A cookware surface comprises a corrugated surface.

The plates have a roughened surface or a corrugated surface.

A power supply includes a rotor having an undulated surface (658, 858, 958, 10, 58) and a magnetostrictive material disposed adjacent to the undulated surface.

The transducers (332) are coupled by a member (330) defining a waved surface, and each transducer defines a coupler (430) in contact with the waved surface for movement following the waved surface.

The wings may include an undulating surface.

The second lateral side includes a second undulating surface.

The first lateral side includes a first undulating surface.

The constant velocity coupling additionally comprises an output shaft having a second wave surface thereupon, wherein the second wave surface comprises mounds and valleys.

The container has releasable sidewalls and a lid wherein the sidewalls and lid have at least one corrugated surface that can mate with the corrugated upper surface of the pallet.

The optical element of the present invention comprises an optical layer in which a corrugated face is provided on the surface thereof, and a wavelength-selective reflecting layer provided on the corrugated face.

At this time, the plastic resin has an undulating surface.

An optical antireflection structure, comprising an undulating surface structure, and a nanometer columnar structure located on the undulating structure.

At least a portion of the side wall can have a corrugated surface.

The average thickness of the microfiltration layer (3) in the troughs (6) in the uneven surface is greater than that in the ridges (5) in the uneven surface, and the undulating filter surface (3A) is formed into a smooth curved surface.

Disclosed herein is a constant velocity coupling of a new design and manufacture comprising an input shaft having a first wave surface thereupon, wherein the first wave surface comprises mounds and valleys.