摘要:
A fire-proofing protective covering for an elongate structure such as a hose, an electrical or optical cable, or pneumatic or hydraulic ducting, comprises: a first plurality of layers made of an inorganic material having a structure which is suitable for imprisoning air while still allowing the operation of the elongate structure to be maintained at relatively high temperatures, of the order of at least 850.degree. C., and for a given length of time, of the order of at least several minutes, and a second plurality of layers, with each of the layers being disposed alternately relative to each of the layers of the first plurality so that the layers of the first plurality are on the inside while the layers of the second plurality are made of a material which substantially constitutes a barrier for the air imprisoned in the corresponding layer of the first plurality. The invention is applicable to the opto-electrical industry, to the hydraulic industry, etc. . . . for protecting ducting from fire.
摘要:
A monoblock X-ray generating device is provided. The device includes a rotor, a stator, an anode and a cathode positioned in a first module, the first module comprising a first cooling circuit. The device further includes a high voltage transformer positioned in a second module, the second module comprising a second cooling circuit. The first and second cooling circuits are positioned apart from each other, and one of the first and the second modules comprises a male connector and the other of the first and the second modules comprises a mating female connector.
摘要:
A filter plate having defects that may cause image artefacts is moved during an exposure. The movement distributes the defects of the plate in the image to a point where they can no longer be seen in the image. Preferably, the shifting of the plate is done in the plane of the plate, in a direction perpendicular to the axes of the rollers used for in the manufacture of the plate.
摘要:
An X-ray emission device and method for a radiology apparatus comprises a cathode and a rotating anode, the anode being provided with a roughly cylindrical surface. The device forms a beam of electrons that bombards a portion of the roughly cylindrical surface of the anode that constitutes the focal point of emission of the X-rays. The position of the focal point of the anode relative to a reference position is dynamically controlled.
摘要:
A filter plate having defects that may cause image artefacts is moved during an exposure. The movement distributes the defects of the plate in the image to a point where they can no longer be seen in the image. Preferably, the shifting of the plate is done in the plane of the plate, in a direction perpendicular to the axes of the rollers used for in the manufacture of the plate.
摘要:
A cassette for a device for continuously casting liquid metal between two parallel rolls, the cassette includes a metal case which has a lateral wall and is open on a side of the case, and plate of refractory material which may be preheated before casting the liquid metal. The refractory plate is preshaped in such a manner so to define a free space between the periphery of the plate and the lateral wall of the case. The cassette is provided with an arrangement for fixing and gripping the plate and exerting an elastically yieldable opposing action allowing free expansion of the plate within the case.
摘要:
The surface of each roll (2, 3) has a knurling constituted by two series of parallel grooves (5, 6) which are inclined to the axis (XX) of the roll and joining up at the center of the latter so as to form a series of chevrons, the two grooves (5, 6) of each chevron downwardly converging when they are on the side of the roll (2, 3) in contact with the liquid metal. The device is completed by a cage for extracting the cast product at a speed slightly higher than the speed of rotation of the casting rolls (2, 3). This arrangement avoids the formation of longitudinal or transverse cracks on the surface of the cast thin metal strip.
摘要:
This device comprises plates held against front faces (1a, 2a) of the rolls (1, 2) in order to close the ends of a casting space (3) delimited by the rolls; each front face (1a, 2a) of a roll is equipped with a flexible endless band (5, 5') bearing, on the one hand, on the roll at the junction of its front face (1a) and its cylindrical surface (1b) and, on the other hand, on the opposite face of the associated closing plate (4), in order to ensure the seal between the latter and the front faces of the rolls.
摘要:
A medical imaging system including a support, an X-ray emitting tube, and, facing the latter, a detector, the X-ray emitting tube being intended to accept displacements relatively to at least one portion of the support, the system also including a remote piece of equipment providing circulation of an oil intended to provide cooling and electric insulation of the X-ray emitting tube on the one hand, pipes in which said oil circulates, connecting the remote piece of equipment and the X-ray emitting tube, and a device for dehydrating the oil on the other hand, wherein the dehydration device includes means positioned in the circuit through which the oil flows during normal use of said imaging system and which provide or maintain dehydration of said oil during this use.
摘要:
In a method for stabilizing the size of a focal spot of an X-ray tube and contrast modulation function of a X-ray tube, the tube has a cathode comprising a concentrator and a heating filament. It has an anode is placed so as to be facing the cathode. With the filament, the cathode produces an electron beam bombarding the focal spot of the anode. A bias voltage is applied between a terminal of the filament and a terminal of the concentrator. The tube has means to measure the size of the focal spot and the function of contrast modulation. It also has means to regulate the size of the focal spot and the contrast modulation function by means of a bias voltage.