Aircraft is a machine which is able to by gaining support from the air or atmosphere on the earth. Tha human activity that surrounds an aircraft is called as aviation. The design of aircrafts is done by many factors such as demand, safety protocols, and physical constraints. They use byoancy to float in the air as the way ships float an water. There are many types of aircrafts and are light weight pistons or gas turbines. Scientific journal is a periodical publication intended to further progress of science, usually by reporting novel research. There are thousands of scientific journals in publication, and many more have been published at various points in the past. Most journals are highly specialized, although some of the oldest journals publish articles and scientific papers across a wide range of scientific fields. Scientific journals contain articles that are peer reviewed, to ensure that articles meet the journal's standards of quality, and scientific validity. The publication of the results of research is an essential part of the scientific method. If they are describing experiments or calculations, they must supply enough details that an independent researcher could repeat the experiment or calculation to verify the results. Each such journal article becomes part of the permanent scientific record.
Last date updated on July, 2014