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David Gerdes
David Gerdes (born 1964) is an American astrophysicist, professor, and administrator at the University of Michigan. He is known for his research on trans-Neptunian objects, particularly for his discovery of the dwarf planet, . Education Gerdes completed his undergraduate education in physics at Carleton College in Northfield, Minnesota in 1986. From 1986 to 1987, he studied applied mathematics and theoretical physics at the University of Cambridge under a Churchill Scholarship. From 1987 to 1992, he studied at the University of Chicago, eventually obtaining a PhD in physics. Career Upon completing his Ph.D., Gerdes joined the University of Michigan Physics Department in 1992 as a postdoctoral research fellow, working on the Collider Detector at Fermilab (CDF) experiment. From 1996 to 1998, he was an assistant professor of Physics and Astronomy at Johns Hopkins University. He returned to the University of Michigan Physics Department as a faculty member in 1998, and was promo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Worcester, Massachusetts
Worcester ( , ) is a city and county seat of Worcester County, Massachusetts, United States. Named after Worcester, England, the city's population was 206,518 at the 2020 United States census, 2020 census, making it the second-List of cities in New England by population, most populous city in New England after Boston. Worcester is approximately west of Boston, east of Springfield, Massachusetts, Springfield and north-northwest of Providence, Rhode Island, Providence. Due to its location near the geographic center of Massachusetts, Worcester is known as the "Heart of the Commonwealth"; a heart is the official symbol of the city. Worcester developed as an industrial city in the 19th century due to the Blackstone Canal and rail transport, producing machinery, textiles and wire. Large numbers of European immigrants made up the city's growing population. However, the city's manufacturing base waned following World War II. Long-term economic and population decline was not reversed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collider Detector At Fermilab
The Collider Detector at Fermilab (CDF) experimental collaboration studies high energy particle collisions from the Tevatron, the world's former highest-energy particle accelerator. The goal is to discover the identity and properties of the particles that make up the universe and to understand the forces and interactions between those particles. CDF is an international collaboration that, at its peak, consisted of about 600 physicists (from about 30 American universities and National laboratories and about 30 groups from universities and national laboratories from Italy, Japan, UK, Canada, Germany, Spain, Russia, Finland, France, Taiwan, Korea, and Switzerland). The CDF detector itself weighed about 5000 tons and was about 12 meters in all three dimensions. The goal of the experiment is to measure exceptional event (particle physics), events out of the billions of particle Beam crossing, collisions in order to: * Look for evidence for phenomena beyond the Standard Model of particl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Michigan Daily
''The Michigan Daily'' is the weekly student newspaper of the University of Michigan. Its first edition was published on September 29, 1890. The newspaper is financially and editorially independent of the University's administration and other student groups, but shares a university building with other student publications on 420 Maynard Street, north of the Michigan Union and Huetwell Student Activities Center. In 2007, renovations to the historic building at 420 Maynard were completed, funded entirely by private donations from alumni. To dedicate the renovated building, a reunion of the staffs of ''The Michigan Daily'', the ''Michiganensian'' yearbook, and the ''Gargoyle'' ''Humor Magazine'' was held on October 26–28, 2007. ''The Michigan Daily'' is published weekly in broadsheet form during the Fall and Winter semesters and in tabloid form from May to August. Broadsheets contain a lengthy ''SportsWednesday'' Sports section and occasionally an extended, themed issue called ''T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Detroit Free Press
The ''Detroit Free Press'' is the largest daily newspaper in Detroit, Michigan, US. The Sunday edition is titled the ''Sunday Free Press''. It is sometimes referred to as the Freep (reflected in the paper's web address, www.freep.com). It primarily serves Wayne, Oakland, Macomb, Livingston, Washtenaw, and Monroe counties. The ''Free Press'' is also the largest city newspaper owned by Gannett, which also publishes ''USA Today''. The ''Free Press'' has received ten Pulitzer Prizes and four Emmy Awards. Its motto is "On Guard for Years". In 2018, the ''Detroit Free Press'' received two Salute to Excellence awards from the National Association of Black Journalists. History 1831–1989: Competitive newspaper The newspaper was launched by John R. Williams and his uncle, Joseph Campau, and was first published as the ''Democratic Free Press and Michigan Intelligencer'' on May 5, 1831. It was renamed to ''Detroit Daily Free Press'' in 1835, becoming the region's first daily newsp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
B-tagging
b-tagging is a method of jet flavor tagging used in modern particle physics experiments. It is the identification (or "tagging") of jets originating from bottom quarks (or b quarks, hence the name). Importance b-tagging is important because: * The physics of bottom quarks is quite interesting; in particular, it sheds light on CP violation. * Some important high-mass particles (both recently discovered and hypothetical) decay into bottom quarks. Top quarks very nearly always do so, and the Higgs boson is expected to decay into bottom quarks more than any other particle given its mass has been observed to be about 125 GeV. Identifying bottom quarks helps to identify the decays of these particles. Methods The methods for b-tagging are based on the unique features of b-jets. These include: *Hadrons containing bottom quarks have sufficient lifetime that they travel some distance before decaying. On the other hand, their lifetimes are not so high as those of light quark hadr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Particle Physics
Particle physics or high energy physics is the study of fundamental particles and forces that constitute matter and radiation. The fundamental particles in the universe are classified in the Standard Model as fermions (matter particles) and bosons (force-carrying particles). There are three generations of fermions, but ordinary matter is made only from the first fermion generation. The first generation consists of up and down quarks which form protons and neutrons, and electrons and electron neutrinos. The three fundamental interactions known to be mediated by bosons are electromagnetism, the weak interaction, and the strong interaction. Quarks cannot exist on their own but form hadrons. Hadrons that contain an odd number of quarks are called baryons and those that contain an even number are called mesons. Two baryons, the proton and the neutron, make up most of the mass of ordinary matter. Mesons are unstable and the longest-lived last for only a few hundredths of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Physical Society
The American Physical Society (APS) is a not-for-profit membership organization of professionals in physics and related disciplines, comprising nearly fifty divisions, sections, and other units. Its mission is the advancement and diffusion of knowledge of physics. The society publishes more than a dozen scientific journals, including the prestigious '' Physical Review'' and ''Physical Review Letters'', and organizes more than twenty science meetings each year. APS is a member society of the American Institute of Physics. Since January 2021 the organization has been led by chief executive officer Jonathan Bagger. History The American Physical Society was founded on May 20, 1899, when thirty-six physicists gathered at Columbia University for that purpose. They proclaimed the mission of the new Society to be "to advance and diffuse the knowledge of physics", and in one way or another the APS has been at that task ever since. In the early years, virtually the sole activity of the AP ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planet Nine
Planet Nine is a hypothetical planet in the outer region of the Solar System. Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth. These ETNOs tend to make their closest approaches to the Sun in one sector, and their orbits are similarly tilted. These alignments suggest that an undiscovered planet may be shepherding the orbits of the most distant known Solar System objects. Nonetheless, some astronomers question this conclusion and instead assert that the clustering of the ETNOs orbits is due to observational biases, resulting from the difficulty of discovering and tracking these objects during much of the year. Based on earlier considerations, this hypothetical super-Earth-sized planet would have had a predicted mass of five to ten times that of the Earth, and an elongated orbit 400 to 800 times as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kuiper Belt
The Kuiper belt () is a circumstellar disc in the outer Solar System, extending from the orbit of Neptune at 30 astronomical units (AU) to approximately 50 AU from the Sun. It is similar to the asteroid belt, but is far larger—20 times as wide and 20–200 times as massive. Like the asteroid belt, it consists mainly of small bodies or remnants from when the Solar System formed. While many asteroids are composed primarily of rock and metal, most Kuiper belt objects are composed largely of frozen volatiles (termed "ices"), such as methane, ammonia, and water. The Kuiper belt is home to most of the objects that astronomers generally accept as dwarf planets: Orcus, Pluto, Haumea, Quaoar, and Makemake. Some of the Solar System's moons, such as Neptune's Triton and Saturn's Phoebe, may have originated in the region. The Kuiper belt was named after Dutch astronomer Gerard Kuiper, although he did not predict its existence. In 1992, minor planet (15760) Albion was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dark Energy Survey
The Dark Energy Survey (DES) is an astronomical survey designed to constrain the properties of dark energy. It uses images taken in the near-ultraviolet, Visible spectrum, visible, and near-infrared to measure the expansion of the universe using Type Ia supernovae, baryon acoustic oscillations, the number of Galaxy groups and clusters, galaxy clusters, and weak gravitational lensing. The collaboration is composed of research institutions and universities from the United States,DES Collaboration Page DES Collaborators. Australia, Brazil,DES-Brazil , DES-Brazil Consortium. the United Kingdom, Germany, Spain, and Switzerland. The collaboration is divided into several scientific working groups. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Science Foundation
The National Science Foundation (NSF) is an independent agency of the United States government that supports fundamental research and education in all the non-medical fields of science and engineering. Its medical counterpart is the National Institutes of Health. With an annual budget of about $8.3 billion (fiscal year 2020), the NSF funds approximately 25% of all federally supported basic research conducted by the United States' colleges and universities. In some fields, such as mathematics, computer science, economics, and the social sciences, the NSF is the major source of federal backing. The NSF's director and deputy director are appointed by the President of the United States and confirmed by the United States Senate, whereas the 24 president-appointed members of the National Science Board (NSB) do not require Senate confirmation. The director and deputy director are responsible for administration, planning, budgeting and day-to-day operations of the foundation, while t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Department Of Energy
The United States Department of Energy (DOE) is an executive department of the U.S. federal government that oversees U.S. national energy policy and manages the research and development of nuclear power and nuclear weapons in the United States. The DOE oversees the U.S. nuclear weapons program, nuclear reactor production for the United States Navy, energy-related research, and domestic energy production and energy conservation. The DOE was created in 1977 in the aftermath of the 1973 oil crisis. It sponsors more physical science research than any other U.S. federal agency, the majority of which is conducted through its system of National Laboratories. The DOE also directs research in genomics, with the Human Genome Project originating from a DOE initiative. The department is headed by the Secretary of Energy, who reports directly to the president of the United States and is a member of the Cabinet. The current Secretary of Energy is Jennifer Granholm, who has served ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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