Results 81 to 90 of about 4,773,304 (208)

Convergence and divergence in living standards among regions of the enlarged European Union (1992-2006) [PDF]

This paper examines regional convergence in living standards among 264 EU27 regions during1992-2006. The main contribution is the exploratory analysis, which inspects various aspects of regional dynamics such as convergence and divergence, polarization ...
Novotný, JOSEF
core  

One-hour-ahead forecasting of ionogram morphology and spread-F signatures using a spatial group-wise enhanced ConvTransformer

Journal of Space Weather and Space Climate
The Digisonde Portable Sounder (DPS) ionosonde at Hainan Station (19.5°N, 109.1°E; magnetic latitude: 11°N) has been monitoring ionospheric conditions since 2002, routinely recording ionospheric plasma profiles, sporadic E layers, and Spread-F structures
Cai Jinhui, Gao Pengdong, Wang Zheng, Wang Bo, Wang Guojun, Qi Quan, Qiu Chu, Ye Yudong, Shi Jiankui, Wang Xiao   +9 more
doaj   +1 more source

Sigma-Convergence Versus Beta-Convergence: Evidence from U.S. County-Level Data [PDF]

In this paper we outline (i) why ó-convergence may not accompany â- convergence, (ii)cite evidence of â-convergence in the U.S., (iii) and use USA county-level data containing over 3,000 cross-sectional observations to demonstrate that ó-convergence does
Daniel Levy, Matthew Higgins, Andrew Young   +2 more
core   +2 more sources

CONVERGENCE OF MARKOV CHAIN APPROXIMATIONS TO STOCHASTIC REACTION DIFFUSION EQUATIONS [PDF]

In the context of simulating the transport of a chemical or bacterial contaminant through a moving sheet of water, we extend a well established method of approximating reaction-diffusion equations with Markov chains by allowing convection, certain ...
Michael A. Kouritzin, Hongwei Long
core  

Spatial Clustering, Inequality and Income Convergence [PDF]

This paper examines the relationship between spatial clustering and inequality at the county scale with overall state per capita income in the U.S. over the period 1969-2000.
Mark V. Janikas, Sergio J. Rey
core  

Controlling Convergence of Space-Mapping Algorithms for Engineering Optimization

, 2008
—The problem of convergence properties of space mapping optimization algorithms is addressed. A new weighting scheme in the parameter extraction procedure is introduced that allows us to control the behavior of the space mapping algorithm and force it to
Life Fellow, Slawomir Koziel, Senior Member, John W. B   +3 more
core  

Iris: Deep Space Small Satellite Radio [PDF]

, 2017
With nanosatellites being used for deep space missions, the need for a unique communications architecture to relay valuable mission data back to NASA’s Deep Space Network (DSN) is ...
Space Dynamics Laboratory
core   +1 more source

On \(\nabla\)-statistical convergence in random 2-normed space

Journal of Numerical Analysis and Approximation Theory, 2014
Recently in [19], Mursaleen introduced the concepts of statistical convergence in random 2-normed spaces. In this paper, we define and study the notion of \(\nabla\)-statistical convergence and \(\nabla \)-statistical Cauchy sequences by using \(\lambda\
Ayhan Esi
doaj   +2 more sources

A new Concept of Convergence Space

, 2008
The notion of b-convergence is presented for studying preuniform convergence spaces in the sense of Preuß (1993) and set-convergence spaces introduced by Wyler in 1989 from a common point of view. The well-known supertopologies as defined by Doitchinov in 1964 and also the filtermerotopies in the sense of Kat´etov (1965) can be integrated as well. Even
openaire   +2 more sources

On Connected Subsets of a Convergence Space

International Journal of Topology
Though a convergence space is connected if and only if its topological modification is connected, connected subsets of a convergence space differ from those of its topological modification. We explore which subsets exhibit connectedness for the convergence or for the topological modification.
Bryan Gerardo Castro Herrejón, Frédéric Mynard   +1 more
openaire   +2 more sources