Rudiments of Holography

An elementary introduction to Maldacena's AdS/CFT correspondence is given, with some emphasis in the Fefferman-Graham construction. This is based on lectures given by one of us (E.A.) at the Universidad Autonoma de Madrid.Comment: 60 pages, additional misprints corrected, references adde

Premios Nobel de Economía

Con esta sección, la revista Semestre Económico desea entregar a sus lectores un espacio informativo donde se consignen apartes del pensamiento económico y sus aportes a esta disciplina, teniendo en cuenta el momento y los contextos donde cambios estructurales se han dado, para que tales trabajos hayan contribuido al desarrollo de la Economía.Inicialmente, se ha pensado en quienes han trabajado desde la década de los sesenta, cuyos planteamientos se han perfilado a la solución de algunos problemas económicos que generalmente han brillado por su carácter teórico, técnico, de formalización matemática de modelos y, últimamente, por atención a la parte social. Son, en resumidas cuentas, aquellos trabajos que se identifican con los Premios Nobel de Economía

The Dirichlet Obstruction in AdS/CFT

The obstruction for a perturbative reconstruction of the five-dimensional bulk metric starting from the four-dimensional metric at the boundary,that is, the Dirichlet problem, is computed in dimensions $6\leq d\leq 10$ and some comments are made on its general structure and, in particular, on its relationship with the conformal anomaly, which we compute in dimension $d=8$.Comment: 13 pages, references added (this paper supersedes hep-th/0206140, "A Note on the Bach Tensor in AdS/CFT", which has been withdrawn

Temporal Bacteriostatic Effect and Growth Factor Loss in Equine Platelet Components and Plasma Cultured with Methicillin-Sensitive and Methicillin-Resistant Staphylococcus aureus

The aims were (1) to evaluate the bacteriostatic effect of platelet-rich plasma (PRP), platelet-rich gel (PRG), leukocyte-poor plasma (LPP), leukocyte-poor gel (LPG), plasma, and heat-inactivated plasma (IP) on both methicillin-sensitive Staphylococcus aureus (MSSA) and methicillin-resistant Staphylococcus aureus (MRSA) over a period of 24 h; (2) to determine and to compare the concentrations and degradation over time of platelet factor 4 (PF-4), transforming growth factor beta 1 (TGF-β1), and platelet-derived growth factor isoform BB (PDGF-BB); and (3) to identify any correlations between MSSA and MRSA growth and either the cellular, PF-4, TGF-β1, or PDGF-BB concentrations in the blood components. PRP and its byproducts from 18 horses were obtained by the tube method. All blood components were cultured with either MSSA or MRSA. Bacterial growth, PF-4, TGF-β1, and PDGF-BB were determined at 6 h and 24 h. At six hours, bacterial growth was significantly inhibited by all blood components, with the exception of IP. MSSA was more sensitive to the treatments than MRSA. At 24 hours, bacterial growth was significantly higher in IP. MRSA bacterial growth was significantly higher in PRP, LPP, and plasma when compared to MSSA. Growth factor concentrations were not significantly affected by bacteria

Using a regulator for a servomotor model designed for a prosthetic joint

Through the modern control theory it is possible to face any problem situation using state equations without considering mathematical rules used from recursive algorithms. The simplification of the various developments will be reflected with new findings, giving values to new concepts such as controllability and stability. This paper seeks to find new work items of the servomotor system by using a regulator, allowing a more controllable and stable performance. The servomotor presented here is designed to generate joint movements of a robotic arm designed for movement rehabilitation of a patient.V Workshop Procesamiento de Señales y Sistemas de Tiempo RealRed de Universidades con Carreras de Informática (RedUNCI

Using a regulator for a servomotor model designed for a prosthetic joint

Through the modern control theory it is possible to face any problem situation using state equations without considering mathematical rules used from recursive algorithms. The simplification of the various developments will be reflected with new findings, giving values to new concepts such as controllability and stability. This paper seeks to find new work items of the servomotor system by using a regulator, allowing a more controllable and stable performance. The servomotor presented here is designed to generate joint movements of a robotic arm designed for movement rehabilitation of a patient.V Workshop Procesamiento de Señales y Sistemas de Tiempo RealRed de Universidades con Carreras de Informática (RedUNCI

La Colmena. Veinticinco años de pasión por las humanidades

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Presentación del núm. 102.Presentación del núm. 102

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Presentacion of no. 103 of La Colmena.Presentación del núm. 103 de La Colmena

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Presentation of núm. 101 of La Colmena.Presentación del núm. 101 de la revista La Colmena