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Topic: Body physics


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In the News (Fri 22 Mar 19)

  
  AllRefer.com - black body (Physics) - Encyclopedia
fl body, in physics, an ideal fl substance that absorbs all and reflects none of the radiant energy falling on it.
Since a fl body is a perfect absorber of radiant energy, by the laws of thermodynamics it must also be a perfect emitter of radiation.
In thermodynamics the principle of the fl body is used to determine the nature and amount of the energy emitted by a heated object.
reference.allrefer.com /encyclopedia/B/blackbod.html   (440 words)

  
 Ragdoll physics - Wikipedia, the free encyclopedia
In computer game engines, ragdoll physics are a type of procedural animation that is often used as a replacement for traditional static death animations.
This had the advantage of low CPU usage, as all that was needed to animate a "dying character" was choose from a set number of pre-drawn animations.
A ragdoll is therefore a collection of multiple rigid bodies (each of which is ordinarily tied to a bone in the graphics engine's skeletal animation system) tied together by a system of constraints that restrict how the bones may move relative to each other.
en.wikipedia.org /wiki/Ragdoll_physics   (768 words)

  
 Physics engine - Wikipedia, the free encyclopedia
A physics engine is a computer program that simulates Newtonian physics models, using variables such as mass, velocity, friction and wind resistance.
In video games, or other forms of interactive computing, the physics engine will have to simplify its calculations and lower their accuracy so that they can be performed in time for the game to respond at an appropriate rate for gameplay.
Physics based character animation in the past only used rigid body dynamics because they are faster and easier to calculate, but modern games and movies are starting to use soft body physics now that it is possible.
en.wikipedia.org /wiki/Physics_engine   (512 words)

  
 Rigid Body Collisions - Physics Simulation
Physics of Collision for Rigid Bodies in 2 Dimensions
Physically Based Modeling is a set of course notes from Siggraph '97 by Andrew Witkin and David Baraff.
Let the vector n be normal (perpendicular) to the edge of body B that is being impacted, and pointing outward from body B. Also let the vector n be of length 1.
www.myphysicslab.com /collision.html   (2989 words)

  
 Physics - Crystalinks
Physics is the science that deals with the structure of matter and the interactions between the fundamental constituents of the observable universe.
Physics plays an important role in all the natural sciences, however, and all such fields have branches in which physical laws and measurements receive special emphasis, bearing such names as astrophysics, geophysics, biophysics, and even psychophysics.
The body of physics developed up to about the turn of the 20th century, known as classical physics, can largely account for the motions of macroscopic objects that move slowly with respect to the speed of light and for such phenomena as heat, sound, electricity, magnetism, and light.
www.crystalinks.com /physics2.html   (3771 words)

  
 Physical - Overview: Physics Engine   (Site not responding. Last check: 2007-10-30)
In a traditional physics engine, an object such as a box is treated as one discrete entity simulated using Newtonian mechanics.
Furthermore, rigid body physics engines are unable to simulate environments with complex or high numbers of interactions: water flowing over a mill wheel, for example, or flame eating at a building.
In a mass-spring system, physical objects like a box are not whole entities in and of themselves, but are formed out of many smaller particles, referred to in the engine as atoms.
www.aidspan.org /alec/physical/overview_physics.htm   (621 words)

  
 Physics of the Human Body - Physics 3110
Medicine is full of good biological and chemical science, but physics is rapidly taking a greater role.
The purpose of the course is to show how physics is applied in health sciences and in the human body.
There are three scheduled quizes during the semester and you will write a paper or make a presentation on a subject of you choice.
www.physics3110.org   (192 words)

  
 Black Body Physics
The fl body is mainly used as a source of infrared radiatiion.
Plus the fl body would have to be very hot to emit in much in the visible.
The fl body curve itself is not material specfic, but if there is some gas between you and the fl body then this would absorb.
www.newton.dep.anl.gov /askasci/phy99/phy99525.htm   (661 words)

  
 Research - Department of Physics
Astrophysics and Cosmology: Cosmology and elementary particle physics.
Elementary Particle Physics: String theory and unification, duality in gauge theory and string theory, solitons and topological structures, precision electroweak measurements, low-energy supersymmetry, CP violation, heavy quark physics, confinement in QCD, quantum theory of fl holes, large extra dimensions, fermion mass hierarchy, integrable systems.
Beam Physics: Investigation of particle and photon beams and their mutual interactions with the goal of developing novel accelerators or radiation devices.
physics.uchicago.edu /research.html   (929 words)

  
 Graduate Courses - physics @ berkeley
A survey of physical cosmology - the study of the origin, evolution, and fate of the universe.
Prerequisite: Physics 209 or equivalent or consent of instructor.
Individual study in consultation with the major field advisor intended to provide an opportunity for qualified students to prepare themselves for the various examinations required of candidates for the Ph.D. May not be used for unit or residence requirements for the doctoral degree.
www.physics.berkeley.edu /index.php?option=com_content&task=view&id=138&Itemid=261   (1128 words)

  
 Condensates reap Nobel reward (November 2001) - Physics World - PhysicsWeb
In 1924 the Indian physicist Satyendra Nath Bose sent a paper to Einstein in which he derived the Planck law for fl-body radiation by treating the photons as a gas of identical particles.
Atoms can either be bosons or fermions - the latter are particles that obey the exclusion principle and cannot therefore gather in the same quantum state - depending on their intrinsic angular momentum or "spin".
Wieman, who was born in 1951, received his PhD at Stanford and is professor of physics at Colorado.
physicsweb.org /article/world/14/11/8   (1156 words)

  
 Rigid Body Simulation Tutorial   (Site not responding. Last check: 2007-10-30)
The geometry of bodies plays an important role in determining the physics of motion as well as the physics of contact not to mention detecting when contact occurs.
If the body space axes are aligned in this manner, then the computation can be optimized because the inverse of a diagonal matrix is another diagonal matrix with its elements being the reciprocals of the corresponding elements in the original matrix.
To determine the coefficient of restitution of a contact an average of the coefficient of restitution of the two bodies involved is taken.
www.cs.unc.edu /~ehmann/RigidTutorial   (4079 words)

  
 Few-Body Systems Newsletter 1999
The three body problem has and continues to be a fundamental, challenging and unsolved problem in atomic, molecular and nuclear physics.
Funding for few body physics will follow increased understanding of how what we are doing relates and supports those methods and ideas that will guide thinking for key few and many body problems over the next twenty years.
His research has covered a broad area in atomic and particle physics, often concerned with the creation of new theoretical tools and their application to a variety of physical phenomena, with emphasis on field-theoretic and relativistic effects in composite systems.
physics.wm.edu /~carlson/GFB_news_99.html   (3110 words)

  
 Advances in computational many-body physics
This is the first of a new series of meetings to be regularly held in Banff, Alberta.
The scientific focus of this series is on advances in theoretical and computational many-body physics.
The aim is to assess recent progress, as well as to foster scientific communication and exchange of ideas among many-body theorists and practitioners of similar techniques.
www.phys.ualberta.ca /acmb05   (154 words)

  
 Physics Scholars To Receive International Awards
Bishop, professor of physics at the University of Manchester, UK, is cited for his "development of the coupled-cluster method toward a comprehensive ab initio approach, and innovative applications across the full spectrum of subfields of quantum many-body physics."
According to Chin, many-body physics is concerned with understanding the properties of matter in terms of the interactions between the microscopic (atomic and subatomic) constituents of matter.
The medal, established in 1983 by the worldwide many-body physics community in memory of the unique and enduring contributions of Eugene Feenberg to many-body physics, is designated for firmly established work and that can be demonstrated to have significantly advanced the field of many-body physics.
www.tamu.edu /tamunews/News/stories/05/101205news-14.html   (335 words)

  
 Chris Hecker's Rigid Body Dynamics Information
Milestone: You should have a 3D rigid body simulator at this point, with an appropriate orientation representation chosen by understanding and weighing the advantages and disadvantages of the different methods.
Up to this point, we have some amazing simulations going, but our object are all individual rigid bodies, without joints between them to hold them together (although the adventurous among you might have tried to use springs to build an articulated rigid body, with varying levels of success).
There are also the issues of how you create physically based worlds and articulated bodies; you can't just throw polygons together and make an animation loop anymore, but at the same time you can't expect your artists to know all this material.
www.d6.com /users/checker/dynamics.htm   (4229 words)

  
 Research Interests - Wayne Polyzou
The goal of few-body physics is to constrain theories by comparing the results of complete experimental measurements to ``exact'' numerical calculations.
Cluster properties, which relate the physics of many-body systems to the physics of isolated few-body subsystems, provide a means to use few-body methods to determine the Hamiltonian of complex systems with great confidence.
These considerations mean that a theoretical description of strong interaction physics on these scales must be consistent with quantum mechanics (because the sizes and momentum transfers are at the limit dictated by the uncertainty principle) and special relativity (because the kinetic and rest energy of the strongly interacting particles are comparable).
www.physics.uiowa.edu /~wpolyzou/research   (916 words)

  
 Rigid body dynamics
The way I've made it is probably not completely realistic, because I only use velocity vectors to calculate the position of each joint of the "ragdoll", based on an initial velocity vector applied to a joint.
Note that in the diagram, the entire body should be rigid, because of the angle restriction.
That's what I though at first, but that's not correct because the whole body should rotate, until the rotation stabilizes when the body is in kind of a horizontal position (I don't know how to explain it better but if you don't understand I'll draw a diagram).
www.physicsforums.com /showthread.php?p=1013394#post1013394   (521 words)

  
 OSU Physics: Physics 880.05 Nuclear Many-Body Physics
Physical interpretation of Green's function: the quasiparticle concept, model for quasiparticle spectral function, experimental verification of quasiparticle pict.ure in heavy nuclei.
Full of good physics but most of the examples are in the problems, so it can be difficult to learn from.
A combined introduction to quantum field theory as applied to particle physics problems and to nonrelativistic many-body problems.
www.physics.ohio-state.edu /~ntg/880   (2118 words)

  
 Session UA02 - Cent. Symposium: The Three-Body Problem in Atomic, Molecular, and Nuclear Physics.
Large parts of the spectra, including the anomalous three body breakup threshold law, of these venerable systems are well understood using classical dynamics and the modern versions of "old quantum theory".
Further, the unfinished problem of fitting "chaos" into all of this indicates that the ongoing physics of the three body coulomb problem is alive and well, and that these few body systems provide a laboratory for the exploration of quantum chaos.
Three-body physics is one of the cornerstones of theoretical physics.
flux.aps.org /meetings/YR99/CENT99/abs/S7505.html   (606 words)

  
 Total Kinetic Energy of a Body
I was reading my physics text and it came up with the standard formula for the kinetic energy of a rigid body in motion: the sum of the translational and rotational kinetic energy.
That got me wondering whether we could include the internal energy by simply taking the sum of the kinetic energy of each particle when viewed in a frame where the translational and rotational velocity appear to be zero.
This would seem to imply that the total kinetic energy of a body is more or less than the sum of its translation, rotational, and internal energy (assuming the internal energy is as i have defined it).
www.physicsforums.com /showthread.php?t=34141   (297 words)

  
 blender3d.org :: Bullet Physics   (Site not responding. Last check: 2007-10-30)
The new Bullet Physics engine has been integrated into Blender and allows for rigid body physics simulations within the game engine.
The physics engine does not have to be used strictly for playing games.
Then the "Record Game Physics to IPO" option needs to be enabled in the Game menu, then start the game engine by using the "Start Game" in Game menu or pressing the 'P' Key in the 3D window.
www.blender.org /cms/Bullet_Physics.724.0.html   (702 words)

  
 [No title]
This parallels a similar decline in the number of physicists who are actively engaged in such experiments.
INTRODUCTION Low-energy, few-body, hadron physics is an active field of current research in the United States, though the number of physicists engaged in such work and the number of U.S. laboratories where such experiments can be undertaken has declined substantially.
This decline began in the 1970s when physicists in many accelerator labs turned their attention from studies with light ion beams to the newer field of studies with heavy ions.
www.physics.unc.edu /~clegg/pubs/TBCfb17Paper.doc   (1164 words)

  
 Nuclear Physics at the Department of Physics and Astronomy
Research in nuclear physics at UNC focuses on the nature of the nuclear force, nuclear astrophysics, and fundamental symmetries in nature.
Weaving together the fields of astrophysics, nuclear physics, and particle physics, the Few-Body Group examines intriguing problems such as time-reversal violation, parity, and obscure processes in supernovas.
Weaving together the fields of astrophysics, nuclear physics, and particle physics, the Nuclear Theory Group examines intriguing problems such as time-reversal violation, parity, and obscure processes in supernovas.
www.physics.unc.edu /research/nuclear   (325 words)

  
 The Physics Free Body Diagram Builder   (Site not responding. Last check: 2007-10-30)
The internet was the chosen distribution medium because it gives students a chance to work problems wherever they have access to a computer, either in the many computer labs on campus or at their home or a friends home.
This is a subject that is crucial for first year physics students and one that Dr. Zitzewitz has found to be difficult for students to grasp initially.
The Free Body Diagram Builder (FBDB) is an interactive physics homework system limited to one specific type of problem: the free body diagram on blocks in space and blocks on ramps.
www-personal.engin.umd.umich.edu /~physics/ACM_Intro.html   (6613 words)

  
 JigLib - rigid body physics engine
the static world, or another body marked as immovable), then all collisions between this body and other immovable bodies are processed (slightly differently to previously described - the normal impulse is applied without affecting the angular velocity).
After this, the body is itself marked temporarily as immovable, and processing of the body-list continues.
The reason I do this instead of physically moving objects is that if you move an object during a penetration-resolution loop, you'd need to do collision detection on it again in case you move it into an object that it wasn't originally touching.
www.rowlhouse.co.uk /jiglib   (1521 words)

  
 Invited Speakers
It covers a broad spectrum of current research in physics that benefits from the application of many-body theories.
A major aim of the conference series is to foster the exchange of ideas among physicists working in such diverse areas as nuclear and sub-nuclear physics, quantum chemistry, complex systems, lattice Hamiltonians, quantum fluids and condensed matter physics.
The official ceremony for the award is held during the course of the conference.
cnls.lanl.gov /Conferences/Many-BodyTheories   (230 words)

  
 PHY5670, Quantum Many-Body Physics, Spring 2004. Syllabus
Course Work: There will be 6 homework assignments (60% of course grade) and one take home final exam (40% of course grade).
Physical Meaning of the Self Energy for Fermions.
Honor Code: Students are expected to uphold the Academic Honor Code published in the Florida State University Bulletin and the Student Handbook.
www.physics.fsu.edu /courses/Spring04/PHY5670   (224 words)

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