Earth s rotation and lengthening the day by about 2 ms every one hundred years. Tidalacceleration is an effect of the tidal force s between an orbiting natural satellite e.g. the Moon , and the primary planet that it orbits e.g. the Earth . The acceleration is usually negative, as it causes ... acceleration, earth retardation and tidal friction at pages 144 146. ref The question depended ... will evolve into a red giant and likely destroy both the Earth and Moon. Tidalacceleration is one ... distant gravitational perturbations, friction is an essential part of tidalacceleration, and leads ... A , pp.165 202. doi 10.1098 rsta.1995.0028 ref The other consequence of tidalacceleration is the deceleration .... Other cases of tidalacceleration Most natural satellites of the planets undergo tidalacceleration ... of Washington Professor Toby Smith DEFAULTSORT TidalAcceleration Category Tides Category Geodesy ... slowdown of the primary s rotation. The process eventually leads to tidal locking of first ... process of tidal deceleration occurs for satellites that have an orbital period that is shorter than ... history of the secular acceleration Edmond Halley was the first to suggest, in 1695, ref E Halley ... as a positive acceleration. In 1749 Richard Dunthorne confirmed Halley s suspicion after re examining ... of the Wood Wardian Museum at Cambridge, concerning the Acceleration of the Moon , Philosophical ... for 1744 49 , p669 675 as On the Acceleration of the Moon, by the Rev. Richard Dunthorne . ref a centurial ... P Puiseux 1879 , http archive.numdam.org article ASENS 1879 2 8 361 0.pdf Sur l acceleration seculaire ... s apparent acceleration could be accounted for on Laplace s basis by the change in the Earth ... independently in the 1860s by Delaunay and by William Ferrel tidal retardation of the Earth s rotation rate was lengthening the unit of time and causing a lunar acceleration that was only apparent. It took some time for the astronomical community to accept the reality and the scale of tidal effects ... more details
In relativity theory, proper acceleration ref Edwin F. Taylor & John Archibald Wheeler 1966 1st ed. only ... acceleration i.e., measurable acceleration as by an accelerometer experienced by an object. It is acceleration relative to a free fall , or inertial, observer who is momentarily at rest relative to the object being measured. This contrasts with coordinate acceleration, which is dependent on choice ... of special relativity, for unidirectional motion, proper acceleration is the rate of change of proper velocity with respect to coordinate time. The proper acceleration 3 vector, combined with a null time component, yields the object s four acceleration , which makes proper acceleration s magnitude ... in a rocket standing at the gantry, the proper acceleration is the acceleration felt by the occupants, and which is described as g force which is not a force but rather an acceleration see that article for more discussion of proper acceleration . ref Relativity By Wolfgang Rindler pg 71 ref The acceleration of gravity force of gravity never contributes to proper acceleration in any circumstances, and thus the proper acceleration felt by observers standing on the ground is due to the mechanical force from the ground , not due to the force or acceleration of gravity. If the ground is removed and the observer allowed to free fall, the observer will experience coordinate acceleration, but no proper acceleration, and thus no g force. Generally, objects in such a fall or generally any such ballistic path also called inertial motion , including objects in orbit, experience no proper acceleration neglecting small tidal accelerations for inertial paths in gravitational fields . This state ... . Proper acceleration reduces to coordinate acceleration in an inertial coordinate system in flat ... less than the speed of light c . Only in such situations is coordinate acceleration entirely felt as a g force i.e., a proper acceleration, also defined as one that produces measurable weight . In situations ... more details
extent, the Sun . Tidal forces are also responsible for tidal locking and tidalacceleration . Mathematical treatment For a given externally generated gravitational field, the tidalacceleration at a point ..., the term tidal force is used to describe the forces due to tidalacceleration. Note that for these purposes ... is subtracted this is the tidal force. See Figure 2 for a more exact version Tidalacceleration ... tidalacceleration. By Newton s law of universal gravitation and laws of motion, a body of mass m a distance ... the difference mentioned above and are tidal force acceleration terms. Where r , is small compared to R , the first of the tidalacceleration terms is usually much more significant than the others, giving for the tidalacceleration math vec a t math axial for the distances r considered, along the axis ... a Euclidean vector vector calculation. In the plane perpendicular to that axis, the tidalacceleration ... of planets in the Solar System are generally very small. For example, the lunar tidalacceleration ... books.google.com books?id GCgXCxG4VLcC&pg PA277 Chapter 11, p. 277 ref The solar tidalacceleration ... resonance Roche limit Tidal locking Tidalacceleration Galactic tide References reflist External ...Image Shoemaker levy tidal forces.jpg thumbnail 300px Figure 1 Comet Shoemaker Levy 9 in 1994 after breaking up under the influence of Jupiter s tidal forces during a previous pass in 1992. The tidal force .... Stated differently, the tidal force is a differential force. Consider three things being pulled by the moon ... general usage in celestial mechanics , the expression tidal force can refer to a situation in which a body or material for example, tidal water, or the Moon is mainly under the gravitational influence ... of a third body for example, by the Moon in the case of tidal water, or by the Sun in the case of the Moon . The perturbing force is sometimes in such cases called a tidal force ref http adsabs.harvard.edu full 1977SvAL....3...96A On the tidal force , I N Avsiuk, in Soviet Astronomy Letters , vol.3 ... more details
Tidal heating also known as tidal working occurs through the tidal friction processes orbital and rotational energy are dissipated as heat in the crust of the moons and planets involved. Io moon Io , a moon of Jupiter , is the most volcanically active body in the solar system , with no impact craters surviving on its surface. This is because the tidal force of Jupiter deforms Io ref Citation title Melting of Io by Tidal Dissipation url http links.jstor.org sici?sici 0036 8075 2819790302 293 3A203 3A4383 3C892 3AMOIBTD 3E2.0.CO 3B2 8 year 1979 journal Science pages 892 894 volume 203 issue 4383 last1 Peale first1 S. J. last2 Cassen first2 P. last3 Reynolds first3 R. T. accessdate 2010 10 12 ref the orbital eccentricity eccentricity of Io s orbit a consequence of its participation in a Orbital resonance Laplace resonance causes the height of Io s tidal bulge to vary significantly by up to 100 m over the course of an orbit the friction from this tidal flexing then heats up its interior. A similar but weaker process is theorised to have melted the lower layers of the ice surrounding the rocky mantle of Jupiter s next large moon, Europa moon Europa . Saturn s moon Enceladus moon Enceladus is similarly thought to have a liquid water ocean beneath its icy crust. The cryovolcano water vapor geysers which eject material from Enceladus are thought to be powered by friction generated within this moon s shifting ice crust. References Reflist See also tidalacceleration Category Planetary science Category Tides Geophysics stub Planetary science stub zh ... more details
chapter 4 isbn 978 0 521 66624 4 ref A tidal generator converts the energy of tidal flows into electricity. Greater tidal variation and higher tidal current velocities can dramatically increase the potential of a site for tidal electricity generation. Because the Earth s tides are ultimately due to gravitational interaction with the Moon and Sun and the Earth s rotation, tidal power is practically inexhaustible and classified as a renewable energy resource. Movement of tides causes a tidalacceleration ...Renewable energy sources Tidal power , also called tidal energy , is a form of hydropower that converts ..., tidal power has potential for future electricity generation . Tides are more predictable than wind energy and solar power . Among sources of renewable energy , tidal power has traditionally suffered from relatively high cost and limited availability of sites with sufficiently high tidal ranges or flow ... and improvements, both in design e.g. Dynamic tidal power dynamic tidal power , Tidal barrage Tidal lagoon power tidal lagoons and turbine technology e.g. new Tidal stream generator Axial turbines axial turbines , Tidal stream generator Vertical and horizontal axis crossflow turbines cross flow turbines , indicate that the total availability of tidal power may be much higher than previously ... tidal power plant the Rance Tidal Power Station became operational in 1966. Generation of tidal energy File Tide type.gif thumb 250px right Variation of tides over a day Main Tide TidalaccelerationTidal power is extracted from the Earth s oceanic tides tidal forces are periodic variations in gravitational ... bathymetry geography of the sea floor and coastlines . Tidal power is the only technology that draws ... energy. While tidal power may take additional energy from the system, the effect is negligible ... thumb The world s first commercial scale and grid connected tidal stream generator SeaGen in Strangford ... in the tidal current. File DTP T dam top down view.jpg thumb right Top down view of a DTP dam. Blue ... more details
× gravitational acceleration × tidal range squared × 9 × 10 sup 6 sup m sup 2 sup ...File Rance tidal power plant.JPG thumb The Rance Tidal Power Station , a tidal barrage in France. A tidal ... of a bay or river due to tides tidal forces. ref name esru cite web title Tidal barrage url http www.esru.strath.ac.uk EandE Web sites 01 02 RE info Tidal 20Power.htm barrage accessdate 2 November 2010 ref ref name rise cite web title Tidal barrages and tidal turbines url http www.rise.org.au info Tech tidal index.html accessdate 2 November 2010 ref Instead of damming water on one side like a conventional dam , a tidal barrage first allows water to flow into a bay or river during high tide , and releasing the water back during low tide . This is done by measuring the tidal flow and controlling the sluice gate s at key times of the tidal cycle. Turbines are then placed at these sluices to capture the energy as the water flows in and out. ref name esru Tidal barrages are among the oldest methods of tidal power generation, with projects being developed as early as the 1960s, such as the nowrap 1.7 megawatt Kislaya Guba Tidal Power Station in Kislaya Guba , Russia . Generating methods File Tidal power conceptual barrage.jpg thumb An artistic impression of a tidal barrage, including embankments ... tidal energy involves building a barrage across a bay or river that is subject to tidal flow. Turbines ... where it is not sealed by caissons. The sluice gates applicable to tidal power are the flap gate ... Tidal Power Station , on the Rance river Rance river , in France, which has been operating since 1966, and generates 240MW. A larger 254MW plant began operation at Sihwa Lake Tidal Power ... a tiny inlet in Kislaya Guba Tidal Power Station Kislaya Guba , Russia . A number of proposals ... generation occurs as the tide changes tidal direction. Flood generation The basin is filled through ... between the potential energy is not a linear relationship, but rather, is related by the square of the tidal ... more details
File Hawaii 1998 0p2s 2p50.png thumb 350px Ground motion hazard map for Hawaii , based on a 2 probability of exceeding 0.2 second spectral acceleration at 5 Hz in 50 years Spectral acceleration SA is a unit measured in g the acceleration due to Earth s gravity , equivalent to g force that describes the maximum acceleration in an earthquake on an object &ndash specifically a damped, harmonic oscillator moving in one physical dimension . This can be measured at or specified for different oscillation Frequency frequencies and with different degrees of damping , although 5 damping is commonly applied. ref name opensha http www.opensha.org glossary intensityMeasureType SA Intensity Measure Type IMT OpenSHA, accessed 2011 04 14 ref The SA at different frequencies may be plotted to form a response spectrum . Spectral acceleration, with a value related to the Mechanical resonance natural frequency of vibration of the building, is used in earthquake engineering and gives a closer approximation to the motion of a building or other structure in an earthquake than the peak ground acceleration value, ref name usgs sa http earthquake.usgs.gov learn faq ?faqID 221 FAQs What is spectral acceleration or SA? United States Geological Survey , accessed 2011 04 14 ref ref name opensha although there is normally a Correlation and dependence correlation between SA and PGA. ref name usgs sa Some seismic hazard maps are also produced using spectral acceleration. See also Peak ground acceleration Seismic scale External links http www.consrv.ca.gov cgs rghm psha Pages sa 01.aspx Spectral Acceleration Hazard Map of California http earthquakescanada.nrcan.gc.ca hazard alea zoning NBCC2005maps eng.php 2005 National Building Code of Canada Spectral Acceleration Hazard Maps http kula.geol.wwu.edu rjmitch pga maps.pdf What is a ground shaking hazard map? Includes explanations of SA and PGA References reflist geophysics stub Category Seismology Category Earthquake engineering ... more details
Channel. Such extreme tidal ranges 13 m are almost certainly due to a resonant tidal wave trapped between the coast and the edge of the continental shelf. In oceanography , a tidal resonance ... last Platzman first G.W. year 1991 contribution Tidal Evidence for Ocean Normal Modes editor last Parker editor first B.P. title Tidal Hydrodynamics publication place New York publisher John Wiley & Sons ... wide. Then an incident tidal wave can be reinforced by reflections between the coast and the shelf edge, the result producing a much higher tidal range at the coast. Famous examples of this effect are found ... is the acceleration of gravity and h is the depth of the ocean ref name Segar07 Cite book last Segar ... m, the speed is approximately 30 m s. So if the tidal period is 12 hours, a quarter wavelength ... less effect at tidal frequencies. However the effect is still enough to partly explain why ... ocean. The strong tidal currents associated with resonances also mean that the resonant regions are the areas where most tidal energy is dissipated. In the deep ocean, where the depth is typically ... from resonance this can stop tidal energy moving onto the shelf. However near a resonant frequency ... energy onto the shelf. The increased speed of long waves in the deep ocean means that the tidal ... 2.0.CO 2 ref . ref name Webb73 Cite journal last Webb first D.J. title Tidal Resonance in the Coral ... the deep ocean loses tidal energy too rapidly to the resonant shelves. Tidal locking The above concept of tidal resonance differs from another sort of resonance resulting from tides, called tidal ... physical oceanography DEFAULTSORT Tidal Resonance Category Physical oceanography Category Tides ... more details
orphan date August 2010 Cloud acceleration is one form of delivering web content and applications as quickly as possible. Cloud acceleration is similar to a content delivery network , or CDN, in that it attempts to get content to users as quickly as possible. While CDNs rely on Edge computing edge caching , cloud acceleration optimizes the delivery path and routes content through public or private, managed networks ref Cloud Computing Journal, Next Generation Content Delivery Cloud Acceleration, By Jonathan Hoppe Jul. 22, 2010 http cloudcomputing.sys con.com node 1471257 ref . References See Wikipedia Footnotes on how to create references using ref ref tags which will then appear here automatically Reflist Category Cloud computing ... more details
Contract law An acceleration clause , in the law of contracts , is a term that fully matures the performance due from a party upon a breach of the contract. Such clauses are most prevalent in mortgages and similar contracts to purchase real estate in installments. Suppose, for example, the contract was for A to purchase Blackacre from B for 100,000, to be paid in 5 monthly installments of 20,000. If A makes the first two payments, but fails to make the third payment, an acceleration clause would require that A must immediately pay B the entire balance of 60,000, or lose his right to purchase Blackacre without getting a refund of his 40,000 . A sample acceleration clause reads like this In the event of default in the payment of any of the said installments or said interest when due as herein provided, time being of the essence hereof, the holder of this note may, without notice or demand, declare the entire principal sum then unpaid immediately due and payable. External links http www.quazell.com BusinessLetters ltrpromnot3.html Promissory Note Installment With Acceleration Clause http www.investorwords.com 36 acceleration clause.html Acceleration Clause Investorwords.com DEFAULTSORT Acceleration Clause Category Contract law Category Contract clauses law term stub ... more details
No footnotes date April 2009 Fermi acceleration ref M. A. Lieberman and A. J. Lichtenberg, Phys. Rev. A 5, 1852 1972 ref , sometimes referred to as diffusive shock acceleration a subclass of Fermi acceleration , is the acceleration that charge physics charged Subatomic particle particles undergo when being repeatedly reflected, usually by a magnetic mirror . This is thought to be the primary mechanism by which particles gain non thermal energies in astrophysical shock waves . It plays a very important role in many astrophysical models, mainly of shocks including solar flares and supernova remnant s. It is studied by using the Fermi Ulam model . There are two types of Fermi acceleration First order Fermi acceleration in shocks and Second Order Fermi acceleration in the environment of moving magnetized gas clouds . In both cases the environment has to be collisionless in order for the mechanism to be effective. This is because Fermi acceleration only applies to particles with energies exceeding the thermal energies, and frequent collisions with surrounding particles will cause severe energy loss and as a result no acceleration will occur. First order Fermi acceleration Shock waves typically have moving magnetic inhomogeneities both preceding and following them. Consider the case of a charged ... can cross the shock and enter the game of acceleration. It is presently unclear what mechanism causes the particles to initially have energies sufficiently high to do so. Second order Fermi acceleration Second order Fermi Acceleration relates to the amount of energy gained during the motion of a charged ... second order Fermi acceleration, because the mean energy gain per bounce depends on the mirror velocity ... setup is very similar to the one found for first order Fermi acceleration. References reflist ... David Darling s article on Fermi acceleration http arxiv.org abs astro ph 0610141 Rieger, Bosch Ramon and Duffy Fermi acceleration in astrophysical jets. Astrophys.Space Sci. 309 119 125 2007 Category ... more details
measurements The Particle acceleration of the air particles a in m s of a plain sound wave is math ... acceleration v Meters per second m s particle velocity m, meters particle displacement math ... more details
unreferenced date July 2009 In computing , Hardware acceleration is the use of computer hardware to perform some function faster than is possible in computer software software running on the general purpose Central processing unit CPU . Examples of hardware acceleration include blitting acceleration functionality in graphics processing unit s GPUs and instructions for complex operations in CPUs. Normally, processors are sequential, and instructions are executed one by one. Various techniques are used to improve performance hardware acceleration is one of them. The main difference between hardware and software is concurrency computer science concurrency , allowing hardware to be much faster than software. Hardware accelerators are designed for computationally intensive software code. Depending upon granularity, hardware acceleration can vary from a small functional unit to a large functional block like motion estimation in MPEG 2 . The hardware that performs the acceleration, when in a separate unit from the CPU, is referred to as a hardware accelerator , or often more specifically as graphics accelerator or floating point unit floating point accelerator , etc. Those terms, however, are older and have been replaced with less descriptive terms like video card or graphics card . Many hardware accelerators are built on top of field programmable gate array chips. Recently, regular expression hardware acceleration has been gaining popularity in the server industry, owing to very noticeable speed ups in anti spam techniques spam control . citation needed date January 2011 See also Coprocessor Field programmable gate array GPGPU SSL acceleration TCP Offload Engine Categories Category Central processing unit Category Gate arrays Category Graphics hardware de Hardwarebeschleunigung es Aceleraci n por hardware eu Hardware bidezko azelerazio fr Acc l ration mat rielle gl Aceleraci n por hardware ko it Acceleratore informatica nl Hardware acceleratie ja ru ... more details
refimprove date December 2010 In physics , gravitational acceleration is the acceleration on an object caused by force of gravity gravity . Neglecting friction such as air resistance, all small bodies accelerate in a gravitational field at the same rate relative to the center of mass. ref cite book title Physics, the human adventure from Copernicus to Einstein and beyond edition 3rd author Gerald James Holton and Stephen G. Brush publisher Rutgers University Press year 2001 isbn 9780813529080 page 113 url http books.google.com books?id czaGZzR0XOUC&pg PA113&dq 22gravitational acceleration 22 22all objects 22 neglecting air&hl en&ei KSb8TIDVIofGsAOUsNX2DQ&sa X&oi book result&ct result&resnum 1&ved 0CCgQ6AEwAA v onepage&q 22gravitational 20acceleration 22 20 22all 20objects 22 20neglecting 20air&f false ref This equality is true regardless of the masses or compositions of the bodies. At different points on Earth, objects fall with an acceleration between 9.78 and 9.82 m s sup 2 sup depending on latitude , with a convention norm conventional standard gravity standard value of exactly 9.80665 m s sup 2 sup approx. 32.174 ft s sup 2 sup . Objects with low densities do not accelerate ... The Center of mass barycentric gravitational acceleration at a point in space is given by math mathbf ... constant . The relative acceleration of two objects in the reference frame of either object ... mass, relative gravitational acceleration does not depend on each mass separately. As long as one mass is much smaller than the other, relative gravitational acceleration is almost independent of the smaller ... the same acceleration, relative to an inertial frame or the frame of the large mass. Disregarding ... acceleration, in that the proper acceleration and hence four acceleration of objects in free fall are zero. Rather than undergoing an acceleration, objects in free fall travel ... DEFAULTSORT Gravitational Acceleration Category Gravimetry Category Gravitation interwiki ar ... more details
Tidal is the adjectival form of the word tide . It may also refer to Tidal album , a 1996 album by American singer songwriter Fiona Apple Tidal Bible , , pronounced Tid al , a king involved in the Battle of the Vale of Siddim Tidal railway station in Tidal, Manitoba, Canada. disambig bs Plima vor pt Tidal desambigua o ... more details
Classical mechanics cTopic Fundamental concepts Angular acceleration is the rate of change of angular velocity . In SI units, it is measured in radian s per second squared rad s sup 2 sup , and is usually denoted by the Greek letter alpha letter alpha . ref http theory.uwinnipeg.ca physics circ node3.html ref Mathematical definition The angular acceleration can be defined as either math alpha frac d omega dt frac d 2 theta dt 2 math , or br math alpha frac a T r math , where math omega math is the angular velocity , math a T math is the linear tangential acceleration , and r is the distance from the origin of the coordinate system that defines math theta math and math omega math to the point of interest. Equations of motion For two dimensional rotation rotational motion , Newton s laws of motion Newton s second law Newton s second law can be adapted to describe the relation between torque and angular acceleration math tau I alpha math , where math tau math is the total torque exerted on the body, and math I math is the Moment of inertia mass moment of inertia of the body. Constant acceleration For all constant values of the torque, math tau math , of an object, the angular acceleration will also be constant. For this special case of constant angular acceleration, the above equation will produce a definitive, constant value for the angular acceleration math alpha frac tau I . math Non constant acceleration For any non constant torque, the angular acceleration of an object will change with time. The equation becomes a differential equation instead of a constant value. This differential equation is known as the equation of motion of the system and can completely describe the motion of the object. It is also the best way to calculate the angular velocity. See also Angular momentum Angular speed Angular velocity Rotation Spin physics Spin References reflist Category Physical quantities ar be be x old bs Ugaono ubrzanje ... more details
unreferenced date February 2007 TCP acceleration is the name of a series of techniques for achieving better throughput on an Internet connection than standard Transmission Control Protocol TCP achieves, without modifying the end applications. It is an alternative or a supplement to TCP tuning . Commonly used approaches include ACK pacing , TCP Proxy server transparent proxies in two or more middlebox es, and TCP Offload Engine TCP offload engines . TCP transparent proxies TCP transparent proxies involve breaking of long end to end control loops to several smaller control loops by intercepting and relaying TCP connections within the network. By adopting this procedure, they allow for the TCP flows to have a shorter reaction time to packet losses which may occur within the network and thus guarantees a higher throughput. The idea of a TCP accelerator is to terminate TCP connections inside the network ... loop between the sender and the receiver is shortened to the one between the acceleration node and the receiver ... received by it. The acceleration node splits the feedback loop between the sender and the receiver ..., not delivered to the receiver. Asymmetric TCP acceleration While TCP proxies require such devices ... the proxies are usually proprietary, asymmetric TCP acceleration is able to boost the network performance .... Asymmetric TCP acceleration implies the WAN side protocol has to be TCP of the same 5 tuples ... download acceleration in addition to its congestion avoidance algorithm. Compared with the symmetric TCP proxies, asymmetric TCP acceleration is more flexible in all kinds of deployment scenarios. A typical setup is to deploy the asymmetric acceleration device on the server side only. Then all ... wise, without compression factors, asymmetric TCP acceleration is capable of offering the same ... on the receiver side. Products and companies implementing TCP acceleration AppEx Networks FAST TCP See also TCP tuning TCP congestion avoidance algorithm Category TCP IP Acceleration Category WAN optimization ... more details
In special relativity , four acceleration is a four vector and is defined as the change in four velocity over the particle s proper time math mathbf A frac d mathbf U d tau left gamma u dot gamma u c, gamma u 2 mathbf a gamma u dot gamma u mathbf u right left gamma u 4 frac mathbf a cdot mathbf u c , gamma u 2 mathbf a gamma u 4 frac left mathbf a cdot mathbf u right c 2 mathbf u right math , where math mathbf a d mathbf u over dt math and math dot gamma u frac mathbf a cdot u c 2 gamma u 3 frac mathbf a cdot u c 2 frac 1 left 1 frac u 2 c 2 right 3 2 math and math gamma u math is the Lorentz factor for the speed math u math . A dot above a variable indicates a derivative with respect to the coordinate time in a given reference frame, not the proper time math tau math . In an instantaneously co moving inertial reference frame math mathbf u 0 math , math gamma u 1 math and math dot gamma u 0 math , i.e. in such a reference frame math mathbf A left 0, mathbf a right math Geometrically, four acceleration is a curvature vector of world line . ref http www.britannica.com EBchecked topic 147246 curvature vector Curvature vector on Britannica ref Therefore, the magnitude of the four acceleration which is an invariant scalar is equal to the proper acceleration that a moving particle feels moving along a world line . The world lines having constant magnitude of four acceleration are Minkowski circles i.e. hyperbolas see hyperbolic motion relativity hyperbolic motion The scalar product of a four velocity and the corresponding four acceleration is always 0. Even at relativistic speeds four acceleration is related to the four force such that math F mu mA mu math where m is the invariant mass of a particle. In general relativity the elements of the acceleration four vector are related to the elements of the four velocity through a covariant derivative with respect to proper time. math ... Four Acceleration Category Minkowski spacetime Category Relativity es Cuadriaceleraci n it Quadriaccelerazione ... more details
Orphan date December 2010 In physics the study of rigid body motion provides for several ways of defining the acceleration state of a rigid body. The classical definition of acceleration entails following a single particle point along the rigid body and observing its changes of velocity . In this article the notion of spatial acceleration is explored, which entails looking at a fixed unmoving point in space and observing the changes of velocity of whatever particle point happens to coincide with the observation point. This is similar to the acceleration definition fluid dynamics where typically one can measure velocity and or accelerations on a fixed locate inside a testing apparatus. Definition Consider a moving rigid body and the velocity of a particle point P along the body being a function of time and position. math vec v P vec v t, vec r P math The spatial acceleration Expand section date June 2008 References cite book title Fluid Mechanics author Frank M. White publisher McGraw Hill Professional year 2003 isbn 0072402172 . cite book title Robot Dynamics Algorithms author Roy Featherstone publisher Springer year 1987 isbn 0898382300 . This reference effectively combines screw theory with rigid body dynamics mechanics dynamics for robotic applications. The author also chooses to use spatial accelerations extensively in place of material accelerations as they simplify the equations and allows for compact notation. JPL DARTS page has a section on spatial operator algebra link http dshell.jpl.nasa.gov SOA index.php as well as an extensive list of references link http dshell.jpl.nasa.gov References index.php . cite book title Springer Handbook of Robotics author Bruno Siciliano, Oussama Khatib publisher Springer year 2008 isbn . Page 41 link Google Books http books.google.com books?id Xpgi5gSuBxsC&printsec frontcover PPA40,M1 defines spatial accelerations for use in rigid body mechanics. Category Rigid bodies ... more details
Academic acceleration is the advancement of students in subjects at a rate that places them ahead of where they would be in the regular school curriculum. Acceleration is most often used as an intervention to accommodate the learning needs of gifted and talented students. According to A Nation Deceived , the following types of acceleration exist ref Types of Acceleration Dimensions and Issues, by W. T. Southern and E. D. Jones, A Nation Deceived, V. II , Chapter 1, pp. 5 12. ref Early Admission to Kindergarten Students enter kindergarten prior to the minimum age for school entry as set by district or state policy. Early Admission to First Grade where kindergarten does not exist This practice can result from either the skipping of kindergarten, or from accelerating the student from kindergarten in what would be the student s first year of school. Grade skipping Continuous Progress The student is given content progressively as prior content is completed and mastered. Self paced instruction The student proceeds through learning and instructional activities at a self selected pace. Self paced instruction is a sub type of continuous progress acceleration. Subject Matter Acceleration Partial Acceleration This practice allows students to be placed with classes with older peers for a part of the day or with materials from higher grade placements in one or more content areas. Combined Classes While not, in and of itself, a practice designed for acceleration, in some instances e.g., a fourth ... or activity. Acceleration in College The student completes two or more majors in a total of four years ... of college teachers and administrators. Late academic acceleration A student or person that has under achieved in early years and has academically progressed in studies Academic acceleration also ... Policy Guidelines Guidelines for Developing an Academic Acceleration Policy http www.accelerationinstitute.org The Institute for Research and Policy on Acceleration IRPA education stub Category Gifted ... more details
Image Sun crypto accelerator 1000.jpg thumb PCI Crypto Accelerator SSL acceleration is a method of offloading the processor intensive public key encryption algorithms involved in Transport Layer Security SSL transactions to a hardware accelerator. Typically this means having a separate card that plugs into a Conventional PCI PCI slot in a computer that contains one or more Coprocessor co processors able to handle much of the SSL processing. SSL accelerators may use off the shelf CPUs, but most use custom ASIC s and RISC chips to do most of the difficult computational work. How it works The most computationally expensive part of an SSL session is the SSL handshake, where the SSL server usually an SSL webserver and the SSL client usually a web browser agree on a number of parameters that establish the security of the connection. Part of the role of the SSL handshake is to agree on session keys symmetric keys, used for the duration of a given session , but the encryption and signature of the SSL handshake messages itself is done using asymmetric keys contained in the certificates , which requires more computational power than the symmetric cryptography used for the encryption decryption of the session data. Typically a hardware SSL accelerator will offload processing of the SSL handshake while leaving the server software to process the less intense Symmetric key algorithm symmetric cryptography of the actual SSL data exchange, but some accelerators act as a proxy handling all SSL ... TLS is essentially an updated form of SSL, TLS session acceleration is essentially the same thing as SSL acceleration. TLS & SSL TLS 1 was first defined in RFC 2246 in January 1999 as an upgrade ... Acceleration http www1.us.dell.com content topics global.aspx power en ps1q02 ssl?c us&l en&s gen Overview of SSL Acceleration Implementations http www.windowsecurity.com articles SSL Acceleration Offloading Security Implications.html SSL Acceleration and Offloading What Are the Security Implications ... more details
Plasma Wakefield acceleration is a technique for accelerating charged particle s, such as electron s, positron ... pulses, a technique known as laser plasma acceleration . These techniques appear to offer a way to build ... can be applied. However, the wake appears very similar to the blowout regime, and the physics of acceleration is the same. Acceleration Image Illustration Plasma Wakefield Acceleration.png thumb 400px Wake created by an electron beam in a plasma It is this wakefield that is used for particle acceleration. A particle injected into the plasma near the high density area will experience an acceleration toward or away from it, an acceleration that continues as the wakefield travels through the column ... with RF Acceleration The advantage of plasma acceleration is that its acceleration field can ... dielectric breakdown of the acceleration tube. This limits the amount of acceleration over any given ... based on plasma acceleration techniques or accelerators for much higher energy can be built, if long accelerators are realizable with an accelerating field of 10 GV m. Plasma acceleration is categorized into several types according to how the electron plasma wave is formed plasma wakefield acceleration PWFA The electron plasma wave is formed by an electron bunch laser wakefield acceleration LWFA A laser pulse is introduced to form an electron plasma wave. laser beat wave acceleration LBWA The electron ... laser wakefield acceleration SMLWFA The formation of an electron plasma wave is achieved by a laser ... of plasma acceleration was first proposed by Toshiki Tajima and John Dawson in a theoretical article ... acceleration, which was performed with PWFA, was reported by a research group at Argonne National Laboratory in 1988. ref Rosenzweig et al. 1988. Experimental Observation of Plasma Wake Field Acceleration. Phys. Rev. Lett. 61 98 101 doi 10.1103 PhysRevLett.61.98 ref Formula The acceleration gradient ... name for experimental particle accelerator s using plasma acceleration. Currently such devices ... more details
refimprove date February 2010 Infobox album See Wikipedia WikiProject Albums Name Acceleration Type studio Artist Age of Silence Cover Age of Silence Acceleration.jpg Released Start date 2004 9 14 Recorded 2004 Genre Avant garde metal , nowrap progressive metal Length 45 10 Label The End Records Producer Andy Winter This album Acceleration br 2004 Next album Complication Trilogy Of Intricacy br 2005 Album ratings noprose yes rev1 Allmusic rev1Score Rating 3.5 5 ref Allmusic class album id r706222 pure url yes Allmusic review ref Acceleration is the first full length album by Norway Norwegian avant garde metal avant garde progressive metal band Age of Silence . It was released on September 14, 2004. Track listing Auditorium of Modern Movements Winter, Lazare 3 36 Acceleration Winter, Lazare 4 30 The Concept of Hate Winter, Lazare 4 09 A Song for D. Incorporated Winter, Lazare 4 58 The Green Office and the Dark Desk Drawer Winter, Lazare 4 17 The Flow at 9 30 am Winter, Lazare 6 25 Of Concrete and Glass Winter, Lazare 3 14 90 Angles Extant, Lazare 7 19 I No Longer Know If I Am Mad Extant, Kobbergaard 2 28 Synthetic, Fabricated, Calculated Extant, Lazare 4 11 Personnel Lars Nedland Lars Are Lazare Nedland Singing vocals Jan Axel Blomberg Jan Axel Hellhammer Blomberg Drum kit drums Lars Eikind Si Bass guitar bass , Backing vocalist backing vocals Joacim Extant Solheim guitar Helge Kobbergaard Haugen Electric guitar guitar , vocals on I No Longer Know If I Am Mad Andy Winter musician Andy Winter Keyboard instrument keyboards References Reflist Category Age of Silence albums Category 2004 debut albums Category The End Records albums ... more details
merge to Download manager date January 2012 Unreferenced date February 2007 Redir Download accelerator the specific proprietary program for Windows and Mac OS X Download Accelerator Plus Download acceleration , also known as multipart download, is a term for the method employed by software such as download manager s to download a single file by splitting it in segments and using several simultaneous connections to download these segments from a single server. The reason for doing so is to circumvent server side limitations of bandwidth per connection. Because in normal networking situations all individual connections are treated equally, rather than actual file transfers, multiple connections yields an advantage on saturated links over simple connections, both in terms of total bandwidth allocation and resilience. Many servers, however, implement a maximum number of simultaneous connections per client in order to mitigate this. This is not to be confused with segmented downloading , which allows a client to download segments of a file simultaneously from multiple servers. Download managers DEFAULTSORT Download Acceleration Category Data transmission Compu network stub ... more details
The acceleration voltage describes the effective voltage surpassed by a charged particle along a defined straight line. If not specified further, the term is likely to refer to the longitudinal effective acceleration voltage math V parallel math . The acceleration voltage is an important quantity for the design of microwave cavity microwave cavities for particle accelerator s. See also shunt impedance . For the special case of an electrostatic field that is surpassed by a particle, the acceleration voltage is directly given by integrating the electric field along its path. The following considerations are generalized for time dependent fields. ombox image File Info.svg 30px text There are several variant definitions for the terms shunt impedance and acceleration voltage relating to transit time dependence. ref name lee cite book title Accelerator physics last Lee first Shyh Yuan authorlink coauthors date 2005 publisher World Scientific location isbn 9789812562005 ref ref name wangler cite book title RF Linear Accelerators last Wangler first Thomas date 2008 edition 2nd publisher Wiley VCH isbn 9783527623433 slightly different notation ref To clear this point, this page differentiates between effective including transit time factor and time independent quantities. Longitudinal voltage The longitudinal effective acceleration voltage is given by the kinetic energy gain experienced by a particle with velocity math beta c math along a defined straight path path integral of the longitudinal Lorentz forces divided by its charge, ref name wangler math V parallel beta frac 1 q vec e s cdot int vec F L s,t , mathrm d s frac 1 q vec e s cdot int vec F L s, t frac s beta c , mathrm d s math . For resonant structures, e.g. Superconducting Radio Frequency SRF cavities , this may be expressed ... which relates the effective acceleration voltage math V parallel beta math to the time independent acceleration voltage math V 0 int E s , mathrm d s math . In this notation, the effective acceleration ... more details
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