Abstract: The present invention relates to a method of cooling a static electronic power converter device including at least one electrical circuit including an assembly of active components and of passive components mounted in a closed radiator housing from which only the inlet and the outlet of the circuit communicate with the outside of the housing, in which the distribution of the heat energy given off by the active and passive components is made uniform throughout the inside volume of the housing, and the heat energy is transferred from the radiator housing by forced convection in substantially uniform manner over the entire inside surface of the walls of the housing by causing at least one fluid contained inside the leaktight housing to circulate in a closed circuit. The invention also provides a static electronic power converter device enabling the method to be implemented.

Abstract: The present invention relates to a method of cooling a static electronic power converter device (1) comprising at least one electrical circuit (3) comprising an assembly of active components and of passive components (11, 12, 13) mounted in a closed radiator housing (2) from which only the inlet means and the outlet means of said circuit communicate with the outside of said housing, in which the distribution of the heat energy given off by said active and passive components is made uniform throughout the inside volume of said housing, and said heat energy is transferred from said radiator housing by forced convection in substantially uniform manner over the entire inside surface of the walls of said housing by causing at least one fluid (15) contained inside said leaktight housing to circulate in a closed circuit. The invention also provides a static electronic power converter device enabling the method to be implemented.

Abstract: The invention relates to a suspension device for linking an item of on-board equipment item to the structure of a vehicle, such as a rotary wing aircraft.Advantageously, it comprises first (5) and second (6) elements shaped at least approximately as plates and capable of being fixed respectively to said structure (3) and to said equipment item (2), and suspension means (7) including damping members (14) linked respectively to the first and second elements and capable of acting along the three roll, pitch and yaw reference axes of said aircraft to absorb the linear displacements along said axes, and elastic suspension members (15) linked respectively to the first and second elements and capable of acting around the three reference axes to absorb the angular displacements.

Abstract: The present invention relates to new conductive perovskites containing oxygen and nitrogen, their preparation and their use particularly as electrode material.The conductive perovskites containing oxygen and nitrogen according to the invention correspond to the general formula IAB(O,N).sub.3 (I)in the cationic lattice of which:A denotes a metal chosen from the metals of groups IA and IIA, yttrium and the lanthanides,B denotes a metal chosen from the transition metals of groups IVA to IB,on the express condition that at least one of the metals A and B is present in an oxidation state other than its normal maximum oxidation state.

Abstract: The present invention relates to new nitrogen or oxynitrogen compounds of perovskite structure, corresponding to the general formula I:ABO.sub.3-n N.sub.n (I)in which:the cationic lattice consists of:a metal cation A chosen from the group comprising: Li.sup.+, Na.sup.+, K.sup.+, Rb.sup.+, Cs.sup.+, Ag.sup.+, Tl.sup.+, Ca.sup.2+, Ba.sup.2+, Sr.sup.2+, Pb.sup.2+, Cd.sup.2+, Ln.sup.3+, Bi.sup.3+, Y.sup.3+, Th.sup.4+, U.sup.4+, trans-U.sup.4+ ; anda metal cation B chosen from the group comprising: W.sup.6+, Re.sup.6+, Mo.sup.6+, Ta.sup.5+, Nb.sup.5+, Mo.sup.5+, W.sup.5+, Ti.sup.4+, Zr.sup.4+, Sn.sup.4+, Ge.sup.4+, Nb.sup.4+, Ta.sup.4+, Al.sup.3+, Ga.sup.3+, In.sup.3+, Tl.sup.3+, Fe.sup.3+, Cr.sup.3+ ;n=1, 2, or 3, andthe cationic charges a of the metal A and b of the metal B satisfy the equations:a+b=6+na.gtoreq.n,and the solid solutions of these compounds.