Epidemiology is concerned with the incidence of disease in populations and does not address the question of the cause of an individual's disease.This question, sometimes referred to as specific causation, is beyond the domain of the science of epidemiology.he subdiscipline of forensic epidemiology is directed at the investigation of specific causation of disease or injury in individuals or groups of individuals in instances in which causation is disputed or is unclear, for presentation in legal settings.
Major system characteristics. Tacan stands for Tactical Air Navigation and is a system which, working in the u.h.f. band, between 962 and 1,214 Mc/s, gives to a pilot continuous information as to his range and bearing from a beacon.
How Glue Guns Work. The glue gun is a hand held tool into which you feed a solid glue stick. A heating element in the body of the gun melts the glue, and the adhesive flows out the glue gunâs metal, cone-shaped tip.nother feature to consider is whether you want a trigger-fed gun or a push-fed model. With the trigger feed, you slip the glue stick into the hole at the back of the gun, and each pull of the trigger advances the stick into the heater and out through the nozzle.