Abstract: A proportional actuator for proportional control includes a saturation tip formed on the movable armature the solenoid coil is a step-wound coil, providing clearance for the saturation tip, allowing the coaxial diameters the magnetic pole piece and of the armature to be increased for an actuator of a given size so that the amount of force which can be produced by this type of magnetic circuit is related to the coaxial diameters of the magnetic pole piece and the armature, the configuration of the armature provides significantly higher magnetic force attraction between the magnetic pole piece and the armature because of the increased coaxial diameters of the armature and the pole piece. In addition, because of the increased diameter of the armature, the surface area of the armature that is exposed to the saturation tip is increased, thereby increasing the amount of flux that is coupled to the magnetic pole piece by the saturation tip.

Abstract: A method for performing thermotherapy treatment of patient prostate tissue, comprising the steps of inserting a thermotherapy probe in a urethral passageway, the probe having a fluid volume containing portion and an energy source inserted therein for generating radiation to heat the patient prostate tissue by the tissue absorbing the radiation; generating a pressurized fluid flow in the probe within the fluid volume containing portion and cooling the energy source by enveloping at least a portion of the energy source to direct the pressurized fluid flow to come into direct contact with and circulate around and over all energy radiating portions of the energy source simultaneously with energy radiation by the energy source, thereby preventing thereby preventing thermal damage to the energy source; and providing an inflatable nondistensible structure as part of the probe inserted into the urethral passageway and inflating the nondistensible structure with the pressurized fluid flow to cool tissue contacting the

Abstract: A method and apparatus for extracting strontium and technetium values from biological, industrial and environmental sample solutions using a chromatographic column is described. An extractant medium for the column is prepared by generating a solution of a diluent containing a Crown ether and dispersing the solution on a resin substrate material. The sample solution is highly acidic and is introduced directed to the chromatographic column and strontium or technetium is eluted using deionized water.

Abstract: A nonimaging illumination or concentration optical device. An optical device is provided having a light source, a light reflecting surface with an opening and positioned partially around the light source which is opposite the opening of the light reflecting surface. The light reflecting surface is disposed to produce a substantially uniform intensity output with the reflecting surface defined in terms of a radius vector R.sub.i in conjunction with an angle .phi..sub.i between R.sub.i, a direction from the source and an angle .theta..sub.i between direct forward illumination and the light ray reflected once from the reflecting surface. R.sub.i varies as the exponential of tan (.phi..sub.i -.theta..sub.i)/2 integrated over .phi..sub.i.

Abstract: A table is provided having a table top, a table base and coupling means for removable and tiltable coupling said table to said base. The coupling means being releasable and comprising two pair of spring biased elements and receptacles arranged so that the table may be tilted in opposite directions.