Search results for "Reflection"
showing 10 items of 645 documents
The Phases of Phosphatidyl Ethanolamine Monolayers
1992
For the first time phospholipid monolayers at the air/water interface have been studied by X-ray diffraction and reflection along the whole isotherm from the isotropic fluid to the ordered phases [1]. The model used to analyze the data — and the accuracy of the parameters deduced — were tested by comparing the results obtained with two lipids having the same head group but different chain lengths.
Structure analysis of titanate nanorods by automated electron diffraction tomography
2011
A hitherto unknown phase of sodium titanate, NaTi3O6(OH)·2H2O, was identified as the intermediate species in the synthesis of TiO2 nanorods. This new phase, prepared as nanorods, was investigated by electron diffraction, X-ray powder diffraction, thermogravimetric analysis and high-resolution transmission electron microscopy. The structure was determined ab initio using electron diffraction data collected by the recently developed automated diffraction tomography technique. NaTi3O6(OH)·2H2O crystallizes in the monoclinic space group C2/m. Corrugated layers of corner- and edge-sharing distorted TiO6 octahedra are intercalated with Na+ and water of crystallization. The nanorods are typically …
Digital Wisdom Development and Self-reflection of Teacher Candidates
2023
Being digitally wise allows today’s students not only to strengthen their natural abilities through existing technologies, but also to respond appropriately to learning networks that are increasingly complex. As a result, it is crucial that teachers and educators continually update and expand their professional knowledge base and improve their practices in order to meet the learning needs of their increasingly diverse students. The research has been conducted during the academic year 2021–2022 with the participation of 1173 teacher trainees enrolled in the Primary Education Degree Program at the University of Palermo. The trainees carried out their activities through digital tools. Brown an…
Weak regularity and consecutive topologizations and regularizations of pretopologies
2009
Abstract L. Foged proved that a weakly regular topology on a countable set is regular. In terms of convergence theory, this means that the topological reflection Tξ of a regular pretopology ξ on a countable set is regular. It is proved that this still holds if ξ is a regular σ -compact pretopology. On the other hand, it is proved that for each n ω there is a (regular) pretopology ρ (on a set of cardinality c ) such that ( RT ) k ρ > ( RT ) n ρ for each k n and ( RT ) n ρ is a Hausdorff compact topology, where R is the reflector to regular pretopologies. It is also shown that there exists a regular pretopology of Hausdorff RT -order ⩾ ω 0 . Moreover, all these pretopologies have the property…
Por mis hijos lo que sea... o casi. Identidades de madres y padres que han vivido un divorcio
2014
A partir de los discursos de personas divorciadas o separadas (de generaciones nacidas entre 1965 y 1975), se analiza la configuración de las identidades parentales. El divorcio implica reorganizar aspectos relativos al cuidado de hijos/as, favoreciendo la reflexión sobre la propia identidad parental. Nuestra hipótesis problematiza los resultados de Solsona y Ferrer (2010), quienes destacan la centralidad del hecho de ser madres y padres entre las generaciones mayores. Destacan entre los resultados que las mujeres reubican la maternidad al mismo nivel de importancia que otros aspectos de sus trayectorias vitales, mientras que los hombres tienden a idealizar la paternidad.; From the discours…
Spectroscopic properties of pure and Coumarin 153-doped thin films of sol-gel silica xerogels
1999
Abstract Thin-films doped with Coumarin 153, an important laser dye, have been prepared by the sol-gel method. Spectroscopic properties of the entrapped dye are studied by electronic absorption, diffuse reflectance, electronic excitation, emission and time-resolved emission techniques. The obtained results indicate that the entrapment of the dye results in formation of molecular aggregates having absorption and emission characteristics different from those of the monomeric dye. The blue matrix emission band (at approx. 450 nm) is relatively short-lived while the red band (at approx. 700 nm) displays a very long lifetime. Electronic excitation spectra of the sol-gel thin-films suggest that t…
New insights from recently migrated CROP multichannel seismic data at the outermost Calabrian arc accretionary wedge (Ionian sea)
2011
This study addresses selected aspects of the stratigraphic-structural setting of the outermost Calabrian Arc accretionary wedge and underlines relationships between structural development and Messinian evaporite stratigraphy through the analysis of re-processed CROP multichannel seismic reflection profiles. A detailed seismostratigraphic analysis, calibrated with P-velocities compiled by previous works, images a general bipartition of the Messinian evaporite deposits: the transparent «lower subunit» appears to have undergone ductile-flow deformation», with the development of salt-cored thrusting structures, and the layered «upper subunit» appears to be characterized by brittle deformation. …
Hellenic dimension: Materials of the Riga 3rd International Conference on Hellenic Studies
2012
The book is financially supported by the Hellenic Republic Ministry of Culture and Tourism and the University of Latvia. Grāmata izdota ar Grieķijas Republikas Kultūras un tūrisma ministrijas un Latvijas Universitātes atbalstu.
Some Critical Remarks on the Suitability of the Concept of the Photosynthetic Unit in Photosynthesis Research and Phytoplankton Ecology
1993
Based on the classical definition of the photosynthetic unit after Emerson and Arnold, new definitions are presented and their consistency subjected to critical reflection. Modern molecular approaches to determine the physiological condition or even the efficiency of the photosynthetic machinery via determination of the magnitude of the photosynthetic unit are discussed against the background of new data on the dynamics of the thylakoid membrane.
Basic variables in reflection-impulsivity: A training programme to increase reflectivity
1993
We found that reflective children in our study had better academic qualifications than impulsive ones. We worked with a sample of 201 Spanish children in their last year of Primary School. We elaborated and applied an intervention programme to increase reflectivity. The results were excellent and showed consistency and stability, which is very unusual in the context of R-I research. There was no significant difference between boys and girls’ performance on MFF20. The children were 12, 13 and 14 year olds and we found a reflection increase at 13 but not at 14. Contrary to the opinion of Salkind and Nelson on this point concerning MFFT, we believe that MFF20 is adequate for these ages. The Sp…