La Revolución de los intangibles

Peer Reviewe

Paseo a través de la historia : Anatolia, el amanecer del hombre

Peer Reviewe

El Compostatge com a sistema de tractament de residus: compostatge de residus sòlids urbans - fangs de depuradores

L'augment de diferents residus orgànics i la problemàtica de la conservació del medi ambient ha comportat l'estudi de tècniques d'aprofitament d'aquests residus i la seva posterior utilització. Entre una de les nombroses tècniques, hi ha el "Compostatge" que dóna com a producte final el "Compost" (utilitzable com a adob o esmena orgánica en agricultura). En aquest treball pretenem de veure com podem realitzar aquest procés amb el mínim de despeses econòmiques així com de trobar una manera adequada de treure una mostra representativa de la pila, de la durada del procés i del tractament de la mostra per tal de realitzar els anàlisis.The increase of different types of organic refuses and the problem of the conservation of the natural environment has lead to the study of the techniques that make these refuses re-utilizable. Among these techniques we find the compostage which final product is known as the compost (utilizable in agriculture as fertilizer and as organic amendmend). In this study we try to explain how this process should be done being as cheap as possible and we also try to find the better way to sample (the sample mus representative of the pile) the time the process takes and the teatment of the sample in order to be analyzed.El aumento de diferentes residuos orgánicos y la problemática de la conservación del medio ambiente ha implicado el estudio de técnicas de aprovechamiento de estos residuos y su posterior utilización. Entre las numerosas técnicas está el "Compostage" que da como producto final el "Compost" (utilizable como abono o enmienda orgánica en agricultura). En este trabajo se pretende ver como realizar este proceso con el mínimo coste, así como encontrar una forma adecuada de sacar una muestra representativa de la pila, duración del proceso y tratamiento de la muestra para realizar los análisis

The Double Cover of the Icosahedral Symmetry Group and Quark Mass Textures

We investigate the idea that the double cover of the rotational icosahedral symmetry group is the family symmetry group in the quark sector. The icosahedral (A5) group was previously proposed as a viable family symmetry group for the leptons. To incorporate the quarks, it is highly advantageous to extend the group to its double cover, as in the case of tetrahedral (A4) symmetry. We provide the basic group theoretical tools for flavor model-building based on the binary icosahedral group I' and construct a model of the quark masses and mixings that yields many of the successful predictions of the well-known U(2) quark texture models.Comment: 10 pages, references added, typos in up quark mass matrix correcte

Imaginario Social : una aproximación desde la obra de Michel Maffesoli

En este texto presentamos una revisión, -a modo de ejercicio de reflexión colectiva-, de la extensa producción bibliográfica de Michel Maffesoli, buscando articular desde los supuestos presentes en su obra, la noción de imaginario social. Para comprender el contexto de producción de este sociólogo francés, hemos comenzado por hacer una breve revisión de sus principales trabajos e influencias teóricas. Posteriormente hemos centrado la reflexión sobre sus textos fundamentales: El conocimiento ordinario, La orgía, El tiempo de las tribus, Elogio de la razón sensible y El instante eterno. Finalmente, nos aproximamos a la intersección de su obra con el imaginario social de acuerdo a cuatro categorías temáticas propuestas por Enrique Carretero (2003): el significado de la utopía, la problemática en torno a la modernidad, la integración simbólica del neotribalismo y la legitimidad del orden social.In the following text we display a review, -a sort of collective reflection exercise-, regarding the extensive bibliographic production of Michel Maffesoli, trying to articulate the notion of social imaginary departing from the suppositions present in Maffesoli's work. In order to understand the production context of this French sociologist, we began by a brief review of his main work as well as other theoretical influences. Afterwards, his fundamental texts are the subject to a reflection: Ordinary Knowledge, The orgy, The Time of the Tribes, Praise of a Sensible Reason, and The Eternal Instant. Finally, several elements studied were integrated in an approach to the notion of social imaginary, facing four thematic categories following Enrique Carretero's (2003) proposals: utopia's meaning, problems concerning modernity, symbolic integration of neotribalism, and the legitimacy of social order

Towards Minimal S4 Lepton Flavor Model

We study lepton flavor models with the $S_4$ flavor symmetry. We construct simple models with smaller numbers of flavon fields and free parameters, such that we have predictions among lepton masses and mixing angles. The model with a $S_4$ triplet flavon is not realistic, but we can construct realistic models with two triplet flavons, or one triplet and one doublet flavons.Comment: 18 pages, 4 figures, references are adde

Gauging U(1) symmetries and the number of right-handed neutrinos

In this letter we consider that assuming: a) that the only left-handed neutral fermions are the active neutrinos, b) that $B-L$ is a gauge symmetry, and c) that the $L$ assignment is restricted to the integer numbers, the anomaly cancellation imply that at least three right-handed neutrinos must be added to the minimal representation content of the electroweak standard model. However, two types of models arise: i) the usual one where each of the three identical right-handed neutrinos has total lepton number L=1; ii) and the other one in which two of them carry L=4 while the third one carries $L=-5$.Comment: Published version in PLB forma