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In the News (Mon 16 Nov 09)

  
  Ludwig Boltzmann - Wikipedia, the free encyclopedia
Ludwig Eduard Boltzmann ( February 20, 1844 – September 5, 1906) was an Austrian physicist famous for the invention of statistical mechanics.
is engraved on Boltzmann's tombstone at the Vienna Zentralfriedhof.
The Boltzmann equation was developed to describe the dynamics of an ideal gas.
en.wikipedia.org /wiki/Ludwig_Boltzmann   (711 words)

  
 Boltzmann   (Site not responding. Last check: 2007-11-05)
Boltzmann was awarded a doctorate from the University of Vienna in 1866 for a thesis on the kinetic theory of gases supervised by Josef Stefan.
Boltzmann, at least half jokingly, used to say that the reason he moved around so much was that he was born during the dying hours of a Mardi Gras ball.
Boltzmann obtained the Maxwell -Boltzmann distribution in 1871, namely the average energy of motion of a molecule is the same for each direction.
www-groups.dcs.st-and.ac.uk /~history/Mathematicians/Boltzmann.html   (1135 words)

  
 Ludwig Boltzmann
Ludwig Eduard Boltzmann was born on February 20, 1844 in a house on the main street of the Landstrasse district of Vienna, the son of an "Imperial and Royal Cameral-Concipist," a tax official.
By now Boltzmann was well know in the scientific world, and talented young people, such as Svante Arrhenius from Sweden and Walther Nernst from Ge rmany, came to study with him in the mid-eighties.
Boltzmann introduced the Ehrenfest urn Model, an example is the probability formulation in Markov chain terms.
www.mrs.umn.edu /~sungurea/introstat/history/w98/Boltzmann.html   (927 words)

  
 Boltzmann's Work in Statistical Physics
However, Boltzmann's ideas on the precise relationship between the thermodynamical properties of macroscopic bodies and their microscopic constitution, and the role of probability in this relationship are involved and differed quite remarkably in different periods of his life.
Boltzmann is often portrayed as a staunch defender of the atomic view of matter, at a time when the dominant opinion in the German-speaking physics community, led by influential authors like Mach and Ostwald, disapproved of this view.
Boltzmann's complaints in 1896–1898 about an hostile environment are, I think, partly explained by his love of polemic exaggerations, partly also by his mental depression in that period.
plato.stanford.edu /entries/statphys-Boltzmann   (13021 words)

  
 Featured Physicists - Ludwig Boltzmann 1844-1906
The statistical interpretation of thermodynamics was pioneered by James Clerk Maxwell (1831-1879) and brought to fruition by the Austrian physicist Ludwig Boltzmann.
Boltzmann, whose work was based on the concept of atoms, found himself cast as their chief defender and the debates became increasingly bitter.
Always prone to bouts of depression, Boltzmann came to believe that his life's work had been rejected by the scientific community, although this was far from being true.
physicalworld.org /restless_universe/html/ru_bolt.html   (333 words)

  
 Ludwig Boltzmann
Boltzmann's fame is based on his invention of statistical mechanics.
Boltzmann obtained the Maxwell-Boltzmann distribution in 1871, namely the average energy of motion of a molecule is the same for each direction.
Boltzmann worked on statistical mechanics using probability to describe how the properties of atoms determine the properties of matter.
www.corrosion-doctors.org /Biographies/BoltzmannBio.htm   (765 words)

  
 Stefan-Boltzmann law - Wikipedia, the free encyclopedia
The law was experimentally discovered by Jožef Stefan ( 1835 - 1893) in 1879 and theoretically derived in the frame of the thermodynamics by Ludwig Boltzmann ( 1844 - 1906) in 1884.
Boltzmann treated a certain ideal heat engine with the light as a working matter instead of the gas.
This law is the only physical law of nature named after a Slovene physicist.
en.wikipedia.org /wiki/Stefan-Boltzmann_law   (820 words)

  
 Boltzmann Transport Equation
Boltzmann transport equation expresses the global non-equilibrium distribution in terms of the local equilibrium distributions.
Boltzmann transport equation relates the properties of a non-equilibrium system, expressed by a non-equilibrium distribution, in terms of local equilibrium distributions.
Boltzmann transport equation is applied to calculation of the general currents in a medium with particle and temperature gradients.
urila.tripod.com /Boltzmann.htm   (940 words)

  
 Boltzmann constant   (Site not responding. Last check: 2007-11-05)
It is named after the Austrian physicist Ludwig Boltzmann, who made important contributions to the theory of statistical mechanics, in which this constant plays a crucial role.
In principle, the Boltzmann constant is a derived physical constant, as its value is determined by other physical constants.
Given a thermodynamic system at an absolute temperature T, the Boltzmann constant defines an energy E = kT that is, roughly speaking, the typical amount of thermal energy carried by each microscopic particle in the system.
www.sciencedaily.com /encyclopedia/boltzmann_constant   (347 words)

  
 Costante di Boltzmann: Tutte le informazioni su Costante di Boltzmann su Encyclopedia.it   (Site not responding. Last check: 2007-11-05)
Costante di Boltzmann: Tutte le informazioni su Costante di Boltzmann su Encyclopedia.it
Si nota quindi che la costante di Boltzmann è la costante di proporzionalità tra la temperatura e l'energia media di una molecola.
Fu proprio Ludwig Boltzmann a proporla e oggi compare sulla sua tomba come epitaffio.
www.encyclopedia.it /c/co/costante_di_boltzmann.html   (338 words)

  
 Giulio M. Occhionero: Boltzmann Equations, Functional Analysis and Stochastic Processes
I show that linear Boltzmann equations can be solved by inspecting the operatorial properties of its members and that many new cases will be solvable as soon as some questions posed here will be given an answer by functional analysis.
The Boltzmann equation describes the evolution of the average realization of the stochastic process in study where averaging here is: on all possible events.
This is also true for nonlinear Boltzmann equations with integral dependencies where you have a number of integrations (here summations) equal to the degree of appearance of the unknown function.
www.occhionero.info /befasp/befasp.htm   (5456 words)

  
 Vacuum History & Technology
The Boltzmann constant, k, is a fundamental constant of physics occuring in nearly every statistical formulation of both classical and quantum physics.
During these investigations Boltzmann worked out the general law for the distribution of energy among the various parts of a system at a specific temperature.
Boltzmann was also one of the first Europeans to recognize the importance of the electromagnetic theory proposed by James Clerk Maxwell of England.
www.mcallister.com /vacuum.html   (2684 words)

  
 AllRefer.com - Ludwig Boltzmann (Physics, Biography) - Encyclopedia
Ludwig Boltzmann [loot´vikh bOlts´mAn] Pronunciation Key, 1844–1906, Austrian physicist, b.
Boltzmann made important contributions to the kinetic theory of gases and to statistical mechanics : the Boltzmann constant, which relates the mean total energy of a molecule to its absolute temperature, is used widely in statistics and is named for him.
Working independently, he demonstrated a law on fl body radiation that had been stated by the Austrian physicist Josef Stefan; hence the law is sometimes known as the Stefan-Boltzmann law.
reference.allrefer.com /encyclopedia/B/Boltzman.html   (211 words)

  
 Physics Today September 2001
Boltzmann was not only one of the most creative and influential physicists of the 19th century, but one of its most colorful personalities as well.
There is also a fine account of Boltzmann's visit to England for the 1894 British Association meeting, where he found the reception of the H -theorem and kinetic theory generally to be considerably more favorable than elsewhere in Europe.
There is, however, only a brief mention of Boltzmann's papers of 1871 and later, in which he developed the formalism of equilibrium statistical mechanics that Gibbs later put to such good use.
www.physicstoday.org /pt/vol-54/iss-9/p53a.html   (664 words)

  
 Ludwig Boltzman
In 1884 the work of Josef Stefan was developed by Boltzmann who showed how Josef Stefan's empirical T4 law for fl body radiation, formulated in 1879, could be derived from the principles of thermodynamics.
Boltzmann continued to defend his belief in atomic structure and in a 1905 publication Populäre Schriften he tried to explain how the physical world could be described by differential equations which represented the macroscopic view without representing the underlying atomic structure.
May I be excused for saying with banality that the forest hides the trees for those who think that they disengage themselves from atomistics by the consideration of differential equations.
www.shsu.edu /~icc_cmf/bio/boltzman.html   (1203 words)

  
 Lattice Boltzmann Models   (Site not responding. Last check: 2007-11-05)
The simulation of the Boltzmann equation is performed on a regular lattice and the forms of the collision function
The model is updated in the same manner as the lattice gas model except that now, instead of considering individual particles to be travelling along the links, it is the distribution function which is evolved.
The lattice Boltzmann model has the advantages associated with the lattice gas model but all the lattice gas difficulties have been overcome.
www.ph.ed.ac.uk /~jmb/thesis/node13.html   (204 words)

  
 Chapter 14. Boltzmann's Constant
Therefore, in SE units, the value of Boltzmann's constant is an electron's rest-mass energy divided by its threshold temperature for a value of unity.
The value of Boltzmann's constant in SG units is the same as it is in SE units because both the masson's rest-mass energy and threshold temperature are greater than those of the electron by the same factor
Boltzmann's constant, Avogadro's number, and the universal gas constant do not exist, as such.
www.writword.com /unituniv/c14.htm   (248 words)

  
 BOOK REVIEW
Chapter 9 is entitles "Boltzmann's contributions to other branches of physics." I have previously mentioned (endnote 5)his studies in radiation theory leading to the famous Stefan-Boltzmann law.
One thing not mentioned so far is the fact that Boltzmann's work eventually led recalcitrant scientists to accept the existence of atoms (although the final nail was not hammered into the coffin until Einstein's 1905 paper on Brownian motion).
Chapter 11 "Boltzmann and his contemporaries" goes into some of the differing points of views which Boltzmann and his contemporaries shared, not only on the question of atoms but, more fascinatingly, on the whole problem of whether or not classical mechanics had any validity.
www.pzweifel.com /music/boltzmann_secondo.htm   (1549 words)

  
 Where does the Boltzmann factor come from?   (Site not responding. Last check: 2007-11-05)
This is a factor that shows up in situations where the temperature, T, is given; it is (proportional to) the probability that the system is in a state with energy E, where k is Boltzmann's constant (which you may have seen in the ideal gas law in a chemistry class).
The Boltzmann factor is the basis of a huge amount of thermodynamic and statistical physics, both classical and quantum.
We define k (Boltzmann's constant) in (1) so that T is in whatever temperature units we want to use.
world.std.com /~mmcirvin/boltzmann.html   (2625 words)

  
 Maxwell Boltzmann distribution - Wikipedia, the free encyclopedia
Search for Maxwell Boltzmann distribution in other articles.
Look for Maxwell Boltzmann distribution in Wiktionary, our sister dictionary project.
Look for Maxwell Boltzmann distribution in the Commons, our repository for free images, music, sound, and video.
www.wikipedia.org /wiki/Maxwell_Boltzmann_distribution   (121 words)

  
 History of Kinetic Theory
In particular, Boltzmann shows his equation is dissipative and proves that Maxwellians are the only equilibria of the collision operator.
The physicists in London at which Boltzmann was present, Burbury observed that any two particles that collide would henceforth be correlated, a fact which would seem to eventually render invalid the assumption made by Maxwell and Boltzmann that particles are uncorrelated before collisions.
Basically Zermelo correctly asserts that Boltzmann's argument is not on firm mathematical while his argument is, but goes on to incorrectly assert that it follows that Boltzmann is wrong.
www.math.umd.edu /~lvrmr/History/index.shtml   (2064 words)

  
 Boltzmann factor - Education - Information - Educational Resources - Encyclopedia - Music
In physics, the Boltzmann factor is a weighting factor determining the relative probability of a system in thermodynamic equilibrium at a temperature T being in a state with energy E :
To normalize the Boltzmann factor into a probability, one simply divides it by the sum Z of the Boltzmann factors of all possible states of a system, which sum is called the partition function.
From the Boltzmann factor, one can then derive the Maxwell-Boltzmann statistics, Bose-Einstein statistics, and Fermi-Dirac statistics that govern classical particle s as well as quantum mechanical boson s, and fermion s, respectively.
www.music.us /education/B/Boltzmann-factor.htm   (388 words)

  
 PhilSci Archive - Boltzmann’s Method of Philosophy
The method of Ludwig Boltzmann (1844 – 1906), a great Austrian physicist-philosopher, for solving philosophical problems was described.
Theoretical pluralism developed by Boltzmann can be used as a basic assumption in philosophizing the epistemological problems.
Boltzmann states how both science and philosophy can go astray in the absence of this collaboration, since they are indeed unit.
philsci-archive.pitt.edu /archive/00001719   (167 words)

  
 The Boltzmann Equation   (Site not responding. Last check: 2007-11-05)
The classical Boltzmann equation is derived and the macroscopic quantities of mass, velocity and energy are defined in terms of the distribution function which describes the fluid.
It is shown that the Boltzmann description of the fluid satisfies the fluid conservation equations.
An outline of the derivation of the Navier-Stokes equation and a discussion of the equilibrium distribution are given for the binary collision model.
www.ph.ed.ac.uk /~jmb/thesis/node18.html   (124 words)

  
 Red Blood Cells Initiate Leukocyte Rolling in Postcapillary Expansions: A Lattice Boltzmann Analysis -- Sun et al. 85 ...
Fluid particle velocities of a two-dimensional lattice Boltzmann model with nine velocities are illustrated at the left lower corner.
Boltzmann codes, on which this model was based.
Sun, C. Adaptive lattice Boltzmann model for compressible flows: viscous and conductive properties.
www.biophysj.org /cgi/content/full/85/1/208   (4786 words)

  
 Ludwig Boltzmann - Pictures   (Site not responding. Last check: 2007-11-05)
Ludwig Boltzmann ( February 20, 1844 - September 5, 1906) was an Austrian physicist famous for the invention of statistical mechanics.
Boltzmann committed suicide in 1906 by hanging while on holiday in Duino near Trieste in Italy.
The motivation behind the suicide remains unclear, but it may have been related to his lingering resentment over establishment science's rejection of his theories.
www.greatestinfo.org /Ludwig_Boltzmann   (184 words)

  
 Maxwell-Boltzmann Distribution Law   (Site not responding. Last check: 2007-11-05)
T is the absolute temperature, N is number of molecules, m is mass of a molecule, v is the velocity of a molecule, k is the Boltzmann constant 13.805 x 10
By analysis of the transfer of momentum during collisions between molecules, Maxwell determined that the volume element must be multiplied by the Boltzmann factor exp(-
Below is a plot of the probability distribution of molecules as a function of velocity at three temperatures.
www.tannerm.com /maxwell_boltzmann.htm   (143 words)

  
 DAMOCLES: Monte Carlo solution of the Boltzmann transport equation
The Monte Carlo (MC) method is a numerically efficient way to solve the Boltzmann Transport Equation (BTE), which governs the motion of electrons and holes in semiconductors.
The method itself, now ubiquitous in computational science, was originally devised by Stanislaw Ulam to solve the BTE for transport of neutrons in the fissile material of the A-bomb.
This is used to solve numerically the Poisson equation, yielding the electric field used to move particles in free flights...and so on in a self-consistent loop.
www.research.ibm.com /DAMOCLES/html_files/mc.html   (711 words)

  
 Lattice Boltzmann Methods
The lattice Boltzmann method is a powerful technique for the computational modeling of a wide variety of complex fluid flow problems including single and multiphase flow in complex geometries.
This means that for larger systems, a larger proportion of the time is in the parallelizable computation and greater benefits can be derived from running on multiple processors.
Nicos Martys, John Hagedorn and Judith Devaney, Lattice Boltzmann Simulations of Single and Multi-Component Flow in Porous Media in Mesoscopic Modeling: Techniques and Applications, Nicolaides and Bick (Ed.), Marcel Dekker, Inc., (to be published).
math.nist.gov /mcsd/savg/parallel/lb   (872 words)

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