Results 61 to 70 of about 36,403 (314)

Singular and non-singular eigenvectors for the Gaudin model [PDF]

J.Math.Phys. 42 (2001) 3497, 2002
We present a method to construct a basis of singular and non-singular common eigenvectors for Gaudin Hamiltonians in a tensor product module of the Lie algebra SL(2). The subset of singular vectors is completely described by analogy with covariant differential operators. The relation between singular eigenvectors and the Bethe Ansatz is discussed.
arxiv   +1 more source

Topology‐Optimized Bound States in the Continuum with High‐Q Acoustic Field Enhancement

Advanced Science, EarlyView.
This study presents a topology optimization method for acoustic metamaterials, achieving high‐Q resonances by redesigning a single unit cell within a periodic array. The design enables precise pressure confinement and energy trapping, validated through experiments.
Weibai Li, Kazem Ghabraie, Xiaodong Huang   +2 more
wiley   +1 more source

Similarities of discrete and continuous Sturm-Liouville problems

Electronic Journal of Differential Equations, 2007
In this paper we present a study on the analogous properties of discrete and continuous Sturm-Liouville problems arising in matrix analysis and differential equations, respectively.
Kazem Ghanbari
doaj  

Tracing Student Activity Patterns in E-Learning Environments: Insights into Academic Performance

Future Internet
In distance learning educational environments like Moodle, students interact with their tutors, their peers, and the provided educational material through various means.
Evgenia Paxinou, Georgios Feretzakis, Rozita Tsoni, Dimitrios Karapiperis, Dimitrios Kalles, Vassilios S. Verykios   +5 more
doaj   +1 more source

Static quark-antiquark potential and Dirac eigenvector correlators [PDF]

JHEP 0805:030,2008, 2008
We represent the Polyakov loop correlator as a spectral sum of correlators of eigenvectors of the lattice Dirac operator. This spectral representation is studied numerically using quenched SU(3) configurations below and above the deconfinement temperature.
arxiv   +1 more source

Origins, Dispersal, and Impact: Bidirectional Introgression Between Chinese and European Pig Populations

Advanced Science, EarlyView.
This study investigates bidirectional introgression between Chinese and European pig populations, revealing 3558 introgressed genomic segments and 30 structural variations. Analysis of the BMP2 region suggests its role in body size enhancement. By integrating ancient and modern genomes, the study highlights the impact of introgression on genetic ...
Yibin Qiu, Langqing Liu, Min Huang, Donglin Ruan, Rongrong Ding, Zebin Zhang, Enqin Zheng, Shiyuan Wang, Shaoxiong Deng, Xianglun Meng, Xinyan Cheng, Jiaxin Shi, Yingshan Yang, Fuchen Zhou, Sixiu Huang, Huaqiang Yang, Zicong Li, Gengyuan Cai, Zhenfang Wu, Jie Yang   +19 more
wiley   +1 more source

Measuring brain beats: Cardiac‐aligned fast functional magnetic resonance imaging signals

Human Brain Mapping, Volume 44, Issue 1, Page 280-294, January 2023., 2023
Blood and cerebrospinal fluid (CSF) pulse and flow throughout the brain, driven by the cardiac cycle. We use rapid functional magnetic resonance imaging (fMRI) measurements to assess blood and CSF flow dynamics in a conventional 3 T magnetic resonance imaging scanner.
Dora Hermes, Hua Wu, Adam B. Kerr, Brian A. Wandell   +3 more
wiley   +1 more source

Mine exogenous fire monitoring method using the fusion of infrared visual features

矿业科学学报
In order to solve the problems of high false positive and false negative rates of external fire monitoring in complex mine environments, a monitoring algorithm using infrared visual feature fusion was proposed.
LI Xiaoyu, FAN Weiqiang, LIU Yi, HUO Yuehua   +3 more
doaj   +1 more source

A Note on Surgical Eigenstructure Assignment via State Feedback [PDF]

arXiv, 2020
Assignability of all eigenvalues and a subset of key eigenvectors/generalized eigenvectors of a linear time-invariant system via state feedback is considered. We clarify that, if the key eigenvectors/generalized eigenvectors and their associated eigenvalues satisfy the classical conditions for full eigenstructure assignment, the remaining eigenvalues ...
arxiv  

Tunable Polariton Rabi Oscillation in Phase‐Changing Perovskite Microcavities

Advanced Science, EarlyView.
This work demonstrated the tunable Rabi oscillation of exciton‐polaritons in MAPbBr3 perovskites due to the emergence of ferroelectricity during the crystallographic phase transition. Both the Rabi oscillation and exciton oscillator strength exhibit an unusual temperature dependence that is related to the emergence of ferroelectricity in the tetragonal
Hyeon‐Seo Choi, Minjee Ko, Taejin Lee, Jin‐Woo Jung, Young‐Jun Lee, Hyeonjong Jeong, Youngjae Kim, Dongha Kim, Jinhee Heo, Shinbuhm Lee, JaeDong Lee, Chang‐Hee Cho   +11 more
wiley   +1 more source