Abstract: A solid-liquid boundary detection device 20 is a device for detecting a boundary 141 between a solid and a liquid in a test tube 14, and includes a surface illumination 21, an imaging unit 22, and a boundary detection processor 31. The surface illumination 21 illuminates the test tube 14 from outside. The imaging unit 22 is arranged on an opposite side of the test tube 14 from the surface illumination 21, and captures an image including the boundary 141. The boundary detection processor 31 detects the boundary 141 from the image captured by the imaging unit 22.

Abstract: A desk-top centrifuge is provided which includes a switching element disposed between a dc power supply and a motor and a controlling circuit. The controlling circuit receives a voltage of power regenerated by the motor to provide a pulse width-controlled on-off signal to the drive switching element to control speed of the motor. The controlling circuit increases an on-duration in which the on-off signal is at an on-level at a given rate to turns the motor slowly. The centrifuge has a safety guard system made up of a door switch and a door lock switch which are installed in series between the dc power supply and the motor and work to establish electric communication between the dc power supply and the motor when the door is closed and locked.

Abstract: A desk-top centrifuge is provided which includes a switching element disposed between a dc power supply and a motor and a controlling circuit. The controlling circuit receives a voltage of power regenerated by the motor to provide a pulse width-controlled on-off signal to the drive switching element to control speed of the motor. The controlling circuit increases an on-duration in which the on-off signal is at an on-level at a given rate to turns the motor slowly. The centrifuge has a safety guard system made up of a door switch and a door lock switch which are installed in series between the dc power supply and the motor and work to establish electric communication between the dc power supply and the motor when the door is closed and locked.

Abstract: A centrifugal separator comprising: a rotor for containing a sample; a rotating unit; a detection circuit for detecting a distance between a reference position and a position of the rotor and generating a distance detection signal; a rectifying circuit for half-wave rectifying the distance detection signal; a judging circuit for judging the distance detection signal from the rectifying circuit; and a controller for controlling the rotating unit in accordance with a judging result of the judging circuit and a corresponding method are disclosed. The judging circuit judges whether the distance is in a balanced condition of or an unbalance condition of the rotor.

Abstract: A centrifugal protection apparatus including: a rotor having markers connected to a motor responsive to drive signals; first and second detectors for detecting the marker upon rotation of the rotor and generating first and second detection signals respectively; a drive circuit responsive to a command for generating the drive signals from the supply power via input terminal in response to the first or second detection signal; first and second switch circuits, arranged in series between the input terminal and the motor, for controlling the supply of the drive signals to the motor; a current detector for detecting a current of one of the drive signals and generating a current detection signal; and first and second judging portions for detecting whether the first and second detection signals are within a predetermined value and for operating the first and second switch circuits to cut off the drive signals when the first and second detection signals are not within the predetermined value respectively and when a m

Abstract: There is disclosed an oxygen gas permselective membrane comprising a film of a water-containable or wettable metallic oxide.The oxygen gas permselective membrane according to this invention, though being very thin, does not allow water vapor and carbon dioxide gas in air to permeate therethrough and has a great function for allowing oxygen gas to selectively permeate therethrough.

Abstract: An air electrode to be used for carrying out electrochemical reduction of an oxygen gas, which comprises an electrode body composed of a porous body and a fluorine-containing solvent incorporated therein. The air electrode is suitable for use in a hydrogen/oxygen fuel cell, a metal/air cell or an oxygen sensor.

Abstract: There is presented a chemical copper-plating bath capable of providing a plated film having excellent mechanical characteristics, especially ductility, which bath contains a specific additive having the following formula: ##STR1## Stability of the bath as well as further improvement of mechanical strength of plated films are also found to be attained by adding in combination at least one compound selected from the group consisting of 1,10-phenanthroline, its derivatives, 2,2'-dipyridyl, 2,2'-diquinoline and water-soluble cyanides.

Abstract: An electrochemical cell which includes a sealed metallic container at least partially composed of an anode metal member and a cathode metal member, said container containing a power generating material. At each edge portion of the metal members is covered by a seal material including a coating layer of thermoplastic resin containing a functional group with hydrogen bonding capability. Sealing of the metallic container is achieved by heat-pressure bonding the seal members formed on the respective metal members with each other or these seal members with similar seal members formed on another metal member forming the metallic container.

Abstract: An improved rechargeable nickel-zinc battery is described which is capable of undergoing many charge-discharge cycles (cycle life), with deep discharge, and of high performance with heavy drain discharge during use. The increased cycle life is accomplished by a suitable combination of electrochemical generating elements. The high performance with heavy drain discharge service is obtained by an improved zinc electrode construction. The battery of this invention has a sheet-like kneaded zinc electrode, a sheet-like nickel oxide electrode with limited capacity ratio thereof, a separator, an electrolyte absorber, and a concentrated alkaline electrolyte in limited amounts.

Abstract: The positive electrode of a nickel-zinc cell comprises a positive electrode composition containing less than 90 parts by weight manganese dioxide in 100 parts of nickel oxide which is mixed with an electroconducting material and binding material. The positive electrode composition, preferably is tightly covered with an electron conducting sheet containing many apertures. The nickel-zinc cells modified by these procedures have an improved capacity which is available during heavy current discharge loads, particularly under intermittent discharge, and the capacity loss of the cells during storage is reduced.

Abstract: Provided is a nickel-zinc storage battery prepared, preferably, by winding into a whirlpool a sheet-like zinc electrode, a sheet-like nickel electrode and a separator with the separator interposed between the zinc and nickel electrodes, said zinc electrode being obtained by bonding under pressure to a collector a mixture sheet consisting of zinc oxide, zinc, bismuth oxide, calcium hydroxide and fluoroplastic, said nickel electrode being obtained by bonding under pressure an oxide of nickel to a collector together with a conductive material, said separator being obtained by coating on an alkali-resisting nonwoven fabric a mixture of polyvinyl alcohol and at least either of one selected from the group consisting of boric acids and metal oxides having low solubility to alkali solution and drying the nonwoven fabric thus coated.