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Nomenclatura Unesco > (22) Física

Mostrando recursos 181 - 200 de 72,538

181. Quasi-exactly solvable models in nonlinear optics - Álvarez Galindo, Gabriel; Finkel Morgenstern, Federico; González López, Artemio; Rodríguez González, Miguel Ángel
We study a large class of models with an arbitrary (finite) number of degrees of freedom, described by Hamiltonians which are polynomial in bosonic creation and annihilation operators, and including as particular cases nth harmonic generation and photon cascades. For each model, we construct a complete set of commuting integrals of motion of the Hamiltonian, fully characterize the common eigenspaces of the integrals of motion and show that the action of the Hamiltonian on these common eigenspaces can be represented by a quasiexactly solvable reduced Hamiltonian, whose expression in terms of the usual generators of sl_2 is computed explicitly.

182. Synthesis of gold nanorods for biomedical applications - García, M. A.; Bouzas, V.; Carmona Tejero, Noemí
Gold nanoparticles are commonly used in biomedical applications due to their high biocompatibility and easy modular functionality. Their unique optical properties, such as Surface Plasmon Resonance (SPR), lead to a great light absorption in the visible range of the spectrum. Here, we show that the synthesis of non spherical gold nanoparticles causes the maximum absorption band to shift to the near-infrared region of the spectrum, thus avoiding overlaps with other biological tissues (eg. Haemoglobin in bloodstream).

183. Aptasensors based on electrochemical impedance spectroscopy - Ocaña Tejada, Cristina
En els últims anys, a causa de la necessitat de diàgnostics ràpids i de millores en sensat, s’han utilitzat nous elements de reconeixement en biosensors. Un tipus d’aquests nous elements de reconeixement són els aptàmers. Els aptàmers són cadenes sintètiques de ADN o ARN les quals són seleccionades in vitro i tenen la capacitat d’unir-se a proteïnes, ions, cèl.lules, fàrmacs i lligands de baix pes molecular, reconeixent les seves molècules diana amb alta afinitat i especificitat. Diversos biosensors basats en aptàmers, també anomenats aptasensors, han sigut desenvolupats recentment. D’entre totes les tècniques de transducció utilitzades en biosensors, l’Espectrocòpia Electroquímica d’Impedància...

184. Plasmonic nanoengineering in hollow metal nanostructures: an electron energy-loss spectroscopy study - Genç, Aziz
Resumen en Español Las nanoestructuras metálicas están siendo objeto de gran atención dada su capacidad para generar resonancias plasmónicas, que son oscilaciones colectivas de electrones alojados en la banda de conducción en un metal excitado por efecto de un campo electromagnético. El creciente interés entorno a las nanoestructuras metálicas como fuentes de plasmones, ha resultado en el desarrollo de un nuevo campo, la plasmónica, definida como la ciencia y tecnología de la generación, control y manipulación de las excitaciones resultantes de las interaciones de la luz con la materia. Las nanoestructuras plasmónicas encuentran aplicaciones en diversos campos que cubren biología, física,...

185. Aplicación de la ultra alta presión de homogenización (UHPH) en la elaboración de licuados vegetales de almendra de alta calidad - Valencia Flores, Dora Cecilia
La bebida de almendra ha experimentado en los últimos años un notable aumento en su consumo, y por tanto, se ha expandido el área de comercialización de este producto, en casi todo el mundo. Esta bebida, además de ser una alternativa a la leche (aunque no son comparables) para personas con intolerancia a los productos lácteos, se demanda por sus cualidades funcionales que pueden contribuir a reducir o prevenir enfermedades, que aquejan en la actualidad a la sociedad; esto debido principalmente al contenido de ácidos grasos poliinsaturados y monoinsaturados, y a las fracciones con propiedades antioxidantes, como vitamina E, compuestos fenólicos, flavonoides y poliaminas. El principal propósito de...

186. Estado do Rio de Janeiro (LABSAU/UERJ). - De Física Da Aeronáutica (icaf; Marcelo Daltro; Roberto Simão; Marcos Polito; Walace Monteiro
Acute cardiovascular responses in strenght training conducted in exercises for large and small muscular groups

187. EGP = Exterior Gateway Protocol IGP = Interior Gateway Protocol - Routers Ip; Altas Prestaciones; Basado En T. Griffin; Redes Internas De Isps; Aprox Unos; En Uso (agosto; Basado En Métrica Ospf; Rip Eigrp (cisco
Colección de redes físicas, unidas, usando IP, que tienen una política adminstrativa de encaminamiento común Autonomous Systems (ASes) Un autonomous system es un autonomous routing domain al que le ha sido asignado un Autonomous System Number (ASN). RFC 1930: Guía para la creación, selección, y registro de Autonomous System … la administración de un AS ofrece a otros ASes un esquema coherente de encaminamiento interior y de alcazabilidad a otras redes a traves de ella. AS Numbers (ASNs) ASNs son valores de 16 bit. 64512 a 65535 son “privados”

188. $rec.titulo - Universidad Nacional; De Córdoba; Facultad De Matemática; Astronomía Y Física; Trabajos De Matematica; Jorge Lauret; Cynthia E. Will; Jorge Lauret; Cynthia E. Will
On anosov automorphisms of nilmanifolds

189. REGIONAL DROUGHT IN THE SOUTHERN OF SOUTH AMERICA- PHYSICAL ASPECTS - Juan Leonidas Minetti; Walter Mario Vargas; Arnobio German; Poblete; Maria Elvira Bobba; Consejo Nacional De Ciencia Y
From the indices of monthly and annual climatic drought in six regions in southern South America and their associations with seventeen predictors, the probable physical causes of droughts are analyzed. These indices are used in operational climate monitoring and describe the atmospheric temperature and sea surface temperature (SST) near South America. Subtropical anticyclone activity over both coasts of South America is one of the main predictors, together with its interaction with the continental depression and SST at the coast of Brazil. The highest predictability concentrates in November-December-May and the lowest in March, June and August. In the sub regional scale,...

190. ADDITIONAL KEYWORDS - Evaluación De; La Capacidad; Física De; Caballos Pantaneiros; Y Otras; Razas Durante; Cabalgadas En; El Pantanal; Palabras Clave Adicionales
Tasa cardiaca. Ácido láctico. Cabalgada.

191. PHYSICAL JOURNAL B c© EDP Sciences - Societa Italiana Di Fisica; M. Yu. Kagan; D. I. Khomskii A; M. V. Mostovoy
Abstract. We study the competition between dierent possible ground states of the double-exchange model with strong ferromagnetic exchange interaction between itinerant electrons and local spins. Both for classi-cal and quantum treatment of the local spins the homogeneous canted state is shown to be unstable against a phase separation. The conditions for the phase separation into the mixture of the antiferromagnetic and ferromagnetic/canted states are given. We also discuss another possible realization of the phase-separated state: ferromagnetic polarons embedded into an antiferromagnetic surrounding. The general picture of a percolated state, which emerges from these considerations, is discussed and compared with results...

192. RESUMO - Rev Bras; Anestesiol Artigo Científico; Marcolino Jam; Suzuki Fm; Alli Lac; Gozzani Jl; Mathias Last
tidos a um procedimento cirúrgico experimentam ansiedade. A an-siedade e a depressão são os distúrbios mais associados às doenças físicas. Na Escala Hospitalar de Ansiedade e Depressão (HADS) não figuram itens que poderiam estar presentes em doen-ças físicas e na ansiedade e na depressão. O objetivo deste es-tudo foi medir a freqüência e o nível da ansiedade e da depressão em pacientes no pré-operatório e em um grupo-controle. MÉTODO: Setenta e nove pacientes internados no Departamento de Cirurgia da Santa Casa de São Paulo e 56 acompanhantes respon-deram a um questionário de dados sociodemográficos e a HADS. RESULTADOS: A avaliação...

193. physics/0111033 UPGRADE OF THE CONTROL SYSTEM OF THE IFUNAM´S PELLETRON ACCELERATOR - R. Macías; E. Chávez; M. E. Ortiz; K. López; A. Huerta; M. C. Verde
In 1995 a 9SDH-2 Pelletron from NEC was installed at IFUNAM (Instituto de Física, Universidad Nacional Autónoma de México). Two beam lines have been operational since then and two new lines have been built. In order to implement planned projects in this mature facility, an upgrading of the original manual control system is required. The proposed new control system takes advantage of the existing devices and incorporates the electronics needed for the newer beam lines. The control software from NEC, has been modified to accommodate the larger requirements. It runs on the same dedicated computer but receives commands from a...

194. 2 Departamento de Física- Universidade Tecnológica Federal do Paraná (UTFPR) - Frederico Campos Freitas; Fabiano Kuller; Márcia Muller; José Luís Fabris; Cyro Ketzer Saul
Developed in the 90`s, the Long Period Grating (LPG) consists of a periodic refractive index modulation over a specific length of a single mode optical fiber used in telecommunications. The created index grating promotes coupling between the core and cladding modes, resulting in a transmitted spectrum that shows some attenuation dips over a well-defined range of wavelengths. Any change in the effective refractive indexes of the fiber due to changes in the surrounding environment refractive index, stress or temperature generates a shift in the LPG resonance wavelength. Based on this effect it is possible to fabricate both physical and chemical...

195. CHIRAL FIELD IDEAS FOR A THEORY OF MATTER - Ideas De; Campo Quiral; Para Una; Teoría De; La Materia; H. Torres-silva
En este trabajo, para el desarrollo de una teoría unicada de campos electromagnéticos y gravitacionales se usa un método quiral. Los fotones que satisfacen las ecuaciones de Maxwell, para una onda electromagnética se consideran como componentes físicos básicos. El objetivo de esta teoría es unicar el fenómeno de la invarianza relativística, mecánica de onda y la creación del par electrón positrón, con las ecuaciones de Maxwell, para obtener una teoría de la materia totalmente electromagnética. Considerando esta teoría se discuten algunos aspectos de los sistemas GPS (Global Positioning Systems). Palabras clave: Potencial quiral, teoría de la materia, onda-partícula. In this...

196. Semileptonic K L Decays At Na48 M. Veltri - Istituto Di Fisica; M. Veltri; Infn Sezione Firenze
Introduction The NA48 experiment at the CERN SPS has been exploited in a rich program of kaon physics. The existence of direct CP violation in the decay of two pions was demonstrated and many rare kaon decay searches as well as high precision measurements have been carried out. Here will be reported three recent measurements of semileptonic K L decays, namely the K e3 branching ratio together with a determination of the CKM matrix element |, the K e3 form factors and the K e3# branching ratio. The most relevant component of the NA48 detector 1 are a high resolution...

197. Effective statistical weights of bound states in plasmas - Società Italiana Di Fisica; D. V. Fisher A; Y. Maron
Abstract. Based on recent advances in the study of the statistics of interparticle distances and angles in plasmas, we develop an approach for the determination of the effective statistical weights of atomic (ionic) quantum states in ideal and nonideal plasmas. This approach allows one to account naturally for the effects

198. Asymptotic Behavior of RA-estimates in Autoregressive 2D - Facultad De Matemática; Astronomía Y Física
In this work we study the asymptotic behavior of a robust class of estimator of coe ¢ cients of AR-2D process. We established the consistency and asymptotic normality of the RA estimator under precise conditions. This class of models has diverse applications in image modeling and statistical image processing.

199. Thermodynamics and transport in an active Morse ring chain - Societa Italiana Di Fisica; J. Dunkela; W. Ebeling; U. Erdmann
Abstract. We investigate the stochastic dynamics of an one-dimensional ring with N self-driven Brownian particles. In this model neighboring particles interact via conservative Morse potentials. The influence of the surrounding heat bath is modeled by Langevin-forces (white noise) and a constant viscous friction coecient γ0. The Brownian particles are provided with internal energy depots which may lead to active motions of the particles. The depots are realized by an additional nonlinearly velocity-dependent friction coecient γ1(v) in the equations of motions. In the rst part of the paper we study the partition functions of time averages and thermodynamical quantities (e.g. pressure)...

200. Laurea in Fisica 2000; Final Grade 110/110 - Cristiano Nisoli; Post Doctoral; Scholar Penn; Advisor Prof; Vincent H. Crespi; Advisors Prof; Giovanni Prosperi; Prof Daniela Zanon
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