Search results for "REF"
showing 10 items of 8690 documents
Mechanical and optical properties of as-grown and thermally annealed titanium dioxide from titanium tetrachloride and water by atomic layer deposition
2021
Funding Information: This work was carried out within the MECHALD project funded by Business Finland (Tekes) and is linked to the Finnish Centers of Excellence in Atomic Layer Deposition (ref. 251220) and Nuclear and Accelerator Based Physics (refs. 213503 and 251353) of the Academy of Finland. Funding Information: This work was carried out within the MECHALD project funded by Business Finland (Tekes) and is linked to the Finnish Centers of Excellence in Atomic Layer Deposition (ref. 251220 ) and Nuclear and Accelerator Based Physics (refs. 213503 and 251353 ) of the Academy of Finland. Publisher Copyright: © 2021 The use of thin-films made by atomic layer deposition (ALD) is increasing in …
Long-transient conoscopic pattern technique
1999
0038-1098; Recent results on laser induced anisotropy in terbium gallium garnet are extended to the dynamic regime. We observed that the characteristic conoscopic pattern formation time presents a quadratic dependence on the beam size. The observed pattern intensity is accounted for by a simple analytical formula. The transient refractive index change due to thermal stress in the terbium gallium garnet is determined. (C) 1999 Elsevier Science Ltd. All rights reserved.
Refractive index sensing by a silicon metasurface
2022
The availability of smart materials represents a key enabling milestone for the realization of smart sensors. In this research field, optical sensing has gained a lot of attention in various applications ranging from basic physics to chemistry and biology. Here, we exploit the non-invasive nature of light to achieve an innovative sensor based on all-optical dielectric nano-resonators arranged in a periodic fashion. The proposed sensor can measure refractive index changes up to 10(-6).
Influence of PDA Coating on the Structural, Optical and Surface Properties of ZnO Nanostructures
2020
Polydopamine (PDA) is a new biocompatible material, which has prospects in biomedical and sensor applications. Due to functional groups, it can host wide range of biomolecules. ZnO nanostructures are well known templates for optical sensors and biosensors. The combination of ZnO and PDA results in a change of optical properties of ZnO&ndash
Apmiglojuma adaptācija laikā
2016
Bakalaura darbs ir uzrakstīts latviešu valodā uz 30 lapaspusēm. Tas satur 15 attēlus, 11 tabulas, 21 literatūras atsauci. Mērķis: Noskaidrot, kā redzes asums mainās apmiglojuma adaptācijas laikā emetropas un miopas refrakcijas dalībniekiem. Pētījumā piedalījās 6 emetropas un 6 miopas refrakcijas dalībnieki. Pētījums sastāvēja no četrām sesijām. Tika izmantoti divi dažādi apmiglojuma līmeņi monokulāros un binokulāros apstākļos. Miopas refrakcijas dalībniekiem adaptācija laikā notika visās pētījuma sesijās. Emetropas refrakcijas dalībnieki nespēja adaptēties monokulāram optiskajam apmiglojumam laikā, apmiglojuma līmeņa palielināšana sekmēja monokulāru adaptācijas dinamiku. Starp refrakcijas g…
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…
Fluctuaciones refractivas en la diabetes mellitus. Implicaciones en la praxis optométrica
2014
El objetivo de este trabajo se centra en cómo los niveles de glucosa en sangre en personas que padecen de diabetes mellitus, afecta a la fluctuación refractiva del ojo, y cuáles pueden ser las implicaciones en la praxis optométrica. Para lograr este objetivo, se ha llevado a cabo una investigación de tipo documental basada en la revisión y el análisis de la literatura científica general y específica existente sobre la temática. Se ha analizado cómo la glucemia afecta a las diferentes partes del ojo de una forma independiente, a corto y a largo plazo. El trabajo se ha estructurado en varios apartados donde se abordan las siguientes temáticas: relevancia de la enfermedad en el mundo, resumen …
Optotipu kontrasta ietekme uz redzes asuma un subjektīvās refrakcijas novērtējumu
2021
Darbs ir uzrakstīts latviešu valodā uz 46 lapaspusēm. Tas satur 25 attēlus, 1 tabulu, 2 pielikumus un 37 atsauces uz literatūras avotiem. Darba mērķis bija izpētīt optotipu kontrasta izmaiņas un šo izmaiņu ietekmi uz redzes asuma un subjektīvās refrakcijas noteikšanas precizitāti. Redzes asums un subjektīvā refrakcija, kas nodrošina maksimālo redzes asumu pie 6 dažādiem optotipa kontrastiem (100 %, 75 %, 50 %,30 %, 10 % un 5 %), tika noteikta 28 dalībniekiem. Papildus tika veikta redzes aprūpes specialistu anketēšana. Netika atklātas subjektīvās refrakcijas un redzes asuma izmaiņu atšķirības augsta kontrasta optotipiem, bet būtisks redzes asuma samazinājums un subjektīvās korekcijas novirze…
Las formas cotidianas de la felicidad y sus mandatos: Pedagogías del pensamiento positivo, trabajo docente y subjetividad en el neoliberalismo contem…
2020
Positive thinking constitutes one of the great traditions that lead to the idea of the subject as an entrepreneur of himself and is perhaps one of the best that has successfully condensed cultural, political, social and pedagogical processes linked to reflection on well-being in this historical time. The teaching work is especially moved by the pregnancy of these perspectives that challenge the pedagogical field and the education workers as ?agents of change, or at least one more school available to give the discussion on well-being and happiness (yours and the students?) is celebrated and encouraged. In this article, I intend to understand what is being built as pedagogical discourses abou…
Sicilia. Il ricorso alle ordinanze contingibili e urgenti per ostacolare le politiche di accoglienza e integrazione sociale dei migranti: il sistema …
2019
Il lavoro si propone di esaminare il sistema di governance multi-level (Prefetto-Sindaco9 indispensabile per prevenire l'adozione di ordinanze d'urgenza lesive dei diritti fondamentali dei cittadini e dei migranti.