Summary

HandWiki is the world's largest wiki-style encyclopedia dedicated to science, technology and computing. It allows you to create and edit articles as long as you have external citations and login account. In addition, this is a content management environment that can be used for collaborative editing of original scholarly content, such as books, manuals, monographs and tutorials.

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Neutral Beam Injection
Neutral beam injection (NBI) is one method used to heat plasma inside a fusion device consisting in a beam of high-energy neutral particles that can enter the magnetic confinement field. When these neutral particles are ionized by collision with the plasma particles, they are kept in the plasma by the confining magnetic field, and can transfer most of their energy by further collisions with the plasma. By tangential injection in the torus, neutral beams also provide momentum to the plasma and current drive, one essential feature for long pulses of burning plasmas. Neutral beam injection is a flexible and reliable technique, which has been the main heating system on a large variety of fusion devices. To date, all NBI systems were based on positive precursor ion beams. In the 90s there has been impressive progress in negative ion sources and accelerators with the construction of multi-megawatt negative ion based NBI systems at LHD (H0, 180 keV) and JT-60U (D0, 500 keV). The NBI designed for ITER is a substantial challenge (D0, 1MeV, 40A) and a prototype is being constructed to optimize its performance in view of the ITER future operations. Other ways to heat plasma for nuclear fusion include RF heating, electron cyclotron resonance heating (ECRH), and ion cyclotron resonance heating (ICRH), Lower hybrid resonance heating (LH).
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  • 15 Nov 2022
Topic Review
Evolution of Hawaiian Volcanoes
The fifteen volcanoes that make up the eight principal islands of Hawaii are the youngest in a chain of more than 129 volcanoes that stretch 5,800 kilometres (3,600 mi) across the North Pacific Ocean, called the Hawaiian–Emperor seamount chain. Hawaiʻi's volcanoes rise an average of 4,572 metres (15,000 ft) to reach sea level from their base. The largest, Mauna Loa, is 4,169 metres (13,678 ft) high. As shield volcanoes, they are built by accumulated lava flows, growing a few meters or feet at a time to form a broad and gently sloping shape. Hawaiian islands undergo a systematic pattern of submarine and subaerial growth that is followed by erosion. An island's stage of development reflects its distance from the Hawaii hotspot.
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  • 15 Nov 2022
Topic Review
Vaccine Injury
A vaccine injury is an injury caused by vaccination. Allegations and confirmed instances of vaccine injuries in recent decades have appeared in litigation in the United States. Some families have won substantial awards from sympathetic juries,[weasel words] even though many public health officials have said that the claims of injuries are unfounded. In response, several vaccine makers stopped production, threatening public health, and laws were passed to shield makers from liabilities stemming from vaccine injury claims.
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  • 15 Nov 2022
Topic Review
Canadian Arctic Archipelago
The Canadian Arctic Archipelago, also known as the Arctic Archipelago, is a group of islands north of the Canada mainland. Situated in the northern extremity of North America and covering about 1,424,500 km2 (550,000 sq mi), this group of 36,563 islands in the Arctic Sea comprises much of the territory of Northern Canada – most of Nunavut and part of the Northwest Territories. The Canadian Arctic Archipelago is showing some effects of global warming, with some computer estimates determining that melting there will contribute 3.5 cm (1.4 in) to the rise in sea levels by 2100.
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  • 15 Nov 2022
Topic Review
Medical Restraint
Medical restraints are physical restraints used during certain medical procedures to restrain patients with the minimum of discomfort and pain and to prevent them from injuring themselves or others.
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  • 15 Nov 2022
Topic Review
MIDI 1.0
The Musical Instrument Digital Interface (MIDI) specification version 1.0 describes the communications protocol and the message format, as well electrical connector. MIDI 1.0 is a one-way connection from the MIDI Out connector of the sending device to the MIDI In connector of the receiving device, transmitted serially at a rate of 31.25 kbit/s.
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  • 15 Nov 2022
Topic Review
Latin Letters Used in Mathematics
Many letters of the Latin alphabet, both capital and small, are used in mathematics, science, and engineering to denote by convention specific or abstracted constants, variables of a certain type, units, multipliers, or physical entities. Certain letters, when combined with special formatting, take on special meaning. Below is an alphabetical list of the letters of the alphabet with some of their uses. The field in which the convention applies is mathematics unless otherwise noted.
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  • 15 Nov 2022
Topic Review
Scopes Trial
The Scopes Trial, formally known as The State of Tennessee v. John Thomas Scopes and commonly referred to as the Scopes Monkey Trial, was an American legal case in July 1925 in which a substitute high school teacher, John T. Scopes, was accused of violating Tennessee 's Butler Act, which had made it unlawful to teach human evolution in any state-funded school. The trial was deliberately staged in order to attract publicity to the small town of Dayton, Tennessee, where it was held. Scopes was unsure whether he had ever actually taught evolution, but he purposely incriminated himself so that the case could have a defendant. Scopes was found guilty and fined $100 (equivalent to $1458 in 2019), but the verdict was overturned on a technicality. The trial served its purpose of drawing intense national publicity, as national reporters flocked to Dayton to cover the big-name lawyers who had agreed to represent each side. William Jennings Bryan, three-time presidential candidate, argued for the prosecution, while Clarence Darrow, the famed defense attorney, spoke for Scopes. The trial publicized the Fundamentalist–Modernist Controversy, which set Modernists, who said evolution was not inconsistent with religion, against Fundamentalists, who said the word of God as revealed in the Bible took priority over all human knowledge. The case was thus seen as both a theological contest and a trial on whether "modern science" should be taught in schools.
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  • 15 Nov 2022
Topic Review
Vat Purnima
Vat Purnima or pournima chavan or Wat Purnima (वट पूर्णिमा, vaṭapūrṇimā, also called Vat Savitri is a celebration observed by married women in the Western Indian states of Gujarat, Maharashtra, Goa and some regions of eastern Uttar Pradesh. On this Purnima or "full moon" during the three days of the month of Jyeshtha in the Hindu calendar (which falls in May-June in the Gregorian calendar) a married woman marks her love for her husband by tying a ceremonial thread around a banyan tree. The celebration is based on the legend of Savitri and Satyavan as narrated in the epic Mahabharata.
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  • 15 Nov 2022
Topic Review
List of Edmund Rice (Colonist) Descendants
This is a category of descendants of Edmund Rice who immigrated to Massachusetts Bay Colony in 1638 with his kin and became a founder of both Sudbury, Massachusetts and Marlborough, Massachusetts.
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