Results 41 to 50 of about 8,297,474 (354)

New insights on the impact of coefficient instability on ratio-correlation population estimates [PDF]

open access: yes, 2016
In this study we examine the regression-based ratio-correlation method and suggest some new tools for assessing the magnitude and impact of coefficient instability on population estimation errors. We use a robust sample of 904 counties from 11 states and
Swanson, David A, Tayman, Jeff
core   +1 more source

Laboratory Estimation of Dispersivity Coefficients

open access: yesProcedia Environmental Sciences, 2015
AbstractThe dispersion phenomena in aquifers through experimental activities have been extensively studied in the past; recently the availability of digital images of the transport process made possible the development of new techniques for the evaluation of the dispersivity coefficients (Sànchez et al., 2008, 2011).
CUPOLA, Fausto   +2 more
openaire   +4 more sources

Faber polynomial coefficient estimates for a class of analytic bi-univalent functions [PDF]

open access: yes, 2018
In the present paper, we were mainly concerned with obtaining estimates for the general Taylor-Maclaurin coefficients for functions in a certain general subclass of analytic bi-univalent functions.
A. Amourah
semanticscholar   +1 more source

Inclusion and properties neighbourhood for certain p-valent functions associated with complex order and q–p-valent Cătaş operator

open access: yesJournal of Taibah University for Science, 2020
Here in our paper, we present two new subclasses of multivalent analytic functions and complex order by using q–p-valent Cătaş operator. Also we obtain coefficient estimates and consequent inclusion relationships involving the $N_{i,\delta }^{\mathbf {p}
M. K. Aouf, S. M. Madian
doaj   +1 more source

Some properties of a new subclass of tilted star-like functions with respect to symmetric conjugate points

open access: yesAIMS Mathematics, 2023
In this paper, we introduced a new subclass $ S_{SC}^*\left({\alpha, \delta, A, B} \right) $ of tilted star-like functions with respect to symmetric conjugate points in an open unit disk and obtained some of its basic properties.
Daud Mohamad   +2 more
doaj   +1 more source

Fekete–Szegö Functional Problem for a Special Family of m-Fold Symmetric Bi-Univalent Functions

open access: yesMathematics, 2022
In the current work, we introduce a special family of the function family of analytic and m-fold symmetric bi-univalent functions and obtain estimates of the Taylor–Maclaurin coefficients |dm+1| and |d2m+1| for functions in the special family.
Sondekola Rudra Swamy   +2 more
doaj   +1 more source

Coefficients of a Comprehensive Subclass of Meromorphic Bi-Univalent Functions Associated with the Faber Polynomial Expansion

open access: yesAxioms, 2021
In this paper, we introduce a new comprehensive subclass ΣB(λ,μ,β) of meromorphic bi-univalent functions in the open unit disk U. We also find the upper bounds for the initial Taylor-Maclaurin coefficients |b0|, |b1| and |b2| for functions in this ...
Hari Mohan Srivastava   +2 more
doaj   +1 more source

Stability estimates for a Robin coefficient in the two-dimensional Stokes system [PDF]

open access: yes, 2012
In this paper, we consider the Stokes equations and we are concerned with the inverse problem of identifying a Robin coefficient on some non accessible part of the boundary from available data on the other part of the boundary.
Boulakia, Muriel   +2 more
core   +4 more sources

On Geometric Properties of a Certain Analytic Function with Negative Coefficients

open access: yesFractal and Fractional, 2022
Various function theorists have successfully defined and investigated different kinds of analytic functions. The applications of such functions have played significant roles in geometry function theory as a field of complex analysis.
Matthew Olanrewaju Oluwayemi   +2 more
doaj   +1 more source

Coefficient Bounds for a Family of s-Fold Symmetric Bi-Univalent Functions

open access: yesAxioms, 2023
We present a new family of s-fold symmetrical bi-univalent functions in the open unit disc in this work. We provide estimates for the first two Taylor–Maclaurin series coefficients for these functions.
Isra Al-shbeil   +5 more
doaj   +1 more source

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