Techno-economic performance evaluation of solar tower plants with integrated multilayered PCM thermocline thermal energy storage: a comparative study to conventional two-tank storage systems

Copyright 2016 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.Solar Tower Power Plants with thermal energy storage are a promising technology for dispatchable renewable energy in the near future. Storage integration makes possible to shift the electricity production to more profitable peak hours. Usually two tanks are used to store cold and hot fluids, but this means both higher investment costs and difficulties during the operation of the variable volume tanks. Instead, another solution can be a single tank thermocline storage in a multi-layered configuration. In such tank both latent and sensible fillers are employed to decrease the related cost up to 30% and maintain high efficiencies. This paper analyses a multi-layered solid PCM storage tank concept for solar tower applications, and describes a comprehensive methodology to determine under which market structures such devices can outperform the more conventional two tank storage systems. A detail model of the tank has been developed and introduced in an existing techno-economic tool developed by the authors (DYESOPT). The results show that under current cost estimates and technical limitations the multi-layered solid PCM storage concept is a better solution when peaking operating strategies are desired, as it is the case for the two-tier South African tariff scheme.Peer ReviewedPostprint (published version

Enantioselective alkylation of β-keto esters promoted by dimeric Cinchona-derived ammonium salts as recoverable organocatalysts

Dimeric anthracenyldimethyl-derived Cinchona ammonium salts are used as chiral organocatalysts in 5 mol% for the phase-transfer enantioselective alkylation reaction of 2-alkoxycarbonyl-1-indanones with activated bromides. The corresponding adducts bearing a new all-carbon quaternary center are obtained usually in high yield and with moderate and opposite enantioselectivity (up to 55%) when using ammonium salts derived from quinidine and its pseudoenantiomer quinine as organocatalysts. These catalysts can be almost quantitatively recovered by precipitation in ether and reused.Financial support from the Spanish Ministerio de Ciencia e Innovación (projects CTQ2007-62771/BQU and Consolider Ingenio 2010, CSD2007-00006), the Generalitat Valenciana (Prometeo/2009/039), FEDER and the University of Alicante

L'evolució demogràfica de la Costera de Ranes segons la contribució de menjadors (1610-1681)

it is considered that the expulsion of the Moors of València caused a demographic impact, as well as a structural change in the occupation of the Valencian region, which was one the reasons for the later valencian development. This paper analyzes the demographic evolution Post-Moorish of a fragment of the Costera de Ranes, term of Xàtiva, from registers kept on the collection of the municipal contribution of Menjadors. The right of menjadors was a direct tax that residents of the particular contribution of Xàtiva had to pay for being neighbors of Xàtiva 'and enjoy all the exemptions, franchises and immunities enjoyed by the neighbords' of Xàtiva. Therefore, it helps us to know how many people lived in each place of the particular contribution of the city

Retos y nuevas perspectivas en la revegetación de sistemas forestales

Entre los días 21 y 23 de noviembre de 2007 tuvo lugar la I Reunión del Grupo de Trabajo de Repoblaciones Forestales de la Sociedad Española de Ciencias Forestales (SECF) y el grupo de trabajo de Restauración Ecológica de la Asociación Española de Ecología Terrestre, y IV Reunión del Grupo de Trabajo de Repoblaciones Forestales de la SECF en las instalaciones del Rectorado de la Universidad de Alcalá. A la reunión asistieron 74 participantes, y se presentaron un total de 39 comunicaciones orales, 18 paneles y 8 ponencias invitadas. Además, se presentó el libro “Calidad de Planta Forestal para la Restauración en Ambientes Mediterráneos” y se organizaron dos mesas redondas, una sobre “Necesidades reales de investigación en calidad de planta y cultivo de planta forestal en vivero” (Tabla 1) y otra sobre “Necesidades reales de la investigación en reforestación” (Tabla 2, 3). Una densa agenda para alcanzar los principales objetivos de la reunión, la presentación de investigación de calidad en el ámbito de la revegetación de sistemas forestales, y el intercambio de experiencias e inquietudes entre los diversos colectivos implicados en la misma. Pero ¿qué imagen podemos extraer del estado actual de nuestros conocimientos en esta área a partir de las comunicaciones presentadas

A hands-on genetics teaching approach at university level.

Teaching general Genetics is a cornerstone of a large number of university degrees. Being a scientific topic, laboratory classes are an essential element in student-centered learning. Here, we present our experience in implementing new material for teaching hands-on genetics, a subject of interest for other academic professionals in the field of Genetics. Our students carry out a genetic analysis of the su (sense ulls) mutation of Drosophila melanogaster, which produces a drastic eye reduction. The complete strain description can be found in Mestres et al. (2016a). The aim of the course is to give students the appropriate genetics tools to answer the three following questions: 1) Is the su mutation dominant or recessive? 2) In which chromosome is su located? 3) Can we identify in which gene the su mutation is

Descritpion of a double mutant strain of Drosophila melanogaster useful for genetic laboratory courses.

Many years ago, individuals showing drastically reduced eyes arose in our laboratory e (ebony) strain (Bridges and Morgan, 1923). We selected those flies presenting both traits and constituted a new double mutant strain e su (e, ebony; su, 'sense ulls', eyes drastically reduced). Both mutations were linked and located in the chromosome III. We used this strain in linkage analyses with our undergraduate students. [...

La resistencia globular sus bases, aplicaciones clinicas en general, su valor diagnóstico en el cáncer

El verso de las h. en blanco. Tesis de doctorado leída en la Universidad Central el 2 de diciembre de 1909.Universidad Central (Madrid)TRUEProQuestpu

Método lógico de lectura elemental

Datos tomados de cubierta que ejerce de portada.Copia digital. España : Ministerio de Cultura. Subdirección General de Coordinación Bibliotecaria, d2024Rústica.Registro de la Propiedad Intelectual: Ley de 1847: 19480; n. de solicitud de ingreso: "6024"; fecha y datos de ingreso: "31 Dic. 77", "Regº fº 278 lib. 29"; firma del depositante: "Rafael Segarra Rocamora

A Meta-analysis of Innovation and Organizational Size

Findings regarding the direction and intensity of the relation between size and innovation in the literature are contradictory. In the journal Organization Studies in 1992, Damanpour proposed a meta-analytical study in an attempt to clarify the diversity of existing conclusions. The present article is a replica and an extension of that study using the same methodology. Our aim is to (1) bring the pool of accumulated knowledge up to date, examining the time span 1970–2001, and (2) review in greater depth the effects of alternative ways of measuring organizational size. The sample used was made up of 87 correlations drawn from 53 empirical studies published in the most important journals on business administration. The analysis enabled us to confirm the existence of a significant and positive correlation between size and innovation. It also provided evidence showing that the contradictory results obtained in previous studies are due to divergences in the methods used to operationalize one, or more, of the variables to be analysed. The main contribution made by our work stems from the fact that the empirical analysis performs a more thorough breakdown of the definitions of the size variable used in the literature. This may well be a first step toward justifying the differences in the results of the primary studies that analyse the relation under examination

Brief cognitive assessment instruments in schizophrenia and bipolar patients, and healthy control subjects: A comparison study between the Brief Cognitive Assessment Tool for Schizophrenia (B-CATS) and the Screen for Cognitive Impairment in Psychiatry (SCIP)

Cognitive impairment in schizophrenia and psychosis is ubiquitous and acknowledged as a core feature of clinical expression, pathophysiology, and prediction of functioning. However, assessment of cognitive functioning is excessively time-consuming in routine practice, and brief cognitive instruments specific to psychosis would be of value. Two screening tools have recently been created to address this issue, i.e., the Brief Cognitive Assessment Tool for Schizophrenia (B-CATS) and the Screen for Cognitive Impairment in Psychiatry (SCIP). The aim of this research was to examine the comparative validity of these two brief instruments in relation to a global cognitive score. 161 patients with psychosis (96 patients diagnosed with schizophrenia and 65 patients diagnosed with bipolar disorder) and 76 healthy control subjects were tested with both instruments to examine their concurrent validity relative to a more comprehensive neuropsychological assessment battery. Scores from the B-CATS and the SCIP were highly correlated in the three diagnostic groups, and both scales showed good to excellent concurrent validity relative to a Global Cognitive Composite Score (GCCS) derived from the more comprehensive examination. The SCIP-S showed better predictive value of global cognitive impairment than the B-CATS. Partial and semi-partial correlations showed slightly higher percentages of both shared and unique variance between the SCIP-S and the GCCS than between the B-CATS and the GCCS. Brief instruments for assessing cognition in schizophrenia and bipolar disorders, such as the SCIP-S and B-CATS, seem to be reliable and promising tools for use in routine clinical practice