Abstract: A semiconductor memory device comprises eight memory arrays (b 10a, 10b) arranged in one column. A peripheral circuit (60) is arranged in the central portion of the eight memory arrays (10a, 10b), two column decoders (51, 52) being arranged with the peripheral circuit (60) interposed therebetween. Each of the eight memory arrays (10a, 10b) is provided with a row decoder (20). A plurality of first column selecting lines (CL1) are provided so as to cross the three memory arrays (10a, 10b) arranged on one side of the peripheral circuit (60) from the column decoder (51). In addition, a plurality of second column selecting lines (CL2) are provided so as to intersect with the three memory arrays (10a, 10b) arranged on the other side of the peripheral circuit (60) from the column decoder (52).

Abstract: An air conditioning apparatus having a cold accumulating cycle including a first compressor, a first condensor, a first decompressing mechanism and a heat accumulator and a refrigerating cycle including a second compressor, a second condensor, a second decompressing mechanism and an evaporator, wherein the heat accumulating cycle and the refrigerating cycle are provided independently of each other and in that a cooling device using the evaporator as cooling means serves for cooling by utilizing heat accumulated in the heat accumulator thereby constituting a cold transfer circuit.

Abstract: There is disclosed a corona discharger comprising a discharge wire for producing a corona discharge, a voltage source for applying a predetermined voltage to the discharge wire, an electrically conductive back plate being provided on the opposite side of the discharge wire to a member to be electrified, and an electrically conductive side plate being provided close to the member to be electrified. In the corona discharger, an opening for discharging ozone produced by said corona discharge is formed between said side plate and said back plate, and respective electric potentials of the side plate and the back plate are set so that a difference between respective electric potentials of the side plate and the discharge wire becomes lower than a difference between respective electric potentials of the back plate and the discharge wire.

Abstract: A memory cell array (10) is divided into four blocks. Each block comprises a memory cell array block (10aand a memory cell array block (10b). A sense amplifier block (20) is disposed between the memory cell array blocks (10a) and (10b). Each sense amplifier block (20) is connected to the memory cell array blocks (10a) and (10b) via switching circuits (80a, 80b), respectively. Four decoders (51) are provided corresponding to the four blocks. The four decoders (51) are commonly provided with a driver (52) generating a high level driving signal. Each decoder (51) is responsive to an address signal for supplying a driving signal from the driver (52) to either one of the switching circuits (80a, 80b) and for applying a ground potential to the other one of the circuits. Accordingly, the sense amplifier block (20) is connected to either one of the memory cell array blocks (10a, 10b ).

Abstract: An input signal is inverted by a CMOS inverter and provided for an output signal line. The CMOS inverter is provided between a power supply and a ground, and its node on the side of the power supply is charged all the time to prevent the potential thereof from being lowered. An output signal provided for the output signal line is delayed by a delay circuit to be applied to a boosting capacitor. The potential of the node is further boosted by this boosting capacitor. Consequently, the potential of the output signal is also boosted. When the potential of the node is raised higher than a supply voltage, an N channel MOSFET for charging is turned off to prevent a reverse flow of a charge.

Abstract: A dynamic random access memory with self-refresh function, which includes a substrate bias generator (100) adapted to be intermittently driven to apply a bias potential to a semiconductor substrate (15). This memory device comprises a circuit (91) for generating an internal refresh instruction signal (.phi..sub.S) in response to an external refresh instruction signal, a circuit (92, 93) which, in response to the internal refresh instruction signal, generates a refresh enable signal (.phi..sub.R) intermittently at a predetermined interval, a circuit (94, 95, 96, 98) which, in response to the refresh enable signal, refreshes data in the memory cells, and a circuit (99) which, in response to the internal refresh instruction signal and refresh enable signal, activates the substrate bias generator in the same cycle as the cycle of generation of the refresh enable signal and only for a time shorter than the cycle of generation of the refresh enable signal.

Abstract: An air conditioning system for buildings includes a plurality of air conditioners on the different floors, a cooling gravity type heat pipe connecting vaporizers in the air conditioners with a cold thermal source installed at the top of the building and a warming gravity type heat pipe connecting a condenser of the air conditioners with a hot thermal source installed in the basement of the building. The heat pipes are, respectively, provided with flow control valves at the inlet of each vaporizer and the outlet of each condenser. Each air conditioner is provided with a thermistor for detecting the temperature of the returning air and a liquid level detection switch for detecting the liquid level of the thermal medium in the vaporizer. The flow control valves are respectively controlled based on the detection signals issued by the thermistor and the liquid level detection switch.

Abstract: An air conditioning system for a building according to the present invention essentially has a first thermal storage tank as a cold thermal source which is installed at a high place in the building, a second thermal storage tank as a hot thermal source which is installed at a low place in the building, air conditioners which are installed at various levels between the first thermal storage tank and the second thermal storage tank, and heat pipes of a gravity type with which the air conditioners are connected to the first thermal storage tank and the second thermal storage tank. This system dispenses with passages for water, typically used as a thermal medium, at the places where air conditioners are installed. The system makes it possible to lower the capacities of the air conditioning equipment, especially the capacity of the regrigerator included in the cold thermal source equipment.