Search results for " perch"
showing 10 items of 189 documents
Le site néolithique final de la Bastide Blanche (Peyrolles-en-Provence, Bouches-du-Rhône) : Premiers résultats 2003-2004
2006
The Bastide Blanche (Peyrolles-en-Provence, Bouches-du-Rhône) is a small settlement perched in edge of the Durance where the principal occupation is ascribable to the extreme end of the Neolithic era. Recognized in the past, it was the subject of multiple excavations but of any study nor of any specific publication. A survey campaign and a first excavation campaign programmed in 2003 and 2004 make it possible today to specify the homogeneity of the assemblies often mentioned in the scientific literature. Beyond the first description of the structures and archaeological furniture put at the day, this short note makes it possible to announce the existence of a sequence for the Rhone-Ouvèze gr…
Effect of Lithium Perchlorate on the Kinetics of the Anionic Polymerization of Methyl Methacrylate in Tetrahydrofuran
1999
The kinetics of the anionic polymerization of methyl methacrylate in the presence of lithium perchlorate (LiClO 4 ) are investigated in THF using 1,1-diphenylhexyllithium as initiator in a flow-tube reactor between -30 and 0 °C. The rate constants of propagation determined in the presence of LiClO 4 are lower than those obtained in the absence of the salt, similar to the effect observed for LiCl. For propagation, the reaction order with respect to active center concentration is found to be 0.5 in both cases, which indicates that LiClO 4 does not effectively perturb the aggregation of the enolate ion pair. The formation of various mixed aggregates is proposed. The polydispersity index of the…
Electrochemical Growth and Physico-Chemical Characterization in Organic Medium of Nb2O5 Thin Films
2008
Investigations about the energetics and the electrical properties of niobium thin film, electrochemically grown, were performed in an organic solution of acetonitrile and lithium perchlorate. The study of the energetics of the Nb2O5/organic solution interface was performed by means of a non-destructive optical technique, photocurrent spectroscopy. By means of this technique, it was possible estimating the value of the flat band potential and locating conduction and valence band. A more cathodic value of flat band potential in respect with acidic solution was found in organic medium. From impedance spectra, the electrical circuit that gives best fitting values is constituted by two resistanc…
Structure of the copper (II) perchlorate complex with Schiff base ligand containing pyridine N-oxide fragments and propylene bridges: Solvatochromic …
2005
Abstract The copper (II) perchlorate complexes with Schiff base ligands were investigated by X-ray single crystal analysis, electron spectroscopy, infrared and electron paramagnetic spectroscopy. The Schiff bases were obtained as condensation products of 2-pyridinecarboxaldehyde N-oxide with dipropylenetriamine (L1) and triethylenetetramine (L3), respectively. The structure of the complex [CuL2](ClO4)2 was solved. In the structure, the ligand exists in the form of aliphatic polyamine containing two Schiff bases in contrary to the free form of this ligand with one pyrimidine ring and one Schiff base. Electronic spectra of the copper (II) perchlorate complexes of both ligands in different sol…
Formation Of perched leachate zones in MSW landfill
2010
The paper presents a 1D mathematical model for the simulation of the percolation fluxes throughout a landfill for municipal solid waste (MSW). Specifically, the model is based on mass balance equations, that enable one to simulate the formation of perched leachate zones in a landfill for MSW. The model considers the landfill divided in several layers evaluating the in and out flow throughout each layer as well as the continuous moisture distribution. The infiltration flow is evaluated by means of the Darcy’s law for an unsaturated porous medium, while the moisture distribution evaluation has been carried out on the basis of the theory of the vertically distributed unsaturated flow. The solu…
L'evento persona
2018
Il titolo è un monogramma dell’opera: la persona è un evento educativo, la sua ontologia apre il senso originario dell’educare. La Prima parte contiene i Segnavia, saggi di pedagogia fondamentale che elaborano una concezione dell’educazione definita da due istanze: una esistenziale, la realizzazione di una vita piena e totale; l’altra storica, la personalizzazione di un’eredità di senso. La Seconda parte apre Sentieri, attraverso testi di antropologia pedagogica che esplicitano quanto apprendiamo sulla persona nei mondi dell’educazione. Sono dedicati alla famiglia e all’«umanesimo dell’intimità»; all’esperienza di quanti, soprattutto nel volontariato, fanno rientrare nella riuscita della vi…
CCDC 224283: Experimental Crystal Structure Determination
2004
Related Article: J.Vicente, M.-T.Chicote, M.D.Abrisqueta, M.M.Alvarez-Falcon, M.C.R.de Arellano, P.G.Jones|2003|Organometallics|22|4327|doi:10.1021/om030372r
CCDC 1407214: Experimental Crystal Structure Determination
2016
Related Article: Alejandro Pascual-Álvarez, Tamara Topala, Francisco Estevan, Francisca Sanz and Gloria Alzuet-Piña|2016|Eur.J.Inorg.Chem.||982|doi:10.1002/ejic.201501469
CCDC 176984: Experimental Crystal Structure Determination
2002
Related Article: C.Jubert, A.Mohamadou, C.Gerard, S.Brandes, A.Tabard, J.-P.Barbier|2002|J.Chem.Soc.,Dalton Trans.||2660|doi:10.1039/b111614b
CCDC 1534659: Experimental Crystal Structure Determination
2017
Related Article: Karolina Zdyb, Maxym O. Plutenko, Rostislav D. Lampeka, Matti Haukka, Malgorzata Ostrowska, Igor O. Fritsky, Elzbieta Gumienna-Kontecka|2017|Polyhedron|137|60|doi:10.1016/j.poly.2017.07.009