Abstract: A fuel cell stack includes multiple stacked single cells. Each single cell includes a power generating unit, a frame member, a first separator, and a second separator. A gasket is provided between the first separator of a first single cell and the second separator of a second single cell. The first separator of the first single cell includes a first projection, and the second separator of the second single cell includes a second projection. The first projection and the second projection project so as to be in contact with each other, thereby suppressing flow of a cooling medium to the outside of the cooling passage. Aback face of at least one of the first projection and the second projection includes a flat surface section that is in contact with the frame member facing the back face.

Abstract: A single cell for a fuel cell includes a power generating unit and two separators. Each separator includes a surface that faces the power generating unit, and includes gas passages. Each gas passage includes first extensions and a second extension. The second extension connects a downstream end of one of two adjacent first extensions and an upstream end of the other first extension to each other. A first rib is provided between adjacent ones of the first extensions. A second rib is provided on each first rib. The second rib of one of the two separators and the second rib of the other separator extend so as to intersect with each other when viewed in the direction in which the separators sandwich the power generating unit.

Abstract: A fuel cell stack includes stacked single cells. Each single cell includes a power generating unit, a frame including an accommodating hole, and two separators. Each separator has a surface facing the power generating unit. The surface has a gas passage. The gas passage includes first extensions and a second extension. A partition rib is provided between two of the first extensions connected to each other by the second extension. The partition rib includes a base that is in contact with a corresponding one of the gas diffusion layers of the power generating unit, and a protrusion that protrudes from the base into the corresponding gas diffusion layer. The protrusion has an opposing end opposed to an inner surface of the accommodating hole. A pressure loss increasing portion is provided at a boundary between the opposing end and the inner surface of the accommodating hole.

Abstract: A fuel cell stack includes stacked single cells. The single cells each include a power generation portion and a pair of a first separator and a second separator. The first separator includes first passages. The first passages each include first reversal portions and first general portions. The second separator includes second passages. The second passages each include second reversal portions and second general portions. The first reversal portions of the first passages each extend to increase a flow resistance of a cooling medium flowing through a part of a cooling medium flow region that corresponds to the first reversal portion. The second reversal portions of the second passages each extend to increase the flow resistance of the cooling medium flowing through a part of the cooling medium flow region that corresponds to the second reversal portion.

Abstract: A polypropylene for an electric material has a melt flow rate of 0.1 to 30 g/10 min., a mesopentad fraction calculated from a 13C-NMR spectrum of 0.90 to 0.99, and a firing residue of 50 ppm by weight or less based on the polypropylene, a titanium content and an iron content which are detected from the firing residue, of 1 ppm by weight or less and 0.1 ppm or less, respectively, based on the polypropylene, and the chlorine content of 5 ppm by weight or less based on the polypropylene. The above polypropylene exhibits excellent electric insulation and has a roughened surface when it is formed into a film, and thus the polypropylene can be suitably used for a capacitor film without using an additive such as a ? crystal nucleating agent. The polypropylene is also useful as a material of a film for coating an electric wire and a material for an instrument for conveying an electronic material.

Abstract: The present invention relates to a propylene random copolymer which satisfies the following requirements [1] to [4], and to various useful molded products obtained by molding the propylene random copolymer: [1] the concentration (Pa, % by mole) of a skeletal constituent derived from propylene (a), and the concentration (Px, % by mole) of a skeletal constituent derived from at least one olefin selected from ethylene (b) and ?-olefins having 4 to 20 carbon atoms (c), each of which is contained in the propylene random copolymer, satisfy the following relational expressions (Eq-1) to (Eq-3): 85?Pa<100??(Eq-1) 0<Px?15??(Eq-2) Pa+Px=100;??(Eq-3) [2] the concentration (Pa, % by mole) of the skeletal constituent derived from propylene (a) contained in the propylene random copolymer, and the melting point (Tm) measured with a differential scanning calorimeter satisfy the following relational expression (Eq-4): 135?4×(100?Pa)<Tm<165?4×(100?Pa);??(Eq-4) [3] the total amount of 2,1-bonded and 1,3-bon

Abstract: A polypropylene for an electric material has a melt flow rate of 0.1 to 30 g/10 min., a mesopentad fraction calculated from a 13C-NMR spectrum of 0.90 to 0.99, and a firing residue of 50 ppm by weight or less based on the polypropylene, a titanium content and an iron content which are detected from the firing residue, of 1 ppm by weight or less and 0.1 ppm or less, respectively, based on the polypropylene, and the chlorine content of 5 ppm by weight or less based on the polypropylene. The above polypropylene exhibits excellent electric insulation and has a roughened surface when it is formed into a film, and thus the polypropylene can be suitably used for a capacitor film without using an additive such as a ? crystal nucleating agent. The polypropylene is also useful as a material of a film for coating an electric wire and a material for an instrument for conveying an electronic material.

Abstract: The present invention relates to a propylene random copolymer which satisfies the following requirements [1] to [4], and to various useful molded products obtained by molding the propylene random copolymer: [1] the concentration (Pa, % by mole) of a skeletal constituent derived from propylene (a), and the concentration (Px, % by mole) of a skeletal constituent derived from at least one olefin selected from ethylene (b) and ?-olefins having 4 to 20 carbon atoms (c), each of which is contained in the propylene random copolymer, satisfy the following relational expressions (Eq-1) to (Eq-3): 85?Pa<100 ??(Eq-1) 0<Px?15 ??(Eq-2) Pa+Px=100 ??(Eq-3); [2] the concentration (Pa, % by mole) of the skeletal constituent derived from propylene (a) contained in the propylene random copolymer, and the melting point (Tm) measured with a differential scanning calorimeter satisfy the following relational expression (Eq-4): 135?4×(100?Pa)<Tm<165?4×(100?Pa) ??(Eq-4); [3] the total amount of 2,1-bonded and 1,3-

Abstract: A vehicle expression operation control system and vehicle communication system for performing an expression operation to generate an easily understood expression and a vehicle for performing an expression operation. Condition and other information about a vehicle is detected by an operation information collecting section (12) and detected data collection section (14), and supplied to a reaction formulating section (26). Based on current status information of the vehicle held in a state recognizing section (24), the reaction formulating section (26) formulates a reaction and controls performance of an expression operation corresponding to the formulated reaction. Further, based on the reaction formulated, an operation control section (28) controls operation of respective devices equipped to the vehicle, including lights, antennae, and the like, so that the vehicle performs such expression operation.

Abstract: A vehicle expression operation control system and vehicle communication system for performing an expression operation to generate an easily understood expression and a vehicle for performing an expression operation. Condition and other information about a vehicle is detected by an operation information collecting section (12) and detected data collection section (14), and supplied to a reaction formulating section (26). Based on current status information of the vehicle held in a state recognizing section (24), the reaction formulating section (26) formulates a reaction and controls performance of an expression operation corresponding to the formulated reaction. Further, based on the reaction formulated, an operation control section (28) controls operation of respective devices equipped to the vehicle, including lights, antennae, and the like, so that the vehicle performs such expression operation.