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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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Partridge 1885
Partridge is documented as being the world's oldest, still fully operational classic racing yacht.
  • 1.8K
  • 02 Dec 2022
Topic Review
Cylinder (Engine)
A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work. Cylinders may be sleeved (lined with a harder metal) or sleeveless (with a wear-resistant coating such as Nikasil). A sleeveless engine may also be referred to as a "parent-bore engine". A cylinder's displacement, or swept volume, can be calculated by multiplying its cross-sectional area (the square of half the bore by pi) by the distance the piston travels within the cylinder (the stroke). The engine displacement can be calculated by multiplying the swept volume of one cylinder by the number of cylinders. Presented symbolically, A piston is seated inside each cylinder by several metal piston rings fitted around its outside surface in machined grooves; typically two for compressional sealing and one to seal the oil. The rings make near contact with the cylinder walls (sleeved or sleeveless), riding on a thin layer of lubricating oil; essential to keep the engine from seizing and necessitating a cylinder wall's durable surface. During the earliest stage of an engine's life, its initial breaking-in or running-in period, small irregularities in the metals are encouraged to gradually form congruent grooves by avoiding extreme operating conditions. Later in its life, after mechanical wear has increased the spacing between the piston and the cylinder (with a consequent decrease in power output) the cylinders may be machined to a slightly larger diameter to receive new sleeves (where applicable) and piston rings, a process sometimes known as reboring.
  • 1.7K
  • 06 Dec 2022
Topic Review
Prescription Costs
Prescription costs are a common health care cost for many people and also the source of economic hardship for some.
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  • 02 Dec 2022
Topic Review
Transit
File:Moon transit of sun large.ogv In astronomy, a transit (or astronomical transit) is a phenomenon when a celestial body passes directly between a larger body and the observer. As viewed from a particular vantage point, the transiting body appears to move across the face of the larger body, covering a small portion of it. The word "transit" refers to cases where the nearer object appears smaller than the more distant object. Cases where the nearer object appears larger and completely hides the more distant object are known as occultations. However, the probability of seeing a transiting planet is low because it is dependent on the alignment of the three objects in a nearly perfectly straight line. Many parameters of a planet and its parent star can be determined based on the transit.
  • 2.7K
  • 02 Dec 2022
Topic Review
Flybuys (Australia)
flybuys is an Australia n loyalty program owned and operated by Coles, with the main participating retail outlets being Coles Supermarkets, Coles Express, Kmart, Liquorland, First Choice Liquor and Target stores. It is one of Australia's largest loyalty programs, with over 10 million flybuys cardholders in over 5.5 million Australian households. Members earn points from household consumer purchases (and through credit card use) and subsequently exchange points for gift cards, merchandise, flights and other rewards.
  • 3.9K
  • 02 Dec 2022
Topic Review
Shared Residency in England
Shared residence, joint residence, or shared parenting refers to the situation where a child of parents who have divorced or separated live with each parent at different times, such as every other week. With shared residency, both parents have parental responsibility. Shared residency does not mean that the time the child spends with each parent must be equal.
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  • 02 Dec 2022
Topic Review
Social Presence Theory
Social presence theory explores how the "sense of being with another" is influenced by digital interfaces in human-computer interactions. Developed from the foundations of interpersonal communication and symbolic interactionism, social presence theory was first formally introduced by John Short, Ederyn Williams, and Bruce Christie in The Social Psychology of Telecommunications. Research on social presence theory has recently developed to examine the efficacy of telecommunications media, including SNS communications. The theory notes that computer-based communication is lower in social presence than face-to-face communication, but different computer-based communications can affect the levels of social presence between communicators and receivers.
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  • 02 Dec 2022
Topic Review
Rho(D) Immune Globulin
Rho(D) immune globulin (RhIG) is a medication used to prevent RhD isoimmunization in mothers who are RhD negative and to treat idiopathic thrombocytopenic purpura (ITP) in people who are Rh positive. It is often given both during and following pregnancy. It may also be used when RhD-negative people are given RhD-positive blood. It is given by injection into muscle or a vein. A single dose lasts 12 weeks. Common side effects include fever, headache, pain at the site of injection, and red blood cell breakdown. Other side effects include allergic reactions, kidney problems, and a very small risk of viral infections. In those with ITP, the amount of red blood cell breakdown may be significant. Use is safe with breastfeeding. Rho(D) immune globulin is made up of antibodies to the antigen Rho(D) present on some red blood cells. It is believed to work by blocking a person's immune system from recognizing this antigen. Rho(D) immune globulin came into medical use in the 1960s. It is on the World Health Organization's List of Essential Medicines. It is made from human blood plasma.
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  • 02 Dec 2022
Topic Review
North–South Divide
The North–South divide is a socio-economic and political division of Earth popularized in the late 20th century and early 21st century. Generally, definitions of the Global North include the United States , Canada , almost all the European countries, Israel, Cyprus, Japan , Singapore, South Korea , Australia , and New Zealand. The Global South is made up of Sub-Saharan Africa, Latin America and the Caribbean, Pacific Islands, and the developing countries in Asia, including the Middle East. It is home to the BRIC countries (excluding Russia ): Brazil , India and China , which, along with Indonesia and Mexico, are the largest Southern states in terms of land area and population. The North is mostly correlated with the Western world and the First World, plus much of the Second World, while the South largely corresponds with the Third World and Eastern world. The two groups are often defined in terms of their differing levels of wealth, economic development, income inequality, democracy, and political and economic freedom, as defined by freedom indices. Nations in the North tend to be wealthier, less unequal and considered more democratic and to be developed countries who export technologically advanced manufactured products; Southern states are generally poorer developing countries with younger, more fragile democracies heavily dependent on primary sector exports and frequently share a history of past colonialism by Northern states. Nevertheless, the divide between the North and the South is often challenged and said to be increasingly incompatible with reality. In economic terms, as of the early 21st century, the North—with one quarter of the world population—controls four-fifths of the income earned anywhere in the world. 90% of the manufacturing industries are owned by and located in the North. Inversely, the South—with three quarters of the world population—has access to one-fifth of the world income. As nations become economically developed, they may become part of definitions the "North", regardless of geographical location; similarly, any nations that do not qualify for "developed" status are in effect deemed to be part of the "South".
  • 9.3K
  • 02 Dec 2022
Topic Review
Bird Technologies
Bird provides radio frequency communication products, services, calibration and training for the public security, cellular networks, broadcasting, semiconductor, military, government and medical industries. Bird's product portfolio includes spectrum analyzers, antenna and cable testers, power sensors, power meters and monitors, wattmeters, attenuators, terminations and loads, cellular repeaters, signal boosters, distributed antenna systems (DAS), RF streaming solutions, RF signal generation, and RF software analysis tools. The company's core market segments are Coverage Enhancement, Off Air Testing, M2M Sensors and Test & Measurement. Bird sells its products online, as well as through a network of distributors and sales representatives worldwide.
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  • 02 Dec 2022
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