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Keywords: Derivative
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Hybrid accelerated double step length approach for convex constrained nonlinear monotone equations with applications
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Ghulam Abbass and others
IMA Journal of Applied Mathematics, hxaf009, https://doi.org/10.1093/imamat/hxaf009
Published: 25 April 2025
... equations subject to convex constraints. The method employs an acceleration parameter to approximate the Jacobian matrix. The scheme is derived by combining the double step length method with a Picard–Krasnoselskii hybrid iterative process. Under mild conditions, the approach converges globally. Numerical...
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Numerical methods and regularity properties for viscosity solutions of nonlocal in space and time diffusion equations
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Félix del Teso and Łukasz Płociniczak
IMA Journal of Numerical Analysis, draf011, https://doi.org/10.1093/imanum/draf011
Published: 09 April 2025
... regularity only on the initial condition, we prove convergence of the scheme, space-time Hölder regularity of the solution, depending on the fractional orders of the operators, as well as specific blow up rates of the first time derivative. The schemes’ performance is further numerically verified using both...
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Rapidly imparting chiroptical properties to an achiral azobenzene derivative using helical nanofibers composed of an amidoamine derivative with an unsaturated hydrocarbon
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Tomoki Ito and others
Chemistry Letters, Volume 54, Issue 4, April 2025, upaf069, https://doi.org/10.1093/chemle/upaf069
Published: 27 March 2025
... derivative ( Azo ). Substituting the amphiphile's stearyl group (C18AA) with an oleyl group (OleylAA) significantly accelerates Azo incorporation, achieving complete integration within minutes for OleylAA nanofibers, compared to 24 h for C18AA nanofibers. Graphical Abstract Graphical Abstract azobenzene...
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A coumarin derivative for the efficient and sensitive detection of hypochlorite and imaging in living cells
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Ziyu Huang and others
Chemistry Letters, Volume 54, Issue 3, March 2025, upaf047, https://doi.org/10.1093/chemle/upaf047
Published: 11 March 2025
... Publication Model ( https://dbpia.nl.go.kr/pages/standard-publication-reuse-rights ) Abstract To achieve the precise and specific detection of hypochlorite (ClO−) in living cells, we designed and synthesized the coumarin derivative 7-(diethylamino)-3-(thiophen-2-yl)-2H-chromen-2-one ( CMNT...
Journal Article
Fractionized based rheological features of transient motion of Walter’s B fluid in a rectangular oscillatory duct with cosine and sine oscillations
Muhammad Yasir and others
Journal of Computational Design and Engineering, Volume 12, Issue 4, April 2025, Pages 205–220, https://doi.org/10.1093/jcde/qwaf025
Published: 03 March 2025
.../ ), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract The area of fractional calculus, which incorporates fractional or noninteger order derivatives and integrals, has become one of the more effective fields. As compared...
Journal Article
Least H2 norm updating of quadratic interpolation models for derivative-free trust-region algorithms
Pengcheng Xie and Ya-xiang Yuan
IMA Journal of Numerical Analysis, drae106, https://doi.org/10.1093/imanum/drae106
Published: 01 March 2025
... the terms of the Creative Commons Attribution License ( https://creativecommons.org/licenses/by/4.0/ ), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract One particular class of derivative-free optimization algorithms...
Journal Article
Pricing weather derivatives and managing weather risks under regime switching
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Peng Li and others
IMA Journal of Management Mathematics, dpaf003, https://doi.org/10.1093/imaman/dpaf003
Published: 02 February 2025
... shown that regime switching is an important characteristic of temperature processes. Thus, this work develops an efficient finite difference scheme with one-sided difference to price weather derivatives with the partial differential equations (PDEs) of regime-switching temperature models. For management...
Journal Article
High-order energy stable discrete variational derivative schemes for gradient flows
Jizu Huang
IMA Journal of Numerical Analysis, drae062, https://doi.org/10.1093/imanum/drae062
Published: 18 September 2024
...Jizu Huang (1.7) (1.1) where , with or is the computational domain, is a given total free energy functional and is the variational derivative. The free energy functional usually can be written explicitly as (1.2) where , is an interface energy coefficient...
Journal Article
A Bayesian valuation framework for catastrophe bonds
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Dixon Domfeh and others
Journal of the Royal Statistical Society Series C: Applied Statistics, Volume 73, Issue 5, November 2024, Pages 1389–1410, https://doi.org/10.1093/jrsssc/qlae041
Published: 23 August 2024
...) as an alternative risk transfer (ART) mechanism for raising additional capital. To meet this demand, CAT bonds, an emerging type of ILS, serve as contingent claims on a set of specified trigger mechanisms, with a payoff linked to insurance risk. In other words, they are derivatives with the underlying claims...
Journal Article
q-discretization of the Kostant–Toda equation and its asymptotic analysis
Ryoto Watanabe and others
Transactions of Mathematics and Its Applications, Volume 8, Issue 2, December 2024, tnae003, https://doi.org/10.1093/imatrm/tnae003
Published: 05 July 2024
...-discretization of the Toda equation is the -discrete Toda equation, which is derived by replacing standard derivatives with the so-called -derivatives that involves a parameter such that . In a prior work, we related the -discrete Toda equation to implicit-shift transformations (which...
Journal Article
Efficacy of 2 botanical aphicides, chicoric and 3,5-dicaffeoylquinic acids, on aphids susceptible and resistant to synthetic insecticides
Myriam Siegwart and others
Journal of Economic Entomology, Volume 117, Issue 4, August 2024, Pages 1347–1355, https://doi.org/10.1093/jee/toae069
Published: 28 June 2024
... method to characterize susceptibility to these caffeic derivatives in wild populations of Nasonovia ribisnigri (Mosley) (Hemiptera: Aphididae), Brevicoryne brassicae(Linnaeus) (Hemiptera: Aphididae) and, Aphis craccivora(Koch) (Hemiptera: Aphididae...
Journal Article
Preparation and degradability of novel cross-linked functional hydrogels from enzymatic synthesized α-1,3-glucan and its carboxymethyl derivative
Zhengyu Su and others
Chemistry Letters, Volume 53, Issue 7, July 2024, upae120, https://doi.org/10.1093/chemle/upae120
Published: 12 June 2024
... contact [email protected]. Abstract In this research, we prepared novel hydrogels from enzymatically synthesized α-1,3-glucan and its carboxymethyl derivative by crosslinking with ethylene glycol diglycidyl ether. The resulting hydrogels were highly swellable and pH-sensitive with an enhanced...
Journal Article
Relative controllability for conformable impulsive delay differential equations
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Danfeng Luo and Jizhao Huang
IMA Journal of Mathematical Control and Information, Volume 41, Issue 2, June 2024, Pages 378–400, https://doi.org/10.1093/imamci/dnae013
Published: 21 April 2024
... about controllability, we refer to previous works ( Ahmed, 2021 ; Dineshkumar & Udhayakumar, 2022 ; Jothilakshmi et al., 2022 ; Raja et al., 2022 ; Kumar et al., 2022b , 2023 ; Dineshkumar et al., 2023a , b , c ). where is the conformable derivative...
Journal Article
Cycasin derivative: a potential embryotoxic component of Atractylodes macrocephala rhizome for limb malformation
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Hongliang Xie and others
Toxicology Research, Volume 13, Issue 2, April 2024, tfae057, https://doi.org/10.1093/toxres/tfae057
Published: 13 April 2024
... the incidence of stillbirth and congenital limb malformations. MS spectrometry analysis identified cycasin derivatives in both sub-fractions, suggesting their possible role in the observed limb malformations. However, further experiments are necessary to validate this hypothesis and to elucidate the underlying...
Journal Article
Initial-boundary value problem for a fractional heat equation on an interval
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Y Pérez Peña and others
IMA Journal of Applied Mathematics, Volume 88, Issue 4, August 2023, Pages 632–643, https://doi.org/10.1093/imamat/hxad029
Published: 04 November 2023
... hand, in the last years, interest in fractional calculus has increased substantially. The fractional derivative operators have the property of non-locality, which allows the dynamics of many complex processes in engineering and applied sciences to be modelled (see Ostrovsky (1976) ; Chen & Lee...
Journal Article
EDITOR'S CHOICE
A periodic table of monosaccharides
Richard D Cummings
in
Glycobiology
Glycobiology, Volume 34, Issue 1, January 2024, cwad088, https://doi.org/10.1093/glycob/cwad088
Published: 03 November 2023
... ; Seeberger 2022 ). The building blocks are termed monosaccharides but there are also monosaccharide derivatives that occur within glycomolecules as discrete, basic units with specific linkages. The term monosaccharide is derived from the Greek monos (single) and sacchar (sugar). Unlike...
Journal Article
Inherent irreversibility in unsteady magnetohydrodynamic nanofluid flow past a slippery permeable vertical plate with fractional-order derivative
Zafar H Khan and others
Journal of Computational Design and Engineering, Volume 10, Issue 5, October 2023, Pages 2049–2064, https://doi.org/10.1093/jcde/qwad090
Published: 10 October 2023
... to the unsteady MHD nanofluid flow with entropy generation rate and fractional-order derivative has been further investigated in Afridi et al. ( 2018 ), Makinde and Eegunjobi ( 2021a ), and Tahir and Shahzad ( 2023 ). Raza et al. ( 2023 ) described a new fractional approach for carboxymethyl...
Journal Article
Observed decreasing trend in pan evaporation in a tropical rainforest region during 1959–2021
Yan Jin and others
Journal of Plant Ecology, Volume 17, Issue 1, February 2024, rtad033, https://doi.org/10.1093/jpe/rtad033
Published: 30 September 2023
... to drive Penman‒Monteith and PenPan models for simulating Epan. The partial derivative attribution method was used to analyze the dominant factors affecting Epan. The results showed that Epan exhibits obvious periodic changes, the 19a is the first...
Journal Article
A matrix algebra approach to approximate Hessians
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Warren Hare and others
IMA Journal of Numerical Analysis, Volume 44, Issue 4, July 2024, Pages 2220–2250, https://doi.org/10.1093/imanum/drad056
Published: 28 July 2023
... computational power than interpolation-based methods and is easy to implement in matrix-based programming languages such as MATLAB. As only function evaluations are required, the method is suitable for use in derivative-free algorithms. For reasonably structured sample sets, the method is proven to create...
Journal Article
Adapting the centred simplex gradient to compensate for misaligned sample points
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Yiwen Chen and Warren Hare
IMA Journal of Numerical Analysis, Volume 44, Issue 3, May 2024, Pages 1821–1861, https://doi.org/10.1093/imanum/drad050
Published: 18 July 2023
...Yiwen Chen; Warren Hare Corresponding author: [email protected] 8 8 2022 20 2 2023 12 6 2023 Abstract The centred simplex gradient (CSG) is a popular gradient approximation technique in derivative-free optimization. Its computation requires a perfectly symmetric set of sample points...
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