Abstract: A pneumatic tire comprises a tread portion provided with a pair of circumferential grooves and axial grooves extending from the circumferential grooves to tread edges, each of the axial grooves extending along a parabola of which the parabola axis extends parallel to the tire axial direction and the parabola vertex is disposed on the axially outer edge of the circumferential groove and the parabola focus disposed axially outward of the parabola vertex, and the axially outer edge of the axial groove extending on the parabola from the parabola vertex to the tread edge, whereby a flow of water is improved and thus a flow of air is also improved to improve wet performances without increasing tire noise.

Abstract: A capacitor comprising: a porous sintered body 2 consisting mainly of titanium; a dielectric film 3 which is formed on the surface of the sintered body and which consists mainly of a perovskite type composite oxide having a general formula of ATiO.sub.3 ; a conductor or semiconductor which is formed on the surface of the dielectric film; and a counter-electrode which conducts to the conductor or semiconductor and which faces the sintered body; wherein the porosity of the porous sintered body is 20% or more. The capacitor is fabricated by immersing the porous sintered body in an aqueous solution containing strontium or barium, by performing a hydrothermal treatment at a specified temperature to form a composite oxide film having the above-described general formula as a dielectric film 3 on the surface of the sintered body; by forming a conductor or semiconductor electrode 4 on the surface of the oxide film; and by forming a counter electrode which conducts to the electrode and which faces the sintered body.

Abstract: A pneumatic tire with a low aspect ratio of 0.55 to 0.70 comprising a tread provided with four circumferential grooves disposed symmetrically about the tire equator plane to divide the tread into axially spaced five land portions, at least one of the five land portions having a set of lateral grooves crossing the land portion. A sea area ratio Ss/S of a total area Ss of grooves to a total area S of a tread surface is 0.20 to 0.27. A distance La from the tire equator plane to the inner groove edge of the inner circumferential groove among the four circumferential grooves is 0.090 to 0.125 times a tread width TW, and a distance Lb from the tire equator plane to the inner groove edge of the outer circumferential groove among the four circumferential grooves is 2.5 to 3.0 times the distance La.

Abstract: A pneumatic tire having an improved carcass structure capable of increasing the sidewall rigidity, the tire (1) comprising a carcass (8) composed of an inner carcass ply (9) and an outer carcass ply (10), the inner carcass ply having a pair of edges turned up around the bead cores (5) from the axially inside to outside of the tire, each turned up portion thereof extending radially outwardly beyond the maximum tire width point (B), a bead apex (6) disposed between the main portion and the turned up portion, the outer carcass ply having a pair of edges each disposed between the bead apex and each turned up portion of the inner carcass ply, the edges of the outer carcass ply terminated radially outward of the radially inner end of the bead core, each sidewall portion provided with at least one steel cord reinforcing layer (11a, 11b, 11c) made of parallel steel cords.