Search results for "EFL"
showing 10 items of 2506 documents
Digital zenith camera for vertical deflection determination
2012
Recent accomplishments in advancement of accurate astrometric reference star catalogues, development of digital imaging technology, high accuracy tiltmeter technology, and geocentric coordinate availability provided by GNSS, have made possible accurate, fast and automated determination of vertical deflections using astrometric methods. Zenith cameras for this kind of measurements have been developed or are being developed by several research groups. The paper describes a research project by Institute of Geodesy and Geoinformation, intended to design a portable digital zenith camera for vertical deflection determination with 0.1” expected accuracy. Camera components are described, proposed d…
Digital signal processing applied to noisy acoustic data.
2007
Frequently we deal with analog data from noisy acoustic measurements which need a preprocessing prior to the extraction of the information embedded. Data deterioration may be due to several reasons, for example: data recording on obsolete and technological poor support; bad signal conditioning (poor signal-to-noise ratio, non linearity and/or timevariance of the system under test). Sometimes information to be extracted from data is not conventional so it needs a dedicated processing. In this paper a novel audio data processing method from the autors experience in ancient open-air theatres research is shown.
La dirigenza pubblica: criteri di identificazione e specialità della disciplina.
Nel tentativo di far luce sui maggiori coni d’ombra che emergono dalla relativa disciplina speciale del rapporto di lavoro, la tesi riflette l’esigenza di un ripensamento sistematico della figura del dirigente pubblico, nell’ottica di prospettare de iure condendo possibili correttivi. A tal fine, sono analizzate le peculiarità ed attribuzioni della dirigenza pubblica, in chiave storico-evolutiva, alla luce dei principi costituzionali e del processo riformatore che ha contrassegnato la magmatica materia, a tutt’oggi in atto. E’, altresì, rivolto uno sguardo comparativistico alla disciplina del personal directivo español, rivelandosi la stessa, speculare a quella del dirigente italiano quanto…
Crystal growth and characterization of Zn1-xMgxO advanced micro- and nanostructures
2018
Dentro de la creciente área de investigación de la física de semiconductores, los pertenecientes a la familia II-VI se han convertido en un campo fundamental de la física de materiales debido a que sus propiedades fotofísicas son únicas para crear una nueva generación de dispositivos en el campo de la fotónica y la microelectrónica. Entre ellos, los semiconductores basados en ZnO han ganado un considerable interés en la comunidad científica en parte debido a su alta energía de enlace del excitón (60 meV) la cual es 2.4 veces más alta que la energía térmica a temperatura ambiente. Este hecho puede dar lugar a emisión laser excitónica a temperaturas incluso mayores que la ambiente. Además, gr…
Drāmas paņēmieni angļu valodas runāšanas trauksmes mazināšanai 6. klasē
2016
Lielākā daļa cilvēku, kuri mācās angļu valodu kā svešvalodu, saskaras ar angļu valodas runāšanas trauksmi. Tā negatīvi ietekmē gan skolēnu sniegumu, gan attieksmi. Pētījums tika izstrādāts ar mērķi pārbaudīt, kā drāmas paņēmieni samazināja skolēnu angļu valodas runāšanas trauksmi 6.klasē. Angļu valodas stundās 6.klasē tika izmantotas dažādas drāmas aktivitātes. Darbā tika lietotas tādas datu vākšanas metodes kā diagnosticējošs tests (pirms un pēc drāmas paņēmienu ieviešanas), intervija, novērošana un atgriezeniskā saite. Diagnosticējošā testa rezultāti norādīja, ka skolēni saskārās ar angļu valodas runāšanas trauksmes pazīmēm. Drāmas paņēmienu izmantojums palielināja skolēnu aktivitāti angļ…
ESR study of thianthrenium radical cation within acid zeolites
1997
Abstract Thianthrene (E ox = 1.47 V vs NHE) has been adsorbed into a series of zeolites beta (s) and ZSM-5 in the NH 4 + or H + forms, having different particle size and Si/Al ratio. The resulting population of generated thianthrenium radical cation was determined by a combination of diffuse reflectance and ESR spectroscopies. From the results obtained it can be concluded: i) the process takes predominantly place in the interior of the voids (XPS measurements and lack of influence of the particle size); ii) ZSM-5 is more efficient than zeolite s; iii) no strong acid sites are required (both NH 4 + and H + forms produced very similar spin concentrations); iv) the zeolite framework acts isola…
The [Fe(etz)6](BF4)2 Spin-Crossover System—Part One: High-Spin ⇌ Low-Spin Transition in Two Lattice Sites
1996
The [Fe(etz),](BF,), spin-cross-over system (etz = 1-ethyl-1 H-tetrazole) crystallizes in space group P1, with the following lattice constants at 298 K: a 10.419(3), b=15.709(1), c = 18.890(2) A = = 71.223(9), =77.986(10), and = 84.62(1)° V = 2862.0(9) A3 and Z = 3. Two nonequivalent lattice sites, one without (site A) and one with (site B) inversion symmetry, are observed. The population of the two sites nA:nB is 2:l. Iron(II) on site A undergoes a thermal low-spin (LS) high-spin (HS) transition with T1/2I, = 105 K. whereas that on site B remains in the high-spin state down to cryogenic temperatures. Application of external pressure of up to 1200 bar between 200 and 60 K does not cause for…
Sex and population variation in ultraviolet reflectance of colour patches in Gallotia galloti (Fam. Lacertidae) from Tenerife (Canary Islands)
2005
Sex and population differences in the ultraviolet (UV) reflectance patterns of two phenotypically divergent lacertids from Tenerife, Gallotia galloti eisentrauti and G. g. galloti, are described. Adults in both populations have rows of lateral and ventro-lateral blue patches on either side of the trunk that show a single peak of reflectance in the near UV. The lateral patches of males are more intensely reflective than those of females, but females have more chromatic and UV-shifted lateral patches than males. Most G. g. eisentrauti and some G. g. galloti also have blue cheek patches on either side of the gular area. Male cheek patches have reflectance peaks in the near UV, whereas those of…
Variation in mortality among populations is higher for pymetrozine than for imidacloprid and spiromesifen inTrialeurodes vaporariorumin greenhouses i…
2014
BACKGROUND Insecticide resistance in Trialeurodes vaporariorum W. is unknown in the species' northern distribution range where it inhabits mainly commercial greenhouses. Resistance development in whiteflies feeding on year-round crops in greenhouses is possible owing to the use of chemical treatments to back up biocontrol. The authors tested the response levels to spiromesifen, pymetrozine and imidacloprid in whiteflies collected from seven greenhouses within a 35 km radius in western Finland. RESULTS All except one (PR) population had LC50 values below the recommended concentrations for the tested compounds. However, some populations showed reduced susceptibility to pymetrozine in comparis…
Ricerca com-partecipata e sperimentazione didattica in campo educativo
2022
Il saggio riflette sulla specificità della ricerca educativa e la accomnuna alla ricerca in campo sociale; ritrova infatti le connessioni nel valore politico, nelle ricadute sulla prassi, e nella prospettiva etica. In questo senso viene evidenziata la possibilità di connettere teoria, metodologia ed esperienza (e, ad un livello meta, di riflettere su tale connessione) e il fatto che questo processo si configura nei termini di una “apprendimento continuo”, sui piani individuale, di gruppo, istituzionale. Ritrovando l’origine di tale prospettiva nell’opera di Dewey (1929), viene quindi evidenziato lo stretto raccordo tra esperienza e pensiero, riflessione e pratica, presente in ogni processo …