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NIST
The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness. NIST's activities are organized into physical science laboratory programs that include nanoscale science and technology, engineering, information technology, neutron research, material measurement, and physical measurement. From 1901 to 1988, the agency was named the National Bureau of Standards. History Background The Articles of Confederation, ratified by the colonies in 1781, provided: The United States in Congress assembled shall also have the sole and exclusive right and power of regulating the alloy and value of coin struck by their own authority, or by that of the respective states—fixing the standards of weights and measures throughout the United States. Article 1, section 8, of the Constitution of the United States, ratified in 1789, granted these powers to the new Congr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metrology
Metrology is the scientific study of measurement. It establishes a common understanding of units, crucial in linking human activities. Modern metrology has its roots in the French Revolution's political motivation to standardise units in France when a length standard taken from a natural source was proposed. This led to the creation of the decimal-based metric system in 1795, establishing a set of standards for other types of measurements. Several other countries adopted the metric system between 1795 and 1875; to ensure conformity between the countries, the Bureau International des Poids et Mesures (BIPM) was established by the Metre Convention. This has evolved into the International System of Units (SI) as a result of a resolution at the 11th General Conference on Weights and Measures (CGPM) in 1960. Metrology is divided into three basic overlapping activities: * The definition of units of measurement * The realisation of these units of measurement in practice * Traceabil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gaithersburg, Maryland
Gaithersburg ( ), officially the City of Gaithersburg, is a city in Montgomery County, Maryland, United States. At the time of the 2020 U.S. Census, Gaithersburg had a population of 69,657, making it the ninth-largest location in the state. Gaithersburg is located to the northwest of Washington, and is considered a suburb and a primary city within the Washington–Arlington–Alexandria, DC–VA–MD–WV Metropolitan Statistical Area. Gaithersburg was incorporated as a town in 1878 and as a city in 1968. Gaithersburg is located east and west of Interstate 270. The eastern section includes the historic area of the town. Landmarks and buildings from that time can still be seen in many places but especially in the historic central business district of Gaithersburg called "Olde Towne". The east side also includes Lakeforest Mall, City Hall, and the Montgomery County Fair grounds, and Bohrer Park (a well-known joint community recreation center and outdoor water park for kids and f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Under Secretary Of Commerce For Standards And Technology
The Under Secretary of Commerce for Standards and Technology, or USC(ST), is a high-ranking official in the United States Department of Commerce and the principal advisor to the United States Secretary of Commerce on the technological development. The Under Secretary is dual hatted as the Director of the National Institute of Standards and Technology within the Commerce Department. The Under Secretary is appointed by the President of the United States with the consent of the United States Senate to serve at the pleasure of the President. The current Under Secretary is Laurie E. Locascio, who was appointed by President Joe Biden and assumed office on April 19, 2022. Locascio is a biomedical researcher, former National Institute of Standards and Technology (NIST) official, and current Vice President for Research at two University of Maryland locations. Overview As the Director of NIST, the Under Secretary is responsible for promoting American innovation and industrial competitiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harry Diamond (engineer)
Harry Diamond (12 February 1900 – 21 June 1948) was an American radio pioneer and inventor, and namesake for Diamond Ordnance Fuze Laboratories, which later became part of the Army Research Laboratory. Early life Diamond, the son of a Jewish tailor in Minsk, was born on February 12, 1900. In 1908 his family immigrated to the United States, and he grew up in Quincy, Massachusetts. Diamond enlisted in the United States Army on October 14, 1918 and was honorably discharged on December 9, 1918. He graduated with a degree in Electrical Engineering from Massachusetts Institute of Technology in 1922. Diamond worked for the General Electric company for 18 months. He completed his master's degree in Electrical Engineering in 1925 and worked as an Electrical Engineering instructor for 4 years at Lehigh University in electrical engineering. Bureau of Standards He joined the National Bureau of Standards in 1927. Diamond headed up the research and development work of the Commerce Departme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Department Of The Treasury
The Department of the Treasury (USDT) is the national treasury and finance department of the federal government of the United States, where it serves as an executive department. The department oversees the Bureau of Engraving and Printing and the U.S. Mint. These two agencies are responsible for printing all paper currency and coins, while the treasury executes its circulation in the domestic fiscal system. The USDT collects all federal taxes through the Internal Revenue Service; manages U.S. government debt instruments; licenses and supervises banks and thrift institutions; and advises the legislative and executive branches on matters of fiscal policy. The department is administered by the secretary of the treasury, who is a member of the Cabinet. The treasurer of the United States has limited statutory duties, but advises the Secretary on various matters such as coinage and currency production. Signatures of both officials appear on all Federal Reserve notes. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neutron
The neutron is a subatomic particle, symbol or , which has a neutral (not positive or negative) charge, and a mass slightly greater than that of a proton. Protons and neutrons constitute the nuclei of atoms. Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons. Their properties and interactions are described by nuclear physics. Protons and neutrons are not elementary particles; each is composed of three quarks. The chemical properties of an atom are mostly determined by the configuration of electrons that orbit the atom's heavy nucleus. The electron configuration is determined by the charge of the nucleus, which is determined by the number of protons, or atomic number. The number of neutrons is the neutron number. Neutrons do not affect the electron configuration, but the sum of atomic and neutron numbers is the mass of the nucleus. Atoms of a chemical element t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samuel Wesley Stratton
Samuel Wesley Stratton (July 18, 1861 – October 18, 1931) was an administrator in the American government, physicist, and educator. Life and work Stratton was born on farm in Litchfield, Illinois on July 18, 1861. In his youth he kept farm machinery in repair and worked as a mechanic and carpenter. He worked his way through Illinois Industrial University at Urbana (later the University of Illinois), receiving his bachelor of science degree in mechanical engineering in 1884. He became an instructor in mathematics and physics following his graduation, and in 1889, when Physics department head Theodore B. Comstock, Professor of Mining Engineering and Physics, inexplicably failed to return to campus after the summer vacation, Stratton was appointed head of the Department of Physics by regent Selim Hobart Peabody. As Physics head, Stratton organized a formal curriculum in electrical engineering, which was taught in the Physics Department until a separate department of electrical e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Department Of Commerce
The United States Department of Commerce is an executive department of the U.S. federal government concerned with creating the conditions for economic growth and opportunity. Among its tasks are gathering economic and demographic data for business and government decision making, and helping to set industrial standards. Its main purpose is to create jobs, promote economic growth, encourage sustainable development and block harmful trade practices of other nations. Steve Charnovitz, "Reinventing the Commerce Dept.", ''Journal of Commerce'', July 12, 1995. It is headed by the Secretary of Commerce, who reports directly to the President of the United States and is a member of the president's Cabinet. The Department of Commerce is headquartered in the Herbert C. Hoover Building in Washington, DC. History Organizational history The department was originally created as the United States Department of Commerce and Labor on February 14, 1903. It was subsequently renamed the Departme ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crown Glass (optics)
Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low dispersion (with Abbe numbers around 60). Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses. As well as the specific material named ''crown glass'', there are other optical glasses with similar properties that are also called crown glasses. Generally, this is any glass with Abbe numbers in the range 50 to 85. For example, the borosilicate glass Schott BK7 (Schott designates it as 517642. The first three digits tell you its refractive index (1.517) and the last three tell you its Abbé number (64.2))The crown/flint distinction is so important to optical glass technology that many glass names, notably Schott glasses, incorporate it. A ''K'' in a Schott name indicates a crown glass (''Krone'' in German — Schott is a German company). The ''B'' in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fighting occurring throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia. An estimated 9 million soldiers were killed in combat, plus another 23 million wounded, while 5 million civilians died as a result of military action, hunger, and disease. Millions more died in genocides within the Ottoman Empire and in the 1918 influenza pandemic, which was exacerbated by the movement of combatants during the war. Prior to 1914, the European great powers were divided between the Triple Entente (comprising France, Russia, and Britain) and the Triple Alliance (containing Germany, Austria-Hungary, and Italy). Tensions in the Balkans came to a head on 28 June 1914, following the assassination of Archduke Franz Ferdi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antifreeze
An antifreeze is an additive which lowers the freezing point of a water-based liquid. An antifreeze mixture is used to achieve freezing-point depression for cold environments. Common antifreezes also increase the boiling point of the liquid, allowing higher coolant temperature. However, all common antifreeze additives also have lower heat capacities than water, and do reduce water's ability to act as a coolant when added to it. Because water has good properties as a coolant, water plus antifreeze is used in internal combustion engines and other heat transfer applications, such as HVAC chillers and solar water heaters. The purpose of antifreeze is to prevent a rigid enclosure from bursting due to expansion when water freezes. Commercially, both the ''additive'' (pure concentrate) and the ''mixture'' (diluted solution) are called antifreeze, depending on the context. Careful selection of an antifreeze can enable a wide temperature range in which the mixture remains in the liquid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Herbert Hoover
Herbert Clark Hoover (August 10, 1874 – October 20, 1964) was an American politician who served as the 31st president of the United States from 1929 to 1933 and a member of the Republican Party, holding office during the onset of the Great Depression in the United States. A self-made man who became rich as a mining engineer, Hoover led the Commission for Relief in Belgium, served as the director of the U.S. Food Administration, and served as the U.S. Secretary of Commerce. Hoover was born to a Quaker family in West Branch, Iowa, but he grew up in Oregon. He was one of the first graduates of the new Stanford University in 1895. He took a position with a London-based mining company working in Australia and China. He rapidly became a wealthy mining engineer. In 1914 at the outbreak of World War I, he organized and headed the Commission for Relief in Belgium, an international relief organization that provided food to occupied Belgium. When the U.S. entered the war in 191 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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