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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Bilinear Filtering
Bilinear filtering is a texture filtering method used to smooth textures when displayed larger or smaller than they actually are. Most of the time, when drawing a textured shape on the screen, the texture is not displayed exactly as it is stored, without any distortion. Because of this, most pixels will end up needing to use a point on the texture that is "between" texels – assuming the texels are points (as opposed to, say, squares) – in the middle (or on the upper left corner, or anywhere else; it does not matter, as long as it is consistent) of their respective "cells". Bilinear filtering uses these points to perform bilinear interpolation between the four texels nearest to the point that the pixel represents (in the middle or upper left of the pixel, usually).
  • 1.3K
  • 02 Nov 2022
Topic Review
Copy-number Variation
Copy number variation (CNV) is a phenomenon in which sections of the genome are repeated and the number of repeats in the genome varies between individuals. Copy number variation is a type of structural variation: specifically, it is a type of duplication or deletion event that affects a considerable number of base pairs. Approximately two-thirds of the entire human genome may be composed of repeats and 4.8–9.5% of the human genome can be classified as copy number variations. In mammals, copy number variations play an important role in generating necessary variation in the population as well as disease phenotype. Copy number variations can be generally categorized into two main groups: short repeats and long repeats. However, there are no clear boundaries between the two groups and the classification depends on the nature of the loci of interest. Short repeats include mainly bi-nucleotide repeats (two repeating nucleotides e.g. A-C-A-C-A-C...) and tri-nucleotide repeats. Long repeats include repeats of entire genes. This classification based on size of the repeat is the most obvious type of classification as size is an important factor in examining the types of mechanisms that most likely gave rise to the repeats, hence the likely effects of these repeats on phenotype.
  • 1.5K
  • 02 Nov 2022
Topic Review
KTHNY Theory
The KTHNY-theory describes melting of crystals in two dimensions (2D). The name is derived from the initials of the surnames of John Michael Kosterlitz, David J. Thouless, Bertrand Halperin, David R. Nelson, and A. Peter Young, who developed the theory in the 1970s. It is, beside the Ising model in 2D and the XY model in 2D, one of the few theories, which can be solved analytically and which predicts a phase transition at a temperature [math]\displaystyle{ T \gt 0 }[/math].
  • 927
  • 02 Nov 2022
Topic Review
Container Linux by CoreOS
Container Linux by CoreOS (formerly CoreOS Linux) is an open-source lightweight operating system based on the Linux kernel and designed for providing infrastructure to clustered deployments, while focusing on automation, ease of application deployment, security, reliability and scalability. As an operating system, Container Linux provides only the minimal functionality required for deploying applications inside software containers, together with built-in mechanisms for service discovery and configuration sharing. Container Linux shares foundations with Gentoo Linux, Chrome OS and Chromium OS, through a common software development kit (SDK). Container Linux adds new functionality and customization to this shared foundation to support server hardware and use cases.:7:02 (As of January 2015), CoreOS is actively developed, primarily by Alex Polvi, Brandon Philips and Michael Marineau, with its major features available as a stable release.
  • 1.9K
  • 02 Nov 2022
Topic Review
PXL-2000
The PXL-2000 (also known as Fisher-Price PXL2000, Fisher-Price PixelVision, Sanwa Sanpix1000, KiddieCorder, and Georgia) is a toy black-and-white camcorder produced in 1987 that uses a compact audio cassette as its recording medium. The PXL-2000 was created by a team of inventors led by James Wickstead, who sold the rights to Fisher-Price in 1987 at the American International Toy Fair in Manhattan. Surviving on the market for merely a year, only around 400,000 units were ever produced, resulting in the PXL-2000's eventual present status as a sought-after cult object among many artists and media historians.
  • 1.6K
  • 02 Nov 2022
Topic Review
X12 Document List
The following is a list of the approved EDI ANSI X12 documents for EDI version 4 Release 1 (004010).
  • 635
  • 02 Nov 2022
Topic Review
Royal Marriages Act 1772
The Royal Marriages Act 1772 was an act of the Parliament of Great Britain which prescribed the conditions under which members of the British royal family could contract a valid marriage, in order to guard against marriages that could diminish the status of the royal house. The right of veto vested in the sovereign by this act provoked severe adverse criticism at the time of its passage. It was repealed as a result of the 2011 Perth Agreement, which came into force on 26 March 2015. Under the Succession to the Crown Act 2013, the first six people in the line of succession need permission to marry if they and their descendants are to remain in the line of succession.
  • 6.7K
  • 02 Nov 2022
Topic Review
Latino Studies
Latino studies is an academic discipline which studies the experience of people of Hispanic ancestry in the United States. Closely related to other ethnic studies disciplines such as African-American studies, Asian American studies, and Native American studies, Latino studies critically examines the history, culture, politics, issues, and experiences of Hispanic people. Drawing from numerous disciplines such as sociology, history, literature, political science, religious studies and gender studies, Latino studies scholars consider a variety of perspectives and employ diverse analytical tools in their work.
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  • 02 Nov 2022
Topic Review
Dracorex
Dracorex is a controversial dinosaur genus of the family Pachycephalosauridae, from the Late Cretaceous of North America. The type (and only known) species is Dracorex hogwartsia, meaning "dragon king of Hogwarts". This dinosaur is named for the wizard school in Harry Potter books. It is known from one nearly complete skull (the holotype TCMI 2004.17.1), as well as four cervical vertebrae: the atlas, third, eighth and ninth. These were discovered in the Hell Creek Formation in South Dakota by three amateur paleontologists from Sioux City, in the U.S. state of Iowa. The skull was subsequently donated to the Children's Museum of Indianapolis for study in 2004, and was formally described by Bob Bakker and Robert Sullivan in 2006. However, Jack Horner et al. suspect that it is a juvenile Pachycephalosaurus and an analysis of pachycephalosaur fossils by a joint team from the University of California, Berkeley and the Museum of the Rockies has questioned the validity of two named genera of pachycephalosaur, Dracorex and Stygimoloch. According to the team, specimens of Dracorex and Stygimoloch might actually represent earlier growth stages of Pachycephalosaurus. This has been supported in a 2016 analysis of the youngest Pachycephalosaurus material known, which indicates that the unique features of Dracorex represent instead ontogenetically variant features on a Pachycephalosaurus growth curve.
  • 6.2K
  • 03 Nov 2022
Topic Review
Valence
In chemistry, the valence (US spelling) or valency (British spelling) of an element is the measure of its combining capacity with other atoms when it forms chemical compounds or molecules.
  • 4.2K
  • 02 Nov 2022
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