Abstract: A cooling device for a stationary ring surrounding a gas-turbine hot-gas flow path, said ring being made up of a plurality of ring segments that are fastened by upstream and downstream fastener systems onto a plurality of spacer segments forming a support spacer surrounding said ring so as to co-operate therewith to define at least one annular impact cavity into which at least one air supply orifice opens out, each ring segment having walls that are pierced with a plurality of air exhaust holes opening out both into the impact cavity, and into the hot-gas flow path, the device further comprising means for channeling the air coming from leakage through the seals of the fastener systems, and for directing it towards at least one of the axial ends of the ring segments so as to cool said end(s).

Abstract: A device for axially holding a ring spacer sector of a high-pressure turbine of a turbomachine, said spacer sector comprising an upstream radial wall provided with an outer upstream tongue for being engaged in a corresponding upstream groove of a casing of the turbine, and with an inner upstream tongue for being engaged in a corresponding upstream groove of a ring sector, said device comprising a piece of longitudinally-extending sheet metal that constitutes a heat shield disposed upstream from the upstream radial wall of the spacer sector against an inner surface of the casing, the piece of longitudinally-extending sheet metal bearing axially against the upstream radial wall of the spacer sector and being secured to the casing so as to hold the spacer sector axially.

Abstract: A clearance control device for controlling clearance between rotary blade tips and a stationary bushing of a gas turbine having a casing that is provided with at least two annular ridges, the clearance control device including a circular tuning unit that includes air circulation means for circulating air, said means being made up of at least three ducts; air supply means for supplying air to the air flow ducts; and air discharge means for discharging air on the ridges in order to modify the temperature, the air discharge means for each duct being made up of at least one top row having a number N of perforations disposed facing one of the side faces of the ridges and of at least one bottom row having a number 2N of perforations disposed facing a connection radius that connects the ridges to the casing.

Abstract: An ATM network, in which the downward data rate, from the network to the users, is greater than the upward data rate, from the users to the network. Multiplexers are provided for establishing connections, constituting virtual channels, between users and the network; the virtual channels are grouped into virtual paths. In each multiplexer close to the user, the bandwidth allocated to each downward virtual path is variable under the control of a call control means provided upstream in a switching node, and the upward virtual channels have a fixed bandwidth. Preferably, in the downward direction, each virtual channel is assigned a permanent or semi permanent quality of service.

Abstract: Apparatus and methods for communication system-level communication link bonding are disclosed. Multiple communication links provided by transceivers in communication link termination modules are configured as a bonding group to support an aggregate group communication traffic rate on another communication link. Through an internal communication mechanism in communication equipment, communication traffic received on the other communication link is distributed among those of the communication link termination modules which include transceivers for transferring communication traffic on the communication links in the bonding group. The bonding module also receives, from communication link termination modules, communication traffic to be sent on the other communication link.

Abstract: A cooling device for a stationary ring surrounding a gas-turbine hot-gas flow path, said ring being made up of a plurality of ring segments that are fastened by upstream and downstream fastener systems onto a plurality of spacer segments forming a support spacer surrounding said ring so as to co-operate therewith to define at least one annular impact cavity into which at least one air supply orifice opens out, each ring segment having walls that are pierced with a plurality of air exhaust holes opening out both into the impact cavity, and into the hot-gas flow path, the device further comprising means for channeling the air coming from leakage through the seals of the fastener systems, and for directing it towards at least one of the axial ends of the ring segments so as to cool said end(s).

Abstract: A device for axially holding a ring spacer sector of a high-pressure turbine of a turbomachine, said spacer sector comprising an upstream radial wall provided with an outer upstream tongue for being engaged in a corresponding upstream groove of a casing of the turbine, and with an inner upstream tongue for being engaged in a corresponding upstream groove of a ring sector, said device comprising a piece of longitudinally-extending sheet metal that constitutes a heat shield disposed upstream from the upstream radial wall of the spacer sector against an inner surface of the casing, the piece of longitudinally-extending sheet metal bearing axially against the upstream radial wall of the spacer sector and being secured to the casing so as to hold the spacer sector axially.

Abstract: A clearance control device for controlling clearance between rotary blade tips and a stationary bushing of a gas turbine having a casing that is provided with at least two annular ridges, the clearance control device including a circular tuning unit that includes air circulation means for circulating air, said means being made up of at least three ducts; air supply means for supplying air to the air flow ducts; and air discharge means for discharging air on the ridges in order to modify the temperature, the air discharge means for each duct being made up of at least one top row having a number N of perforations disposed facing one of the side faces of the ridges and of at least one bottom row having a number 2N of perforations disposed facing a connection radius that connects the ridges to the casing.

Abstract: In a switching network with a plurality of inlets and outlets and a plurality of interconnected switching nodes having inputs and outputs with respective addresses, a method is described of modifying a first set of outlets to which a cell stream is routed from one of the inlets to a second set of outlets to which this cell stream is to be routed, the addresses of the outputs of each switching node from which the cell stream is output being stored in a routing table of the node. The method includes the steps of transmitting a modification request message to the inlets from each outlet belonging to one but not to both sets and in each switching node receiving the modification request message on one of its outputs, selectively transmitting the request message to the inlets or transmitting a confirmation message to the above each outlet depending on the absence or presence in the node routing table of addresses of node outputs other than the one node output, respectively.

Abstract: A frame for canvas or other cloth is made up of rectilinear sections assembled to form a predetermined polygonal shape having rectilinear sections of channel members (10, 12, 14) having several sides. Each channel member have at least one longitudinal groove (20) along one of the sides thereof. The groove receives the edge of a cloth (28) mounted to the frame. An elonagted tensioner (26) extends around the entire frame and is held securely in the groove (20); the latter being provided with a narrow slit (24).

Abstract: The device controls at least one accessory which operates in an intermittent manner and is driven through a connection by the engine of the vehicle. The latter has a hydraulic steering assistance supplied with fluid under pressure through a delivery pipe by a pump which is driven by the engine through an electromagnetic clutch. A fluid pressure-switch is connected in the electric circuit of the clutch and inserted in the delivery pipe and cuts off the aforementioned connection when the delivery pressure of the pump reaches a predetermined threshold value.