Results 21 to 30 of about 338,457 (200)

Polars of real singular curves [PDF]

open access: yes, 2008
Polar varieties have in recent years been used by Bank, Giusti, Heintz, Mbakop, and Pardo, and by Safey El Din and Schost, to find efficient procedures for determining points on all real components of a given non-singular algebraic variety. In this note we review the classical notion of polars and polar varieties, as well as the construction of what we
Mork, Heidi Camilla, Piene, Ragni
openaire   +3 more sources

Model Structure Optimization for Fuel Cell Polarization Curves

open access: yesComputers, 2018
The applications of evolutionary optimizers such as genetic algorithms, differential evolution, and various swarm optimizers to the parameter estimation of the fuel cell polarization curve models have increased.
Markku Ohenoja   +2 more
doaj   +1 more source

Common continuum polarization properties: a possible link between proto-planetary nebulae and Type Ia Supernovae progenitors

open access: yes, 2017
The lines-of-sight to highly reddened SNe Ia show peculiar continuum polarization curves, growing toward blue wavelengths and peaking at $\lambda_{max} \lesssim 0.4 \mu m$, like no other sight line to any normal Galactic star.
Cikota, Aleksandar   +4 more
core   +1 more source

Direct measurement of giant electrocaloric effect in BaTiO3 multilayer thick film structure beyond theoretical prediction [PDF]

open access: yes, 2010
The electrocaloric effect of BaTiO3 multilayer thick film structure was investigated by direct measurement and theoretical calculation. The samples were prepared by the tape-casting method, which had 180 dielectric layers with an average thickness of 1.4\
Bai, Yang   +2 more
core   +2 more sources

Polar transform and local positivity for curves [PDF]

open access: yesAnnales de la Faculté des sciences de Toulouse : Mathématiques, 2020
Using the duality of positive cones, we show that applying the polar transform from convex analysis to local positivity invariants for divisors gives interesting and new local positivity invariants for curves. These new invariants have nice properties similar to those for divisors.
McCleerey, Nicholas, Xiao, Jian
openaire   +3 more sources

Effective Parameter Extraction of Different Polymer Electrolyte Membrane Fuel Cell Stack Models Using a Modified Artificial Ecosystem Optimization Algorithm

open access: yesIEEE Access, 2020
Recently, extracting the precise values of unknown parameters of the polymer electrolyte membrane fuel cell (PEMFC) is considered one of the most widely nonlinear and semi-empirical optimization problems.
Ahmed S. Menesy   +5 more
doaj   +1 more source

Theoretical study of ferroelectric potassium nitrate

open access: yes, 2007
We present a detailed study of the structural behavior and polarization reversal mechanism in phase III of KNO$_3$, an unusual ferroelectric material in which the nitrate groups rotate during polarization reversal.
David Vanderbilt   +2 more
core   +1 more source

Investigation of the Electrochemical Reduction Process of the Molybdate Ions in the Tartaric Electrolytes

open access: yesActa Chimica Slovenica, 2019
The electrochemical reduction of molybdate ions in tartaric electrolyte has been investigated in this work. Kinetics and mechanism of the electrochemical process have been studied by cyclic and linear voltammetric polarization methods.
Vusala Asim Majidzade   +4 more
doaj   +1 more source

On the mean profiles of radio pulsars II: Reconstruction of complex pulsar light-curves and other new propagation effects

open access: yes, 2017
Our previous paper outlined the general aspects of the theory of radio light curve and polarization formation for pulsars. We predicted the one-to-one correspondence between the tilt of the linear polarization position angle of the and the circular ...
Beskin, Vasily   +2 more
core   +1 more source

Improvement of micro-hardness and electrochemical properties of Al-4%Cu-0.5%Mg alloy by Ag addition

open access: yesRevista Facultad de Ingeniería Universidad de Antioquia, 2012
The base system of alloys Al-4% Cu-0. 5% Mg, known as the designation of duralumin 201, are very appreciated by the aerospace, partly automotive and industrial in general, for its great strength, high temperature and corrosion resistant.
Reinaldo Correa   +2 more
doaj   +1 more source

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