensitivity to tails can lead to greater daily capital charges, which is the relevant (that is, controlling) practical reference for risk management decisions and observations. In view of the generally agreed focus in this field on the tails of non-standard distributions and low probability outcomes, an assessment of relative merits of estimated ES and estimated VaR is ideally not limited to mean variance considerations. For this reason, robust comparisons between ES and VaR will be achieved in the paper by using a Stochastic Dominance (SD) approach to rank ES and VaR

Prototype of a high resolution regional reanalysis for Iberian Peninsula an Balearic Islands (IBERA)

Póster presentado en: 1st ACCORD All Staff Workshop celebrado del 12 al 16 de abril de 2021 de forma online