Results 61 to 70 of about 3,222 (145)

Covariance Estimation for Wide Data

WIREs Computational Statistics, Volume 18, Issue 2, June 2026.
Covariance matrix estimation is fundamental to multivariate analysis, with applications spanning finance, genomics, climate science, and signal processing. This review synthesizes recent advances in high‐dimensional covariance estimation‐thresholding, linear and nonlinear shrinkage, graphical models, and random matrix theory‐under a unifying framework ...
Eran Raviv
wiley   +1 more source

Structure and intermolecular interactions of the rare amide–pyridine synthon: a cocrystal of nicotinamide and 2‐chloro‐3‐hydroxypyridine

Acta Crystallographica Section C, Volume 82, Issue 6, Page 267-276, June 2026.
Considering its low occurrence in the Cambridge Structural Database, is the amide–pyridyl synthon easy to form, and what structural factors affects its interaction energy and its subsequent formation?Nicotinamide (Nico) and derivatives of pyridine are important materials in both the pharmaceutical and agrochemical industries.
Oluwatoyin Akerele, Andreas Lemmerer
wiley   +1 more source

Efficacy of Nd:YAG Lasers for Tattoo Removal: Systematic Review of Clinical Outcomes, Clearance Rates, and Treatment Parameters

Journal of Cosmetic Dermatology, Volume 25, Issue 6, June 2026.
ABSTRACT Background Nd:YAG lasers are widely used for tattoo removal, selectively targeting deep dermal pigment with relative melanin sparing. Both nanosecond Q‐switched and picosecond‐domain systems are employed in clinical practice. Objectives To evaluate the efficacy and safety of Nd:YAG laser systems for tattoo removal, including clearance ...
Jolie Jin En Wong, Sumbel Khan, Madhvi Tandel, Zaid Dajani, Ishith Seth   +4 more
wiley   +1 more source

Bernstein Cheney Sharma operators [PDF]

, 2018
Bu tez dört bölümden oluGmaktadır. Birinci bölümde tezin amacı ve kaynak özetleri hakkında bilgiler verilmiGtir. Gkinci bölümde tezde kullanılacak temel teoremler, tanımlar ve bazı eGitsizlikler verilmiGir.
Türkmenoğlu, Ayşe
core  

Convergence in Variation for Bernstein-Type Operators [PDF]

, 2016
In this paper, we deal with Bernstein-type operators defined by Cardenas-Morales et al. as , where is the nth Bernstein polynomial (Comput Math Appl 62(1):158-163, 2011).
Bascanbaz-Tunca, Gulen, İNCE İLARSLAN, HATİCE GÜL   +1 more
core   +1 more source

Rate of approximation of blending type modified univariate and bivariate λ-Schurer-Kantorovich operators

Kuwait Journal of Science
In this work, we investigate some approximation properties of blending type univariate and bivariate Schurer-Kantorovich operators based on shape parameter λ ∈ [−1, 1]. We evaluate some moment estimates and obtain several direct theorems.
Reşat Aslan
doaj   +1 more source

Multivariate Bernstein–Durrmeyer operators with arbitrary weight functions [PDF]

, 2010
In this paper we introduce a class of Bernstein–Durrmeyer operators with respect to an arbitrary measure ρ on the d-dimensional simplex, and a class of more general polynomial integral operators with a kernel function involving the Bernstein basis ...
Berdysheva, Elena E., Jetter, Kurt
core   +1 more source

A new kind of Durrmeyer-Stancu-type operators

Demonstratio Mathematica
The objective of this study is to examine a class of positive linear operators, defined in terms of the bψ,kλ,μ{b}_{\psi ,k}^{\lambda ,\mu } basis and to analyze their approximation properties. Direct estimates for the (λ,μ)\left(\lambda ,\mu )-Durrmeyer-
Cai Qing-Bo, Güngör Şule Yüksel, Çekim Bayram   +2 more
doaj   +1 more source

Bernstein-Durrmeyer operators [PDF]

, 1995
In this paper, we consider the Durrmeyer-type modifications of the classical Bernstein, Szász and Baskakov operators, and deal with two different kind of problems.
de la Cal, J., Adell, J.A.
core   +1 more source

Derivatives of multidimensional Bernstein operators and smoothness [PDF]

, 2005
We characterize the directional derivatives of multidimensional Bernstein operators by a new measure of smoothness. This task is carried out by means of establishing the relation between the asymptotic behavior of the derivatives and the smoothness of ...
Cao, Feilong
core   +1 more source