Abstract: A two-dimensional photonic crystal laser includes: electrodes; an active layer; and a two-dimensional photonic crystal layer in which modified refractive index regions are disposed to be shifted by different shift amounts from respective lattice points or/and are disposed at the respective lattice points with different areas, the shift amount or/and the area is/are modified with a composite modulation period and expressed by a modulation phase ?(r?) expressed using a vector r? indicating a position of each lattice point of the two-dimensional lattice, a vector kn? indicating a combination of an inclination angle and an azimuthal angle of each of n laser beams mutually differing in the inclination angle and/or the azimuthal angle, and an amplitude An and a phase exp(i?n) determined for each n and the amplitude An and/or the phase exp(i?n) for each value of n differ(s) from each other in at least two different values of n.

Abstract: A two-dimensional photonic-crystal surface-emitting laser includes: a two-dimensional photonic-crystal layer; an active layer provided on one surface side of the two-dimensional photonic-crystal layer; and a reflection layer provided on the other surface side of the two-dimensional photonic-crystal layer or on a side opposite to the two-dimensional photonic-crystal layer so as to be spaced apart from the two-dimensional photonic-crystal layer, wherein a distance d between surfaces of the two-dimensional photonic-crystal layer and the reflection layer facing each other is set such that a radiation coefficient difference ??v=(?v1??v0), which is a value obtained by subtracting a radiation coefficient ?v0 of a fundamental mode having the smallest loss from a radiation coefficient ?v1 of a first higher order mode having the second smallest loss among the light amplified in the two-dimensional photonic-crystal layer, is 1 cm?1 or more.

Abstract: A radial tire for airplane comprises a pair of bead cores, a radial carcass, and a belt disposed on an outer periphery of a crown portion of the radial carcass and comprised of plural belt layers each containing organic fiber cords, in which a total strength in a circumferential direction over a full width of the belt Tbelt(N) satisfies Tbelt/WD?1.5×106 when an outer diameter of the tire is D (m) and a width of the tire is W (m), and at least one layer of the belt layers is constituted with an organic fiber cord spirally winding at an angle of approximately 0° with respect an equatorial plane of the tire and satisfying the following equations (I) and (II): ???0.01E+1.2??(I) ??0.02??(II) (wherein ? is a heat shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49 N (cN/dtex)).

Abstract: A pneumatic radial tire for airplane comprises a pair of bead cores, a radial carcass comprised of at least two carcass plies, in which the radial carcass is comprised of at least one turnup ply having a main body portion and a turnup portion and at least one down ply, wherein a radially total strength Tply (N) of the organic fiber cords constituting the main body portion of the turnup ply and the down ply at a position corresponding to a maximum width of the tire, a maximum tire width W (m) and a tire outer diameter D (m) satisfies the following equation (I): Tply/WD?4.0×106??(I) and the organic fiber cord constituting at least one ply of the at least two carcass plies is a polyketone fiber cord satisfying the following equations (II) and (III): ???0.01E+1.2??(II) ??0.02??(III) (wherein ? is a heat shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49 N (cN/dtex)).

Abstract: A radial tire for airplane comprises a pair of bead cores, a radial carcass, and a belt disposed on an outer periphery of a crown portion of the radial carcass and comprised of plural belt layers each containing organic fiber cords, in which a total strength in a circumferential direction over a full width of the belt Tbelt(N) satisfies Tbelt/WD?1.5×106 when an outer diameter of the tire is D (m) and a width of the tire is W (m), and at least one layer of the belt layers is constituted with an organic fiber cord extending zigzag in the circumferential direction and satisfying the following equations (I) and (II): ???0.01E+1.2??(I) ??0.02??(II) (wherein ? is a heat shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49 N (cN/dtex)).

Abstract: A radial tire for airplane comprises a pair of bead cores, a radial carcass, and a belt disposed on an outer periphery of a crown portion of the radial carcass and comprised of plural belt layers each containing organic fiber cords, in which a total strength in a circumferential direction over a full width of the belt Tbelt(N) satisfies Tbelt/WD?1.5×106 when an outer diameter of the tire is D (m) and a width of the tire is W (m), and at least one layer of the belt layers is constituted with an organic fiber cord extending zigzag in the circumferential direction and satisfying the following equations (I) and (II): ???0.01E+1.2 ??(I) ??0.02??(II) (wherein ? is a heat shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49 N (cN/dtex)).

Abstract: A radial tire for airplane comprises a pair of bead cores, a radial carcass, and a belt disposed on an outer periphery of a crown portion of the radial carcass and comprised of plural belt layers each containing organic fiber cords, in which a total strength in a circumferential direction over a full width of the belt Tbelt(N) satisfies Tbelt/WD?1.5×106 when an outer diameter of the tire is D (m) and a width of the tire is W (m), and at least one layer of the belt layers is constituted with an organic fiber cord spirally winding at an angle of approximately 0° with respect an equatorial plane of the tire and satisfying the following equations (I) and (II): ???0.01E+1.2 ??(I) ??0.02 ??(II) (wherein ? is a heat shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49 N (cN/dtex)).