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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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Tesla Turbine
The Tesla turbine is a bladeless centripetal flow turbine patented by Nikola Tesla in 1913. It is referred to as a bladeless turbine. The Tesla turbine is also known as the boundary-layer turbine, cohesion-type turbine, and Prandtl-layer turbine (after Ludwig Prandtl) because it uses the boundary-layer effect and not a fluid impinging upon the blades as in a conventional turbine. Bioengineering researchers have referred to it as a multiple-disk centrifugal pump. One of Tesla's desires for implementation of this turbine was for geothermal power, which was described in Our Future Motive Power.
  • 1.5K
  • 10 Oct 2022
Topic Review
Mersenne Conjectures
In mathematics, the Mersenne conjectures concern the characterization of prime numbers of a form called Mersenne primes, meaning prime numbers that are a power of two minus one.
  • 1.2K
  • 10 Oct 2022
Topic Review
Flashline Mars Arctic Research Station
The Flashline Mars Arctic Research Station (FMARS) is the first of two simulated Mars habitats (or Mars Analog Research Stations) established and maintained by the Mars Society.
  • 3.0K
  • 10 Oct 2022
Topic Review
Radio Direction Finder
A radio direction finder (RDF) is a device for finding the direction, or bearing, to a radio source. The act of measuring the direction is known as radio direction finding or sometimes simply direction finding (DF). Using two or more measurements from different locations, the location of an unknown transmitter can be determined; alternately, using two or more measurements of known transmitters, the location of a vehicle can be determined. RDF is widely used as a radio navigation system, especially with boats and aircraft. RDF systems can be used with any radio source, although the size of the receiver antennas are a function of the wavelength of the signal; very long wavelengths (low frequencies) require very large antennas, and are generally used only on ground-based systems. These wavelengths are nevertheless very useful for marine navigation as they can travel very long distances and "over the horizon", which is valuable for ships when the line-of-sight may be only a few tens of kilometres. For aircraft, where the horizon at altitude may extend to hundreds of kilometres, higher frequencies can be used, allowing much smaller antennas. An automatic direction finder, often capable of being tuned to commercial AM radio transmitters, is a feature of almost all modern aircraft. For the military, RDF systems are a key component of signals intelligence systems and methodologies. The ability to locate the position of an enemy transmitter has been invaluable since World War I, and it played a key role in World War II's Battle of the Atlantic. It is estimated that the UK's advanced "huff-duff" systems were directly or indirectly responsible for 24% of all U-boats sunk during the war. Modern systems often use phased array antennas to allow rapid beam forming for highly accurate results. These are generally integrated into a wider electronic warfare suite. Several distinct generations of RDF systems have been used over time, following new developments in electronics. Early systems used mechanically rotated antennas that compared signal strengths from different directions, and several electronic versions of the same concept followed. Modern systems use the comparison of phase or doppler techniques which are generally simpler to automate. Modern pseudo-Doppler direction finder systems consist of a number of small antennas fixed to a circular card, with all of the processing performed by software. Early British radar sets were also referred to as RDF, which was a deception tactic. However, the terminology was not inaccurate; the Chain Home systems used separate omnidirectional broadcasters and large RDF receivers to determine the location of the targets.
  • 4.0K
  • 10 Oct 2022
Topic Review
Level of Service
Level of service (LOS) is a qualitative measure used to relate the quality of motor vehicle traffic service. LOS is used to analyze roadways and intersections by categorizing traffic flow and assigning quality levels of traffic based on performance measure like vehicle speed, density, congestion, etc.
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  • 12 Oct 2022
Topic Review
Moral Disengagement
Moral disengagement is a term from social psychology for the process of convincing the self that ethical standards do not apply to oneself in a particular context. This is done by separating moral reactions from inhumane conduct and disabling the mechanism of self-condemnation. Thus, moral disengagement involves a process of cognitive re-construing or re-framing of destructive behavior as being morally acceptable without changing the behavior or the moral standards. In social cognitive theory of morality, self-regulatory mechanisms embedded in moral standards and self-sanctions translate moral reasoning into actions, and, as a result, moral agency is exerted. Thus, the moral self is situated in a broader, socio-cognitive self-theory consisting of self-organizing, proactive, self-reflective, and self-regulative mechanisms. Three major sub-functions are operating in this self-regulatory system in which moral agency is grounded. The first sub-function is self-monitoring of one's conduct, which is the initial step of taking control over it. "Action gives rise to self-reactions through a judgmental function in which conduct is evaluated against internal standards and situational circumstances". Thus, moral judgments evoke self-reactive influence. The self-reactive and judgmental mechanisms constitute the second and third sub-function. Generally, moral standards are adopted to serve as guides for good behavior and as deterrents for bad conduct. Once internalized control has developed, people regulate their actions by the standards they apply to themselves and this give them self-satisfaction and a sense of self-worth. Individuals refrain from behaving in ways that violate their moral standards in order to avoid self-condemnation. Therefore, self-sanctions play a significant role in keeping conduct in line with these internal moral standards and hence also in regulating inhumane conduct. However, moral standards only function as fixed internal regulators of conduct when self-regulatory mechanisms have been activated. Many different social and psychological processes prevent the activation of self-sanction. Selective activation of self-sanctions and internal moral control or disengagement allows for a wide range of behaviour, given the same moral standard. Moral disengagement functions in the perpetration of inhumanities through moral justification, euphemistic labelling, advantageous comparison, displacing or diffusing responsibility, disregarding or misrepresenting injurious consequences, and dehumanising the victim. Rather than operating independently, these cognitive mechanisms are interrelated within a sociostructural context to promote inhumane conduct in people's daily lives.
  • 10.4K
  • 10 Oct 2022
Topic Review
Biometal
Biometals are metals normally present, in small but important and measurable amounts, in biology, biochemistry, and medicine. The metals copper, zinc, iron, and manganese are examples of metals that are essential for the normal functioning of most plants and the bodies of most animals, such as the human body. A few (calcium, potassium, sodium) are present in relatively larger amounts, whereas most others are trace metals, present in smaller but important amounts (the image shows the percentages for humans). Approximately 2/3 of the existing periodic table is composed of metals with varying properties, accounting for the diverse ways in which metals (usually in ionic form) have been utilized in nature and medicine.
  • 2.0K
  • 10 Oct 2022
Topic Review
Ken Cuccinelli
Kenneth Thomas Cuccinelli II (/ˈkuːtʃɪˈnɛli/ KOO-chi-NEL-ee; born July 30, 1968) is an American politician and lawyer currently serving as Principal Deputy Director of the U.S. Citizenship and Immigration Services (USCIS) agency and Acting Deputy Secretary of Homeland Security. He previously served as the 46th attorney general of Virginia from 2010 until 2014, and acting Director of USCIS agency. Before this, he was in the Virginia Senate, representing the 37th district in Fairfax County from 2002 until he took office as attorney general in 2010. On May 18, 2013, Cuccinelli won the Republican Party's gubernatorial nomination at the state party convention. Cuccinelli was the Republican nominee for Governor of Virginia in the 2013 Virginia gubernatorial election, losing to the Democratic nominee, Terry McAuliffe, by 56,435 votes or 2.5% of the total votes cast. A self-described opponent of homosexuality, Cuccinelli in his position as Virginia Attorney General defended anti-sodomy laws and prohibitions on same-sex marriage. Cuccinelli rejects the scientific consensus on climate change, and in his position as Attorney General investigated climate scientists whom he accused of fraud. He filed lawsuits against the Obama administration’s Environmental Protection Agency. Characterized as an immigration hard-liner, Cuccinelli sought to prohibit undocumented immigrants from attending universities, repeal birthright citizenship, and force employees to speak English in the workplace. As CIS Director, he implemented and defended policies that would reject applications for visas or permanent residency for immigrants considered likely to utilize publicly funded benefits programs.
  • 3.3K
  • 12 Oct 2022
Topic Review
Dacryocystocele
Dacryocystocele (Dacryocystitis) or timo cyst is a benign, bluish-gray mass in the inferomedial canthus that develops within a few days or weeks after birth. The uncommon condition forms as a result as a consequence of narrowing or obstruction of the nasolacrimal duct, usually during prenatal development. Nasolacrimal duct obstruction disrupts the lacrimal drainage system, eventually creating a swelling cyst in the lacrimal sac area by the nasal cavity. The location of the cyst can cause respiratory dysfunction, compromising the airway. The obstruction ultimately leads to epiphora, an abundance of tear production.
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  • 10 Oct 2022
Topic Review
Pingu
Pingu is a Swiss-British stop-motion clay animated children's comedy television series created by Otmar Gutmann and produced from 1990 to 2000 for Swiss television, and from 2003 to 2006 for British television by The Pygos Group (formerly Trickfilmstudio and Pingu Filmstudio). It centres on a family of anthropomorphic penguins who live at the South Pole; the main character is the family's son and title character, Pingu. The series originally ran for four series (each series made up of multiple seasons) from 7 March 1990 to 9 April 2000 on SF DRS and was then renewed for two more series from 1 August 2003 to 3 March 2006 on BBC Two. Pingu won a BAFTA award. Pingu was a worldwide hit, due to its lack of real spoken language: nearly all dialogue is in an invented grammelot "penguin language" referred to as 'Penguinese', consisting of babbling, muttering, and his characteristic sporadic loud honking noise, which can be popularly recognized as "Noot noot!" or other variants, stated to be "Noo, Noo!" by the defunct Pingu website's trivia page, accompanied by turning his beak into a megaphone-like shape. Within the first 4 series, all the characters were performed by Italian voice actor Carlo Bonomi, using a language of noises that he had already developed and used for the earlier Osvaldo Cavandoli's La Linea. In series 5 and 6, the Pingu cast was jointly voiced by David Sant and Marcello Magni. A Japanese reboot of the series, titled Pingu in the City, began airing on NHK-E on 7 October 2017.
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  • 12 Oct 2022
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