A feedback loop is provided within an inverter feedback control system for modifying reference voltage to effect modifying output voltage from the inverter circuit thereby to maintain constant average rectified resistive current to a complex load, compensating for variations in load current which result from a changing characteristic of the complex load.

Precision gas pressure regulation is disclosed to provide extreme sensitivity, fast response, and positive shut-off of gases for pressurizing a vessel, such as a tank, pressurized room, chamber, duct, and the like, at pressures up to about 2 inches of water column above atmospheric pressure, and as low as about 0.25 inches of water column, with control of pressure within about 0.02 inches of water column within a predetermined pressure within this range. The system is compact, self-contained, an...

A gate/loading arrangement which balances applied gate force betweem the edges of tow being crimped in a stuffer box crimper. A single hinged gate has been replaced with two or three equal sized gates and force is applied to the gates from an air cylinder through a pivotal linkage.

This invention relates to an apparatus and method for regulating the exposure of active surfaces by covering the surface with an erodible protection coating. The rate of erosion is controlled by chemical and/or physical means so that the surface is progressively and gradually exposed.

1,2,2-Trihalocyclopropane 1-carboxylic acids and derivatives thereof are useful in regulating the growth and flowering of plants when applied as a foliar spray or as a post emergent or pre-emergent soil treatment.

The invention provides a pump regulation device. It is characterized in that the device (21) comprises: means for recording the real pressure (24) and a reference pressure, means, on the one hand for comparing the real pressure (24) in the organ and the reference pressure and, on the other hand, for emitting a signal proportional to the error, ports controlling the threshold of this error signal, an alarm controlled by the signal passing through at least one of said ports.

Hemodialysis ultrafiltration apparatus comprises a hemodialyzer, a supply line for supplying fresh dialysate to the hemodialyzer. A drain line is provided for removing spent dialysate from the hemodialyzer. The dialyzer is adapted to be connected to a patient so that the patient's blood may be supplied to and removed from the hemodialyzer. A weighing mechanism allows a fixed amount of fresh dialysate, by weight, to flow through the hemodialyzer. Spent dialysate emerging from the hemodialyzer is ...

A pressure regulator including high and low pressure chambers separated by a divider having an opening, a closing member biassed to a closing position for closing the opening with a biassing force according to a desired pressure differential between the chambers, and a damping device for damping the resulting force on the closing member. There is also disclosed a fluid drainage system having a suction chamber with a suction regulator, and various arrangements of diaphragms for measuring pressure...

A method is disclosed for producing catabolite repression-resistant mutant strains of C. thermosulfurogenes and C. thermohydrosulfuricum. The method comprises challenging a wild strain of the organism with nitrosoguanidine, followed by enrichment on 2-deoxyglucose and culturing an iodine stained starch-glucose containing agar. The colonies which convert starch most efficiently are catabolite repression-resistant. Pure cultures of the mutants and methods employing the mutants to prepare enzymes a...

A regulatable vane pump is provided with a piston operable by differential pressure responsive to booster steering flow demand wherein the piston movement controls a choke bore flow area. The differential pressure is effected by pump pressure on one face of the piston and consumer pressure on the opposite face of the piston, e.g., pressure in a booster steering servomotor. The choke bore has an aperture covered or uncovered by a choke plate carried by a pin on the piston. The choke plate is norm...