The websites adoption in the Spanish agrifood firms

Currently, the use of websites in the firms of the Spanish agrifood sector has not become widespread despite the possible benefits to be derived from their adequate integration and management within the firms. Among these advantages, the increase in the quality of the services offered and the improvement in the relations with their stakeholders should be highlighted. In this context, the objective of the present work is to determine to what extent websites are used by firms in the agrifood sector of Spain, analysing the background which explains why they are adopted and the consequences of introducing them. To do so, a theoretical framework is posed which allows these factors to be identified, and an empirical study is carried out with Spanish agrifood firms. The results of the work indicate that the adoption of websites will be favoured when the directors of the firm are higher qualified, the firm is bigger in size, the firm’s function is distribution, and when the relative advantage and technology compatibility is perceived, among others. Technology adoption consequences analysis suggests that the benefits of adoption are related with improving the relationships with suppliers, customers, owning partners and, in general, the quality of the services offered by the firm

El impacto de la educación ambiental en la conservación de la tortuga marina en Mazatlán, Sinaloa, México.

The dynamics of a new segment of tourist activity bases its action on creating a link between the subject, the experience and the environment, these are the most important conditions for the tourist to choose the destination to visit. Environmental education within ecotourism is a strategic tool to promote respect for wildlife. The objective of this work was to develop an analysis of the impact of environmental education on the conservation of sea turtles in Mazatlán, Sinaloa, Mexico throughout three decades of recorded biological data in order to promote sustainable tourism with more socially solid attitudes. In Mazatlán Sinaloa, every year, during the sea turtle nesting season (July-October), numerous ecotourist subjects are interested in these endangered reptiles, in order to help protect and conserve these animals. There are regional and federal government public institutions that have a role in environmental education and wildlife conservation. This work involves the approach of animals on a coastal zone on the beaches with tourist dynamics with anthropocentric predominance with the aim of educating various social actors, where the natural resources that are the object of this investigation are sea turtles called olive ridleys Lepidochelys olivacea (Eschscholtz, 1829). The Mazatlán Aquarium with its sea turtle conservation program has managed to protect 15,103 nests; 1,393,194 eggs; 1,103,006 turtles released; 70.2% survival and 290,188 deaths due to natural disasters and other causes. Tourism supported by environmental education promotes an influence on residents and tourists for the care of the natural heritage of natural resources such as marine turtles. This research is a multidisciplinary analysis of the educational, biological, and sociocultural sciences based on a documentary review with in-depth interviews with key actors. There is a conceptual interpretation where social actors learn about biology, conservation, threats, and respect for wild animal life during their visit to the Sinaloan port.La dinámica de un nuevo segmento de la actividad turística basa su acción en crear un vínculo entre el sujeto, la experiencia y el medio ambiente, estas son las condiciones más importantes para que el turista realice la elección del destino a visitar. La educación ambiental dentro del ecoturismo es una herramienta estratégica para fomentar el respeto a la vida silvestre.  El objetivo del presente trabajo fue desarrollar un análisis del impacto de la educación ambiental en la conservación de la tortuga marina en Mazatlán, Sinaloa, México a lo largo de tres décadas de datos biológicos registrados con la finalidad de impulsar el turismo sostenible con posturas sociales más sólidas. En Mazatlán Sinaloa, cada año, durante la temporada de anidación de tortugas marinas (julio-octubre), se atraen a numerosos ecoturistas interesados en estos reptiles en peligro de extinción. Para ayudar a la protección y conservación de estos animales, hay instituciones públicas gubernamentales regionales y federales que tienen un rol en la educación ambiental y la conservación de la vida silvestre. Este trabajo involucra el abordaje de los animales en las playas con dinámicas turísticas con predominio antropocéntrico con el objetivo de educar a diversos actores sociales, donde los recursos naturales objeto de esta investigación son las tortugas marinas llamadas golfinas Lepidochelys olivacea (Eschscholtz, 1829). El Acuario Mazatlán con su programa de conservación de tortugas marinas ha logrado resguardar 15103 nidos; 1.393194 huevos; 1.103006 crías liberadas; 70,2 % de supervivencia y se registraron 290188 muertas por desastres naturales y otras causas. El turismo apoyado de la educación ambiental fomenta en el puerto una influencia en los residentes y turistas para el cuidado del patrimonio natural de los recursos naturales como las torturas. La presente investigación es un análisis multidisciplinario entre las ciencias educativas, biológicas, y socioculturales a partir de la revisión documental con entrevistas a profundidad con actores clave. Existe una interpretación conceptual donde los actores sociales, aprenden sobre la biología, conservación, amenazas y el respeto a la vida animal silvestre durante su visita al puerto sinaloense

Survival analysis of orange tree varieties in Spain

The fundamental basis of Spanish citriculture is its varietal composition, which contributes to the existence of a marketing calendar that extends to almost the entire year. As time goes by, the supply of varieties is continuously renewed, requiring significant investments by growers. The guarantee of a quality supply to the markets, on one hand, and the optimal result of the investments made, on the other, require that, in managing the sector, the characteristics determining the survival of the varieties be taken into account. The main purpose of this study was therefore to assess the influence of the attributes affecting the longevity of orange plantations from a technical and commercial point of view. The duration analysis technique applied to the different varieties has been used. The main attributes determining the elimination of a variety were the presence of seeds in the fruit and the tendency towards a decrease in surface size. Permanence- or survival-friendly attributes included the calibre (large size of the variety, within its group) and the price received by farmers. Precocity, frost resistance, commercial quality and resistance to fruit fly did not have the expected level of significance

On the energy functional on Finsler manifolds and applications to stationary spacetimes

In this paper we first study some global properties of the energy functional on a non-reversible Finsler manifold. In particular we present a fully detailed proof of the Palais--Smale condition under the completeness of the Finsler metric. Moreover we define a Finsler metric of Randers type, which we call Fermat metric, associated to a conformally standard stationary spacetime. We shall study the influence of the Fermat metric on the causal properties of the spacetime, mainly the global hyperbolicity. Moreover we study the relations between the energy functional of the Fermat metric and the Fermat principle for the light rays in the spacetime. This allows us to obtain existence and multiplicity results for light rays, using the Finsler theory. Finally the case of timelike geodesics with fixed energy is considered.Comment: 23 pages, AMSLaTeX. v4 matches the published versio

Superluminal X-shaped beams propagating without distortion along a coaxial guide

In a previous paper [Phys. Rev. E64 (2001) 066603; e-print physics/0001039], we showed that localized Superluminal solutions to the Maxwell equations exist, which propagate down (non-evanescence) regions of a metallic cylindrical waveguide. In this paper we construct analogous non-dispersive waves propagating along coaxial cables. Such new solutions, in general, consist in trains of (undistorted) Superluminal "X-shaped" pulses. Particular attention is paid to the construction of finite total energy solutions. Any results of this kind may find application in the other fields in which an essential role is played by a wave-equation (like acoustics, geophysics, etc.). [PACS nos.: 03.50.De; 41.20;Jb; 83.50.Vr; 62.30.+d; 43.60.+d; 91.30.Fn; 04.30.Nk; 42.25.Bs; 46.40.Cd; 52.35.Lv. Keywords: Wave equations; Wave propagation; Localized beams; Superluminal waves; Coaxial cables; Bidirectional decomposition; Bessel beams; X-shaped waves; Maxwell equations; Microwaves; Optics; Special relativity; Coaxial metallic waveguides; Acoustics; Seismology; Mechanical waves; Elastic waves; Guided gravitational waves.]Comment: plain LaTeX file (22 pages), plus 15 figures; in press in Phys. Rev.

Abelian and nonabelian vector field effective actions from string field theory

The leading terms in the tree-level effective action for the massless fields of the bosonic open string are calculated by integrating out all massive fields in Witten's cubic string field theory. In both the abelian and nonabelian theories, field redefinitions make it possible to express the effective action in terms of the conventional field strength. The resulting actions reproduce the leading terms in the abelian and nonabelian Born-Infeld theories, and include (covariant) derivative corrections.Comment: 49 pages, 1 eps figur

Performance of CUF approach to analyze the structural behavior of slender bodies

This paper deals with the accurate evaluation of complete three-dimensional (3D) stress fields in beam structures with compact and bridge-like sections. A refined beam finite-element (FE) formulation is employed, which permits any-order expansions for the three displacement components over the section domain by means of the Carrera Unified Formulation (CUF). Classical (Euler-Bernoulli and Timoshenko) beam theories are considered as particular cases. Comparisons with 3D solid FE analyses are provided. End effects caused by the boundary conditions are investigated. Bending and torsional loadings are considered. The proposed formulation has shown its capability of leading to quasi-3D stress fields over the beam domain. Higher-order beam theories are necessary for the case of bridge-like sections. Various theories are also compared in terms of shear correction factors on the basis of definitions found in the open literature. It has been confirmed that different theories could lead to very different values of shear correction factors, the accuracy of which is subordinate to a great extent to the section geometries and loading conditions. However, an accurate evaluation of shear correction factors is obtained by means of the present higher-order theories

Charge separation relative to the reaction plane in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm NN}}= 2.76 TeV

Measurements of charge dependent azimuthal correlations with the ALICE detector at the LHC are reported for Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV. Two- and three-particle charge-dependent azimuthal correlations in the pseudo-rapidity range $|\eta| < 0.8$ are presented as a function of the collision centrality, particle separation in pseudo-rapidity, and transverse momentum. A clear signal compatible with a charge-dependent separation relative to the reaction plane is observed, which shows little or no collision energy dependence when compared to measurements at RHIC energies. This provides a new insight for understanding the nature of the charge dependent azimuthal correlations observed at RHIC and LHC energies.Comment: 12 pages, 3 captioned figures, authors from page 2 to 6, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/286

A note on comonotonicity and positivity of the control components of decoupled quadratic FBSDE

In this small note we are concerned with the solution of Forward-Backward Stochastic Differential Equations (FBSDE) with drivers that grow quadratically in the control component (quadratic growth FBSDE or qgFBSDE). The main theorem is a comparison result that allows comparing componentwise the signs of the control processes of two different qgFBSDE. As a byproduct one obtains conditions that allow establishing the positivity of the control process.Comment: accepted for publicatio