Beneficiaries in Modern Greek and Spanish: Description and reassessment of a semantic role

This paper studies the different flavours of beneficiaries in Modern Greek beyond the usual suspects. The purpose of this paper is to give a full account of this function in Modern Greek and to reassess the category benefactive in general. Greek data are compared with those taken from Spanish

Confined swirling jets with large expansion ratios

This paper presents the extension of our previous investigation of confined round jets with large Reynolds numbers and large expansion ratios (Revuelta, Sanchez & Linan 2002a) to the case of swirling jets with swirl numbers of order unity. In the absence of vortex breakdown, we encounter the four-region asymptotic structure identified earlier for the non-swirling jet, including a region of jet development where the azimuthal and axial velocity components are comparable. For the flow in the long recirculating eddy that forms downstream, where the pressure differences associated with the azimuthal motion become negligible, the jet is found to act as a point source with momentum flux equal to the flow force of the incoming jet, and angular momentum flux equal to that of the jet at the orifice. The solution for the weak circulation in this slender region, including the parameter-free leading-order description and the first-order corrections, is determined by integrating the azimuthal component of the momentum equation written in the boundary-layer approximation. The results are validated through comparisons with numerical integrations of the steady axisymmetric Navier-Stokes equations, which are also used to evaluate critical conditions for vortex breakdow

Laminar mixing in diluted and undiluted fuel jets upstream from lifted flames

The boundary-layer approximation is used to describe the frozen mixing process taking place when a fuel jet of radius a discharges into stagnant air. The results are applicable to the calculation of lifted flames stabilized in round laminar jets with relatively large Reynolds numbers, Re, for which the proposed formulation provides a detailed description for the velocity and composition fields encountered by the propagating triple flame formed at the base of the lifted flame. The problem is integrated for relevant values of the flow parameters, including values of the stoichiometric air-to-fuel mass ratio S of order unity, when the lifted flame is located in the region of jet development, corresponding to distances from the injector of order Re a. Further attention is given to the relevant case S ≫ 1, corresponding to typical conditions of undilute hydrocarbon-air flames, for which the resulting lifted flames are stabilized at relatively large distances from the injector, of order S Re a. It is seen that Schlichting asymptotic solution, which corresponds to a point source of momentum, is then applicable to describe the mixing process upstream from the lifted flame. Improved accuracy is sought by introducing expansions for the velocity components and for the reactant mass fractions in powers of S-1. The resulting development shows in particular that the first-order correction to the leading-order solution is equivalent to the introduction of a virtual origin for the axial coordinate. It is shown that the magnitude of the required translation, which is equal for the velocity and composition fields, must be determined from continuity considerations. As an illustrative example, the resulting description is used to calculate flame fronts with S ≫ 1 in the thermal-diffusive approximation

Confined axisymmetric laminar jets with large expansion ratios

This paper investigates the steady round laminar jet discharging into a coaxial duct when the jet Reynolds number, Re/sub j/, is large and the ratio of the jet radius to the duct radius, epsiv, is small. The analysis considers the distinguished double limit in which the Reynolds number Re/sub a/=Re/sub j/epsiv for the final downstream flow is of order unity, when four different regions can be identified in the flow field. Near the entrance, the outer confinement exerts a negligible influence on the incoming jet, which develops as a slender unconfined jet with constant momentum flux. The jet entrains outer fluid, inducing a slow backflow motion of the surrounding fluid near the backstep. Further downstream, the jet grows to fill the duct, exchanging momentum with the surrounding recirculating flow in a slender region where the Reynolds number is still of the order of Re/sub j/. The streamsurface bounding the toroidal vortex eventually intersects the outer wall, in a non-slender transition zone to the final downstream region of parallel streamlines. In the region of jet development, and also in the main region of recirculating flow, the boundary-layer approximation can be used to describe the flow, while the full Navier-Stokes equations are needed to describe the outer region surrounding the jet and the final transition region, with Re/sub a/=Re/sub j/epsiv entering as the relevant parameter to characterize the resulting non-slender flows

The quasi-cylindrical description of submerged laminar swirling jets

TThe quasi-cylindrical approximation is used to describe numerically the structure of a submerged swirling jet for subcritical values of the swirl ratio S<Sc . The emerging flow structure is affected by the swirling motion, which enhances the entrainment rate of the jet and induces an adverse pressure gradient that reduces its momentum flux. The effect is more pronounced as the swirl ratio S is increased, yielding for sufficiently large values of S a jet with an annular structure. The integration describes the smooth transition towards the far-field self-similar solution for all values of S smaller than a critical value S5Sc , at which the numerical integration fails to converge at a given downstream location. The comparisons with previous experimental results confirm the correspondence between the onset of vortex breakdown and the failure of the quasi-cylindrical approximation

Dropshipping. Caso práctico de creación de un negocio web online.

A lo largo de este proyecto se estudiará un modelo de negocio online el cual definiremos, analizaremos sus partes y, por último, nos basaremos en el para crear desde cero nuestro propio negocio online. En primer lugar, se aclararán algunos conceptos básicos teóricos que servirán de base para el resto del trabajo, después se explicarán algunas decisiones tomadas que afectan directamente a la empresa y como han sido estas tomadas. En la segunda parte del documento se analizará el plan estratégico seguido a lo largo del proyecto, definiendo diferentes estrategias y exponiendo diferentes ejemplos de cada una de ellas. Por último, se detallará la solución aportada para ese modelo de negocio, estudiando todos los aspectos de la página web de la empresa y los resultados de las campañas de marketing obtenidos de la realización del plan estratégico de marketing. Se analizarán estos datos, identificando acciones futuras y posibles estrategias a largo plazoThroughout this project an online business model is studied. We will define it, analyze its parts and, finally, we will build on it to create our own online business. First, some basic theoretical concepts that will serve as a basis for the rest of the work will be clarified, then some decisions taken that directly affect the company and how they have been taken will be explained. On the second part of the document, the strategic plan followed throughout the project will be analyzed, defining different strategies and giving different examples of each of them. Finally, the solution provided for this business model will be detailed, studying all the aspects of the company’s website and the results of the marketing campaigns obtained from the implementation of the strategic marketing plan. These data will be analysed, identifying future actions and possible long-term strategies

Laminar Craya-Curtet jets

This Brief Communication investigates laminar Craya-Curtet flows, formed when a jet with moderately large Reynolds number discharges into a coaxial ducted flow of much larger radius. It is seen that the Craya-Curtet number, C=(J/sub c//J/sub j/)/sup 1/2/, defined as the square root of the ratio of the momentum flux of the coflowing stream to that of the central jet, arises as the single governing parameter when the boundary-layer approximation is used to describe the resulting steady slender jet. The numerical integrations show that for C above a critical value C/sub c/ the resulting streamlines remain aligned with the axis, while for C<C/sub c/ the entrainment demands of the jet cannot be satisfied by the coflow, and a toroidal recirculation region forms. The critical Craya-Curtet number is determined for both uniform and parabolic coflow, yielding C/sub c/=0.65 and C/sub c/=0.77, respectively. The streamlines determined numerically are compared with those obtained experimentally by flow visualizations, yielding good agreement in the resulting flow structure and also in the value of C/sub c

Instantaneous Reactive Power Theory in the Geometric Algebra Framework

In this paper, a new approach for instantaneous reactive power analysis in the geometric algebra (GA) environment is presented. The different formulations of the instantaneous reactive power theory (IRPT) proposed, to date, have been developed in three-phase systems. There, an instantaneous power variable, and two/three reactive power variables, all handled independently, were introduced. Thanks to GA, it is possible to carry out a global treatment where an instantaneous power multivector is defined. Thus, in the same multidimensional entity all the power variables are included. From the instantaneous power multivector, the instantaneous power current and the instantaneous reactive current are determined. It should be noted that in this mathematical framework there is no limitation on the number of phases, and the extension of the IRPT to the analysis of multi-phase systems appears in a natural manner. In this study, a systematic approach with the most relevant definitions and theorems corresponding to the proposed methodology has been established. Two practical cases of five-phase and three-phase systems have been included to apply the new established formulation

Validation Study of the Use of Matlab/Simulink Synchronous-Machine Block for Accurate Power-Plant Stability Studies

This paper presents results of the validity study of the use of MATLAB/Simulink synchronous-machine block for power-system stability studies. Firstly, the waveforms of the theoretical synchronous-generator short-circuit currents are described. Thereafter, the comparison between the currents obtained through the simulation model in the sudden short-circuit test, are compared to the theoretical ones. Finally, the factory tests of two commercial generating units are compared to the response of the synchronous generator simulation block during sudden short-circuit, set with the same real data, with satisfactory results. This results show the validity of the use of this generator block for power plant simulation

The influence of specific domains of self-concept on the school engagement of secondary school students

El objetivo de este estudio es analizar la capacidad predictiva de los dominios específicos del autoconcepto en la implicación escolar del alumnado de educación secundaria. La muestra está compuesta por 484 estudiantes (47.31% hombres y 52.69% mujeres; Medad = 14.89 años, DT = 1.99) de centros públicos y privados de la Comunidad Autónoma Vasca. Los análisis estadísticos se realizan mediante el programa estadístico SPSS v.22. Los principales resultados de esta investigación evidencian la capacidad predictiva del autoconcepto académico sobre la implicación emocional, conductual y cognitiva en la escuela. Asimismo, los datos revelan que el autoconcepto físico, social y personal también contribuirían a explicar la implicación del alumnado en la escuela. Estos resultados ponen de manifiesto la necesidad de profundizar en la contribución del autoconcepto no académico al ajuste escolar durante la adolescencia.The aim of this study is to analyze the predictive ability of specific domains of self-concept in school engagement of secondary school students. The sample consists of 484 students (47.31% men and 52.69% women; Mage = 14.89 years, SD = 1.99) from public and private schools from the Basque Autonomous Community. The statistical analyses were performed using SPSS v.22 software. The main results of this research provide evidence for the predictive ability of academic self-concept in emotional, behavioural, and cognitive engagement in school. Additionally, the data show that physical, social, and personal selfconcept may also help to explain the engagement of students in school. These results point out the need of deepen the contribution of non-academic self-concept to school adjustment during adolescence.Trabajo realizado al amparo de una Ayuda para la Formación de Personal Universitario (FPU13/00835) del Ministerio de Educación, Cultura y Deporte de España. Esta investigación forma parte del trabajo realizado dentro del Grupo Consolidado de Investigación del Sistema Universitario Vasco IT701-13 y de los resultados del proyecto de investigación EHUA13/26 de la Universidad del País Vasco