World Library  


 
  • Cover Image

Nonlinear Saturation of Rayleigh-taylor Instability and Generation...

By: G. S. Lakhina; N. Chakrabarti

Description: Indian Institute of Geomagnetism, Dr. Nanabhai Moos marg, Colaba, Mumbai 400 005, India. An analysis of low order mode coupling equations is used to describe the nonlinear behaviour of the Rayleigh-Taylor (RT) instability in the equatorial ionosphere. The nonlinear evolution of RT instability leads to the development of shear flow. It is found that there is an interplay between the nonlinearity and the shear flow which compete with each o...

Read More
  • Cover Image

Conjugate Flows and Amplitude Bounds for Internal Solitary Waves :...

By: J. L. Maltseva; A. Yu. Kazakov; N. I. Makarenko

Description: Lavrentyev Institute of Hydrodynamics 630090, Novosibirsk, Russia. Amplitude bounds imposed by the conservation of mass, momentum and energy for strongly nonlinear waves in stratified fluid are considered. We discuss the theoretical scheme which allows to determine broadening limits for solitary waves in the terms of a given upstream density profile. Attention is focused on the continuously stratified flows having multiple broadening limits. The role...

Amick, C. and Turner, R. E. L.: A global theory of internal solitary waves in two-fluid system, Trans. Amer. Math. Soc., 298, 431–484, 1986.; Benjamin, T. B.: Internal waves of finite amplitude and permanent form, J.Fluid Mech., 25, 241–270, 1966.; Benjamin, T. B.: A unified theory of conjugate flows, Philos. Trans. Roy. Soc. London A., 269, 587–643, 1971.; Benjamin, T B.: Impulse, flow force and variational principles, IMA J. Appl. Math., 32, 3–68, 1984.; Benney, D. J. ...

Read More
  • Cover Image

Double Rank-ordering Technique of Roma (Rank-ordered Multifractal ...

By: T. Chang; S. W. Y. Tam

Description: Institute of Space, Astrophysical and Plasma Sciences, National Cheng Kung University, Tainan, Taiwan. Rank-Ordered Multifractal Analysis (ROMA), a technique capable of deciphering the multifractal characteristics of intermittent fluctuations, was originally applied to the results of a magnetohydrodynamic (MHD) simulation. Application of ROMA to measured fluctuations in the auroral zone, due to the dominant physical effects changing from kinetic to MHD ...

Burlaga, L.: Intermittent turbulence in the solar wind, J. Geophys. Res., 96, 5847–5851, 1991.; Bruno, R., Carbone, V., Veltri, P., Pietropaolo, E., and Bavassano, B.: Identifying intermittent events in the solar wind, Planet. Space Sci., 49, 1201–1210, 2001.; Chang, T., Tam, S. W. Y., and Wu, C. C.: Complexity induced anisotropic bimodal intermittent turbulence in space plasmas, Phys. Plasmas, 11, 1287–1299, 2004.; Chang, T.: Colloid-like behavior and topological phase ...

Read More
  • Cover Image

The Transient Variation in the Complexes of the Low-latitude Ionos...

By: I. A. Fuwape; J. A. Laoye; B. O. Ogunsua; A. B. Rabiu

Description: Space Physics Laboratory, Department of Physics, Federal University of Technology, Akure, Nigeria. The quest to find an index for proper characterization and description of the dynamical response of the ionosphere to external influences and its various internal irregularities has led to the study of the day-to-day variations of the chaoticity and dynamical complexity of the ionosphere. This study was conducted using Global Positioning System (GPS) total ...

Abdu, M. A.: Major Phenomena of the equatorial ionosphere thermosphere system under disturbed conditions, J. Atmos. Solten Phys., 59, 1505–1519, 1997.; Anastasiadis, A., Costa, L., Gonzáles, C., Honey, C., Széliga, M., and Terhesiu, D.: Measures of Structural Complexity in Networks, Complex Systems Summer School 2005, Santa Fe, 2005.; Baillie, R. and Chung, S.: Modeling and forecasting from trend stationary long memory models, with applications in climatology, Int. J. Fo...

Read More
  • Cover Image

Multiple Equilibria and Oscillatory Modes in a Mid-latitude Ocean-...

By: E. Simonnet; M. Ghil; B. Deremble

Description: Florida State University, 117 N. Woodward Ave., Tallahassee, FL 32306-4320, USA. Atmospheric response to a mid-latitude sea surface temperature (SST) front is studied, while emphasizing low-frequency modes induced by the presence of such a front. An idealized atmospheric quasi-geostrophic (QG) model is forced by the SST field of an idealized oceanic QG model. First, the equilibria of the oceanic model and the associated SST fronts are computed. Nex...

Arakawa, A.: Computational design for long-term numerical integrations of the equations of atmospheric motion, J. Comput. Phys., 1, 119–143, 1966.; Battisti, D. S., Sarachik, E. S., and Hirst, A. C.: A Consistent Model for the Large-Scale Steady Surface Atmospheric Circulation in the Tropics., J. Climate, 12, 2956–2964, 2.0.CO;2>doi:10.1175/1520-0442(1999)012<2956:ACMFTL>2.0.CO;2, 1999.; Bellon, G., Le ...

Read More
  • Cover Image

Characteristics of Quasi-static Potential Structures Observed in t...

By: T. Johansson; M. André; S. Buchert; L. M. Kistler; P.-a. Lindqvist; A. Fazakerley; G. T. Marklund; T. Karlsson; S. Figueiredo

Description: Division of Plasma Physics, Alfvén Laboratory, Royal Institute of Technology, SE 10044 Stockholm, Sweden. Temporal and spatial characteristics of intense quasi-static electric fields and associated electric potential structures in the return current region are discussed using Cluster observations at geocentric distances of about 5 Earth radii. Results are presented from four Cluster encounters with such acceleration structures to illustrate common as wel...

Read More
  • Cover Image

A Kalman Filter Application to a Spectral Wave Model : Volume 12, ...

By: A. Pires Silva; M. C. Bernadino; J. P. Pinto

Description: Marinha, Instituto Hidrográfico, Portugal. A sequential time dependent data assimilation scheme based on the Kalman filter is applied to a spectral wave model. Usually, the first guess covariance matrices used in optimal interpolation schemes are exponential spreading functions, which remain constant. In the present work the first guess correlation errors evolve in time according to the dynamic constraints of the wave model. A system error noise is dedu...

Read More
  • Cover Image

Application of Wavelet Transform for Evaluation of Hydrocarbon Res...

By: H. Hassani; M. R. Saadatinejad

Description: Amirkabir University of Technology, Mining, Metallurgical and Petroleum Engineering, Tehran, I. R. Iran. The Persian Gulf and its surrounding area are some of the biggest basins and have a very important role in producing huge amounts of hydrocarbon, and this potential was evaluated in order to explore the target for geoscientists and petroleum engineers. Wavelet transform is a useful and applicable technique to reveal frequency contents of various signa...

Abdollahie Fard, I., Braathen, A., Mokhtari, M., and Alavi., A.: Interaction of the Zagros fold-thrust belt and Arabian-type, deep-seated folds in the Abadan plain and the Dezful embayment, SW Iran, Petrol. Geosci., 12, 347–362, 2006.; Burnett, M. D. and Castagna, J. P.: Advances in spectral decomposition and reflectivity modeling in the Frio formation of the Gulf Coast, Search and Discovery, 40113,

Read More
  • Cover Image

Generation of Zonal Flows by Rossby Waves in the Atmosphere : Volu...

By: P. K. Shukla; R. Z. Sagdeev; O. A. Pokhotelov; L. Stenflo; O. G. Onishchenko

Description: Institute of Physics of the Earth, 12 3810 Moscow, 10 B. Gruzinskaya Str., Russia. A novel mechanism for the short-scale Rossby waves interacting with long-scale zonal flows in the Earth's atmosphere is studied. The model is based on the parametric excitation of convective cells by finite amplitude Rossby waves. We use a set of coupled equations describing the nonlinear interaction of Rossby waves and zonal flows which admits the excitation of zonal flo...

Read More
  • Cover Image

Asymmetric Tide in Lake Vallunden (Spitsbergen) : Volume 20, Issue...

By: E. G. Morozov; A. V. Marchenko

Description: Svalbard University Center, Longyearbyen, Spitsbergen, Norway. We observed strongly asymmetric tide in a channel connecting the Van Mijen Fjord and Lake Vallunden in Spitsbergen. The channel is approximately 100 m long, 10 m wide, and 1–2 m deep. Asymmetric tide was also observed in the lake. The form of the semidiurnal tide is described by a combination of only three harmonics (M2, S2 and M4) with di...

Aubrey, D. G. and Speer, P. E.: A study of non-linear tidal propagation in shallow inlet/estuarine systems, Part I: Observations, Estuarine, Coast. Shelf Sci., 21, 185–205, 1985.; Boon, J. D. and Byrne, R. J.: On basin hypsometry and the morphodynamic response of coastal inlets, Marine Geol., 40, 27–48, 1981.; Blanton, J. O., Lin, G. Q., and Elston, S. A.: Tidal current asymmetry in shallow estuaries and tidal creeks, Cont. Shelf Res., 22, 1731–1743, 2002.; Caline, F.: C...

Read More
  • Cover Image

On Aspects of the Measurement of Non-linear Turbulence Processes U...

By: V. V. Krasnosel'Skikh; T. Dudok De Wit; M. A. Balikhin; L. J. C. Wooliscroft

Description: Department of Automatic Control and Systems Engineering, The University of Sheffield, Sheffield, S1 3JD, UK. The ESA/NASA Cluster mission has four identical satellites and is due for launch at the end of 1995. It will provide a unique opportunity to study medium scale processes in the region from inside the magnetopause to the solar wind. The polar orbit will allow measurements in the cusp and along auroral field lines,...

Read More
  • Cover Image

Using Earthquake Intensities to Forecast Earthquake Occurrence Tim...

By: J. B. Rundle; K. F. Tiampo; J. R. Holliday; D. L. Turcotte

Description: Computational Science and Engineering Center, University of California, Davis, USA. It is well known that earthquakes do not occur randomly in space and time. Foreshocks, aftershocks, precursory activation, and quiescence are just some of the patterns recognized by seismologists. Using the Pattern Informatics technique along with relative intensity analysis, we create a scoring method based on time dependent relative operating characteristic diagrams an...

Burridge, R. and Knopoff, L.: Model and theoretical seismicity, Bull. Seism. Soc. Am., 57, 341–371, 1967.; Carlson, J. M., Langer, J. S., and Shaw, B. E.: Dynamics of earthquake faults, Rev. Mod. Phys., 66, 657–670, 1994.; Chen, K., Bak, P., and Obukhov, S. P.: Self-organized criticality in a crack-propagation model of earthquakes, Phys. Rev. A, 43, 625–630, 1991.; Chung, J. W.: Utility and Production Functions, Blackwell, Oxford, 1994.; Fisher, D. S., Dahmen, K., Ramana...

Read More
  • Cover Image

A Theoretical Model of a Wake of a Body Towed in a Stratified Flui...

By: D. A. Sergeev; V. V. Papko; O. A. Druzhinin; G. N. Balandina; Y. I. Troitskaya

Description: Institute of Applied Physics, Nizhny Novgorod, Russian Federation, Russia. The objective of the present paper is to develop a theoretical model describing the evolution of a turbulent wake behind a towed sphere in a stably stratified fluid at large Froude and Reynolds numbers. The wake flow is considered as a quasi two-dimensional (2-D) turbulent jet flow whose dynamics is governed by the momentum transfer from the mean flow to a quasi-2-D sinuous mode ...

Fincham, A. M. and Spedding, G. R.: Low–cost, high–resolution DPIV for turbulent flows, Exps.Fluids., 23, 449–462, 1997.; Balandina, G. N., Papko, V. V., Sergeev, D. A., and Troitskaya, Y. I.: Evolution of the far turbulent wake behind a body towed in stratified fluid with large Reynolds and Froude numbers, Izv. Atmos. Oceanic Phys., 40(1), 99–113, 2004.; Bonneton, P., Chomaz, J. M., and Hopfinger, E. J.: Internal waves produced by the turbulent wake of a sphere moving h...

Read More
  • Cover Image

Preface : Volume 9, Issue 5/6 (30/11/-0001)

Read More
  • Cover Image

The Role of Nonlinear Landau Damping and the Bounced Motion of Pro...

By: P. H. Diamond; M. Prakash

Description: Department of Physics and Astronomy, SUNY at Stony Brook, NY 11794-3800, USA. The present work examines the effects arising from the nonlinear Landau damping and the bounced motion of protons (trapped in the mirror geometry of the geomagnetic field) in the formation of nonlinear Alfvénic structures. These structures are observed at distances 1-5AU in the solar wind plasma (with ß ~ 1). The dynamics of formation of these structures can be understo...

Read More
  • Cover Image

Intermittent Chaos Driven by Nonlinear Alfvén Waves : Volume 11, I...

By: A. J. Preto; A. C.-l. Chian; S. Stephany; E. L. Rempel

Description: National Institute for Space Research (INPE) and World Institute for Space Environment Research (WISER), P.O. Box 515, São José dos Campos, SP-12227-010, Brazil. We investigate the relevance of chaotic saddles and unstable periodic orbits at the onset of intermittent chaos in the phase dynamics of nonlinear Alfvén waves by using the Kuramoto-Sivashinsky (KS) equation as a model for phase dynamics. We focus on the role of nonattracting chaotic solutions o...

Read More
  • Cover Image

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...

Read More
  • Cover Image

External Forcing of Earthquake Swarms at Alpine Regions: Example f...

By: H. Küchenhoff; J. Wassermann; L. Fahrmeir; V. Svejdar

Description: Department of Statistics, Ludwig-Maximilians Univ. Munich, Germany. In the last few years, it has been shown that above-average rainfall and the following diffusion of excess water into subsurface structures is able to trigger earthquake swarms in the uppermost brittle portion of the Earth's crust. However, there is still an ongoing debate on whether the crust already needs to be in a critical-to-failure state or whether it is sufficient that water is ...

Agnew, D. C.: SPOTL: Some programs for ocean-tide loading, SIO Ref. Ser. 96-8, 35 pp., Scripps Institution of Oceanography, La Jolla, CA, 1996.; Ben-Zion Y. and Leary, P.: Thermoelastic strain in a half-space covered by unconsolidated material, BSSA, 76, 1447–1460, 1986.; Akaike, H.: Information theory and an extension of the maximum likelihood principle, in: 2nd International Symposium on Information Theory, edited by: Ptrov, B. N. and Csaki, F., Budapest, 276–81, 1973....

Read More
  • Cover Image

The Concept of Exchangeability in Ensemble Forecasting : Volume 18...

By: H. Kantz; J. Bröcker

Description: Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, 01187 Dresden, Germany. A set of random variables is exchangeable if its joint distribution function is invariant under permutation of the arguments. The concept of exchangeability is discussed, with a view towards potential application in evaluating ensemble forecasts. It is argued that the paradigm of ensembles being an independent draw from an underlying distribution function is pr...

Bröcker, J.: On reliability analysis of multi-categorical forecasts, Nonlin. Processes Geophys., 15, 661–673, doi:10.5194/npg-15-661-2008, 2008.; Hamill, T. M.: Interpretation of rank histograms for verifying ensemble forecasts, Mon. Weather Rev., 129(3), 550–560, 2001.; Hansen, J. A. and Smith, L. A.: Extending the limits of forecast verification with the minimum spanning tree, Mon. Weather Rev., 132(6), 1522–1528, 2004.; Hewitt, E. and Savage, L. J.: Symmetric measures...

Read More
  • Cover Image

Expectation-maximization Analysis of Spatial Time Series : Volume ...

By: A. L. Aretxabaleta; K. W. Smith

Description: Woods Hole Oceanographic Institution, Woods Hole, MA, USA. Expectation maximization (EM) is used to estimate the parameters of a Gaussian Mixture Model for spatial time series data. The method is presented as an alternative and complement to Empirical Orthogonal Function (EOF) analysis. The resulting weights, associating time points with component distributions, are used to distinguish physical regimes. The method is applied to equatorial Pacific sea su...

Belamari, S., Redelsperger, J.-L., and Pontaud, M.: Dynamic Role of a Westerly Burst in Triggering an Equatorial Pacific Warm Event, J. Climate, 16, 1869–1890, 2003.; Emery, W J. and Thomson, R E.: Data Analysis Methods in Physical Oceanography, Pergamon, pp 634, 1997.; Fraley, C. and Raftery, A.: Model Based Clustering, Discriminant Analysis, and Density Estimation., J. American Statistical Assoc., 97, 611–631, 2002.; Houseago-Stokes, R E. and Challenor, P G.: Using PPC...

Read More
 
1
|
2
|
3
Records: 1 - 20 of 45 - Pages: 



Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.