4,990 research outputs found
Biología y cultivo experimental de la dorada (Sparus aurata L.) y del róbalo (Dicentrarchus labrax L.) de estero y estudio de las salinas de Cádiz en relación con su aprovechamiento en cultivos marinos
No full textMemoria de tesis doctoral presentada por Alberto Manuel Arias Garcia para optar al grado de Doctor por la Universidad de Sevilla, realizada bajo la dirección del Dr. Julio Rodríguez Roda del Instituto de Investigaciones Pesqueras (IIP-CSIC).-- 295 pagesLas salinas marítimas tienen en España gran importancia, pues su capacidad productiva es elevada, siendo la sal que en ellas se obtiene muy apreciada en los mercados extranjeros donde se emplea en la industria de salazones de pescado.
En el Levante español las salinas de Torrevieja y La Mata son las que alcanzan hoy día un mayor volúmen de producción debido, principalmente, a las favorables condiciones climatológicas de la zona que permiten tenerlas en funcionamiento unos diez meses al año.
En las salinas de Cádiz la época de extracción se reduce casi exclusivamene a los tres meses de verano, a lo que se une un proceso de fabricación anticuado y sin grandes posibilidades de mejora por la naturaleza de los terrenos en que están enclavadas las explotaciones salineras. [...] Morone punctata, Solea solea, Anguilla anguilla, lisas, Salicornia fruticosa, Suaeda maritima, Limoniastrum monopelatum, Chaetomorpha ?, Ulva lactua, Zostea marina, Cardium glaucum, Tapes sp., Larus genei, Sterna albifrons, Egretta garsetta, Mugil chelo, M. ramada, M. cephalus, Dicentrarchus punctatus, M. auratus, M. saliens, M. provensalis, Solea senegalensis, C. glaucum, Rissoa sp., Sepia officinalis, Palaemonetes varians, Carcinus maenas, Uca tangeri, Artemia salina, Atherina presbyter, Pomatochistus minutus, Gobius paganellus, S. typhle, S. acus, N. ophidion. Diplodus sargus. Diplodus vulgaris. Diplodus annularis, Blennius sp., Batrachoides didactylus, Sardina pilchardus, Engraulis encrasicholus. Sardinella aurita, Belone belone, Puntazzo puntazzo, Spondyliosoma cantharus, Mullus surmuletus, Trigla hirundo, Balistes carolinensis, Symphodus quinquemaculatus, Pomatomus saltator, S. maximus, Johnius regius, Caesiomorus glaucus, Dentex filosus, Penaeus kerathurus, Chrysophrys aurata, Morone labrax, Abra alba, Turritella communis, Nassa reticulata, Ulva lactuca, Zostera marina, Paracentropristis scriba, P. cabrilla, P. hapatus, Boops salpa, Boops boops, Dentex dentex, Pagellus erythinus, Anilocra mediterranea [...]Peer reviewe
Costs and benefits of debt and debt service reduction
No full textThe author evaluates the costs and benefits of debt and debt service reduction (DDSR) from the point of view of five countries that have concluded Brady deals: Costa Rica, Mexico, the Philippines, Uruguay, and Venezuela. He concludes that, contrary to widely held views, commercial banks have probably benefited from the operations. Commercial bank participation in DDSR is voluntary, so direct financial savings to the country are probably negative at present values. The benefit from DDSR is not that debt is bought at"bargain prices"at the expense of commercial banks. It appears difficult to justify a DDSR operation on purely financial grounds. A more realistic way to look at a DDSR operation is to view it as a"project"that involves a certain financial cost. The return on such a project is how the DDSR operation improves the macroeconomy, or contributes to development. The main purpose of DDSR is to establish a more efficient arrangement between debtor countries and commercial banks, leading to improved conditions for development. A DDSR operation that does not help development is costly and should not be undertaken. The impact of DDSR on development is usually measured by the increase in the growth rate of GDP, but it is too soon to measure that for these five countries. A suitable alternative is to look at the change in investment patterns. A strong policy framework is needed if debt and debt service reduction are to significantly improve development. In Mexico and, to a lesser extent, Venezuela, improved and sustained strong adjustment policies have generated the greatest development benefits. Gains have been less in smaller countries where policies were not as supportive. The author concludes that for a country to benefit from DDSR, it needs significant indirect benefits (such as increased domestic and foreign savings). Direct benefits are likely to be negative because of the commercial banks'financial gains and because DDSR operations are frontloaded. DDSR operations cannot be justified solely by direct benefits and savings in cash flow.Strategic Debt Management,Banks&Banking Reform,Economic Theory&Research,Environmental Economics&Policies,Financial Intermediation
Cultivos marinos en la provincia de Cádiz : Estado actual, y perspectivas de la explotación piscícola en las salinas gaditanas
No full text11 pages, 4 figures, 1 tablePor su interés, así como por su calidad, damos a conocer un estudio sobre el estado y perspectivas de explotación piscícola en las salinas gaditanas. El trabajo de Alberto Arias García ha sido publicado por el Servicio de Estudios del Banco Urquijo de Sevilla. [...] Salicornia fructicosa, Limoniastrum monopetalum, Sparus aurata, Dicentrarchus labrax, Dicentrarchus punctatus, Solea senegalensis, Anguilla anguilla, Mugil auratus, Mugil cephalus, Mugil provensalis, Mugil ramada, Mugil saliens, Nereis sp., Cerastoderma glaucum, Rissoa sp., Sepia officinalis, Palaemonidae, Palaemonetes varians, Carcinus maenas, Uca tangeri, Artemia salina, Atherina presbyter, Gobius paganellus, Dicentrarchus punctatus, Sardina pilchardus, S. typhle, S. acus, N. ophidion, Diplodus sargus, Diplodus vulgaris, Diplodus annularis, Pomatochistus minutus, Bennius sp., Batrachoides didactylus, Engraulis encrasicholus, Sardinella aurita, Belone belone, Puntazzo puntazzo, Spondyliosoma cantharus, Mullus surmuletus, Trygla hirundo, Balistes carolinensis, Symphodus quiquemaculatus, Pomatomus saltator, S. maximus, Johnius regius, Caesiomorus glaucus, Dentex filosus, Cardium glaucum [...]Peer reviewe
Complete multicomponent versus mixture-averaged calculations of a laminar H2/N2 diffusion flame including heat transfer at the burner and Soret effects
No full textThe implementation of full multicomponent treatment of diffusion fluxes in the CFD solver for laminar reacting flows with detailed kinetic mechanisms laminarSMOKE++ is presented. The optimised 1+M multicomponent formulation (including Fick diffusion and Soret effects) derived from the Kinetic Theory of Gases, with a similar computational cost as mixture-averaged, is considered. Results are presented for a H2/N2 laminar coflow diffusion flame, where either heat transfer at the burner wall is included, either the wall is considered adiabatic. We observe that full multicomponent and mixture-averaged results are very similar when Soret effects are neglected. However, differences are observed when including thermodiffusion. In particular with heat transfer at the wall, large differences are observed whether thermodiffusion is neglected or included. In this case, the mixture-averaged approximation used for the thermal diffusion coefficients leads to significant differences in the results compared to the full multicomponent 1+M formulation
Diseño de una Arquitectura de Comunicación Ethernet Usando Micro-Controladores de 32 Bits para el Control Distribuido de una Plataforma Robótica Móvil
No full textLa robótica móvil es un campo de investigación de gran dinámica de las últimas décadas, el desarrollo de robots móviles de mayor complejidad, ha generado la necesidad de distribuir la carga de procesamiento y control del robot en módulos con tareas específicas. Por consiguiente, es necesaria una arquitectura de comunicación flexible, que permita compartir información entre dichos módulos. En este trabajo se describe el desarrollo del control distribuido de una plataforma robótica móvil, que consta de: un módulo de orientación AHRS (Sistema de Referencia de Actitud y Rumbo), uno de visualización y uno para el control de motores y odometría. Para la comunicación entre estos módulos se usa una arquitectura de comunicaciones por capas de abstracción. Se utiliza un modelo cliente-servidor con Sockets UDP/IP en la capa de transporte y Ethernet como protocolo de la capa física y de acceso al medio. Como Dispositivo de control en cada módulo, se cuenta con una plataforma de prototipado rápido MBED, que utiliza microcontroladores LPC1768 de 32 Bits, de la familia Cortex-M de ARM y un sistema operativo en tiempo real (RTOS) para la administración de las tareas. La finalidad de esta plataforma es didáctica para la puesta en práctica de los conceptos básicos de robótica, control y comunicacionesAbstract : Mobile robotics is a research field of great dynamic in recent decades, the increasing complexity of mobile robots, has created the need to distribute the robot control and processing load in modules with specific tasks, therefore, is required a flexible communication architecture for sharing information between the modules. In this work is described the development of distributed control for a mobile robotic platform, comprised of: an AHRS orientation module (Attitude and Heading Reference System), one for displaying information and one for motor control and odometry. For the comunication between this modules is used an abtraction layers comunication architecture. Client-Server model is used, with UDP/IP Sockets in the transport layer and Ethernet as the physical layer and medium access protocol. As control device into each module, accounts a MBED platform for fast prototyping, that uses the LPC1768 32 Bits microcontroller from the ARM Cortex-M family and a real time operating system (RTOS) for task administration. This platform has a didactic goal, for the training in the basic concepts of robotics, the control and communicationsMaestrí
Toward predicting tensile strength of pharmaceutical tablets by ultrasound measurement in continuous manufacturing
No full textAn ultrasound measurement system was employed as a non-destructive method to evaluate its reliability in predicting the tensile strength of tablets and investigate the benefits of incorporating it in a continuous line, manufacturing solid dosage forms. Tablets containing lactose, acetaminophen, and magnesium stearate were manufactured continuously and in batches. The effect of two processing parameters, compaction force and level of shear strain were examined. Young's modulus and tensile strength of tablets were obtained by ultrasound and diametrical mechanical testing, respectively. It was found that as the blend was exposed to increasing levels of shear strain, the speed of sound in the tablets decreased and the tablets became both softer and mechanically weaker. Moreover, the results indicate that two separate tablet material properties (e.g., relative density and Young's modulus) are necessary in order to predict tensile strength. A strategy for hardness prediction is proposed that uses the existing models for Young's modulus and tensile strength of porous materials. Ultrasound testing was found to be very sensitive in differentiating tablets with similar formulation but produced under different processing conditions (e.g., different level of shear strain), thus, providing a fast, and non-destructive method for hardness prediction that could be incorporated to a continuous manufacturing process.Peer reviewe
On partial isometries in C*-algebras
No full textWe study similarity to partial isometries in C*-algebras as well as their relationship with generalized inverses. Most of the results extend some recent results regarding partial isometries on Hilbert spaces. Moreover, we describe partial isometries by means of interpolation polynomials.Fil: Arias, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Saavedra 15. Instituto Argentino de Matemática Alberto Calderón; ArgentinaFil: Mbekhta, Mostafa. Universite Lille; Franci
Programa computacional en 3-D para el conjunto de yacimiento geotérmico y cámara magmática :\ua0aplicación en el campo geotérmico de Los Humeros, Puebla /
No full text\ua0tesis que para optar por el grado de: Doctor en Ingeniería Energía-Geotermia presenta: M. I. Efraín Gómez Arias ; tutores: Dr. Surendra P. Verma Jaiswal, Dr. Jorge A. Andaverde Arredondo226 páginas :\ua0ilustraciones, diagramasDoctorado en Energía\ua0UNAM, Centro de Investigación en Energía,\ua0201
Tercer descarte. Querido Alberto:
No full textThis third chapter of the book "Descartes bibliográficos y de bibliofilia" by Prof. Pedro M. Cátedra is dedicated to Prof. Alberto Blecua. He studies a peculiar little Book of Hours of Seventeenth century Spain, written by a nine-year-old child, in an excellent calligraphy, which the principal poets of Madrid (Juan Ruiz de Alarcón, Pedro Calderón de la Bara, Lope de Vega, Luis Vélez de Guevara or Jerónimo de Villaizán) celebrate with some poetical compositions, 'décimas' or sonnets. It is suggested that the author could be one of the numerous bastards of Philip IV. It is studied also in the context of the changes of Spanish calligraphy in Seventeenth Century.
Este tercer capítulo del libro Descartes bibliográficos y de bibliofilia del profesor Pedro M. Cátedra está dedicado al profesor Alberto Blecua. Se estudia un peculiar libro de horas del siglo XVII, escrito por un niño de nueve años, en una caligrafía excelente, que celebran los principales poetas de Madrid –Juan Ruiz de Alarcón, Pedro Calderón de la Barca, Lope de Vega, Luis Vélez de Guevara y Jerónimo de Villaizán– con décimas o sonetos. Se sugiere que el autor pueda ser uno de los numerosos hijos bastardos de Felipe IV. Se estudia también en el contexto de los grandes cambios sobre la caligrafía en la España de principios del siglo XVII
Programming files to set up open-source controllers to conduct multiple stressor research in marine organisms [Software]
No full textThis repository contains the scripts developed for the study titled "An Aquaria Setup for Long-term, Multiple-stressor Research in Marine Organisms". For a comprehensive explanation of the code, please refer to Appendix A in the article. Reference: An aquaria setup for long-term, multiple-stressor research in marine organisms. C. Gutiérrez-Zárate, A. Veiga, A. Gori, F. Gerpe, L. Domínguez, A. Rodríguez, N. Arias, M. Álvarez, R. Acerbi, L. Vázquez, J. Movilla, M. M. Varela, R. Alba-Salgueiro, J. Valencia-Vila, & C. Orejas (In Press). Methods in Ecology and Evolution.European Commission
iAtlantic – Integrated Assessment of Atlantic Marine Ecosystems in Space and Time 818123Peer reviewe
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