Híbridos nuevos en el género "Teucrium l." (laniaceae)

Se describen cuatro nuevas nothoespecies del género Teucrium L. (Sect. Polium) para el sureste de España: T. x rigualii (T. libanitis x T. carolipaui), T. x riosii (T. capitatum subsp. gracillimumxT. carolipaui), T.xriverae (T. capitatum subsp. gracillimumxT. dunense), yT. x robledoi (T. capitatum subsp. gracillimumx T. homotrichum). Asimismo se aportan datos sobre la posición bioclimática, biogeográfica y fitosociológica de cada uno de ellos

Notas fitosociológicas sobre el sudeste ibérico

Se da cuenta de algunos sintaxones nuevos del SE de Espana y más concretamente de la provincia de Alicante (Teucrio-Ulicetum dianii nova, subasociación típica, erinacetosum y ononidetosum; Querco-Pistacietum lentisci (Br.-81., 1935) A. et O. Bons 1950 viburnosum tini var. nova). Así mismo se proponen una combinación nueva (Daphno-Festucetum capillifoliae O.Bolós et Rigual 1967 stipetosum tenacissimae (Alcaraz et Rivas-Martínez in Alcaraz 1984) comb. nova y el nombre corregido de otra (Jasonio-Teucrietum thymifolii (Rigual, Esteve et Rivas Goday 1962) corr.As a result of phytosociological investigation on the "Sierra del Maigmó" (Alicante, Spain) we described a new association (Teucrio�Ulicetum dianii) with some subassociations. We make a new combination and, according to the Code of Phytosociological Nomenclature, we propose the correction of Jasonio�Teucrietum thymifolii

Calculation of threshold Olsen P values for fertilizer response from soil properties

Phosphorus (P), a non-renewable resource, needs to be used more efficiently in agriculture. This requires using soil P tests. However, the P test threshold values for fertilizer response depend on many soil properties, some of which may be useful to estimate these threshold values, others not. Therefore, we searched here which soil properties are useful to estimate P threshold values. We calculated the threshold values for Olsen P and 0.01 M CaCl2 extractable P of 18 representative agricultural soils of the Mediterranean region of Spain. For that, we performed a P starvation experiment in which wheat and sunflower were alternatively pot-cropped. Results show that Olsen P threshold values are negatively correlated to P buffer capacity (r of −0.74, P lower than 0.001), clay content (−0.82, 0.001), pH (−0.76, 0.001), and Fe oxide content (−0.55, 0.05). Multiple regression models involving clay, pH or soil organic C, and phosphatase activity or organic hydrolysable P accounted for as much as 87 % of the variance in calculated Olsen P threshold values. In particular, there is a major effect of organic P on Olsen P threshold values. Single models based on routinely measured soil properties such as clay content and pH made accurate predictions of Olsen P threshold values with r 2 of 0.81 and P lower than 0.001

Using Markov-Switching models in Italian, British, U.S. and Mexican equity portfolios: a performance test

In this paper we test the use of Markov Switching models in equity trading strategies, following Brooks and Persand (2001), Kritzman et al. (2012) and Hauptmann et al. (2014), who suggest their use as warning systems of bad performing periods. We extend their reviews by testing again (with the impact of trading fees) the U.S. and U.K. markets and by extending our tests to the Italian and Mexican case. The rationale behind our Markov-Switching strategy is to invest in equity index tracking ETFs in low volatility or ”good performing” periods and in the local risk-free asset in high-volatility or ”bad performing” ones. Our results show that in a weekly simulation from January 4, 2001 to July 30, 2017 with a 0.35% trading fee plus taxes, our system is useful to create alpha in all the simulated markets even if the Italian case showed several deep distress moments due to a financial or political crisis

Acueducto de Segovia: Comportamiento mecánico

Informe destinado a aportar luz sobre algunos aspectos de la mecánica del Acueducto de Segovia: tensiones y deformaciones derivadas de las variaciones térmicas diarias y estacionales y alteraciones de los campos de tensión derivados de las degradaciones típicas de las juntas. Se aportan entre otros resultados explicaciones a la frecuente existencia de fisuras en prolongación de las juntas, asi como evidencia sobre fenómenos mecánicos que coadyuvan en el proceso de desescamación de los sillares degradados

Welding data adquisition based on FPGA

This paper presents the use of FPGA in data acquisition and digital preprocessing of the electric current signal of resistance welding stations. This work demonstrates that electric current has enough information to classify this kind of welds in mass production industries. Parameters extracted with the FPGA excite a classifier that accept o reject the welding junction. This system has been developed using a neural classifier and installed in a welding station of General Motors in Cádiz (Spain). Results confirm the validity of this novel approach