Michael Christoforidis, Manuel de Falla and Visions of Spanish Music London/ New York, Routledge, 2018.

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Structure Theorem for Riemannian surfaces with arbitrary curvature

In this paper we prove that any Riemannian surface, with no restriction of curvature at all, can be decomposed into blocks belonging just to some of these types: generalized Y-pieces, generalized funnels and halfplanes.Comment: 15 pages, 1 latex file, 7 eps figure

THE LEAD TIME TRADE-OFF: THE CASE OF HEALTH STATES BETTER THAN DEATH

The Lead Time Trade-Off (L-TTO) is a variant of the TTO method that tries to overcome some of the problems of the most widely used method (Torrance, 1986) for health states worse than death (SWD). Theoretically, the new method reduces the problems that have been detected when researchers have elicited preferences for SWD. However, several questions remain to be clarified. One of them is the influence of this new method for states better than death (SBD). In this paper we try to shed some light on this issue using a split sample design (n=500). One subsample (n=188) was interviewed using L-TTO and the rest using the traditional TTO (T-TTO). Our results show that the L-TTO produces utilities that are consistently higher than the T-TTO for SBD. Furthermore, the higher the severity the higher the difference between both methods. Another finding is that the L-TTO seems to produce a lower number of SWD. This effect seems to be concentrated in the most severe health states. This implies a violation of additive separability, one of the cornerstones of the QALY model. Our data show that the L-TTO may be different from the T-TTO in more respects than those that were originally intended.Lead Time Trade-Off, QALYs, Discounting, Additive Independece

THE LEAD TIME TRADE-OFF: THE CASE OF HEALTH STATES BETTER THAN DEATH

The Lead Time Trade-Off (L-TTO) is a variant of the TTO method that tries to overcome some of the problems of the most widely used method (Torrance, 1986) for health states worse than death (SWD). Theoretically, the new method reduces the problems that have been detected when researchers have elicited preferences for SWD. However, several questions remain to be clarified. One of them is the influence of this new method for states better than death (SBD). In this paper we try to shed some light on this issue using a split sample design (n=500). One subsample (n=188) was interviewed using L-TTO and the rest using the traditional TTO (T-TTO). Our results show that the L-TTO produces utilities that are consistently higher than the T-TTO for SBD. Furthermore, the higher the severity the higher the difference between both methods. Another finding is that the L-TTO seems to produce a lower number of SWD. This effect seems to be concentrated in the most severe health states. This implies a violation of additive separability, one of the cornerstones of the QALY model. Our data show that the L-TTO may be different from the T-TTO in more respects than those that were originally intended.Lead Time Trade-Off, QALYs, Discounting, Additive Independece

Human capital and other factors of the total productivity in Spanish Regions

The productivity evolution results a main factors indicators in order to explain the uneven growth of the different economic spaces and their different levels of welfare in a long run. Just, the crucial importance of productivity for economic growth can be derived from its relation to other indicators of economic performance. Among other factors, these include accumulation of physical and human capital, technological progress, resources allocation and efficiency, and competitiveness. For this reason, in this paper we elaborate in the first place an indicator of Total Factor Productivity for the Spain regions from of point of view of the theoretical justifications of the different methodological proposals. In the second place, and using the available statistics, we explain the unequal behaviour of the Total Factor Productivity (TFP) between these regions from a point of view that variables like public capital (infrastructure), human capital (qualification), technological capital (research and development), productive specialization, the different grades of resource's uses, the exploitation of scale economies ..., may justify the regional divergence in productivity terms.

Modelling Noise and Imprecision in Individual Decisions

When individuals take part in decision experiments, their answers are typically subject to some degree of noise / error / imprecision. There are different ways of modelling this stochastic element in the data, and the interpretation of the data can be altered radically, depending on the assumptions made about the stochastic specification. This paper presents the results of an experiment which gathered data of a kind that has until now been in short supply. These data strongly suggest that the 'usual' (Fechnerian) assumptions about errors are inappropriate for individual decision experiments. Moreover, they provide striking evidence that core preferences display systematic departures from transitivity which cannot be attributed to any 'error' story.Error Imprecision Preferences Transitivity

Evaluation of different chemical agents as settling enhancers in an activated sludge of a WWTP.

Currently, the few studies carried out on the sedimentability of activated sludge from a WWTP, make it possible to continue to act on them using different chemical agents that can positively influence the solution of various problems caused by poor sedimentability. To do this, a pilot plant was built to simulate a phase of the WWTP, constituted by a tank of water supply decanted from the Tablada WWTP, a biological reactor, a decanter and a reservoir where we collected the treated water. To carry out the study, first, was started the plant  in which the floccules typical of an active sludge were formed gradually. A study of V30 and V60 was done on them to observe the capacity of sedimentability and to obtain an optimum. It was not possible to obtain the optimum sought, so that finally active sludge was used from the tanks of the Tablada WWTP. On this mud, progressive additions of different chemical agents such as talc, bentonite and TW 4650 VHM polymer were made at different concentrations, carrying out a subsequent study of the treated water obtained after the addition. The analysis made in the treated water were COD, Matches and Nitrogens, to verify that they were within the optimal parameters valid in a WWT

Productividad total de los factores en el sector agrario gallego, 1970-95. Analisis provincial.

En este trabajo calculamos indices de productividad total de los factores para el sector agrario gallego en su conjunto (agricultura y ganaderia). Para ello aplicamos el indice de Divisia en su aproximacion discreta (Törnqvist-Theil), con el objeto de llevar a cabo la agregacion del output y de los factores productivos. Para el calculo del output hemos recopilado cantidades y precios de 32 cultivos agricolas y 9 ganaderos con el fin de aproximarnos lo mas posible a la produccion final agraria total. En cuanto a los factores productivos hemos distinguido entre: trabajo, tierra, capital fisico, capital ganadero, energia y consumos intermedios. El periodo temporal que abarcamos comprende desde 1970 a 1995, y presentamos los resultados a nivel de las cuatro provincias gallegas y para el total de la Comunidad. Como resultado, obtenemos que la tasa media de crecimiento anual de la productividad total de los factores en el periodo considerado y para el conjunto de la region, se situa en 1.64%, consecuencia de que produccion disminuye (-0.14%) y los inputs lo hacen en mayor medida (-1.75%).