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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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Steelhead Trout
Steelhead Trout is a name given to the anadromous form of the coastal rainbow trout (Oncorhynchus. m. irideus) or redband trout (O. m. gairdneri). The steelhead are native to freshwater and ocean environments across North America, but have been introduced to every other continent except Antarctica. Steelhead use aquatic obstructions like vegetation, boulders, and fallen trees as protection. Steelhead migrate to spawn during the summer months and the winter months.
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  • 14 Oct 2022
Topic Review
Amira
Amira (pronounce: Ah-meer-ah) is a software platform for 3D and 4D data visualization, processing, and analysis. It is being actively developed by Thermo Fisher Scientific in collaboration with the Zuse Institute Berlin (ZIB), and commercially distributed by Thermo Fisher Scientific.
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  • 14 Oct 2022
Topic Review
Electronic Trading
Electronic or scripless trading, sometimes called e-trading or paperless trading is a method of trading securities (such as stocks, and bonds), foreign exchange or financial derivatives electronically. Information technology is used to bring together buyers and sellers through an electronic trading platform and network to create virtual market places. They can include various exchange-based systems, such as NASDAQ, NYSE Arca and Globex, as well as other types of trading platforms, such as electronic communication networks (ECNs), alternative trading systems, crossing networks and "dark pools". Electronic trading is rapidly replacing human trading in global securities markets. Electronic trading is in contrast to older floor trading and phone trading and has a number of advantages, but glitches and cancelled trades do still occur.
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  • 14 Oct 2022
Topic Review
Affect Measures
Affect measures (measures of affect or measures of emotion) are used in the study of human affect (including emotions and mood), and refer to measures obtained from self-report studies asking participants to quantify their current feelings or average feelings over a longer period of time. Even though some affect measures contain variations that allow assessment of basic predispositions to experience a certain emotion, tests for such stable traits are usually considered to be personality tests.
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  • 14 Oct 2022
Topic Review
Glossary of Chemical Formulas
This is a list of common chemical compounds with chemical formulas and CAS numbers, indexed by formula. This complements alternative listing at inorganic compounds by element. There is no complete list of chemical compounds since by nature the list would be infinite. Note: There are elements for which spellings may differ, such as aluminum/ aluminum, sulfur/ sulfur, and cesium/ cesium.
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  • 14 Oct 2022
Topic Review
Fat Leonard Scandal
The Fat Leonard scandal is a corruption scandal and ongoing investigation within the United States Navy involving ship support contractor Glenn Defense Marine Asia (GDMA), a subsidiary of the Glenn Marine Group. The Washington Post called the scandal "perhaps the worst national-security breach of its kind to hit the Navy since the end of the Cold War." At the heart of the scandal was Glenn Defense Marine Asia, a firm run by Leonard Glenn Francis, a Malaysian national known as "Fat Leonard" for his then over 350 pound weight. Francis provided at least a half million dollars in cash, plus travel expenses, luxury items, and prostitutes to a large number of U.S. uniformed officers of the United States Seventh Fleet, who in turn gave him classified material about the movements of U.S. ships and submarines, confidential contracting information, and information about active law enforcement investigations into Glenn Defense Marine Asia. Francis then "exploited the intelligence for illicit profit, brazenly ordering his moles to redirect aircraft carriers to ports he controlled in Southeast Asia so he could more easily bilk the Navy for fuel, tugboats, barges, food, water and sewage removal." The Navy, through GDMA, even employed divers to search harbors for explosives. He also directed them to author "Bravo Zulu" memos, which is an informal term for a letter of commendation from the Navy given to civilians who have performed outstanding services for the Navy, in order to bolster GDMA's credibility for jobs "well done". The first activities of the conspiracy were confirmed to have existed in 2006 when Francis recruited numerous Navy personnel to engage in corruption, including directing contracts toward his firm, disfavoring competitors, and inhibiting legitimate fiscal and operational oversight. The initial co-conspirators labelled themselves "the cool kids" and "the wolf pack." U.S. federal prosecutors filed criminal charges against 33 people in connection with the Fat Leonard scandal. Of those, 22 pleaded guilty: Francis himself, four of his top aides, and 17 Navy officials (specifically, at least ten commissioned officers, two petty officers, one former NCIS special agent, and two civilian Navy contracting officials). Nine others are awaiting trial in U.S. district court in San Diego. Separately, five Navy officers were charged with crimes under the Uniform Code of Military Justice (UCMJ) and have been subject to court-martial proceedings. An additional civilian pleaded guilty to a scandal-related crime in Singapore court. Suffering health problems, Francis was hospitalized and released in March 2018. Rather than returning to the custody of the U.S. Marshals Service, he was granted a medical furlough and allowed to stay in San Diego at a private residence owned by one of his physicians, under 24-hour surveillance for which his family paid. At a deposition taken in 2018 in the David A. Morales case, Francis said he is being treated for kidney cancer. In 1989, when he was 21, Francis had been sentenced to three years in jail in Malaysia for firearms possession.
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  • 14 Oct 2022
Topic Review
Root-Finding Algorithm
In mathematics and computing, a root-finding algorithm is an algorithm for finding zeroes, also called "roots", of continuous functions. A zero of a function f, from the real numbers to real numbers or from the complex numbers to the complex numbers, is a number x such that f(x) = 0. As, generally, the zeroes of a function cannot be computed exactly nor expressed in closed form, root-finding algorithms provide approximations to zeroes, expressed either as floating point numbers or as small isolating intervals, or disks for complex roots (an interval or disk output being equivalent to an approximate output together with an error bound). Solving an equation f(x) = g(x) is the same as finding the roots of the function h(x) = f(x) – g(x). Thus root-finding algorithms allow solving any equation defined by continuous functions. However, most root-finding algorithms do not guarantee that they will find all the roots; in particular, if such an algorithm does not find any root, that does not mean that no root exists. Most numerical root-finding methods use iteration, producing a sequence of numbers that hopefully converge towards the root as a limit. They require one or more initial guesses of the root as starting values, then each iteration of the algorithm produces a successively more accurate approximation to the root. Since the iteration must be stopped at some point these methods produce an approximation to the root, not an exact solution. Many methods compute subsequent values by evaluating an auxiliary function on the preceding values. The limit is thus a fixed point of the auxiliary function, which is chosen for having the roots of the original equation as fixed points, and for converging rapidly to these fixed points. The behaviour of general root-finding algorithms is studied in numerical analysis. However, for polynomials, root-finding study belongs generally to computer algebra, since algebraic properties of polynomials are fundamental for the most efficient algorithms. The efficiency of an algorithm may depend dramatically on the characteristics of the given functions. For example, many algorithms use the derivative of the input function, while others work on every continuous function. In general, numerical algorithms are not guaranteed to find all the roots of a function, so failing to find a root does not prove that there is no root. However, for polynomials, there are specific algorithms that use algebraic properties for certifying that no root is missed, and locating the roots in separate intervals (or disks for complex roots) that are small enough to ensure the convergence of numerical methods (typically Newton's method) to the unique root so located.
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  • 14 Oct 2022
Topic Review
Murano Glass
Murano glass is made on the Venetian island of Murano, which has been a glassmaking center for over 700 years. It is also sometimes referred to as Venetian glass. Today Murano is known for its art glass, but it has a long history of innovations in glassmaking in addition to its artistic fame—and was Europe's first major glassmaking center. During the 1400s, Murano glassmakers created cristallo—which was almost transparent and considered the finest glass in the world. Murano glassmakers also developed a white-colored glass (milk glass called lattimo) that looked like porcelain. They later became Europe's finest makers of mirrors. Originally, Venice was controlled by the Eastern Roman Empire, but it eventually became an independent city state. It flourished as a trading center and seaport. Its connections with the Middle East helped its glassmakers gain additional skills, as glassmaking was more advanced in countries such as Syria and Egypt. Although Venetian glassmaking existed as far back as the 8th Century, it became concentrated in Murano by law beginning 1291. Since glass factories often caught fire, this removed much of the possibility of a major fire disaster for the city. Murano glassmakers developed secret recipes and methods for making glass, and the concentration of Venice's glassmaking on the island of Murano enabled better control of those secrets. Murano became Europe's elite glassmaking center, peaking in popularity in the 15th and 16th centuries. Venice's dominance in trade along the Mediterranean Sea created a wealthy merchant class that was a strong connoisseur of the arts. This helped establish demand for art glass and more innovations. The spread of glassmaking talent in Europe eventually diminished the importance of Venice and its Murano glassmakers. A defeat by Napoleon Bonaparte in 1797, and occupation, caused more hardship for Murano's glassmaking industry. Murano glassmaking began a revival in the 1920s. Today, Murano and Venice are tourist attractions, and Murano is home to numerous glass factories and a few individual artists' studios. Its Museo del Vetro (Glass Museum) in the Palazzo Giustinian contains displays on the history of glassmaking as well as glass samples ranging from Egyptian times through the present day.
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  • 14 Oct 2022
Topic Review
Cyclops (Genus)
Cyclops is one of the most common genera of freshwater copepods, comprising over 400 species. Together with other similar-sized non-copepod fresh-water crustaceans, especially cladocera, they are commonly called water fleas. The name Cyclops comes from the Cyclops of Greek mythology which shares the quality of having a single large eye, which may be either red or black in Cyclops.
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  • 14 Oct 2022
Topic Review
Anisakis
Anisakis is a genus of parasitic nematodes that have life cycles involving fish and marine mammals. They are infective to humans and cause anisakiasis. People who produce immunoglobulin E in response to this parasite may subsequently have an allergic reaction, including anaphylaxis, after eating fish infected with Anisakis species.
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  • 14 Oct 2022
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