Results 21 to 30 of about 166,841,558 (307)

Valuation of environmental public goods and services at different spatial scales: a review [PDF]

open access: yes, 2010
To manage environmental problems in an adequate way, it is essential to take different spatial scales into consideration. As a tool for decision making, it would be beneficial if valuation methods take spatial scales into account as well. In this article,
S. Uiterkamp, Anton,   +17 more
core   +2 more sources

Metric Based Upscaling for Partial Differential Equations with a Continuum of Scales [PDF]

open access: yes, 2007
Numerical upscaling of problems with multiple scale structures have attracted increasing attention in recent years. In particular, problems with non-separable scales pose a great challenge to mathematical analysis and simulation.
Zhang, Lei
core   +1 more source

A nonlinear model for vibro-acoustic analysis of a submerged axially moving cylindrical shell [PDF]

open access: yesمهندسی مکانیک شریف
Investigating the acoustic vibrations of moving cylindrical shells in fluid is of interest to researchers due to their many applications in marine structures.
A. H. Orafa, M.M. Jalili, A.R. Fotuhi
doaj   +1 more source

Treatment of multiple sclerosis in special populations: The case of refugees [PDF]

open access: yes, 2020
Multiple sclerosis was long considered a relatively rare entity in the Middle East, but research over the past 10 years and the publication of the Middle East North Africa Committee for Treatment and Research in Multiple Sclerosis guidelines for multiple
Yamout, Bassem I., Zeineddine, Maya M.
core   +1 more source

Hopf bifurcation analysis of scalar implicit neutral delay differential equation

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2018
Hopf bifurcation analysis is conducted on a scalar implicit Neutral Delay Differential Equation (NDDE) by means of the extension of two analytical methods: 1) center manifold reduction combined with normal form theory; 2) method of multiple scales.
Li Zhang, Gábor Stépán
doaj   +1 more source

Modelling multiple time-scales with flexible parametric survival models

open access: yesBMC Medical Research Methodology, 2022
Background There are situations when we need to model multiple time-scales in survival analysis. A usual approach in this setting would involve fitting Cox or Poisson models to a time-split dataset.
Nurgul Batyrbekova   +7 more
doaj   +1 more source

Adding a subjective dimension to an ICF-based disability measure for people with multiple sclerosis: development and use of a measure for perception of disabilities [PDF]

open access: yes, 2009
OBJECTIVE: The subjective dimension of disability, the perception of disability, is a dimension missing from the International Classification of Functioning, Disability and Health (ICF), and from health-related quality of life (HRQOL) instruments ...
Lok, W.S.   +7 more
core   +1 more source

NONLINEAR PRIMARY RESONANCE OF A CIRCULAR SANDWICH PLATE UNDER STATIC LOAD

open access: yesJixie qiangdu, 2021
Based on Reissner’s sandwich plate theory,the nonlinear dynamic equations of the circular sandwich plate under static load are established by using the Hamilton principle.
GUO Wei, DU GuoJun, HU YuDa
doaj  

Numerical manifold method modeling of coupled processes in fractured geological media at multiple scales

open access: yesJournal of Rock Mechanics and Geotechnical Engineering, 2020
The greatest challenges of rigorously modeling coupled hydro-mechanical (HM) processes in fractured geological media at different scales are associated with computational geometry.
Mengsu Hu, Jonny Rutqvist
doaj   +1 more source

A note on the method of multiple scales [PDF]

open access: yesQuarterly of Applied Mathematics, 1980
A modification of the method of multiple scales makes use of the expansion of parameters of the system in order to remove undesirable characteristics of the solution obtained by the usual multiple-scale method. When applied to the damped harmonic oscillator, the modification leads to the exact solution.
openaire   +1 more source

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