Neural networks and spectra feature selection for retrival of hot gases temperature profiles

Proceeding of: International Conference on Computational Intelligence for Modelling, Control and Automation, 2005 and International Conference on Intelligent Agents, Web Technologies and Internet Commerce, Vienna, Austria 28-30 Nov. 2005Neural networks appear to be a promising tool to solve the so-called inverse problems focused to obtain a retrieval of certain physical properties related to the radiative transference of energy. In this paper the capability of neural networks to retrieve the temperature profile in a combustion environment is proposed. Temperature profile retrieval will be obtained from the measurement of the spectral distribution of energy radiated by the hot gases (combustion products) at wavelengths corresponding to the infrared region. High spectral resolution is usually needed to gain a certain accuracy in the retrieval process. However, this great amount of information makes mandatory a reduction of the dimensionality of the problem. In this sense a careful selection of wavelengths in the spectrum must be performed. With this purpose principal component analysis technique is used to automatically determine those wavelengths in the spectrum that carry relevant information on temperature distribution. A multilayer perceptron will be trained with the different energies associated to the selected wavelengths. The results presented show that multilayer perceptron combined with principal component analysis is a suitable alternative in this field.Publicad

El fracaso del krauso-institucionismo en Mallorca

Abstract not availabl

On the regular-geometric-figure solution to the N-body problem

The regular-geometric-figure solution to the $N$-body problem is presented in a very simple way. The Newtonian formalism is used without resorting to a more involved rotating coordinate system. Those configurations occur for other kinds of interactions beyond the gravitational ones for some special values of the parameters of the forces. For the harmonic oscillator, in particular, it is shown that the $N$-body problem is reduced to $N$ one-body problems.Comment: To appear in Eur. J. Phys. (5 pages

Exploring a rheonomic system

A simple and illustrative rheonomic system is explored in the Lagrangian formalism. The difference between Jacobi's integral and energy is highlighted. A sharp contrast with remarks found in the literature is pointed out. The non-conservative system possess a Lagrangian not explicitly dependent on time and consequently there is a Jacobi's integral. The Lagrange undetermined multiplier method is used as a complement to obtain a few interesting conclusion

Almaceneras. Gender and work in fruit processing plants in the Region of Murcia

La creciente importancia de las cadenas globales en la producción agrícola para fresco ha convertido los almacenes de manipulado de frutas y hortalizas en espacios centrales para las estrategias de acumulación de la agroindustria. Las innovaciones tecnológicas y organizativas asociadas a esta nueva centralidad se producen, sin embargo, en espacios de trabajo fuertemente segmentados y desvalorizados. Espacios que han tendido a movilizar fuerza de trabajo vulnerable, como aquella conformada por mujeres, generalmente en estrecha relación con la posición subordinada que éstas ocupan en las comunidades locales y los hogares en que viven. La feminización del empleo en los almacenes ha contribuido a conformarlo como una actividad estable pero discontinua, central pero precaria, postfordista pero minusvalorada socialmente. En la vida de las almaceneras, estas lógicas introducen una específica itinerancia entre el espacio productivo y reproductivo, una temporalidad cíclica y discontinua, que se traduce en un cultura y una identidad laboral particulares. El objetivo de este artículo es indagar en estas cuestiones a partir del estudio de la fruticultura de exportación de la Vega Alta del Segura, en la Región de Murcia. Para ello nos centraremos, de un lado, en el proceso de feminización del empleo en los almacenes de manipulado y, de otro, en las culturas e identidades laborales de las mujeres que trabajan en estos almacenes.Packaging warehouses have become central points for accumulation strategies of agribusiness, due to the growing importance of global chains in fruits and vegetables production for fresh. Technological and organizational innovations associated with this process take place, however, in segmented and devalued workspaces. Packing warehouses have tended to use vulnerable work force, mainly women, in close relationship with the subordinate role they occupy in their households and communities. Because of the feminization, work in the packing warehouses is an activity stable but discontinuous, central but precarious, post-fordist but socially undervalued. In the life of women working in the packing stores, her job involves into a roaming between productive and reproductive space, a cyclical and discontinuous temporality, which brings about a culture and a particular work identity. In this paper, we analyze these issues from a case study: fruit growing export of Vega Alta del Segura, in the region of Murcia. To do this, we will focus on in the process of feminization of work in packing warehouses and in cultures and work identities of women in these workplaces

Four Years of Realtime GRB Followup by BOOTES-1B (2005-2008)

Four years of BOOTES-1B GRB follow-up history are summarised for the first time in the form of a table. The successfully followed events are described case by case. Further, the data are used to show the GRB trigger rate in Spain on a per-year basis, resulting in an estimate of 18 triggers and about 51 h of telescope time per year for real time triggers. These numbers grow to about 22 triggers and 77 h per year if we include also the GRBs observable within 2 hours after the trigger.Comment: 16 pages, Accepted into Proceedings of AstroRob Malaga 200

Relativistic confinement of neutral fermions with a trigonometric tangent potential

The problem of neutral fermions subject to a pseudoscalar potential is investigated. Apart from the solutions for $E=\pm mc^{2}$, the problem is mapped into the Sturm-Liouville equation. The case of a singular trigonometric tangent potential ($\sim \mathrm{tan} \gamma x$) is exactly solved and the complete set of solutions is discussed in some detail. It is revealed that this intrinsically relativistic and true confining potential is able to localize fermions into a region of space arbitrarily small without the menace of particle-antiparticle production.Comment: 12 page