Abstract: This invention relates to a process for producing aromatic divalent carboxylic acid ester and diatomic alcohol by reacting aromatic polyester and super critical monatomic alcohol, and by the process, PET is decomposed for recovering monomer components therefrom, and thus recovered monomer components can be used as the material for reproduction of new PET. In accordance with the present invention, there is provided a process for producing continuously monomer components from aromatic polyester, the process including the steps of: feeding continuously the above aromatic polyester and the above monatomic alcohol into a reactor while the above reactor is kept to be under the super critical condition of the above monatomic alcohol; reacting the above aromatic polyester and the above super critical monatomic alcohol and discharging the resultant reaction products, i.e.

Abstract: A method for producing carbon fiber comprising applying an infusibilization to a pitch fiber yarn made using mesophase pitch as a starting material in a state with substantially no tension applied to the yarn and in an oxidizing gas atmosphere including nitrogen dioxide and oxygen, then sintering in an inert gas atmosphere of 350.degree. C. to less than 400.degree. C. for 10 minutes or more for primary carbonization, then applying secondary carbonization at a temperature of 800.degree. to 1300.degree. C. for 5 to 120 seconds, while feeding out the yarn in the linear form and continuously transporting the same.

Abstract: A bundle of pitch-based carbon fibers which is composed of 1000 to 100,000 continuous fiber filaments having an average diameter of 4 to 8 .mu.m, a filament tensile strength of at least 3.0 GPa, and a modulus of at least 600 GPa, and also a method for producing a fine diameter pitch-based carbon fiber wherein use is made of a spinning nozzle with a single nozzle plate which has at least 1000 capillary holes, has the capillaries arranged concentrically and circularly in 3 to 20 rows, has the capillaries positioned to be divided into at least two blocks, has a columnar projection protruding at least 20 mm from the surface of the nozzle plate at the center of the nozzle plate, and has capillaries of a diameter of 50 to 110 .mu.m.

Abstract: In a numerical control system which controls the rotational angle of a spindle in a numerically controlled machine and tool in synchronism with the position of a feed axis based on a data table storing information for positional commands for the feed axis in correspondence with the rotational angle of the spindle, a universal purpose turning operation is effected at a higher efficiency by generating a marker pulse when a value set by counting the pulses in A- and B-phases from a spindle pulse generator has reached a pre-set value, and by controlling synchronization during synchronized operation, based on the marker pulse instead of the marker phase pulse from the spindle pulse generator.

Abstract: A numerical control apparatus is provided for controlling a position of a feed shaft in relation to a rotational angle of a main shaft of a machine tool. A value denoting the actual position of the feed shaft is subtracted from a positional command value to obtain a positional deviation value. The positional command value is one of a plurality of prestored values corresponding to a given rotational position of the main shaft. The positional deviation values for a single rotation of the main shaft are stored in a data table and displayed on a display device. Another data table having a plurality of correction values stored therein is provided. Each of the plurality of correction values stored in the correction value data table corresponds to a given rotational position of the main shaft. For each rotational position of the main shaft, the positional deviation value and a corresponding correction value are added together to obtain a corrected deviation value.

Abstract: A method of preparing an carbonaceous pitch, including the steps of:subjecting a raw material oil to thermal cracking conditions while removing cracked, light hydrocarbon components to obtain a pitch product containing at least 5 weight % of mesophase and not more than 10 weight % of light hydrocarbon components with a boiling point at 60 mmHg of 300.degree. C. or less and having a softening point of between 160.degree. and 220.degree. C., the raw material oil being composed mainly of a residual oil which has a boiling point of 350.degree. C. or more and which is derived from a naphthene base petroleum crude; andremoving the mesophase from the pitch product to obtain a substantially mesophase-free carbonaceous pitch.

Abstract: A process for the preparation of carbon fibers, including the steps of:subjecting a raw material oil to thermal cracking conditions at a temperature of between 400.degree. to 500.degree. C. while removing cracked, light hydrocarbon components to obtain a pitch product containing at least 5 weight % of mesophase and not more than 10 weight % of light hydrocarbon components with a boiling point at 60 mmHg (absolute) of 300.degree. C. or less and having a softening point of between 140.degree. and 220.degree. C., the raw material oil having a boiling point of at least 500.degree. C. and containing at least 30 weight % of a residual oil which has a boiling point of at least 500.degree. C. and a metal content of at least 200 weight ppm and which is derived from a napthene base and/or intermediate base petroleum crude;removing the mesophase having a particle size of more than 10 .mu.

Abstract: A vehicle navigator is disclosed, in which in response to a storage command signal generated by the turning on of a storage switch, the present position data of a vehicle corresponding to the present cursor position is stored in a memory. In response to a set command signal subsequently generated by the turning on of a set switch, the running track data between the latest position stored and the present cursor position is stored in the memory, so that the running track is additionally displayed on a road map display device.

Abstract: In a vehicle-mounted navigator, a control unit reads map data from a memory unit and displays a corresponding road map on a CRT display unit. In response to signals from a distance sensor and a direction sensor, the present position in relation to the running of the automotive vehicle is computed to display by superimposition the present position on the road map display of the display unit. When the computed present position has reached to a predetermined portion of an adjacent area, the map data of the road map adjacent to the road map on display is read from the memory unit and a corresponding road map is displayed on the display unit manually or automatically. In accordance with this updated display, the present position display is moved to a corresponding position on the updated road map display.

Abstract: In a navigator for use on a road vahicle, a memory is responsive to an external switch operation to preliminarily store any specific point on a map and a controller is responsive to the generation of a move command to move a cursor indicative of the present position of the vehicle to the specific point stored in the memory. In this way, by preliminarily entering any specific point into the memory, it is possible to easily set the position of the vehicle to the stored specific point.

Abstract: An automotive navigator using a microcomputer displays a car position by a cursor on a road map displayed on a CRT screen. The navigator uses a cassette tape which stores a plurality of road map data and several kinds of reduced map data and expanded map data. It also uses a group of manual switches including a switch for changing the displayed area, a switch for selecting an expanded map or reduced map and a switch for moving the cursor position. Necessary data are displayed on the screen by the state of each switch. A region corresponding to the cursor position is displayed by the expanded map.

Abstract: In a navigation system arranged to display a road map in accordance with road map information from a cassette tape, and the present location of a motor vehicle equipped with the navigation system, a cassette tape distinguishing circuit is provided to a cassette tape player which picks up the road map information from a predetermined cassette having a window at given portion of the cassette housing. A switching circuit is responsive to the cassette tape distinguishing circuit so that the output data of the cassette tape is processed to display a given map only when a cassette carrying road map information is loaded in the cassette tape player. In the case a normal cassette carrying audio signals, such as music, is loaded the picked up audio signal is transmitted to an amplifier so that sound reproduction is effected. Thus, a single cassette player can be used in common as both a part of the navigation system and a part of a sound reproduction system.