2000 B.C - The first recorded (The Susruta Samhita, Sanskrit writing) water purification began with the Egyptians. It is said that impure water should be boiled over a fire, heated in the sun, have a hot iron dipped into it or purified by filtration through sand and course gravel.
A major step in the development of desalination technologies came in the 1940s during World War II when various m
Technologies
Hybrid
The hybrid car has two power sources – an engine and a secondary cell. These sources work respectively or simultaneously according to the driving condition to increase efficiency. Hybrid cars run on battery power at low speeds and switch to traditional internal-combustion at higher speeds. Since the capability of a secondary battery is not enough to replace the exi
Refund rate 0.25%, profits about 10 million dollars per year. This is the result of the world's most largest internet bookstore, amazon.com, which opened in 1994.
During the 1990s when internet technology began to spread through the public, Amazon.com’s CEO, Jeffry P. Bezos, realized that internet users were increasing about 2400% a year. So he decided to start a business based on Internet. H
Ⅰ. Introduction
1) Location
Russia is located in the north Eurasia continent (Far East Asia ~ Europe). Russia is the largest country in the world which is about 1/8 of the world’s land area. Because of this huge territory, there is an 11-hour time difference between East and West.
2) Climate
The huge territory of Russia also makes a various climate zone. Basically, Russia has continental
1.2. 재료가 사용된 이유
투명 전도막(TCO : Transparent Conductive Oxide)이란, 가시광 영역에서 광 투과율이 우수해야 하고, 높은 전기전도도와 적절한 에칭 특성을 지녀야 한다. ITO는 가시광선 영역 (400nm ~ 700nm)에서 80%정도의 투과도를 가지며 optical band gap이 3.55eV를 가짐으로 인하여 가시광선 영역에서 높은