Semiclassical Quantisation of Finite-Gap Strings

We perform a first principle semiclassical quantisation of the general finite-gap solution to the equations of a string moving on R x S^3. The derivation is only formal as we do not regularise divergent sums over stability angles. Moreover, with regards to the AdS/CFT correspondence the result is incomplete as the fluctuations orthogonal to this subspace in AdS_5 x S^5 are not taken into account. Nevertheless, the calculation serves the purpose of understanding how the moduli of the algebraic curve gets quantised semiclassically, purely from the point of view of finite-gap integration and with no input from the gauge theory side. Our result is expressed in a very compact and simple formula which encodes the infinite sum over stability angles in a succinct way and reproduces exactly what one expects from knowledge of the dual gauge theory. Namely, at tree level the filling fractions of the algebraic curve get quantised in large integer multiples of hbar = 1/lambda^{1/2}. At 1-loop order the filling fractions receive Maslov index corrections of hbar/2 and all the singular points of the spectral curve become filled with small half-integer multiples of hbar. For the subsector in question this is in agreement with the previously obtained results for the semiclassical energy spectrum of the string using the method proposed in hep-th/0703191. Along the way we derive the complete hierarchy of commuting flows for the string in the R x S^3 subsector. Moreover, we also derive a very general and simple formula for the stability angles around a generic finite-gap solution. We also stress the issue of quantum operator orderings since this problem already crops up at 1-loop in the form of the subprincipal symbol.Comment: 53 pages, 22 figures; some significant typos corrected, references adde

Foraminífers per datar sediments

Des del grup de Micropaleontologia de la Universitat Autònoma de Barcelona s'ha dut a terme un estudi acurat sobre l'arquitectura de la closca d'un important grup de macroforaminífers (organismes unicel·lulars) del cretaci superior. Els resultats han aportat informació valuosa sobre la tendència evolutiva en les estructures de les closques d'aquest grup i ha confirmat la utilitat de les diferents espècies a l'hora de datar sediments que es van dipositar en ambients marins de poca profunditat i d'aigües càlides i tranquil·les, properes a la costa.Des de el grupo de Micropaleontología de la Universidad Autónoma de Barcelona ha llevado a cabo un estudio cuidadoso sobre la arquitectura de la cáscara de un importante grupo de macroforaminíferos (organismos unicelulares) del cretáceo superior. Los resultados han aportado información valiosa sobre la tendencia evolutiva en las estructuras de los caparazones de este grupo y ha confirmado la utilidad de las diferentes especies a la hora de datar sedimentos que se depositaron en ambientes marinos de poca profundidad y de aguas cálidas y tranquilas, cercanas a la cost

Large Winding Sector of AdS/CFT

We study a family of classical strings on R x S^3 subspace of the AdS_5 x S^5 background that interpolates between pulsating strings and single-spike strings. They are obtained from the helical strings of hep-th/0609026 by interchanging worldsheet time and space coordinates, which maps rotating/spinning string states with large spins to oscillating states with large winding numbers. From a finite-gap perspective, this transformation is realised as an interchange of quasi-momentum and quasi-energy defined for the algebraic curve. The gauge theory duals are also discussed, and are identified with operators in the non-holomorphic sector of N=4 super Yang-Mills. They can be viewed as excited states above the ``antiferromagnetic'' state, which is ``the farthest from BPS'' in the spin-chain spectrum. Furthermore, we investigate helical strings on AdS_3 x S^1 in an appendix.Comment: 1+52 pages, 10 figures, v2: references and comments added, v3: minor changes and a reference adde

The interrelationship between the demands of Corporate Social Responsibility and co-operative principles and values

Corporate Social Responsibility (CSR) and its integrated management in companies is leading to a new company model that willingly expands its concerns by giving equal consideration to economic, social and environmental aspects. Cooperative societies, in paying attention to the principles and values that define them, as shown in this work, are demonstrating that there is a close interrelationship with the basic demands of CSR, which can be a competitive advantage as long as it is driven by a strategy that leads to its integrated management. The singular structure and democratic composition of a cooperative’s management structure can guarantee the total integration of stakeholders in the decision-making process, as they are often not only owners, but also clients, suppliers and employees.Corporate Social Responsibility, management, interest groups, cooperatives, stakeholders.

Role of Jasmonic Acid Pathway in Tomato Plant-Pseudomonas syringae Interaction

The jasmonic acid pathway has been considered as the backbone of the response against necrotrophic pathogens. However, a hemi-biotrophic pathogen, such as Pseudomonas syringae, has taken advantage of the crosstalk between the different plant hormones in order to manipulate the responses for its own interest. Despite that, the way in which Pseudomonas syringae releases coronatine to activate jasmonic acid-derived responses and block the activation of salicylic acid-mediated responses is widely known. However, the implication of the jasmonic intermediates in the plant-Pseudomonas interaction is not studied yet. In this work, we analyzed the response of both, plant and bacteria using SiOPR3 tomato plants. Interestingly, SiOPR3 plants are more resistant to infection with Pseudomonas. The gene expression of bacteria showed that, in SiOPR3 plants, the activation of pathogenicity is repressed in comparison to wild type plants, suggesting that the jasmonic acid pathway might play a role in the pathogenicity of the bacteria. Moreover, treatments with JA restore the susceptibility as well as activate the expression of bacterial pathogenicity genes. The observed results suggest that a complete jasmonic acid pathway is necessary for the susceptibility of tomato plants to Pseudomonas syringae

Islamisme gihadista i nihilisme. El component nihilista de la igeologia gihadista

Treballs Finals de Grau de Ciència Política i de l'Administració, Facultat de Dret, Universitat de Barcelona, Curs: 2014-2015 , Tutor: Joan Antón MellónEl gihadisme va aixecar un enorme interès al món occidental arrel dels atemptats de l’11-S i les posteriors reaccions del govern dels EUA que durien a una globalització del fenomen del terrorisme islàmic. La “resurrecció” del fenomen amb el sorgiment de l’Estat Islàmic i totes les seves conseqüències i brutalitat despertarien de nou les alarmes a occident i retornarien el gihadisme a les primeres planes dels mitjans de comunicació occidentals, com a mínim durant un temps. Tot i la importància i la gravetat de la amenaça del gihadisme per a Occident, no s’hauria presentat, com a mínim en l’esfera pública, un esforç per explicar i publicar les causes del nou gihadisme que encarna l’Estat Islàmic, i tota explicació de les autoritats es limitaria a la seva consideració com una simple corrent més d’un gihadisme purament destructor i nihilista sense cap projecte o fonament al seu darrera

A social network-based organizational model for improving knowledge management in supply chains

Purpose: This paper aims to provide a social network-based model for improving knowledge management in multi-level supply chains formed by small and medium-sized enterprises (SMEs). Design/methodology/approach: This approach uses social network analysis techniques to propose and represent a knowledge network for supply chains. Also, an empirical experience from an exploratory case study in the construction sector is presented. Findings: This proposal improves the establishment of inter-organizational relationships into networks to exchange the knowledge among the companies along the supply chain and create specific knowledge by promoting confidence and motivation. Originality/value: This proposed model is useful for academics and practitioners in supply chain management to gain a better understanding of knowledge management processes, particularly for the supply chains formed by SMEs. © Emerald Group Publishing Limited.Capó-Vicedo, J.; Mula, J.; Capó I Vicedo, J. (2011). 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