Abstract: An electromagnetic energy momentum thruster has a cavity resonator and an electromagnetic radiation source for emitting an electromagnetic wave in evanescence into the cavity resonator. The electromagnetic wave produces a greater electromagnetic field amplitude and a greater electromagnetic radiation pressure on a primary interior surface area of the cavity resonator than on a secondary interior surface area of the cavity resonator. The difference between the electromagnetic field amplitude on the primary interior surface area and on the secondary interior surface area of the cavity resonator forms a highly directional electromagnetic energy momentum tensor and provides a highly directional general relativistic metric tensor. As a result, a force is produced on the cavity resonator in the form of a thrust or an acceleration that propels the device in a direction substantially perpendicular to the primary interior surface area.

Abstract: An electromagnetic energy momentum thruster has a cavity resonator and an electromagnetic radiation source for emitting an electromagnetic wave in evanescence into the cavity resonator. The electromagnetic wave produces a greater electromagnetic field amplitude and a greater electromagnetic radiation pressure on a primary interior surface area of the cavity resonator than on a secondary interior surface area of the cavity resonator. The difference between the electromagnetic field amplitude on the primary interior surface area and on the secondary interior surface area of the cavity resonator forms a highly directional electromagnetic energy momentum tensor and provides a highly directional general relativistic metric tensor. As a result, a force is produced on the cavity resonator in the form of a thrust or an acceleration that propels the device in a direction substantially perpendicular to the primary interior surface area.

Abstract: The invention relates to a plastic engine cover, as well as to a process for making the plastic engine cover and to an engine comprising the plastic engine cover. The plastic engine cover is made of a glass fiber reinforced thermoplastic polymeric material comprising a polyamide with units derived from terephthalic acid and from diamino butane.

Abstract: The invention relates to a plastic engine cover, as well as to a process for making the plastic engine cover and to an engine comprising the plastic engine cover. The plastic engine cover is made of a glass fibre reinforced thermoplastic polymeric material comprising a polyamide with units derived from terephthalic acid and from diamino butane.

Abstract: An optical device (110) has a substrate (101) with an outer surface (103) and an optical component (117) having a base (115) which interfaces with the outer surface of the substrate. In one embodiment at least one gap (109) is disposed between the outer surface of the substrate and the base of the optical device, the at least one gap containing an adhesive (125) which adheres the substrate and the optical device together and at least one interface (123,133) between the base and the outer surface. In another embodiment a plurality of spaced-apart gaps are disposed between the outer surface of the substrate and the base of the optical device, each gap containing an adhesive which adheres the substrate and optical device together.

Abstract: An aircraft fuel gauging system has a capacitance level probe mounted in a fuel tank that receives an alternating signal from a drive unit. The output of the level probe is connected to two diodes one of which is connected in series to earth and the other of which is connected in the opposite sense to a measuring unit. The measuring unit includes a signal conditioning unit which is switchable between operating as a d.c. current to voltage amplifier and a d.c. voltage amplifier by switching a resistor out of or into series connection with the diodes. A constant current source backs off the current from the probe when the tank is empty. Periodically, the supply of signals from the drive unit is interrupted and the conditioning unit is switched to operating as a d.c. voltage amplifier, the measuring unit measuring the voltage drop across the two diodes caused by current from the constant source.

Abstract: A fuel-gauging system has a capacitive probe mounted in a fuel tank and supplied with an alternating voltage V.sub.s from a drive unit. The output of the probe is rectified by a diode mounted in the tank, prior to supply to a measuring unit. The voltage V.sub.D across the diode varies with temperature and is measured periodically by reducing the input voltage V.sub.s by a known factor X. The voltage V.sub.D is calculated by the measuring unit from the two output currents I.sub.1 and I.sub.2 produced respectively at the two different voltages V.sub.s and V.sub.s /X. The capacitance and hence the depth of fluid is calculated using the known voltage V.sub.D across the diode. The drive unit has a transformer that is used to reduce the voltage periodically by switching between different tappings of its secondary windings.