The Jet Engine Essay Example | Topics and Well Written Essays - 1500 words

The Jet Engine - Essay Example Fuel and air is mixed and ignited inside the cavity of the engine. However, jet engines are different for other type of internal combustion engines, as they have no pistons. Jet engines have lesser moving parts as compared to the piston based internal combustion engine. The main parts of the jet engines or gas turbine engine are turbine, compressor, fuel ignition system and a connection rod that connects turbine and compressor. The compressor, ignition system (burner) and the turbines are the core of the jet engine. The word gas generator refers the core of the jet engines as hot gases are produced within the core of the jet engines. The compressor compresses the air inside the engine. The compressed air is mixed with fuel and ignited. Due to the ignition, the fuel burns rapidly in the presence of air and hot gases rush out of the engine through the turbine. The turbine rotates as the hot gases rush out of the engine due to the aerodynamic energy (Birch 2001, p.74). Turbine and compressor are connected with a same shaft. The rotation of the turbine rotates the compressor that compresses more air into the engine. Jet engine output is evaluated with respect to the thrust it produces. Each jet engine in the aircraft produces thrust that makes the aircraft to move forward (Soares, 2008, p.67). The motion in the aircraft verifies Newton’s third law that states, â€Å"For every action there is an equal and opposite reaction† (Holzner 2011, p.45). The thrust of the engine is in the backward direction that produces an opposite and equal amount of force in the airplane and airplane moves in the forward direction. Forward momentum allows the locomotive having jet engine to move in forward direction. Forward momentum depends on the net thrust. Net thrust of a jet engine makes the airplane or any other locomotive to move in the forward direction. However, in case when there is no forward momentum, the

Human and Animal Interrelationships Term Paper Example | Topics and Well Written Essays - 1000 words

Human and Animal Interrelationships - Term Paper Example nimal research") The significance of such experiments is difficult to exaggerate, however it is important to prove the necessity and the role of such researches. The main advances that changed the medicine due to animal research are discovery of penicillin, first antibiotic for tuberculosis, medicine for meningitis, vaccine for poliomyelitis, introduction of kidney transplantation and many others ("Medical advances and animal research") All the researches, mentioned above, used mice in the experiments, which together with rats are the most popular animals of medical research. Rats and mice are inexpensive, unpretentious in care and food, live only for 2 or 3 years. The discoveries, which were made as a result of the experiments with mice and rats, helped their authors to win more than 30 Nobel Prizes. One of the significant discoveries, which engaged mice together with rabbits, was development of in vitro fertilization, which was performed by Robert Edwards in 1950-1960s. However he received his Nobel Prize only in 2010. This discovery helped the infertile families to have babies: more than 4 million of people were born due to the results of experiments ("The Nobel Prize in Physiology or Medicine 2010. Robert G. Edwards"). Another fatal disease, for which the scientists hope to find the treatment using animal research, is Duchene dystrophy. Duchene muscular dystrophy is one of the most widespread forms of muscles dystrophy. The gene, which is responsible for muscle development, is corrupted, and muscles cells eventually die in the organism. The disease is congenital and affects mostly boys. There is no treatment for Duchene dystrophy at present, however scientists hope to find one soon with the help of animals, which are used for testing agents, that might help to reverse the deadly processes in muscles. The Italian scientists experimented with using stem cells from the blood vessels of dogs to treat their natural dystrophy mutation, which helped to stop its