摘要:
A method for transmitting a signal from a transmitter over a channel to a receiver on a Power Line Network, wherein said signal is OFDM-modulated on a set of sub-carriers, is proposed, wherein an OFDM tonemap and an eigenbeamforming encoding matrix are determined based on a channel estimation for each sub-carrier, a tonemap feedback signal and an eigenbeamforming feedback signal are generated, which are descriptive of said OFDM tonemap and said eigenbeamforming encoding matrix, respectively, and transmitted to the transmitter. A corresponding receiver, a transmitter, a power line communication and a power line communication system are described as well.
摘要:
A method for transmitting a signal from a transmitter over a channel to a receiver on a Power Line Network, wherein said signal is OFDM-modulated on a set of sub-carriers, is proposed, wherein an OFDM tonemap and an eigenbeamforming encoding matrix are determined based on a channel estimation for each sub-carrier, a tonemap feedback signal and an eigenbeamforming feedback signal are generated, which are descriptive of said OFDM tonemap and said eigenbeamforming encoding matrix, respectively, and transmitted to the transmitter. A corresponding receiver, a transmitter, a power line communication and a power line communication system are described as well.
摘要:
The disclosure concerns a clip having a first shank including a distal end and a proximal end, a head attached to the distal end, a resilient flange attached to the first shank proximate to the proximal end, a second shank extending downwardly from the resilient flange, wherein the second shank includes a free end. A pair of spring members extending obliquely from the free end to the resilient flange, each of the pair of spring members being attached to the resilient flange by a snap-in shoulder, and a pair of longitudinal members extending from the free end and each having a securing element at an opposing end proximate to the resilient flange, wherein the pair of longitudinal members and the securing elements are movable inwardly and outwardly as a result of the pair of spring members flexing inwardly and outwardly, respectively.
摘要:
A fastening device for an electric module is disclosed. The fastening device is adapted for fastening at least one electric conductor unit at an electric module and includes a screw nut compartment adapted to receive a screw nut. The screw nut compartment has an open first side for inserting at least one of the screw nut and a screw. A second side arranged opposite to the first side. The fastening device further includes a stiffening extension formed at the second side of the screw nut compartment, wherein the stiffening extension has a non-circular cross section.
摘要:
Process for obtaining formic acid by thermal separation of a stream comprising formic acid and a tertiary amine (I), in which a liquid stream comprising formic acid and a tertiary amine (I) in a molar ratio of from 0.5 to 5 is produced by combining tertiary amine (I) and a formic acid source, from 10 to 100% by weight of the secondary components present therein are separated off and formic acid is removed by distillation in a distillation apparatus at a bottom temperature of from 100 to 300° C. and a pressure of from 30 to 3000 hPa abs from the liquid stream obtained, the bottom discharge from the distillation apparatus being separated into two liquid phases and the upper liquid phase being recycled to the formic acid source and the lower liquid phase being recycled for separating off the secondary components and/or to the distillation apparatus.
摘要:
Structural adhesives containing a non-rubber-modified epoxy resin, an elastomeric toughener and a curing agent further include an epoxy-functional fatty acid oligomer and a polyol. The presence of the epoxy-functional fatty acid oligomer and a semi-crystalline or crystalline polyester polyol in combination increase the storage stability of the structural adhesive.
摘要:
Structural adhesives are prepared from an elastomeric toughener that contains urethane and/or urea groups, and have some terminal isocyanate groups that are capped with a phenol and other terminal isocyanate groups that are capped with a hydroxy-functional acrylate or a hydroxy-functional methacrylate. In certain embodiments, the presence of both types of capping on the toughener leads to higher impact peel strengths and a greater level of cohesive failure, than when the toughener is capped with a phenol an hydroxy-functional acrylate or hydroxy-functional methacrylate alone.
摘要:
Epoxy adhesive compositions contain an epoxy resin, rubber modification, a toughener and a curing agent. The tougher has capped epoxide-reactive groups, and at least one polytetrahydrofuran block having a mass of 2200-4500 daltons. The selection of toughener in a rubber-modified epoxy-based structural adhesive provides for very good low temperature performance.
摘要:
A linear fluid impulse engine enables efficient conversion of the kinetic energy of large volume flows of fluid at low velocity into useful work. The linear fluid impulse engine is suited for ease of manufacture and installation, is tolerant of suspended abrasives in the fluid, and is fish-friendly. The linear fluid impulse engine uses symmetrically curved blades that are mounted to continuous power transmission belts that revolve on a pair of axles. The blades move in substantially linear paths on both the upstream and downstream sides of the inter-axle plane, which extends between the axes of the shafts. A linear cascade of stationary mid-plane guidevanes, located between the two sets of moving blade cascades, acts as a row of nozzles, accelerating the fluid so that it interacts with the downstream blade cascade with the proper velocity characteristics of an impulse device. Water entering the upstream blade cascade may be accelerated by stationary guidevanes, or the inter-axle plane of the linear fluid impulse engine may be oriented at a selected angle of inclination relative to the inlet fluid flow, to enable impulse operation.
摘要:
The invention relates to a polyurethane reactive composition comprising an isocyanate, an isocyanate reactive polymeric compound and a catalyst for the reaction of the isocyanate with the isocyanate reactive compound. The isocyanate reactive compound is a diol or a higher functional polyol of a polyester, of a polyester polyurethane, of a polycarbonate or of a mixture thereof, the polyester being derived from a hydroxy carboxylic acid or from its corresponding lactone, and the catalyst is a sterically hindered bismuth compound.