On Poisson quasi-Nijenhuis Lie algebroids

We propose a definition of Poisson quasi-Nijenhuis Lie algebroids as a natural generalization of Poisson quasi-Nijenhuis manifolds and show that any such Lie algebroid has an associated quasi-Lie bialgebroid. Therefore, also an associated Courant algebroid is obtained. We introduce the notion of a morphism of quasi-Lie bialgebroids and of the induced Courant algebroids morphism and provide some examples of Courant algebroid morphisms. Finally, we use paired operators to deform doubles of Lie and quasi-Lie bialgebroids and find an application to generalized complex geometry.Comment: 12 page

On Jacobi quasi-Nijenhuis algebroids and Courant-Jacobi algebroid morphisms

We propose a definition of Jacobi quasi-Nijenhuis algebroid and show that any such Jacobi algebroid has an associated quasi-Jacobi bialgebroid. Therefore, also an associated Courant-Jacobi algebroid is obtained. We introduce the notions of quasi-Jacobi bialgebroid morphism and Courant-Jacobi algebroid morphism providing also some examples of Courant-Jacobi algebroid morphisms.Comment: 14 pages, to appear in Journal of Geometry and Physic

A RELAÇÃO ENTRE NATUREZA E CAPITAL: reflexões a partir da discussão da Propriedade Privada da Terra

O presente artigo visa discutir a relação da natureza com o capital nos marcos da sociedade capitalista. Parte-se de uma revisão bibliográfica, à luz da teoria marxista, compreendendo que a natureza pode apreendida a partir do materialismo histórico dialético. Nessa direção, buscar-se-á realizar num primeiro momento uma reflexão a partir da constituição da propriedade privada da terra enquanto um elemento fundante para a acumulação e circulação do capital. Num segundo momento, buscar-se-á apontar alguns elementos da contradição entre natureza e capital no atual estágio de desenvolvimento capitalista. Por fim, expõem-se algumas breves considerações finais, sem a pretensão de esgotamento a respeito da temática

A Frame-Based System for Automatic Classification of Semi- Structured Data

The problem of data classification goes back to the definition oftaxonomies covering knowledge areas. With the advent of the Web, the amount of data available increased several orders of magnitude, making manual data classification impossible. This work presents a tool to automatically classify semi-structured data, represented by frames, without any previous knowledge about structured classes. The tool uses a variation of the K-Medoid algorithm and organizes a set of frames into classes, structured as a strict hierarchy

Agrarian analysis of the land multi-functionality in the Alicante Province - Spain

Con el fin de la dictadura franquista (1975) y la entrada en la Unión Europea en 1986, España pasó a recibir un fuerte apoyo financiero (ayudas y subvenciones) del Fondo Europeo de Orientación y Garantía Agaria (FEOGA) y de la Política Agrícola Común (PAC). Estas ayudas han tenido una importancia capital en la reciente transformación de los espacios rurales españoles. En el caso de la provincia de Alicante – España, durante las últimas décadas ha pasado por un intenso proceso de alteración territorial y socioambiental, teniendo en el agua el principal factor de sostenibilidad ambiental de los sistemas productivos (industriales y agrícolas), sin olvidar el papel que han representado también las fuertes inversiones aplicadas en las áreas turísticas. Con relación a la estructura de las explotaciones agropecuarias, en la provincia de Alicante predominan las pequeñas empresas rurales con cultivos de secano (almendro, olivo, viñedo de vinificación, etc.) y también de regadío (cítricos, hortalizas, frutales, etc.). Así, la implantación de las políticas agrícolas de la Unión Europea en el campo alicantino, a través del concepto de multifuncionalidad rural, ha ocasionado un aumento de la concentración de las explotaciones, el empobrecimiento y abandono de los pequeños y medianos agricultores, el aumento de la concurrencia de los productos foráneos, los incentivos para la especulación inmobiliaria, teniendo ala turismo como vector principal.The of Franco’s dictatorship (1975) and the admittance to the European Union (1986) enable Spain to get strong financial support (subsides) from the Agrarian Undertaking Funds (FEOGA) and from the Common Agricultural Policy (PAC). These investments had changed Spain into an industrialized and agricultural country. In the last decades the Alicante Province has undergone profound processes of socio-environmental and territorial changes, being water the main aspect of environmental sustainability of the productive systems (industrial and agricultural), as well as the strong investments into touristic areas. As regard to the agrarian structure, inside the Alicante province prevails the small rural properties with dry (grape, olive, etc.) and irrigated (vegetables, citrus, etc.) farming. Therefore, the implantation of agricultural policies from the European Union into the Alicante province, by the concept of rural multi-functionality, has increased the agrarian concentration, the pauperization of the small producers and has increased also the competition with external products and the incentive to the speculation, being the tourism the main vector

Predicting hotel bookings cancellation with a machine learning classification model

Booking cancellations have significant impact on demand-management decisions in the hospitality industry. To mitigate the effect of cancellations, hotels implement rigid cancellation policies and overbooking tactics, which in turn can have a negative impact on revenue and on the hotel reputation. To reduce this impact, a machine learning based system prototype was developed. It makes use of the hotel’s Property Management Systems data and trains a classification model every day to predict which bookings are “likely to cancel” and with that calculate net demand. This prototype, deployed in a production environment in two hotels, by enforcing A/B testing, also enables the measurement of the impact of actions taken to act upon bookings predicted as “likely to cancel”. Results indicate good prototype performance and provide important indications for research progress whilst evidencing that bookings contacted by hotels cancel less than bookings not contacted.info:eu-repo/semantics/acceptedVersio