Abstract: A liquid power generation apparatus includes a movable liquid tank, a linear-rotation conversion mechanism, liquid introducing device, controlling device, liquid discharging device, liquid tank returning device, and a generator. The movable liquid tank can vertically move. The linear-rotation conversion mechanism includes a male screw shaft and a female screw body and generates a rotation output in tandem with the vertical movement of the movable liquid tank. The liquid introducing device introduces a liquid when the movable liquid tank is provided at an upper position. The controlling device moves down the movable liquid tank having the liquid therein from the upper position. The liquid discharging device discharges the liquid when the movable liquid tank is lowered. The liquid tank returning device moves up the lowered movable liquid tank and returns it to its original position. The generator generates electricity by using a rotation output from the linear-rotation conversion mechanism.

Abstract: A liquid power generation apparatus comprises a movable liquid tank, a linear-rotation conversion mechanism, liquid introducing means, controlling means, liquid discharging means, liquid tank returning means, and a generator. The movable liquid tank can vertically move. The linear-rotation conversion mechanism comprises a male screw shaft and a female screw body and generates a rotation output in tandem with the vertical movement of the movable liquid tank. The liquid introducing means introduces a liquid when the movable liquid tank is provided at an upper position. The controlling means moves down the movable liquid tank having the liquid therein from the upper position. The liquid discharging means discharges the liquid when the movable liquid tank is lowered. The liquid tank returning means moves up the lowered movable liquid tank and returns it to its original position. The generator generates electricity by using a rotation output from the linear-rotation conversion mechanism.

Abstract: A hydraulic generating apparatus which has a simple configuration and can be readily adapted to various water sources and various electric generating capacities including a float that floats on a water surface in a water tank and a linear-rotation conversion mechanism that converts linear movement into rotational movement, and a hydraulic generating system using this apparatus.

Abstract: According to one embodiment, an information processing system includes a plurality of information processing devices connected to one another and capable of transmitting/receiving data to/from one another. One information processing device includes a determiner configured to determine whether an address level included in a transmission signal transmitted from another information processing device is for specifying the one information processing device based on information on the address level, and a data receiver configured to receive real data included in the received transmission signal when the determiner determines that the address level is for specifying the one information processing device.

Abstract: A delay circuit which compensates for a variable phase output of an index signal by delaying the read out index signal. The delay time of the delay circuit depends on the cylinder on which a read/write head is located, and is chosen so that the delayed index signals are generated at an essentially constant phase angle with respect to a reference angular position. The delay circuit may include a counter which is pre-loaded with an address of the cylinder on which the head is located, and which counts number of clock pulses input to the counter. Overflowing of the counter generates the compensated index signal. Thus, synchronous operation of plural disk apparatus is accomplished, when the head seeks a new cylinder.

Abstract: A system for driving a constant current drive type DC motor a which enables the supply of a low power to switching elements in a constant current drive circuit therein during, and in particular, at start-up of the motor. The DC motor drive system includes a DC motor, a unit for detecting a rotation of a rotor of the motor, a power supply unit for supplying a drive power to the motor, and a current drive circuit providing a constant current passing through a coil of the motor supplied with the drive power during a normal operation of the motor. The power supply unit sequentially increases a voltage therefrom in multi-steps in response to the increase of the rotation during a start-up operation. The power supply unit may change the voltage supplied therefrom so that a maximum value of the current is sequentially increased during the start-up.