摘要:
A method for producing 2-methylspiro(1,3-oxathiolane-5,3')quinuclidine, which comprises reacting 3-hydroxy-3-mercaptomethylquinuclidine or a salt thereof and a carbonyl compound in the presence of a catalyst made of at least one member selected from the group consisting of tin halides, oxyacids of phosphorus, phosphorus oxyhalides and organic sulfonic acids, to produce cis-form 2-methylspiro(1,3-oxathiolane-5,3')quinuclidine or a salt thereof.
摘要:
A ribbon cassette of which the type of ink ribbon accommodated in the ribbon cassette may be identified by diagonally-arranged detection switches arranged on the carriage of a thermal transfer printer, without using a plurality of types of ribbon cassette case which are different in shape.
摘要:
A novel process for producing highly crystalline, fine .alpha.-alumina is disclosed. Aluminum hydroxide is calcined in the presence of fine silica powder. The obtained alumina is in the alpha form and has a specific surface area of least 10 m.sup.2 /g.
摘要:
A dynamic addressing display device includes a display panel and generates a number of dot data signals and data clock signals equal to the number of picture elements per row required to display one character on the display panel. It is therefore not necessary to generate extra dot data signals or data clock signals representing additional data driver bits greater than the number of picture elements per row required to display one character on the display panel. A data driver is coupled to the display panel for driving a plurality of data electrodes of the display panel. The number of data clock signals is counted by a data clock counter. When the number of clock signals counted equals the number of picture elements per row required to display one character on the display panel the data clock signals are modulated by a data clock adder to shift the clock signals an amount of bits equal to the additional number of outputs of the data driver. The resultant clock signals are sent to a shift register. Then, the data stored in the shift register is shifted in sequence with the modulated clock signals to drive the data electrodes. Thus all the data signals generated to display one character on a display panel are used.
摘要:
4,4'-Dihydroxybiphenyl is prepared by decomposing 4,4'-di(2-hydroxy-2-propyl)biphenyl with hydrogen peroxide and an acid catalyst in acetonitrile as a solvent. Especially, this process minimizes the formation of by-products and permits easy purification of the intended product.
摘要:
A thermal printer which always performs a satisfactory printing operation regardless of whether a ribbon cassette mounted for printing houses an ink ribbon for hot release mode printing or an ink ribbon for cold release mode printing. Hot release mode printing is satisfactory for printing normal printing papers, while cold release mode printing is satisfactory for printing OHP (overhead projection) papers. The printer is capable of sensing the difference between ribbon cassette having an ink ribbon for hot release mode printing and a ribbon cassette having an ink ribbon for cold release mode printing, when mounted on the printer for printing. The printer upon sensing the type of ribbon cassette mounted, then adjusts its components, if necessary, so that they are configured in locations appropriate to perform satisfactory printing according to the type of ink ribbon housed in the ribbon cassette mounted. Alternatives include moving a carriage on which the ribbon cassette is mounted toward and away from a platen against which the paper to be printed is placed, moving the location of the ribbon cassette toward or away from the platen against which the paper to be printed is placed, and moving an arm which may guide the ink ribbon after it passes the thermal head.
摘要:
There is provided a sheet feed control method for feeding sheets at a predetermined pitch to the printing section of a printing machine that comprises a sheet feeding roller and a pair of small rollers provided one upstream and the other down stream and pressed against the outer periphery of said sheet feeding roller to sequentially catch and convey sheets, said sheet feed roller being rotated by means of a transmission gear mechanism driven by a source of driving force, said control method being characterized by that it is so designed as to be capable of calculating the time when the rear edge of a sheet passes between said sheet feed roller and said upstream small roller and offsetting or compensating for the preceding backlash of said transmission gear mechanism by modifying said pitch when the rear edge of said sheet passes between said sheet feed roller and said upstream small roller by an amount that corresponds to the amount of the backlash. A sheet feed control method according to the present invention can be effectively used for preventing any unintended blanks and overlaps of printing from occurring and ensuring an excellent quality of printing.
摘要:
Biphenyl-4,4'-dicarboxylic acid is prepared by isolating a mixture of diisopropylbiphenyls from a reaction mixture obtained by reacting biphenyl with propylene, crystallizing 4,4'-diisopropylbiphenyl from the mixture of diisopropylbiphenyls, and oxidizing 4,4'-diisopropylbiphenyl or an oxidation intermediate thereof with molecular oxygen in the presence of an oxidation catalyst, which comprises a cobalt catalyst and/or manganese catalyst, in a solvent containing at least 50 wt. % of an aliphatic mono- carboxylic acid having up to 3 carbon atoms.
摘要:
A color image recording apparatus wherein a color photosensitive material is exposed by light responsive to a color still image signal. The apparatus comprising a device for obtaining picture element data by sampling color signals of three primary colors of the still image, a device for .gamma.-correcting the picture element data to be recorded, an FOT for exposing the color photosensitive material by three primary colors responsive to the picture element data from the device for .gamma.-correction, a horizontal deflecting device for horizontally sweeping the electron beam of the FOT; and vertical deflecting device for vertically sweeping the electron beam.
摘要:
A path trace Viterbi decoder comprising an ACS circuit for generating a path selecting signal, a path memory for storing the path selecting signal, a node calculator for calculating the node number of a most likely path on the basis of the data read out from the path memory, and a trace memory for storing the most likely path data, etc. The node number data of the most likely path calculated by the node calculator is stored in the trace memory and the decoding operation is carried out by using the data read from the trace memory.