An accurate density functional theory for the vapor-liquid interface of associating chain molecules based on the statistical associating fluid theory for potentials of variable range.

Published versio

Can the use of interactive mediation tools influence the identity proximity between the public and the art museum?

The public and the art museum identity on the one hand, and context on the other hand, seem to influence consumer behaviour in the museum field. It’s not about changing the museum content, but about approaching its identity to the public’s identity, in order to allow access to art. In the first part, we present the theoretical and conceptual framework of the research. A second part will propose the implementation of a qualitative methodological approach and the results exploitation that will let us answer to the previous questions

Design and operation of a rainfall simulator for field studies of runoff and soil erosion

[Abstract] The present paper describes the design, construction, calibration and operation of a spray rainfall simulator . The design of the plots used for the purpose of this study is also described in order to determine hydrological and erosion parameters. Selected rainfall intensity of 64 mm h- 1 are representative of heavy storm conditions in Galicia. Drop size distribution results in these conditions , a D5 0of 1.2 mm, were similar to those calculated for natural rainfall by BUBENZER (1979). Fall velocities reached were between 75 and 100% terminal velocity, depending on drop diameter and 13.05 Jm- 2m m- 1kinetic energy was obtained Surface area of the plots used was 1 m2, surronded by a metal structure connected to a V-shaped system to collect the surface runoff and sediment produced in the different experiments

Análisis multidisciplinar de la delincuencia socioeconómica

Traballo fin de grao (UDC.DER). Dereito. Curso 2012/201

Transverse Symmetry and Spin-3/2 Fields

We study the possible covariant Lagrangians that describe the propagation of pure spin-3/2 particles. We show that, apart from the well-known Rarita-Schwinger Lagrangian, there is another possibility where the field is described by a gamma-traceless combination and that both Lagrangians yield the same physical predictions for the interaction of conserved sources. We also prove that for the case when the spin-2 field is described by a traceless field, there is no possible spin-3/2 action that makes the system supersymmetric. Nevertheless, the interaction between this field andthe spin-3/2 field may be possible.Comment: 12 pages. To appear in Peyresq XII proceeding

New derivation of soliton solutions to the AKNS2_2 system via dressing transformation methods

We consider certain boundary conditions supporting soliton solutions in the generalized non-linear Schr\"{o}dinger equation (AKNS$_r$)\,($r=1,2$). Using the dressing transformation (DT) method and the related tau functions we study the AKNS$_{r}$ system for the vanishing, (constant) non-vanishing and the mixed boundary conditions, and their associated bright, dark, and bright-dark N-soliton solutions, respectively. Moreover, we introduce a modified DT related to the dressing group in order to consider the free field boundary condition and derive generalized N-dark-dark solitons. As a reduced submodel of the AKNS$_r$ system we study the properties of the focusing, defocusing and mixed focusing-defocusing versions of the so-called coupled non-linear Schr\"{o}dinger equation ($r-$CNLS), which has recently been considered in many physical applications. We have shown that two$-$dark$-$dark$-$soliton bound states exist in the AKNS$_2$ system, and three$-$ and higher$-$dark$-$dark$-$soliton bound states can not exist. The AKNS$_r$\,($r\geq 3$) extension is briefly discussed in this approach. The properties and calculations of some matrix elements using level one vertex operators are outlined.Comment: 34 pages, 3 figures. Extended version of arXiv:1110.3108[nlin.SI], to appear in J. Phys. A: Math. Theo

GABA(A )receptor γ2 subunit knockdown mice have enhanced anxiety-like behavior but unaltered hypnotic response to benzodiazepines

BACKGROUND: Gamma-aminobutyric acid type A receptors (GABA(A)-Rs) are the major inhibitory receptors in the mammalian brain and are modulated by a number of sedative/hypnotic drugs including benzodiazepines and anesthetics. The significance of specific GABA(A)-Rs subunits with respect to behavior and in vivo drug responses is incompletely understood. The γ2 subunit is highly expressed throughout the brain. Global γ2 knockout mice are insensitive to the hypnotic effects of diazepam and die perinatally. Heterozygous γ2 global knockout mice are viable and have increased anxiety-like behaviors. To further investigate the role of the γ2 subunit in behavior and whole animal drug action, we used gene targeting to create a novel mouse line with attenuated γ2 expression, i.e., γ2 knockdown mice. RESULTS: Knockdown mice were created by inserting a neomycin resistance cassette into intron 8 of the γ2 gene. Knockdown mice, on average, showed a 65% reduction of γ2 subunit mRNA compared to controls; however γ2 gene expression was highly variable in these mice, ranging from 10–95% of normal. Immunohistochemical studies demonstrated that γ2 protein levels were also variably reduced. Pharmacological studies using autoradiography on frozen brain sections demonstrated that binding of the benzodiazepine site ligand Ro15-4513 was decreased in mutant mice compared to controls. Behaviorally, knockdown mice displayed enhanced anxiety-like behaviors on the elevated plus maze and forced novelty exploration tests. Surprisingly, mutant mice had an unaltered response to hypnotic doses of the benzodiazepine site ligands diazepam, midazolam and zolpidem as well as ethanol and pentobarbital. Lastly, we demonstrated that the γ2 knockdown mouse line can be used to create γ2 global knockout mice by crossing to a general deleter cre-expressing mouse line. CONCLUSION: We conclude that: 1) insertion of a neomycin resistance gene into intron 8 of the γ2 gene variably reduced the amount of γ2, and that 2) attenuated expression of γ2 increased anxiety-like behaviors but did not lead to differences in the hypnotic response to benzodiazepine site ligands. This suggests that reduced synaptic inhibition can lead to a phenotype of increased anxiety-like behavior. In contrast, normal drug effects can be maintained despite a dramatic reduction in GABA(A)-R targets

Reducción de los tiempos de observación en la evaluación del observación en la evaluación del comportamiento de conejas en producción. Análisis metodológico.

El objetivo de este trabajo fue evaluar diferentes técnicas de muestreo que redujeran el tiempo total de observación necesario para estimar el comportamiento de conejas alojadas en dos tipos de jaulas (convencionales vs. enriquecidas) y en dos estados fisiológicos distintos (gestantes vs. lactantes). Para ello, se compararon grabaciones completas de 24 h (método control de referencia) con estimaciones obtenidas a partir de grabaciones de diferente duración y frecuencia (métodos regular corto y regular largo y métodos irregulares de 6h y de 8h). A partir de los resultados obtenidos se observa que los métodos regulares se ajustaron mejor al método de referencia de 24h que los irregulares. Desde un punto de vista práctico el método regular corto sería el ideal, al reducir considerablemente el número total de horas de observación y análisi

Descriptive study of production factors affecting performance traits in growing-finishing pgis in Spain.

The objective of this study was to build up a data set including productive performance and production factors data of growing-finishing (GF) pigs in Spain in order to perform a representative and reliable description of the traits of Spanish growing-finishing pig industry. Data from 764 batches from 452 farms belonging to nine companies (1,157,212 pigs) were collected between 2008 and 2010 through a survey including five parts: general, facilities, feeding, health status and performance. Most studied farms had only GF pigs on their facilities (94.7%), produced ‘industrial’ pigs (86.7%), had entire male and female (59.5%) and Pietrain-sired pigs (70.0%), housed between 13-20 pigs per pen (87.2%), had 50% of slatted floor (70%), single-space dry feeder (54.0%), nipple drinker (88.7%) and automatic ventilation systems (71.2%). A 75.0% of the farms used three feeding phases using mainly pelleted diets (91.0%), 61.3% performed three or more antibiotic treatments and 36.5% obtained water from the public supply. Continuous variables studied had the following average values: number of pigs placed per batch, 1,515 pigs; initial and final body weight, 19.0 and 108 kg; length of GF period, 136 days; culling rate, 1.4%; barn occupation, 99.7%; feed intake per pig and fattening cycle, 244 kg; daily gain, 0.657 kg; feed conversion ratio, 2.77 kg kg-1 and mortality rate, 4.3%. Data reflecting the practical situation of the Spanish growing and finishing pig production and it may contribute to develop new strategies in order to improve the productive and economic efficiency of GF pig units