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Caroline Herzenberg
Caroline Stuart Littlejohn Herzenberg (born March 25, 1932) is an American physicist. Biography Caroline Herzenberg was born Caroline Stuart Littlejohn to Caroline Dorothea Schulze and Charles Frederick Littlejohn on March 25, 1932, in East Orange, New Jersey. In the aftermath of the Great Depression, her parents decided to move to Oklahoma City Oklahoma to join his sister, Hilda Littlejohn Will and her family. Herzenberg grew up and attended public school in Oklahoma City. In 1961 she married Leonardo Herzenberg and is the mother of two grown children, Karen Ann Herzenberg and Catherine Stuart Herzenberg Larson. She lives in Hyde Park, Chicago. After winning the Westinghouse Science Talent Search in high school, Herzenberg attended Massachusetts Institute of Technology. She was one of very few women students at M.I.T. at that time. She was awarded a bachelor's degree by M.I.T. in 1953. For graduate study she went on to the University of Chicago. She took a class with Enrico Fer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
East Orange, New Jersey
East Orange is a City (New Jersey), city in Essex County, New Jersey, Essex County, in the U.S. state of New Jersey. As of the 2020 United States census, 2020 U.S. census, the city's population was 69,612. The city was List of municipalities in New Jersey, the state's 20th most-populous municipality in 2010, after having been the state's 14th most-populous municipality in 2000.The Counties and Most Populous Cities and Townships in 2010 in New Jersey: 2000 and 2010 New Jersey Department of Labor and Workforce Development. Accessed November 3, 2019. The United States Census Bureau, Census Bureau's Population Estimates Program calculated that the city's population was 68,903 in 2021, ranking the city the List of United St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ruth Howes
Ruth Hege Howes (born 1944) is an American nuclear physicist, expert on nuclear weapons, and historian of science, known for her books on women in physics. Education and career Howes has a doctorate in physics from Columbia University. She joined the faculty at Ball State University in 1976, and became George and Frances Ball Distinguished Professor of Physics and Astronomy there; she retired as professor emerita from Ball State in 2003, to become chair of physics at Marquette University. She has also served as an American Association for the Advancement of Science Congressional Fellow, as program director for undergraduate physics programs at the National Science Foundation, as president of the American Association of Physics Teachers for 2000–2001, and as chair of the American Physical Society Forum on Education. Books With Caroline Herzenberg Caroline Stuart Littlejohn Herzenberg (born March 25, 1932) is an American physicist. Biography Caroline Herzenberg was born Caro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freeport, Illinois
Freeport is the county seat and largest city of Stephenson County, Illinois, United States. The population was 23,973 at the 2020 census, and the mayor of Freeport is Jodi Miller, elected in 2017. Freeport is known for hosting the second Lincoln-Douglas debate of 1858, and as "Pretzel City, USA", due to a popular local German bakery known for its pretzels in the 1850s. Freeport High School's mascot is the Pretzel to honor its heritage. History The community was originally called Winneshiek. When it was incorporated, the new municipality took its name from the generosity of Tutty Baker, who was credited with running a "free port" on the Pecatonica River. The name "Winneshiek" was later adopted, and is preserved to this day, by the Freeport Community Theatre Group. In 1837, Stephenson County was formed and Freeport became its seat of government in 1838. Linked by a stagecoach with Chicago, the community grew rapidly. In 1840, a frame courthouse was erected and the first schoo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
McCarthyism
McCarthyism is the practice of making false or unfounded accusations of subversion and treason, especially when related to anarchism, communism and socialism, and especially when done in a public and attention-grabbing manner. The term originally referred to the controversial practices and policies of U.S. Senator Joseph McCarthy, and has its origins in the period in the United States known as the Red Scare#Second Red Scare, Second Red Scare, lasting from the late 1940s through the 1950s. It was characterized by heightened political repression and persecution of left-wing individuals, and a Fear mongering, campaign spreading fear of alleged communist and socialist influence on American institutions and of Soviet espionage in the United States, espionage by Soviet agents. After the mid-1950s, McCarthyism began to decline, mainly due to Joseph McCarthy's gradual loss of public popularity and credibility after several of his accusations were found to be false, and sustained opposi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dirk Jan Struik
Dirk Jan Struik (September 30, 1894 – October 21, 2000) was a Dutch-born American (since 1934) mathematician, historian of mathematics and Marxian theoretician who spent most of his life in the U.S. Life Dirk Jan Struik was born in 1894 in Rotterdam, Netherlands, as a teacher's son. He attended the Hogere Burgerschool nl (HBS) over there. It was in this school that he was first introduced to left-wing politics and socialism by one of his teachers, called Mister van Dam. In 1912 Struik entered the University of Leiden, where he showed great interest in mathematics and physics, influenced by the eminent professors Paul Ehrenfest and Hendrik Lorentz. In 1917 he worked as a high school mathematics teacher for a while, after which he worked as a research assistant for J.A. Schouten. It was during this period that he developed his doctoral dissertation, "The Application of Tensor Methods to Riemannian Manifolds." In 1922 Struik obtained his doctorate in mathematics fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NASA
The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeeding the National Advisory Committee for Aeronautics (NACA), to give the U.S. space development effort a distinctly civilian orientation, emphasizing peaceful applications in space science. NASA has since led most American space exploration, including Project Mercury, Project Gemini, the 1968-1972 Apollo Moon landing missions, the Skylab space station, and the Space Shuttle. NASA supports the International Space Station and oversees the development of the Orion spacecraft and the Space Launch System for the crewed lunar Artemis program, Commercial Crew spacecraft, and the planned Lunar Gateway space station. The agency is also responsible for the Launch Services Program, which provides oversight of launch operations and countdown management f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Moon
The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of Australia). The Moon is a planetary-mass object with a differentiated rocky body, making it a satellite planet under the geophysical definitions of the term and larger than all known dwarf planets of the Solar System. It lacks any significant atmosphere, hydrosphere, or magnetic field. Its surface gravity is about one-sixth of Earth's at , with Jupiter's moon Io being the only satellite in the Solar System known to have a higher surface gravity and density. The Moon orbits Earth at an average distance of , or about 30 times Earth's diameter. Its gravitational influence is the main driver of Earth's tides and very slowly lengthens Earth's day. The Moon's orbit around Earth has a sidereal period of 27.3 days. During each synodic period ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mössbauer Effect
The Mössbauer effect, or recoilless nuclear resonance fluorescence, is a physical phenomenon discovered by Rudolf Mössbauer in 1958. It involves the resonant and recoil-free emission and absorption of gamma radiation by atomic nuclei bound in a solid. Its main application is in Mössbauer spectroscopy. In the Mössbauer effect, a narrow resonance for nuclear gamma emission and absorption results from the momentum of recoil being delivered to a surrounding crystal lattice rather than to the emitting or absorbing nucleus alone. When this occurs, no gamma energy is lost to the kinetic energy of recoiling nuclei at either the emitting or absorbing end of a gamma transition: emission and absorption occur at the same energy, resulting in strong, resonant absorption. History The emission and absorption of X-rays by gases had been observed previously, and it was expected that a similar phenomenon would be found for gamma rays, which are created by nuclear transitions (as opposed to X-r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mössbauer Spectroscopy
Mössbauer spectroscopy is a spectroscopic technique based on the Mössbauer effect. This effect, discovered by Rudolf Mössbauer (sometimes written "Moessbauer", German: "Mößbauer") in 1958, consists of the nearly recoil-free emission and absorption of nuclear gamma rays in solids. The consequent nuclear spectroscopy method is exquisitely sensitive to small changes in the chemical environment of certain nuclei. Typically, three types of nuclear interactions may be observed: the isomer shift due to differences in nearby electron densities (also called the chemical shift in older literature), quadrupole splitting due to atomic-scale electric field gradients; and magnetic Zeeman splitting due to non-nuclear magnetic fields. Due to the high energy and extremely narrow line widths of nuclear gamma rays, Mössbauer spectroscopy is a highly sensitive technique in terms of energy (and hence frequency) resolution, capable of detecting changes of just a few parts in 1011. It is a me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boron
Boron is a chemical element with the symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the ''boron group'' it has three valence electrons for forming covalent bonds, resulting in many compounds such as boric acid, the mineral borax, sodium borate, and the ultra-hard crystals of boron carbide and boron nitride. Boron is synthesized entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, so it is a low-abundance element in the Solar System and in the Crust (geology), Earth's crust. It constitutes about 0.001 percent by weight of Earth's crust. It is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals. These are mined industrially as evaporites, such as borax and kernite. The largest known deposits are in Turkey, the largest producer of boron minerals. Elemental b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Beryllium
Beryllium is a chemical element with the symbol Be and atomic number 4. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. It is a divalent element that occurs naturally only in combination with other elements to form minerals. Notable gemstones high in beryllium include beryl ( aquamarine, emerald) and chrysoberyl. It is a relatively rare element in the universe, usually occurring as a product of the spallation of larger atomic nuclei that have collided with cosmic rays. Within the cores of stars, beryllium is depleted as it is fused into heavier elements. Beryllium constitutes about 0.0004 percent by mass of Earth's crust. The world's annual beryllium production of 220 tons is usually manufactured by extraction from the mineral beryl, a difficult process because beryllium bonds strongly to oxygen. In structural applications, the combination of high flexural rigidity, thermal stability, thermal conductivity and low density (1.85 times that of water) ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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