Search results for "fer"
showing 10 items of 33109 documents
Makroreoloģiskie mērījumi Pf1 vīrusa un magnētisko daļiņu sistēmai ārējā laukā
2015
Darbā tiek aplūkotas dažādas sistēmas, ko veido bakteriofāga vīruss un ferošķidruma maghemīta nanodaļiņas, mainoties ferošķidruma tilpuma daļai. Galvenā uzmanība tiek pievērsta sistēmas izotropa gēla stāvoklim, kam piemīt viskoelastiskās īpašības, kā arī šķidrā kristāla kūļu fāzei. Izmantojot reometrijas un dinamiskās gaismas izkliedes metodes, šie stāvokļi arī tika izmantoti primārā darba mērķa sasniegšanai: sistēmas reoloģisko parametru noteikšanai ārējā magnētiskajā laukā. Zinot sistēmas un to reoloģisko parametru uzvedību dotajos apstākļos, ir iespējams secināt par to iekšējiem procesiem, kā arī par materiāla, ko veido dotā sistēma, īpašībām. Rezultāti tika salīdzināti ar pieejamiem zin…
Sustained attention required for effective dimension-based retro-cue benefit in visual working memory
2023
In visual working memory (VWM) tasks, participants’ performances can be improved through the use of dimension-based retro-cues, which direct internal attention to prioritize a particular dimension (e.g., color or orientation) of VWM representations even after the stimuli disappear. This phenomenon is known as the dimension-based retro-cue benefit (RCB). The present study investigates whether sustained attention is required for the dimension-based RCB by inserting interference or interruption between the retro-cue and the test array to distract attention. We tested the effects of perceptual interference or cognitive interruption on dimension-based RCB when the interference (Experiments 1 and…
Género y enfermedad en la visualidad artística del fin de siglo español (1889-1921)
2022
La introducción de la modernidad artística en España en la segunda mitad del siglo XIX hizo de la enfermedad un tema que se trasladó a la visualidad artística. A pesar de arrastrarse algunos asuntos anclados en la tradición, los parámetros de representación en torno a lo patológico se renovaron, y las imágenes gestadas en este contexto reflejan muchos de los cambios acontecidos a nivel tecnológico, científico y social, enlazando con el ideario del progreso burgués. Ante la inminente llegada del fin de siglo, el tema de la enfermedad toma un nuevo rumbo en relación a otros discursos visuales que integran la imagen de la mujer y del hombre enfermos. Lo patológico se carga, en este momento, de…
An Upper Mississippian echinoderm microfauna from the Genicera Formation of northern León (Carboniferous, Cantabrian Mountains, N Spain)
2020
For the first time an echinoderm microfauna is recorded from the cephalopod limestone facies (‘griotte facies’) of the lower Carboniferous (Mississippian) Genicera Fm. (Alba Fm.). The formation is widespread in the Cantabrian Mountains in NW Spain, but the ossicles are from some sections in the surroundings of the Bernesga valley in northern León. They have been derived from insoluble acetic acid residues from samples of the upper and especially of the uppermost part of the formation (Canalón Mb. and Millaró Beds). The microfauna include taxonomically treated wheel-shaped ossicles, sieve-plates and rods of holothurians, goniodonts of ophiocistioids, and ophiuroid and stenuroid skeletal elem…
Endophytic Fungi in Asymptomatic Vitis vinifera L. and their Effects on Plasmopara viticola
2016
During a multi-year study on the life cycle of Plasmopara viticola to assess the typical epidemiology of downy mildew on grapevine (Vitis vinifera) in west Sicily (Italy), several leaves on which the downy mildew had collapsed were found and observed in a vineyard located in Marsala, in Trapani Province. An antagonistic fungus was isolated from these leaves and named A20; through its morphology, it was identified as a hyphomycete belonging to the genus Acremonium. The antagonism of A20 against the asexual and sexual spores of P. viticola, as well as endophytic nature of the genus Acremonium in V. vinifera were confirmed by further studies which have been carried out over the past decade. In…
Dzimuma loma valodas lietojumā lietišķajās prezentācijās
2018
Šajā bakalaura darbā tiek pētīta dzimumu loma valodu lietojumā lietišķajās prezentācijās, jo mūsdienu sabiedrībā cilvēkiem tagad ir jārunā publiski vairāk nekā jebkad agrāk. Bakalaura darba mērķis ir izpētīt, kā valodas lietojumu lietišķajās prezentācijās ietekmē runātāja dzimums. Autore ir pētījusi vairākus teorētiskos avotus par komunikāciju, lietišķajām prezentācijām un dzimuma atšķirībām runā. Autore ir izpētījusi piecas vīriešu un piecas sieviešu ar uzņēmējdarbību saistītas prezentācijas. Lai analizētu atšķirības starp vīriešu un sieviešu valodas lietojumu izvēlētajās lietišķajās prezentācijās, tiek izmantota kvalitatīva gadījumu izpētes pieeja. Tiek secināts, ka valodas lietojumu liet…
Lidar detection of carbon dioxide in volcanic plumes
2015
Volcanic gases give information on magmatic processes. In particular, anomalous releases of carbon dioxide precede volcanic eruptions. Up to now, this gas has been measured in volcanic plumes with conventional measurements that imply the severe risks of local sampling and can last many hours. For these reasons and for the great advantages of laser sensing, the thorough development of volcanic lidar has been undertaken at the Diagnostics and Metrology Laboratory (UTAPRAD-DIM) of the Italian National Agency for New Technologies, Energy and Sustainable Economic Development (ENEA). In fact, lidar profiling allows one to scan remotely volcanic plumes in a fast and continuous way, and with high s…
Volcanic Plume CO2 Flux Measurements at Mount Etna by Mobile Differential Absorption Lidar
2017
Volcanic eruptions are often preceded by precursory increases in the volcanic carbon dioxide (CO2) flux. Unfortunately, the traditional techniques used to measure volcanic CO2 require near-vent, in situ plume measurements that are potentially hazardous for operators and expose instruments to extreme conditions. To overcome these limitations, the project BRIDGE (BRIDging the gap between Gas Emissions and geophysical observations at active volcanoes) received funding from the European Research Council, with the objective to develop a new generation of volcanic gas sensing instruments, including a novel DIAL-Lidar (Differential Absorption Light Detection and Ranging) for remote (e.g., distal) …
Decoupled control scheme of grid-connected split-source inverters
2017
Grid-connected power conversion systems for renewable energy sources must fulfill several requirements, e.g., the high efficiency, the reduced cost and complexity, and, quite often, the boost capabilities that is usually achieved using a front-end dc–dc boost converter before the inversion stage, leading to a two-stage architecture. Meanwhile, single-stage power conversion systems, which perform the boosting operation within the inversion one, offer some potential advantages, in terms of reducing the complexity and the volume of the whole system. Among several proposed options, the split-source inverter (SSI) has been recently proposed by Abdelhakim et al. as an alternative option with some…
Relationship between volume and energy of vector fields
2001
Abstract A unified study of energy and volume functionals is presented here by determining the critical points of a functional that extends simultaneously energy and volume and that is defined on the product of the manifold of smooth maps C∞(M,N) times the manifold M of riemannian metrics on M. The restriction of this functional to different submanifolds of the space of vector fields X (M)× M is also considered, and used to study several functionals generalizing volume and energy or total bending of vector fields