Abstract: An information processing apparatus according to an embodiment includes a processing circuit. The processing circuit acquires a measurement field corresponding to a spatial distribution of a predetermined physical quantity in a subject of measurement. The processing circuit calculates an unknown quantity in the subject of measurement based on a first equation between the measurement field and the unknown quantity having spatial dependence, and on the acquired measurement field. The first equation is one that is acquired based on a second equation expressing a dual field divergence of which can be expressed using the measurement field, by using the measurement field and the unknown quantity, and on the Helmholtz decomposition of the dual field.

Abstract: An information processing apparatus according to an embodiment includes a processing circuit. The processing circuit acquires a measurement field corresponding to a spatial distribution of a predetermined physical quantity in a subject of measurement. The processing circuit calculates an unknown quantity in the subject of measurement based on a first equation between the measurement field and the unknown quantity having spatial dependence, and on the acquired measurement field. The first equation is one that is acquired based on a second equation expressing a dual field divergence of which can be expressed using the measurement field, by using the measurement field and the unknown quantity, and on the Helmholtz decomposition of the dual field.

Abstract: A hard disk cartridge, comprising an outer box and a hard disk body supported in the outer box through a cushion member, wherein a hard frame is installed on at least right and left side faces of the hard dish body and the cushion member is installed on the outer surfaces of the frames so that the upper and lower ends thereof are extruded from the upper and lower surfaces of the hard disk body to the outside, whereby external impacts applied to the hard disk body in lateral and vertical directions can be absorbed by the cushion member and, since the impact force can be relieved sufficiently even if the cushion member is thin, the size of the hard disk cartridge can be reduced accordingly.