Search results for "material"
showing 10 items of 32550 documents
Observation of the Early Structural Changes Leading to the Formation of Protein Superstructures.
2014
Formation of superstructures in protein aggregation processes has been indicated as a general pathway for several proteins, possibly playing a role in human pathologies. There is a severe lack of knowledge on the origin of such species in terms of both mechanisms of formation and structural features. We use equine lysozyme as a model protein, and by combining spectroscopic techniques and microscopy with X-ray fiber diffraction and ab initio modeling of Small Angle X-ray Scattering data, we isolate the partially unfolded state from which one of these superstructures (i.e., particulate) originates. We reveal the low-resolution structure of the unfolded state and its mechanism of formation, hi…
Influence of uniaxial pressure on dielectric properties of (1- x )Na 0.5 Bi 0.5 TiO 3– x SrTiO 3 for x = 0.01, 0.04, and 0.1 ceramics
2017
The publication costs of this article were covered by the Estonian Academy of Sciences and the University of Tartu.
A new forum for upconversion research: The UPCON conference
2019
International audience; The Conference and Spring School on Properties, Design and Applications of Upconversion Nanomaterials (UPCON) provides a new forum for all experts and newcomers in the field of upconversion research. On the occasion of the second UPCON 2018 in Valencia (Spain), we are pleased to present a collection of 12 reviews and research articles that reflect recent advances in upconversion materials, their unique luminescent properties and many applications spanning from nanoscale thermometry to biomedicine.
Dual Enzyme-Triggered Controlled Release on Capped Nanometric Silica Mesoporous Supports
2012
The development of nanoscopic hybrid materials equipped with “molecular gates” showing the ability of releasing target entrapped guests upon the application of an external trigger has attracted great attention and has been extensively explored during recent years.1 These nanodevices are composed of two subunits, namely, a suitable support and certain capping entities grafted on the surface of the scaffolding.2 The support is used as a suitable reservoir in which certain chemicals can be stored whereas the molecules grafted in the outer surface act as a “gate” and can control the release of the entrapped molecules at will. Both components are carefully selected and arranged in order to achie…
Teaching and Learning of Geometry as a process of Objectification: conditions and obstacles to argumentation and proof. The role of natural language,…
2021
This paper examines some examples (taken from research conducted over the years) that show students’ linguistic attitudes in geometry tasks. The examples are framed within the Theory of Objectification with reference to the notion of sensuous cognition, semiotic means of objectification and levels of generality. We show the struggle students live, at higher levels of generality, in intertwining natural language, specific language and the spontaneous use of geometrical figures, bound to perception and kinaesthetic activity. Within the networking paradigm, we coordinate the Theory of Objectification and Duval’s semio-cognitive approach to frame the interplay between the ideal and the material…
Uttalsundervisning i läroboksserien Galleris digitala undervisningsmaterial
2014
Tutkielmani tarkoituksena oli selvittää ääntämisen opetusta ruotsin kielen oppikirjasarja Gallerin sähköisessä materiaalissa. Materiaali koostui lukion B-ruotsin kolmesta ensimmäisestä digitaalisesta oppikirjasta, kappalekohtaisesta sähköisestä materiaalista opettajalähtöiseen opetukseen sekä opettajan lisämateriaalista. Tarkastelin tutkimuksessani näiden materiaalien ääntämistä koskevaa sisältöä. Tutkimukseni on sisällönanalyysi, jonka avulla pyrin mahdollisimman objektiivisesti kuvaamaan oppimateriaalin sisältöä. Pyrin ottamaan selville mitkä seikat ovat keskeisiä ääntämisen opetuksessa, mitkä asiat katsotaan tärkeäksi oppia, kuinka suomen ja ruotsin välisiä eroja selitetään sekä kuinka p…
Diplomatic Wives, Cultures of Dress, and Brita Kekkonen : The New Study on the Cultural History of Diplomacy Has Started
2021
In this article, I discuss the private dress collection of Brita Kekkonen (1927–2013), a diplomatic wife, who was a very well-known figure in Finland during the period of the Cold War. Brita Kekkonen was also a very talented dress-maker and a very fashionable figure in diplomatic circles. Some eighty outfits made by Brita Kekkonen have survived to this day, in addition to her volumi-nous pattern collection, containing more than 1,000 patterns from several decades. The aim of my new postdoctoral research project is to identify Bri-ta Kekkonen’s dresses and examine their use, politico-cultural meanings and design in the context of the Cold War, diplomatic etiquette and Kekkonen’s own personal…
Resilience and the Aging Process: Assessment Tools and Needs
2015
Abstract Successful resilience is a variable often related to an optimal aging process and that might have a role on education. However, literature is rather limited when dealing with assessment instruments for the elderly in the Spanish language. The objective of this work is to examine the Brief Resilient Coping Scale (Sinclair &Wallston, 2004), a four item likert scale, in the Spanish elderly. This scale was administrated to a sample of 920 elderly Spanish participants, and the data set analysed in terms of exploratory and confirmatory factor analysis and internal consistency. The scale demonstrated good psychometric properties. Furthermore, the homogeneity indices were higher than in th…
Adaptación al Espacio Europeo de Educación Superior de un cuestionario de opinión del alumnado sobre la docencia de su profesorado
2014
El objetivo de este trabajo es presentar el proceso de adaptación al Espacio Europeo de Educación Superior del cuestionario de opinión del alumnado sobre la docencia de su profesorado que se ha seguido en la Universidad del País Vasco. En este proceso se ha adoptado una metodología mixta. Tras efectuar la revisión de los cuestionarios de otras universidades, teniendo en cuenta el marco teórico del nuevo cuestionario, las competencias transversales adoptadas por la Universidad y las tres dimensiones que señala la ANECA, se redactaron una serie de indicadores y posibles ítems susceptibles de conformar el nuevo cuestionario. Este marco teórico, los indicadores e ítems fueron contrastados en di…
Analysis of requirements for valve accuracy and repeatability in high efficiency digital displacement motors
2018
Traditional variable displacement piston machines achieve high efficiency when operating at high displacements, but struggle with poor efficiency at low displacements. The pistons are connected to high pressure and low pressure in conjunction with the output shaft position and the displacement is changed by changing the piston stroke, resulting in almost constant friction, leakage, and compressibility losses independent of displacement. In digital displacement machines, the rotary valve is replaced by two fast switching on/off valves connected to every cylinder. By controlling the fast switching on/off valves, the cylinders can be controlled individually and friction, leakage and compressib…