Search results for "Irak"

El silencio es de oro

2003

Consenso perverso

2005

Bush y la extrema derecha

2003

Naciones Unidas / 2. Cumbre bajo mínimos

2005

Do Extremely Bent Allenes Exist?

2009

Bent allenes: Theoretical calculations show that extremely bent allenes, cyclic or acyclic, adopt a ground state that only bears a formal relationship to classical allenes. Consequently, five-membered ring allenes favor a carbene-like electronic structure and formally contain a trivalent carbon(II) center. peerReviewed

Density functional/molecular dynamics simulations of phase-change materials

2013

Bond Stretching and Redox Behavior in Coinage Metal Complexes of the Dichalcogenide Dianions [(SPh2P)2CEEC(PPh2S)2]2− (E=S, Se): Diradical Character …

2011

The metathetical reactions of a) [Li(tmeda)]2[(S)C(PPh2S)2] (Li2⋅3 c) with CuCl2 and b) [Li(tmeda)]2[(SPh2P)2CSSC(PPh2S)2] (Li2⋅4 c) with two equivalents of CuCl both afford the binuclear CuI complex {Cu2[(SPh2P)2CSSC(PPh2S)2]} (5 c). The elongated (C)S[BOND]S(C) bond (ca. 2.54 and 2.72 Å) of the dianionic ligand observed in the solid-state structure of 5 c indicate the presence of diradical character as supported by theoretical analyses. The treatment of [Li(tmeda)]2[(SPh2P)2CSeSeC(PPh2S)2] (Li2⋅4 b) and Li2⋅4 c with AgOSO2CF3 produce the analogous AgI derivatives, {Ag2[(SPh2P)2CEEC(PPh2S)2]} (6 b, E=Se; 6 c, E=S), respectively. The diselenide complex 6 b exhibits notably weaker Ag[BOND]Se…

Synthesis of a labile sulfur-centred ligand, [S(H)C(PPh2S)2]-: structural diversity in lithium(i), zinc(ii) and nickel(ii) complexes

2016

A high-yield synthesis of [Li{S(H)C(PPh2S)2}]2 [Li2·(3)2] was developed and this reagent was used in metathesis with ZnCl2 and NiCl2 to produce homoleptic complexes 4 and 5b in 85 and 93% yields, respectively. The solid-state structure of the octahedral complex [Zn{S(H)C(PPh2S)2}2] (4) reveals notable inequivalence between the Zn–S(C) and Zn–S(P) contacts (2.274(1) Å vs. 2.842(1) and 2.884(1) Å, respectively). Two structural isomers of the homoleptic complex [Ni{S(H)C(PPh2S)2}2] were isolated after prolonged crystallization processes. The octahedral green Ni(II) isomer 5a exhibits the two monoprotonated ligands bonded in a tridentate (S,S′,S′′) mode to the Ni(II) centre with three distinctl…

Äänenvärin ja fundamenttitaajuuden yhtenäisyys sensomotorisessa synkronoitumistehtävässä

2015

Aikaisempi tutkimus äänenvärin ja fundamenttitaajuuden yhtenäisyydestä on keskittynyt tutkimaan niiden havaitsemista toiminnasta erillisenä prosessina. Viimeaikainen tutkimus on kuitenkin osoittanut, että ihmisen havainto- ja toiminta-alueet ovat yhteenkytkeytyneitä. Tässä työssä tutkittiin äänenvärin ja fundamenttitaajuuden yhtenäisyyttä sensomotorisessa synkronoitumistehtävässä, jolloin niiden yhtenäisyydestä saatiin tietoa osana ihmisen tavoitteellista toimintaa. Koeasetelmaan osalllistui 11 koehenkilöä. Kymmenen, joilla oli aikaisempaa musiikillista kokemusta (mediaanivuodet 12.5), aineisto analysoitiin. Koehenkilöiden tehtävänä oli valikoivaa tarkkaavaisuutta vaativassa taputustehtäväs…

Rehabilitation of two northern river lamprey (Lampetra fluviatilis) populations impacted by various anthropogenic pressures : lessons learnt in the p…

2019

The pioneering work done during the past three decades in the regulated Rivers Perhonjoki and Kalajoki, Finland, to study and rehabilitate river lamprey populations is presented. The effects of various anthropogenic activities and rehabilitation measures are evaluated based on habitat surveys and long-term monitoring of larval densities, numbers of adults migrating upstream and of transformers migrating downstream. Telemetric tracking and tagging experiments were used to determine the efficacy of fishways. Lamprey populations in both rivers decreased in the 1980s and 1990s. This was linked to obstructed upstream migration of adults and deterioration of habitats for different life stages due…