Abstract: A tidal power generation apparatus includes a first group of containers fixed in plural piles in a natural sea having a tidal difference in sea level height, which containers are spaced in parallel to one another at fixed intervals, each container of which is opened at a lower side thereof and is capable of holding air therein, a second group of containers fixed in plural piles in tideless water within an artificial dam, which second group of containers are spaced parallel to one another at fixed intervals, each container of which is opened at a lower side thereof and is capable of holding air therein, and air pipes providing communication between respective containers of the first group in the natural sea and respective containers of the second group within the artificial dam. With the apparatus, the energy in a tide is collected in the form of energy in compressed air created by water pressure at high tide.

Abstract: An apparatus for the continuous perfusion of a liquid in cell culture, hydroponic and breeding processes includes a container having a sealed lower portion and an open upper portion, a hollow tube having an upper end in the open upper portion and a lower end in the sealed lower portion of the container for introducing liquid to be perfused into the sealed lower portion, a blast pipe for introducing perfusing gas into the sealed lower portion of the container, and a hollow U-shaped pipe extending from above the sealed lower portion of the container and thereinto. The relative positioning of the ends of the hollow tube and hollow pipe at a particular height differential provides for a piston like movement of air and liquid to perfuse the liquid without requiring any electricity or motors.

Abstract: A multi-gas-phase settling tank has a plurality of containers mounted upside down in vertical spaced relation at fixed intervals for holding a predetermined quantity of gas under water. Each container has a flat horizontal wall, side walls extending downwardly therefrom, a vent port in the flat horizontal wall and a hollow projection extending downwardly from the vent port for a shorter distance than the height of the side walls. The containers can be mounted at their corners in relation to each other or on inner walls of a settling tank.

Abstract: A multiple-gas-phase liquid treatment apparatus for use, for example, as a gas dissolving apparatus, gas removing apparatus, sewage treatment apparatus, or large-quantity culture apparatus includes a hollow container, a plurality of horizontal partition plates mounted in the hollow container to define a plurality of vertically-stacked liquid treatment chambers, a pouring port for introducing liquid to be treated into an upper portion of the hollow container, a discharge port for removing treated liquid from a bottom portion of the hollow container, a gas vent port for introducing gas into the bottom portion of the hollow container, and a hollow tube connected to each horizontal partition plate and extending a predetermined distance downwardly therefrom. Liquid introduced into the top portion of the hollow container flows from one partition plate to an adjacent lower partition plate through the hollow tube in each partition plate.

Abstract: The present invention comprises tray-like shallow vats placed upside down and horizontally at intervals in a culture tank so as to provide partitioned air spaces in mid water. When gas is sent, via an air supply pipe, into an air space provided at the bottom vat, a good number of artificial environments, in contact with an atmospheric environment in a manner similar to the natural surface of the water, are efficiently provided in the culture tank.