Search results for " direct method"

showing 3 items of 3 documents

Atomic structure solution of the complex quasicrystal approximant Al77Rh15Ru8 from electron diffraction data

2014

The crystal structure of the novel Al77Rh15Ru8phase (which is an approximant of decagonal quasicrystals) was determined using modern direct methods (MDM) applied to automated electron diffraction tomography (ADT) data. The Al77Rh15Ru8E-phase is orthorhombic [Pbma,a= 23.40 (5),b= 16.20 (4) andc= 20.00 (5) Å] and has one of the most complicated intermetallic structures solved solely by electron diffraction methods. Its structural model consists of 78 unique atomic positions in the unit cell (19 Rh/Ru and 59 Al). Precession electron diffraction (PED) patterns and high-resolution electron microscopy (HRTEM) images were used for the validation of the proposed atomic model. The structure of the E…

ChemistryMetals and AlloysQuasicrystalCrystal structureelectron diffraction tomography; icosahedral and decagonal quasicrystals; modern direct methodsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsCrystallographyElectron diffractionmodern direct methodsMaterials ChemistryAtomic modelicosahedral and decagonal quasicrystalsPrecession electron diffractionOrthorhombic crystal systemelectron diffraction tomographyHigh-resolution transmission electron microscopyElectron backscatter diffraction
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Application of delta recycling to electron automated diffraction tomography data from inorganic crystalline nanovolumes

2013

δ Recycling is a simple procedure for directly extracting phase information from Patterson-type functions [Rius (2012). Acta Cryst. A68, 399-400]. This new phasing method has a clear theoretical basis and was developed with ideal single-crystal X-ray diffraction data. On the other hand, introduction of the automated diffraction tomography (ADT) technique has represented a significant advance in electron diffraction data collection [Kolb et al. (2007). Ultramicroscopy, 107, 507-513]. When combined with precession electron diffraction, it delivers quasi-kinematical intensity data even for complex inorganic compounds, so that single-crystal diffraction data of nanometric volumes are now availa…

Diffraction[delta] recycling; direct methods; structure solution; electron diffraction; automated diffraction tomography; nano electron diffraction; precession electron diffraction; nanocrystals.Reflection high-energy electron diffractionMaterials scienceGas electron diffractionAnalytical chemistrydirect methodsDiffraction tomographyprecession electron diffractionElectron diffractionnanocrystalsStructural BiologyDirect methodsstructure solutionautomated diffraction tomographynano electron diffractionPrecession electron diffractionelectron diffractionElectron backscatter diffraction[delta] recycling
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Le manuel Corso di Lingua francese a base intuitiva de Romeo Lovera

2020

We analyze the three volumes of Romeo Lovera’s manual, Corso di Lingua francese a base intuitiva, which were intended for teaching French in secondary schools. The manual was first published in 1902 in Venice by Libreria editrice del Bollettino di Filologia Moderna, and there will be many reissues. Romeo Lovera is Italy's biggest supporter of methodological reform in the teaching of foreign languages ; it discloses, through the Bollettino di Filologia Moderna, new theories, scientific methods and their didactic applications. In their manuals, from the first lesson, through the direct and indirect intuition of the foreign language, the student learns to speak the French language by studying …

Romeo Loveraenseignement de la langue françaiseFrench language teaching Corso di Lingua francese a base intuitiva direct method intuitive method Romeo Lovera.enseignement de la langue française Corso di Lingua francese a base intuitiva méthode directe méthode intuitive Romeo Lovera.Settore L-LIN/04 - Lingua E Traduzione - Lingua Franceseméthode directedirect methodCorso di Lingua francese a base intuitivaFrench language teachingintuitive methodméthode intuitive
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