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Riser
Riser may refer to: Engineering * Stair riser, the vertical elements in a set of stairs * Riser, another name for a theatre platform * Riser, a length of vertically oriented piping used to deliver fluid, gas, or electrical signals or power upward ** Drilling riser, a device used on a ship or offshore drilling rig ** Dry riser, a pipe used to deliver water to firefighting systems that is normally kept empty (dry) ** Riser cable, a type of communications cable used to connect multiple floors in a building * Riser card, a printed circuit board which extends connectors away from another board * Riser, a skateboard component which increases the space between the wheels and the deck * Riser, the center section of a recurve bow * Parachute riser, strip of webbing joining the harness to the rigging lines * Riser (casting), a reservoir in a manufacturing mold People * Larkin T. Riser (born 1949), Louisiana sheriff * Matt Riser (born 1984), American college baseball coach * Neil Ri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riser (casting)
A riser, also known as a feeder, is a reservoir built into a metal casting mold to prevent cavities due to shrinkage. Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify. Risers prevent this by providing molten metal to the casting as it solidifies, so that the cavity forms in the riser and not the casting.. Risers are not effective on materials that have a large freezing range, because directional solidification is not possible. They are also not needed for casting processes that utilized pressure to fill the mold cavity. Theory Risers are only effective if three conditions are met: the riser cools after the casting, the riser has enough material to compensate for the casting shrinkage, and the casting directionally solidifies towards the riser. For the riser to cool after the casting the riser must cool more slowly than the casting. Chvorinov's rule briefly states that the slowest cooling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stair Riser
Stairs are a structure designed to bridge a large vertical distance between lower and higher levels by dividing it into smaller vertical distances. This is achieved as a diagonal series of horizontal platforms called steps which enable passage to the other level by stepping from one to another step in turn. Steps are very typically rectangular. Stairs may be straight, round, or may consist of two or more straight pieces connected at angles. Types of stairs include staircases (also called stairways), ladders, and escalators. Some alternatives to stairs are elevators (also called lifts), stairlifts, inclined moving walkways, and ramps. A stairwell is a vertical shaft or opening that contains a staircase. A flight (of stairs) is an inclined part of a staircase consisting of steps (and their lateral supports if supports are separate from steps). Components and terms A ''stair'', or a ''stairstep'', is one step in a flight of stairs.R.E. Putnam and G.E. Carlson, ''Architectural a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drilling Riser
A drilling riser is a conduit that provides a temporary extension of a subsea oil well to a surface drilling facility. Drilling risers are categorised into two types: marine drilling risers used with subsea blowout preventer (BOP) and generally used by floating drilling vessels; and tie-back drilling risers used with a surface BOP and generally deployed from fixed platforms or very stable floating platforms like a spar or tension leg platform (TLP). Marine drilling riser A marine drilling riser has a large diameter, low pressure main tube with external auxiliary lines that include high pressure choke and kill lines for circulating fluids to the subsea blowout preventer (BOP), and usually power and control lines for the BOP. The design and operation of marine drilling risers is complex, and the requirement for high reliability means an extensive amount of engineering analysis is required. When used in water depths greater than about 20 meters, the marine drilling riser has to be t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riser Card
A Riser Card is a printed circuit board that gives a computer motherboard the option for additional expansion cards to be added to the computer. Usage Risers is usually connected to the mainboard's slot through an edge connector, though some, such as NLX and Next Unit of Computing Extreme, have the edge connector on the mainboard instead and have the mainboard plug into Risers. In general, the main purpose is to change the orientation of the expansion cards such that they fit a limited space within casing. Riser Cables Riser Cables is an evolution of Riser Cards that utilized improved specifications (specifically the use of PCI Express) and better materials, which allows further distances of data transmission and orientation flexibility than traditional riser cards. These cables used a Riser Card PCB and an edge connector on each side of the cable, with a copper alloy surrounded by a plastic insulator that allows for the further data transmission distances. These cables are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riser (album)
''Riser'' (stylized as ''RISER'') is the seventh studio album by American country music singer Dierks Bentley. It was released on February 25, 2014, by Capitol Nashville, and debuted at number 6 on the ''Billboard'' 200, becoming his seventh top ten album. The album was nominated for Best Country Album at the 57th Annual Grammy Awards. Content The album includes the singles "Bourbon in Kentucky", " I Hold On", " Drunk on a Plane", " Say You Do". and the title track Riser. The first single peaked at number 45 on the Country Airplay chart, becoming Bentley's lowest-charting single to date at the time. The album was originally scheduled to be released in late 2013. The label decided to postpone the album's release date, and quickly began promoting the album's second single "I Hold On", which reached number 1 on Country Airplay. "Drunk on a Plane", the album's third single, became one of the biggest hits of his career, peaking at number 27 on the ''Billboard'' Hot 100. "Say Yo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riser Cable
__NOTOC__ Plenum cable is electrical cable that is laid in the plenum spaces of buildings. In the United States, plastics used in the construction of plenum cable are regulated under the National Fire Protection Association standard NFPA 90A: Standard for the Installation of Air Conditioning and Ventilating Systems. All materials intended for use on wire and cables to be placed in plenum spaces are designed to meet rigorous fire safety test standards in accordance with NFPA 262 and outlined in NFPA 90A. Plenum cable is jacketed with a fire-retardant plastic jacket of either a low-smoke polyvinyl chloride (PVC) or a fluorinated ethylene polymer ( FEP). Polyolefin formulations, specifically based on polyethylene compounding had been developed by at least two companies in the early to mid-1990s; however, these were never commercialized, and development efforts continue in these yet-untapped product potentials. Development efforts on a non-halogen plenum compound were announced in 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Recurve Bow
In archery, a recurve bow is one of the main shapes a bow can take, with limbs that curve away from the archer when unstrung. A recurve bow stores more energy and delivers energy more efficiently than the equivalent straight-limbed bow, giving a greater amount of energy and speed to the arrow. A recurve will permit a shorter bow than the simple straight limb bow for given arrow energy, and this form was often preferred by archers in environments where long weapons could be cumbersome, such as in brush and forest terrain, or while on horseback. Recurved limbs also put greater stress on the materials used to make the bow, and they may make more noise with the shot. Extreme recurves make the bow unstable when being strung. An unstrung recurve bow can have a confusing shape and many Native American weapons, when separated from their original owners and cultures, were incorrectly strung backwards and destroyed when attempts were made to shoot them. A test performed by Hepworth and S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parachute
A parachute is a device used to slow the motion of an object through an atmosphere by creating drag or, in a ram-air parachute, aerodynamic lift. A major application is to support people, for recreation or as a safety device for aviators, who can exit from an aircraft at height and descend safely to earth. A parachute is usually made of a light, strong fabric. Early parachutes were made of silk. The most common fabric today is nylon. A parachute's canopy is typically dome-shaped, but some are rectangles, inverted domes, and other shapes. A variety of loads are attached to parachutes, including people, food, equipment, space capsules, and bombs. History Middle Ages In 852, in Córdoba, Spain, the Moorish man Armen Firman attempted unsuccessfully to fly by jumping from a tower while wearing a large cloak. It was recorded that "there was enough air in the folds of his cloak to prevent great injury when he reached the ground." Early Renaissance The earliest evidence f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terrace (geology)
In geology, a terrace is a step-like landform. A terrace consists of a flat or gently sloping geomorphic surface, called a tread, that is typically bounded on one side by a steeper ascending slope, which is called a "riser" or "scarp". The tread and the steeper descending slope (riser or scarp) together constitute the terrace. Terraces can also consist of a tread bounded on all sides by a descending riser or scarp. A narrow terrace is often called a bench.Howard, A.D., R.W. Fairbridge, J.H. Quinn, 1968, "Terraces, Fluvial—Introduction", in R.W. Fairbridge, ed., ''The Encyclopedia of Geomorphology: Encyclopedia of Earth Science Series'', vol. 3. Reinhold Book Corporation. New York, New York.Jackson, J.A., 1997, ''Glossary of Geology''. American Geological Institute. Alexandria, Virginia. The sediments underlying the tread and riser of a terrace are also commonly, but incorrectly, called terraces, leading to confusion. Terraces are formed in various ways. Fluvial terraces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dry Riser
In North America, a standpipe is a type of rigid water piping which is built into multi-story buildings in a vertical position, or into bridges in a horizontal position, to which fire hoses can be connected, allowing manual application of water to the fire. Within the context of a building or bridge, a standpipe serves the same purpose as a fire hydrant. In many other countries, hydrants in streets are below ground level. Fire trucks carry standpipes and key, and there are bars on the truck. The bar is used to lift a cover in the road, exposing the hydrant. The standpipe is then "sunk" into the hydrant, and the hose is connected to the exposed ends of the standpipe. The bar is then combined with the key, and is used to turn the hydrant on and off. Dry standpipe When standpipes are fixed into buildings, the pipe is in place permanently with an intake usually located near a road or driveway, so that a fire engine can supply water to the system. The standpipe extends into the bu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neil Riser
Hartwell Neil Riser Jr. (born April 25, 1962) is an American politician. He served as a Republican member for the 32nd district of the Louisiana State Senate. Riser is currently a member of the Louisiana House of Representatives. Riser was born in Columbia, Louisiana. He attended the University of Louisiana at Monroe, where he earned a bachelor's degree in 1984. In 2007 Riser was elected for the 32nd district of the Louisiana State Senate. In 2017 Riser ran for Louisiana State Treasurer. In 2020, he was succeeded by Glen Womack for the 32nd district of the Louisiana State Senate. In the same year, Riser was elected for the 20th district of the Louisiana House of Representatives The Louisiana House of Representatives (french: link=no, Chambre des Représentants de Louisiane) is the lower house in the Louisiana State Legislature, the state legislature of the U.S. state of Louisiana. This chamber is composed of 105 repr .... Riser assumed office on January 13, 2020. Ref ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theatre Platform
In theatre, a platform (also referred to as a riser or rostrum) is a stationary, standard flat walking surface for actors to perform on. Typically, they are built to be assembled modularly. They are often used to provide varying levels, to make a show more visually interesting. They are also used to separate areas on stage, and as seating bleachers. This is in contrast to scenery wagons, which are mobile platforms that are supported by casters instead of feet. Construction Platforms are composed of a frame, a lid, and legs. Lids Lids are typically made from a sheet of plywood, although oriented strand board is also sometimes used. Sometimes another layer is added on top of the plywood. Hardboard is sometimes used as an easily replaceable and sturdy cover. Homasote is sometimes used because it is quiet and more comfortable to walk on. Occasionally, a layer of muslin is added on top of these materials, as it takes paint better than other options. Framing Framing is most commonly m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
