Results 41 to 50 of about 236 (142)

Quaternary stabilization of a GH2 β‐galactosidase from the psychrophile A. ikkensis, a flexible and unstable dimeric enzyme

Protein Science, Volume 34, Issue 5, May 2025.
Abstract Studies of cold‐active enzymes may elucidate the basis for low‐temperature activity and contribute to their wider application in energy‐efficient processes. Here we investigate the cold‐active GH2 β‐galactosidase from the psychrophilic bacterium Alkalilactibacillus ikkensis (AiLac).
Jan S. Nowak, Nikoline Kruuse, Helena Ø. Rasmussen, Pengfei Tian, Julie Astono, Søren Schultz‐Nielsen, Mariane S. Thøgersen, Peter Stougaard, Jan Skov Pedersen, Daniel E. Otzen   +9 more
wiley   +1 more source

Topological coordination numbers and coordination reciprocity from electron‐density distributions

Acta Crystallographica Section A, Volume 81, Issue 3, Page 221-244, May 2025.
An approach is presented to calculate topological coordination numbers (tCNs) obeying the principle of coordination reciprocity from solid angles subtended by the interatomic surfaces of electron density (QTAIM) atomic domains. The tCN approach characterizes a compound's coordination situation as a set of sub‐coordination scenarios with associated ...
Frank R. Wagner, Riccardo Freccero, Yuri Grin   +2 more
wiley   +1 more source

Optimized Hybrid Probabilistic and Geometric Constellation Shaping for Coherent Optical Communication Systems Using End‐to‐End Learning

Advanced Photonics Research, Volume 6, Issue 4, April 2025.
In this article, hybrid probabilistic and geometric constellation shaping to enhance spectral efficiency in coherent optical communication systems, particularly under a Wiener phase noise channel, is investigated. By integrating a two‐stage phase search algorithm with digital signal processing and gradient descent, the method outperforms geometrically ...
Zhiyang Liu, Lu Zhang, Xiaoyu Liu, Shilin Xiao, Weiying Yang, Weisheng Hu   +5 more
wiley   +1 more source

Completeness and Regularization Techniques for Wiener-Hopf problems with Discontinuous Layers

2023 17th European Conference on Antennas and Propagation (EuCAP), 2023
Scattering and radiation by buried multiple objects in multilayered media is of great interest in a vast variety of electromagnetic applications. In this work, we present a general methodology to analyze the complex scattering problems with the capability of semi-analytical method in spectral domain, which allows physical interpretation of the problem ...
Daniele, Vito, Lombardi, Guido
openaire   +1 more source

Asymptotics of block Toeplitz determinants with piecewise continuous symbols

Communications on Pure and Applied Mathematics, Volume 78, Issue 1, Page 120-160, January 2025.
Abstract We determine the asymptotics of the block Toeplitz determinants detTn(ϕ)$\det T_n(\phi)$ as n→∞$n\rightarrow \infty$ for N×N$N\times N$ matrix‐valued piecewise continuous functions ϕ$\phi$ with a finitely many jumps under mild additional conditions.
Estelle Basor, Torsten Ehrhardt, Jani A. Virtanen   +2 more
wiley   +1 more source

Wiener Filter Using the Conjugate Gradient Method and a Third-Order Tensor Decomposition

Applied Sciences
In linear system identification problems, the Wiener filter represents a popular tool and stands as an important benchmark. Nevertheless, it faces significant challenges when identifying long-length impulse responses.
Jacob Benesty, Constantin Paleologu, Cristian-Lucian Stanciu, Ruxandra-Liana Costea, Laura-Maria Dogariu, Silviu Ciochină   +5 more
doaj   +1 more source

THEORETICAL ASPECTS AND METHODS OF PARAMETERS IDENTIFICATION OF ELECTRIC TRACTION SYSTEM DEVICES. METHOD OF WEIGHT FUNCTION

Nauka ta progres transportu, 2014
Purpose. Development and substantiation of a new method of structural identification of electrical devices of electric traction systems for both DC and AC current. Methodology.
T. N. Mishchenko
doaj   +1 more source

Wiener–Hopf technique for a fractional mixed boundary value problem in cylindrical layer

Arabian Journal of Mathematics, 2023
AbstractIn this paper, we study the heat transfer modeling during freezing of a biological tissue and present an analytical approach for solving the heat transfer problem in cryosurgery. We consider a time-fractional bio-heat equation in the cylindrical coordinate and employ the Wiener–Hopf technique to find the temperature of tissue in two different ...
Ansari, Alireza, Masomi, Mohammad Rasool
openaire   +2 more sources

Clutter rank estimation for the multistage Wiener filter

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
The authors propose an algorithm that determines the rank of the sea clutter and relates it to the number of stages in the multistage Wiener filter. The algorithm presented is formulated as a model order estimation problem that utilises the minimum description length (MDL).
Rachel Gray, Elias Aboutanios, Luke Rosenberg, Josef Zuk   +3 more
wiley   +1 more source

Distributed Control for Mittag–Leffler Synchronization of Variable‐Order Fractional Gierer–Meinhardt Reaction‐Diffusion Systems

Journal of Mathematics, Volume 2025, Issue 1, 2025.
This paper investigates Mittag–Leffler synchronization (MLSY) for variable‐order fractional Gierer–Meinhardt reaction‐diffusion systems (VFO‐GM‐RDs). We introduce, for the first time, a distributed control scheme specifically designed to achieve MLSY in these complex systems. A key contribution is the derivation of an explicit analytical expression for
Osama Ogilat, Iqbal H. Jebril, Iqbal M. Batiha, Nidal Anakira, Tala Sasa, Yongqiang Fu   +5 more
wiley   +1 more source