Search results for "solid"

Exchange coupling in the correlated electronic states of amorphous GdFe films

2013

The bulk sensitivity of hard x-ray photoelectron spectroscopy in combination with circularly polarized radiation of the P09 beamline at PETRA III enables the investigation of the magnetic properties of capped films. We have determined the temperature dependence of the magnetic circular dichroism in the Fe 2$p$ and in the Gd 3$d$ states in amorphous GdFe films. The magnetic dichroism reflects the stronger temperature dependence of Gd moments compared to Fe moments in agreement with mean-field models. We resolved the exchange split Gd 3${d}_{5/2}$ substates and found a significant temperature dependence of the splitting which is attributed to a temperature dependent part of the exchange energ…

Genotoxicity of citrus wastewater in prokaryotic and eukaryotic cells and efficiency of heterogeneous photocatalysis by TiO(2).

2012

Abstract The presence of (±)α-pinene, (+)β-pinene, (+)3-carene, and R-(+)limonene terpenes in wastewater of a citrus transformation factory was detected and analyzed, in a previous study, by using Solid Phase Micro-extraction (SPME) followed by GC analyses. Purpose of that research was to compare the genotoxic responses of mixtures of terpenes with the genotoxicity of the individual compounds, and the biological effects of actual wastewater. Genotoxicity was evaluated in the Salmonella reversion assay (Ames test) and in V79 cells by Comet assay. Ames tests indicated that the four single terpenes did not induce an increase of revertants frequency. On the contrary, the mixtures of terpenes ca…

Institutions, crises, and political confidence in seven contemporary democracies. An elite-mass analysis

2017

There is ample consensus in the literature that institutional confidence by the public is needed in democracies and at the same time elites, particularly political elites, need to share this confidence in their guidance of state institutions, if political stability in established democracies and the consolidation of new democracies are desired. The research takes the form of a quantitative analysis based on the World Values Surveys and the elite surveys (parliamentarians) conducted in 2006 (before the financial crisis) and in 2012–2013 (post the crisis when apparently, the worst of the economic crunch had lessened up) in the 7 countries selected. We explore what lies at the base of politica…

Conversion as Negotiation. Converts as Actors of Civil Society

2020

This article focuses on the religious movement of the Ahmadiyya and its civil society organization, Humanity First, in West-Africa and in Europe. Particular attention is paid to the place of converts within these two institutions. Conversions to an Islamic minority and the actions of this minority are studied through the prism of social commitment. I examine the intersections between religious values, the ideas of solidarity in the societies under scrutiny and, the kaleidoscopic range of Muslim charities. The paper investigates conversion as negotiation in regard to gender, social mobility, and power. Conversion is approached here as a matter of social relations and not personal belief. I a…

Rational Foundations of Democratic Politics

2003

1. Introduction Albert Breton, Gianluigi Galeotti, Pierre Salmon and Ronald Wintrobe Part I. Some Problems with Democratic Institutions and Trends in Their Evolution: 2. Demobilization, demoralization and the loosening bonds of electoral politics Michael C. Munger 3. Turning 'citizens' into 'consumers': economic growth and the level of public discourse Stergios Skaperdas 4. Economic and cultural prerequisites for democracy Roger D. Congleton 5. Civil society and the contemporary social order Frederique Chaumont-Chancelier Part II. Morals in Politics: 6. When does altruism overcome the intransitivity of income redistribution? Donald Wittman 7. Democratic resilience and the necessity of virtu…

The durability of basalt fibres reinforced polymer (BFRP) panels for cladding

2015

The study focuses on two basalt composite laminate panels for cladding, produced by means of vacuum bagging technique. In particular, unidirectional and random basalt fabrics, with different areal weights, using epoxy resin as matrix, were used. According to the ISO 15686 methodology for the evaluation of durability, samples were subjected to cycles of artificial aging in climatic chamber and outdoor exposure, carrying out mechanical (i.e. quasi-static and dynamic) and calorimetric tests. The results show the effectiveness over time of produced basalt composite laminates and the initial increase of the mechanical performances after the first steps of accelerated aging.

ChemInform Abstract: Pillar[n]arenes - A Novel, Highly Promising Class of Macrocyclic Host Molecules

2014

Review: [preparation, structure in solution and in the solid state and complexation; 100 refs.

Indefinitely stable iron(IV) cage complexes formed in water by air oxidation

2017

In nature, iron, the fourth most abundant element of the Earth's crust, occurs in its stable forms either as the native metal or in its compounds in the +2 or +3 (low-valent) oxidation states. High-valent iron (+4, +5, +6) compounds are not formed spontaneously at ambient conditions, and the ones obtained synthetically appear to be unstable in polar organic solvents, especially aqueous solutions, and this is what limits their studies and use. Here we describe unprecedented iron(IV) hexahydrazide clathrochelate complexes that are assembled in alkaline aqueous media from iron(III) salts, oxalodihydrazide and formaldehyde in the course of a metal-templated reaction accompanied by air oxidation…

Contrat de maîtrise d'œuvre : revirement sur l'efficacité des clauses d'exclusion de l'obligation in solidum

2022

Joining by forming technologies: current solutions and future trends

2022

AbstractThe progressively more demanding needs of emissions and costs reduction in the transportation industry are pushing engineers towards the use of increasingly lightweight structures. This goal can be achieved only if dissimilar and/or new materials, including polymers and composites, are joined together to create complex structures. Conventional fusion welding processes have often been proven inadequate to this task because of the high heat input reducing the joint mechanical properties or even making the joining process impossible. Joining by forming technologies take advantage on the plastic deformation to create sound joints out of even very dissimilar materials. Over the last 25 y…