摘要:
The present invention provides a photo-crosslinkable composition for fabricating a material for a step-index plastics optical fiber. The invention is remarkable in that the photo-crosslinkable composition comprises an acrylate derivative of a compound based on bisphenol, and a photoinitiator.
摘要:
The present invention relates to a fire-resistance composition in particular as a material for a power and/or telecommunications cable. The invention is remarkable in that the composition comprises a polymer together with aluminum oxide in the form of particles having a mean diameter of less than one micrometer.
摘要:
A subject-matter of the invention is a copolymer comprising at least 3 units, P1, P2 and P3, with the following general formulae: with X1, X2 and X3, which are identical or different, taken from the group of atoms consisting of H, F, Cl and Br; with R1 taken from the group of atoms consisting of H, F, Cl and Br; with R2 a carbonaceous group comprising from 1 to 10 partially or completely fluorinated carbon atoms; with Y1 and Y2, which are identical or different, taken either from the group of atoms consisting of H, F, Cl and Br or from the family of the carbonaceous groups comprising from 1 to 10 carbon atoms; with Y3 a carbonyl group or a divalent carbonaceous group; the content of P2 unit in the copolymer being between 30 and 70 mol % for respectively a content of P1 and P3 units in the copolymer of between 70 and 30 mol % and the weight-average molar mass (Mw) of the said copolymer being between 103 and 106 g/mol. Preferably, the copolymer is of CTFE/VCA/HFP or TFE/VCA/HFP type.
摘要:
A method for formulating a knowledge database of object images acquired by an imaging device furnished with a sensor, including defining N classes each including a set of objects represented by a label and a set of characteristics, learning decision rules associated with these classes, definition of K contextual information cues regarding image background fk, with k varying from 1 to K and K>1, association of one of these information cues regarding image background fk with each object, allotting of the objects into M new classes, with N
摘要:
The present invention concerns a fire resistant composition particularly for a power and/or telecommunications cable, said composition comprising a polymer and a fire retardant filler. The invention is remarkable in that the polymer is thermoplastic in type and in that the fire retardant filler comprises cork.
摘要:
The invention relates to an electrical conductor coated in an insulating layer itself coated in a bonding layer, the conductor being characterized in that said bonding layer is obtained from a composition comprising a thermoplastics polymer and a settable resin. The invention also applies to a method of manufacturing such an electrical conductor coated in a bonding layer, the method being characterized in that it comprises applying said composition on said electrical conductor coated in said insulating layer, and applying treatment to cause said settable resin to be cured at least in part.
摘要:
A method for formulating a knowledge database of object images acquired by an imaging device furnished with a sensor, including defining N classes each including a set of objects represented by a label and a set of characteristics, learning decision rules associated with these classes, definition of K contextual information cues regarding image background fk, with k varying from 1 to K and K>1, association of one of these information cues regarding image background fk with each object, allotting of the objects into M new classes, with N
摘要:
The invention relates to a method of stabilizing the images of a scene, acquired by means of an observation device of an imaging system, comprising the step of digital processing of a stream of successive images. It comprises a step of acquiring gyrometric measurements by means of at least one gyrometric sensor secured to the observation device, of using these gyrometric measurements to determine so-called approximate shifts undergone between successive images, and the image processing step comprising a sub-step of using the approximate shifts and the image stream acquired to determine so-called fine shifts undergone between successive images.
摘要:
The present invention provides a power and/or telecommunications cable including at least one layer of a material obtained from a composition comprising: a thermoplastic polymer matrix; and a phenolic resin; wherein said phenolic resin is selected from novolac phenol-formaldehyde resins and novolac cyanate ester resins, and wherein said material includes nodules of hardened phenolic resin dispersed throughout the material.