Search results for "Irak"
showing 10 items of 120 documents
El terrorismo de la seguridad
2003
Carta desde Europa
2002
Respuesta a "Carta de América" en español, francés, e inglés. El texto fue enviado a "Le Monde", "El País" y posiblemente también a "The Guardian" y "Le monde diplomatique". Se desconoce si el manifiesto finalmente se publicó en alguno de estos medios (u otros).
N-Heterocyclic Carbenes with Inorganic Backbones: Electronic Structures and Ligand Properties
2008
The electronic structures of known N-heterocyclic carbenes (NHCs) with boron, nitrogen, and phosphorus backbones are examined using quantum chemical methods and compared to the experimental results and to the computational data obtained for a classical carbon analogue, imidazol-2-ylidene. The σ-donor and π-acceptor abilities of the studied NHCs in selected transition-metal complexes are evaluated using a variety of approaches such as energy and charge decomposition analysis, as well as calculated acidity constants and carbonyl stretching frequencies. The study shows that the introduction of selected heteroatoms into the NHC backbone generally leads to stronger metal−carbene bonds and theref…
Electronic Structures of Main-Group Carbene Analogues
2007
The electronic structures of 15 group 13−16 carbene analogues are analyzed using various quantum chemical methods and compared to the data obtained for the parent N-heterocyclic carbene (NHC), imidazol-2-ylidene. The results of this study present a uniform analysis of the similarities and differences in the electronic structures of p-block main-group carbene analogues. Though all systems are formally isovalent, the theoretical analyses unambiguously indicate that their electronic structures run the gamut from CC localized (group 13) to CN localized (group 16) via intermediate, more delocalized, systems. In particular, neither the stibenium ion nor any of the chalcogenium dications is a dire…
El horror político
1997
Los 'think-tanks', miseria de ideas / 2
2008
José Vidal Beneyto. Europa, hora cero
2003
España en Europa; España frente a Europa
2015
International audience
Ar stronciju aizvietotu peroksīdapatītu sintēze
2016
Ar stronciju aizvietotu peroksīdapatītu sintēze. Lorence K., zinātniskā vadītāja Dr. ķīm., Osīte A. Maģistra darbs, 42 lappuses, 29 attēli, 1 tabula, 40 literatūras avoti, 2 pielikumi. Latviešu valodā. Darbā veikta ar stronciju aizvietotu kalcija fosfātu peroksīdapatītu sintēze. Literatūras apskatā apkopota informācija par hidroksilapatītu un peroksīdapatītu uzbūvi un sintēzēm un iespējamajām to analīzes metodēm.
Yet Another New Variant of Szász–Mirakyan Operator
2021
In this paper, we construct a new variant of the classical Szász–Mirakyan operators, Mn, which fixes the functions 1 and eax,x≥0,a∈R. For these operators, we provide a quantitative Voronovskaya-type result. The uniform weighted convergence of Mn and a direct quantitative estimate are obtained. The symmetry of the properties of the classical Szász–Mirakyan operator and of the properties of the new sequence is investigated. Our results improve and extend similar ones on this topic, established in the last decade by many authors.