Analysis of Circular Reinforced Concrete Long Columns Confined with Carbon Fiber Reinforced Plastic Sheets under Small Eccentric Compression.

Reaction vessel construction is provided whereby in the practice of the invention disclosed in U.S. Pat. No. 3,297,407 - Wentorf, Jr. diamond seed material is isolated from the main supply of catalyst-solvent metal by an inert barrier insoluble in the catalyst-solvent bath. One or more restricted diamond growth paths (e.g. small diameter wires of catalyst-solvent) are provided through the inert barrier interconnecting diamond seed material and the main supply of catalyst-solvent metal. In this way the diamond seed material cannot be eroded or destroyed by exposure to the bath of catalyst-solvent metal and a controllable limit can be placed on the size of the single diamond seed crystal ultimately presented to the bath via any given growth path.