Abstract: A plate structure block for establishing a surface layer ground is formed integrally with an iron plate on an upper surface of a reinforced concrete member. A lift metal fittings for transporting the block is installed on the block. The surface layer ground establishment block has a large ground bearing pressure and is a portable block. This block is covered on the surface layer ground and establishes the ground for operating a heavy material machinery and/or for maintaining a heavy material member. By operating a mobile heavy crane on the established ground, the working for constructing a plant is carried out. The material for constructing the ground is reused, the shape of the ground site is easily changed, and the dismantling and removal of the ground is simplified.

Abstract: A sewage treatment system is provided for cleaning sewage by filtering solid components in the sewage through use of a floating filter medium, wherein the filtration performance can be improved and the filtration cleaning can be performed efficiently. The sewage flows upwardly in the treatment tank and is filtered through the floating filter media layer made of cylindrical mesh floating filter media which have a smaller specific gravity than the sewage. To wash the floating filter medium, air is jetted from the air jetting pipes to generate a circular flow to scape off solid components adhering to the filter medium. Then the waste, which has washed the floating filter medium is discharged to the outside of the treatment tank while the air is jetted from the air jetting pipe for full jetting of the floating filter media layer unidirectionally.

Abstract: A sewage treatment system is provided, for cleaning a sewage by filtering solid components in the swage through floating filter medium, wherein the filtration performance can be improved and the filtration cleaning can be performed efficiently. The sewage 18 is flowed into the treatment tank 12 in upward-flow, and filtered through the floating filter media layer 22 made of the meshy cylindrical floating filter medium 20 which have smaller specific gravity than the sewage 18. To wash floating filter medium 20, the air is jetted from the air jetting pipe 54 and the revolution flow is generated to scale solid components adhering to filter medium, and then the sewage 18, which has washed the floating filter medium 20, are discharged to the outside of the tank 12 while the air is jetted from the air jetting pipe 56 for full jetting to jet the floating filter media layer 22 in whole.

Abstract: A heat storage apparatus includes a tank containing a heat storage medium and having an upper region and a lower region for holding the heat storage medium at respective temperatures above and below atmospheric temperature. To reduce heat losses and increase flexibility of use, an intermediate region having heat storage medium is maintained in the tank between the upper and lower regions at a temperature between the upper and lower temperatures. The desired temperature of the intermediate region is maintained by heating or cooling its heat storage medium, for example by use of an otherwise unused low-grade heat source.

Abstract: Fluorine is recovered as calcium fluoride from a fluoroetchant solution composed mainly of hydrogen fluoride and ammonium fluoride using a sealed reaction tank equipped with a supply port for adding the fluoroetchant solution to the tank, a supply port for adding calcium carbonate to the tank, a vapor supply port for adding steam to heat the solution in the tank, an air supply port for providing air to aerate the contents of the tank, a stirrer for stirring the contents of the tank, an ejector for removing vapors from the tank connected to the tank via a mist separator for separating mist from the vapors being removed from the tank, and an exhaust port for removing calcium fluoride from the tank.

Abstract: A method for electrically attenuating a noise in an area for a sound wave to be propagatable in a three dimensional direction by making up a drive signal from the information on the noise and previously given filter coefficients by use of an adaptive digital filter and then generating an additional sound wave in accordance with the drive signal for cancellation of the noise. In the electric noise attenuation method, there are provided in a given region for noise attenuation, first and second error sensor groups for detecting an interference sound wave produced between the noise and additional sound wave, at a sampling time, a filter coefficient is calculated based on the information relating to the first error sensor group, at the next sampling time, another filter coefficient is calculated based on the information relating to the second error sensor group, and these operations are repeatedly executed sequentially for each error sensor to thereby update the filter coefficient of the adaptive digital filter.

Abstract: A system for treating waste water using a particulate body formed by covering and fixing nitrifying bacteria. In the system, the particulate body is inserted in a nitrifying vessel which including therein an air diffusion device for supplying oxygen to the nitrifying bacteria and a particulate body separation device for preventing the outflow of the particulate body. The nitrifying vessel and the particulate body contained therein are used as a nitrifying vessel unit and one or more such nitrifying vessel units are arranged within a treating tank. Waste water is circulated between the nitrifying vessel and the other portions of the treating tank than the nitrifying vessel by means of the air lift effect of the air diffused from the air diffusion device.

Abstract: An electronic noise attenuation system for attenuating a sound wave propagated from a source of noise by generating another sound wave 180.degree. out of phase and having the same sound pressure with the propagated sound wave from electro-mechanic transducer means disposed in a propagation passage of sound waves. In the electronic noise attenuation system, a drive signal for drive the electro-mechanic transducer means is generated in accordance with output signals respectively output from upstream-side and downstream-side mechano-electric transducer means respectively disposed in the propagation passage with the electro-mechanic transducer means therebetween. Namely, the drive signal is created by performing an operation on a difference signal between the output signal of the upstream mechano-electric transducer means and the drive signal according to a given transfer function.

Abstract: A draft chamber is located within a clean room for sequentially immersing and processing carriers such as silicone wafers in a plurality of solution vessels provided in the draft chamber. In the draft chamber, a first air flow moves in a substantially horizontal direction from the front portion of the draft chamber toward the rear portion above the surfaces of solutions contained in chemical solution vessels which generate toxic gasses and a second air flow moves downward from the ceiling of the draft chamber. Thus, the toxic gasses generated from the chemical solution vessels are prevented from leaking into the clean room.

Abstract: Microorganisms such as in activated sludge are immobilized by forming a mixture containing the microorganisms, a monomer or prepolymer and alginic acid or water soluble alignate, and dropping the mixture into a water solution of polyvalent metal ion and a polymerization initiator to form particles containing the microorganisms. Preferably, the monomer is an acrylamide monomer, the prepolymer is an ester of an acrylic acid group and polyethylene glycol and the polymerization initiator is a persultate. By this method, the microorganisms are protected from toxic substances such as the polymerization initiator during immobilization.

Abstract: An electronic noise attenuation system for attenuation of non-steady noise occurring in a propagation passage such a duct line by conducting adaptive controls by use of a computer system including a digital filter therein. Sensing microphones M.sub.1, M.sub.2 are located in the propagation passage with a cancellation sound source S therebetween at positions where the transfer functions Hr, Ht of a sound wave generated from the cancellation sound source are equivalent to each other. The output signal of the sensing microphone M.sub.1 and the phase-inverted version of the output signal of the sensing microphone M.sub.2 are input via an add circuit to the control part of the system. The system can prevent the occurrence of an acoustic feedback from the cancellation sound source to the sensing microphone M.sub.1 so as to realize a stable and highly accurate noise attenuation.

Abstract: The bacterium producing thermostable .alpha.-amylases of this invention is an anaerobic bacterium belonging to Clostridium. The thermostable .alpha.-amylases of this invention is novel .alpha.-amylases which are excellent in thermostability and acid resistance and have a slight calcium requirement. Said .alpha.-amylases are obtained by culturing the aforesaid bacteria and collecting the .alpha.-amylases from the culture. When the aforesaid .alpha.-amylase is used, sugar production process can be greatly rationalized.

Abstract: A clean room wherein clean air obtained through filters from the upper portion of the clean room is blown toward the floor, through the openings in the floor, and with the clean air being discharged again through the filters from the upper portion of the clean room. The air flow rate of clean air in the aisle areas is greater than the air flow rate in the wafer handling areas, and the opening rate of the floor is smaller in the portion near to an air return under the floor than in the portion remote from the air return thereby greatly reducing the diffusion of dust to the wafer handling areas.

Abstract: The present invention relates to a method of and an apparatus for emitting light in ice, to be applied to an ice skating rink and the like. With the apparatus for emitting light in ice according to the present invention, when light emission sources are light emitting diodes (LED), LED mounting blocks are used and laid on a concrete floor, so that mounting works can be facilitated. Additionally, LED are used as the light emission sources, so that a possibility of ice melting can be eliminated. Furthermore, with the apparatus for emitting light in ice according to the present invention, when miniature incandescent bulbs are used as the light emission sources, the miniature incandescent bulbs disposed in transparent vinyl chloride tubes are laid on the concrete floor, so that a special water-proof measure can be dispensed with. Furthermore, air is delivered into the tube, whereby heat in the tube is prevented from being stagnant in the tube, so that the ice melting is avoided.

Abstract: The present invention relates to an air-conditioning and an environmental control device for manufacturing plants of integrated circuits, chemicals and foods, hospitals, etc. where clean air is required. In this environmental control device, controlled air blows out from one side and is absorbed into the other side of the room. The blowing surface and the absorbing surface are divided on the basis of the predetermined module. Ventilating units are formed in a suitable size to conform to the module. Because of the construction, the controlling system of temperature or cleanliness of the air in the environmental control room can be rearranged to an optional one by replacing or changing positions of the ventilating units. Even if a controlling system is rearranged to an optional one, the room should be divided into a supply chamber, a mixing chamber, an environmental control chamber and a return chamber from one side to the opposite side of the room, so that air conditioned can flow as required.

Abstract: The present invention provides a method for decontaminating metal components which have been contaminated on their surfaces with radioactive substances, characterized in that radioactivated oxide films on the metal surfaces are electrolytically removed by an alternating electrolysis method in a neutral salt solution. According to the invention, oxides and hydroxides for metals removed by the electrolytic treatment are separated from the electrolyte and solidified. The method of this invention makes it possible to positively remove the radioactivated oxide films from a base metal.

Abstract: An electrostatic particle precipitator for removing dust particles from a flue gas. The precipitator includes a plurality of collecting electrodes in the shape of plates mounted on endless chains and moving between a first region through which flue gas to be treated flows and a second region where the flow of gas is extremely scarce. A dust removal mechanism is positioned in the second region to remove dust which accumulates on the electrode plates. The moving speed of the collecting electrodes is controlled within a certain range to maintain a prescribed thickness of dust on the electrodes whereby the ocurrence of reverse ionization phenomenon is prevented.

Abstract: Supercooling of sodium thiosulfate pentahydrate is prevented by adding thereto naphtharene or naphthol and/or at least one of calcium sulfate, potassium chloride, sodium chloride, potassium bromide, sodium bromide, potassium iodide, and sodium iodide, or a pyridine.

Abstract: A heat-storing composition comprising acetic acid and at least one of sodium acetate, ammonium acetate, potassium acetate and calcium acetate works at a desired temperature in a temperature range of 5.degree.-20.degree. C. and is chemically stable with a high heat-storing capacity.

Abstract: An apparatus and process for tubular membrane separation, such as reverse osmosis or ultrafiltration, with an arrangement for removing undesirable deposits from the semipermeable membrane surfaces. For the removal of the deposits, elastic elements are passed, together with the feed solution being treated, through the tubular modules lined with semipermeable membranes, separated from the solution, and are recycled with a fresh supply of the solution from a tank, so that the semipermeable membranes are continuously cleaned while separating a part of the solution by permeation therethrough.