Search results for "SCA"
showing 10 items of 23299 documents
Opettajan ohjauksen ja vuorovaikutuksen antaman tuen merkitys oppilaiden rakentaessa mallia magnetismista
2013
The effects of socio-scientific issue based inquiry learning on pupils’ representations of landscape
2016
AbstractResearch has demonstrated that socio-scientific issues based inquiry learning has significant advantages for learning outcomes and students’ motivation. Further, a successful understanding of landscapes in environmental and geographical education can be achieved by combining informal learning environments with school education. Therefore this case study focuses on how socio-scientific issues based inquiry learning carried out in school and in a Nature Park, influences primary school pupils’ (n = 36) representations of landscapes. The pupils were asked to draw and write about landscape both before and after intervention. The data was analyzed qualitatively and quantitatively to inves…
Nomadtown, Manifesting the Global Village Hypothesis: A Case Study of a Rural Resilience Hub Within an Educational Milieu in North Karelia, Finland
2022
Artikkelissa esitellään NomadTown, joka on hätätilojen ennakointiin, torjuntaan ja sopeutumiseen sekä myönteisten vaikutusten tuottamiseen toimintansa perustava “resilienssihubi”. Artikkelissa hahmotellaan NomadTowniin kehittyneen alakulttuurin koulutuksellista taustaa ja tehdään syvällinen kuvaus NomadTownia ympäröivästä yhteiskunnasta oppimisen paikkana. Tämä kontekstuaalisointi nojaa tietoisuuteen dispositiivista Foucault'n tarkoittamassa mielessä. Tekstissä arvioidaan yhdistysten yhteiskuntaekologian, jonka puitteisiin tämä resilienssikeskus on asettumassa, soveltuvuutta ilmastonmuutoksen torjunnan edellyttämään suureen yhteiskunnalliseen transitioon. Lisäksi arvioidaan kuinka verkostom…
Keresztény iskolai nyelvi tájkép
2017
Irasomban az oktatas targyi kornyezetenek es az iskolai műveltsegnek a kapcsolatat elemzem az iskolai nyelvi tajkep vizsgalatanak keretein belul. Esettanulmanykent egy finnorszagi kereszteny iskolaval foglalkozom. Mig a finn oktatasi rendszerben (a tantervben es az oktatas szervezeseben) a vallasos műveltseg mas műveltsegteruletektől elkulonulten jelenik meg, a vizsgalt kereszteny iskola pedagogiai gyakorlatat a vallasos es nem vallasos műveltseget (ujra)egyesitő szemlelet hatarozza meg. Kulcsszavak: iskolai nyelvi tajkep, iskolai műveltseg, finn oktatas, Biblia, ima. In this paper, I deal with connections between the material environment of education and school literacy in the framework of…
On-Line Characterization of Gamma Radiation Effects on Single-Ended Raman Based Distributed Fiber Optic Sensor
2016
We report distributed temperature measurements based on Raman scattering performed during steady state $\gamma $ -ray irradiation at a dose rate of 1 kGy( ${\rm SiO}_{2}$ )/h and up to a total ionizing dose (TID) of $\sim 0.1\ \hbox{MGy}$ . We characterize on-line the evolution of the performances of a single-ended Raman distributed temperature sensor (RDTS) during the $\gamma $ -ray exposure of different classes of commercial multimode fibers (MMFs) acting as the sensing element. RDTS is influenced by the radiation-induced attenuation (RIA) phenomena leading to both large errors in the temperature measurements and a diminution of the useful sensing length. The amplitude of the radiation-in…
Efficient interrogation method of forward Brillouin scattering in optical fibers using a narrow bandwidth long-period grating
2020
A new technique, to the best of our knowledge, for the characterization of the effective refractive index modulation in optical fibers due to transverse acoustic mode resonances excited by electrostriction is reported. The resonances excited by an optical pulse are probed by a narrow bandwidth long-period grating (LPG) inscribed in the fiber, which is interrogated by a continuous wave (CW) beam. The LPG used in this experiment has a narrow bandwidth and high sensitivity to small mode index perturbations, allowing the measurement of index variations from below 10 − 9 to 10 − 6 . Radial and torsional-radial acoustic modes were characterized up to 1.1 GHz. The linewidth of resonances was found…
The relevance of point defects in studying silica-based materials from bulk to nanosystems
2019
The macroscopic properties of silica can be modified by the presence of local microscopic modifications at the scale of the basic molecular units (point defects). Such defects can be generated during the production of glass, devices, or by the environments where the latter have to operate, impacting on the devices’ performance. For these reasons, the identification of defects, their generation processes, and the knowledge of their electrical and optical features are relevant for microelectronics and optoelectronics. The aim of this manuscript is to report some examples of how defects can be generated, how they can impact device performance, and how a defect species or a physical phenomenon …
Solar radiative effects of a Saharan dust plume observed during SAMUM assuming spheroidal model particles
2011
The solar optical properties of Saharan mineral dust observed during the Saharan Mineral Dust Experiment (SAMUM) were explored based on measured size-number distributions and chemical composition. The size-resolved complex refractive index of the dust was derived with real parts of 1.51–1.55 and imaginary parts of 0.0008–0.006 at 550 nm wavelength. At this spectral range a single scattering albedo ω o and an asymmetry parameter g of about 0.8 were derived. These values were largely determined by the presence of coarse particles. Backscatter coefficients and lidar ratios calculated with Mie theory (spherical particles) were not found to be in agreement with independently measured lidar data.…
Synthesis, Optical, and Morphological Studies of ZnO Powders and Thin Films Fabricated by Wet Chemical Methods
2020
Zinc oxide nanoparticles were prepared from Zn5(CO3)2(OH)6 precursor, capped with poly(vinylpyrrolidone) (PVP), and annealed at 600 °
Unravelling the Intertwined Atomic and Bulk Nature of Localised Excitons by Attosecond Spectroscopy
2021
The electro-optical properties of most semiconductors and insulators of technological interest are dominated by the presence of electron-hole quasi-particles, called excitons. The manipulation of excitons in dielectrics has recently received great attention, with possible applications in different fields including optoelectronics and photonics. Here, we apply attosecond transient reflection spectroscopy in a sequential two-foci geometry and observe sub-femtosecond dynamics of a core-level exciton in bulk MgF2 single crystals. Furthermore, we access absolute phase delays, which allow for an unambiguous comparison with theoretical calculations. Our results show that excitons surprisingly exhi…