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Shear (other)
Shear may refer to: Textile production *Animal shearing, the collection of wool from various species **Sheep shearing *The removal of Nap (textile), nap during wool cloth production *Scissors, a hand-operated cutting equipment Science and technology Engineering *Shear strength (soil), the shear strength of soil under loading *Shear line (locksmithing), where the inner cylinder ends and the outer cylinder begins in a cylinder lock *Shearing (manufacturing), a metalworking process which cuts stock without the formation of chips or the use of burning or melting *Shear (sheet metal), various tools to shear sheet metal *Board shear, in bookbinding, a tool to cut board or paper *Shear pin, in machinery, such as a plough, designed to shear (break) when a certain force is exceeded, to protect other components of the machine. *Shearing interferometer, in optics, a simple and very common means to check the collimation of beams by observing interference *Shearing in computer graphics, more c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal Shearing
Wool is the textile fibre obtained from sheep and other mammals, especially goats, rabbits, and camelids. The term may also refer to inorganic materials, such as mineral wool and glass wool, that have properties similar to animal wool. As an animal fibre, wool consists of protein together with a small percentage of lipids. This makes it chemically quite distinct from cotton and other plant fibres, which are mainly cellulose. Characteristics Wool is produced by follicles which are small cells located in the skin. These follicles are located in the upper layer of the skin called the epidermis and push down into the second skin layer called the dermis as the wool fibers grow. Follicles can be classed as either primary or secondary follicles. Primary follicles produce three types of fiber: kemp, medullated fibers, and true wool fibers. Secondary follicles only produce true wool fibers. Medullated fibers share nearly identical characteristics to hair and are long but lack crimp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shear Matrix
In mathematics, a shear matrix or transvection is an elementary matrix that represents the addition of a multiple of one row or column to another. Such a matrix may be derived by taking the identity matrix and replacing one of the zero elements with a non-zero value. The name ''shear'' reflects the fact that the matrix represents a shear transformation. Geometrically, such a transformation takes pairs of points in a vector space that are purely axially separated along the axis whose row in the matrix contains the shear element, and effectively replaces those pairs by pairs whose separation is no longer purely axial but has two vector components. Thus, the shear axis is always an eigenvector of ''S''. Definition A typical shear matrix is of the form S = \begin 1 & 0 & 0 & \lambda & 0 \\ 0 & 1 & 0 & 0 & 0 \\ 0 & 0 & 1 & 0 & 0 \\ 0 & 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 0 & 1 \end. This matrix shears parallel to the ''x'' axis in the direction of the fourth dimension of the underlying vecto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shears (other)
Shears may refer to: Cutting devices * Scissors, also called shears * Hair-cutting shears * Blade shears, typically used for shearing animals * Grass shears, for lawn trimming * Kitchen shears, scissors used in the kitchen for food preparation * Pinking shears, scissors where the blades are sawtoothed instead of straight; they leave a zigzag pattern instead of a straight edge * Pruning shears, for cutting branches and stems * Snips, for cutting metal * Trauma shears, scissors used by emergency medical personnel to cut clothing People * Albert Shears (born 1900), English footballer * Augustus Shears (1827–1911), English clergyman * Curtis Shears (1901–1988), American Olympic fencer * Ernest Shears (1849–1917), Anglican clergyman in South Africa * George Shears (1890–1978), Major League Baseball pitcher * Jake Shears (born 1978), lead vocalist for the American music group Scissor Sisters * Philip James Shears (1887–1972), British Army officer * Stevie Shears (born c. 1950) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shear (comics)
Shear (Walther Feyzioglu) is a fictional character, a Marvel Comics superhero (but not in the Marvel Universe), member of the Strikeforce: Morituri (a series in its own mostly self-contained continuity). The character was created by Peter B. Gillis and Brent Anderson. Publication history Shear was created by writer Peter B. Gillis and artist Brent Anderson and debuted in ''Strikeforce: Morituri'' #13 (December 1987). Shear remained in the regular cast of the book until his death in ''Strikeforce: Morituri'' #25. Fictional character biography Walther Feyzioglu was born in Germany, the son of Turkish immigrants. He grew to become an aggressive young man, partially because of the racism his family faced. In 2073, he was working in a factory in İzmir, Turkey, when he applied to participate in the Morituri program, a scientific program which grants superhuman abilities to its recipients, to be used as Earth's soldiers in its ongoing war against the invading alien race known as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shearing (surname)
Shearing is a surname. Notable people with the surname include: *Dinah Shearing (1928–2021), Australian actress *George Shearing (1919–2011), British jazz pianist * Miriam Shearing (born 1935), American lawyer and judge *Peter Shearing Peter Fraser Shearing (born 26 August 1938) is an English former professional association football, footballer who played as a goalkeeper (association football), goalkeeper. He played professionally for West Ham United F.C., West Ham United, Port ... (born 1938), English footballer See also * Sherring {{surname, Shearing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shear (surname)
Shear is a surname. Notable people with the surname include: *Barry Shear (1923–1979), American film director and producer *Byron D. Shear (1869–1929), American politician *Claudia Shear (born 1962), American actress and playwright *Cornelius Lott Shear (1865–1956), American mycologist and plant pathologist * David B. Shear (born 1954), American diplomat * Harold E. Shear (1918–1999), American Navy admiral *Joe Shear (1943–1998), American race car driver *Jules Shear (born 1952), American singer-songwriter * Linda Shear (born 1948), American musician * Marie Shear (1940–2017), American writer and activist * Matthew Shear (born 1984), American actor *Michael D. Shear, American journalist *Rhonda Shear (born 1954), American entertainer and entrepreneur *Tom Shear Tom Shear is an American musician and music producer, and is the sole member of the electronic act Assemblage 23. He was born on November 12, 1971 in State College, Pennsylvania, where he lived until he was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wind Shear
Wind shear (or windshear), sometimes referred to as wind gradient, is a difference in wind speed and/or direction over a relatively short distance in the atmosphere. Atmospheric wind shear is normally described as either vertical or horizontal wind shear. Vertical wind shear is a change in wind speed or direction with a change in altitude. Horizontal wind shear is a change in wind speed with a change in lateral position for a given altitude. Wind shear is a microscale meteorological phenomenon occurring over a very small distance, but it can be associated with mesoscale or synoptic scale weather features such as squall lines and cold fronts. It is commonly observed near microbursts and downbursts caused by thunderstorms, fronts, areas of locally higher low-level winds referred to as low-level jets, near mountains, radiation inversions that occur due to clear skies and calm winds, buildings, wind turbines, and sailboats. Wind shear has significant effects on the control of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shear Line (meteorology)
Surface weather analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground-based weather stations. Weather maps are created by plotting or tracing the values of relevant quantities such as sea level pressure, temperature, and cloud cover onto a geographical map to help find synoptic scale features such as weather fronts. The first weather maps in the 19th century were drawn well after the fact to help devise a theory on storm systems.Eric R. MillerAmerican Pioneers in Meteorology.Retrieved on 2007-04-18. After the advent of the telegraph, simultaneous surface weather observations became possible for the first time, and beginning in the late 1840s, the Smithsonian Institution became the first organization to draw real-time surface analyses. Use of surface analyses began first in the United States, spreading worldwide during the 1870s. Use of the Norwegian cyclone model for fronta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shear Rate
In physics, shear rate is the rate at which a progressive shearing deformation is applied to some material. Simple shear The shear rate for a fluid flowing between two parallel plates, one moving at a constant speed and the other one stationary (Couette flow), is defined by :\dot\gamma = \frac, where: *\dot\gamma is the shear rate, measured in reciprocal seconds; * is the velocity of the moving plate, measured in meters per second; * is the distance between the two parallel plates, measured in meters. Or: : \dot\gamma_ = \frac + \frac. For the simple shear case, it is just a gradient of velocity in a flowing material. The SI unit of measurement for shear rate is s−1, expressed as "reciprocal seconds" or "inverse seconds". The shear rate at the inner wall of a Newtonian fluid flowing within a pipe is :\dot\gamma = \frac, where: *\dot\gamma is the shear rate, measured in reciprocal seconds; * is the linear fluid velocity; * is the inside diameter of the pipe. The lin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shear (fluid)
Shear stress, often denoted by (Greek: tau), is the component of stress coplanar with a material cross section. It arises from the shear force, the component of force vector parallel to the material cross section. ''Normal stress'', on the other hand, arises from the force vector component perpendicular to the material cross section on which it acts. General shear stress The formula to calculate average shear stress is force per unit area.: : \tau = , where: : = the shear stress; : = the force applied; : = the cross-sectional area of material with area parallel to the applied force vector. Other forms Wall shear stress Wall shear stress expresses the retarding force (per unit area) from a wall in the layers of a fluid flowing next to the wall. It is defined as: \tau_w:=\mu\left(\frac\right)_ Where \mu is the dynamic viscosity, u the flow velocity and y the distance from the wall. It is used, for example, in the description of arterial blood flow in which case which there ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Simple Shear
Simple shear is a deformation in which parallel planes in a material remain parallel and maintain a constant distance, while translating relative to each other. In fluid mechanics In fluid mechanics, simple shear is a special case of deformation where only one component of velocity vectors has a non-zero value: :V_x=f(x,y) :V_y=V_z=0 And the gradient of velocity is constant and perpendicular to the velocity itself: :\frac = \dot \gamma , where \dot \gamma is the shear rate and: :\frac = \frac = 0 The displacement gradient tensor Γ for this deformation has only one nonzero term: :\Gamma = \begin 0 & & 0 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \end Simple shear with the rate \dot \gamma is the combination of pure shear strain with the rate of \dot \gamma and rotation with the rate of \dot \gamma: :\Gamma = \begin \underbrace \begin 0 & & 0 \\ 0 & 0 & 0 \\ 0 & 0 & 0 \end \\ \mbox\end = \begin \underbrace \begin 0 & & 0 \\ & 0 & 0 \\ 0 & 0 & 0 \end \\ \mbox \end + \begi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shear Strength
In engineering, shear strength is the strength of a material or component against the type of yield or structural failure when the material or component fails in shear. A shear load is a force that tends to produce a sliding failure on a material along a plane that is parallel to the direction of the force. When a paper is cut with scissors, the paper fails in shear. In structural and mechanical engineering, the shear strength of a component is important for designing the dimensions and materials to be used for the manufacture or construction of the component (e.g. beams, plates, or bolts). In a reinforced concrete beam, the main purpose of reinforcing bar (rebar) stirrups is to increase the shear strength. Equations For shear stress \tau applies :\tau = \frac , where :\sigma_1 is major principal stress and :\sigma_3 is minor principal stress. In general: ductile materials (e.g. aluminum) fail in shear, whereas brittle materials (e.g. cast iron) fail in tension. See ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
