Abstract: A method of setting up the required running tolerances in a gerotor pump having annulus and rotor meshed together and located in a body comprises pressing a cover plate (FIG. 1) or equivalent as an interference fit into the body and then allowing it to relax and recover elastically to set up the required tolerances at axial ends of the gerotor set.

Abstract: A water pump has a bowl like body and a seal across the rim of the body. Coolant leakage through the seal is used to wet the rubbing faces of the seal. Superfluous leakage is collected in the bowl so that it may be evaporated by engine heat.

Abstract: A gerotor pump has a rotatable, lobed rotor with n lobes meshed with a rotable lobed annulus with n+1 lobes, the two being conjointly and relatively rotatable about parallel axes. The lobes of both the rotor and the annulus spiral helically to smooth pressure peaks and reduce noise.

Abstract: A gerotor set (FIG. 1) has grooves 108 extending across the end face of the annulus adjacent the outlet port so as to allow flow from each chamber in turn into the outlet at a time when the chamber per se is not yet registered with the outlet, so as to prevent noise due to the trapped volume being compressed when it is unable to escape into either port.

Abstract: A method of casting a water pump impeller which initially includes the formation of a foam pattern incorporating a former which remains as a part of the impeller, the foam pattern being used to form a mold in which the impeller is cast accompanied by the destruction of the foam pattern.

Abstract: A laser apparatus for inverting a population in an atomic or molecular species is provided. Energy is stored in a first species and a laser induced collisional energy transfer from that first species to a selected dissociative molecular state of a second species causes an inversion of one of the constituents of the second species. This is represented, in one embodiment of the present invention which utilizes a second species comprising a diatomic molecule, by the reactionA*+BC+h.nu..fwdarw.A+(BC)*.fwdarw.A+B*+C,where A and A* are the ground and excited states of the first species respectively, denoted as the storage species, BC and (BC)* are the ground and excited states of the second species respectively, which comprises atoms B and C, and B* is the excited state of atom B, which excited state is inverted.

Abstract: A cw laser beam of radiation superimposed upon a beam of particles, for example a beam of neutral particles, can cause substantial changes in particle trajectories when the radiation frequency is tuned near a resonant transition in the particle. The particles can be confined by, ejected from, or steered by the laser beam. The present invention teaches the range of values over which the frequency of electromagnetic radiation is to be offset from the frequency of a particle resonance, as a function of radiation power for specific wave propagation modes, to produce best focusing of the particle beam by a copropagating beam of electromagnetic radiation. Our invention takes into account the effect of random fluctuations which arise out of the quantum nature of the electromagnetic wave-particle interaction in order to determine the appropriate range of values.

Abstract: The present invention relates to an apparatus for providing second harmonic generation from a single beam in an isotropic medium. An isotropic medium having a two-photon transition between a first level and a second level with a quadrupole moment therebetween is exposed to a beam of laser radiation. The photons in the laser beam have an energy which is substantially equal to one-half the energy difference between the first and second levels.

Abstract: Atoms of hydrogen or deuterium are fully ionized by a three-photon process which is enhanced by the two-photon 1S.fwdarw.2S resonant transition. The resultant ions are detected with high efficiency to provide discrimination between small concentrations of atomic hydrogen and atomic deuterium in a vacuum or in the presence of a background gas. The use of two unequal photo energies to pump the two-photon resonance provides the capability of mapping the individual three dimensional distribution of the hydrogen or deuterium. The detection process is also appropriate to determining these data in dishcarge plasmas and flames.