Abstract: A method for producing a barium titanate-based powder, the method including: step a of spraying a raw material including a barium titanate-based compound into a high-temperature field heated to a temperature equal to or higher than a melting point of the compound to form barium titanate-based particles; and step b of heating a powder including the barium titanate-based particles formed in step a at 700 to 1300° C.

Abstract: A method for producing a barium titanate-based powder, the method including: step a of spraying a raw material including a barium titanate-based compound into a high-temperature field heated to a temperature equal to or higher than a melting point of the compound to form barium titanate-based particles; step b of calcining a powder including the barium titanate-based particles formed in step a; and step c of washing a calcination product obtained in step b with a water-based washing liquid.

Abstract: A forming apparatus forming part of or the entire circumference of a cylindrical work piece into a circular or deformed circular shape, such as an ellipse, etc. A spindle mechanism has a processing tool R mounted at the tip of the spindle, and a holding mechanism holds the cylindrical work piece W disposed in a way to face the spindle mechanism. An axial shifting means for shifts the spindle mechanism and the holding mechanism relatively in the axial direction of the spindle. A shifting motion means enabling the holding mechanism to make prescribed shifting motion, and a control mechanism drives the axial shifting means and shifting motion means in linkage with each other.

Abstract: The present invention, the objective of which is to provide a forming apparatus for forming part of or the entire circumference of a cylindrical work piece into circular or deformed circular shape, such as ellipse, etc., comprises a spindle mechanism having a processing tool R mounted at the tip of the spindle, and a holding mechanism for holding the cylindrical work piece W disposed in a way to face the spindle mechanism, and is provided with an axial shifting means for shifting the spindle mechanism and the holding mechanism relatively in the axial direction of the spindle, a shifting motion means for enabling the holding mechanism to make prescribed shifting motion, and a control mechanism for driving the axial shifting means and shifting motion means in linkage with each other.

Abstract: A novel process is provided for producing a 5-perfluoroalkyl-5,6-dihydrouracil represented by General Formula (1): ##STR1## (where R.sup.1 and R.sup.2 are independently hydrogen, methyl, or ethyl, and Rf is a perfluoroalkyl of 1 to 10 carbons). The process comprises reacting .alpha.-perfluoroalkylacrylic acid represented by General Formula (2):CH.sub.2 =C(Rf)--COOH (2)with a urea derivative represented by General Formula (3):R.sup.1 NHCONHR.sup.2 (3)in the presence of acetic anhydride with formed acetic acid being removed out of the reaction system during the reaction. The .alpha.-perfluoroalkylacrylic acid may be added successively. A process for producing a 5-perfluoroalkyl-5-bromo-6-hydrouracil by General Formula (4) is also provided: ##STR2## (where R.sup.1, R.sup.2, and Rf are as defined above) wherein the reaction of a 5-perfluoroalkyl-5,6-dihydrouracil produced by the above process with bromine is conducted in water as the solvent.