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  • American Institute of Physics (AIP)  (70)
  • 1995-1999  (70)
  • 1975-1979
  • 1
    Electronic Resource
    Electronic Resource
    Response to "Comment on ‘A Lyapunov functional for stability of ideal magnetohydrodynamic systems in arbitrary motion' " [Phys. Plasmas 5, 1566 (1998)] (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 1568-1571 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this response I will try to clarify the issues brought forward by this comment (hereafter referred to as H&I). © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872817
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  • 2
    Electronic Resource
    Electronic Resource
    Optimal chaos control through reinforcement learning (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 9 (1999), S. 775-788 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A general purpose chaos control algorithm based on reinforcement learning is introduced and applied to the stabilization of unstable periodic orbits in various chaotic systems and to the targeting problem. The algorithm does not require any information about the dynamical system nor about the location of periodic orbits. Numerical tests demonstrate good and fast performance under noisy and nonstationary conditions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166451
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  • 3
    Electronic Resource
    Electronic Resource
    A Lyapunov functional for stability of ideal magnetohydrodynamic systems in arbitrary motion (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1201-1212 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stability properties of an ideal magnetohydrodynamic (MHD) fluid (compressible) in an arbitrary state of motion is explored. A stability condition is formulated in general terms based on the concept of a Lyapunov functional for the system which can be taken to be the Hamiltonian. Special consideration is given to stationary systems where the fluid is bounded by a surface on which the normal component of the fluid velocity is zero. For this case a necessary and sufficient condition for stability in terms of an energy principle is formulated. This can be considered to be a generalization of the classic MHD energy principle. A comparison to normal mode solutions is made. Systems being subjected to forced oscillations around a static equilibrium that may be unstable are of prime interest for dynamic stabilization problems. The present theory also includes results relevant to this type of system, although no details of such problems are presented. The emphasis is on general theory, however, one example of an ordinary fluid which is rotating is discussed in order to get a better understanding of the theoretical results. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872300
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  • 4
    Electronic Resource
    Electronic Resource
    Lithium ion migration pathways in LiTi2(PO4)3 and related materials (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 5484-5491 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The diffusion pathways of Li+ ions within the frameworks of the high conductive solid electrolytes LiTi2(PO4)3 and the Al-doped one Li1.3Ti1.7Al0.3P3O12 are determined by molecular mechanics and molecular dynamics methods. From a potential energy profile for the lithium migration in LiTi2(PO4)3, the barrier height of lithium migration is estimated as 28.95 kJ/mol (0.30 eV) which is in excellent agreement with experimental data. The main influence on the activation energy of lithium diffusion is caused by changes in electrostatic interactions. Long molecular dynamics simulations for Li1.3Ti1.7Al0.3P3O12 also confirm a solid state diffusion process via rare and sporadic hopping of Li+ ions from their energy minimum site to a neighboring energy minimum site. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371550
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  • 5
    Electronic Resource
    Electronic Resource
    A simple low-temperature ultrahigh-vacuum scanning tunneling microscope capable of atomic manipulation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2960-2965 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design of a low-temperature scanning tunneling microscope is described. The microscope can be operated in ultrahigh vacuum in the temperature range between 15 and 300 K. The main features are a scanner which is based on the Besocke "beetle'' design principle combined with a spring suspension of the microscope and complete surrounding of the whole microscope by a 4 K radiation shield. The microscope can be extended to work as a force microscope using the optical lever detection technique for force measurement. It is demonstrated that this comparatively small and reliable setup is well suited to study the adsorption of single atoms and molecules at low temperatures. Moreover, examples of lateral and vertical manipulation of atoms and molecules are shown to demonstrate the performance of the system. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147080
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  • 6
    Electronic Resource
    Electronic Resource
    The de-agglomeration and dispersion of small dust particles—Principles and applications (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 589-595 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A mechanism for the generation of dust dispersions consisting of single micrometer-sized particles in a low pressure gas is discussed. The particles are de-agglomerated and dispersed by injecting a dust sample (powder) together with a small amount of an arbitrary type of gas into a modified turbomolecular pump. The discussed sample release mechanism/dust disperser offers a wide range of possible gas and particle parameters, suitable for different kinds of experiments. We present two applications of our de-agglomeration mechanism. In the first experiment, homogeneous dust clouds were produced under microgravity conditions, and the Brownian motion of the single dust grains was studied. The second application is a matrix isolation technique for the spectroscopical investigation of single dust particles. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147520
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  • 7
    Electronic Resource
    Electronic Resource
    Continuous sorting of magnetizable particles by means of specific deviation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3289-3295 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A device is described that has been developed for continuous magnetic sorting of particles which are typically several micrometers in diameter. In a continuously streaming fluid, strongly magnetizable particles are deviated in a different way from weakly magnetizable particles. The strongly magnetizable particles are focused into a separate stream. The two types of particles can be collected continuously into several vials. Sorting results and applications of this technique are reported. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145496
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  • 8
    Electronic Resource
    Electronic Resource
    Single and multiband modeling of quantum electron transport through layered semiconductor devices (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7845-7869 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Non-equilibrium Green function theory is formulated to meet the three main challenges of high bias quantum device modeling: self-consistent charging, incoherent and inelastic scattering, and band structure. The theory is written in a general localized orbital basis using the example of the zinc blende lattice. A Dyson equation treatment of the open system boundaries results in a tunneling formula with a generalized Fisher-Lee form for the transmission coefficient that treats injection from emitter continuum states and emitter quasi-bound states on an equal footing. Scattering is then included. Self-energies which include the effects of polar optical phonons, acoustic phonons, alloy fluctuations, interface roughness, and ionized dopants are derived. Interface roughness is modeled as a layer of alloy in which the cations of a given type cluster into islands. Two different treatments of scattering; self-consistent Born and multiple sequential scattering are formulated, described, and analyzed for numerical tractability. The relationship between the self-consistent Born and multiple sequential scattering algorithms is described, and the convergence properties of the multiple sequential scattering algorithm are numerically demonstrated by comparing with self-consistent Born calculations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365394
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  • 9
    Electronic Resource
    Electronic Resource
    Dynamics of quantum spin systems in dimer and valence-bond-solid ground states stabilized by competing interactions : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4629-4631 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For special coupling ratios, the one-dimensional (1D) s=1/2 Heisenberg model with antiferromagnetic nearest and next-nearest neighbor interactions has a pure dimer ground state, and the 1D s=1 Heisenberg model with antiferromagnetic bilinear and biquadratic interactions has an exact valence-bond-solid ground state. The recursion method is used to calculate the T=0 spin dynamic structure factor for both models and, for the s=1/2 model, also the dimer dynamic structure factor. New results for line shapes and dynamically relevant dispersions are obtained. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361686
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  • 10
    Electronic Resource
    Electronic Resource
    Order-parameter fluctuations in the frustrated Heisenberg model on the square lattice : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6630-6632 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The T=0 dynamics of the two-dimensional s=1/2 Heisenberg model with competing nearest-neighbor (J1) and next-nearest-neighbor (J2) interactions is explored via the recursion method, specifically the frequency-dependent fluctuations of the order parameters associated with some of the known or suspected ordering tendencies in this system, i.e., Néel, collinear, dimer, and chiral order. The results for the dynamic structure factors of the respective fluctuation operators show a strong indication of collinear order at J2/J1(approximately-greater-than)0.6 and a potential for dimer order at 0.5(approximately-less-than)J2/J1(approximately-less-than)0.6, whereas the chiral ordering tendency is observed to be considerably weaker. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361906
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