摘要:
The invention concerns a concrete obtained by mixing with water, cement, granular elements, elements with puzzolanic reaction, constituents capable of improving the toughness of the matrix, metal fibers and at least a dispersing agent, in specified conditions and proportions. Said concrete has improved properties compared to prior art concrete comprising metal fibers.
摘要:
When decoding a set of symbols to be decoded, several data blocks representative of the set of symbols to be decoded are received by a decoding node of a communications network. The data blocks are encoded using an error correction code enabling a decoding by erasure. The decoding node performs the following steps: first selecting at least one of the data blocks, first determining first erasures, and checking whether the number of the first erasures is below a given threshold. In a case the check is positive, the decoding node performs first decoding by erasure of the set of symbols to be decoded. In a case the check is negative, the decoding node performs second selecting of at least one of the data blocks, second determining second erasures, and second decoding by erasure of the set of symbols to be decoded from the second erasures.
摘要:
The invention concerns a method for accessing a medium by a transmit node in a synchronous communications network comprising a plurality of nodes capable of accessing said medium during access time slots of predetermined duration to transmit data frames via said network. The plurality of nodes comprises a master node that implements a clocking that defines a network cycle for accessing said medium and comprises at least two slave nodes being slaves of said clocking including said transmit node. Each network cycle comprises a plurality of frames transmitted during said access time slots according to a predetermined transmission sequence.According to the invention, the transmit mode performs the following steps: receiving at least one frame coming from at least one of the other nodes of the network; from each frame received, obtaining synchronization information pertaining to a level of synchronization of the node having sent said frame, said level of synchronization being relative to the master node; selecting a reference node from the node(s) from which at least one frame has been received, as a function of said pieces of synchronization information; determining a start of access time slot from the positions in said transmission sequence of the frames associated with the reference node and with said slave node; and accessing said medium at said determined start of access time slot.
摘要:
The invention relates to a method for allocating at least one identifier known as routing identifier to at least one bridge (1002, 1008, 1009, 1010, 1012) of a network (1000), the said bridge comprising at least two interconnection equipment (1021, 1035) a first (1021) of which is connected to at least one first part (1014) of the said network, characterised in that each one of the interconnection equipment of the said bridge being in a “state” determined by reference to the allocation of an identifier to this interconnection equipment, the said method includes the following steps: determination (1041, 1042; 1051, 1052, 1053; 1056, 1057) of at least one “state” which corresponds to the “state” of the said at least one second interconnection equipment of the said bridge, deciding (1044; 1054; 1059) as to the allocation of an identifier to the at least one first interconnection equipment of the said bridge as a function of the said at least one determined “state”.
摘要:
The invention relates to a method of data-packet transmission from a first network to a second network, one of the networks being a communications bus transporting data packets of isochronous and asynchronous types, characterised in that, with the other network being a packet-switching network, the said method includes, performed within a communications device connected to the communications bus and forming part of the packet-switching network, a step of reserving resources adapted to the types of data packets intended for the second network.
摘要:
The invention relates to a method for allocating at least one identifier known as routing identifier to at least one bridge of a network, the bridge comprising at least two interconnection equipment a first of which is connected to at least one first part of the said network, characterized in that each one of the interconnection equipment of the said bridge being in a “state” determined by reference to the allocation of an identifier to this interconnection equipment, the method includes the steps of determination of at least one “state” which corresponds to the “state” of the at least one second interconnection equipment of the bridge, and deciding as to the allocation of an identifier to the at least one first interconnection equipment of the bridge as a function of the at least one determined “state”.
摘要:
The invention relates to aqueous suspensions of precipitated silica and of aluminum sulphate which have a pH lower than 4 and a solids content of between 10 and 50% by weight and which, after a period at rest of 48 hours, are in the form of a gel. The gel is reversible under low shear. The invention also relates to processes for the preparation of these suspensions and to their uses, especially in the field of cement mixes, mortars and concretes.
摘要:
The invention relates to a self-levelling fluid mortar including calcium sulphate, granulates, lime, water and either a silica and a compound containing alumina or a pozzuolana, and to a screed obtained from said fluid mortar. It also relates to the combined use of lime and either of a silica and of a compound containing alumina or a pozzuolana to increase the mechanical strength and reduce the water sensitivity of a screed.
摘要:
A process for spraying concrete or mortar, by a dry route or by a wet route, in order to produce on a surface a layer of concrete or of mortar. Just before or at the time of spraying, an aqueous suspension (A) of silica and of an aluminum compound chosen from aluminum sulphate, basic aluminum sulphates, alums and mixtures thereof is added to the concrete or mortar. The aqueous suspension (A) has a pH lower than 4, a solids content of between 10 and 50% by weight, and, after a period at rest of 48 hours, is in the form of a gel which is reversible under low shear. The aqueous suspension (A) is effective for increasing the thickness of the sprayed layer and reducing rebound of the concrete or mortar sprayed onto the surface.
摘要:
The invention relates to a gel made of apolar medium including:an apolar medium,a "multichain" liquid surface-active agent in acidic form, soluble or dispersible in the said apolar medium,an agent for neutralizing the said "multichain" surface-active agent,from 0.2 to 5 molecules of water per molecule of "multichain" surface-active agent,optionally at least one emulsifying agent and/or a solid filler which is soluble or insoluble in the apolar medium.This gel may be employed for the formulation of water-based drilling fluids.