Abstract: A semiconductor device according to an embodiment includes: a first nitride semiconductor layer having a first surface and a second surface; a first source electrode provided on the first surface; a first drain electrode provided on the first surface; a first gate electrode provided on the first surface between the first source electrode and the first drain electrode; a second nitride semiconductor layer having a third surface and a fourth surface, the third surface being provided on the second surface and facing the second surface, and the second nitride semiconductor layer having a smaller band gap than the first nitride semiconductor layer; and a first semiconductor device having a fifth surface provided on the fourth surface and facing the fourth surface with a size equal to or smaller than a size of the fourth surface, the first semiconductor device including a first semiconductor material having a smaller band gap than the second nitride semiconductor layer.

Abstract: A bicycle component comprises a first structural member made of a conducting material, an electrical insulation layer provided to the first structural member, and a second structural member configured to be attached to the electrical insulation layer by adhesive.

Abstract: A bicycle rear sprocket assembly 28 comprises a sprocket carrier 31, at least one metallic support 33, and at least one rear sprocket 28a-28h. The sprocket carrier 31 is made of a non-metallic material. The at least one metallic support 33 is attached to at least one of a first circumferentially facing surface 41 and a second circumferentially facing surface 43 of at least one mounting arm 39 of the sprocket carrier 31. The at least one rear sprocket 28a-28h is made of a metallic material. A sprocket body 51 of the at least one rear sprocket 28a-28h is attached to the at least one metallic support 33.

Abstract: A bicycle disc brake rotor is basically provided with a main body and a heat release layer. The main body is made of a metallic material. The main body includes an outer portion, an inner portion and a cooling facilitation part. The outer portion has oppositely facing braking surfaces. The heat release layer includes a non-metallic material. The heat release layer at least partially overlies the cooling facilitation part.

Abstract: A rolled aluminum alloy material is provided with excellent strength and press workability and with which a poor and patchy appearance is less likely to occur after the alumite treatment. The rolled aluminum alloy material can be utilized for components of a bicycle crank. The rolled aluminum alloy material has a component composition comprising 0.6-1.4 wt % of Mg, 0.3-1.0 wt % of Si, 0.1-0.5 wt % of Cu, 0.02-0.4 wt % of Cr, and 0.1-0.6 wt % of Mn, and Al and inevitable impurities as the remainder.

Abstract: A bicycle rear sprocket assembly 28 comprises a sprocket carrier 31, at least one metallic support 33, and at least one rear sprocket 28a-28h. The sprocket carrier 31 is made of a non-metallic material. The at least one metallic support 33 is attached to at least one of a first circumferentially facing surface 41 and a second circumferentially facing surface 43 of at least one mounting arm 39 of the sprocket carrier 31. The at least one rear sprocket 28a-28h is made of a metallic material. A sprocket body 51 of the at least one rear sprocket 28a-28h is attached to the at least one metallic support 33.

Abstract: A bicycle disc brake rotor is provided with a base rotor plate and a surface region. The base rotor plate includes an outer portion that is formed of iron. The outer portion has first and second base surfaces facing in opposite axial directions. The surface region is formed by a diffusion process on the base rotor plate. The surface region has a corrosion resistant characteristic which is superior to the base rotor plate.

Abstract: A disc brake caliper is basically provided with a caliper housing, a brake pad and an intermediate member. The caliper housing defines a slot that is configured to receive a brake rotor. The caliper housing is made of a first material. The brake pad includes a mounting plate. The brake pad is disposed in the slot. The intermediate member is disposed between the caliper housing and the brake pad. The intermediate member is made of a second material having a thermal conductivity that is smaller than a thermal conductivity of the first material.

Abstract: A bicycle disc brake rotor, having a rotational center axis, comprises an outer portion having plural layers including first and second braking surfaces in opposite axial directions. The plural layers include a first layer made of a copper or a copper alloy.

Abstract: A bicycle component comprises a first structural member made of a conducting material, an electrical insulation layer provided to the first structural member, and a second structural member configured to be attached to the electrical insulation layer by adhesive.

Abstract: A bicycle rim basically includes a first annular side surface portion, a second annular side surface portion, an annular connecting portion and an outermost layer. The first annular side surface portion includes a first braking surface. The second annular side surface portion includes a second braking surface. The epoxy resin layer is an example of a nonmetallic layer. The annular connecting portion connects the first and second annular side surface portions. The soft additive granules are disposed in at least one of the first and second annular side surface portions. The epoxy resin layer is disposed in at least one of the first and second annular side surface portions. The soft additive granules are at least partially embedded in the epoxy resin layer. The outermost layer covers the epoxy resin layer and the soft additive granules.

Abstract: A bicycle brake pad includes a friction member and a first support member. The friction member includes a first intermetallic compound. The friction member and the first support member are, at least partially, chemically coupled to each other.

Abstract: A bicycle disc brake rotor that further increases heat dissipation has a rotation axis. The bicycle disc brake rotor includes at east one outer circumferential portion, which includes at least one brake surface, and first and second inner circumferential parts, which are coupled to the outer circumferential portion. Each of the first and second inner circumferential parts is at least partially located radially inward from the outer circumferential portion with respect to the rotation axis. The first and second inner circumferential parts are arranged to form a gap in between in an axial direction that extends parallel to the rotation axis. At least one of the first and second inner circumferential parts includes at least one cooling enhancement section. The cooling enhancement section includes at least one opening that is in communication with the gap.

Abstract: A bicycle sprocket is provided that is configured to limit a chain separation. The bicycle sprocket includes a sprocket body and a plurality of teeth. The sprocket body has a rotational center axis. The plurality of teeth includes a first tooth having a first width extending in a rotational center axis direction, and a second tooth having a second width extending in the rotational center axis direction. The second width is smaller than the first width. The plurality of teeth includes a base body and a nickel plating layer. The nickel plating layer covers at least a portion of the base body. The nickel plating layer includes at least one of phosphorus and boron.

Abstract: A disc brake caliper is basically provided with a caliper housing, a brake pad and an intermediate member. The caliper housing defines a slot that is configured to receive a brake rotor. The caliper housing is made of a first material. The brake pad includes a mounting plate. The brake pad is disposed in the slot. The intermediate member is disposed between the caliper housing and the brake pad. The intermediate member is made of a second material having a thermal conductivity that is smaller than a thermal conductivity of the first material.

Abstract: A disc brake caliper is basically provided with a caliper housing, a brake pad and an intermediate member. The caliper housing defines a slot that is configured to receive a brake rotor. The brake pad is disposed in the slot. The intermediate member is disposed between the caliper housing and the brake pad.

Abstract: A bicycle disc brake rotor, having a rotational center axis, comprises an outer portion having plural layers including first and second braking surfaces in opposite axial directions. The plural layers include a first layer made of a copper or a copper alloy.

Abstract: A bicycle rim basically includes a first annular side surface portion, a second annular side surface portion, an annular connecting portion and an outermost layer. The first annular side surface portion includes a first braking surface. The second annular side surface portion includes a second braking surface. The epoxy resin layer is an example of a nonmetallic layer. The annular connecting portion connects the first and second annular side surface portions. The soft additive granules are disposed in at least one of the first and second annular side surface portions. The epoxy resin layer is disposed in at least one of the first and second annular side surface portions. The soft additive granules are at least partially embedded in the epoxy resin layer. The outermost layer covers the epoxy resin layer and the soft additive granules.

Abstract: A brake plate assembly in a drag mechanism of a fishing reel includes a first brake plate and a second brake plate. The first brake plate has a first bonding surface. The second brake plate has a second bonding surface bonded to the first bonding surface, and has greater wear resistance than that of the first brake plate.

Abstract: A bicycle sprocket includes a sprocket body, and a plurality of sprocket teeth. At least one of the sprocket teeth includes a first layered member, a second layered member and a third layered member. The first layered member has a first axial surface and a second axial surface. The second layered member is attached to the first axial surface such that the first and second layered members overlap each other in an axial direction as viewed parallel to a rotational axis of the sprocket body. The third layered member is attached to the second axial surface such that the first and third layered members overlap each other in the axial direction as viewed parallel to the rotational axis of the sprocket body. The first layered member has a specific gravity that is less than those of the second layered member and the third layered member.