Search results for " order"

Donor–anion interactions at the charge localization and charge ordering transitions of (TMTTF)2AsF6 probed by NEXAFS

2015

High-resolution near-edge X-ray absorption fine structure (NEXAFS) measurements at the As M-edge, F K-edge and S L-edge of the Fabre salt (TMTTF)2AsF6 were performed from room temperature (RT) to 90 K, allowing to reach the charge localization regime below Tρ ≈ 230 K and to cross the charge ordering (CO) transition at TCO ≈ 102 K. The F K-edge and S L-edge spectra exhibit several transitions which have been indexed on the basis of first-principles DFT calculations. Upon cooling from RT significant energy shifts up to +0.8 eV and -0.4 eV were observed in transitions exhibited by the F 1s and S 2p spectra respectively, while the As 3p doublet does not show a significant shift. Opposite energy…

Theoretical and Experimental Studies of Charge Ordering in CaFeO 3 and SrFeO 3 Crystals

2021

Generalized transport coefficients in a gas with large shear rate

1987

We get a solution of the Bhatnagar-Gross-Krook (BGK) model kinetic equation by means of a perturbative expansion of a temperature gradient to study the transport properties in a gas with large shear rate. The irreversible fluxes are evaluated exactly to first order in the expansion for Maxwell molecules. The transport coefficients obtained are highly nonlinear functions of the shear rate. This dependence on shear rate is analysed and compared with previous results for several transport coefficients. Finally, we have found a solution for a simple model of constant collision frequency for which a large shear rate coexists with an arbitrary temperature gradient.

On a topological interpretation of electronic and vibrational molecular energies

1998

Abstract A relationship between Randic's connectivity index and various quantum mechanical parameters derived from the Huckel Molecular Orbital (HMO) approach is demonstrated. When applied to conjugated hydrocarbons, this index represents the measure of the global π electron molecular energy and, therefore, of the resonance energy. Moreover, the development of the procedure, allows the introduction of a new definition of the bond order which, in turn, makes possible a better prediction not only for bond lengths of naphtalene but also for the resonance integral and conjugation energy for butadiene. Also, a corrected value for the Randic index is deduced, which allows for the reduction of the…

GUARINO GUARINI E LA CHIESA DEI PADRI SOMASCHI A MESSINA

2016

Il progetto di Guarino Guarini per la chiesa dei Padri Somaschi di Messina costituisce uno dei problemi aperti della letteratura storiografica dedicata al celebre architetto modenese. La sua mancata realizzazione e, al contempo, le sue connotazioni ritenute ricorrentemente troppo “mature” per la fase iniziale della sua carriera, svoltasi a Messina negli anni 1657- 1662, hanno infatti indotto a sostanziali incertezze sulla sua collocazione cronologia e quindi sul suo effettivo ruolo nella concatenazione delle esperienze progettuali di Guarini, in merito soprattutto alla messa a punto delle sue singolari cupole a fasce incrociate. Questo contributo propone un risposta a tali irrisolte questio…

Russian concept of the Eurasian Aerospace Defense System. Analysis of the problem

2018

The author of the article describes the most important theses of A. Podberezkin plan against the geopolitical Russia background which form a paradigm of a common security in Russian terms on a strategic area of Eurasia. It is of a particular significance in view of the growing threats to modern world. Especially of hazardous nature is current problem of North Korea in connection with nuclear testing carried out by unpredictable regime of Kim Jong-un which creates the risk that sudden conflict can drag the whole Peninsula into a war. This, in turn, would lead to the US intervention there. Effects of the possible conflict involving superpower are hard to predict. Another current problem is Mo…

Word order and emergence of meaning in French and Chinese

2022

French and Chinese, both geographically and linguistically classified, are two languages that are far apart and show different language tendencies. According to G. Guillaume, Chinese is a ‘character language’ and French is a ‘word language’. Xu Tongqiang considers Chinese to be a ‘language with a semantic dimension’ and the Indo-European ‘languages are languages with a syntactic-morphological dimension’. According to us, it is assumed that Chinese is a ‘semantically oriented language’ while French is a “syntactically oriented language”. Faced with this typological difference, we consider that the basic level in Chinese grammatical analysis is based on a relative dualism 'characters-words' a…

The Structure of Cholesterol in Lipid Rafts

2014

Rafts, or functional domains, are transient nano- or mesoscopic structures in the plasma membrane and are thought to be essential for many cellular processes such as signal transduction, adhesion, trafficking and lipid/protein sorting. Observations of these membrane heterogeneities have proven challenging, as they are thought to be both small and short-lived. With a combination of coarse-grained molecular dynamics simulations and neutron diffraction using deuterium labeled cholesterol molecules we observe raft-like structures and determine the ordering of the cholesterol molecules in binary cholesterol-containing lipid membranes. From coarse-grained computer simulations, heterogenous membra…

Sodium Congener of the Classical Lithium Methylchromate Dimer: Synthetic, X-ray Crystallographic, and Magnetic Studies of Me8Cr2[Na(OEt2)]4

2011

One of the milestone structures in the development of transition-metal complexes with metal metal bonds of multiple bond order was the lithium methylchromate dimer Me8Cr2[Li(donor)](4) (donor = THF or Et2O). Using a simple salt metathesis reaction mixing this compound with sodium tert-butoxide, the sodium congener Me8Cr2-[Na(OEt2)]4 has been synthesized as a green crystalline compound and isolated in 51% yield. Its solid-state structure was determined by single-crystal X-ray diffraction. Exhibiting exact crystallographic C-4h symmetry, this heavier alkali-metal chromate structure is also dimeric, formally comprising a (Me8Cr4)(4-) tetranionic core with four peripheral Na+ cations carrying s…

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…