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Topic: Quantum hydrodynamics


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In the News (Wed 30 Dec 09)

  
  Quantum hydrodynamics - Wikipedia, the free encyclopedia
Quantum hydrodynamics is more than the study of superfluidity.
Some of the main subjects in quantum hydrodynamics are quantum turbulence, quantized vortices, first, second and third sound, and quantum solvents.
The quantum hydrodynamic equation is an equation in Bohmian mechanics, which, it turns out, has a mathematical relationship to classical fluid dynamics.
en.wikipedia.org /wiki/Quantum_hydrodynamics   (128 words)

  
 Quantum chemistry - Wikipedia, the free encyclopedia
Quantum chemistry is a branch of theoretical chemistry, which applies quantum mechanics and quantum field theory to address issues and problems in chemistry.
Quantum chemistry lies on the border between chemistry and physics, and significant contributions have been made by scientists from both fields.
However, quantum field theory is of interest in many fields of chemistry, including: nuclear chemistry, astrochemistry, sonochemistry, and quantum hydrodynamics.
en.wikipedia.org /wiki/Quantum_chemistry   (1004 words)

  
 MrSci.com: All Science, All the Time
Quantum chemistry is a branch of theoretical chemistry, which applies quantum mechanics (and more recently quantum field theory) to problems in chemistry.
Although the mathematical basis of quantum chemistry had been laid by Schrodinger in 1926, it is generally accepted that the first true calculation in quantum chemistry was that of the German scientists Walter Heitler and Fritz London on the hydrogen (H2) molecule in 1927.
Quantum chemistry is a branch of theoretical chemistry, which applies quantum mechanics to problems in chemistry...
www.mrsci.com /chemistry/quantum.html   (856 words)

  
 Self organization and quantum jumps
Quantum jumps lead to an iterative process since the the reaction of a subsystem produces a new state, which in turn is possibly perceived by some subsystem.
Quantum TGD suggests the replacement of Haken's theory with a quantum description based on the generalization of the Thom's catastrophe theory to configuration space context and the introduction of spin glass analogy and p-adic fractality at the fundamental level.
Quantum average effective spacetime is not unique: in particular, the nondeterminism of classical time development associated with the Kähler action forces to generalize the concept of 3-surface by replacing it with a disjoint union of very strongly but not totally correlated 3-surfaces possessing timelike separations.
www.physics.helsinki.fi /~matpitka/selforg.html   (4966 words)

  
 Session V13 - Quantum Dynamics, Control and Computing: Quantum Trajectory Approaches.
The method, referred to as the Quantum Trajectory Method (QTM), is based upon the equations of quantum hydrodynamics that were developed by Bohm and others.
The quantum fluid dynamics (QFD) formulation is based on the separation of the amplitude and phase of the complex wave function in Schrodinger's equation.
Model quantum trajectory calculations based upon a moving least-squares scheme illustrate the effects of decoherence and energy dissipation on the quantum trajectories.
flux.aps.org /meetings/YR01/MAR01/abs/S7630.html   (1025 words)

  
 [ michigan-land-for-sale.com | Quantum hydrodynamics Resources ]   (Site not responding. Last check: 2007-10-31)
Quantum hydrodynamics is more than the schoolwork of superfluidity.
Some of the required subjects in quantum hydrodynamics are quantum turbulence, quantized vortices, first, second 'n third sound, 'n quantum solvents.
The quantum hydrodynamic equation is an equation in Bohmian mechanics, which, it turns out, has a mathematical publication to classical fluid dynamics.
www.michigan-land-for-sale.com /Quantum_hydrodynamics   (132 words)

  
 Freed, Karl - Component of : Early Ideas in the History of Quantum Chemistry.
Quantum Dynamics of a Molecule (Atom) in a Coherent Radiation Field.
Quantum Mechanical Theory of Isotope Effect on Thermally Activated Hydrogen Migration on W(110).
Quantum Interference and Asymptotic Interactions in the Photodissociation of SH: Total Cross Section and Branching Ratios.
www.quantum-chemistry-history.com /Free_Dat/Freed2.htm   (7858 words)

  
 PROFESSOR ISAAK M. KHALATNIKOV   (Site not responding. Last check: 2007-10-31)
He isotopes; has developed the hydrodynamic theory of the rotating superfluid liquid (the Khalatnikov-Bekarevich equations); has given the theory of the temperature gap on the interface of liquid He and solids (Kapitza gap); has formulated the general phenomenological theory of the Fermi-Bose liquid mixtures.
Noteworthy are also the works of I.M. Khalatnikov on relativistic hydrodynamics (these results have been applied to the theory of multiple particle creation) as well as the virtuose, in terms of the mathematical methods, work on the threedimensional semi-classical scattering in quantum mechanics.
A new direction in quantum cosmology was initiated during the past years based on a model of gravity induced by complex scalar field.
khalat.itp.ac.ru   (1257 words)

  
 Quantum hydrodynamics
Some of the main subjects in quantum hydrodynamics are quantum turbulence, quantized vortices, first soundfirst, second soundsecond and third sound, and quantum solvents.
The quantum hydrodynamic equation is an equation in Bohm interpretationBohmian mechanics, which, it turns out, has a mathematical relationship to classical fluid dynamics.
Many famous scientists have worked in quantum hydrodynamics, including Richard Feynman, Lev Davidovich LandauLev Landau, and Pyotr Leonidovich KapitsaPyotr L. Kapitsa.
www.territoriopc.com /eng/quantum_hydrodynamics.php   (112 words)

  
 Quantum Dynamics with Trajectories: Introduction to Quantum Hydrodynamics (Interdisciplinary Applied Mathematics) by ...
Quantum Dynamics with Trajectories: Introduction to Quantum Hydrodynamics (Interdisciplinary Applied Mathematics) by Robert E. Wyatt
This is the first book to present these developments in the broader context of the hydrodynamical formulation of quantum dynamics.
On the pedagogical side, a number of sections of this book will be accessible to students who have had an introductory quantum mechanics course.
www.notpricyatall.com /Quantum-Dynamics-with-Trajectories-Introduction-to-Quantum-Hydrodynamics-Interdisciplinary-Applied-Mathematics-0_0387229647_1   (227 words)

  
 Hydrodynamics   (Site not responding. Last check: 2007-10-31)
The Hydrodynamics Group, LLC is an ensemble of some of the Country s leading experts in the earth sciences.
This lab is dedicated to the study of all aspects of marine hydrodynamics.
Bubble hydrodynamics measurements generally consist of making single bubbles through a capillary tube, and video imaging (high speed or normal video camera) followed by computer digitization and...
pipefins.mawnfins.com /hydrodynamics   (562 words)

  
 QMath9
Quantum maps are a theoretical laboratory for questions in quantum chaos.
For a general class of unitary quantum maps, whose underlying classical phase space is divided into ergodic and non-ergodic components, we prove analogues of Weyl's law for the distribution of eigenphases, and the Schnirelman-Zelditch-Colin de Verdiere Theorem on the equidistribution of eigenfunctions with respect to the ergodic components of the classical map (quantum ergodicity).
Some related results concerning quantum hydrodynamics and regularization of hyperbolic type non linear partial differential equations in the presence of shocks are also presented.
www.cpt.univ-mrs.fr /~qmath9/abstracts_QCS.html   (844 words)

  
 Hydrodynamics Instruction On Hydrodynamics Wealth
OE 630 Hydrodynamics Development of the kinematic and dynamic equations for incompressible fluid flow, Navier-Stokes equation, velocity potential and stream function, Bernoulliís equation, conformal...
Hydrodynamics is fluid dynamics applied to liquids, such as water, alcohol, oil, and blood.
Encyclopedia Encyclopedia Hydrodynamics Hydrodynamics is fluid dynamics applied to liquids, such as water, alcohol, oil, and blood.
flow.meldflow.com /hydrodynamicsehi   (766 words)

  
 Computational Approaches to Time-Dependent Quantum Dynamics Workshop
However, manifestly quantum mechanical phenomena such as transitions between coupled electronic states, electronic coherence and its decay, or quantum mechanical tunneling require fundamental modification of the purely classical equations of motion.
When viewed from the trajectory ensemble perspective, quantum effects arise as a breakdown of the statistical independence of the trajectories in the ensemble and a nonlocal entanglement of their collective evolution.
The quantum subsystem is described by a wave packet depending on the quantum coordinates x and parametrically on the classical trajectories X(t).
www.cfa.harvard.edu /itamp/quantum.html   (3441 words)

  
 University of Chicago Materials Center   (Site not responding. Last check: 2007-10-31)
We consider a quantum version of this equation and show that it gives the quantum hydrodynamics description of the Calogero-Sutherland model.
We discuss a general method of constucting quantum loop gases with such behavior, focusing in particular on the simplest time-reversal-invariant model, whosecontinuum description is related to SO(3) Chern-Simons theory.
The central problem regarding operation of quantum bits (qubits) is maintaining the phase coherence in the presence of a noisy environment.
mrsec.uchicago.edu /seminars_05-06.html   (2351 words)

  
 Naboj Dynamical Peer Review (alpha)
We show that in quantum liquids the vacuum energy density is not determined by the quantum zero-point energy of the phonon modes.
In the same manner the cosmological constant is not determined by the zero-point energy of quantum fields.
The same may hold for the Higgs mass problem: the quadratically divergent quantum correction to the Higgs potential mass term is also cancelled by the microscopic (trans-Planckian) degrees of freedom due to thermodynamic stability of the whole quantum vacuum.
www.naboj.com /handle_display.php?section=gr-qc&number=0505104   (218 words)

  
 Irreversibility
Kinetic theory appears to be the simplest level at which one may consistently describe both quantum interference and irreversible phenomena (Prigogine, 1980).
Hydrodynamics (as embodied in Ohm's law and the drift-diffusion equation in solid-state physics) provides no means to describe quantum effects such as resonance phenomena because it retains no information on the distribution of particles with respect to energy or momentum.
The present neglect of the collision term is merely for the sake of simplicity, and it should be borne in mind that such a term may be readily added to any of the calculations to be discussed (see Appendix 14).
www.utdallas.edu /dept/ee/frensley/technical/opensyst/node8.html   (1033 words)

  
 Hydrodynamics Instruction On Hydrodynamics Wealth
HR Wallingford Ltd Hydrodynamics & Hydraulics "Understanding the dynamics of moving water to help engineers and decision makers" When developing infrastructure, it is essential to have a detailed...
Hydrodynamics and variability of hydrological parameters in the Baltic Sea - modelling and numerical simulations 1 A fully three dimensional s - level model based on the Princeton Ocean Model code...
Hydrodynamics and Mathematical Modeling of Circulation and Transport Phenomena in Tidal Estuaries...
twophaseflow.meldflow.com /hydrodynamics   (781 words)

  
 Hydrodynamics Tips Above Hydrodynamics Wealth   (Site not responding. Last check: 2007-10-31)
Hydrodynamics of galactic cooling flows Alexei Kritsuk, Tomasz Plewa & Ewald Mueller Buoyant structures in various environments Thermodynamics of hot interstellar gas with radiative cooling and mass...
Alphabetical index Quantum hydrodynamics Quantum hydrodynamics is the study of superfluidity.
Some of the main subjects in quantum hydrodynamics are quantum...
twophaseflow.madephase.com /hydrodynamics   (838 words)

  
 Juengel   (Site not responding. Last check: 2007-10-31)
A one-dimensional quantum Euler-Poisson system for semiconductors for the electron density and the electrostatic potential in bounded intervals is considered.
The existence and uniqueness of strong solutions with positive electron density is shown for quite general (possibly non-convex or non-monotone) pressure-density functions under a ``subsonic'' condition, i.e.
The proof is based on a reformulation of the dispersive third-order equation for the electron density as a nonlinear elliptic fourth-order equation using an exponential transformation of variables.
www.univie.ac.at /EMIS/journals/AM/04-4/am1154.htm   (106 words)

  
 Quantum News Summer June 17, 2005
In a stunning display of advanced yacht roll control and stabilization technology, Quantum Marine Engineering is pleased to announce that the first ZeroSpeed™ MagLift™ rotary stabilizer system delivered by Quantum successfully completed sea trials in Brazil on June 16, 2005.
The Quantum “brains trust” was present to conduct these trials, evidence of the magnitude of this latest stabilizer development.
Quantum would also like to take this opportunity to say a huge “thank you” to the owner of this exceptional yacht, who offered his new build as the test bed for this technology.
www.quantumhydraulic.com /yachthydraulicnews17.html   (456 words)

  
 [No title]
Abstract: We discuss hydrodynamic moment expansions for mixed quantum states, their relation to Bohmian pure-state hydrodynamics, and recent applications to molecular quantum dynamical problems.
The talk then focusses on a hybrid quantum-classical formulation which combines a hydrodynamic description for the quantum subsystem with a Liouville-space description for the classical subsystem.
These phenomena which are expected to be present in most of small molecules, and more generally quantum many body problems, are described with simple and concrete examples.
www-fourier.ujf-grenoble.fr /CONGRES/JSCM04/Exposes.html   (1117 words)

  
 Research Faculty: Aephraim M. Steinberg
Groups around the world are studying using such optical lattices for quantum information, and one of the biggest stumbling blocks is likely to be the poorly-understood nature of the loss of quantum coherence.
Quantum Process Tomography on vibrational states of atoms in an optical lattice, S.H. Myrskog, J.K. Fox, M.W. Mitchell, and A.M. Steinberg, Phys.
Quantum algorithms in the presence of decoherence: optical experiments, QELS 03 talk by M. Mohseni, J. Lundeen, K. Resch, and A. Steinberg.
www.physics.utoronto.ca /~aephraim/aephraim.html   (2519 words)

  
 Web server of HYKE /preprint.php
The steady-state viscous quantum hydrodynamics model in one space dimension is studied.
The equations are derived from a Wigner-Fokker-Planck model and they contain a third-order quantum correction term and second-order viscous terms.
The proofs are based on a reformulation of the problem as a fourth-order ellliptic equation by using an exponential variable transformation.
www.hyke.org /preprint.php?ext=true&preprintyear=2004&numero=021   (258 words)

  
 Physik - Relativistische Quantentheorie - Bibscout
Quantum mechanics from general relativity : an approximation for a theory of inertia
Stochastic quantum mechanics and quantum spacetime : a consistent unification of relativity and quantum theory based on stochastic spaces
Modern quantum mechanics with applications to elementary particle physics : an introduction to contemporary physical thinking; relativistic quantum mechanics, quantum theory of scattering,...
titan.bsz-bw.de /bibscout/U/UK/UK.1400?navBatchStart=30   (292 words)

  
 April 19, 2005   (Site not responding. Last check: 2007-10-31)
The prospect of spintronics looks like a promising avenue for technology and interesting physics.
In this talk, I will study the quantum hydrodynamics of a spin-orbit coupled electron fluid such as the one in semiconductors.
Particular attention will be paid to the possibility, or impossibility, of spin superfluidity, because of the interesting recent suggestion of dissipationless spin supercurrents at room temperatures.
www.uah.edu /physics/colloquia/2005_Spring/20050419_Santiago.html   (125 words)

  
 TACC > Quantum Chemical Dynamics
In many such systems, the molecules are "metastable," requiring only a small addition or loss of energy to dissociate or combine.
Exact prediction of rapid chemical dynamics requires quantum physics approaches because of the small spatial scales of the events.
The traditional computational approach to these dynamics relies on algorithms to solve the time-dependent Schrödinger equation, which describes how the wavefunction of a physical system (such as a dissociating molecule) evolves over time.
www.tacc.utexas.edu /research/users/wyatt   (155 words)

  
 Quantum Dynamics with Trajectories : Introduction to Quantum Hydrodynamics (Interdisciplinary Applied Mathematics) -- ...   (Site not responding. Last check: 2007-10-31)
The purpose of this book is to present recent developments and applications of quantum trajectory methods in the broader context of the hydrodynamical formulation of quantum dynamics.
While many chapters of the book deal with Lagrangian quantum trajectories in which the velocity matches that of the probability fluid, other chapters deal with what will be termed post-Lagrangian trajectories.
On the pedagogical side, a number of sections will be accessible to students who have had at least one course in quantum dynamics.
www.cadgate.com /book/un/387229647   (192 words)

  
 Northwestern University Mathematical Calendar   (Site not responding. Last check: 2007-10-31)
Semiconductor devices--like the resonant tunneling diode--that rely on quantum tunneling are playing an increasingly important role in advanced microelectronic applications, including multiple-state logic and memory devices and high frequency oscillators.
An extension of hydrodynamics to quantum mechanical electron flow will be presented that is mathematically rigorous for classical potentials with discontinuities--as are present at heterojunction barriers in quantum semiconductor devices.
Smooth QHD simulations of resonant tunneling diodes will be presented which exhibit enhanced quantum resonance with respect to the original QHD model, and which show better agreement with experimental current-voltage curves.
www.math.northwestern.edu /calendar/abstract.cgi?id=872715450&dyear=1997   (167 words)

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