El test de autocalentamiento (TA) es una metodología sencilla para evaluar la estabilidad del compost que puede ser realizada en la propia instalación de compostaje y precisa poco utillaje. Sin embargo, su ejecución precisa experiencia para ajustar las características adecuadas al desarrollo de la prueba. El TA se ha utilizado ampliamente y su metodología está descrita en la norma UNE-EN 16087-2, dentro de las pruebas de determinación de actividad biológica aerobia. En el presente trabajo se ha estudiado el test de autocalentamiento considerando aspectos sobre la preparación de la muestra y se ha aplicado a muestras de compost de fracción orgánica de residuo municipal recogida en origen (FORM) y seleccionada mecánicamente en planta (FO-RSU) y de lodos de depuradora. Los resultados comparan la estabilidad para los materiales analizados, evalúan los efectos de la preparación de la muestra y analizan la idoneidad de la metodología para los materiales ensayados.
An algorithm is proposed that, starting from the probability generating function of a lefttruncation at k of a mixed Poisson distribution, recovers the first k + 1 probabilities of the untruncated distribution, without the need of eliciting what the mixing distribution is. The result establishes that irrespective of the value where the distribution is truncated, there still remains enough information in the tail so that the initial mixing distribution can be recovered. (C) 2014 Elsevier B.V. All rights reserved.
The distributions obtained by left-truncating at k a mixed Poisson distribution, kT-MP, and those obtained by mixing previously left-truncated Poisson distributions, M-kTP, are characterized by means of their probability generating function. The main consequence is that every kT-MP distribution is a M-kTP distribution, but not the other way around.
Despite the expanding market for 'calcots', the second-year resprouts of the 'Blanca Tardana de Lleida' onion landrace, this product is still obtained from traditional populations. During a program devoted to the obtainment of improved varieties for number of commercial 'calcots' per onion, several experiments were undertaken to evaluate the efficiency of the process and develop breeding tools. The heritabilities estimated for the trait were very low, ranging from 0.14 to 0.24, contrasting with the advances achieved in the selection process (more than 100% in all cases). This is related with the high phenotypic variability of the trait, indicating that the low heritability is due to a very strong environmental component. The results also showed the importance of starting the selection process from large bulbs to allow the maximum productive potential of each genotype to be expressed. Slicing these bulbs transversely and counting the gemmae enables us to know the number of 'calcots' the onion will produce because the coefficient of correlation between gemmae and 'calcots' is 0.80 (p <= 0.001). Unfortunately, the lack of significant correlations between the characteristics of the bulb and the number of commercial 'calcots' per onion makes it necessary to finalize the selection on the second-year 'calcot'-producing plant, but counting gemmae makes it possible to explore a large number of individual bulbs and simplifies the final phase of selection.
Maceda (1948) characterized the mixed Poisson distributions that are Poisson-stopped-sum distributions based on the mixing distribution. In an alternative characterization of the same set of distributions here the Poisson-stopped-sum distributions that are mixed Poisson distributions is proved to be the set of Poisson-stopped-sums of either a mixture of zero-truncated Poisson distributions or a zero-modification of it.
El Bakali, M. A.; Garcia-Figueres, F.; Monton, C.; Valero, J.; Lopez, M.; Carazo, N.; Ornat, C.; Sorribas, F. Congreso Lationoamericano de Fitopatología p. 335 Presentation's date: 2010-09-01 Presentation of work at congresses
Ten composting facilities (CF) treating source-sorted organic fraction of municipal solid waste (OF) were
sampled to study the relationship between the bulk density and the composting process (CP) development.
Hundred and fourteen samples from different stages of the CP were considered (organic fraction,
initial mixture, final decomposition, final maturation and compost), including the reject materials coming
from the densimetric table at postprocessing. Total organic matter (TOM), moisture content (MC), wet
bulk density and dry basis (BDd) were determined. Significant differences were detected for MC, TOM
and BDd between some stages of the CP. The BDd increased along the CP while TOM decreased. Correlation
studies showed a significant negative relationship between TOM and bulk density, especially BDd,
during the CP, as a result of the biological activity. Moreover, a clear relationship was also found between
TOM and BDd in samples related to reject materials. The results indicate that bulk density could be a simple
and useful tool to evaluate the CP, in addition to the others parameters commonly used. At the same
time, BDd could be an easy way to infer TOM lost within rejects.
Huerta, O.; Lopez, M.; Martinez, F.; Valero, J.; Condes, L.; Soliva, M. I Jornadas de la red española de compostaje: III Reunión de la REC p. 214-218 Presentation's date: 2008 Presentation of work at congresses
Talavera, M.; Torres, J.; Vela, M.; Macias, F.; Arias, D.; Valero, J.; Sorribas, F.; Ornat, C.; Verdejo-Lucas, S.; Cortada, L. Sociedad Española de Fitopatología. Congreso Presentation's date: 2008 Presentation of work at congresses
Soliva, M.; Bernat, C.; Gil, E.; Martinez, F.; Pujol, M.; Sabate, J.; Valero, J. International journal of sustainability in higher education Vol. 8, num. 2, p. 224-233 Date of publication: 2007-04 Journal article
Soliva, M.; Bernat, C.; Gil, E.; Martinez, F.; Pujol, M.; Sabate, J.; Valero, J. International journal of sustainability in higher education Vol. 8, num. 2, p. 224-233 DOI: 10.1108/14676370710726670 Date of publication: 2007 Journal article
Sorribas, F.; Ornat, C.; Verdejo, S.; Talavera, M.; Torres, J.; Cortada, L.; Valero, J. Sociedad Española de Fitopatología. Congreso p. 54 Presentation's date: 2006-09-19 Presentation of work at congresses
Pujola, M.; Almirall, A.R.; Casañas, F.; Romero Del Castillo, M.; Florez, A.; Valero, J.; Nuez, F.; Julia, M.; Sanchez, E. EUCARPIA General Congress . Genetic variation for plant breeding p. 419-422 Presentation's date: 2004-09-08 Presentation of work at congresses