Competitive Service versus Excepted Service Positions. There are two types of non-executive positions in the federal government: 1) those that are in the competitive service, and 2) those that are in the excepted service. Competitive Service â Competitive service positions are subject to the civil service laws passed by Congress.
Post to Facebook. Kevlar inventor Stephanie Kwolek dies at 90 Stephanie Kwolek, the DuPont scientist whose invention, Kevlar, has saved countless lives as the essential ingredient in body armor, has died. Kwolek, of the Sharpley neighborhood in Talleyville, died Wednesday following a brief illness, said her friend, Rita Vasta, who is handling Kwolek's affairs. She was 90.
KevlarÂ® is an extremely strong material that derives its strength from its spider web-like weave. Stephanie Kwolek and Herbert Blades created this special material in 1965 for the Dupont Company.ince then it has been used in a number of ways. To make KevlarÂ®, a special weaving method â known as an aramid weave â is used to turn a liquid into a solid. Aramid fibers tend to be difficult to corrode, resistant to heat, and have no melting point. Chlorine can degrade the material, however.