摘要:
A pulse combustor has a casing in which a combustion chamber is defined. Air is supplied to the combustion chamber through an air supply pipe. A valve mechanism for controlling the air supply to the chamber is provided in the air supply pipe. The valve mechanism has a base plate with a plurality of air supply holes for the passage of air, and a flapper valve for opening and closing the air supply holes in accordance with the change of pressure inside the chamber. The flapper valve is composed of a plurality of ring-shaped segments with different diameters. These segments are arranged concentrically with one another.
摘要:
A pulse combustor comprises a throttle plate provided in a cylindrical body for dividing the interior of the body into a combustion chamber and a mixture chamber and having a throttle hole, gas suction holes communicating with the combustion chamber, air suction holes communicating with the combustion chamber, igniting plug provided in the combustion chamber for explosing and burning the mixture gas of the air and the fuel gas therein, and valve plate provided in the mixture chamber for shutting off the communication of the gas suction holes and air suction holes with the mixture chamber when the pressure in the mixture chamber becomes positive as the mixture gas is exploded and burnt and enabling the communication when the pressure in the mixture chamber becomes negative.
摘要:
In a pulse burner of the type wherein an air-fuel mixture in a combustion chamber is explosively burnt by an ignition plug and resulting flame is detected by a flame detector to control the operation of the pulse burner, there is used a flame detector which detects electric current flowing in the flame instead of a thermostat secured to a side wall of the combustion chamber.
摘要:
One object is to propose a memory device in which a period in which data is held can be ensured and memory capacity per unit area can be increased. The memory device includes a memory element, a transistor including an oxide semiconductor in an active layer for control of accumulating, holding, and discharging charge in the memory element, and a capacitor connected to the memory element. At least one of a pair of electrodes of the capacitor has a light-blocking property. Further, the memory device includes a light-blocking conductive film or a light-blocking insulating film. The active layer is positioned between the electrode having a light-blocking property and the light-blocking conductive film or the light-blocking insulating film.
摘要:
An object of the present invention is to provide a highly reliable power supply device which can withstand long-term use. Another object of the present invention is to provide a power supply device with reduced power consumption. The power supply device includes a cell including an antenna and a switch and performing position detection operation and power feeding operation; a high-frequency wave supply circuit; a switch control circuit; and a potential detecting circuit. One electrode of the antenna is connected to the high-frequency wave supply circuit through the switch, and the other thereof is connected to the potential detecting circuit. By the position detection operation, whether there is a power receiving device which gets close to a cell or not is detected. Only when the power receiving device is detected, power is supplied by the power feeding operation.
摘要:
A method for driving a semiconductor memory device including a transistor with low leakage current between a source and a drain in an off state and capable of storing data for a long time is provided. In a matrix including a plurality of memory cells in each of which a drain of a write transistor, a gate of an element transistor, and one electrode of a capacitor are connected, a gate of the write transistor is connected to a write word line, and the other electrode of the capacitor is connected to a read word line. The amount of charge stored in the capacitor is checked by changing the potential of the read word line, and if the amount of charge has decreased beyond a predetermined amount, the memory cell is refreshed.
摘要:
When writing into an antifuse memory element finishes, a value of resistance of the memory element rapidly decreases; accordingly, an output voltage of a boosting circuit which produces a writing voltage rapidly decreases. By detecting a change in the output voltage of the boosting circuit to control a writing command, the writing operation can be stopped immediately after the memory element is shorted. Thus, unnecessary current consumption caused by continuing a writing operation on the shorted memory element can be suppressed.
摘要:
To increase a storage capacity of a memory module per unit area, and to provide a memory module with low power consumption, a transistor formed using an oxide semiconductor film, a silicon carbide film, a gallium nitride film, or the like, which is highly purified and has a wide band gap of 2.5 eV or higher is used for a DRAM, so that a retention period of potentials in a capacitor can be extended. Further, a memory cell has n capacitors with different capacitances and the n capacitors are each connected to a corresponding one of n data lines, so that a variety of the storage capacitances can be obtained and multilevel data can be stored. The capacitors may be stacked for reducing the area of the memory cell.
摘要:
A semiconductor device which includes an oxide semiconductor and has favorable electrical characteristics is provided. In the semiconductor device, an oxide semiconductor film and an insulating film are formed over a substrate. Side surfaces of the oxide semiconductor film are in contact with the insulating film. The oxide semiconductor film includes a channel formation region and regions containing a dopant between which the channel formation region is sandwiched. A gate insulating film is formed on and in contact with the oxide semiconductor film. A gate electrode with sidewall insulating films is formed over the gate insulating film. A source electrode and a drain electrode are formed in contact with the oxide semiconductor film and the insulating film.
摘要:
A structure of a storage device which can operate memory elements utilizing silicide reaction using the same voltage value for writing and for reading, and a method for driving the same are proposed. The present invention relates to a storage device including a memory element and a circuit which changes a polarity of applying voltage to the memory element for writing (or reading) into a different polarity of that for reading (or writing). The memory element includes at least a first conductive layer, a film including silicon formed over the first conductive layer, and a second conductive layer formed over the silicon film. The first conductive layer and the second conductive layer of the memory element are formed using different materials.