Showing papers by "University of Bordeaux published in 1976"
TL;DR: In this paper, the influence of the nature of the adjuvant and its specific concentration, of temperature and hydrogen pressure on the reaction rate, have been carefully studied and the pressure-composition isotherms have been determined especially when the adjuvvant is LaNi5.
155 citations
TL;DR: In this paper, the formation and decay rate constants of the DODCI photoisomer were found to follow an Arrhenius law with respectively an activation energy of 4.5 ± 0.4 kcal/M and 14.3 kcal/m.
137 citations
115 citations
TL;DR: Based on the description of the brownmillerite structure, a model of oxygen vacancy ordering in the AMO 3-x phases along the direction of the cubic perovskite cell is proposed in this article.
105 citations
TL;DR: The limbic forebrain cortical projections of the A10 group provide a coherent anatomical basis for the behavioral syndrome provoked by RF and 6-OHDA lesions in the VMT.
87 citations
TL;DR: In this paper, the authors define a weakened rationality by two conditions, related to (but different from) Schwartz's rationality conditions, and apply the results to collective choice theory by proving that there exists one and only one Collective Choice Rule that is fully democratic and yields consistent, rational choice functions.
Abstract: Though they are related, " consistency " and " rationality " are different concepts. Consistency is concerned with what happens to choices when the set of available alternatives expands or contracts. Rationality is concerned with how the choices are related to a binary relation on the set of all alternatives. In this paper we define a weakened consistency by a strengthening of Sen's ,B condition (Sen [9], [10], [11]). We also define a weakened rationality by two conditions, related to (but different from) Schwartz's rationality conditions [8]. We study the relations between consistency and rationality thus defined, and apply the results to collective choice theory by proving that there exists one and only one Collective Choice Rule that is fully democratic and yields consistent, rational choice functions. Also, the revealed preference relations of these choice functions are transitive.
87 citations
TL;DR: In this paper, the magnetic properties have been analyzed on the basis of the Heisenberg-Dirac-Van Vleck model: the d electrons are localized on each Ru 5+ ion and interact strongly through antiferromagnetic exchange.
83 citations
TL;DR: Radiofrequency ablation of the ventral mesencephalic tegmentum provoked hyperactivity and hyper-reactivity in rats and the behavioral syndrome appeared 8 days after the lesions and persisted throughout the experiment, whereas only minor sleep disturbances were observed in animals with lesions.
79 citations
TL;DR: In this article, the ionic conductivity of new sheet phases obtained in the KLO/sub 2/--MO/sub n/ (L = In, Sc; M = Zr, Hf, Sn, Pb) systems and which are electronic insulators, was investigated.
78 citations
TL;DR: In this article, the anodic behavior of nickel in acidic media is carried out by steady state polarization curves and faradaic impedance measurements as a function of various parameters related to the electrolyte: pH, concentration and the nature of the anions.
63 citations
TL;DR: In this article, the authors investigated the manganese-oxygen-potassium system for K/Mn ratios ≤ 1, and showed that the decomposition of the system leads to new phases having vacancy layer structures with oxygen packing AABBCC and AABB.
Abstract: Resume. L'etude du systeme manganese-oxygene-potassium pour des rapports atomiques K/Mn ≤ 1 a permis d'isoler une serie de phases lacunaires originales presentant des structures a couches. Deux types d'empilements anioniques AABBCC et AABB ont ete mis en evidence; ceuxci presentent des distorsions qui different selon le taux en manganese trivalent.
La taille trop elevee du potassium ne permet pas la formation de structures a tunnels autres que celle du cryptomelane.
The KxMnO2 Phases (x ≤ 1)
The investigation of the manganese-oxygen-potassium system for K/Mn ratios ≤1 leads to new phases having vacancy layer structures with oxygen packing AABBCC and AABB; The distorsions vary with the content of manganese(III). The larger size of potassium atoms allows only the formation of a hollandite type tunnel phase.
TL;DR: In this article, a study of the magnetic and electric properties suggests the delocalization of the nickel e g electron in a partly filled σ* d x 2 − y 2 band.
TL;DR: In this paper, the study of ionic conduction in fluorides with fluorite type structure leads to new anionic superconductors of formulation Pb1−xBixF2+x (0 ⩽ x⩽ 0.50).
TL;DR: In this paper, the levels of the 6 P 7 2 (4f7) and 4f65d1 states of europium (+II) were determined from fluorescence spectra in a series of fluorides.
TL;DR: In this paper, the infrared reflection and polarized Raman scattering spectra of cubic Td 6 Bi 4 Ge 3 O 12 single crystals were recorded, allowing the classification of the observed phonon modes into the different allowed symmetry.
TL;DR: By using the technique of swelling in isoosmotic potassium salts, after a determination of the isotonic conditions, it was possible to discriminate between an electrogenic or an electroneutral (both valinomycin and uncoupler induced) translocation.
TL;DR: The icosahedral arrangement is a rather compact way of packing twelve atoms between which the small number of available electrons could be efficiently shared as discussed by the authors, and the Bis clusters are linked together by orientated bonds either directly (inter-icosahedral bond) or through isolated atoms.
Abstract: The various modifications of elemental boron and a number of boronrich phases have the common feature of being characterized by a three-dimensional skeleton of boron atoms built from icosahedral units of twelve boron atoms. The existence of icosahedral clusters, although unusual in crystal chemistry, is not entirely surprising in the case of covalent boron-rich phases, since the atom of boron has only three valence electrons. An icosahedral arrangement is a rather compact way of packing twelve atoms between which the small number of available electrons could be efficiently shared. The Bis clusters are linked together by orientated bonds, either directly (inter-icosahedral bond) or through isolated atoms. The variety and complexity of the structures of boron and boron-rich phases are the result of the special crystallographic features of the icosahedral Bi2 units and of their particular modes of association [ 11. The principles which rule the associations of the icosahedral Bis units will be illustrated in the case of MgAlBi,, Mg,B14 and Na,BB,,(O < x < 1) phases.
TL;DR: A new sulfide of vanadium and thallium TlxV6S8 (x = 0.52±0.2) has been prepared in this paper, which is characterized by infinite triple rutile chains along the c axis containing short V-V (2.860 A) distances.
TL;DR: In the presence of lithium and in tetrahydrofuran as solvent, trimethylchlorosilane reacts at 0-10°C, in an inert atmosphere, with monoaromatic mono- or disubstituted hydrocarbons, to give the corresponding 1,4-disilyl derivatives.
TL;DR: An inhibitory role of 5 HT neurons on self-stimulation behavior is evidenced and the possibility of an activating intervention of CA system different from that of the dorsal noradrenergic bundle is discussed.
TL;DR: In this article, the relative stability of octahedral and trigonal prismatic coordination in layered oxides A x MO 2 (x ⩽ 1) is discussed, and Rouxel's diagram for the A x MS 2 intercalation compounds allows a classification of both types of environment.
TL;DR: In this article, a graphique de l'impedance complexe d'un electrolyte solide mesuree en courant alternatif permet de determiner avec precision the resistance ohmique d a materiau et son energie d'activation.
TL;DR: The yield in pure tRNATrp was currently in the range of 25 to 30 percent of the total tryptophan acceptance of the starting curde tRNA, and no isoacceptors could be demonstrated by chromatography of the pure species on RCP 5 in 6 M urea.
TL;DR: In this article, the structural evolution of the series CaV n O 2 n +1 is described as n increases from n = 1 to n = 4; the vanadium +IV has a fivefold square pyramid coordination.
TL;DR: In this article, the structure of MgVO 3 was investigated in the orthorhombic system, space group Cmc 2 1, with a = 5.243 A, b = 10.028 A, and c = 11.019 A; the space group is Cmcm or C 2 cm.
TL;DR: Full enumeration of known localities shows the genus Grania to have a broad, disjunct distribution, low species number, and morphological conservatism, and the consideration of Hemigrania as a junior synonym, because of the now established absence of peptonephridia in Grania.
Abstract: Erseus, C. (Department of Zoology, University of Goteborg, S-400 33 Goteborg, Sweden) and Lasserre, P. Taxonomic status and geographic variation of the marine enchytracid genus Grania Southern (Oligochaeta). Zool. Scr. 5 (3–4): 121–132, 1976.—New material from Europe, Bermuda and the eastern coast of North America allow more realistic determination of the generic characteristics of the marine enchytraeid genus Grania. This re-evaluation of Grania necessitates the consideration of Hemigrania as a junior synonym, because of the now established absence of peptonephridia in Grania. Full enumeration of known localities shows the genus Grania to have a broad, disjunct distribution, low species number, and morphological conservatism. G. postclitellochaeta (Knollner) and G. macrochaeta (Pierantoni) are considered as polytypic species, containing respectively two (including G. postclitellochaeta longiducta subsp.n.) and three (including G. macrochaeta bermudensis subsp.n.) subspecies. G. maricola Southern, G. roscoffensis Lasserre, G. vario-chaeia sp.n. and G. monospermatheca sp.n. are considered as monotypic species.
TL;DR: In this article, the magnetic properties of rare earth tetraboride powders were studied and it was shown that NdB4, SmB4, GdB4 and HoB4 are antiferromagnetic at low temperature whereas PrB4 is ferromagnetic.
TL;DR: The electrical study of lithium boracites, which are electronic insulators, shows a high mobility of the Li + cation as mentioned in this paper, and they are the first high isotropically conducting Li compounds.
TL;DR: The clinical picture is remarkably consistent: there is a relatively long prodromal phase with difficulties in gait and writing, followed by a phase characterised by four signs, namely a severe confusional syndrome, myoclonus, astasia-abasia and disorders of language.