Search results for " material"
showing 10 items of 17428 documents
Methyl 3',4',5'-trimethoxybiphenyl-4-carboxylate
2013
In the title compound, C17H18O5, the dihedral angle between the benzene rings is 31.23 (16)°. In the crystal, the molecules are packed in an antiparallel fashion in layers along the a axis. In each layer, very weak C-H...O hydrogen bonds occur between the methoxy and methyl ester groups. Weak C-H...[pi] interactions between the 4'- and 5'-methoxy groups and neighbouring benzene rings [methoxy-C-ring centroid distances = 4.075 and 3.486 Å, respectively] connect the layers.
1,1,4,4-Tetramethylpiperazinediium dibromide
2009
A small quantity of the title compound, C8H20N22+·2Br−, was formed as a by-product in a reaction between a diamine and an alkyl bromide. The asymmetric unit contains half of a centrosymmetric dication and a bromide anion. In the crystal, weak intermolecular C—H...Br hydrogen bonds consolidate the crystal packing.
Harnessing Molecular Fluorophores in the Carbon Dots Matrix: The Case of Safranin O
2022
The origin of fluorescence in carbon dots (C-dots) is still a puzzling phenomenon. The emission is, in most of the cases, due to molecular fluorophores formed in situ during the synthesis. The carbonization during C-dots processing does not allow, however, a fine control of the properties and makes finding the source of the fluorescence a challenging task. In this work, we present a strategy to embed a pre-formed fluorescent molecule, safranin O dye, into an amorphous carbonaceous dot obtained by citric acid carbonization. The dye is introduced in the melted solution of citric acid and after pyrolysis remains incorporated in a carbonaceous matrix to form red-emitting C-dots that are strongl…
Controlling the crystal growth of potassium iodide with a 1,1'-bis(pyridin-4-ylmethyl)-2,2'-biimidazole ligand (L) – formation of a linear [K4I4L4]n …
2018
The crystal growth of potassium iodide was controlled by using the neutral organic 1,1′-bis(pyridin-4-ylmethyl)-2,2′-biimidazole (L) ligand as a modifier. The selected modifier allows the preservation of original cubic [K4I4] units and their arrangement into a linear ligand-supported 1D chain. The supported [K4I4] cubes are only slightly distorted compared to the cubes found in pure KI salt. The N–K binding of the ligand to the KI salt, as well as weak I⋯H, N⋯H, and N⋯I interactions, stabilizes the structure to create a unique 1D polymer of neutral potassium iodide ionic salt inside the [K4I4L4]n complex.
University, Health and Society. Materials docents
2018
El document forma part dels materials docents programats mitjançant l'ajut del Servei de Política Lingüística de la Universitat de València Teaching materials for the subject "University, Health, Society", in the curriculum of the grade of Medicine. It includes the Syllabus or teaching programme, Slides of the power point presentation, materials for the practical activities, and complementary information. Teaching materials for the subject "University, Health, Society", in the curriculum of the grade of Medicine. It includes the Syllabus or teaching programme, Slides of the power point presentation, materials for the practical activities, and complementary information.
Nonlinear Absorption and Refraction of Picosecond and Femtosecond Pulses in HgTe Quantum Dot Films
2021
We report measurements of the saturated intensities, saturable absorption, and nonlinear refraction in 70-nm thick films containing 4 nm HgTe quantum dots. We demonstrate strong nonlinear refraction and saturable absorption in the thin films using tunable picosecond and femtosecond pulses. Studies were carried out using tunable laser pulses in the range of 400–1100 nm. A significant variation of the nonlinear refraction along this spectral range was demonstrated. The maximal values of the nonlinear absorption coefficients and nonlinear refractive indices determined within the studied wavelength range were −2.4 × 10−5 cm2 W−1 (in the case of 28 ps, 700 nm probe pulses) and −3 × 10−9 cm2 W−1 …
"Write in English on your notebook" : analysis of creative writing exercises in a Finnish EFL workbook
2016
Vaikka luovalla kirjoittamisella on tutkittu olevan paljon etuja vieraan ja toisen kielen oppimisessa, Perusopetuksen opetussuunnitelman perusteet (2004) ei tarjoa täsmällisiä ohjeita luovan kirjoittamisen opetukseen englannin kielen oppiaineessa. Täten luovan kirjoittamisen tehtävien suunnittelu on opettajien ja oppimateriaalien valmistajien vastuulla. Oppikirjat ovat edelleen hyvin laajasti käytettyjä oppimateriaaleja, joten niiden tutkiminen tarjoaa tietoa myös opetuksesta yleensä. Tutkielman päämääränä on selvittää luovan kirjoittamisen tehtävien esiintymistä yhdessä suomalaisessa englannin kielen tehtäväkirjassa. Tätä tutkittiin kahden tutkimuskysymyksen avulla, joista ensimmäinen kosk…
English teachers' perception of the purpose of a CD connected to English textbooks
2009
Vieraan kielen opiskelussa ja opettamisessa on käytetty pitkään apuvälineinä erilaisia äänitteitä. Kuitenkin vasta lähiaikoina äänitteitä on alettu käyttää myös luokkahuoneen ulkopuolella. Nykyisin monissa suomalaisissa peruskouluissa käytetään englannin kielen oppikirjoja, joissa tulee mukana myös oppilaan CD. Tämä CD on tarkoitettu oppilaan itsenäiseen käyttöön tukemaan vieraan kielen opiskelua kotona. Koska CD:n käyttö on vielä uutta, ei sitä ole tutkittukaan. Aikaisemmat tutkimukset vieraan kielen kuuntelemisesta keskittyvät lähinnä luokkahuonetilanteisiin. Vain muutama aikaisempi tutkimus mainitsee lyhyesti itsenäisen kuuntelun tärkeydestä. Siksi onkin tärkeää tutkia, mikä rooli tällä…
Influence of a Thiolate Chemical Layer on GaAs (100) Biofunctionalization: An Original Approach Coupling Atomic Force Microscopy and Mass Spectrometr…
2013
International audience; Widely used in microelectronics and optoelectronics; Gallium Arsenide (GaAs) is a III-V crystal with several interesting properties for microsystem and biosensor applications. Among these; its piezoelectric properties and the ability to directly biofunctionalize the bare surface, offer an opportunity to combine a highly sensitive transducer with a specific bio-interface; which are the two essential parts of a biosensor. To optimize the biorecognition part; it is necessary to control protein coverage and the binding affinity of the protein layer on the GaAs surface. In this paper; we investigate the potential of a specific chemical interface composed of thiolate molec…
¿Quién está buscando su mejor versión? Coaching y psicología deportiva en el proceso de terapeutización de (y desde) el golf
2020
This article asks about the expansion of psychological, therapeutic and self-enhancement ethos through the networks and devices that configures middle and upper-middle classes, and about the ways in which this process is singled out starting from the encounter between coaching and psychology paradigms with golf fans, in contemporary Argentina. The empirical materials that support the analysis have been ethnographically produced from the interaction with golf players and coaches.