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Topic: Plasticity (physics)

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  Physics of Strength and Plasticity - The MIT Press
Professor Orowan has been one of the principal contributors to the field of physics of plasticity and strength.
The 17 papers on the Physics of Plasticity fall into two categories: (1) Individual Dislocations and Basic Deformation Mechanisms, and (2) Hardening Mechanisms and Dislocation Dynamics.
The 10 papers on the Physics of Strength concentrate on (1) Cracks and Fracture, and (2) Geology.
mitpress.mit.edu /catalog/item/default.asp?ttype=2&tid=9736   (237 words)

  Plasticity Information
Plasticity (physics): In physics and engineering, plasticity is the propensity of a material to undergo permanent deformation under load.
Phenotypic plasticity: Describes the degree to which an organism's phenotype is determined by its genotype.
Synaptic plasticity: In neuroscience, plasticity is a property of a neuron or synapse to change its internal parameters in response to its history.
www.bookrags.com /wiki/Plasticity   (114 words)

 Is glass liquid or solid?
There is still much about the molecular physics and thermodynamics of glass which is not well understood, but we can give a general account of what is thought to be the case.
Plasticity means that they deform and don't return to the original shape when the stress is removed.
The resistance to flow under plastic deformation is called its viscoplasticity.
www.weburbia.com /physics/glass.html   (2566 words)

 Bambooweb: Plastic
Plastics are polymers: long-chain of carbon- or silicon-based molecules.
Foam plastics can be synthesized in an "open cell" form, in which the foam bubbles are interconnected, as in an absorbent sponge, and "closed cell", in which all the bubbles are distinct, like tiny balloons, as in gas-filled foam insulation and floatation devices.
Another plastic that was critical to the war effort was "synthetic rubber", which was produced in a variety of forms.
www.bambooweb.com /articles/p/l/Plastic.html   (5101 words)

 Physics: matter
There is still much about the molecular physics and thermodynamics of glass that is not well understood, but we can give a general account of what is thought to be the case.
Plasticity means that they deform and don't return to their original shape when the stress is removed.
The resistance to flow under plastic deformation is called its viscoplasticity.
en.allexperts.com /q/Physics-1358/matter.htm   (1637 words)

 Is glass liquid or solid?
There is still much about the molecular physics and thermodynamics of glass that is not well understood, but we can give a general account of what is thought to be the case.
Plasticity means that they deform and don't return to their original shape when the stress is removed.
Materials with plasticity do not flow, but they may creep, meaning they deform slowly but only when held under constant stress.
math.ucr.edu /home/baez/physics/General/Glass/glass.html   (2570 words)

 Biological Physics -- WFU
In the first project, the goal is to identify areas of structural plasticity in proteins of similar or related function and to correlate those regions of plasticity with the location of functional sites and the chemistry of those functional sites.
The kinetics of depolymerization is therefore not only useful in understanding the physics of polymerization and depolymerization(and how this affects cell rigidity), but it is also important in understanding the clinical severity of the disease.
The goal of this research is to determine physical properties (rupture force, elasticity, strength, etcÂ…) of individual biomolecules and to put the results in a biological context.
www.wfu.edu /physics/biological.html   (1658 words)

 Recycled Plastic Lumber
Their name isderived from the fact that in their semi-liquid state they are malleable, or have the property of plasticity.
Plastics vary immensely in heat tolerance,hardness, and resiliency.
Plastics are polymers : long-chain of carbon - or silicon -based molecules.
www.altvetmed.com /face/33401-recycled-plastic-lumber.html   (1023 words)

 Theory of Cortical Plasticity
It elucidates, in a manner that is accessible to students as well as researchers, the role which the BCM theory has played in guiding research and suggesting experiments that have led to our present understanding of the mechanisms underlying cortical plasticity.
This is provided complete with source code, and enables the reader to repeat any of the simulations quoted in the book as well as to vary either parameters or assumptions.
Plasticity is thus a research and an educational tool.
www.physics.brown.edu /physics/researchpages/Ibns/CorticalPlasticity.htm   (193 words)

 Physics Division | Research Highlights | Los Alamos National Laboratory
These models are devised and calibrated using experiments in which samples are subjected to high pressures, usually from shock waves induced by the detonation of high explosives or the impact of flyers.
The stress at which plastic flow occurs on these time scales has been investigated for single crystals and polycrystalline foils of materials, including beryllium, iron, tantalum, nickel-titanium, nickel aluminide, and ruthenium aluminide.
The results have contributed to the development of time-dependent plasticity models and of simulations with explicit treatment of the motion of dislocations.
www.lanl.gov /orgs/p/rh03_swift.shtml   (1983 words)

 Alloy, Metal Terminology (P)
Non-elastic or plastic, deformation of metal under stress, after passing the elastic limit.
Copper base alloys, with 3.5 to 10% of tin, to which has been added in the molten state phosphorous in varying amounts of less than 1% for deoxidizing and strengthening purposes.
Those properties familiarly discussed in physics, exclusive of those described under mechanical properties; for example, density, electrical conductivity, co-efficient of thermal expansion.
www.metal-mart.com /Dictionary/dictletp.htm   (1188 words)

 USF Department of Physics
APPLIED PHYSICS AT We are a growing department located in an urban setting in the vibrant Tampa Bay area.
The Department of Physics biophysics research group is featured in a recent article in “The Biological Physicist” – the newsletter of the Division of Biological Physics of the American Physical Society.
The Department of Physics invites applications for a nine month tenure-track faculty position at the Assistant Professor level to begin in August 2007, contingent upon final administrative approval.
www.cas.usf.edu /physics   (604 words)

 Chrzan CMS DCChrzan
Philosophical Doctorate in Physics specializing in condensed matter theory, Department of Physics, University of California, Berkeley, under the guidance of Professor L. Falicov, December 1989.
Criticality in the Plastic Deformation of L12 Compounds.
Physics Department Colloquium, University of Oregon, Eugene, Oregon, February 1994.
cms.mse.berkeley.edu /people/dcc-cv.htm   (1726 words)

 Solid and Structural Mechanics Books-Lubliner   (Site not responding. Last check: 2007-10-06)
A self-contained text dealing with plasticity theory of materials is presented for advanced undergraduate and graduate students.
The finite element method for both viscoplastic and rate-independent plastic solids is discussed; large deformation plasticity numerical methods for rate-based formulations and hyperelastic methods are also included.
Partial contents: introduction to continuum thermomechanics; the physics of plasticity; constitutive theory; problems in contained plastic deformation; problems in plastic flow and collapse I- theories and exact solutions; problems in plastic flow and collapse II- applications of limit analysis; dynamic problems; large deformation plasticity.
www.solid.ikp.liu.se /solidbook/lubl.html   (119 words)

 USF Department of Physics
Short-Term Plastic Changes in Neurons: One fundamental property of neurons is their "plasticity", i.e.
We are using high-speed optical recording techniques to monitor stimulation-induced changes in electrical activity and the spatio-temporal patterns of calcium levels in the axons and nerve terminals of hypothalamic neurons.
Using these optical data and simplified computational models, we are trying to unravel the cellular and sub-cellular mechanisms giving rise to neuronal plasticity at the presynaptic level.
nosferatu.cas.usf.edu /physics/muschol.html   (339 words)

 Study Provides Insight Into How the Brain Loses Plasticity of Youth
Plasticity, the ability of functional brain circuits to change in response to experience-dependent neuronal activity, is largely restricted to critical periods of development.
In their classic Nobel-prize winning experiments, David Hubel and Torsten Weisel showed that visual areas of the brain are responsive to environmental cues during a discrete period early in life, after which they do not change.
Researchers have successfully identified proteins that promote such critical periods of plasticity but less is known about the proteins that stabilize neuronal connections.
www.physorg.com /news75043466.html   (845 words)

 Classics in the History of Psychology -- James (1890) Chapter 4
Plasticity, then, in the wide sense of the word, means the possession of a structure weak enough to yield to an influence, but strong enough not to yield all at once.
Organic matter, especially nervous tissue, seems endowed with a very extraordinary degree of plasticity of this sort; so that we may without hesitation lay down as our first proposition the following, that the phenomena of habit in living beings are due to the plasticity [2] of the organic materials of which their bodies are composed.
If habits are due to the plasticity of materials to outward agents, we can immediately see to what outward influences, if to any, the brain-matter is plastic.
psychclassics.yorku.ca /James/Principles/prin4.htm   (7940 words)

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Plasticity : In physics and engineering, plasticity is the propensity of a material to undergo permanent deformation under load.
In civil engineering, plasticity of a soil is quantitatively determined by Atterberg Limits testing.
www.buzznet.com /tags/plasticity   (44 words)

 CiteULike: Tag plasticity   (Site not responding. Last check: 2007-10-06)
Brain-derived neurotrophic factor restores synaptic plasticity in a knock-in mouse model of Huntington's disease.
Plasticity and the functional reorganization of the human brain.
Spike-timing-dependent plasticity of inhibitory synapses in the entorhinal cortex.
www.citeulike.org /tag/plasticity   (1144 words)

 OSU Physics: Calendar of Events
Description: Plastic changes of synapses are essential for processing and storing information in the brain.
Previous studies demonstrated a critical role of gene transcription and protein synthesis in synaptic plasticity.
I will describe our recent studies on charactering genes related to synaptic plasticity and mechanisms underlying activity-regulated protein synthesis in neuronal dendrites.
www.physics.ohio-state.edu /calendar/event.php3?id=1416   (61 words)

 Feldenkrais at Home. Eileen Bach-y-Rita bio
A Ph.D. in physics, he became interested in the mechanics of human movement and developed a self-defense method similar to Judo for the Israeli army.
In her private practice, clients with a variety of physical injuries and limitations, and a variety of special needs, come to see her from afar to spend full days or weeks for the rapid relearning possibilities she facilitates for them.
For the last 35 years, she has studied the advances in the field of brain plasticity and has combined this knowledge with the ideas of Dr. Moshe Feldenkrais, Dr. Candace Pert, and Dr. Milton Erikson with excellent results for her clients and students.
www.feldenkraisathome.com /about_author.html   (716 words)

 plasticity - OneLook Dictionary Search
plasticity : Cambridge International Dictionary of English [home, info]
Plasticity : Drug Discovery and Development [home, info]
Phrases that include plasticity: plasticity index, brain plasticity, neural plasticity, cortical plasticity, index of plasticity, more...
www.onelook.com /?w=plasticity   (210 words)

 Department of Civil Engineering
Courses in elasticity, plasticity, viscoelasticity, stability, dynamics, finite elements and boundary integral methods, constitutive methods, fracture mechanics, plates and shells, give the student the necessary knowledge and skill to study the behavior of modem materials and structures as well as advance the state of art.
Small-scale models made of different materials (steel, concrete, wood, plastic) are tested to study the response of the prototype structural elements and/or assemblies.
Selected topic in structural steel design including plastic design, torsion, lateral buckling, torsional-flexural buckling, frame stability, plate girders, and connections, including critical review of current design specifications relating to these topics.
www.case.edu /cse/eciv/bull.html   (3873 words)

 A-Z Index - Begell House Inc.
Handbook of Physical Properties of Liquids and Gases
Physical Kinetics and Transfer Processes in Phase Transitions
Physical Quantities and the Units of the International System (SI)
www.begellhouse.com /azindex   (324 words)

 TAU Physics Colloquium - Argaman
Physics Department, N.R.C.N. Polycrystalline materials behave as elastic, relatively rigid bodies under small loads, but exhibit plastic deformation and flow under sufficiently large applied stresses.
A critical reassesment of the multiscale program will be given, emphasizing the need to develop theoretical insight and to diversify the set of simulation tools used.
The School of Physics and Astronomy, The Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University.
www.tau.ac.il /~ronlif/colloquium/abstracts/argaman.html   (246 words)

 Physics - Dynamics - Collision response - Martin Baker
If we need to model the deformations in the materials then we need a more complex model.
Where I can, I have put links to Amazon for books that are relevant to the subject, click on the appropriate country flag to get more details of the book or to buy it from them.
Physics for Game Developers - Assumes a knowledge of vectors, Matrix and trigonometry (the book has a one page introduction to quatnions).
www.euclideanspace.com /physics/dynamics/collision/inelastic.htm   (556 words)

 index   (Site not responding. Last check: 2007-10-06)
The goal of the series is to provide a forum for lectures by experts at the forefront of interdisciplinary areas of biological physics, synaptic plasticity and its cellular and molecular basis, modern molecular and cell biology, as well as computational biology.
All lectures will be held in the Barus and Holley building, home to the Physics Department and the Division of Engineering and very close to the Department of Neuroscience and other life sciences.
Due to the interdisciplinary nature of this lecture series, talks will attract a diverse audience of students and faculty from the disciplines of physics, engineering, chemistry, neuroscience and various other life sciences, as well as researchers from Brown University’s nearby Medical School.
physics.brown.edu /physics/commonpages/frontiers   (235 words)

 IoP article
Now the bubbles are much bigger, as the underlying physics becomes plasticity and dislocation motion, which are influenced by all sorts of things in the material microstructure – we’ll return to this below.
This could be taken as a starting point for exploring the underlying physics of the properties, and whether they can be significantly modified by chemistry and processing.
In both DandT and Physics, the goal is to reverse the decline in numbers of students attracted to HE and careers in materials science and engineering, and to promote academic rigour in teaching of materials.
www-materials.eng.cam.ac.uk /mpsite/physics/str-tough_article   (1013 words)

 ScienceDaily: Myelin Suppresses Plasticity In The Mature Brain
"The failure of surviving neurons to reestablish functionalconnection is most obvious after spinal cord injury, but limited nervecell regeneration and plasticity is central to a range of neurologicaldisorders, including stroke, head trauma, multiple sclerosis, andneurodegenerative disease," said senior author Stephen Strittmatter,professor in the Departments of Neurology and Neurobiology.
Strittmatter's laboratory studies how myelin in the centralnervous system physically limits axonal growth and regeneration aftertraumatic and ischemic injury, when blood supply is cut off.
In mice withaltered NgR, plasticity during the critical period is normal, but itcontinues abnormally so that ocular dominance later in development issimilar to the plasticity of juvenile stages.
www.sciencedaily.com /releases/2005/09/050930081337.htm   (466 words)

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