Search results for "Moi"
showing 10 items of 2109 documents
Le son et le pouvoir en Bourgogne au XVe siècle
2000
Place: Paris Publisher: PUF
Moir\'e-enabled topological superconductivity
2020
The search for artificial topological superconductivity has been limited by the stringent conditions required for its emergence. As exemplified by the recent discoveries of various correlated electronic states in twisted van der Waals materials, moir\'e patterns can act as a powerful knob to create artificial electronic structures. Here, we demonstrate that a moir\'e pattern between a van der Waals superconductor and a monolayer ferromagnet creates a periodic potential modulation that enables the realization of a topological superconducting state that would not be accessible in the absence of the moir\'e. The magnetic moir\'e pattern gives rise to Yu-Shiba-Rusinov minibands and periodic mod…
Comparative G2(MP2) Molecular Orbital Study of B3H7XH3 and H3BXH3 Donor−Acceptor Complexes (X = N, P, and As)
2002
B3H7XH3 and H3BXH3 (X = N, P, and As) have been studied as donor−acceptor complex type at the G2(MP2) level of theory. Both single- and double-bridged structures of B3H7 Lewis acid are taken into account. Although the double-bridged structure is energetically favored in the isolated state, the coordination prefers the single-bridged one. The monoborane adducts adopt the staggered arrangement with C3v symmetry. The energetic analysis by natural bond orbital theory shows that the decrease of hyperconjugative contribution upon complexation in the B3H7 moiety has, as consequence, a loss of symmetry for B3H7XH3 (X= P and As) complexes. In the two series, the coordination is the result of two opp…
Optically Active Titanium Complexes Containing Linked Amido‐cyclopentadienyl Ligands: Their Use as Asymmetric Hydrogenation Catalysts
1996
Optically active titanium complexes of the formula Ti(η5:η1−C5R4SiMe2NCHMePh)Cl2 (R = H, Me), containing the cyclopentadienyl ligand linked to a chiral 1-phenylethylamido moiety, were synthesized and characterized in both enantiomerically pure forms. A single-crystal X-ray structural analysis of (S)()Ti(η5:η1−C5H4SiMe2NCHMePh)Cl2 shows a conformation in which the phenyl group is turned away from the metal center. NOE measurements suggest that a related structure is retained in solution. Upon activation with n-butyllithium, these complexes show hydrogenation activity toward imines with slight enantioselectivity.
UV photostability of metal phthalocyanines in organic solvents
2003
Kinetic studies of photochemical reactions induced by UV radiation in solutions of metal phthalocyanines have been carried out to determine the factors which might have influenced the stability of photosensitized phthalocyanines. Complexes of the molecular type Mpc, M'(2)pc, and Lnpc(2) (where M = Li, Mg, Fe, Co, Zn, Pb; M'= Tl; Ln = rare earth; pc = phthalocyanine ligand, C(32)H(16)N(8)(2-)) were investigated in DMF, DMSO, and pyridine. Progressive decay of the phthalocyanine macrocycle due to absorption of UV light was observed. Phthalimide found in the final photolysis product may indicate some chemically bonded oxygen involved in the solid phthalocyanine material. Fluorescence lifetimes…
Ligand mediated structural diversity of copper(II)-azido moiety: Synthesis, structure and magnetic study
2022
Abstract Two copper azido complexes [Cu4(L1)4(µ1,1-N3)3(N3)] (1) and [{Cu2(L2)(N-benzylen)(µ1,1-N3)3(µ1,1,3-N3(N3)]n (2) have been synthesized by the reaction of aqueous solution of sodium azide to a methanolic solution of copper perchlorate hexahydrate and corresponding Schiff-base ligands. Schiff bases HL1 and HL2 act as blocking coligands are derived from the 1:1 condensation of N-benzyl ethylenediamine with Salicyldehyde and 2-hydroxy-5-chloroacetophenone respectively (N-benzylen is the N-benzyl ethylenediamine). These two complexes are characterized by the elemental analysis, FT-IR, single crystal X-ray diffraction, powder XRD and also TGA. Single crystal X-ray structural study reveals…
The problem of spatial homogeneity in an LCoS projector
2019
Abstract Video projectors allow interesting applications in vision sciences since they provide a large projection area. We have colorimetrically characterized a LCoS projector using a mathematical model requiring additivity and constancy of the primaries -a sigmoid function in our case. Significant differences in chromaticity in the CIELAB space, but not in lightness, were found between the center and the corners of the screen. The lack of spatial homogeneity led us to estimate the parameters of the model as a function of spatial position, using different strategies. The best result was obtained by interpolating the values of the parameters of the model determined from experimental measurem…
Los viajes de Maximiliano a España y Brasil: el largo camino hacia el imperio mexicano
1970
En mayo de 1864 Maximiliano de Austria llega a la costa mexicana en el que será su último viaje, que culminará con su ejecución tres años después. Mucho se ha escrito sobre las razones que le impulsaron a aceptar la corona de México, un país tan alejado en todos los sentidos de su entorno cultural, sin embargo, años antes Maximiliano había viajado a España y a Brasil (a España en dos ocasiones) y estas experiencias, si no determinantes, influyeron en gran medida en la decisión del Archiduque, que vio la oportunidad de hacer realidad un sueño que se gestó en su viaje a España y se afianzó durante su estancia en Brasil, como se puede extraer de sus memorias de viaje. In May of 1864, Maximilia…
Quel référent pour les romans de la post-mémoire au début du XXIe siècle ?
2014
Nous entendons montrer la confusion qui peut exister, dans deux exemples de romans de la memoire ou de la post-memoire (Martina la rosa numero trece d’Angeles Lopez et El dia de manana d’Ignacio Martinez de Pison), entre ecriture referentielle et autoreferentielle et remettre en question la distinction qui se fait habituellement entre la nature endogene de l’autoreference et la nature exogene de l’operation de reference. C’est la genese de l’ecriture qui devient alors le principal referent.
Los diferentes «tiempos» en Bourrasque de Hélène Lenoir
2011
Hélène Lenoir présente dans Bourrasque, le premier de ses romans, une vision du temps particulière et caractéristique de son univers romanesque. A travers différentes techniques stylistiques, le temps abstrait et chronologique de l’histoire se transforme en temps expérimenté et vécu par le personnage principal. Dans Bourrasque le temps se manifeste en tant qu’expérience personnelle d’un personnage qui réfléchit à propos de son passé (mémoire), qui observe le présent (vision) et qui pense le futur (projection). Hélène Lenoir presents in the first of her novels, Bourrasque, a distinctive and characteristic vision of time within her fictional universe. Through various stylistic techniques, the…