Search results for "visual"
showing 10 items of 7386 documents
Syntheses and Structural Study of Novel Tetranuclear Bis(phenoxido)‐Bridged Cu II Metal–Organic Macrocycles
2012
Six new tetranuclear copper(II) complexes were prepared exploiting novel ditopic alkylenediamine-N,N,N′,N′-tetraphenolate ligands. The geometrical parameters of the compounds can be varied by introducing different solvents of crystallization into the lattice. The structures of all six complexes were determined from single-crystal X-ray diffraction analyses and the magnetic properties of the complexes were estimated by computational DFT calculations. The relationship between the magnetic exchange coupling constant (J) and the Cu–O–Cu angle (θ) in these bis(phenoxido)-bridged complexes was investigated and a magnetostructural correlation was established between J and the θ angle. All studied …
Hot electron effects in metallic single electron components
1996
Thermalisation of single electron devices is of considerable current interest because of its fundamental and practical consequences. We present experimental evidence of the effect of electrode volume and its shape on thermal equilibration of small metallic islands for single electron tunnelling. Heat transport between the conduction electrons and the lattice in a metal is commonly accepted to obey the ∝Te5-T0/5 law at low electron and lattice temperatures,Te andT0, respectively. We have investigated the power law and found that it obeys the ∝T5 law only for the smallest islands, and in the majority of the cases considered, it rather follows a law ∝Tp, wherep<5. The thermal coupling can be i…
Single and Twofold Metal- and Reagent-Free Anodic C-C Cross-Coupling of Phenols with Thiophenes.
2017
The first electrochemical dehydrogenative C-C cross-coupling of thiophenes with phenols has been realized. This sustainable and very simple to perform anodic coupling reaction enables access to two classes of compounds of significant interest. The scope for electrochemical C-H-activating cross-coupling reactions was expanded to sulfur heterocycles. Previously, only various benzoid aromatic systems could be converted, while the application of heterocycles was not successful in the electrochemical C-H-activating cross-coupling reaction. Here, reagent- and metal-free reaction conditions offer a sustainable electrochemical pathway that provides an attractive synthetic method to a broad variety …
Ferromagnetic Coupling through Spin Polarization in a Dinuclear Copper(II) Metallacyclophane.
2001
[DT] Von organischen Radikalen zu Metallkomplexen konnte das bekannte Konzept für Ferroelektrika erfolgreich ausgedehnt werden: Die Abbildung zeigt ein Cyclophan-artiges Molekül mit einem Triplett-Grundzustand, in dem zwei CuII-Zentren von einem doppelten m-Phenylendiamid-Gerüst zusammengehalten werden.
Las reivindicaciones del profesorado de Educación Artística ante los nuevos obstáculos curriculares; el proyecto “Second Round: Art i Lluita a Secund…
2016
Resumen : En este articulo se estudia la situacion precaria en la que se encuentra la Educacion Artistica en los niveles no universitarios dentro el ambito espanol, realidad que contrasta con el auge que esta tomando nuestra especialidad en el conjunto de paises de Latinoamerica. La Ley Organica 8/2013, de 9 de diciembre, para la mejora de la calidad educativa (LOMCE) nos relega a la mera optatividaden educacion secundaria, teniendo en cuenta que en primaria nunca existio la figura del maestro especialista en artes visuales. Frente a ello, iniciativas recientes vienen a reivindicar la importancia la Educacion Artistica en la etapa de secundaria. Sirva como ejemplo el proyecto “Second Round:…
Fatigue Crack Growth for Different Ratios of Bending to Torsion in AlCu4Mg1
2008
The paper contains the fatigue crack growth test results obtained under proportional bending with torsion in AlCu4Mg1 aluminium alloy [1]. Specimens with rectangular cross sections and dimensions: length l = 90 mm, height w = 10 mm and thickness g = 8 mm were tested [2]. Each specimen had an external unilateral notch with depth 2 mm and radius ρ = 0.2 mm. The tests were performed under the stress ratio R = −1. The notches in the specimens were cut with a milling cutter and their surfaces were polished after grinding. The tests were realized on a fatigue test stand MZGS-100 where the ratio of torsion moment to bending moment was \( M_T (t)/M_B (t) = tg\alpha = \sqrt 3 /3,1{\text{ }}and\sqrt …
Le monastère Saint-Pierre d'Osor (île de Cres) : septième campagne d'études archéologiques
2013
The 2012 campaign of the archaeological research project permitted the exhaustive excavations of the immediate surroundings of the southern nave of the abbey church of St Peter in Osor. The richness and the complexity of the discovered structures confirmed the great archaeological potential of this sector. Namely, a funeral zone that is situated south to the church is occupied by two buildings perpendicular to the church which we interpret as a mausoleum (the one on the west) and a chapel with one privileged burial (the one on the east). The great number of built tombs or simples graves confirmed that this sector had funeral function even before the XIth century and the construction of the …
Esquisse d'un paysage monastique insulaire dans le nord de l'Adriatique : l'archipel du Kvarner (Croatie)
2013
The authors of the article set as their goal the examination of the complex question of early Monasticism (up to the 11th century) in the Kvarner region, reconsidering the old archaeological data, the unpublished ancient results and the results of new archaeological surveys gathered since 2010 through the specific research program. The first difficulty encountered is that of the actual identification of the archaeological remains as a monastic or hermitic site, given the lack of any written source for most of the sites. We examine here a certain number of religious sites, potentially monastic ones, considering their larger context of implantation, their patron, and/or their vicinity to a by…
Birch (Betula spp.) wood biochar is a potential soil amendment to reduce glyphosate leaching in agricultural soils
2015
Glyphosate (N-(phosphonomethyl) glycine), a commonly used herbicide in agriculture can leach to deeper soil layers and settle in surface- and ground waters. To mitigate the leaching of pesticides and nutrients, biochar has been suggested as a potential soil amendment due to its ability to sorb both organic and inorganic substances. However, the efficiency of biochar in retaining agro-chemicals in the soil is likely to vary with feedstock material and pyrolysis conditions. A greenhouse pot experiment, mimicking a crop rotation cycle of three plant genera, was established to study the effects of pyrolysis temperature on the ability of birch (Betula sp.) wood originated biochar to reduce the l…
Poplar rotation coppice at a trace element-contaminated phytomanagement site: A 10-year study revealing biomass production, element export and impact…
2019
Abstract Growing lignocellulosic crops on marginal lands could compose a substantial proportion of future energy resources. The potential of poplar was explored, by devising a field trial of two hectares in 2007 in a metal-contaminated site to quantify the genotypic variation in the growth traits of 14 poplar genotypes grown in short-rotation coppice and to assess element transfer and export by individual genotypes. Our data led us to conclusions about the genotypic variations in poplar growth on a moderately contaminated site, with the Vesten genotype being the most productive. This genotype also accumulated the least amounts of trace elements, whereas the Trichobel genotype accumulated up…