[6 phot. par C. Moulinet du lancement d'un ballon dirigeable à la Varenne-Saint-Hilaire, extraites de l'Aérophile du 18 févr. 1897, don du prince Roland Bonaparte]

Donateur : Bonaparte, Roland (1858-1924)

[Phot. d'un avion ayant atterri sur le Mont-Blanc, envoi dédicacé au prince Roland Bonaparte, 3 juillet 1921, des collections de ce dernier]

Donateur : Bonaparte, Roland (1858-1924)

[Phot. de l'hôtel du prince Roland Bonaparte avant sa transformation, don de l'Abbé Alphonse Bourzeix, le 26 juin 1896]

Donateur : Bourzeix, Alphonse (18..-19..? ; abbé)

[Phot. de la couronne du soleil, avec lettre d'envoi par le baron N. Raulbars au prince Roland Bonaparte, Helsingfors, 28 mai 1897]

Donateur : Bonaparte, Roland (1858-1924)

[41 phot. de Tchouktches prises lors du voyage de la Vega en 1879, expédition de A.E. Nordenskild le long des côtes de la Sibérie, des collections du prince Roland Bonaparte]

Donateur : Bonaparte, Roland (1858-1924)

Local character of magnetic coupling in ionic solids

Magnetic interactions in ionic solids are studied using parameter-free methods designed to provide accurate energy differences associated with quantum states defining the Heisenberg constant J. For a series of ionic solids including KNiF3, K2NiF4, KCuF3, K2CuF4, and high- Tc parent compound La2CuO4, the J experimental value is quantitatively reproduced. This result has fundamental implications because J values have been calculated from a finite cluster model whereas experiments refer to infinite solids. The present study permits us to firmly establish that in these wide-gap insulators, J is determined from strongly local electronic interactions involving two magnetic centers only thus providing an ab initio support to commonly used model Hamiltonians.

The Inaccuracy of National Character Stereotypes

Consensual stereotypes of some groups are relatively accurate, whereas others are not. Previous work suggesting that national character stereotypes are inaccurate has been criticized on several grounds. In this article we (a) provide arguments for the validity of assessed national mean trait levels as criteria for evaluating stereotype accuracy and (b) report new data on national character in 26 cultures from descriptions (N = 3323) of the typical male or female adolescent, adult, or old person in each. The average ratings were internally consistent and converged with independent stereotypes of the typical culture member, but were weakly related to objective assessments of personality. We argue that this conclusion is consistent with the broader literature on the inaccuracy of national character stereotypes.

Examination report on the City of Roland, Iowa for the period July 1, 2012 through June 30, 2013

Examination report on the City of Roland, Iowa for the period July 1, 2012 through June 30, 2013

Aux pasteurs des villes et des campagnes ([Reprod.]) / [J. M Roland]

Collection : Les archives de la Révolution française ; 8.1076

Meeting de Monaco, [avril 1920, le canot automobile] le Roland-Garros : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58981