The above description is the basic idea of what is going on with the Yagi-Uda antenna. Yagi antenna design is done most often via measurements, and sometimes computer simulations. For instance, let's look at a two-element Yagi antenna (1 reflector, 1 feed element, 0 directors).
Though there are no detailed records of when the sport of track and field began, experts say that track and field history can be traced back to 776 B.C. Track and Field History Experts say that track and field history can be traced back to 776 B.C when a cook named Koroibos, from Elis, won a race that was run over 600 feet distance. It is believed that this was the only athletic event for the initial 13 Olympic Games.
Track Cycling Events-Keirin. The Keirin is a mass start Track Cycling event for Sprinters, created in 1948 in Japan but not included in the Olympic programme until 2000.Traditionally only six riders contest a Keirin but the number of riders can vary on the event, for example in the Japanese Keirin Series nine riders line up for each event.apanese Keirin races start with all nine riders presented to the crowd and bowing in respect before attaching their bikes to the starting gate. Each rider is assigned a number and colour for betting purposes in order to make them easily recognisable to the crowd.