Plantas americanas naturalizadas en el territorio de Doñana (so de la Península Ibérica)

El estudio del territorio de Doñana (SO de la Península Ibérica), uno de los más estrictamente protegidos de España, indica que se han naturalizado en este territorio 59 especies de plantas americanas. Varias de estas especies ya habían sido introducidas en la Península Ibérica en el siglo XVI, mientras que la mayoría fueron introducidas y se naturalizaron entre los siglos XVIII y XXI. Se dan detalles de diez de estos taxones, registrados en Doñana por primera vez en la última década. Se destaca el incremento gradual de especies americanas naturalizadas en las últimas tres décadas, de nueve en 1980 a la cifra actual, un proceso que desgraciadamente continúa su curso. Como principales factores responsables de este proceso se indican el incremento en la población permanente y temporal en la región, el desarrollo de centros turísticos con la consiguiente creación continua de nuevos jardines y la construcción de nuevas carreteras.American plant species naturalized in the territory of Doñana (SW Iberian Peninsula). The floristic study of the territory of Doñana (SW peninsular Spain), one of the most strictly protected on the Iberian Peninsula, indicates that 59 American plant species have become naturalized in this region. Of these, several species had already been introduced into the Iberian Peninsula in the XVI century, while most were introduced and became naturalized from the XVIII to the XXI century. Details are given of ten of these taxa, recorded for the first time in the territory of Doñana in the last decade. We highlight the gradual increase in American naturalized plant species herein in the last three decades, from nine recorded in 1980 to the current figure, a process which unfortunately is ongoing. An increase in permanent and temporary population in this region, the development of tourist resorts with the consequent establishment of new gardens, along with the new roads, are indicated as the main factors responsible for this process

On the use of high-frequency SCADA data for improved wind turbine performance monitoring

SCADA-based condition monitoring of wind turbines facilitates the move from costly corrective repairs towards more proactive maintenance strategies. In this work, we advocate the use of high-frequency SCADA data and quantile regression to build a cost effective performance monitoring tool. The benefits of the approach are demonstrated through the comparison between state-of-the-art deterministic power curve modelling techniques and the suggested probabilistic model. Detection capabilities are compared for low and high-frequency SCADA data, providing evidence for monitoring at higher resolutions. Operational data from healthy and faulty turbines are used to provide a practical example of usage with the proposed tool, effectively achieving the detection of an incipient gearbox malfunction at a time horizon of more than one month prior to the actual occurrence of the failure

Up-scale challenges on biopolymer production from waste streams by Purple Phototrophic Bacteria mixed cultures: A critical review

Financial support from the Regional Government of Madrid through the project S2018/EMT-4344 BIOTRES-CM is gratefully acknowledged. D. Puyol wishes to thank the Spanish Ministry of Economy for the Ramon y Cajal grant. J. FThe increasing volume of waste streams require new biological technologies that can address pollution concerns while offering sustainable products. Purple phototrophic bacteria (PPB) are very versatile organisms that present a unique metabolism that allows them to adapt to a variety of environments, including the most complex waste streams. Their successful adaptation to such demanding conditions is partly the result of internal polymers accumulation which can be stored for electron/energy balance or as carbon and nutrients reserves for deprivation periods. Polyhydroxyalkanoates, glycogen, sulphur and polyphosphate are examples of polymers produced by PPB that can be economically explored due to their applications in the plastic, energy and fertilizers sectors. Their large-scale production implies the outdoor operation of PPB systems which brings new challenges, identified in this review. An overview of the current PPB polymer producing technologies and prospects for their future development is also provided.publishersversionpublishe

Atomically resolved chemical ordering at the nm-thick TiO precipitate/matrix interface in V-4Ti-4Cr alloy

We have used advanced analytical electron microscopy to characterise the local structure and chemistry at the interface between nm-thick TiO precipitates and the V-based matrix in a V-4Ti-4Cr alloy. Our results reveal the presence of an intergrowth between the fcc TiO and bcc vanadium structures, with a repeat lattice distance that equals 2.5 times the vanadium lattice parameter along the c-axis. Our atomic resolution analysis of the interface will impact the mechanistic understanding of its interaction with interstitials and radiation-induced lattice defects, and consequently trigger the development of improved alloy structures with interfaces engineered for enhanced radiation tolerance

Metastable austenite driven work-hardening behaviour in a TRIP-assisted dual phase steel

The mechanically-induced transformation behaviour of the metastable austenite phase in a high-strength industrial TRIP-assisted Dual Phase steel was monitored in situ using high-energy synchrotron diffraction under uniaxial loading. This allowed direct quantification of the impact of the transformation of the metastable austenite phase (16 vol %), embedded in a ferrite-bainite-martensite matrix, on the work hardening behaviour of this steel. Our results show that the mechanically induced transformation of austenite does not begin until the onset of matrix yielding. We provide experimental evidence which demonstrates for the first time that the austenite transformation increases the work-hardening contribution, σw thereby supporting a driving force approach to transformation induced plasticity. The transformation work required leads to an increase in the macroscopic work-hardening rate after matrix yielding and continues to offset the decrease in the work-hardening rate in the ferrite and martensite phases up to the UTS. Further we show conclusively that martensite yielding does not occur until the completion of the mechanically induced transformation of austenite. Plastic deformation of martensite is immediately followed by local plastic instability leading to necking and ultimate failure of this material

Simulador de redes eléctricas

Se presenta un simulador de redes eléctricas para el entrenamiento de operadores de centros de control de las mismas. El simulador es el resultado de una primera fase de un proyecto de investigación de UNESA, e incorpora las funciones fundamentales para redes pequeñas. El simulador se ha implementado sobre un computador de 16 bits y dispone de dos consolas semigráficas para el instructor y operador desde donde se puede actuar sobre la red y seguir la evolución de la misma

An omnichannel approach to retailing: demystifying and identifying the factors influencing an omnichannel experience

The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.The purpose of this research is to identify the factors that influence an omnichannel experience. Omnichannel is an emerging approach to retailing that responds to the changing nature of how customers shop in alternation between online and offline shops, and the increasing use of digital devices (e.g. smartphones and tablets) retailers are focusing and establishing a seamless integrated approach to their services. Omnichannel is now a hot topic in retailing but there is a lack of empirical studies into the factors that influence an omnichannel experience. Using a mixed methods approach, we propose and empirically test a conceptual model that identifies four factors influencing an omnichannel experience: brand familiarity; customisation; perceived value, and technology readiness. We conceptualise omnichannel to include three key channels; in-store, online and mobile. 246 questionnaires were collected and analysed using PLS-SEM and 11 interviews with marketing/omnichannel professionals. Our results indicate that brand familiarity has a strong influence on omnichannel (in-store, online and mobile) while perceived value has a negative impact on mobile experience. Our results show that retailers need to consider multiple factors, such as brand familiarity customisation, perceived value and technology readiness as influencing factors of an omnichannel experience, and plan the use of multiple touchpoints simultaneously to enhance their overall customer’s experience. Although this study demonstrates the significant factors influencing an omnichannel experience, questions remain regarding the exact use of each touchpoint by customers and the extent of overlap between the touchpoints. Our research attempts to address the lack of academic research on what factors influence an omnichannel experience