Search results for " materia"
showing 10 items of 18071 documents
I MATERIALI LAPIDEI NELLA TRADIZIONE COSTRUTTIVA SICILIANA: LE PIETRE DELLA PIANA DI BAGHERIA
2007
Il contributo descrive gli studi effettuati sulle cave storiche nella piana di Bagheria
Engineering new tools for automated fabrication of molecular thin films and study of their electrical properties
2019
Resumen en castellano El propósito de esta tesis, titulada “Ingeniería de nuevas herramientas para la automatización. Fabricación de películas delgadas moleculares y Estudio de sus propiedades eléctricas”, es el desarrollo de algunas plataformas faltantes en el Instituto de Ciencia Molecular (ICMol) para llevar acabo el estudio de propiedades eléctricas de materiales moleculares e integrarlos en dispositivos electrónicos. Los objetivos específicos son: i) la nanoestructuración de materiales moleculares novedosos como los polipéptidos, las redes metal orgánicas bidimensionales (2D MOFs, two dimentional metal organic frameworks), polímeros de coordinación que presenten bi-estabilidad de espín…
Lukion historian opettajien käsityksiä esseen arviointiin vaikuttavista piirteistä
2021
Artikkelissa tarkastellaan lukion historian opettajien käsityksiä aineistopohjaisen esseen arvioinnista ja siihen vaikuttavista piirteistä tiedonalan tekstitaitojen näkökulmasta. Aineisto koostuu opettajien ryhmähaastatteluista ja lukiolaisten kirjoittamista aineistopohjaisista esseistä. Haastattelut analysoitiin laadullisen sisällönanalyysin avulla ja esseiden kielellisiä piirteitä systeemis-funktionaalisen kieliteorian avulla. Analyysissä keskityttiin opettajien arvostamiin esseen piirteisiin ja niiden kielellisiin toteumiin. Opettajien arvostamissa piirteissä korostuivat erityisesti sisältötiedon hallinta sekä tehtävänannon noudattaminen. Aineiston käyttöön ja opiskelijan omaan pohdintaa…
Indistinguishability of Elementary Systems as a Resource for Quantum Information Processing.
2017
Typical elements of quantum networks are made by identical systems, which are the basic particles constituting a resource for quantum information processing. Whether the indistinguishability due to particle identity is an exploitable quantum resource remains an open issue. Here we study independently prepared identical particles showing that, when they spatially overlap, an operational entanglement exists which can be made manifest by means of separated localized measurements. We prove this entanglement is physical in that it can be directly exploited to activate quantum information protocols, such as teleportation. These results establish that particle indistinguishability is a utilizable …
Atbalsta pasākumi logopēda darbībā otrās klases skolēniem ar mācīšanās traucējumiem
2019
Maģistra darba nosaukums: “Atbalsta pasākumi logopēda darbībā otrās klases skolēniem ar mācīšanās traucējumiem” Darba autore: Dace Riekstiņa Darba vadītāja: Ilze Vilka Darba saturs: Maģistra darbs sastāv no 166 lappusēm, 49 attēliem un 23 pielikumiem. Pētījuma mērķis: Teorētiski izpētīt un empīriski pārbaudīt metodiskā materiāla “Tematiskais plāns VSNA mazināšanai otrajai klasei” izmantošanas lietderīgums sākumskolas vecuma skolēniem ar VSNA Pētījuma jautājums: Vai skolēniem veiksmīgāk uzlabosies valodas sistēmas attīstība, ja koriģējoši attīstošā darbībā tiks izmantots metodiskais materiāls “Tematiskais plāns ar uzdevumiem”? Pētījuma teorētiskajā daļā maģistra darba autore pētījusi un anal…
High-Performance Lead-Acid Batteries Enabled by Pb and PbO2 Nanostructured Electrodes: Effect of Operating Temperature
2021
Lead-acid batteries are now widely used for energy storage, as result of an established and reliable technology. In the last decade, several studies have been carried out to improve the performance of this type of batteries, with the main objective to replace the conventional plates with innovative electrodes with improved stability, increased capacity and a larger active surface. Such studies ultimately aim to improve the kinetics of electrochemical conversion reactions at the electrode-solution interface and to guarantee a good electrical continuity during the repeated charge/discharge cycles. To achieve these objectives, our contribution focuses on the employment of nanostructured electr…
Thermo-Mechanical Behaviour of Flax-Fibre Reinforced Epoxy Laminates for Industrial Applications
2015
The present work describes the experimental mechanical characterisation of a natural flax fibre reinforced epoxy polymer composite. A commercial plain woven quasi-unidirectional flax fabric with spun-twisted yarns is employed in particular, as well as unidirectional composite panels manufactured with three techniques: hand-lay-up, vacuum bagging and resin infusion. The stiffness and strength behaviours are investigated under both monotonic and low-cycle fatigue loadings. The analysed material has, in particular, shown a typical bilinear behaviour under pure traction, with a knee yield point occurring at a rather low stress value, after which the material tensile stiffness is significantly r…
Effect of NaOH Treatment on Properties of Phoenix Sp. Fiber
2016
The aim of this paper is to investigate the effect of an alkali treatment on physical, chemical, mechanical, and morphological properties of Phoenix Sp. fibers. The use of natural fibers as reinforcement in polymer composites requires a deep investigation to understand their behavior and which treatment is more appropriate to improve the quality of the untreated material. For this reason, fibers were extracted from the petioles of the Phoenix Sp. plant and they were treated with NaOH solution in different weight concentrations (5%, 10%, and 15%). The mechanical behavior was investigated through tensile test on single fiber at different gauge length (20 mm, 30 mm, 40 mm, 50 mm, and 60 mm). C…
Effect of Core–Shell Rubber Nanoparticles on the Mechanical Properties of Epoxy and Epoxy-Based CFRP
2022
This research was funded by M-Era.Net project MERF “Matrix for carbon reinforced epoxy laminates with reduced flammability” grant No. 1.1.1.5/ERANET/20/04 from the Latvian State Education Development Agency and M-Era.Net project “EPIC—European Partnership for Improved Composites“ funded by grant No. TH06020001. A.S., K.S. and A.Z. are grateful to funding received from the European Union Horizon 2020 Framework program H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART2.