A process for the production of cyclic carbonates comprising contacting an epoxide with carbon dioxide in the presence of a dimeric aluminum catalyst, and a co-catalyst capable of supplying Y\u2212, where Y is selected from Cl, Br and I, where the dimeric aluminum catalyst is of formula I:. The image display device projects an image based on a test pattern that includes a reference mark indicating horizontal and vertical reference positions by a mixed color of color components of the mutually differing color components, and bar marks arranged at specific intervals in the horizontal and vertical directions relative to the reference mark, for each color component, is used. The articles typically do not delaminate even when soaked in water, and are biodegradable. The coupling method includes a electromagnetic wave power dividing section and mode converting section, of which the power divider and dividing method can divide the electromagnetic wave proportionally. A spacer element is arranged between the nut body and the cage and comprises at least one spring element that acts perpendicularly in relation to the axial direction of the internal thread. The molds are preferably formed of silicon and infrared radiation is preferably used to heat the sheet.