摘要:
A thermophotovoltaic converter of the type comprising a concentrating optical system and a transducer for solar radiation provided with at least one lens and with at least one photovoltaic cell is described.The principal feature of this converter is that the aforementioned transducer comprises at least a radiator having an irradiating surface substantially facing the sensitive surface of the photovoltaic cell and a selective filter disposed between the photovoltaic cell and the aforementioned radiator.
摘要:
A solar energy absorber comprises a thermally-insulated duct housing a plurality of longitudinally-extending absorbing plates and having a slit located at the focal axis of an elongate, optical focusing system. The plates are parallel to the plane of symmetry of the optical system and are spaced apart such that focused energy incident through the slit falls upon an entire surface of each plate, any reflected energy being returned to the plates by a plane mirror located on the opposite side of the plates from the slit and by internal reflecting surfaces of the duct such that substantially all the energy is absorbed: this energy is given up to an air flow through the duct, in use.
摘要:
A tyre (3) for vehicles, which does not require pressurisation by means of a pressurised fluid, has a tread (16), two sidewalls (15), and two beads (8) attached to a wheel rim (2) and made of elastomer material; the tyre is provided with at least one tubular reinforcement body (18) which is associated with the tread; each of the sidewalls have a respective homogeneous resilient annular membrane (24).
摘要:
A system for monitoring a state of operation of a photovoltaic panel. The system comprises a transponder for connection to the panel, wherein, when the panel is in a first state of operation, the transponder transmits an individual identifier code in response to a pre-determined received signal and wherein, when the panel is in a second state of operation, the transponder does not transmit the individual identifier code.
摘要:
There is disclosed an electromagnetic actuator which is provided with an electromagnet and a movable core which can be attracted by the electromagnet. The electromagnet is formed by a small plate having on its front surface facing the core a plurality of grooves in which are housed respective substantially rectilinear conductor elements. The conductor elements are electrically connected together in such a way as to define on the surface a plurality of elementary magnets disposed alongside one another and having alternately opposite polarity.
摘要:
An electrical distribution system suitable for use on motor vehicles where electric current is to be supplied selectively to one or more electric power consuming devices, wherein there is provided a main power carrying conductor and a plurality of signal carrying lines which energize one or more of a plurality of actuators to interconnect the power line to a selected electrical device, in which the power line is in the form of a metal strip of sufficient rigidity that the actuators can be mounted thereon by a mounting which also makes electrical contact thereto.
摘要:
An electromagnetic angular speed or angular position transducer comprises a permanent magnet with closely spaced pole faces and a ferromagnetic core magnetically connected to the magnet and carrying a coil. The transducer cooperates with a toothed wheel the teeth of which are moved past the pole faces and the core in such a way that two magnetic circuits are completed by the teeth, one passing through the teeth and the two pole faces, and the other passing through the teeth and the core. The two magnetic circuits are in parallel with one another and the reluctance of each changes as the teeth move therepast. The circuit through the two pole faces ensures that the magnet is operated with a high leakage flux so that small changes in the reluctance cause relatively large flux changes and thus a relatively high electromotive force in the coil wound about the core.
摘要:
A photovoltaic receiver comprising an elongated structure bearing a plurality of photovoltaic cells. Said structure carries a plurality of finned dissipators, mounted on which are said photovoltaic cells, and ventilating means, designed to convey a flow of cooling air towards said dissipators.
摘要:
A safety barrier for road use comprises a barrier element (5) which can be displaced between an operative position, above the road surface, and an inoperative position, in which it does not substantially project above the road surface. Preferably provided is a number of sets of aligned barrier elements, rigidly connected to one another, the adjacent sets being connected together by articulated connecting structures (18) which enable one set of barrier elements (5) to be displaced between its inoperative position and its operative position without modifying the positions of the adjacent sets. In this way, one or more stretches of the barrier can be brought into the inoperative condition, leaving the adjacent stretches of barrier in the normal operative condition. The invention is particularly, although not exclusively, suited for the construction of traffic-divider barriers in road tunnels where it is necessary to eliminate the barrier rapidly in the event of an accident occurring.
摘要:
Starting from a sequence of values of indicated torque detected for each expected combustion in the engine a cycle signal is generated as a combination of at least two successive values of the said sequence. The peak value of the said cycle signal is then compared with a comparison threshold chosen preferably in proportion of the fuel injection duration into the cylinders. Misfires are identified preferably from the result of a comparison between the said peak value and the said comparison threshold which differs from the result of comparison in the presence of regular operation of the engine.