Abstract: A fixing-unit roller includes: a core bar; and an elastic layer formed on an outer peripheral surface of the core bar. The elastic layer is formed from a porous material that contains a plurality of cells. Cells in a cross section obtained by cutting across the porous material are 0.1 ?m or greater and 50 ?m or less in size. A ratio of an area occupied by composite cells, which are made of partially-overlapping spherical cells, in a 200-?m square in the cross section to an area of the square is 60% or greater and 70% or less.

Abstract: A fixing-unit roller includes: a core bar; and an elastic layer formed on an outer peripheral surface of the core bar. The elastic layer is formed from a porous material that contains a plurality of cells. Cells in a cross section obtained by cutting across the porous material are 0.1 ?m or greater and 50 ?m or less in size. A ratio of an area occupied by composite cells, which are made of partially-overlapping spherical cells, in a 200-?m square in the cross section to an area of the square is 60% or greater and 70% or less.

Abstract: A file sharing method and system for a multiprocessor system has an auxiliary storage unit that is shared in use by a plurality of processors each adopting virtual storage management. An auxiliary page table for storing on a page-by-page basis addresses of files contained in the auxiliary storage unit is prepared on a main storage provided for each of the processors. In response to a file map request issued by a program, an address of the file stored in said auxiliary storage unit is stored in the auxiliary page file. When the file is not stored in the main storage, a page exception interruption occurs, in response to which the address of the file stored in the auxiliary page table is referenced to for thereby transferring the file to the main storage from the auxiliary storage unit. The file stored in the auxiliary storage unit is transferred in the state undergoing an exclusion control.