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A pyrgeometer is a device that measures near-surface infra-red (IR) radiation, approximately from 4.5 μm to 100 μm on the electromagnetic spectrum (thereby excluding solar radiation). It measures the resistance / voltage changes in a material that is sensitive to the net energy transfer by radiation that occurs between itself and its ...
AP World History: Modern was designed to help students develop a greater understanding of the evolution of global processes and contacts as well as interactions between different human societies. The course advances understanding through a combination of selective factual knowledge and appropriate analytical skills.
A pyranometer (from Greek πῦρ (pyr) 'fire' and ἄνω (ano) 'above, sky') is a type of actinometer used for measuring solar irradiance on a planar surface and it is designed to measure the solar radiation flux density (W/m 2) from the hemisphere above within a wavelength range 0.3 μm to 3 μm.
Human history or world history is the record of humankind from prehistory to the present. Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers . They migrated out of Africa during the Last Ice Age and had spread across Earth's continental land except Antarctica by the end of the Ice Age 12,000 years ago.
Here are 10 of the tallest skyscrapers around the world that now sit empty or uncompleted — and how they ended up that way. Beirut Trade Center, Beirut (459 feet) The Burj al-Murr or Beirut ...
The teenagers openly talked about their crimes, and their robbery reportedly became such a well-known rumor that police came to Jackson to ask if she’d like to press charges.
World history in the Western tradition is commonly divided into three parts, viz. ancient, medieval, and modern time. [2] The division on ancient and medieval periods is less sharp or absent in the Arabic and Asian historiographies.
President Donald Trump’s administration on Wednesday moved to end the polarizing congestion pricing program that started on Jan. 5 in New York City. U.S. Transportation Secretary Sean Duffy said ...