Results 41 to 50 of about 770,616 (284)

Denseness of Numerical Radius Attaining Holomorphic Functions

Journal of Inequalities and Applications, 2009
We study the density of numerical radius attaining holomorphic functions on certain Banach spaces using the Lindenstrauss method. In particular, it is shown that if a complex Banach space X is locally uniformly convex, then the set of all numerical ...
Han Ju Lee
doaj   +2 more sources

Improved Bounds for the Euclidean Numerical Radius of Operator Pairs in Hilbert Spaces

Mathematics
This paper presents new lower and upper bounds for the Euclidean numerical radius of operator pairs in Hilbert spaces, demonstrating improvements over recent results by other authors.
Najla Altwaijry, Silvestru Sever Dragomir, Kais Feki   +2 more
doaj   +1 more source

Influence and Optimization of Geometric Parameters for Small-Radius Curved Tunnel Based on Response Surface Method

Applied Sciences, 2023
Compared with straight tunnels, small-radius curved tunnels are more common and have more complex influencing factors in urban underground traffic. Therefore, the seismic evaluation of small-radius curved tunnels is of great significance for the safe ...
Xiaojiu Feng, Yongtian Xie, Shaofeng Liu, Fujian Yang   +3 more
doaj   +1 more source

Sharpening some classical numerical radius inequalities [PDF]

Operators and Matrices, 2018
New upper and lower bounds for the numerical radii of Hilbert space operators are given. Among our results, we prove that if $A\in \mathcal{B} \left( \mathcal{H}\right) $ is a hyponormal operator, then for all non-negative non-decreasing operator convex $f$ on $ [0,\infty ),$ we have \[f\left( \left( A \right) \right)\le \frac{1}{2}\left\| f\left ...
Omidvar, Mohsen Erfanian, Moradi, Hamid Reza, Shebrawi, Khalid   +2 more
openaire   +3 more sources

Generalized Cauchy–Schwarz Inequalities and A-Numerical Radius Applications

Axioms, 2023
The purpose of this research paper is to introduce new Cauchy–Schwarz inequalities that are valid in semi-Hilbert spaces, which are generalizations of Hilbert spaces.
Najla Altwaijry, Kais Feki, Shigeru Furuichi   +2 more
doaj   +1 more source

Stability of an Exciton bound to an Ionized Donor in Quantum Dots

, 2002
Total energy, binding energy, recombination rate (of the electron hole pair) for an exciton (X) bound in a parabolic two dimensional quantum dot by a donor impurity located on the z axis at a distance d from the dot plane, are calculated by using the ...
A.F. Terzis, Baskoutas, Bolcatto, C. Politis, Essaoudi, Jacak, Lampert, Lannoo, Liu, M. Rieth, McEuen, Ping, Ranjan, Reynolds, Rieth, S. Baskoutas, Skettrup, Stauffer, Stébé, V. Kapaklis, W. Schommers, Wang, Woggon, Xie, Xie, Xie   +25 more
core   +1 more source

Convex numerical radius

Journal of Mathematical Analysis and Applications, 2010
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +2 more sources

New Bounds for the Davis–Wielandt Radius via the Moore–Penrose Inverse of Bounded Linear Operators

Axioms
In this paper, we obtain some new upper bounds involving powers of the Davis–Wielandt radius of bounded linear operators with closed ranges by using the Moore–Penrose inverse.
Xiaomei Dong, Yuzhen Guo, Deyu Wu
doaj   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

On Some Sufficiency-Type Stability and Linear State-Feedback Stabilization Conditions for a Class of Multirate Discrete-Time Systems

Mathematics, 2018
This paper presents and discusses the stability of a discrete multirate sampling system whose sets of sampling rates (or sampling periods) are the integer multiple of those operating on all the preceding substates.
M. De la Sen
doaj   +1 more source