Abstract: A bit field logic operation unit which performs a logic operation accompanied by a masking operation comprises a logic operation part, a mask pattern generation part, and a bit map operation part. All parts are constituted by dynamic circuit constructions where the processes are performed in a preset period and an active period. The preset periods of the logic operation part and the mask pattern generation part are carried out simultaneously, and the active periods of the logic operation part and the mask pattern generation part and the preset period of the bit map operation part are carried out simultaneously.

Abstract: From a maltose solution of a purity of 75 to 90%, a high-purity maltose solution having a maltose purity of more than 98.5% is obtained in a high yield by preparatorily treating activated carbon with the aqueous solution of an organic solvent, adding the same organic solvent to the maltose solution under treatment until the concentration of the organic solvent equals that in the aqueous solution used for the treatment of the activated carbon, and subsequently bringing the resultant solution into contact with the activated carbon for thereby allowing the activated carbon to adsorb selectively out of the solution only the saccharides such as maltotriose and maltotetraose which are composed of three or more glucoses.