Abstract: A solar cell, which comprises a substrate, a sub grid electrode and a main grid electrode directly contacting the substrate, wherein the main grid electrode and the sub grid electrode comprise silver particles, and wherein a particle size of the silver particles comprised in the main grid electrode is smaller than a particle size of the silver particles comprised in the sub grid electrode, is provided.

Abstract: A method for producing a solar cell and the solar cell, a silver content in a silver paste used to form a main grid electrode on a surface of a substrate being lower than a silver content in a silver paste used to form a sub grid electrode on the surface of the substrate, are provided.

Abstract: A paste composition for forming a back surface electrode of a solar cell 10 provided by the present invention contains, as solid matter, an aluminum powder, a glass powder, and a composite powder composed of a granular composite material of titanium oxide and an organic or inorganic compound containing silicon. When the total amount of the composite powder, the aluminum powder, and the glass powder is 100% by mass, the composite powder is contained in a ratio of 0.45% by mass or more and 1% by mass or less.

Abstract: A paste composition for forming a back surface electrode of a solar cell 10 provided by the present invention contains, as solid matter, an aluminum powder, a glass powder, and a composite powder composed of a granular composite material of titanium oxide and an organic or inorganic compound containing silicon. When the total amount of the composite powder, the aluminum powder, and the glass powder is 100% by mass, the composite powder is contained in a ratio of 0.45% by mass or more and 1% by mass or less.

Abstract: A retractable seat may include a seat cushion and a seat back rotatably supported on the seat cushion in which one of the seat cushion and the seat back is arranged and constructed to be folded onto the other of the seat cushion and the seat back. At least one of the seat cushion and the seat back includes a frame, a cushion pad, and a linking mechanism. The frame includes a framework and a support member that supports the cushion pad from a backside of the cushion pad. The linking mechanism movably interconnects the framework and the support member and is arranged and constructed to move the support member toward a backside of the at least one of the seat cushion and the seat back when the seat cushion or the seat back is tilted toward a retracted position.

Abstract: A retractable seat may include a seat cushion and a seat back rotatably supported on the seat cushion in which one of the seat cushion and the seat back is arranged and constructed to be folded onto the other of the seat cushion and the seat back. At least one of the seat cushion and the seat back includes a frame, a cushion pad, and a linking mechanism. The frame includes a framework and a support member that supports the cushion pad from a backside of the cushion pad. The linking mechanism movably interconnects the framework and the support member and is arranged and constructed to move the support member toward a backside of the at least one of the seat cushion and the seat back when the seat cushion or the seat back is tilted toward a retracted position.

Abstract: A disclosure is made of a subterranean connecting method and a connecting apparatus therefor which are suitable for use when two shield machines are used to excavate a pair of tunnel sections from both ends of a tunnel, and the tunnel sections are connected to each other in mid course. During underground connection, it is important to secure sealing and water retarding with respect to soil and water pressure exerted by the ground in the vicinity of the connecting section. For this purpose, in the connecting apparatus, a penetration ring is arranged in one of the shield machines, and a penetration chamber in which the penetration ring is accommodated is arranged in the other shield machine. Both the both shield machines face each other with a slight gap remaining therebetween and, subsequently, the penetration ring is moved forward and penetrates into the penetration chamber of the mating shield machine. By this penetration, the area between both the shield machines are closed by the penetration ring.