Portal:Technology

The Technology Portal


Technology ("science of craft", from Greek τέχνη, techne, "art, skill, cunning of hand"; and -λογία, -logia) is the sum of techniques, skills, methods, and processes used in the production of goods or services or in the accomplishment of objectives, such as scientific investigation. Technology can be the knowledge of techniques, processes, and the like, or it can be embedded in machines to allow for operation without detailed knowledge of their workings. Systems (e. g. machines) applying technology by taking an input, changing it according to the system's use, and then producing an outcome are referred to as technology systems or technological systems.

The simplest form of technology is the development and use of basic tools. The prehistoric discovery of how to control fire and the later Neolithic Revolution increased the available sources of food, and the invention of the wheel helped humans to travel in and control their environment. Developments in historic times, including the printing press, the telephone, and the Internet, have lessened physical barriers to communication and allowed humans to interact freely on a global scale.

Technology has many effects. It has helped develop more advanced economies (including today's global economy) and has allowed the rise of a leisure class. Many technological processes produce unwanted by-products known as pollution and deplete natural resources to the detriment of Earth's environment. Innovations have always influenced the values of a society and raised new questions in the ethics of technology. Examples include the rise of the notion of efficiency in terms of human productivity, and the challenges of bioethics.

Philosophical debates have arisen over the use of technology, with disagreements over whether technology improves the human condition or worsens it. Neo-Luddism, anarcho-primitivism, and similar reactionary movements criticize the pervasiveness of technology, arguing that it harms the environment and alienates people; proponents of ideologies such as transhumanism and techno-progressivism view continued technological progress as beneficial to society and the human condition.

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mechanical filter
A mechanical filter is a signal processing filter usually used in place of an electronic filter at radio frequencies to allow a range of signal frequencies to pass, but to block others. The filter acts on mechanical vibrations. Transducers at the input and output of the filter convert the electrical signal into, and then back from, these mechanical vibrations. The mechanical elements obey mathematical functions which are identical to their corresponding electrical elements. Electrical theory has developed a large library of mathematical forms that produce useful filter frequency responses for use in the design of mechanical filters. Steel and nickeliron alloys are common materials for mechanical filter components. Resonators in the filter made from these materials need to be machined to precisely adjust their resonance frequency prior to final assembly. The high "quality factor", Q, that mechanical resonators can attain, far higher than that of an all-electrical LC circuit, made possible the construction of mechanical filters with excellent selectivity. Good selectivity, being important in radio receivers, made such filters highly attractive. Contemporary researchers are working on microelectromechanical filters, the mechanical devices corresponding to electronic integrated circuits.


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Johannes Kepler
Johannes Kepler was a German Lutheran mathematician, astronomer and astrologer, and a key figure in the 17th century astronomical revolution. He is best known for his eponymous laws of planetary motion, codified by later astronomers based on his works Astronomia nova, Harmonices Mundi, and Epitome of Copernican Astronomy. Before Kepler, planets' paths were computed by combinations of the circular motions of the celestial orbs. After Kepler, astronomers shifted their attention from orbs to orbits—paths that could be represented mathematically as an ellipse. Kepler's laws also provided one of the foundations for Isaac Newton's theory of universal gravitation. During his career Kepler was a mathematics teacher at a Graz seminary school, an assistant to Tycho Brahe, the court mathematician to Emperor Rudolf II, a mathematics teacher in Linz, Austria, and an adviser to General Wallenstein. He also did fundamental work in the field of optics and helped to legitimize the telescopic discoveries of his contemporary Galileo Galilei.


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News

January 13, 2020 –
Visa Inc. purchases financial technology firm Plaid for US$5.3 billion, after it and Mastercard each invested US$250 million into the company last year. (Reuters)
January 13, 2020 – Houston Astros sign stealing scandal
Houston Astros general manager Jeff Luhnow and manager A. J. Hinch are suspended by Major League Baseball for the entire 2020 season after the league concludes its investigation into the team's illegal use of technology to steal signs during the team's championship 2017 season. They are also fired by the organization. (ESPN)

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Uses material from the Wikipedia article "Portal:Technology", released under the CC BY-SA 3.0 license.