Abstract: An R-T-B permanent magnet that contains: main-phase grains composed of an R2T14B compound (where R is a rare earth element, T is a transition metal element, and B is boron); and grain boundaries. R includes Ce. The grain boundaries include multi-grain grain boundaries that are adjacent to three or more main-phase grains. The multi-grain grain boundaries include an R-rich phase, and lamellar or acicular R-T precipitates are present in the R-rich phase.

Abstract: A pipe member is provided that is capable of configuring a heat pipe that can be installed with a high flexibility in accordance with the state of the installation place. A heat pipe configured by using such a pipe member, and a cooling device are also provided. The pipe member includes: an arbitrarily bendable pipe main body whose both ends are closed when used for the heat pipe; a partition wall extended in an axial direction of the pipe main body to partition the inside of the pipe main body into four passages each being utilized as a flow path of the working fluid; and connection paths which allow neighboring passages to communicate with each other out of the four passages.

Abstract: A pipe member is provided that is capable of configuring a heat pipe that can be installed with a high flexibility in accordance with the state of the installation place. A heat pipe configured by using such a pipe member, and a cooling device are also provided. The pipe member includes: an arbitrarily bendable pipe main body whose both ends are closed when used for the heat pipe; a partition wall extended in an axial direction of the pipe main body to partition the inside of the pipe main body into four passages each being utilized as a flow path of the working fluid; and connection paths which allow neighboring passages to communicate with each other out of the four passages.

Abstract: The objective of the present invention is to provide: a cushion cell with a new structure which is designed to disperse stresses when the cushion cell is in an inflated state such that excellent durability is achieved and in which a large support area for the human body can be obtained with excellent space efficiency relative to a square shaped space for disposal in an inflated state; and a cushion body with a new structure using the same. The cushion cell is formed with a fluid chamber inside and the height of the cushion cell can be changed by adjusting the pressure in the fluid chamber. The planar shape of the cushion cell in a deflated state is a square shape, and each side part has a curved shape protruding outwards.

Abstract: The objective of the present invention is to provide: a cushion cell with a new structure which is designed to disperse stresses when the cushion cell is in an inflated state such that excellent durability is achieved and in which a large support area for the human body can be obtained with excellent space efficiency relative to a square shaped space for disposal in an inflated state; and a cushion body with a new structure using the same. The cushion cell is formed with a fluid chamber inside and the height of the cushion cell can be changed by adjusting the pressure in the fluid chamber. The planer shape of the cushion cell in a deflated state is a square shape, and each side part has a curved shape protruding outwards.