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On the Problem of Optimal Approximation of the Four-wave Kinetic I...

By: V. G. Polnikov; L. Farina

Description: Centro de Previsão de Tempo e Estudos Climáticos (CPTEC), Instituto Nacional de Pesquisas Espaciais (INPE), CPTEC/INPE, Cachoeira Paulista, SP, 12630-000, Brazil. The problem of optimization of analytical and numerical approximations of Hasselmann's nonlinear kinetic integral is discussed in general form. Considering the general expression for the kinetic integral, a principle to obtain the optimal approximation is formulated. From this consi...

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Scaling Property of Ideal Granitic Sequences : Volume 14, Issue 3 ...

By: F. Agterberg; Q. Cheng; D. Xu

Description: State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan (430074), China. Quantification of granite textures and structures using a mathematical model for characterization of granites has been a long-term attempt of mathematical geologists over the past four decades. It is usually difficult to determine the influence of magma properties on mineral crystallization forming fined-grained granites due to its ...

Banavar, J. R., Damuth, J., Maritan, A., et al.: Scaling in ecosystems and the linkage of macroecological laws, Phys. Rev. Lett., 98(6), 068104, doi:10.1103/PhysRevLett.98.068104, 2007.; Benguicui, L. and Blumenfeld-Lieberthal, E.: From lognormal distribution to power law: A new classification of the size distributions, Int. J. Modern Phys. C, 17(10), 1429–1436 2006.; Bohez, E. L. J.: Two level cluster analysis based on fractal dimension and iteratedfunction systems (IFS...

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Chaos in Magnetoplasmas : Volume 6, Issue 3/4 (30/11/-0001)

By: B. Buti

Description: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA. A nonlinear wave, in general, is equivalent to a nonlinear dynamical system, which exhibits the phenomena of chaos. By means of techniques of nonlinear dynamical systems, we have investigated the conditions under which nonlinear Alfvén waves and lower-hybrid waves can become chaotic. The role of heavy ions, in controlling the chaos in magnetoplasmas, is examined. ...

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A Stochastic Iterative Amplitude Adjusted Fourier Transform Algori...

By: C. Simmer; V. Venema; F. Ament

Description: Meteorologisches Institut, Universität Bonn, Germany. A stochastic version of the Iterative Amplitude Adjusted Fourier Transform (IAAFT) algorithm is presented. This algorithm is able to generate so-called surrogate time series, which have the amplitude distribution and the power spectrum of measured time series or fields. The key difference between the new algorithm and the original IAAFT method is the treatment of the amplitude adjustment: it is not p...

Andrzejak, R. G., Lehnertz, K., Rieke, C., Mormann, F., David, P., and Elger, C. E.: Indications of nonlinear deterministic and finite dimensional structures in time series of brain electrical activity: Dependence on recording region and brain state, Phys. Rev. E., 64, 061907, 2001.; Brown, A. R., Cederwall, R. T., Chlond, A., Duynkerke, P. G., Golaz, J. C., Khairoutdinov, M., Lewellen, D. C., Lock, A. P., MacVean, M. K., Moeng, C. H., Neggers, R. A. J., Siebesma, A. P.,...

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Calibration of a Radiocarbon Age : Volume 19, Issue 3 (19/06/2012)

By: D. J. Keenan

Description: The Limehouse Cut, London E14 6N, UK. The calibration of a radiocarbon age to a calendar date is reviewed. It is shown that the commonly-used programs for calibration sometimes give results that are significantly in error.

Bronk Ramsey, C.: Development of the radiocarbon calibration program, Radiocarbon, 43, 355–363, program available at: http://c14.arch.ox.ac.uk/oxcal.html (last access: 11 June 2012), 2001.; Bronk Ramsey, C.: Bayesian analysis of radiocarbon dates, Radiocarbon, 51, 337–360, 2009.; Buck, C. E., Christen, J. A., and James, G. N.: BCal: an on-line Bayesian radiocarbon calibration tool, Internet Archaeology, 7, program available...

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On Mhd Waves, Fire-hose and Mirror Instabilities in Anisotropic Pl...

By: B.-j. Wang; L.-n. Hau

Description: Institute of Space Science, National Central University, Jhongli, Taiwan, R.O.C.. Temperature or pressure anisotropies are characteristic of space plasmas, standard magnetohydrodynamic (MHD) model for describing large-scale plasma phenomena however usually assumes isotropic pressure. In this paper we examine the characteristics of MHD waves, fire-hose and mirror instabilities in anisotropic homogeneous magnetized plasmas. The model equations are a set o...

Dasgupta, B., Tsurutani, B. T., and Janaki, M. S.: A kinetic approach to the Pondermotive Force, Geophys. Res. Lett., 30, 2128, doi:10.1029/2003GL017385, 2003.; Farrugia, C. J., Vasquez, B., Richardson, I. G., Torbert, R. B., Burlaga, L. F., Biernat, H. K., Mühlbachler, S., Ogilvie, K. W., Lepping, R. P., Scudder, J. D., Berdichevsky, D. E., Semenov, V. S., Kubyshkin, I. V., Phan, T. D., and Lin, R. P.: A reconnection layer associated with a magnetic cloud, Adv. Space Re...

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Topology and Seasonal Evolution of the Network of Extreme Precipit...

By: N. Marwan; B. Bookhagen; P. Martin; V. Stolbova; J. Kurths

Description: PIK Potsdam Institute of Climate Impact Research, P.O. Box 601203, 14412 Potsdam, Germany. This paper employs a complex network approach to determine the topology and evolution of the network of extreme precipitation that governs the organization of extreme rainfall before, during, and after the Indian Summer Monsoon (ISM) season. We construct networks of extreme rainfall events during the ISM (June–September), post-monsoon (October–December), and pre-m...

Achuthavarier, D., Krishnamurthy, V., Kirtman, B. P., and Huang, B.: Role of the Indian Ocean in the ENSO–Indian Summer Monsoon Teleconnection in the NCEP Climate Forecast System, J. Climate, 25, 2490–2508, 2012.; Barreiro, M., Marti, A. C., and Masoller, C.: Inferring long memory processes in the climate network via ordinal pattern analysis, Chaos, 21, 013101, doi:10.1063/1.3545273, 2011.; Boers, N., Bookhagen, B., Marwan,...

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Denoising Gravity and Geomagnetic Signals from Etna Volcano (Italy...

By: F. Greco; G. Nunnari; R. Napoli; C. Del Negro

Description: Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Italy. Multivariate methods were applied to denoise the gravity and geomagnetic signals continuously recorded by the permanent monitoring networks on the Etna volcano. Gravity and geomagnetic signals observed in volcanic areas are severely influenced by meteorological variables (i.e. pressure, temperature and humidity), whose disturbances can make the detection of volcanic source effect...

Andò, B. and Carbone, D.: A methodology for reducing a continuously recording gravity meter for the effect of meteorological parameters, IEEE Trans. Instrum. Meas., 50(5), 1248–1254, 2001.; Andò, B. and Carbone, D.: A test on a Neuro-Fuzzy algorithm used to reduce continuous gravity records for the effect of meteorological parameters, Phys. Earth Planet. Int., 142, 37–47, 2004.; Andò, B. and Carbone, D.: A new computational approach to reduce the signal from continuously...

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Limits and Characteristics of the Multifractal Behaviour of a High...

By: J. Olsson

Description: Department of Water Resources Engineering, Lund Institute of Technology, Lund University, Box 118, 221 00 Lund, Sweden. The multifractal properties of a 2-year time series of 8-min rainfall intensity observations are investigated. The empirical probability distribution function suggests a hyperbolic intermittency with divergence of moment of order greater than 2. The power spectrum E(f) of the series obeys a power law form E(f)=f

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Asymmetry of Wind Waves Studied in a Laboratory Tank : Volume 2, I...

By: D. J. McLaughlin; R. H. Mellen; M. A. Donelan; I. A. Leykin

Description: Northeastern University, Boston, MA 02115, USA. Asymmetry of wind waves was studied in laboratory tank tinder varied wind and fetch conditions using both bispectral analysis of wave records and third-order statistics of the surface elevation. It is found skewness S (the normalized third-order moment of surface elevation describing the horizontal asymmetry waves) varies only slightly with the inverse wave u*/Cm (where u* i...

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Topographic Instability of Flow in a Rotating Fluid : Volume 13, I...

By: V. O. Kakhiani; K. I. Patarashvili; Z. J. Tsakadze; M. V. Kalashnik; J. I. Nanobashvili; R. J. Chanishvili; M. A. Zhvania

Description: E. Andronikashvili Institute of Physics, 6 Tamarashvili str.,Tbilisi 0171, Georgia. Here are presented the results of experimental and theoretical studies on a stability of zonal geostrophic flows in the rotating layer of the shallow water. In the experiments, a special apparatus by Abastumani Astrophysical Observatory Georgian Academy of Science was used. This apparatus represents a paraboloid of rotation, which can be set in a regulable rotation around...

Danilov, S. D. and Sazonov, I. A.: Calculation of a zonal source-sink flow in a rotating basin, Izv. Acad. Sci. Russia, Atmos. Ocean. Phys., 35, 344–355, 1999.; Dikii, L. A.: Hydrodynamic stability and dynamics of the atmosphere, Gidrometeoizdat, Leningrad, 1976.; Doljanski, F. V., Krimov, V. A., and Manin, D. U.: A stability and vortex structure of quasi-dimensional shear flows, Sov.Phys. Uspekhi, 160, 1–47, 1990.; Nezlin, M. V. and Snejkin, E. N.: Rossby vortices and s...

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Granular Flow in Equilibrium with the Bottom: Experimental Analysi...

By: A. Lamberti; B. Zanuttigh

Description: DISTART - Universitá di Bologna Viale del Risorgimento 2, 40136 BOLOGNA, Italy. The paper presents measurements performed on the granular flow that develops in a drum partially filled with sand grains and rotating at various speeds. The aims of the paper are: to provide experimental evidence and measurements on grain flow in a drum; to compare theoretical and experimental velocity profiles; to point out discrepancies among theory and expe...

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Statistical Analysis of Stromboli Vlp Tremor in the Band [0.1–0.5]...

By: M. Palo; M. Falanga; S. De Martino; E. De Lauro

Description: Dipartimento di Fisica, Salerno University, via S. Allende, I-84081 Baronissi (SA), Italy. We analyze time series of Strombolian volcanic tremor, focusing our attention on the frequency band [0.1–0.5] Hz (very long period (VLP) tremor). Although this frequency band is largely affected by noise, we evidence two significant components by using Independent Component Analysis with the frequencies, respectively, of ~0.2 and ~0.4 Hz. We show that these compon...

Acernese, F., Ciaramella, A., De Martino, S., Falanga, M., and Tagliaferri, R.: Neural Networks for blind sources separation of Stomboli explosion quakes, IEEE Trans. Neural Netws., 14, 167–175, 2003.; Acernese, F., Ciaramella, A., De Martino, S., Falanga, M., Godano, C., and Tagliaferri, R.: Polarisation analysis of the independent components of low frequency events at Stromboli volcano (Eolian Island, Italy), J. Volc. Geotherm. Res., Special Issue: an introduction, edi...

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Mirror Mode Structures and Elf Plasma Waves in the Giacobini-zinne...

By: R. D. Zwickl; G. S. Lakhina; B. Buti; B. T. Tsurutani; S. L. Moses; E. J. Smith; A. L. Brinca; F. V. Coroniti; J. A. Slavin

Description: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA. We show evidence for mirror mode structures at comet Giacobini-Zinner. These are plasma structures with alternating high ß and low ß regions driven unstable when ß /ß > 1+ 1/. These structures are detected in a region just adjacent to the magnetic tail and have scale sizes of ≈ 12 H2O group ion cyclotron ra...

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Energy Transformations and Dissipation of Nonlinear Internal Waves...

By: J. N. Moum; J. D. Nash; E. L. Shroyer

Description: College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA. The energetics of large amplitude, high-frequency nonlinear internal waves (NLIWs) observed over the New Jersey continental shelf are summarized from ship and mooring data acquired in August 2006. NLIW energy was typically on the order of 105 Jm−1, and the wave dissipative loss was near 50 W m−1. However, wave energies (dissipations)...

Apel, J. R., Holbrook, J. R., Liu, A. K., and Tsai, J. J.: The {S}ulu {S}ea Internal Soliton Experiment, J. Phys. Ocean., 15, 1625–1651, 1985.; Brickman, D. and Loder, J. W.: Energetics of the Internal Tide on Northern Georges Bank, J. Phys. Ocean., 23, 409–424, 2.0.CO;2>doi:10.1175/1520-0485(1993)023<0409:EOTITO>2.0.CO;2, 1993.; Chang, M.-H., Lein, R.-C., Tang, T. Y., D'Asaro, E. A., and Yang, Y. J.: E...

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An Extension of Conditional Nonlinear Optimal Perturbation Approac...

By: Q. Wang; W. Duan; M. Mu; R. Zhang

Description: Key Laboratory of Ocean Circulation and Wave, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China. The approach of conditional nonlinear optimal perturbation (CNOP) was previously proposed to find the optimal initial perturbation (CNOP-I) in a given constraint. In this paper, we extend the CNOP approach to search for the optimal combined mode of initial perturbations and model parameter perturbations. This optimal combined mode, ...

Aanonsen, S. I.: Efficient history matching using a multiscale technique, SPE Reservoir Evaluation and Engineering, 154–164, February 2008.; Birgin, E. G., Martinez, J. M., and Raydan, M.: Nonmonotone spectral projected gradient methods on convex sets, SIAM J. Optimiz., 10, 1196–1211, 2000.; Chu, P. C., Lu, S. H., and Chen, Y. C.: Two kinds of predictability problems in Lorenz system and climate models, Second Hayes Symposium on Seasonal to Interannual Climate Variabilit...

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Nonlinear Waves and Solitons Propagating Perpendicular to the Magn...

By: K. Sauer; G. Chanteur; J. F. McKenzie; E. M. Dubinin

Description: Max-Planck Institut für Aeronomie, Katlenburg-Lindau, Germany. We investigate the nature of nonlinear waves propagating transverse to the magnetic field in a bi-ion plasma including plasma pressure. By using the conservation laws derived from the multi-ion fluid equations the system may be described by a single order differential equation whose properties control the structure of the flow and the magnetic field. Compressive solitons exist...

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Integrable Unsteady Motion with an Application to Ocean Eddies : V...

By: B. L. Lipphardt, Jr.; A. D. Kirwan, Jr.

Description: Center for Coastal Physical Oceanography, Old Dominion University, Norfolk, VA 23529, USA. Application of the Brown-Samelson theorem, which shows that particle motion is integrable in a class of vorticity-conserving, two-dimensional incompressible flows, is extended here to a class of explicit time dependent dynamically balanced flows in multilayered systems. Particle motion for nonsteady two-dimensional flows with discontinuities in the vorticity or pot...

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Anomalies of Critical State in Fracturing Geophysical Objects : Vo...

By: V. S. Kuksenko; V. S. Smirnov; N. G. Tomilin; A. Chmel

Description: Ioffe Physico-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia. Non-linear time-sequences of fracture-related events were studied in drifting sea-ice and fracturing rock. A reversible drop of the b-value was detected prior to the large-scale sea-ice cover fragmentation, when the time sequence of impact interactions between ice-fields was fully decorrelated. A similar loss of the temporal invariance of the fracture process w...

Amitrano, D.: Rupture by damage accumulation in rocks, Intern. J. Fracture, 139, 369–381, 2006.; Bouchaud, E.: Scaling properties of cracks, J. Phys. Cond. Matter, 9, 4319–4344, 1997.; Botvina, L. R.: Kinetic similarity of fracture processes on various scale levels, Intern. J. Fracture, 128, 133–138, 2004.; Caldarelli, G., Di Tolla, F. D., and Petri, A.: Self-organization and annealed disorder in a fracturing process, Phys. Rev. Lett., 77, 2503–2506, 1996.; Chmel, A.: Th...

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Approximate Asymptotic Integration of a Higher Order Water-wave Eq...

By: A. R. Osborne

Description: Dipartimento di Fisica Generale dell' Università, Via Pietro Giuria 1, Torino 10125, Italy. The complete mathematical and physical characterization of nonlinear water wave dynamics has been an important goal since the fundamental partial differential equations were discovered by Euler over 200 years ago. Here I study a subset of the full solutions by considering the irrotational, unidirectional multiscale expansion o...

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