Abstract: An auxiliary propulsion apparatus of an air vehicle may include an engine mounted in a fuselage of the air vehicle, a generator configured to be driven using power from the engine, a compressor configured to be driven by the engine or the generator, a battery configured to store electricity generated by the generator, an electricity distributor connected to the generator, the battery and the main propulsion apparatus and configured to distribute electricity generated by the generator to the battery and to a main propulsion apparatus, and at least one nozzle device configured to jet high-pressure gas, supplied from the compressor, to an outside of the fuselage.

Abstract: Disclosed is a positive electrode material for a lithium secondary battery. The positive electrode material includes a positive electrode active material formed of Li—[Mn—Ti]-M-O-based material including a transition metal (M) to enable reversible intercalation and deintercalation of lithium and molybdenum oxide. The positive electrode active material is coated with the molybdenum oxide to form a coating layer on a surface thereof.

Abstract: A tandem master cylinder comprising first and second oil chambers having first and second pistons and first and second springs disposed in each of said respective chambers, the second piston being connected with a hydraulic push rod; a bypass chamber; and two one-way valve means mounted at one side of the bypass tube and in the body of the first piston for establishing one-way oil flow passage from the second chamber to the first chamber and then to the second chamber. The tandem master cylinder allows the braking power increasing ratio between the front wheels and the rear wheels to follow a nonlinear curve for improving braking efficiency.

Abstract: A thermostat device includes a housing having an inlet port and an outlet port. A valve seat is disposed in the housing and has an aperture therein. A first valve opens and closes the aperture under the control of a temperature sensitive device. The temperature sensitive device senses a temperature of fluid supplied to the inlet port, and controls the operation of the first valve based on the sensed temperature. The thermostat also includes a fail safe structure which allows the fluid supplied to the inlet port to flow through a portion of the aperture when the temperature sensitive device malfunctions.

Abstract: An intake port device for an engine of a vehicle includes a cylinder head having an intake port therein, an intake valve, disposed at an end of the intake port leading to an engine cylinder, for opening and closing the intake port, and a cross-section controller for controlling a cross-sectional area of a portion of the intake port. The cross-section controller includes an elastic member disposed about an inner wall of the intake port, and a movable member forming a portion of the inner wall of the intake port. The movable member may be a hydraulically controlled piston which moves according to the speed of the engine so as to change the cross-sectional area of the intake port; thus, properly and effectively generating a swirling air flow to improve combustion within the engine.