Search results for "Metis"
showing 10 items of 74 documents
The first coronal mass ejection observed in both visible-light and UV HI Ly-α channels of the Metis coronagraph on board Solar Orbiter
2021
Context.The Metis coronagraph on board Solar Orbiter offers a new view of coronal mass ejections (CMEs), observing them for the first time with simultaneous images acquired with a broad-band filter in the visible-light interval and with a narrow-band filter around the H ILy-αline at 121.567 nm, the so-called Metis UV channel.Aims.We show the first Metis observations of a CME, obtained on 16 and 17 January 2021. The event was also observed by the EUI/FSI imager on board Solar Orbiter, as well as by other space-based coronagraphs, such as STEREO-A/COR2 and SOHO/LASCO/C2, whose images are combined here with Metis data.Methods.Different images are analysed here to reconstruct the 3D orientation…
Retrieval of sun-induced fluorescence using advanced spectral fitting methods
2015
Abstract The FLuorescence EXplorer (FLEX) satellite mission, candidate of ESA's 8th Earth Explorer program, is explicitly optimized for detecting the sun-induced fluorescence emitted by plants. It will allow consistent measurements around the O2-B (687 nm) and O2-A (760 nm) bands, related to the red and far-red fluorescence emission peaks respectively, the photochemical reflectance index, and the structural-chemical state variables of the canopy. The sun-induced fluorescence signal, overlapped to the surface reflected radiance, can be accurately retrieved by employing the powerful spectral fitting technique. In this framework, a set of fluorescence retrieval algorithms optimized for FLEX ar…
Orbital dimerization in NaTiSi2O6: An orbital analogue of the spin-Peierls phase transition
2004
We measure the Raman scattering spectra of NaTiSi2O6, analyze the vibrational properties, and study the origin of the phase transition in this compound. In this quasi-one-dimensional S = 1/2 system we observe anomalous high-temperature phonon broadenings, and large changes of the phonon energies and line-widths across the phase transition temperature of 210 K. These results, combined with theoretical considerations, indicate that the phonon anomalies originate from an orbital order-disorder type of phase transition. We find that the high temperature dynamical Jahn-Teller phase of NaTiSi2O6 exhibits a spontaneous breaking of translational symmetry into a dimerized, Jahn-Teller distorted, orb…
2 - 3 gadu vecu bērnu matemātisko priekšstatu apguves veicināšana ar priekšmetiskām darbībām
2017
Kvalifikācijas darbu izstrādāja Laura Breča Kvalifikācijas darba nosaukums: 2 – 3 gadu vecu bērnu matemātisko priekšstatu apguves veicināšana priekšmetiskā darbībā. Kvalifikācijas darba mērķis ir izpētīt 2 – 3 gadu vecu bērnu priekšstatu veidošanas iespējas par formu priekšmetiskajā darbībā. Kvalifikācijas darbs ir strukturēts nodaļās. Sākumā ir ievads, kur aprakstīta kvalifikācijas darba temata aktualitāte, mērķis, uzdevumi, pētījuma objekts, priekšmets, metodes, periods un bāze, kā arī darba struktūra. Kvalifikācijas darba teorētiskajā daļā tiek pētītas 2- 3 gadu vecu bērnu attīstības īpatnības un matemātiskie priekšstati pirmsskolas vecumā. Kvalifikācijas darba praktiskajā daļā tiek veik…
Gridding artifacts on medium-resolution satellite image time series: MERIS case study
2011
Earth observation satellites provide a valuable source of data which when conveniently processed can be used to better understand the Earth system dynamics. In this regard, one of the prerequisites for the analysis of satellite image time series is that the images are spatially coregistered so that the resulting multitemporal pixel entities offer a true temporal view of the area under study. This implies that all the observations must be mapped to a common system of grid cells. This process is known as gridding and, in practice, two common grids can be used as a reference: 1) a grid defined by some kind of external data set (e.g., an existing land-cover map) or 2) a grid defined by one of t…
Modelling leaky photonic wires: a mode solver comparison
2006
We present results from a mode solver comparison held within the framework of the European COST P11 project. The structure modelled is a high-index contrast photonic wire in silicon-oninsulator subject to substrate leakage. The methods compared are both in-house developed and commercial, and range from effective index and perturbation methods, over finite-element and finite-difference codes, beam propagation methods, to film mode matching methods and plane wave expansion methods.
α-Chymotrypsin-Catalyzed Reaction Confined in Block-Copolymer Vesicles
2010
Herein the reactivity of the enzyme α-chymotrypsin in the confinement of polystyrene-block-poly(acrylic acid) (PS-b-PAA) vesicles was investigated. Enzyme and substrate molecules were encapsulated in PS-b-PAA vesicles with internal diameters ranging from 26 nm to 165 nm during the formation of the vesicles. While the loading efficiencies of enzyme and substrate molecules were practically identical for vesicles of identical size, they were found to increase with decreasing vesicle size. The kinetics of the α-chymotrypsin catalyzed hydrolysis of N-succinyl-Ala-Ala-Phe-7-amido-4-methylcoumarin (AMC) was evaluated following the increase of the absorption of the product 7-amino-4-methylcoumarin …
Two discourses: researchers and policy-making in higher education
1995
The theme of this article focuses on how policy discourse and research discourse meet in contract research in higher education. The interplay of these discourses has consequences for researchers who have to balance conflicting demands, which we view as links between research and policy cycles. Two evaluation studies on the introduction and effects of new policy instruments are discussed, focusing on the interaction between policy needs, and research design. The examples are taken from policies in the development towards increasing self-regulation in higher education, of which Finland and the Netherlands are interesting examples in the European context.
'Hin und zurück'. Zur italienischen Rezeption fachliterarischer Texte aus dem deutschsprachigen Kulturraum 1m 16. Jahrhundert
2018
Ein dichtes Netz verband die Gelehrten aus vielen europäischen Territorien im Verlauf des 15. und 16. Jahrhunderts. Die meisten Impulse und Anre- gungen gingen damals aus dem italienischen Kulturraum aus. Der vorliegende Beitrag stellt die Hypothese auf, dass jene Impulse und Anregungen nördlich der Alpen einen so fruchtbaren Boden fanden, dass die ‚neuen‘ Ideen nicht nur ihren Schatten zurück- warfen, sondern weitere ertragreiche Keime in Italien legen konnten. Der italienische Kulturraum beschäftigte sich tatsächlich intensiv mit der Fachliteratur aus dem Norden, viele Werke zirkulierten allerdings in ihrer ursprünglichen lateinischen Fassung, und sie wurden auch nicht selten einfac…
Widerspruch als konstitutives Element der Wissensvermittlung in literarischen Texten des späten 16. Jahrhunderts
2019
In the second half of the sixteenth century, the transfer of knowledge is a con- flict situation: on the one hand, there is a generalised thirst for knowledge but, on the other, a fear of the circulation of new ideas on the part of both the secular and religious authorities. This was especially the case with regard to informa- tion related to the areas of medicine, astronomy, and alchemy-magic which was banned or censored. This paper argues that many authors relied on a Poetics of Contradiction in order to be able to transmit this information. Despite appa- rently opposing statements or thanks to their apparent opposition, they trans- mitted a meaningful message and allowed attentive, eliti…