XIIe Congrès des études juives

Au XIIe Congrès Mondial des Études Juives, qui s’est tenu à Jérusalem du 29 juillet au 5 août 1997, plusieurs séances ont été consacrées à des thèmes concernant « la Société juive contemporaine ». Les nombreuses communications qui y ont été présentées concernaient les réalités récentes des judaïcités dans différents pays de la Diaspora, ainsi que des aspects du développement social et culturel de l’État d’Israël. Les perspectives et les méthodes des sciences sociales ont reçu plus d’attention..

XIIe Congrès des études juives

Au XIIe Congrès Mondial des Études Juives, qui s’est tenu à Jérusalem du 29 juillet au 5 août 1997, plusieurs séances ont été consacrées à des thèmes concernant « la Société juive contemporaine ». Les nombreuses communications qui y ont été présentées concernaient les réalités récentes des judaïcités dans différents pays de la Diaspora, ainsi que des aspects du développement social et culturel de l’État d’Israël. Les perspectives et les méthodes des sciences sociales ont reçu plus d’attention..

Anodic behaviour of carbon steel bars in realkalised concrete: potentiodynamic and potentiostatic tests in solution

Electrochemical realkalisation is a technique used for the repair of reinforced concrete structures sufferingcarbonation-induced corrosion. It aims at restoring high levels of pH through the application of a temporarycathodic current. Although this technique was introduced in the 1980s and has been used since then, there arestill some aspects connected with its application that need investigation. In particular, it is not clear whether theusual techniques for measuring the corrosion activity of steel after the treatment can be considered reliable.This paper presents an experimental study on the anodic potentiodynamic and potentiostatic behaviour of steelin solutions simulating realkalised concrete and, for comparison, in solutions simulating alkaline and carbonatedconcrete. Results showed that in the alkaline solution used in the treatment steel bars are characterised bypassivity, in spite of the high values of corrosion rate measured with linear polarisation technique

Electron transfer and CO addition to polynitrido cobalt carbonyl clusters: Parallel pathways for conversion of the [Co10N2(CO)(19)](4-) anion to the novel [Co11N2(CO)(21)](3-) anion

The redox aptitude of the dinitrido anion [Co10N2(CO)19]4- has been tested from both chemical and electrochemical points of view, together with its reactivity toward CO that induces disproportionation. In any case, through a remarkable overlapping of intermediate steps, the new anion [Co11N2(CO)21]3- (4) is eventually obtained. A detailed study of the pathways to 4 allowed the identification of three labile intermediates by their characteristic IR spectra as well as their electrochemical and paramagnetic properties. The unprecedented structure of trianion 4 has been studied in details in two different crystalline salts

NaIrO3 - A pentavalent post-perovskite

Sodium iridium(V) oxide, NaIrO3, was synthesized by a high pressure solid state method and recovered to ambient conditions. It is found to be isostructural with CaIrO3, the much-studied structural analogue of the high-pressure post-perovskite phase of MgSiO3. Among the oxide post-perovskites, NaIrO3 is the first example with a pentavalent cation. The structure consists of layers of corner- and edge-sharing IrO6 octahedra separated by layers of NaO8 bicapped trigonal prisms. NaIrO3 shows no magnetic ordering and resistivity measurements show non-metallic behavior. The crystal structure, electrical and magnetic properties are discussed and compared to known post-perovskites and pentavalent perovskite metal oxides.Comment: 22 pages, 5 figures. Submitted to Journal of Solid State Chemistr

Structural variations, electrochemical properties and computational studies on monomeric and dimeric Fe-Cu carbide clusters, forming copper-based staple arrays

The halide ligands of [Fe4C(CO)12(CuCl)2]2- (1) and [Fe5C(CO)14CuCl]2- (2) can be displaced by N-, P- or S-donors. Beside substitution, the clusters easily undergo structural rearrangements, with loss/gain of metal atoms, and formation of Fe4Cu/Fe4Cu3 metallic frameworks. Thus, the reaction of 1 with excess dppe yielded [{Fe4C(CO)12Cu}2(\uf06d-dppe)]2- (3). [{Fe4C(CO)12Cu}2(\uf06d-pyz)]2- (4) was obtained by reaction of 2 with Ag+ and pyrazine. [Fe4C(CO)12Cu-py]- (5) was formed more directly from [Fe4C(CO)12]2-, [Cu(NCMe)4]+ and pyridine. [Fe4Cu3C(CO)12(\uf06d-S2CNEt2)2]- (6) and [{Fe4Cu3C(CO)12(\uf06d-pz)2}2]2- (7) were prepared by substitution of the halides of 1 with diethyldithiocarbammate and pyrazolate, in the presence of Cu(I) ions. All these products were characterized by X-ray analysis. 3 and 4 and 5 are square based pyramids, with iron in the apical sites, the bridging ligands connect the two copper atoms in 3 and 4. 6 and 7 are octahedral clusters with an additional copper ion held in place by the two bridging anionic ligands, forming a Cu3 triangle with Cu-Cu distances ranging 2.63-3.13 \uc5. In 7, an additional unbridged cuprophilic interaction (2.75 \uc5) is formed between two such cluster units. DFT calculations were able to reproduce the structural deformations of 3-5, and related their differences to the backdonation from the ligand to Cu. Additionally, DFT found that, in solution, the tight ion pair [NEt4]27 is almost isoenergetic with the monomeric form. Thus, 3, 4 and 7 are entities of nanometric size assembled either through conventional metal-ligand bonds, or weaker electrostatic interactions. None of them allows electronic comunication between the two monomeric units, as shown by electrochemistry and spectroelectrochemical studies

Molecular magnetic quantum dots in multivalent metal cluster compound

Quantum Matter and Optic

Guidelines for the management of pregnancy in women with cystic fibrosis

Women with cystic fibrosis (CF) now regularly survive into their reproductive years in good health and wish to have a baby. Many pregnancies have been reported in the literature and it is clear that whilst the outcome for the baby is generally good and some mothers do very well, others find either their CF complicates the pregnancy or is adversely affected by the pregnancy. For some, pregnancy may only become possible after transplantation. Optimal treatment of all aspects of CF needs to be maintained from the preconceptual period until after the baby is born. Clinicians must be prepared to modify their treatment to accommodate the changing physiology during pregnancy and to be aware of changing prescribing before conception, during pregnancy, after birth and during breast feeding. This supplement offers consensus guidelines based on review of the literature and experience of paediatricians, adult and transplant physicians, and nurses, physiotherapists, dietitians, pharmacists and psychologists experienced in CF and anaesthetist and obstetricians with experience of CF pregnancy. It is hoped they will provide practical guidelines helpful to the multidisciplinary CF teams caring for pregnant women with CF