Validación de escala de calidad, valor percibido, futura intención de práctica y satisfacción de la actividad chárter enfocada al desarrollo de los negocios naúticos

© 2023. This document is made available under the CC-BY-NC-SA 4.0 license http://creativecommons.org/licenses/by-nc-sa/4.0/ This document is the Published version that appeared in final form in Journal of Sport and Health Reserarch. To access the final edited and published work see https://doi.org/10.58727/jshr.98612The quality of the touristic and sports services as the nautical charter requires a careful treatment and analysis due to the economic impact that it represents in the sector in general, and moreover in Balearic Islands, which is a reflection of tourism and recreation globally. Through a questionnare, which has into account four measure factors, 185 users of charter companies during the summer season from different nationalities, ages and genders were surveyed. The objective was to verify its meassure validity for users of these services. The figures obtained by the adjustement and error rate were successful, same as every value obtained in the estimation of the scale’s fiability and its convergent and discriminant validity. This questionnare will provide a general view of the users’ opinion in conection with sport.La calidad de los servicios turísticos y deportivos como el chárter náutico requiere un tratamiento y análisis cuidadoso debido al impacto económico que representa en el sector en general, máxime en las Islas Baleares, donde es un reflejo del turismo y la recreación a nivel mundial. A través de un cuestionario, que tiene en cuenta cuatro factores de medida, se encuestó a 185 usuarios de compañías chárter durante la temporada de verano de diferentes nacionalidades, edades y géneros. El objetivo era verificar su validez de medida para los usuarios de estos servicios. Las cifras obtenidas por el ajuste y la tasa de error fueron exitosas, igual que cada valor obtenido en la estimación de la confiabilidad de la escala y su validez convergente y discriminante. Este cuestionario proporcionará una visión general de la opinión de los usuarios en relación con el deporte

Density, refractive index and volumetric properties of water-ionic liquid binary systems with imidazolium-based cations and tetrafluoroborate, triflate and octylsulphate anions at T=293 to 343 K and p=0.1 MPa

©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Chemical and Engineering Data. To access the final edited and published work see: https://doi.org/10.1021/acs.jced.8b00854The density and refractive index of ionic liquids (ILs) + water binary mixtures were determined as a function of temperature (from 293.15 to 343.15 K) at atmospheric pressure over the whole composition range in which the mixtures were miscible. To carry out a systematic study, all the ILs selected are imidazolium-based ILs with a different number of carbons in the alkyl chain of the cation and also different anions (tetrafluoroborate, triflate and octylsulphate). Specifically, the studied ILs were 1-ethyl-3-methylimidazolium tetrafluoroborate [emim][BF4], 1-butyl-3-methylimidazolium tetrafluoroborate [bmim][BF4], 1-hexyl-3-methylimidazolium tetrafluoroborate [hmim][BF4], 1-methyl-3-octylimidazolium tetrafluoroborate [omim][BF4], 1-ethyl-3-methylimidazolium triflate [emim][TfO], 1-butyl-3-methylimidazolium triflate [bmim][TfO] and 1-butyl-3-methylimidazolium octylsulphate [bmim][OcSO4]. The excess molar volumes and the deviation in the molar refraction of the binary mixtures were calculated for a better understanding of the interactions that take place between the components and successfully correlated by the Redlich-Kister empirical correlations. Bahe-Varela model, which has a more physical meaning, was also used to successfully correlate the excess molar volume values. Volumetric properties, such as apparent molar volumes, partial molar volumes, isobaric thermal expansion coefficients, partial molar volumes at infinite dilution and excess partial molar volumes at infinite dilution were also calculated in order to obtain information about the influence of composition and temperature on the thermodynamic behavior of the selected ILs and water in the mixture. The results are discussed in order to understand the formation of hydrogen bonds between components of the mixture and the possible packing effects that take place in the mixing process. Density and refractive index experimental data were correlated by the Lorentz-Lorenz, Wiener, Dale-Gladstone and Eykman equations to determine the relationship between both parameters, and a good agreement between the experimental and calculated refractive index values was obtained

High pressure phase equilibria for binary mixtures of CO2 + 2-pentanol, vinyl butyrate, 2-pentyl butyrate or butyric acid systems

©2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Supercritical Fluids. To access the final edited and published work see DOI: 10.1021/acs.jced.8b00854High pressure phase equilibrium for four binary systems, (CO2 + 2-pentanol, CO2 + vinyl butyrate, CO2 + 2-pentyl butyrate and CO2 + butyric acid), were measured at three temperatures of (313.15, 323.15 and 333.15) K and pressures up to 11 MPa. These four organic compounds are those involved in the kinetic resolution of rac-2-pentanol and their phase equilibria play a significant role in the separation processes of the reaction compounds. Phase behaviour measurements were taken using a synthetic method in a variable volume high-pressure cell. It was checked that the solubility of CO2 in the four systems decreases with increases in temperature at a constant pressure and all systems present type-I phase behaviour within scope of this work. Modifications of Henry's Law and Peng-Robinson and Soave-Redlich-Kwong equations of state combined with the Quadratic mixing rule were used to correlate experimental equilibrium data to determine the phase behaviour of these systems

Predicting Density and Refractive Index of Ionic Liquids

The determination of the physicochemical properties of ionic liquids (ILs), such as density and refractive index, is essential for the design of processes that involve ILs. Density has been widely studied in ILs because of its importance whereas refractive index has received less attention even though its determination is rapid, highly accurate and needs a small amount of sample in most techniques. Due to the large number of possible cation and anion combinations, it is not practical to use trial and error methods to find a suitable ionic liquid for a given function. It would be preferable to predict physical properties of ILs from their structure. We compile in this work different methods to predict density and refractive index of ILs from literature. Especially, we describe the method developed by the authors in a previous work for predicting density of ILs through their molecular volume. We also correlate our experimental measurements of density and refractive index of ILs in order to predict one of the parameters knowing the other one as a function of temperature. As the measurement of refractive index is very fast and needs only a drop of the ionic liquid, this is also a very useful approach

The Use of Multivariate Analysis in Tropical Grass and Legume Seed Production in Cuban Regions

Seed production is an important activity in developing countries where pastures are the main source for animal feeding (Febles et al. 2003). Another outstanding aspect is the mathematical analysis used when a large number of species, varieties and ecotypes are used in the same study. The objective of this paper was to examine the use of multivariate analysis in studies on the effects of edaphoclimatic factors on seed production from tropical grasses and legumes

A step ahead on efficient microwave heating for kaolinite

[EN] The thermal evolution of kaolin clay under microwave radiation shows an unexpected large heating rate up to 500 degrees C/min for temperatures > 650 degrees C. Such heating rate is associated with a resistivity drop of > 10(3) Omega.m observed after the dehydroxylation process of the kaolin structure. The high efficiency of the microwave heating effect is correlated with the presence of surface carriers that absorbs microwaves electromagnetic field. The layered structure of the clay-based materials allows the appearance of charge carriers at the surface of the crystal lattice that is electromagnetically activated. This effect represents a breakthrough in the efficient use of microwaves energy in order to produce efficient thermal treatments in large volume of non-metallic minerals with a drastic reduction of the greenhouse gasses for mass production industries.The authors express their thanks to the project MAT-2017-86450-C4-1-R from the Spanis Goverment for the financial support.Reinosa, JJ.; García-Baños, B.; Catalá Civera, JM.; Fernández Lozano, JF. (2019). A step ahead on efficient microwave heating for kaolinite. Applied Clay Science. 168:237-243. https://doi.org/10.1016/j.clay.2018.11.001S23724316