Abstract: An information playback apparatus which can perform scan playback capable of being performed with finer settings. When a unit cycle B and a playback time A within the unit cycle B are specified and the start of the scan playback of playback data recorded in a DVD is specified, playback control data having address information and information of the playback order appended to each piece of data in the smallest basic units of the playback data is read out from the DVD, whereby the scan playback of the playback data is performed by managing the playback time A in every unit cycle B. Also, when access-inhibited data is present within the playback data, the scan playback of playback data is performed except the access-inhibited data.

Abstract: A disc reproducing apparatus is provided which is adapted to scan information tracks to read information recorded on an information recording medium. This disc reproducing apparatus comprises: determining means capable of determining an actually happened track jump, said determining being effected when a difference between a present reproducing positional information and a reference reproducing positional information is larger than a predetermined value; detecting means for detecting a present track position which is just being reproduced at a present time; and setting means for setting said predetermined value corresponding to the present track position, in accordance with a result of the detecting means.

Abstract: A system for reproducing recording mediums has a reproducing device, a storing device for storing a plurality of recording mediums, a moving device for relatively moving the reproducing device and storing device for reproducing a recording medium. A controller is provided to be responsive to a command for operating the moving device for positioning the reproducing device and the storing device at predetermined fixable initializing positions.

Abstract: A plug for use in a cylinder of an internal combustion engine adapted to limit the production of nitrogen oxide (NOx). The plug has an inner cover which surrounds the ignition electrodes with the inner cover having an opening to provide communication between the electrodes and the engine cylinder. An outer cover surrounds the inner cover in spaced relation therewith and has an opening in juxtaposition with the inner cover opening. The outer cover has a number of perforations so that water injected between the inner and outer covers through one or more nozzles is evaporated into steam upon engagement with the red-hot outer cover with the steam passing through the perforations into the cylinder in a direction away from the electrodes so as not to interfere with the functioning of the electrodes.

Abstract: Method and device for restraining nitrogen oxide production in combustion gas of internal combustion engines, comprising feeding a suitable quantity of steam into cylinder of internal combustion engine and mixing the steam in fuel-air mixture.