搜尋結果
An infrared spectroscopy correlation table (or table of infrared absorption frequencies) is a list of absorption peaks and frequencies, typically reported in wavenumber, for common types of molecular bonds and functional groups. [1] [2] In physical and analytical chemistry, infrared spectroscopy (IR spectroscopy) is a technique used to identify ...
The High-frequency Active Auroral Research Program ( HAARP) is a University of Alaska Fairbanks program which researches the ionosphere – the highest, ionized part of Earth's atmosphere . The most prominent instrument at HAARP is the Ionospheric Research Instrument (IRI), a high-power radio frequency transmitter facility operating in the high ...
On January 6, 2021, the United States Capitol Building in Washington, D.C., was attacked by a mob[34][35][36] of supporters of then-U.S. president Donald Trump, two months after his defeat in the 2020 presidential election. They sought to keep Trump in power by occupying the Capitol and preventing a joint session of Congress counting the ...
Jared Bernstein (born December 26, 1955)[1] is an American government official who is the chair of the United States Council of Economic Advisers. He is a senior fellow at the Center on Budget and Policy Priorities.[2] From 2009 to 2011, Bernstein was the chief economist and economic adviser to Vice President Joe Biden in the Obama ...
The Manhattan Project was a program of research and development undertaken during World War II to produce the first nuclear weapons. It was led by the United States in collaboration with the United Kingdom and Canada. From 1942 to 1946, the project was under the direction of Major General Leslie Groves of the U.S. Army Corps of Engineers ...
PubMed. PubMed is a free database including primarily the MEDLINE database of references and abstracts on life sciences and biomedical topics. The United States National Library of Medicine (NLM) at the National Institutes of Health maintains the database as part of the Entrez system of information retrieval.
The Human Development Index ( HDI) is a statistical composite index of life expectancy, education (mean years of schooling completed and expected years of schooling upon entering the education system ), and per capita income indicators, which is used to rank countries into four tiers of human development. A country scores a higher level of HDI ...
