摘要:
The present invention relates to anodes of composite materials, which are formed on a support constituted by fibrils, which are coated with a conducting layer of copper of thickness comprised between 3 and 10 microns. The copper layer is covered with a layer of cadmium of thickness comprised between 3 and 6 microns and the latter is covered with a layer of zinc of thickness greater than about 20 microns.
摘要:
An optical device intended for the analysis of a scattering medium, including at least one light source distant from the scattering medium and capable of providing an incident light beam intended to illuminate the scattering medium; at least one sensor capable of detecting a radiation emitted by the scattering medium; a support of the scattering medium at least partially non-absorbing for the incident light beam and the scattered radiation. All or part of the support is formed of a scattering material having a decreased scattering coefficient greater than 0.1 cm−1 and smaller than 700 cm−1.
摘要:
The present invention relates to a process for coating reinforcing elements preferably in fiber form, wherein said material is treated, between two electrodes, by the field obtained by means of a direct electric current of voltage included between 50 and 150,000 V and/or by means of an alternating electric current of frequency between 50 and 1,000 Hz and of voltage included between 10,000 and 30,000 V, and said element is placed in contact with a powder of a conductive or semi-conductive material.
摘要:
A method for desalination of sea water using a main electrochemical generr which has an anode compartment through which the water to be desalinated is fed and which causes formation in the solution of chlorates and perchlorates, removal of the latter being effected by a potassium salt such as potassium bicarbonate. The insoluble matters are separated from the solution, while the residual salts dissolved therein are oxidized at the anode of secondary electrochemical generator(s), under the form of persalts apt to be precipitated and removed by settling or filtration. The insoluble matters obtained at the various stages of this treatment can be decomposed by heating or electrolysis or under the action of a strong acid such as hydrochloric acid. The power consumed during desalination may be wholly or partly supplied by the above mentioned main electrochemical generator and secondary electrochemical generators.This method may be used to provide fresh water for agricultural, industrial or domestic purposes.
摘要:
A fluid control apparatus and method for a positive displacement engine or compressor which has a treatment chamber that communicates with a fluid admission duct and an exhaust duct via a port, and contains a piston within the treatment chamber which reciprocates between a top dead center and a bottom dead center position. The piston carries a poppet valve sealing member which is activated to provide substantially perfect sealing between the port and the treatment chamber when the piston is in the immediate vicinity of top dead center position, and is deactivated when the piston is in a position other than the immediate vicinity of the top dead center position in order to allow fluid to pass freely through the port.
摘要:
Process for the preparation of a composite material formed of reinforcing fibers, regularly distributed and oriented in more than two directions, and of a matrix filling up the space between said fibers.According to the invention, said process consists in: producing a convex brush of said reinforcing fibers, regularly distributed and fixed by one of their ends on a convex base, said fibers being subjected to an intensive D.C. electrostatic field, oriented in parallel to said fibers so that the fibers are immobilized in stretched condition perpendicularly to the base surface; inserting between said fibers, layers or grids of fibers, disposed successively at 90.degree. from one another, said insertion being carried out while the reinforcing fibers fixed on said base are subjected to the intensive D.C. electrostatic field; removing the elements used for fixing the fibers of the brush; impregnating the fibrous structure with a liquid pre-matrix, and optionally subjecting it to a compression for subsequent densification of the resulting pre-material; and finally, subjecting the pre-material to conditions permitting the formation of the matrix.
摘要:
The present invention relates to a process for the preparation of a composite material wherein the element used to reinforce the composite material is subjected to an electrostatic field induced by a high voltage electric current, said element being then impregnated with a liquid matrix material or precursor of matrix, while still under the influence of said field, and to the composite materials obtained by carrying out said process.
摘要:
An optical device intended for the analysis of a scattering medium, including at least one light source distant from the scattering medium and capable of providing an incident light beam intended to illuminate the scattering medium; at least one sensor capable of detecting a radiation emitted by the scattering medium; a support of the scattering medium at least partially non-absorbing for the incident light beam and the scattered radiation. All or part of the support is formed of a scattering material having a decreased scattering coefficient greater than 0.1 cm−1 and smaller than 700 cm−1.
摘要:
A fluorescence imaging device comprises a light source with two wavelengths and variable lighting power. The light source is in the form of a ring and it comprises an alternation of first and second zones respectively able to emit first and second light radiations respectively having distinct first and second wavelengths. Each of the zones further comprises a plurality of elementary light sources controllable independently by selective lighting control means of said elementary sources.
摘要:
The present invention relates to an interferential or interference dielectric mirror and to its production process. The mirror includes a ground, planar substrate, whose surface has been replicated with a thermal plastic resin, the substrate being covered with at least one layer of colloids having a low refractive index and at least one layer of colloids having a high refractive index, the two layer types being arranged in an alternating manner. The mirror is both inexpensive and resistant to laser flux.