Results 21 to 30 of about 4,854 (294)

Detection of Daily Precipitation Structure in Shiraz Synoptic Station [PDF]

نشریه جغرافیا و برنامه‌ریزی, 2020
Introduction Recently, issues raised by changes in precipitation, especially problems brought about by floods and droughts, along with the environmental effects of diminished rainfall, have underscored the importance of precipitation studies at different
mahdi narangifard, mehran fatemi, abdolali kamaneh, mohammad sadegh talebi   +3 more
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Geometric Representations of Interacting Maps

International Journal of Mathematics and Mathematical Sciences, 2010
Tropical geometry is a kind of dynamical scale transform which connects automata with real rational dynamics. Real rational dynamics are deeply studied from global analytic viewpoints.
Tsuyoshi Kato
doaj   +1 more source

A new form of the Saint-Venant equations for variable topography [PDF]

Hydrology and Earth System Sciences, 2020
The solution stability of river models using the one-dimensional (1D) Saint-Venant equations can be easily undermined when source terms in the discrete equations do not satisfy the Lipschitz smoothness condition for partial differential equations ...
C.-W. Yu, B. R. Hodges, F. Liu
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Optical tomography of the aurora and EISCAT [PDF]

Annales Geophysicae, 1998
Tomographic reconstruction of the three-dimensional auroral arc emission is used to obtain vertical and horizontal distributions of the optical auroral emission.
H. U. Frey, H. U. Frey, S. Frey, S. Frey, B. S. Lanchester, M. Kosch   +5 more
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Enumerative real algebraic geometry [PDF]

, 2003
Enumerative Geometry is concerned with the number of solutions to a structured system of polynomial equations, when the structure comes from geometry. Enumerative real algebraic geometry studies real solutions to such systems, particularly a priori information on their number. Recent results in this area have, often as not, uncovered new and unexpected
openaire   +2 more sources

A zero-dimensional approach to compute real radicals [PDF]

Computer Science Journal of Moldova, 2008
The notion of real radicals is a fundamental tool in Real Algebraic Geometry. It takes the role of the radical ideal in Complex Algebraic Geometry. In this article I shall describe the zero-dimensional approach and efficiency improvement I have found ...
Silke J. Spang
doaj  

Bundles over Quantum RealWeighted Projective Spaces

Axioms, 2012
The algebraic approach to bundles in non-commutative geometry and the definition of quantum real weighted projective spaces are reviewed. Principal U(1)-bundles over quantum real weighted projective spaces are constructed.
Tomasz Brzeziński, Simon A. Fairfax
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Some Applications of Casorati Curvature for Statistical Submanifolds of Sasakian Statistical Manifolds and Locally Homogeneous, Quasi-Umbilical Hypersurfaces

پژوهش‌های ریاضی, 2021
In this paper, in the first part, the affine geometry is assumed as the main framework. Then we have a spacious explanation of necessary introduction in rather different subjects.
Azam Etemad Dehkordy
doaj  

On Non-Commutative Multi-Rings with Involution

Mathematics
The primary motivation for this work is to develop the concept of Marshall’s quotient applicable to non-commutative multi-rings endowed with involution, expanding upon the main ideas of the classical case—commutative and without involution—presented in ...
Kaique M. A. Roberto, Kaique R. P. Santos, Hugo Luiz Mariano   +2 more
doaj   +1 more source

Spatial reasoning with augmented points: Extending cardinal directions with local distances

Journal of Spatial Information Science, 2012
We present an approach for supplying existing qualitative direction calculi with a distance component to support fully fledged positional reasoning. The general underlying idea of augmenting points with local reference properties has already been applied
Reinhard Moratz, Jan Oliver Wallgrün
doaj   +1 more source