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Super-pressure Balloon-borne Imaging Telescope (SuperBIT)
The Super-pressure Balloon-borne Imaging Telescope (SuperBIT) is a highly stabilized, high-resolution telescope that operates in the stratosphere via NASA's superpressure balloon (SPB) system. At 40 km altitude above sea level, the Gridiron football, football-stadium-sized balloon carries SuperBIT (at 3500 lbs) to a suborbital environment above 99.2% of the Atmosphere of Earth, Earth's atmosphere in order to obtain space-quality imaging. As a research instrument, SuperBIT's primary science goal is to provide insight into the distribution of dark matter in galaxy clusters and throughout the Large-scale structure of the Cosmos, large-scale structure of the universe. As demonstrated by numerous test flights, the survey data generated by SuperBIT is expected to have similar quality and data collection efficiency as the Hubble Space Telescope while complementing surveys from other up-and-coming observatories such as the James Webb Space Telescope (JWST), the Vera C. Rubin O ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Superbit Prelaunch 2019
Superbit was a brand of premium DVD-Video versions of Film, motion pictures from Sony Pictures Home Entertainment, a division of Sony Pictures Entertainment. Superbit DVDs aimed to improve picture quality over a standard DVD edition of a feature by increasing the bit rate of the encoded video. Audio quality was also improved by the mandatory inclusion of both Dolby Digital and Digital Theatre System, DTS 5.1 surround audio tracks. Technical details Superbit discs can be read by all regular DVD player, DVD video players, but their film files were encoded at a bit rate that is, according to Sony, approximately 1.5 times as high (6-7 Mbit/s vs 4-5 Mbit/s) as that of standard DVDs, which helps minimize compression artifact, artifacts caused by video compression and allow the image to be pre-filtered less prior to compression, which results in more detail. Superbit should not be confused with either Blu-ray or HD DVD discs, both of which are different media formats of much higher bit rate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Near Ultraviolet
Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights. Although long-wavelength ultraviolet is not considered an ionizing radiation because its photons lack the energy to ionize atoms, it can cause chemical reactions and causes many substances to glow or fluoresce. Consequently, the chemical and biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules. Short-wave ultraviolet light damages DNA and sterilizes surfaces with which it comes into contact. For hu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diurnal Cycle
A diurnal cycle (or diel cycle) is any pattern that recurs every 24 hours as a result of one full rotation of the planet Earth around its axis. Earth's rotation causes surface temperature fluctuations throughout the day and night, as well as weather changes throughout the year. The diurnal cycle depends mainly on incoming solar radiation. Climate and atmosphere In climatology, the diurnal cycle is one of the most basic forms of climate patterns, including variations in diurnal temperature and rainfall. Diurnal cycles may be approximately sinusoidal or include components of a truncated sinusoid (due to the Sun's rising and setting) and thermal relaxation ( Newton cooling) at night. The diurnal cycle also has a great impact on carbon dioxide levels in the atmosphere, due to processes such as photosynthesis and cellular respiration. Biological effects Diurnal cycles of light and temperature can result in similar cycles in biological processes, such as photosynthesis i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Level
Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datuma standardised geodetic datumthat is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location. Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. Current sea level rise is mainly caused by human-induced climate change. When temperatures rise, Glacier, mountain glaciers and the Ice sheet, polar ice caps melt, increasing the amount of water in water bodies. Because most of human settlem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wānaka
Wānaka () is a popular ski and summer resort town in the Otago region of the South Island of New Zealand. At the southern end of Lake Wānaka, it is at the start of the Clutha River/Mata-Au and is the gateway to Mount Aspiring National Park. Wānaka is primarily a resort town with both summer and winter seasons. Its economy is based on the many outdoor opportunities this offers. Historically, Māori visited the Wānaka area to hunt and fish in summer, or on their way to seek ''pounamu'' (greenstone) on the West Coast. Ngāi Tahu abandoned their seasonal camps after a raid by a North Island war party in 1836. The current town was founded as Pembroke during the gold rush of the 19th century, and renamed to Wanaka in 1940. Along with the rest of the Queenstown-Lakes District, Wānaka is growing rapidly, with the population increasing by 50% between 2005 and 2015. Names ''Wānaka'' is the South Island dialect pronunciation of , which means 'sacred knowledge or a place of learn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomical
Astronomy () is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond Earth's atmosphere. Cosmology is a branch of astronomy that studies the universe as a whole. Astronomy is one of the oldest natural sciences. The early civilizations in recorded history made methodical observations of the night sky. These include the Babylonians, Greeks, Indians, Egyptians, Chinese, Maya, and many ancient indigenous peoples of the Americas. In the past, astronomy included disciplines as diverse as astrometry, celestial navigation, observational astronomy, and the making of calendars. Nowadays, professiona ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Field Of View
The field of view (FoV) is the extent of the observable world that is seen at any given moment. In the case of optical instruments or sensors it is a solid angle through which a detector is sensitive to electromagnetic radiation. Humans and animals In the context of human and primate vision, the term "field of view" is typically only used in the sense of a restriction to what is visible by external apparatus, like when wearing spectacles or virtual reality goggles. Note that eye movements are allowed in the definition but do not change the field of view when understood this way. If the analogy of the eye's retina working as a sensor is drawn upon, the corresponding concept in human (and much of animal vision) is the visual field. It is defined as "the number of degrees of visual angle during stable fixation of the eyes".Strasburger, Hans; Pöppel, Ernst (2002). Visual Field. In G. Adelman & B.H. Smith (Eds): ''Encyclopedia of Neuroscience''; 3rd edition, on CD-ROM. El ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Centre Island, Toronto
The Toronto Islands are a chain of 15 small islands in Lake Ontario, south of mainland Toronto, Ontario, Canada. Comprising the only group of islands in the western part of Lake Ontario, the Toronto Islands are located just offshore from the city's downtown area, provide shelter for Toronto Harbour, and separate Toronto from the rest of Lake Ontario. The islands are home to the Toronto Island Park, the Billy Bishop Toronto City Airport, several private yacht clubs, a public marina, Centreville Amusement Park, a year-round residential neighbourhood, and several public beaches. The island community is the largest urban car-free community in North America. Public ferries operate year-round from Jack Layton Ferry Terminal, and privately operated water taxis operate from May to September. A pedestrian tunnel connects the mainland to the airport. The Toronto Islands are a popular tourist and recreational destination. Bicycles are accommodated on the ferries at no charge and can be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CN Tower
The CN Tower (french: Tour CN) is a concrete communications and observation tower in Toronto, Ontario, Canada. Completed in 1976, it is located in downtown Toronto, built on the former Railway Lands. Its name "CN" referred to Canadian National, the railway company that built the tower. Following the railway's decision to divest non-core freight railway assets prior to the company's privatization in 1995, it transferred the tower to the Canada Lands Company, a federal Crown corporation responsible for the government's real estate portfolio. The CN Tower held the record for the world's tallest free-standing structure for 32 years, from 1975 until 2007, when it was surpassed by the Burj Khalifa, and was the world's tallest tower until 2009 when it was surpassed by the Canton Tower. It is currently the tenth-tallest free-standing structure in the world and remains the tallest free-standing structure on land in the Western Hemisphere. In 1995, the CN Tower was declared ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Steadicam
Steadicam is a brand of camera stabilizer mounts for Movie camera, motion picture cameras invented by Garrett Brown and introduced in 1975 by Cinema Products Corporation. It was designed to isolate the camera from the camera operator's movement, keeping the camera motion separate and controllable by a skilled operator. History Before the camera stabilizing system, a director had a number of choices for moving (or "Tracking shot, tracking") shots: # The camera could be mounted on a camera dolly, dolly, a wheeled mount that rolls on specialized tracks or a smooth surface. # The camera could be mounted on a Crane shot, crane, a counterweighted arm that could move the camera vertically and horizontally. # The camera operator shoot Hand-held camera, hand-held which would produce footage suitable mostly for documentaries, news, reportage, live action, unrehearsed footage, or the evocation of authentic immediacy or ''cinéma vérité'' during dramatic sequences. While these cinemati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Degrees Of Freedom (mechanics)
In physics, the degrees of freedom (DOF) of a mechanical system is the number of independent parameters that define its configuration or state. It is important in the analysis of systems of bodies in mechanical engineering, structural engineering, aerospace engineering, robotics, and other fields. The position of a single railcar (engine) moving along a track has one degree of freedom because the position of the car is defined by the distance along the track. A train of rigid cars connected by hinges to an engine still has only one degree of freedom because the positions of the cars behind the engine are constrained by the shape of the track. An automobile with highly stiff suspension can be considered to be a rigid body traveling on a plane (a flat, two-dimensional space). This body has three independent degrees of freedom consisting of two components of translation and one angle of rotation. Skidding or drifting is a good example of an automobile's three independent degrees ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minute And Second Of Arc
A minute of arc, arcminute (arcmin), arc minute, or minute arc, denoted by the symbol , is a unit of angular measurement equal to of one degree. Since one degree is of a turn (or complete rotation), one minute of arc is of a turn. The nautical mile (nmi) was originally defined as the arc length of a minute of latitude on a spherical Earth, so the actual Earth circumference is very near . A minute of arc is of a radian. A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol , is of an arcminute, of a degree, of a turn, and (about ) of a radian. These units originated in Babylonian astronomy as sexagesimal subdivisions of the degree; they are used in fields that involve very small angles, such as astronomy, optometry, ophthalmology, optics, navigation, land surveying, and marksmanship. To express even smaller angles, standard SI prefixes can be employed; the milliarcsecond (mas) and microarcsecond (μas), for instance, are commonly used in astr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
