Results 71 to 80 of about 5,981 (227)

Multifractality in Human Heartbeat Dynamics

, 1999
Recent evidence suggests that physiological signals under healthy conditions may have a fractal temporal structure. We investigate the possibility that time series generated by certain physiological control systems may be members of a special class of ...
A-L Barabasi, C Meneveau, C-K Peng, C-K Peng, C-S Poon, G Sugihara, GB Moody, H Takayasu, HE Hurst, HE Stanley, HE Stanley, I Daubechies, J Lefebvre, JB Bassingthwaighte, JF Muzy, JF Muzy, JK Kanters, JM Hausdorff, LAN Amaral, M Kobayashi, M Malik, MF Shlesinger, PCh Ivanov, PCh Ivanov, S Akselrod, S Thurner, T Vicsek, T Vicsek, TG Dewey, Y Yamamoto   +29 more
core   +1 more source

Linking regional and global functional trait data: insights from mammal communities in a fragmented Atlantic Forest landscape

Oikos, EarlyView.
Accurate functional trait data are essential for understanding ecosystem services and processes in fragmented landscapes. We evaluated whether the global EltonTraits 1.0 database adequately represents the functional structure of mammal communities in forest fragments and restoration sites in a highly fragmented Atlantic Forest landscape.
Maria F. R. Godoi, Fábio Z. Farneda, Alan D. Pereira, Marcos Akira‐ Umeno, Fernanda C. Marques, Marcos Robalinho Lima   +5 more
wiley   +1 more source

The Simultaneous Interpolation of Target Radar Cross Section in Both the Spatial and Frequency Domains by Means of Legendre Wavelets Model-Based Parameter Estimation

International Journal of Aerospace Engineering, 2015
The understanding of the target radar cross section (RCS) is significant for target identification and for radar designing and optimization. In this paper, a numerical algorithm for calculating target RCS is presented which is based on Legendre wavelet ...
Yongqiang Yang, Yunpeng Ma, Lifeng Wang
doaj   +1 more source

The multi-fractal structure of contrast changes in natural images: from sharp edges to textures

, 2000
We present a formalism that leads very naturally to a hierarchical description of the different contrast structures in images, providing precise definitions of sharp edges and other texture components. Within this formalism, we achieve a decomposition of
Parga, N., Turiel, A.
core   +3 more sources

Temporal community change in stream ecosystems varies by assemblage across US climates

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Ecosystem properties are temporally dynamic. Temporal variability has been shown to decrease with increasing levels of biological organization (i.e. from population to community and ecosystem levels).
Megan C. Malish, Stephen C. Cook, Mariana Perez Rocha, Albert Ruhí, Michael T. Bogan, Thomas M. Neeson, Daniel C. Allen   +6 more
wiley   +1 more source

Application of Legendre wavelets for solving fractional differential equations

Computers & Mathematics with Applications, 2011
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jafari, H., Yousefi, S.A., Firoozjaee, M.A., Momani, S., Khalique, C.M.   +4 more
openaire   +1 more source

SOLUTION OF HIGHER ORDER VOLTERRA INTEGRO-DIFFERENTIAL EQUATIONS BY LEGENDRE WAVELETS [PDF]

International Journal of Apllied Mathematics, 2015
The numerical solution of \(m\)th-order nonlinear Volterra integro-differential equations with two-point boundary conditions is obtained by using a collocation method based on the Legendre wavelets. The collocation points are the zeros of the Chebyshev polynomials and the Gaussian integration formula is applied.
Chandel, Raghvendra S., Singh, Amardeep, Chouhan, Devendra   +2 more
openaire   +2 more sources

Mammalian herbivory indirectly shapes savanna arthropod communities but only at very low or high levels

Journal of Animal Ecology, EarlyView.
This study investigates how large mammalian herbivores shape arthropod communities in African savannas, using a broad gradient of herbivory types and intensities to assess these effects under real‐world, non‐experimental conditions. Abstract Savanna ecosystems support unique biodiversity and provide livelihoods for millions of people.
Bjoern Erik Matthies, Nicola Stevens, Jane K. Hill, Bosco Leturuka, Margaret Njuguna, Lucy K. Smyth, Matthew S. Rogan, Catherine W. Machungo, Jonathan E. M. Baillie, Jafford N. Rithaa, Catherine L. Parr   +10 more
wiley   +1 more source

Angular multiselectivity with spherical wavelets

, 2018
We construct spherical wavelets based on approximate identities that are directional, i.e. not rotation-invariant, and have an adaptive angular selectivity.
Iglewska-Nowak, Ilona
core   +1 more source

Eco‐evolutionary dynamics of partially migratory metapopulations in spatially and seasonally varying environments

Journal of Animal Ecology, EarlyView.
Partial seasonal migration is rarely considered in a metapopulation context. Here, Haaland et al. use an eco‐evolutionary model revealing how partially migratory metapopulations may arise and be maintained, and how seasonal migrants may cause effects of local extreme climatic events to percolate through metapopulations across diverging temporal and ...
Thomas R. Haaland, Ana Payo‐Payo, Paul Acker, Rita Fortuna, Sarah J. Burthe, Irja I. Ratikainen, Francis Daunt, Jane M. Reid   +7 more
wiley   +1 more source