Results 31 to 40 of about 445,081 (268)
Iterative methods for solving Ambartsumian’s equations. Part 1
Известия высших учебных заведений. Поволжский регион: Физико-математические науки, 2021 Background. Ambartsumian’s equation and its generalizations are one of the main integral equations of astrophysics, which have found wide application in many areas of physics and technology. An analytical solution to this equation is currently unknown,
I.V. Boykov, A.A. Shaldaeva
doaj +1 more source
Talbot quadratures and rational approximations [PDF]
BIT Numerical Mathematics, 2006 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Trefethen, L. N. +2 more
openaire +2 more sources
Quadrature-based features for kernel approximation
CoRR, 2018 We consider the problem of improving kernel approximation via randomized feature maps. These maps arise as Monte Carlo approximation to integral representations of kernel functions and scale up kernel methods for larger datasets. Based on an efficient numerical integration technique, we propose a unifying approach that reinterprets the previous random ...
Marina Munkhoeva +3 more
openaire +4 more sources
Discrete spherical means of directional derivatives and Veronese maps [PDF]
, 2011 We describe and study geometric properties of discrete circular and spherical means of directional derivatives of functions, as well as discrete approximations of higher order differential operators.
Alexander Belyaev +8 more
core +1 more source
Angewandte Chemie, EarlyView.Manganese‐modulated chemical exchange saturation transfer (CEST) MRI, Manga CEST, leverages intracellular Mn2+ uptake to selectively perturb CEST contrast. Comparing Z‐spectra before and after Mn reveals compartment‐specific contributions. In vivo, neuron‐enriched Mn accumulation induces frequency‐dependent attenuation (3–4 ppm), enabling cell‐weighted
Eleonora Cavallari +3 more
wiley +2 more sources
Design of quadrature rules for Müntz and Müntz-logarithmic polynomials using monomial transformation [PDF]
, 2009 A method for constructing the exact quadratures for Müntz and Müntz-logarithmic polynomials is presented. The algorithm does permit to anticipate the precision (machine precision) of the numerical integration of Müntz-logarithmic polynomials in terms of ...
Lombardi, Guido
core +1 more source
Maximum entropy estimation via Gauss-LP quadratures
, 2017 We present an approximation method to a class of parametric integration problems that naturally appear when solving the dual of the maximum entropy estimation problem.
Thély, Maxime +6 more
core +3 more sources
Quadratures of Pontryagin extremals for optimal control problems [PDF]
, 2006 We obtain a method to compute effective first integrals by combining Noether's principle with the Kozlov-Kolesnikov integrability theorem. A sufficient condition for the integrability by quadratures of optimal control problems with controls taking values
Rocha, E. A. +3 more
core +2 more sources
Strong Coupling in Bulk Nanoplasmonic Nanoplatelet Perovskite Scintillators
Advanced Materials, EarlyView.A bulk scintillating nanocomposite is engineered from CsPbBr3 nanoplatelets and Ag nanocubes to support exciton–plasmon strong coupling under X‐ray excitation. The resulting hybrid polaritonic states appear directly in radioluminescence, opening a route toward polariton‐enabled scintillator design beyond conventional Purcell enhancement.
Michal Makowski +13 more
wiley +1 more source
Hermite–Padé approximation and simultaneous quadrature formulas
Journal of Approximation Theory, 2004 We study Hermite–Padé approximation of the so-called Nikishin systems of functions. In particular, the set of multi-indices for which normality is known to take place is considerably enlarged as well as the sequences of multi-indices for which convergence of the corresponding simultaneous rational approximants takes place.
Ulises Fidalgo Prieto +2 more
openaire +4 more sources