Solar energy is radiant light and heat from the Sun harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics, solar thermal energy, solar architecture and artificial photosynthesis.
It is an important source of renewable energy and its technologies are broadly characterized as either passive solar or active solar depending on the way they capture and distribute solar energy or convert it into solar power. Active solar techniques include the use of photovoltaic systems, concentrated solar power and solar water heating to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.
The large magnitude of solar energy available makes it a highly appealing source of electricity. The United Nations Development Programme in its 2000 World Energy Assessment found that the annual potential of solar energy was 1,575–49,837 exajoules (EJ). This is several times larger than the total world energy consumption, which was 559.8 EJ in 2012.
Solar Energy is a peer-reviewed scientific journal covering research on solar energy such as photovoltaics and solar heating, but also its indirect usages like wind power or bioenergy. It is published by Elsevier on behalf of the International Solar Energy Society. The editor-in-chief is Yogi Goswami. According to the Journal Citation Reports, the journal has a 2013 impact factor of 3.541.
Coordinates: 52°N 20°E / 52°N 20°E / 52; 20
Poland (Polish: Polska [ˈpɔlska]), officially the Republic of Poland (Polish: Rzeczpospolita Polska, listen ), is a country in Central Europe,bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine and Belarus to the east; and the Baltic Sea, Kaliningrad Oblast (a Russian exclave) and Lithuania to the north. The total area of Poland is 312,679 square kilometres (120,726 sq mi), making it the 71st largest country in the world and the 9th largest in Europe. With a population of over 38.5 million people, Poland is the 34th most populous country in the world, the 8th most populous country in Europe and the sixth most populous member of the European Union, as well as the most populous post-communist member of the European Union. Poland is a unitary state divided into 16 administrative subdivisions.
The establishment of a Polish state can be traced back to 966, when Mieszko I, ruler of a territory roughly coextensive with that of present-day Poland, converted to Christianity. The Kingdom of Poland was founded in 1025, and in 1569 it cemented a longstanding political association with the Grand Duchy of Lithuania by signing the Union of Lublin. This union formed the Polish–Lithuanian Commonwealth, one of the largest and most populous countries of 16th and 17th-century Europe. The Commonwealth ceased to exist in the years 1772–1795, when its territory was partitioned among Prussia, the Russian Empire, and Austria. Poland regained its independence (as the Second Polish Republic) at the end of World War I, in 1918.
Poland is the name of some places in the U.S. state of New York:
Poland is a historical novel written by James A. Michener and published in 1983 detailing the times and tribulations of three Polish families (the Lubonski family, the Bukowski family, and the Buk family) across eight centuries, ending in the then-present day (1981).
Michener was hired by a television company to travel to a foreign country to shoot a documentary. He was offered support to go anywhere in the world and Michener decided to make the trip to Poland. Following this, Michener made several trips back to Poland and conducted extensive study of Poland's history and culture. He began writing the book in 1979 and it was published four years later.
Like Michener's other works, he includes an acknowledgments section at the beginning of the book; however due to the political turmoil in Poland at the time, Michener decided not to include the names of the people he traveled with for fear of persecutions against them. He writes: "Normally, as I have done in my other novels, I would list their names, their impressive occupations, their achievements in research and scholarship, but I cannot ascertain whether in the present climate this would hurt or help them."