Search Results (All Fields:"oceanic") - e-spacio
http://e-spacio.uned.es/fez/
Universidad Nacional de Educación a DistanciaspFez 2.1 RC3http://blogs.law.harvard.edu/tech/rssEstudio de las aptitudes docentes del sistema integrado de diseño de ASICS SEMICUSTOM OCEAN.
http://e-spacio.uned.es/fez/view/taee:congreso-1996-1026
Este trabajo trata del entorno de desarrollo OCEAN, desarrollado por el Departamento de Ingeniería eléctrica de laUniversidad de Delf (Holanda), orientado al diseño de circuitos integrados semicustom basados en Sea-of-Gates. Tras una breve introducción al mismo, haremos un análisis de de la aplicación desde un punto de vista de la docencia en cursos universitarios de microelectrónica, basado en la experiencia de los autores tanto en el ámbito de la enseñanza de tal disciplina, como en el uso de este sistema para el diseño de ASIC´s complejos en diferentes plataformas.2009-10-02T14:30:46Z
Gadea, R.
og García de Quirós, J.
og Larrea, M.A.
The underwater archaeological and historical heritage of Gibraltar
http://e-spacio.uned.es/fez/view/bibliuned:grupinvestGAMA-Articulos-Jlario-0016
Gibraltar' s rich and varied heritage has been the subject of a great man y books, articles, documentaries and other media (Finlayson & Finlayson, 1999 & references therein). A large part of this heritage has doubtless stemmed from Gibraltar's unique location at the meeting point between the Atlantic Ocean and the Mediterranean Sea. The Rock and its hinterland therefore have had important connections with the sea from the earliest of times, and it is no surprise to find that a good deal of Gibraltar' s links are maritime. Ajoint team from the Gibraltar Museum, Oxford University MARE, and Museo de Historia Natural de Madrid are working together on a number of projects (assisted by local 2022-05-21T04:53:38Z
Finlayson, Clive
og Bound, Mensund
og Fa, Darren A.
og Lario, Javier
Inestabilidad termoconductiva en un flujo de Couette
http://e-spacio.uned.es/fez/view/bibliuned:master-Ciencias-FSC-Jsanz
Gravity waves and instability are ubiquitous phenomena of a major importance in atmosphere and oceans. They play a central role in the transport of momentum and energy balance at a wide range of scales in both space and time. The most common type of gravity waves is the internal gravity wave (IGW), which occur in the interior of a stable stratied fluid. As examples of instabilty we can mention baroclynic and barotropic instabilities, being both responsibles of cyclogenesis in mid-latitudes and tropics. The characteristic properties of IGWs are usually studied by using the linear Taylor- Goldstein equation, which is obtained by neglecting the thermal conductivity and the viscosity of the fluid. In this study we are going to incorporate these effects. In order to obtain some useful results, we must simplify the non-linear equations of motion, so some approximations are carried out. First we will apply the Boussinesq approximation, and second, we will linearize it by introducing small perturbations. In order to solve these equations we will use Galerkin method. We will analyze the conditions under which the instability arises, as well as its dependence with characteristic parameters like Prandtl number, Rayleigh number and the shear rate of the basic flow.2017-07-26T21:08:13Z
Sanz García, Javier
Ondas de gravedad internas en fluidos viscosos y termoconductivos
http://e-spacio.uned.es/fez/view/bibliuned:master-Ciencias-FSC-Pecarracedo
Internal gravity waves are waves that generate and propagate inside a fluid that is stable stratified. Waves are, in general, a very efficient way of energy transport other than mean fluid flow. Energy balance at several scales must take into account the contribution of internal gravity waves. In this work, classical theory of internal gravity waves is extended to a model that takes into account for the viscosity and thermal conductivity of fluids, properties that are shown to be the key to understand several observed new phenomena in atmosphere-like and ocean-like fluids as well. The model discussed is achieved under several approximations and using linear stability theory. Additionally, boundary conditions are presented and discussed. The resulting model has the important feature of having analytical solution. Dispersion relation of internal gravity waves in case of viscous and thermal conductive flow, as well as a comparison to classical non viscous flow dispersion relation are discussed and some results are presented.2016-01-11T22:34:08Z
Carracedo Garca, Pablo E.
Ondas inerciales de gravedad
http://e-spacio.uned.es/fez/view/bibliuned:master-Ciencias-FSC-Mpriego
Inertial gravity waves (IGWs) play a fundamental role in many atmospheric and oceanic processes and appear spontaneously during the development of the baroclinic instability, which has a dominant influence on large-scale meteorology. While IGWs have recently been detected in numerical simulations of the baroclinic annulus filled with water or high-Prandtl-number liquids, they have not been found in analogous simulations for low-Prandtl-number fluids, such as air. Hence, it has been suggested that the Prandtl number may affect the occurrence IGWs. In this work, the existence and characteristics of IGWs are studied in a simple model for a thermally stratified rotating fluid that incorporates the effects of viscosity and thermal conductivity. The model is derived in full detail, starting from the basic equations of compressible flow, passing through the Boussinesq approximation and the perturbation equations, and finally arriving at a characteristic cubic dimensionless equation that determines the growth rate of perturbations. The discussion of the solutions to the characteristic equation with respect to the Prandtl P, Rayleigh R, Taylor T, and wave numbers is greatly facilitated by a transformation that reduces the number of parameters from five to two. The analysis of the real part of the growth rate confirms the stability of the equilibrium state and reveals that perturbations are generally more damped the smaller the P. The analysis of the imaginary part corroborates the known results for the inertial limit, where rotation is dominant and oscillations exist for any T, and for the gravitational limit, where stratification prevails and oscillations only appear above a critical R. The main result is however that IGWs only exist in a specific infinite region of the two-dimensional parameter space. This theoretical finding supports the experimental and numerical evidence that, in addition to R and T, P plays a role in the appearance of IGWs. By condensing the dependencies with respect to the P, R, T, and wave numbers in just two parameters, the developed framework also eases the calculation, visualisation, and comparison of the damping and frequency characteristics of IGWs. For example, for two well-documented numerical studies of the baroclinic annulus with P = 0.7 and 16, the model predicts that, far away from the exclusion regions of IGWs, the oscillations for the lower P should be faster and more damped.2015-12-18T00:52:42Z
Priego Wood, Martín
The Mediterranean Sea and the Gulf of Cadiz as a natural laboratory for paleotsunami research: Recent advancements
http://e-spacio.uned.es/fez/view/bibliuned:grupinvestGAMA-Articulos-Jlario-0005
After the 2004 Indian Ocean (IOT) and the 2011 Tohoku-oki tsunamis, new research in tsunami-related fields was strongly stimulated worldwide and also in the Mediterranean. This research growth yields substantial advancements in tsunami knowledge. Among these advancements is the “Paleotsunami” research that has marked particular progress on the reconstruction of the tsunami history of a region. As an integration of the historical documentation available in the Mediterranean and the Gulf of Cadiz areas, geological and geoarchaeological records provide the insights to define the occurrence, characteristics, and impact of tsunamis of the past. Here, we present the recent advancements done for both the onshore and offshore realms. As for the onshore, we discuss case studies dealing with recent high-resolution works based on: a) direct push in situ sensing techniques, applied to identification and characterization of typical paleotsunami deposits features; b) combined XRF-X-CT approach, implemented for the identification of fine-scale sedimentary structures useful for the definition of the causative flow dynamics; c) the geoarchaeological “new field” contribution, with the development of specific diagnostic criteria in search for tsunami impact traces in archaeological strata; d) comparison of multiple dating methods and of different modeling codes for the definition of the potential source for the displacement of boulders of exceptional dimension, identified by 3D size calculation. As for the offshore advancements, we present case studies focusing on the recognition of tsunami deposits and their sedimentary traces in the geological record from the nearshore, thanks to diver-operated coring equipment, down to the continental slope, by means of vibracorer and long gravity core sampling in deeper areas. The examples provided show a multiproxy approach with a high potential of retrieving a complete record of paleotsunami traces at least during the Holocene. This is based on the combination of multidisciplinary approaches including X-ray imaging, high-resolution measurement of physical properties, Xray fluorescence data, grain-size analysis, micropaleontology, palynological content, isotopic and optically stimulated luminescence dating methods.2021-03-16T21:38:33Z
Martini, de P.M.
og Bruins, H.J.
og Feist, L.
og Goodman Tchernov, B.N.
og Hadler, H.
og Lario, Javier
og Mastronuzzi, G.
og Obrocki, L.
og Pantosti, D.
og Paris, R.
og Reicherter, K.
og Smedile, A.
og Vött, A.
Holocene aeolian dunes in the National and Natural Parks of Doñana (SW Iberia): Mapping, geomorphology, genesis and chronology
http://e-spacio.uned.es/fez/view/bibliuned:grupinvestGAMA-Articulos-Jlario-0024
The dune fields of the National and Natural Parks of Doñana are considered one of the most outstanding dune fields inWestern Europe. They are located at thewest margin of the Guadalquivir river estuary. The accumulation of aeolian sands partly blocks the connection between theample Guadalquivir River estuary and the Gulf of Cádiz in the Atlantic Ocean. The sand units forma large oval dome, the “Abalario Dome”which connectswith the large Doñana Spit Barwhere dune systems accumulated aswell, at least in part coevally with the spit growth. Themost frequent dune morphologies are parabolic or transverse. The degree of activity was classified as stable, semiactive and active. Most stable dunes concentrate on the Abalario Dome, whereas active dunes occur mainly on the Doñana spit bar. Relative chronology was established from the superposition of dune Systems and Subsystems deduced from photogeology coupledwith field surveys, orthophotos, and oblique and 3D images. Sampling and radiogenic dating (Optically Stimulated Luminescence-OSL) allowed to date eight dune Systems named as Systems I to VII plus an additional CS, which is a laterally equivalent to part of S IV, V and VI. The proposed ages are: System I, age 11.1 38 to 9.5 ky BP, perhaps extending to 8.5 ky BP. System II, 8.2 to 6.1 ky BP. System III, 5.9 to 2.6 ky BP. 39 System IV, 2.6 to 1.6 ky BP. System V, 1.6 to 1.3 ky BP. System VI, 1.2 to 0.7 ky BP. System VII, 0.7 to 40 0.15 ky BP. The age of the Complex System is 2.2 to 0.15 ky BP. Additionally, it was concluded that genesis of the somewhat-different Complex System(CS)was related to the increased accumulation space created by movements (sliding) along the Mazagón and Torre del Loro faults following major regional seismic activity.2022-06-03T05:46:32Z
Goy, José Luis
og Zazo, Caridad
og Dabrio, C. J.
og Martínez-Graña, Antonio Miguel
og Lario, Javier
og Borja, Francisco
og Bardají, T.
og C. Borja
og F. Díaz del Olmo