ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Intermittency and Self-Organisation in Turbulence and Statistical Mechanics (2021)
    MDPI - Multidisciplinary Digital Publishing Institute
    Details
    Publication Date: 2023-12-20
    Description: There is overwhelming evidence, from laboratory experiments, observations, and computational studies, that coherent structures can cause intermittent transport, dramatically enhancing transport. A proper description of this intermittent phenomenon, however, is extremely difficult, requiring a new non-perturbative theory, such as statistical description. Furthermore, multi-scale interactions are responsible for inevitably complex dynamics in strongly non-equilibrium systems, a proper understanding of which remains a main challenge in classical physics. As a remarkable consequence of multi-scale interaction, a quasi-equilibrium state (the so-called self-organisation) can however be maintained. This special issue aims to present different theories of statistical mechanics to understand this challenging multiscale problem in turbulence. The 14 contributions to this Special issue focus on the various aspects of intermittency, coherent structures, self-organisation, bifurcation and nonlocality. Given the ubiquity of turbulence, the contributions cover a broad range of systems covering laboratory fluids (channel flow, the Von Kármán flow), plasmas (magnetic fusion), laser cavity, wind turbine, air flow around a high-speed train, solar wind and industrial application.
    Keywords: QA1-939 ; Q1-390 ; non-locality ; hybrid (U)RANS-LES ; channel flow ; thermodynamics ; Lévy noise ; non-local theory ; low speed streaks ; drop breakage ; pipe flow boundary layer ; bifurcation ; Langevin equation ; attached and separated flows ; anomalous diffusion ; kinetic theory ; stochastic processes ; self-organisation ; spatiotemporal chaos ; chaos ; bifurcations ; turbulent flow ; Lyapunov theory ; Rushton turbine ; turbulence ; intermittency ; information length ; denoise ; microcavity laser ; free vortex wake ; IDDES methodology ; local intermittency ; control strategy ; population balance equation ; Tsallis entropy ; coherent structures ; Fokker-Planck equation ; energy cascade ; fluid dynamics ; high efficiency impeller ; fractals ; large eddy simulation ; shear flows ; heat transport ; multifractal ; drop coalescence ; continuous wavelet transform ; T-junction ; scaling properties ; floating wind turbine ; scaling ; fractional Fokker–Plank equation ; magnetic confinement fusion ; multi-scale problem ; coherent structure ; solar wind ; trailing-edge flap ; turbulent transition ; turbulent boundary layer ; complex dynamics ; statistical mechanics ; bic Book Industry Communication::P Mathematics & science
    Language: English
    Format: image/jpeg
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    Ni-Zn-[Fe 4 -S 4 ] and Ni-Ni-[Fe 4 -S 4 ] clusters in closed and open α subunits of acetyl-CoA synthase/carbon monoxide dehydrogenase (2003)
    [s.l.] : Nature Publishing Group
    Nature structural biology 10 (2003), S. 271-279 
    Details
    ISSN: 1072-8368
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The crystal structure of the tetrameric α2β2 acetyl-coenzyme A synthase/carbon monoxide dehydrogenase from Moorella thermoacetica has been solved at 1.9 Å resolution. Surprisingly, the two α subunits display different (open and closed) conformations. Furthermore, X-ray data ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nsb912
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Mean square displacement in small-scale nonlinear dynamos : The 41st annual meeting of the division of plasma physics of the american physical society (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1746-1751 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The stretching property of an underlying fluid is studied in a simplified statistical model of small-scale nonlinear dynamos, via the evolution of the mean square displacement. The nonlinear effect of small-scale magnetic fields is consistently incorporated in the limit of low kinetic Reynolds number. The mean square displacement between two neighboring particles, as well as that of a single particle, is shown to be reduced due to the Lorentz force associated with small-scale magnetic fields. This reduction is suggested to lead to the suppression of stretching of magnetic field lines, and subsequently to the saturation of the growth of small-scale magnetic fields. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873994
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Turbulent transport and equilibrium profiles in two-dimensional magnetohydrodynamics with background shear (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 813-824 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Turbulent transport and equilibrium profile are studied in two-dimensional magnetohydrodynamics (2D MHD) in the presence of a background shear flow and a large-scale magnetic field; the latter quantities are assumed to be parallel and to vary in the perpendicular direction. The nonuniformity of the background is incorporated, to first order, by using the Gabor transform. The magnetic vector potential and momentum fluxes (or total stress) are calculated in both kinematic and dynamic cases in the case of unit magnetic Prandtl number, which then determines turbulent diffusivity and viscosity and equilibrium profile of the mean shear flow. The turbulent diffusion is found to be suppressed for a strong (large-scale) magnetic field. The Lorentz force changes the sign of the total stress resulting in the turbulent viscosity with an opposite sign compared to that in the hydrodynamical case. The former reduces the amplitude of the total stress for a fixed shear due to the cancellation between Reynolds and Maxwell stresses, therefore leading to the reduction in momentum transport. Since the divergence of momentum flux acts as an effective force on the background shear, the presence of the magnetic field can lead to an equilibrium shear profile which is different from that of the pure hydrodynamic case. In particular, the Lorentz force is shown to laminarize the mean shear flow. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1339838
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Eddy viscosity and laminarization of sheared flow in three dimensional reduced magnetohydrodynamic turbulence (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3576-3582 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of Alfvén waves on turbulent momentum transport is studied in three-dimensional reduced magnetohydrodynamic turbulence. A strong external uniform magnetic field B0 is assumed to be present orthogonal to both background shear flow and its inhomogeneity. Energy is injected into the fluid and/or magnetic field on small scales. It is shown analytically that eddy viscosity is reduced as 1/B02 for a strong B0, due to the cancellation of the Reynolds stress by Maxwell stress. The sign of eddy viscosity is found to depend on the detailed properties of forcings. Specifically, it is positive for fluid forcing but depends on the anisotropy of the forcing in the case of magnetic forcing. Furthermore, it is indicated that a magnetic field tends to laminarize a mean shear flow. The possible implication of these results for the dynamics of the zonal flows in tokamaks is discussed in view of the cancellation of stresses. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1383284
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Theory of the momentum flux probability distribution function for drift wave turbulence (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 71-77 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analytical theory of the tails of the probability distribution function (PDF) for the local Reynolds stress (R) is given for forced Hasegawa–Mima turbulence. The PDF tail is treated as a transition amplitude from an initial state, with no fluid motion, to final states with different values of R due to nonlinear coherent structures in the long time limit. With the modeling assumption that the nonlinear structure is a modon (an exact solution of a nonlinear Hasegawa–Mima equation) in space, this transition amplitude is determined by an instanton. An instanton is localized in time and can be associated with bursty and intermittent events which are thought to be responsible for PDF tails. The instanton is found via a saddle-point method applied to the PDF, represented by a path integral. It implies the PDF tail for R with the specific form exp[−cR3/2], which is a stretched, non-Gaussian exponential. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1421616
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Recovery of Lithium from Seawater Using Nano-Manganese Oxide Adsorbents Prepared by Gel Process (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 277-280 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Adsorbing and salvaging extremely small quantities of lithium ion, high-performanceion-exchange type lithium ion adsorbent was prepared through the ion-sieve formation method. The method uses acid treatment after the synthesis of spinel-structured nano-Li〈sub〉1.33〈/sub〉Mn〈sub〉1.67〈/sub〉O〈sub〉4〈/sub〉 precursor through the tartaric acid gel process. It has good selectivity and high efficiency in adsorbing lithium ion in seawater. The generated adsorbent showed a 28.2 mg/g lithium uptake from artificial seawater. This adsorbent further showed a difference reproducibility that was lower than 10% when subjected to five cycles of adsorption and desorption experiments
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.277.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Nonlinear Multi-Cellular Fast Dynamos (1998)
    Springer
    Studia geophysica et geodaetica 42 (1998), S. 328-334 
    Details
    ISSN: 1573-1626
    Keywords: Fast dynamos ; mode coupling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Abstract We investigate the kinematic and dynamic dynamos that result when the magnetic field is assumed to be spatially periodic on a scale twice that of the periodicity of the underlying driving velocity, the “CP flow” of Galloway and Proctor (1992). In the kinematic regime four distinct modes are possible; all appear to exhibit fast dynamo action. In the nonlinear regime mode coupling may occur and different saturated states are possible for the same parameter values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023308804701
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    On a Physically Realistic Fast Dynamo (1998)
    Springer
    Studia geophysica et geodaetica 42 (1998), S. 335-342 
    Details
    ISSN: 1573-1626
    Keywords: fast dynamo ; rotating convection ; chaos ; MHD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Abstract As a step towards a physically realistic model of a fast dynamo, we study numerically a kinematic dynamo driven by convection in a rapidly rotating cylindrical annulus. Convection maintains the quasi-geostrophic balance whilst developing more complicated time-dependence as the Rayleigh number is increased. We incorporate the effects of Ekman suction and investigate dynamo action resulting from a chaotic flow obtained in this manner. We examine the growth rate as a function of magnetic Prandtl number Pm, which is proportional to the magnetic Reynolds number. Even for the largest value of Pm considered, a clearly identifiable asymptotic behaviour is not established. Nevertheless the available evidence strongly suggests a fast dynamo process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023360821539
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    facet.materialart.
    Unknown
    Mixing and matching TREK/TRAAK subunits generate heterodimeric K2P channels with unique properties (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-03-28
    Description: The tandem of pore domain in a weak inwardly rectifying K+ channel (Twik)-related acid-arachidonic activated K+ channel (TRAAK) and Twik-related K+ channels (TREK) 1 and TREK2 are active as homodimers gated by stretch, fatty acids, pH, and G protein-coupled receptors. These two-pore domain potassium (K2P) channels are broadly expressed in the nervous system where they control excitability. TREK/TRAAK KO mice display altered phenotypes related to nociception, neuroprotection afforded by polyunsaturated fatty acids, learning and memory, mood control, and sensitivity to general anesthetics. These channels have emerged as promising targets for the development of new classes of anesthetics, analgesics, antidepressants, neuroprotective agents, and drugs against addiction. Here, we show that the TREK1, TREK2, and TRAAK subunits assemble and form active heterodimeric channels with electrophysiological, regulatory, and pharmacological properties different from those of homodimeric channels. Heteromerization occurs between all TREK variants produced by alternative splicing and alternative translation initiation. These results unveil a previously unexpected diversity of K2P channels that will be challenging to analyze in vivo, but which opens new perspectives for the development of clinically relevant drugs.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...