Search results for "Negativity"

Negations and negativity as linguistic devices in policy discourse of intercultural cities

2015

International audience; Intercultural cities – a joint initiative launched in 2008 by the European Commission and the Council of Europe – aims to develop a model supporting intercultural integration within diversified urban communities. This article examines, using methods of applied linguistics and discourse analysis, how intercultural urban policy is linguistically produced in the initiative. The examination indicates that the intercultural urban policy in the initiative is ‘negative politics’: the policy rhetoric commonly outlines the content of interculturalism by describing what is not included in it and what the policy is not about. The language used in the intercultural urban policy …

La negatividad de Kant a Hegel: juicio estético y lenguaje especulativo”.

2017

Este artículo presenta una interpretación de la proposición especulativa de Hegel que, subrayando el “contragolpe” que el sujeto heredado de la tradición moderna sufre en ella, permite vincular el movimiento del sujeto hegeliano a la negatividad reconocida por Kant en el fondo de la capacidad de juzgar a propósito de la dimensión estética. De este modo se pretende, en primer lugar, cuestionar la lectura que ve en Hegel un retroceso respecto a la conciencia ganada por Kant en relación a la finitud o a la fisura constitutiva del sujeto moderno, y, en última instancia, en sintonía con relecturas recientes de Hegel como las de Žižek y Malabou, contribuir al cuestionamiento de la interpretación …

Electrophysiological evidence for change detection in speech sound patterns by anesthetized rats

2014

Human infants are able to detect changes in grammatical rules in a speech sound stream. Here, we tested whether rats have a comparable ability by using an electrophysiological measure that has been shown to reflect higher order auditory cognition even before it becomes manifested in behavioral level. Urethane-anesthetized rats were presented with a stream of sequences consisting of three pseudowords carried out at a fast pace. Frequently presented “standard” sequences had 16 variants which all had the same structure. They were occasionally replaced by acoustically novel “deviant” sequences of two different types: structurally consistent and inconsistent sequences. Two stimulus conditions we…

Understanding the Origin of the Regioselectivity in Non-polar [3+2] Cycloaddition Reactions through the Molecular Electron Density Theory

2020

The regioselectivity in non-polar [3+2] cycloaddition (32CA) reactions has been studied within the Molecular Electron Density Theory (MEDT) at the B3LYP/6-311G(d,p) level. To this end, the 32CA reactions of nine simplest three-atom-components (TACs) with 2-methylpropene were selected. The electronic structure of the reagents has been characterized through the Electron Localisation Function (ELF) and the Conceptual DFT. The energy profiles of the two regioisomeric reaction paths and ELF topology of the transition state structures are studied to understand the origin of the regioselectivity in these 32CA reactions. This MEDT study permits to conclude that the least electronegative X1 end atom…

Chromatographic and spectroscopic properties of regioisomers of some 1H-1,5-benzodiazepines

1994

The separation of the two regioisomeric derivatives of 1H-1,5-benzodia- zepine yielded from the reaction of 1,2-diamino-4-methylbenzene with 4-substituted acetophenones was performed by reversed phase high per- formance liquid chromatography, and the absorption spectra of the sepa- rated isomers have been determined for three isomer pairs which have been obtained starting from acetophenones with substituents of different electronegativity. The isomer ratio then could be estimated as well from the ratio of the peak areas as from the absorption spectra. They agree well with the known ratio determined from nmr intensities

From planar to nonplanar cyclotriphosphazenes

2008

Abstract A possible existence of planar (PNX 2 ) 3 cyclotriphosphazene, where X = H, F, Cl and Br, or nonplanar (PXNX) 3 was studied at the B3LYP/6-311++G ∗∗ and MP2/6-311++G ∗∗ level of calculations. A linear correlation of total electronic energy difference (Δ E  =  E nonplanar  −  E planar ) on electronegativity of the X substituent was observed. The more stable nonplanar form was predicted (Δ E  = −43.49 kcal/mol) only in case of X = H. The remaining planar halogenocyclotriphosphazenes are more stable, in agreement with a few available experimental data.

Stability of Borane−Adduct Complexes:  A G-2 Molecular Orbital Study

1997

Complexation energies of H3BXHn and [H3BXHn-1]- complexes (X = N, O, F, P, S, and Cl) (n = 3, 2, 1) have been computed at the G-2 level of theory. The formation of H3BXH3 (X = N, P) is found to be more favored than the formations of H3BXH2 (X = O, S) and H3BXH (X = F, Cl). The qualitative features of the molecular orbital interaction (the correlation diagrams) of H3BNH3 (C3v symmetry group), H3BOH2 (Cs symmetry group), and H3BFH (Cs symmetry group) complexes are presented. These diagrams show that the σ character of the B−X bond decreases and the π character increases when the electronegativity of X increases and indicate that the B−X bond cannot be treated only in terms of the simplest mod…

Semiempirical correlation between the optical band gap of oxides and hydroxides and the electronegativity of their constituents

2000

AbstractOn the basis of new experimental results a previous proposed correlation between the optical band gap of oxides and the difference of electronegativity of their constituents is extended to mixed crystalline and amorphous TiO2-Fe2O3 (d,d-metal oxides) as well as to amorphous passive films grown on Al-Ta, Al-Ti, Al-Nb and Al-W alloys (sp,d-metal oxides). Moreover in analogy with previous results on anhydrous oxides, a correlation is proposed between the optical band gap of hydroxides and the electronegativities of their constituents after substituting the electronegativity of hydroxilic group to that of the oxygen. Like in the case of anhydrous oxides, two different interpolation line…

ChemInform Abstract: Mixed Group 14-Group 14 Bonds. Part 5. Six Perphenylated Propane Analogues Ph3M-M′Ph2-M′′Ph3 (M, M′, M′′: Si/Ge): Electronegativ…

2010

An Improved Force Field for O2, CO and CN Binding to Metalloporphyrins

2004

Parametrization of a molecular-mechanics program to include terms specific for five- and six-coordinate transition metal complexes is applied to heme complexes. The principal new feature peculiar to five and six coordination is a term that represents the effect of electron-pair repulsion modified by the ligand electronegativity and takes into account the different possible structures of complexes. The model system takes into account the structural differences of the fixing centre in the haemoglobin subunits. The customary proximal histidine is added. The macrocycle heme IX is wholly considered in our model. The calculations show clearly that certain conformations of heme IX–histidine models…