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Michael Mallary
Michael L. Mallary is an engineer, physicist, inventor, and author who is noted for his contributions in the areas of magnetic recording and data storage on hard disk drives (HDD). His work has concentrated on developing and optimizing magnetic components to maximize data storage density. In particular, he is responsible to inventing the 'trailing-shield' write head used universally in modern HDDs. Mallary is a Fellow of the Institute of Electrical and Electronics Engineers and recipient of the IEEE Magnetics Society Achievement Award. Background and education Michael (Mike) Mallary was raised in Berkeley, California. His mother was an advertizing executive and his father was the noted sculptor, Robert Mallary. He attended schools in Los Angeles, California and New York City. He attended Archbishop Stepinac High School where he built a Jacob's Ladder and a crude electron microscope as science projects. Mallary received the S.B. degree in physics from the Massachusetts Inst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Rochelle, New York
New Rochelle (; older french: La Nouvelle-Rochelle) is a city in Westchester County, New York, United States, in the southeastern portion of the state. In 2020, the city had a population of 79,726, making it the seventh-largest in the state of New York. Some residents refer to the city as '' New Ro'' or ''New Roc City''. History Etymology and early history The European settlement was started by refugee Huguenots (French Protestants) in 1688, who were fleeing religious persecution in France (such as '' Dragonnades'') after the king's revocation of the Edict of Nantes. Many of the settlers were artisans and craftsmen from the city of La Rochelle, France, thus influencing the choice of the name of "New Rochelle". 17th and 18th centuries Some 33 families established the community of ''La Nouvelle-Rochelle'' () in 1688. A monument containing the names of these settlers stands in Hudson Park, the original landing point of the Huguenots. Thirty-one years earlier, the Siwanoy In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Massachusetts Institute Of Technology
The Massachusetts Institute of Technology (MIT) is a private land-grant research university in Cambridge, Massachusetts. Established in 1861, MIT has played a key role in the development of modern technology and science, and is one of the most prestigious and highly ranked academic institutions in the world. Founded in response to the increasing industrialization of the United States, MIT adopted a European polytechnic university model and stressed laboratory instruction in applied science and engineering. MIT is one of three private land grant universities in the United States, the others being Cornell University and Tuskegee University. The institute has an urban campus that extends more than a mile (1.6 km) alongside the Charles River, and encompasses a number of major off-campus facilities such as the MIT Lincoln Laboratory, the Bates Center, and the Haystack Observatory, as well as affiliated laboratories such as the Broad and Whitehead Institutes. , 98 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disk Read-and-write Head
A disk read-and-write head is the small part of a disk drive which moves above the disk platter and transforms the platter's magnetic field into electrical current (reads the disk) or, vice versa, transforms electrical current into magnetic field (writes the disk). The heads have gone through a number of changes over the years. In a hard drive, the heads ''fly'' above the disk surface with clearance of as little as 3 nanometres. The flying height has been decreasing with each new generation of technology to enable higher areal density. The flying height of the head is controlled by the design of an air bearing etched onto the disk-facing surface of the ''slider''. The role of the air bearing is to maintain the flying height constant as the head moves over the surface of the disk. The air bearings are carefully designed to maintain the same height across the entire platter, despite differing speeds depending on the head distance from the center of the platter. If the head h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RA90
The RA90 disk drive was the first Digital Equipment Corporation drive to be based on "thin film" technology. Prior to the RA90 all Digital disk drives used "oxide" disks, which were an aluminum disk coated with a polyurethane binder resin containing gamma ferric oxide particles as the recording medium. The 1988-released RA90, which held 1.2GB, was used with controllers implementing the Mass Storage Control Protocol. Overview The RA90 disk drive, in addition to being DEC's first step into ''thin film'' technology, also introduced another first for ''DEC''": ''Storage Arrays''. Their first was the ''SA600 Storage Array'', which had 4 or 8 drives. Other models were the SA550 and SA650 ''Mixed Storage Array''s, combining RA70s with RA82s (SA550) or RA90s (SA650). The SA482 used just RA82s instead of RA90s. Replacing the 1.2GB RA90s with 1.5GB RA92s, an ''SA800 Storage Array'' held 12GB. History The technology was pioneered by Ampex Corporation in Redwood City, California based on a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shrewsbury, Massachusetts
Shrewsbury (/ˈʃruzberi/ ''SHROOZ-bury'') is a town in Worcester County, Massachusetts, United States. Shrewsbury, unlike the surrounding towns of Grafton, Millbury, Westborough, Northborough, Boylston, and West Boylston did not become a mill town or farming village; most of its 19th-century growth was due to its proximity to Worcester and visitors to Lake Quinsigamond. The population was 38,325 according to the 2020 United States Census, in nearly 15,000 households. Incorporated in 1727, the town is governed now under the New England representative town meeting system, headed by the Town Manager and five-member elected Board of Selectmen whose duties include licensing, appointing various administrative positions, and calling a town meeting of citizens annually or whenever the need arises. History The Town of Shrewsbury, named for Shrewsbury, England, is a suburban community with an uneven and hilly terrain cut by a number of minor streams providing several small water ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trailing Shield Write Head
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Trailing can mean, among others: * Facing and trailing, in railroads * The act f using a Trailer (promotion) * Trailing wheel * Trailing arm * Trailing edge * Hound trailing * Trailing twelve months Trailing twelve months (TTM) is a measurement of a company's financial performance (income and expenses) used in finance. It is measured by using the income statements from a company's reports (such as interim, quarterly or annual reports), to calc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnetic Separation
Magnetic separation is the process of separating components of mixtures by using a magnet to attract magnetic substances. The process that is used for magnetic separation separates non-magnetic substances from those which are magnetic. This technique is useful for the select few minerals which are ferromagnetic (iron-, nickel-, and cobalt-containing minerals) and paramagnetic. Most metals, including gold, silver and aluminum, are nonmagnetic. A large diversity of mechanical means are used to separate magnetic materials. During magnetic separation, magnets are situated inside two separator drums which bear liquids. Due to the magnets, magnetic particles are being drifted by the movement of the drums. This can create a magnetic concentrate (e.g. an ore concentrate). History Michael Faraday discovered that when a substance is put in a magnetic environment, the intensity of the environment is modified by it. With this information, he discovered that different materials can be separa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuclear Fusion
Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles ( neutrons or protons). The difference in mass between the reactants and products is manifested as either the release or absorption of energy. This difference in mass arises due to the difference in nuclear binding energy between the atomic nuclei before and after the reaction. Nuclear fusion is the process that powers active or main-sequence stars and other high-magnitude stars, where large amounts of energy are released. A nuclear fusion process that produces atomic nuclei lighter than iron-56 or nickel-62 will generally release energy. These elements have a relatively small mass and a relatively large binding energy per nucleon. Fusion of nuclei lighter than these releases energy (an exothermic process), while the fusion of heavier nuclei results in energy retained by the product nucleons, and the resulting reaction is endo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superconducting Magnets
A superconducting magnet is an electromagnet made from coils of superconducting wire. They must be cooled to cryogenic temperatures during operation. In its superconducting state the wire has no electrical resistance and therefore can conduct much larger electric currents than ordinary wire, creating intense magnetic fields. Superconducting magnets can produce stronger magnetic fields than all but the strongest non-superconducting electromagnets, and large superconducting magnets can be cheaper to operate because no energy is dissipated as heat in the windings. They are used in MRI instruments in hospitals, and in scientific equipment such as NMR spectrometers, mass spectrometers, fusion reactors and particle accelerators. They are also used for levitation, guidance and propulsion in a magnetic levitation (maglev) railway system being constructed in Japan. Construction Cooling During operation, the magnet windings must be cooled below their critical temperature, the temperature a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waltham, Massachusetts
Waltham ( ) is a city in Middlesex County, Massachusetts, United States, and was an early center for the labor movement as well as a major contributor to the American Industrial Revolution. The original home of the Boston Manufacturing Company, the city was a prototype for 19th century industrial city planning, spawning what became known as the Waltham-Lowell system of labor and production. The city is now a center for research and higher education, home to Brandeis University and Bentley University as well as industrial powerhouse Raytheon Technologies. The population was 65,218 at the census in 2020. Waltham has been called "watch city" because of its association with the watch industry. Waltham Watch Company opened its factory in Waltham in 1854 and was the first company to make watches on an assembly line. It won the gold medal in 1876 at the Philadelphia Centennial Exposition. The company produced over 35 million watches, clocks and instruments before it closed in 1957. Histo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rutherford Laboratory
The Rutherford Appleton Laboratory (RAL) is one of the national scientific research laboratories in the UK operated by the Science and Technology Facilities Council (STFC). It began as the Rutherford High Energy Laboratory, merged with the Atlas Computer Laboratory in 1975 to create the Rutherford Lab; then in 1979 with the Appleton Laboratory to form the current laboratory. It is located on the Harwell Science and Innovation Campus at Chilton, Oxfordshire, Chilton near Didcot in Oxfordshire, United Kingdom. It has a staff of approximately 1,200 people who support the work of over 10,000 scientists and engineers, chiefly from the university research community. The laboratory's programme is designed to deliver trained manpower and economic growth for the UK as the result of achievements in science. History RAL is named after the physicists Ernest Rutherford and Edward Victor Appleton, Edward Appleton. The National Institute for Research in Nuclear Science (NIRNS) was formed in 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frank J
Frank or Franks may refer to: People * Frank (given name) * Frank (surname) * Franks (surname) * Franks, a medieval Germanic people * Frank, a term in the Muslim world for all western Europeans, particularly during the Crusades - see Farang Currency * Liechtenstein franc or frank, the currency of Liechtenstein since 1920 * Swiss franc or frank, the currency of Switzerland since 1850 * Westphalian frank, currency of the Kingdom of Westphalia between 1808 and 1813 * The currencies of the German-speaking cantons of Switzerland (1803–1814): ** Appenzell frank ** Argovia frank ** Basel frank ** Berne frank ** Fribourg frank ** Glarus frank ** Graubünden frank ** Luzern frank ** Schaffhausen frank ** Schwyz frank ** Solothurn frank ** St. Gallen frank ** Thurgau frank ** Unterwalden frank ** Uri frank ** Zürich frank Places * Frank, Alberta, Canada, an urban community, formerly a village * Franks, Illinois, United States, an unincorporated community * Franks, Missouri, United ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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