Results 11 to 20 of about 248,702 (267)

Application of Variable-Order Fractional Calculus to the Modeling of Calendar Aging in Lithium-Ion Batteries

open access: yesEnergies, 2023
Battery aging is one of the key challenges that electrochemical energy storage faces. Models for both cycling and calendar aging are valuable for quantitatively assessing their contribution to overall capacity loss.
Juan Antonio López-Villanueva   +3 more
doaj   +1 more source

Extension of rate of change concept: From local to nonlocal operators with applications

open access: yesResults in Physics, 2020
The concept of rate of change gave birth to numerous important theories and applications in mathematics, applied mathematics and other related academic disciplines.
Abdon Atangana
doaj   +1 more source

Unary negation [PDF]

open access: yesLogical Methods in Computer Science, 2013
We study fragments of first-order logic and of least fixed point logic that allow only unary negation: negation of formulas with at most one free variable.
Luc Segoufin, Balder ten Cate
doaj   +1 more source

Some Regularity Properties on Bolza problems in the Calculus of Variations

open access: yesComptes Rendus. Mathématique, 2022
The paper summarizes the main core of the last results that we obtained in [8, 4, 17] on the regularity of the value function for a Bolza problem of a one-dimensional, vectorial problem of the calculus of variations. We are concerned with a nonautonomous
Bernis, Julien   +2 more
doaj   +1 more source

Notions of affinity in calculus of variations with differential forms [PDF]

open access: yes, 2016
Ext-int.\ one affine functions are functions affine in the direction of one-divisible exterior forms, with respect to exterior product in one variable and with respect to interior product in the other.
Bandyopadhyay, Saugata, Sil, Swarnendu
core   +1 more source

Meningkatkan Pemahaman Mahasiswa tentang Konsep Limit Fungsi Satu Variabel Real melalui Pembelajaran Kooperatif

open access: yesJurnal Ilmu Pendidikan, 2016
Students' comprehension on the functional limit concept of one real variable is still low, whereas the limit concept is the main basis in learning calculus further.
Usman H.B.
doaj   +1 more source

Foundational aspects of a new matrix holomorphic structure [PDF]

open access: yesArab Journal of Mathematical Sciences
Purpose – In this paper we talk about complex matrix quaternions (biquaternions) and we deal with some abstract methods in mathematical complex matrix analysis. Design/methodology/approach – We introduce and investigate the complex space HC consisting of
Hedi Khedhiri, Taher Mkademi
doaj   +1 more source

Formulation of scale transformation in a stochastic data assimilation framework [PDF]

open access: yesNonlinear Processes in Geophysics, 2017
Understanding the errors caused by spatial-scale transformation in Earth observations and simulations requires a rigorous definition of scale. These errors are also an important component of representativeness errors in data assimilation.
F. Liu, F. Liu, X. Li, X. Li, X. Li
doaj   +1 more source

Investigating spatial skills and math anxiety as mediatorsinasequential mediation model: A pilot study

open access: yesJournal of Research and Advances in Mathematics Education, 2021
Prior research showed a gender effect on spatial ability, math anxiety, andmath achievement. Lacking, however, is a comprehensive studythattested the mediation effects of spatial ability and math anxiety betweengender and math achievement in a sequential
Lu Wang
doaj   +1 more source

A Generalized Method for Proving Polynomial Calculus Degree Lower Bounds [PDF]

open access: yes, 2015
We study the problem of obtaining lower bounds for polynomial calculus (PC) and polynomial calculus resolution (PCR) on proof degree, and hence by [Impagliazzo et al. '99] also on proof size.
Mikša, Mladen, Nordström, Jakob
core   +3 more sources

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