Abstract: A propulsion system for providing propulsion of an aircraft includes a plurality of electric motors coupled with a rotor of the aircraft to drive the rotor and a propulsion motor control. The propulsion motor control includes at least one processor electrically connected with at least one electric motor to actuate the at least one electric motor and at least one battery electrically connected with the at least one processor and at least one electric motor to provide power to the at least one processor and the at least one electric motor. The propulsion motor control actuates the plurality of electric motors based on a desired torque level to drive the rotor to provide propulsion of the aircraft.

Abstract: A propulsion system for providing propulsion of an aircraft includes a plurality of electric motors coupled with a rotor of the aircraft to drive the rotor and a propulsion motor control. The propulsion motor control includes at least one processor electrically connected with at least one electric motor to actuate the at least one electric motor and at least one battery electrically connected with the at least one processor and at least one electric motor to provide power to the at least one processor and the at least one electric motor. The propulsion motor control actuates the plurality of electric motors based on a desired torque level to drive the rotor to provide propulsion of the aircraft.

Abstract: A walker adapted to navigate stairways and inclined surfaces is provided.

Abstract: 6-Amino-5-halo-4-pyrimidinecarboxylic acids having poly-substituted aryl substituents in the 2-position, and their amine and acid derivatives, are potent herbicides demonstrating a broad spectrum of weed control.

Abstract: 6-Amino-5-halo-4-pyrimidinecarboxylic acids having poly-substituted aryl substituents in the 2-position, and their amine and acid derivatives, are potent herbicides demonstrating a broad spectrum of weed control.

Abstract: A system for controlling flight of an aircraft has sensors (37, 43), a receiver (45), and a digital control system (57), all of which are carried aboard the aircraft. The sensors (37, 43) determine the position of the aircraft relative to the earth and the inertial movement of the aircraft. The receiver (45) receives transmitted data (51, 55) communicating the position and movement of a reference vehicle relative to the earth. The control system (57) calculates the position and velocity of the aircraft relative to the reference vehicle using the data from the sensors (37, 43) and the receiver (45) and then commands flight control devices (33) on the aircraft for maneuvering the aircraft in a manner that maintains a selected position and/or velocity relative to the reference vehicle. The system allows use of a graphical or tactile user interfaces.

Abstract: The invention provides methods and compositions for polymerizing a particular nucleotide with a polymerase. In general, the method involves (a) forming a mixture of a polymerase and a nucleoside triphosphate (NTP) comprising &agr;, &bgr; and &ggr; phosphates and a &ggr;-phosphate phosphoester-linked functional group; and incubating the mixture under conditions wherein the polymerase catalyzes cleavage of the NTP between the &agr; and &bgr; phosphates, liberating a pyrophosphate comprising the functional group and polymerizing the resultant nucleoside monophosphate, i.e. incorporates the nucleoside monophosphate in a nascent polynucleotide. A variety of functional groups compatible with the polymerization reaction are provided.