Parameter characterization of HTPEMFC using numerical simulation and genetic algorithms

This paper develops a novel approach to the parameterisation of high temperature exchange membrane fuel cells (HTPEMFC) with limited and non-invasive measurements. The proposed method allows an effective identification of electrochemical parameters for three-dimensional fuel cell models by combining computational simulation tools and genetic algorithms. To avoid each evaluation undertaken by the optimisation method involving a complete computational simulation of the 3D model, a strategy has been designed that, thanks to an iterative process, makes it possible to decouple the fluid dynamic resolution from the electrochemistry one. Two electrochemical models have been incorporated into these tools to describe the behaviour of the catalyst layer, Butler-Volmer and spherical aggregate. For each one, a case study has been carried out to validate the results by comparing them with empirical data in the first model and with data generated by numerical simulation in the second. Results show that, from a set of measured operating conditions, it is possible to identify a unique set of electrochemical parameters that fits the 3D model to the target polarisation curve. The extension of this framework can be used to systematically estimate any model parameter in order to reduce the uncertainty in 3D simulation predictions. © 2021 The Author(s

Estudio faunístico del macizo de Quinto Real. I. Acaros Oribátidos (Acari, Oribatei)

Se han estudiado 3.995 ejemplares de ácaros oribátidos (Acari, Òribatei) de 65 muestras pertenecientes a dos hayedos de Quinto Real (Pirineos Occidentales), correspondientes a 69 especies de 43 géneros. Diez especies son nuevas para la Fauna de España Damaeus verticillipes (Nicolet) , Cepheus tuberoulosus Strenzke, Liaoarus tremella (Linneo), Cara bodes femoralis (Nicolet) , Carabodes retioulatus Berlese, Oppia translamellata~ (Willmann) , Oribella paolii Oudemans, Phauloppia luoorum (Linneo) , Bdwardzetes edwardsii (Nicolet) y Ophidiotrichus aonexus borussica (Sellnick) . Se dan las características climatológicas, geológicas, edafológicas y florísticas del biotopo

El género Prozercon Sellnick, 1943 en la Península Ibérica y descripción de tres nuevas especies (Acari, Mesostigmata, Zerconidae)

El género Prozercon Sellnick, 1943 se encontraba representado en la Península Ibérica por P. fimbriatus (C. L. Koch, 1839) y P. aristatus Athias-Henriot, 1961, ambas especies citadas para nuestra fauna por ATHIAS-HENRIOT (1961). Este género es relativamente rico en especies en Europa, como se pone de manifiesto en los trabajos de BLASZA(K1 974, (1975), BREGUETOVetA a l. (1977), HALASKOVA (1963, 1970), KARG (1971) y SELLNIC . En el estudio de los ácaros Mesostigmata realizado en diferentes hábitats de la provincia de Navarra, han aparecido seis especies pertenecientes a este género: P. lutulentus Halaskova, 1963 y P. ornatus (Berlese, 1904) que son citadas por primera vez en la Península sula, P. fimbriatus y tres nuevas especies: P.tellecheai sp. n., P. juanensis sp. n. y P. escalai sp. n. que son descritas en el presente trabajo

Characterization of Berlesiana Turk, 1943 and description of Berlesiana beunzana sp N from Spain (Acari, Mesostigmata, Epicriidae)

Résumé : Berlesiana beunzana n. sp. est décrit à partir de mâles et femelles en provenance de litière de chêne de Navarre (Espagne). Une révision de la définition du genre Berlesiana Turk, 1943 est présentée et la clef des espèces, basée sur les femelles, est établie.Summary: Berlesiana beunzana sp. nov. is described from adult females and males collected in oak forest litter and humus in Navarra. A revised description of the genus Berlesiana Turk, 1943 and a key to species, based on adult females, are provided

Composición, estructura y diversidad de la comunidad de Ácaros Mesostigmata de un hayedo natural (Fagus sylvatica) del sur de Europa

RESUMEN Se estudia la composición específica de la comunidad de ácaros Mesostigmata en una hayedo (Fagus sylvatica L.) de Navarra (España, Sur de Europa). Se han identificado 653 ácaros procedentes de 12 muestras. Estos representan a 41 especies de 14 familias y las especies más abundantes son Paragamasus ponantinus Athias-Henriot, 1967; Vegaia nemorensis (C. L. Koch, 1839); Paragamasus rothamstedensis Bhattacharyya, 1963 y Rhodacarus coronatus Berlese, 1921. La mitad de la comunidad habita en el horizonte húmico del suelo. En este hayedo el valor de la diversidad de Shannon (H´ log2) es 4,42 y el de la equitabilidad (J´) 0,82.ABSTRACT Species composition, structure and diversity of the soil Mesostigmata mite community in a natural beech forest (Fagus sylvatica) from southern Europe Species composition, structure and diversity of the soil Mesostigmatid mite’s community was studied in European beech forest (Fagus sylvatica L.) in Navarra (Spain, southern Europe). Twelve samples were taken and 653 mites were identified. They represented to 41 species from 14 families, the most abundant species being Paragamasus ponantinus Athias-Henriot, 1967; Veigaia nemorensis (C. L. Koch, 1839); Paragamasus rothamstedensis Bhattacharyya, 1963 and Rhodacarus coronatus Berlese, 1921. Haft part of the mites community inhabits the humic layer of the soil. The value of the Shannon’s diversity index (H´ log2) in the forest studied is 4,42, and the equitability (J´) is 0,82

First records of Endeostigmata and Sphaerolichina mites (Acari: Sarcoptiformes and Trombidiformes) from the Iberian Peninsula and the Canary Islands

ABSTRACT Endeostigmata and Sphaerolichina mites from the Iberian Peninsula and the Canary Islands are reported for the first time. A total of seven families, 14 genera and 16 species have been collected from oak and pine forests of Navarra (northern Spain) and other habitats of the Canary Islands. A key to families and genera identified in this study is presented.RESUMEN Primeras citas de ácaros Endeostigmata y Sphaerolichina (Acari: Sarcoptiformes and Trombidiformes) de la Península Ibérica e Islas Canarias. Este artículo es el primero que se dedica al estudio de los ácaros Endeostigmata y Sphaerolichina de la Península Ibérica y las Islas Canarias. Un total de siete familias, 14 géneros y 16 especies han sido recolectados en robledales y pinares de Navarra (Norte de España) y otros biotopos de las Islas Canarias. Se adjunta una clave para la identificación de las familias y géneros de estudio

Zercon parivus sp. n., una nueva especie de Acari (Mesostigmata: Zerconidae)

Se describe Zercon parivus sp. n., encontrada en la hojarasca y mantillo de robledales, hayedos, alerces y maquia en Navarra (Norte de Espana). Dicha especie muestra los siguientes caracteres: setas JJ -lx, Z1, Z2 y 51 no alcanzan la inserción de las setas siguientes; seta Z3 dos veces la longitud de Z2; Z4 alcanza la inserción de 54; 14 alcanza el margen anterior de los escleronódulos internos; glándula Po2 (gdZ1) lateral a la linea Z1-Z2; glándula Po3 (gdJ3) lateral a la linea Z3-Z4; 16, Z4 y 55 son las setas más largas del opistonoto; escleronódulos opistonotales agrupados (la distancia entre los intern os es aproximadamente igual al diámetro de uno de ellos). Se ilustra la ontogenia de la quetotaxia, adenotaxia y poroidotaxia del idiosoma.A new species, Zercon parivus n. sp., from Navarra (Northern Spain) is described. This species has been found in litter and humus from different deciduous forests (beech, oak and lark-tree) and busch grove. This specie is easy to recognize because of the following characters: setae JJ -lx, Z1, Z2 and 51 do not reach the insertion of the succeeding seta; setae Z3 twice the length of Z2; Z4 reach the insertion of 54; 14 reach the anterior margin of the inner pits; gland Po2 (gdZ1) lateral to the line Z1-Z2; gland Po3 (gdJ3) lateral to the line Z3-Z4; 16, Z4 and 55 are the longest opisthonotal setae; posterior pits associated in two groups including one inner and one lateral pit (distance between inner pits aproximately equal to the diameter of the pits). Dorsal and ventral chaetotaxy, adenotaxy and poroidotaxy for the larva, protonymph and adult is also described and illustrated

New records of zerconid mites from the Iberian Peninsula and the Macaronesian region (Acari: Mesostigmata: Zerconidae)

ABSTRACT Based on material collected from different habitats (natural, reforested and felled habitats) of Navarra (northern Spain), five species of the family Zerconidae are newly recorded and a key to the 29 species found in the Iberian Peninsula and the Macaronesian region, based on adult females, is provided. Ecological requirements, in terms of habitat preference, vertical distribution in the soil, and seasonal population changes of several species, are given.RESUMEN Nuevas citas de ácaros zercónidos para la Península Ibérica y la región Macaronésica (Acari: Mesostigmata: Zerconidae) Sobre material recolectado en diferentes habitas (naturales, bosques de reforestación y talados), de Navarra (Norte de España), se citan por primera vez para la fauna española cinco especies de la familia Zerconidae y se aporta una clave sistemática para hembras adultas de las 29 especies encontradas en la Península Ibérica y región Macaronésica. Para las especies más importantes se detallan algunos requerimientos ecológicos, tales como preferencia de hábitat, distribución vertical en el suelo y cambios estacionales de su población

How do roots respond to osmotic stress? A transcriptomic approach to address this question in a non-model crop

Drought is a complex phenomenon that is relevant for many crops. Performing high-throughput transcriptomics in non-model crops is challenging. The non-model crop where our workflow has been tested on is banana (Musa spp.), which ranks among the top ten staple foods (total production over 145 million tons in 2013 (FAOstat)[1]). Bananas need vast amounts of water and even mild-drought conditions are responsible for considerable yield losses[2]. To characterize drought in the roots of different banana genotypes, we designed a lab model based on osmotic stress (5% PEG treatment for 3 days) and performed mRNA-seq analysis[3]. Using Illumina technology, 18 cDNA libraries were sequenced producing around 568 million high quality reads, of which 70-84% were mapped to the diploid reference genome[4]. We show that the applied stress leads to a drop in energy levels inducing a metabolic shift towards (i) higher oxidative respiration, (ii) alternative respiration and (iii) fermentation. We also analyzed the expression patterns of paralogous genes belonging to the same gene families and detected possible cases of sub-functionalization