Results 51 to 60 of about 1,087 (163)
An Introduction to Space–Time Exterior Calculus
Mathematics, 2019 The basic concepts of exterior calculus for space−time multivectors are presented: Interior and exterior products, interior and exterior derivatives, oriented integrals over hypersurfaces, circulation and flux of multivector fields.
Ivano Colombaro +2 more
doaj +1 more source
Analytical Frameworks and Theories of Electric Power in Non‐Linear Circuits
IET Generation, Transmission &Distribution, Volume 20, Issue 1, January/December 2026.Based on the challenges of distorted currents and non‐linear components in modern power grids, this article reviews seminal electrical power theories that seek to generalize the traditional definitions of active, reactive, and apparent power. It provides a detailed analysis of their mathematical foundations, practical implementation, and validity.
Rafael Escudero, Luis Ibarra
wiley +1 more source
An Approach to the Multivectorial Apparent Power in Terms of a Generalized Poynting Multivector [PDF]
, 2009 The purpose of this paper is to explain an exact derivation of apparent power in n-sinusoidal operation founded on electromagnetic theory, until now unexplained by simple mathematical models.
Bravo-Rodríguez, Juan Carlos +3 more
core +1 more source
IET Power Electronics, Volume 19, Issue 1, January/December 2026.This paper investigates the quasi‐steady‐state instantaneous power flows (QSS‐IPFs) in voltage source converter (VSC) grid‐connected systems along the analytical path of indicator definition, mechanism characterisation and device‐level optimisation.
Yuhang Guan +3 more
wiley +1 more source
Application of a Multidimensional Approach in the Compensation of Industrial Loads
IEEE AccessThe instantaneous reactive power theory (IRPT) has long been utilized for load compensation through active power line conditioners (APLCs). IRPT effectively divides the current vector into two components: the instantaneous power current and the ...
Patricio Salmeron +3 more
doaj +1 more source
Applied Computational Intelligence and Soft Computing, Volume 2026, Issue 1, 2026.Intrusion detection systems (IDS) play an important role as a frontline defense in the ongoing effort to secure our networks. But how can we be sure they are effective? It all comes down to the data they were tested on. The review takes a close look at the research landscape by breaking down studies based on five of the most widely used datasets: NSL ...
H. A. El Shenbary +5 more
wiley +1 more source
MULTI-VECTOR DIVERSIFICATION: KAZAKHASTAN´S TRANSNATIONAL FUTURE
Revista UNISCI, 2017 The recent election of the Republic of Kazakhstan as a non-permanent member of the UN Security Council gives the country an opportunity to participate more directly in shaping regional and global energy, economics, and security.
Elvira Aidarkhanova +3 more
doaj +1 more source
Iron Oxides for High‐Temperature‐Integrated Energy Storage Systems
Advances in Materials Science and Engineering, Volume 2026, Issue 1, 2026.Thermodynamic equilibrium simulations using Aspen Plus delineate the iron–steam redox cycle operational envelope (843–1323 K), quantifying iron conversion (Fe/Fetotal), reaction enthalpy (ΔHR), and pH2/pH2O ratios. Temperature progressively lowers minimum pH2/pH2O for metallic iron formation—from > 5.0 at 843 K to ∼0.8 above 1100 K—while oxidation ...
Julien Göthel +2 more
wiley +1 more source
Influence of integration on development of subjects of the agrarian sector of economy
Agricultural and Resource Economics, 2018 Purpose. The purpose of article is to characterize theoretical aspects of development of integration processes in agricultural sector and the integrated agrarian formations; to reveal individual factors of influence on integration processes and to review
Igor Kutsenko
doaj
3D Cadastral Data Model Based on Conformal Geometry Algebra
ISPRS International Journal of Geo-Information, 2016 Three-dimensional (3D) cadastral data models that are based on Euclidean geometry (EG) are incapable of providing a unified representation of geometry and topological relations for 3D spatial units in a cadastral database. This lack of unification causes
Ji-yi Zhang +5 more
doaj +1 more source