Results 51 to 60 of about 4,538,824 (321)

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

Refinement of the Cauchy-Schwartz inequality with refinements and generalizations of the numerical radius type inequalities for operators

Annals of Mathematics and Computer Science
Motivated by the results previously reported, the current work aims at developing new numerical radius upper bounds of Hilbert space opera- tors by offering new improvements to the well-known Cauchy-Schwarz inequal- ity.
Vuk Stojiljković, S. Dragomir
semanticscholar   +1 more source

Further Inequalities for the Weighted Numerical Radius of Operators

Mathematics, 2022
This paper deals with the so-called A-numerical radius associated with a positive (semi-definite) bounded linear operator A acting on a complex Hilbert space H. Several new inequalities involving this concept are established.
N. Altwaijry, Kais Feki, N. Minculete
semanticscholar   +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

Inequalities for operator space numerical radius of $2\times 2$ block matrices

, 2015
In this paper, we study the relationship between operator space norm and operator space numerical radius on the matrix space $\mathcal{M}_n(X)$, when $X$ is a numerical radius operator space. Moreover, we establish several inequalities for operator space
Moslehian, Mohammad Sal, Sattari, Mostafa   +1 more
core   +1 more source

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

Convexity and inequalities of some generalized numerical radius functions

Filomat, 2022
In this paper, we prove that each of the following functions is convex on R: f(t) = wN(AtXA1?t ? A1?tXAt), g(t) = wN(AtXA1?t), and h(t) = wN(AtXAt) where A > 0, X ? Mn and N(.) is a unitarily invariant norm onMn. Consequently, we answer positively the
H. Abbas, Sadeem Harb, H. Issa
semanticscholar   +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

Disordered but rhythmic—the role of intrinsic protein disorder in eukaryotic circadian timing

FEBS Letters, EarlyView.
Unstructured domains known as intrinsically disordered regions (IDRs) are present in nearly every part of the eukaryotic core circadian oscillator. IDRs enable many diverse inter‐ and intramolecular interactions that support clock function. IDR conformations are highly tunable by post‐translational modifications and environmental conditions, which ...
Emery T. Usher, Jacqueline F. Pelham
wiley   +1 more source

Numerical range for random matrices

, 2014
We analyze the numerical range of high-dimensional random matrices, obtaining limit results and corresponding quantitative estimates in the non-limit case. For a large class of random matrices their numerical range is shown to converge to a disc.
Collins, Benoît, Gawron, Piotr, Litvak, Alexander E., Życzkowski, Karol   +3 more
core   +1 more source