Search results for " Methods"
showing 10 items of 4102 documents
ELECTROCHEMICAL METHODS DETERMINATION OF HEAVY METALS IN WINE BEVERAGE ACHIEVING ECOSANOGENE
2014
In this work, we estimated reproducibility and procedures to improve the selectivity of the method and to determine the influence of different analytical parameters (pH, electrolyte composition, deposition time and potential, presence of ligands). Detection limit of copper in samples of white wine and red Blaj (Romania) is 2.4 ppm, with a deviation of 1.5-2,0%. The results were compared with the results by atomic adsorption classical method. The sensitivity of the method is two times smaller, Daton this Pb2- ions.
Multipactor radiation analysis within a waveguide region based on a frequency-domain representation of the dynamics of charged particles
2009
[EN] A technique for the accurate computation of the electromagnetic fields radiated by a charged particle moving within a parallel-plate waveguide is presented. Based on a transformation of the time-varying current density of the particle into a time-harmonic current density, this technique allows the evaluation of the radiated electromagnetic fields both in the frequency and time domains, as well as in the near- and far-field regions. For this purpose, several accelerated versions of the parallel-plate Green's function in the frequency domain have been considered. The theory has been successfully applied to the multipactor discharge occurring within a two metal-plates region. The proposed…
Electron and photon performance measurements with the ATLAS detector using the 2015-2017 LHC proton-proton collision data
2019
This paper describes the reconstruction of electrons and photons with the ATLAS detector, employed for measurements and searches exploiting the complete LHC Run 2 dataset. An improved energy clustering algorithm is introduced, and its implications for the measurement and identification of prompt electrons and photons are discussed in detail. Corrections and calibrations that affect performance, including energy calibration, identification and isolation efficiencies, and the measurement of the charge of reconstructed electron candidates are determined using up to 81 fb−1 of proton-proton collision data collected at √s=13 TeV between 2015 and 2017.
Caffeine analysis and extraction from a topical cream intended for UV-skin protection
2020
Made available in DSpace on 2021-06-25T10:16:59Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01 This study aimed to develop and validate a method for the analysis of caffeine in complex cosmetic samples, such as sunscreens. Besides, an extraction method of caffeine from coffee oil and from creams, which contains both lipophilic and hydrophilic components, has been developed. The method to analyze caffeine was developed using an isocratic pump, Waters 1515 and an automatic injector Perkin-Elmer Series 200 and an UV detector Perkin-Elmer. As stationary phase, Kromasil C-18 (150 × 4.6 mm ID with particle size of 5 µm) column was used and a mixture of water (pH 4.00)/acetonitrile (…
Luovat terapiat ja empaattisen kohtaamisen kaipuu suomalaisten mielisairaalamuistojen valossa
2018
Tutkin suomalaisten mielisairaalamuistoja Muistoihin kaivertuneet tilat ‐hankkeessa. Muistelukeruuseen lähetetyt potilaiden muistot ovat suurelta osin häpeän ja traumantäyteisiä, vaikka positiivisiakin kokemuksia mahtuu joukkoon. Luovien terapioiden kannalta ilahduttavaa on se, että niiden osalta kenelläkään muistojaan lähettäneellä potilaalla ei ollut pahaa sanottavaa. Luovia terapioita olen käyttänyt myös muisteluaineiston hyödyntämisessä. Olen järjestänyt neljä työpajaa, joissa olen käyttänyt aineiston karuimpia potilaskokemuksia terapeuttisen kirjoittamisen materiaalina tavoitteenani aktivoida ihmisten empatiakykyä ja sen kautta tarkastella traumatisoivan ja vastaavasti hoitavan kohtaam…
Evaluation of the water scarcity energy cost
2009
Convergence of dynamic programming principles for the $p$-Laplacian
2018
We provide a unified strategy to show that solutions of dynamic programming principles associated to the $p$-Laplacian converge to the solution of the corresponding Dirichlet problem. Our approach includes all previously known cases for continuous and discrete dynamic programming principles, provides new results, and gives a convergence proof free of probability arguments.
Technical issues in beginning violin: an exploratory study in the classroom with 4-5 years old preschoolers
2018
Conocer los errores técnicos de los alumnos en la enseñanza de la música puede ser de gran ayuda en la planificación de la enseñanza instrumental en sus fases iniciales. Esto es particularmente valioso en el trabajo con alumnado de 4-5 años. Este estudio explora esta cuestión mediante una Investigación-Acción realizada con 11 estudiantes voluntarios de dichas edades. A lo largo de 30 sesiones individuales de 30 minutos, se recogieron datos mediante observación participante realizada por el profesor en una Escuela Municipal de Música, comparándose dos aproximaciones didácticas de iniciación al violín. Una aproximación se centró en el manejo de la mano derecha (aproximación MD), introduciendo…
Frihet, fantasi og utfoldelse: En kvalitativ studie av estetiske arbeidsformer i lærerutdanningene
2017
Artikkelen undersoker hva slags forstaelse laererutdannere og laererstudenter har av estetiske arbeidsformer i undervisningen i laererutdanningene. Studien er en kvalitativ intervjuundersokelse blant laererutdannere og laererstudenter ved en norsk laererutdanningsinstitusjon. I lys av danningsteoretisk og didaktisk teori, finner studien at laererutdannere og laererstudenters forstaelse av estetiske arbeidsformer i undervisningen er kjennetegnet av «frihet» som fravaer av tvang og fasit i arbeid med laerestoffet, «fantasi» som bruk av forestillingsevnen slik at kunnskapen blir personlig, og «utfoldelse» som sosialisering inn i et fellesskap gjennom tilbakemeldinger pa egen atferd. Til sammen…
Making Sense of Senses. Interview with Dorothy Noyes
2010
I interviewed Dorothy Noyes, Director of the Center for Folklore Studies, and As- sociate Professor of English, Comparative Studies, and Anthropology Ohio State University, Columbus (United States). Currently, her research interests involve the collective representations of plural societies, the social organization of vernacular creativity, and the history of international cultural regimes. Her primary fieldwork is in Catalonia, Spain, where she has studied the politics of local festivities. It was her book Fire in the Plaça (2003) that put some questions to my head about senses and encouraged me to get engaged with sensual experiences of ethnographic fieldwork. nonPeerReviewed