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Persistence Of Vision
Persistence of vision is the optical illusion that occurs when the visual perception of an object does not cease for some time after the Light ray, rays of light proceeding from it have ceased to enter the eye. The illusion has also been described as "retinal persistence", "persistence of impressions", simply "persistence" and other variations. A very commonly given example of the phenomenon is the apparent fiery trail of a glowing coal or burning stick while it is whirled around in the dark. In recent theories about iconic memory, visual sensory memory, higher-level (cortical) informational persistence is considered a more relevant component of normal vision than the lower-level aspect of visible persistence. Many explanations of the illusion actually seem to describe Afterimage#Positive afterimages, positive afterimages and the neurological effect can be compared to the technological effect of motion blur in photography (or in film and video). "Persistence of vision" can a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nottingham MMB 01 Forest Rec Ground
Nottingham ( , locally ) is a city and unitary authority area in Nottinghamshire, East Midlands, England. It is located south-east of Sheffield and north-east of Birmingham. Nottingham is the legendary home of Robin Hood and to the lace-making, bicycle and tobacco industries. The city is also the county town of Nottinghamshire and the settlement was granted its city charter in 1897, as part of Queen Victoria's Diamond Jubilee celebrations. In the 2021 Census, Nottingham had a reported population of 323,632. The wider conurbation, which includes many of the city's suburbs, has a population of 768,638. It is the largest urban area in the East Midlands and the second-largest in the Midlands. Its Functional Urban Area, the largest in the East Midlands, has a population of 919,484. The population of the Nottingham/Derby metropolitan area is estimated to be 1,610,000. The metropolitan economy of Nottingham is the seventh-largest in the United Kingdom with a GDP of $50.9 bil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simon Stampfer
Simon Ritter von Stampfer (26 October 1792 (according to other sources 1790)), in Windisch-Mattrai, Archbishopric of Salzburg, today called Matrei in Osttirol, Tyrol (state), Tyrol – 10 November 1864 in Vienna) was an Austrian mathematician, Surveying, surveyor and inventor. His most famous invention is that of the stroboscopic disk which has a claim to be the first device to show moving images. Almost simultaneously, a similar device was developed in Belgium (the Phenakistoscope, phenakistiscope). Life Youth and education Simon Ritter von Stampfer was born in Matrei in Osttirol, and was the first son of Bartlmä Stampfer, a weaving, weaver. From 1801 he attended the local school and in 1804 and moved to the Franciscan Gymnasium in Lienz, where he studied until 1807. From there he went to the Lyceum in Salzburg, to study philosophy, however he was not assessed. In 1814 in Munich, he passed the state examination and applied there as a teacher. He chose, however, to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tachistoscope
A tachistoscope is a device that displays a picture, text, or an object for a specific amount of time. It can be used for various purposes such as to increase recognition speed, to show something too fast to be consciously recognized, or to test which elements of a display are memorable. Early tachistoscopes were mechanical, using a flat masking screen containing a window. The screen concealed the picture or text until the screen moved, at a known speed, the window over the picture or text, revealing it. The screen continued to move until it hid the picture or text again. Later tachistoscopes used a shutter system typical of a camera in conjunction with a slide or transparency projector. Even later, tachistoscopes used brief illumination, such as from fast-onset and fast-offset fluorescent lamps, of the material to be displayed. By the late 1990s, tachistoscopes had largely been replaced by computers for displaying pictures and text. History The first tachistoscope was orig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Ayrton Paris
John Ayrton Paris, FRS (7 August 178524December 1856) was a British physician. He is a possible inventor of the thaumatrope, which he published with W. Phillips in April 1825. Life Paris made one of the earliest observations of occupational causes of cancer when, in 1822, he recognised that exposure to arsenic fumes might be contributing to the unusually high rate of scrotal skin cancer among men working in copper-smelting in Cornwall and Wales. He also wrote about accidents caused by explosives in mines and gave lectures on chemistry to the Royal Geological Society of Cornwall, serving as its first secretary. In 1844, he was elected president of the Royal College of Physicians, an office he held until his death. He was elected a Fellow of the Royal Society in June 1821. Paris advocated for the use of scientifically assessed herbal preparations in medical treatment. The exact date and location of Paris's birth are uncertain, with some sources listing 7 August 1785, and othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thaumatrope
A thaumatrope is an optical toy that was introduced in 1825. When the strings attached to the small illustrated disk are twirled quickly between the fingers, the depicted elements on either side of the disk appear to blend into one image. It was explained as the result of visual impressions lingering in the mind for about one-eighth of a second after the image has been removed. Examples of common thaumatrope pictures include a bare tree on one side of the disk, and its leaves on the other, or a bird on one side and a cage on the other. Many classic thaumatropes also included riddles or short poems, with one line on each side. In addition to superimposing images, it's "persistence of vision" effect is a disputed explanation for the cause of illusory motion in stroboscopic animation and film. Thaumatropes can provide an illusion of motion with the two sides of the disc each depicting a different phase of the motion, but no examples are known to have been produced until long after ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isaac Newton
Sir Isaac Newton () was an English polymath active as a mathematician, physicist, astronomer, alchemist, theologian, and author. Newton was a key figure in the Scientific Revolution and the Age of Enlightenment, Enlightenment that followed. His book (''Mathematical Principles of Natural Philosophy''), first published in 1687, achieved the Unification of theories in physics#Unification of gravity and astronomy, first great unification in physics and established classical mechanics. Newton also made seminal contributions to optics, and Leibniz–Newton calculus controversy, shares credit with German mathematician Gottfried Wilhelm Leibniz for formulating calculus, infinitesimal calculus, though he developed calculus years before Leibniz. Newton contributed to and refined the scientific method, and his work is considered the most influential in bringing forth modern science. In the , Newton formulated the Newton's laws of motion, laws of motion and Newton's law of universal g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LED Light
An LED lamp or LED light is an electric light that produces light using light-emitting diodes (LEDs). LED lamps are significantly more Electrical efficiency, energy-efficient than equivalent Incandescent light bulb, incandescent lamps and fluorescent lamps. The most efficient commercially available LED lamps have efficiencies exceeding 200 lumen (unit), lumens per watt (lm/W) and convert more than half the input power into light. Commercial LED lamps have a lifespan several times longer than both incandescent and fluorescent lamps. LED lamps require an electronic LED circuit to operate from mains power lines, and losses from this circuit means that the efficiency of the lamp is lower than the efficiency of the LED chips it uses. The driver circuit may require special features to be compatible with lamp dimmers intended for use on incandescent lamps. Generally the current waveform contains some amount of distortion, depending on the luminaires' technology. The LED lamp marke ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Light Painting Screw
Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent to the infrared (with longer wavelengths and lower frequencies) and the ultraviolet (with shorter wavelengths and higher frequencies), called collectively '' optical radiation''. In physics, the term "light" may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. The primary properties of light are intensity, propagation direction, frequency or wavelength spectrum, and polarization. Its speed in vacuum, , is one of the fundamental constants of nature. All electromagnetic radiation exhibits some properties of both particles and waves. Sin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sparkler
A sparkler is a type of hand-held firework that burns slowly while emitting bright, colored sparks. It burns in high temperature (over 1000°C), so it can be very dangerous. Sparklers are particularly popular with children. In the United Kingdom, a sparkler is often used by children at bonfire and fireworks displays on Guy Fawkes Night, the fifth of November, and in the United States on Independence Day. They are called ''phuljhadi'' in Hindi and are especially popular during the Diwali festival. Composition Sparklers are generally formed around a thin non-combustible metallic wire, about long, that has been dipped in a thick batter of slow-burning pyrotechnic composition and allowed to dry. The combustible coating contains the following components; multiple ingredients can be used: * Metallic fuel, main reactive ingredient; type of metals influences the color of sparks; size of particles influences shape and size of the sparks ** Aluminium, magnesium or magnalium, f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Patrick D'Arcy
Patrick D'Arcy (1598–1668) was an Irish Catholic Confederate and lawyer who wrote the constitution of Confederate Ireland. Background Born in County Galway, Ireland, D'Arcy was the youngest son of James Riabhach D'Arcy by his second marriage, to Elizabeth Martyn. James Riabhach was formerly vice-president of Connacht, and Mayor of Galway upon his death in June 1603. By his first marriage, he fathered Nicholas, Martin, James, Anthony and Anastasia. With Elizabeth, he sired Andrew and Patrick. Elizabeth Martyn was a granddaughter of William Óge Martyn, and an aunt of Richard Martyn, who would later become Patrick's brother-in-law and law partner. The 17th-century historian Dubhaltach MacFhirbhisigh states that one of D'Arcy's ancestors, Walter Riabhach Ó Dorchaidhe (fl. c. 1488), was "the first man of the Uí Dorchaidhe who came to Galway, according to the Galweigians themselves". Ó Dorchaidhe was said to be a member of a lowly family descended from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sensory Memory
During every moment of an organism's life, sensory information is being taken in by sensory receptors and processed by the nervous system. Sensory information is stored in sensory memory just long enough to be transferred to short-term memory. Humans have five traditional senses: sight, hearing, taste, smell, touch. Sensory memory (SM) allows individuals to retain impressions of sensory information after the original stimulus has ceased. A common demonstration of SM is a child's ability to write letters and make circles by twirling a sparkler at night. When the sparkler is spun fast enough, it appears to leave a trail which forms a continuous image. This "light trail" is the image that is represented in the visual sensory store known as iconic memory. The other two types of SM that have been most extensively studied are echoic memory, and haptic memory; however, it is reasonable to assume that each physiological sense has a corresponding memory store. For example, children have be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Afterimage
An afterimage, or after-image, is an image that continues to appear in the eyes after a period of exposure to the original image. An afterimage may be a normal phenomenon (physiological afterimage) or may be pathological (palinopsia). Illusory palinopsia may be a pathological exaggeration of physiological afterimages. Afterimages occur because Photochemistry, photochemical activity in the retina continues even when the eyes are no longer experiencing the original stimulus. The remainder of this article refers to physiological afterimages. A common physiological afterimage is the dim area that seems to float before one's human eye, eyes after briefly looking into a light source, such as a camera flash. Palinopsia is a common symptom of visual snow. Negative afterimages Negative image, Negative afterimages are generated in the retina but may be modified like other retinal signals by neural adaptation of the retinal ganglion cells that carry signals from the retina of the eye to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
