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List Of National Inventors Hall Of Fame Inductees
The National Inventors Hall of Fame (NIHF) inductees includes over 600 inventors spanning three centuries of lifetimes. John Fitch was the earliest born inventor inducted into the NIHF (1743), while Barrett Comiskey Barrett Comiskey (born September 18, 1975) is an American innovator. He is recognized by the World Economic Forum as a Technology Pioneer and was the youngest inductee into the National Inventors Hall of Fame, for inventing and co-founding E Ink wh ... is currently the most recently born (1975). Key Inductees References External links The official website of the National Inventors Hall of Fame {{DEFAULTSORT:National Inventors Hall of Fame inductees Awards established in 1973 Lists of inventors ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Fitch (inventor)
John Fitch (January 21, 1743 – July 2, 1798) was an American inventor, clockmaker, entrepreneur and engineer. He was most famous for operating the first steamboat service in the United States. The first boat, 45 feet long, was tested on the Delaware River by Fitch and his design assistant Steven Pagano. Early life Fitch was born to Joseph Fitch and Sarah (Shaler) in Windsor, Connecticut, on January 21, 1743, on a farm that is part of present-day South Windsor, Connecticut. He received little formal schooling and eventually apprenticed himself to a clockmaker. During his apprenticeship, Fitch was not allowed to learn or even observe watchmaking (he later taught himself how to repair clocks and watches). He married Lucy Roberts on December 29, 1767. The couple had two children, a son and a daughter. In his autobiography, Fitch claimed that his wife was unhappy and argumentative and he used these reasons to explain why he abandoned his son and wife (pregnant at the time with a d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sled
A sled, skid, sledge, or sleigh is a land vehicle that slides across a surface, usually of ice or snow. It is built with either a smooth underside or a separate body supported by two or more smooth, relatively narrow, longitudinal runners similar in principle to skis. This reduces the amount of friction, which helps to carry heavy loads. Some designs are used to transport passengers or cargo across relatively level ground. Others are designed to go downhill for recreation, particularly by children, or competition. (Compare cross-country skiing with its downhill cousin.) Shades of meaning differentiating the three terms often reflect regional variations depending on historical uses and prevailing climate. In British English, ''sledge'' is the general term, and more common than ''sled''. ''Toboggan'' is sometimes used synonymously with ''sledge'' but more often to refer to a particular type of sledge without runners. ''Sleigh'' refers to a moderate to large-sized, usually ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Trapping
Optical tweezers (originally called single-beam gradient force trap) are scientific instruments that use a highly focused laser beam to hold and move microscopic and sub-microscopic objects like atoms, nanoparticles and droplets, in a manner similar to tweezers. If the object is held in air or vacuum without additional support, it can be called optical levitation. The laser light provides an attractive or repulsive force (typically on the order of piconewtons), depending on the relative refractive index between particle and surrounding medium. Levitation is possible if the force of the light counters the force of gravity. The trapped particles are usually micron-sized, or even smaller. Dielectric and absorbing particles can be trapped, too. Optical tweezers are used in biology and medicine (for example to grab and hold a single bacterium, a cell like a sperm cell or a blood cell, or a molecule like DNA), nanoengineering and nanochemistry (to study and build materials from singl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Home Page Reader
Home Page Reader (Hpr) was a computer program, a self-voicing web browser designed for people who are blind. It was developed by IBM from the work of Chieko Asakawa at IBM Japan. The screen reader met World Wide Web Consortium (W3C) HTML 4.01 specifications, Web Content Accessibility Guidelines 1.0 and User Agent Accessibility Guidelines 1.0. In 2006, it was announced on the Hpr mailing list that IBM ''does not have plans for any further updates of HPR'' and the software was subsequently withdrawn from sale by IBM in December 2006. IBM has given code to be used as a Firefox extension. The program also had a peer-support mailing list.Its archives were available at http://www.talklist.com/forms/ibm-hpr Criticism In summer 2002 a non-scientific study concluded that Hpr did not make any distinction between the built-in keyboard shortcuts for entering different modes and the access key In a web browser, an access key or accesskey allows a computer user to immediately jump to a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enzymes
Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrate (chemistry), substrates, and the enzyme converts the substrates into different molecules known as product (chemistry), products. Almost all metabolism, metabolic processes in the cell (biology), cell need enzyme catalysis in order to occur at rates fast enough to sustain life. Metabolic pathways depend upon enzymes to catalyze individual steps. The study of enzymes is called ''enzymology'' and the field of pseudoenzyme, pseudoenzyme analysis recognizes that during evolution, some enzymes have lost the ability to carry out biological catalysis, which is often reflected in their amino acid sequences and unusual 'pseudocatalytic' properties. Enzymes are known to catalyze more than 5,000 biochemical reaction types. Other biocatalysts are Ribozyme, catalytic RNA molecules, called ribozymes. Enzymes' Chemical specificity, specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicopter Bucket
A helicopter bucket is a specialised bucket suspended on a cable carried by a helicopter to deliver water for aerial firefighting. Each bucket has a release valve on the bottom which is controlled by the helicopter crew. When the helicopter is in position, the crew releases the water to extinguish or suppress the fire below. Each release of the water is referred to as a drop. The design of the buckets allows the helicopter to hover over a water source – such as a lake, river, pond, or tank – and lower the bucket into the water to refill it. This allows the helicopter crew to operate the bucket in remote locations without the need to return to a permanent operating base, reducing the time between successive drops. Design Buckets can be collapsible or rigid and vary in capacity from . The size of each bucket is determined by the lifting capacity of the helicopter required to utilise each version. Some buckets can include fire retardant foam or the ability to pump wate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
FM Radio
FM broadcasting is a method of radio broadcasting using frequency modulation (FM). Invented in 1933 by American engineer Edwin Armstrong, wide-band FM is used worldwide to provide high fidelity sound over broadcast radio. FM broadcasting is capable of higher fidelity—that is, more accurate reproduction of the original program sound—than other broadcasting technologies, such as AM broadcasting. It is also less susceptible to common forms of interference, reducing static and popping sounds often heard on AM. Therefore, FM is used for most broadcasts of music or general audio (in the audio spectrum). FM radio stations use the very high frequency range of radio frequencies. Broadcast bands Throughout the world, the FM broadcast band falls within the VHF part of the radio spectrum. Usually 87.5 to 108.0 MHz is used, or some portion thereof, with few exceptions: * In the former Soviet republics, and some former Eastern Bloc countries, the older 65.8–74 MHz band ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Movie Projector
A movie projector is an optics, opto-mechanics, mechanical device for displaying Film, motion picture film by projecting it onto a movie screen, screen. Most of the optical and mechanical elements, except for the illumination and sound devices, are present in movie cameras. Modern movie projectors are specially built video projectors. (see also digital cinema) Many projectors are specific to a particular film gauge and not all movie projectors are film projectors since the use of film is required. Predecessors The main precursor to the movie projector was the magic lantern. In its most common setup it had a concave mirror behind a light source to help direct as much light as possible through a painted glass picture slide and a lens, out of the lantern onto a screen. Simple mechanics to have the painted images moving were probably implemented since Christiaan Huygens introduced the apparatus around 1659. Initially candles and oil lamps were used, but other light sources, such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frequency-hopping Spread Spectrum
Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many distinct frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver. FHSS is used to avoid interference, to prevent eavesdropping, and to enable code-division multiple access (CDMA) communications. The available frequency band is divided into smaller sub-bands. Signals rapidly change ("hop") their carrier frequencies among the center frequencies of these sub-bands in a predetermined order. Interference at a specific frequency will affect the signal only during a short interval. FHSS offers four main advantages over a fixed-frequency transmission: # FHSS signals are highly resistant to narrowband interference because the signal hops to a different frequency band. # Signals are difficult to intercept if the frequency-hopping pattern is not known. # Jamming is also difficult if the p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Telescope Mirror Cell
In astronomy, a mirror support cell - more commonly mirror cell - is a component of a reflecting telescope that supports the mirror in place to hold optical alignment, allow collimation adjustment, and protect it from falling out. The common usage of the word denotes the cell that holds the primary mirror (M1), however technically it could also be used to denote the support assembly (usually called a ''spider'' or ''strut'') for the secondary mirror (M2) or other mirrors. Overview Basic cells A basic mirror cell can be built using minimal calculation and simple materials. Only slightly more complex are the wooden, plastic or metal cells which are often glued and which are either not user adjustable or which have only limited adjustment and which are used in lower end commercial telescopes and smaller amateur-built telescopes. Cells for more sophisticated "small" telescopes Telescope makers seeking to build larger "small" telescopes with thinner mirrors find simple designs inade ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laser Dermatology
Laser medicine consists in the use of lasers in medical diagnosis, treatments, or therapies, such as laser photodynamic therapy, photorejuvenation, and laser surgery. Lasers Lasers used in medicine include in principle any type of laser, but especially: * CO2 lasers, used to cut, vaporize, ablate and photo-coagulate soft tissue. * diode lasers * dye lasers * excimer lasers * fiber lasers * gas lasers * free electron lasers * semiconductor diode lasers Applications in medicine Examples of procedures, practices, devices, and specialties where lasers are utilized include: * angioplasty * cancer diagnosis *cancer treatment * Dentistry * cosmetic dermatology such as scar revision, skin resurfacing, laser hair removal, tattoo removal * dermatology, to treat melanoma * frenectomy * lithotripsy *laser mammography * medical imaging * microscopy * ophthalmology (includes Lasik and laser photocoagulation) * optical coherence tomography * optogenetics * prostatectomy * plastic surg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Windshield Wiper
A windscreen wiper, windshield wiper, wiper blade (American English), or simply wiper, is a device used to remove rain, snow, ice, washer fluid, water, or debris from a vehicle's front window. Almost all motor vehicles, including cars, trucks, buses, train locomotives, and watercraft with a cabin—and some aircraft—are equipped with one or more such wipers, which are usually a legal requirement. A wiper generally consists of a metal arm; one end pivots, and the other end has a long rubber blade attached to it. The arm is powered by a motor, often an electric motor, although pneumatic power is also used for some vehicles. The blade is swung back and forth over the glass, pushing water, other precipitation, or any other impediments to visibility from its surface. The speed is usually adjustable on vehicles made after 1969, with several continuous rates and often one or more ''intermittent'' settings. Most personal automobiles use two synchronized ''radial''-type arms, wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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