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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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2D Filters
Two dimensional filters have seen substantial development effort due to their importance and high applicability across several domains. In the 2-D case the situation is quite different from the 1-D case, because the multi-dimensional polynomials cannot in general be factored. This means that an arbitrary transfer function cannot generally be manipulated into a form required by a particular implementation. The input-output relationship of a 2-D IIR filter obeys a constant-coefficient linear partial difference equation from which the value of an output sample can be computed using the input samples and previously computed output samples. Because the values of the output samples are fed back, the 2-D filter, like its 1-D counterpart, can be unstable.
  • 1.3K
  • 26 Oct 2022
Topic Review
Patikulamanasikara
Paṭikkūlamanasikāra (variant: paṭikūlamanasikāra) is a Pāli term that is generally translated as "reflections on repulsiveness". It refers to a traditional Buddhist meditation whereby thirty-one parts of the body are contemplated in a variety of ways. In addition to developing sati (mindfulness) and samādhi (concentration), this form of meditation is considered conducive to overcoming desire and lust. Along with cemetery contemplations, this type of meditation is one of the two meditations on "the foul"/unattractiveness (Pāli: asubha).
  • 2.0K
  • 26 Oct 2022
Topic Review
Burnin' Rubber (Series)
Burnin' Rubber is a series of vehicular combat racing video games developed by Xform and published by various companies. The series has appeared on AirConsole, Android, Browser, IOS, and Microsoft Windows. The gameplay mainly focuses on the player having to beat a set of challenges ranging from races, boss battles, and time trials. Players can gain various pickups and collectables placed throughout tracks to aid them in the event and unlock new content. The series previous used Adobe Director and Adobe Shockwave Player for its games and has since migrated to Unity. Burnin' Rubber 3 was the first game in the series to introduce the addition of weapons in which the player can add to their vehicles which would become one of the game's main element moving forward. Excluding Burnin' Rubber (2007), the vehicles can receive damage or explode once critical damage levels has been surpassed. The series takes some inspiration from the Burnout series.
  • 3.6K
  • 26 Oct 2022
Topic Review
Gordon Decomposition
In mathematical physics, the Gordon-decomposition (named after Walter Gordon one of the discoverers of the Klein-Gordon equation) of the Dirac current is a splitting of the charge or particle-number current into a part that arises from the motion of the center of mass of the particles and a part that arises from gradients of the spin density. It makes explicit use of the Dirac equation and so it applies only to "on-shell" solutions of the Dirac equation.
  • 1.5K
  • 26 Oct 2022
Topic Review
Seifert–Van Kampen Theorem
In mathematics, the Seifert–van Kampen theorem of algebraic topology (named after Herbert Seifert and Egbert van Kampen), sometimes just called van Kampen's theorem, expresses the structure of the fundamental group of a topological space [math]\displaystyle{ X }[/math] in terms of the fundamental groups of two open, path-connected subspaces that cover [math]\displaystyle{ X }[/math]. It can therefore be used for computations of the fundamental group of spaces that are constructed out of simpler ones.
  • 1.1K
  • 27 Oct 2022
Topic Review
Malacostraca
Malacostraca (from New Latin; from grc μαλακός (malakós) 'soft', and όστρακον "shell") is the largest of the six classes of crustaceans, containing about 40,000 living species, divided among 16 orders. Its members, the malacostracans, display a great diversity of body forms and include crabs, lobsters, crayfish, shrimp, krill, prawns, woodlice, amphipods, mantis shrimp and many other, less familiar animals. They are abundant in all marine environments and have colonised freshwater and terrestrial habitats. They are segmented animals, united by a common body plan comprising 20 body segments (rarely 21), and divided into a head, thorax, and abdomen.
  • 3.5K
  • 31 Oct 2022
Topic Review
Converse (Logic)
In logic and mathematics, the converse of a categorical or implicational statement is the result of reversing its two constituent statements. For the implication P → Q, the converse is Q → P. For the categorical proposition All S are P, the converse is All P are S. Either way, the truth of the converse is generally independent from that of the original statement.
  • 1.8K
  • 27 Oct 2022
Topic Review
Psycholinguistics
Psycholinguistics or psychology of language is the study of the psychological and neurobiological factors that enable humans to acquire, use, and understand language. Initial forays into psycholinguistics were largely philosophical ventures, due mainly to a lack of cohesive data on how the human brain functioned. Modern research makes use of biology, neuroscience, cognitive science, and information theory to study how the brain processes language. There are a number of subdisciplines; for example, as non-invasive techniques for studying the neurological workings of the brain become more and more widespread, neurolinguistics has become a field in its own right. Psycholinguistics covers the cognitive processes that make it possible to generate a grammatical and meaningful sentence out of vocabulary and grammatical structures, as well as the processes that make it possible to understand utterances, words, text, etc. Developmental psycholinguistics studies infants' and children's ability to learn language, usually with experimental or at least quantitative methods (as opposed to naturalistic observations such as those made by Jean Piaget in his research on the development of children).
  • 1.7K
  • 26 Oct 2022
Topic Review
Interactivity
Across the many fields concerned with interactivity, including information science, computer science, human-computer interaction, communication, and industrial design, there is little agreement over the meaning of the term "interactivity", but most definitions are related to interaction between users and computers and other machines through a user interface. Interactivity can however also refer to interaction between people. It nevertheless usually refers to interaction between people and computers – and sometimes to interaction between computers – through software, hardware, and networks. Multiple views on interactivity exist. In the "contingency view" of interactivity, there are three levels: One body of research has made a strong distinction between interaction and interactivity. As the suffix 'ity' is used to form nouns that denote a quality or condition, this body of research has defined interactivity as the 'quality or condition of interaction'. These researchers suggest that the distinction between interaction and interactivity is important since interaction may be present in any given setting, but the quality of the interaction varies from low and high.
  • 3.5K
  • 26 Oct 2022
Topic Review
IPTV
Internet Protocol television (IPTV) is the delivery of television content over Internet Protocol (IP) networks. This is in contrast to delivery through traditional terrestrial, satellite, and cable television formats. Unlike downloaded media, IPTV offers the ability to stream the source media continuously. As a result, a client media player can begin playing the content (such as a TV channel) almost immediately. This is known as streaming media. Although IPTV uses the Internet protocol it is not limited to television streamed from the Internet, (Internet television). IPTV is widely deployed in subscriber-based telecommunications networks with high-speed access channels into end-user premises via set-top boxes or other customer-premises equipment. IPTV is also used for media delivery around corporate and private networks. IPTV in the telecommunications arena is notable for its ongoing standardisation process (e.g., European Telecommunications Standards Institute). IPTV services may be classified into three main groups:  Live television and live media, with or without related interactivity; Time-shifted media: e.g. catch-up TV (replays a TV show that was broadcast hours or days ago), start-over TV (replays the current TV show from its beginning); Video on demand (VOD): browse and view items in a stored media catalogue.
  • 7.0K
  • 27 Oct 2022
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