Results 21 to 30 of about 2,171,485 (241)

Selector for the Spectrum Award 2018

, 2018
Billingham was invited to be part of the selection panel for the first Spectrum Award in 2018 alongside Mark Wallinger, Charming Baker, Professor Simon Baron-Cohen, Sacha Craddock and Mary Simpson.
Billingham, Richard, Spectrum
core   +3 more sources

Nonlinear Fourier transform assisted high-order soliton characterization

New Journal of Physics, 2022
Nonlinear Fourier transform (NFT), based on the nonlinear Schrödinger equation, is implemented for the description of soliton propagation, and in particular focused on propagation of high-order solitons.
Yutian Wang, Fanglin Chen, Songnian Fu, Jian Kong, Andrey Komarov, Mariusz Klimczak, Ryszard BuczyČski, Xiahui Tang, Ming Tang, Luming Zhao   +9 more
doaj   +1 more source

Celestial Spectrum Velocimetry With Non-Linear Fourier Phase Shift and Its CRLB

IEEE Access, 2022
To solve the problem of the non-linear Fourier phase shift caused by the wavelength shift in the celestial spectrum velocimetry, a celestial spectrum velocimetry method based on non-uniform discrete Fourier transform and compressed sensing is proposed ...
Zijun Zhang, Jin Liu, Xiaolin Ning
doaj   +1 more source

Research on terrain correction method of airborne γ spectrometry

He jishu, 2021
BackgroundAirborne gamma spectrometer is a method to measure ground gamma nuclide activity (specific activity) by installing gamma spectrometer on aircraft. The accuracy of results is affected by flight altitude and terrain fluctuation.
LIU Qiushi, ZHANG Qingxian, YANG Hai, XIONG Shengqing, GE Liangquan, XIAO Hongfei, XIONG Maolin, MI Yaohui, ZHANG Jian, CHEN Rui   +9 more
doaj   +1 more source

Magnetic Schrödinger Operators with Discrete Spectra on Non-Compact Kähler Manifolds

Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2012
We identify a class of magnetic Schrödinger operators on Käler manifolds which exhibit pure point spectrum. To this end we embed the Schröinger problem into a Dirac-type problem via a parallel spinor and use a Bochner-Weitzenböck argument to prove our ...
Anghel Nicolae
doaj   +1 more source

Exclusion statistics for particles with a discrete spectrum

Nuclear Physics B, 2021
We formulate and study the microscopic statistical mechanics of systems of particles with exclusion statistics in a discrete one-body spectrum. The statistical mechanics of these systems can be expressed in terms of effective single-level grand partition
Stéphane Ouvry, Alexios P. Polychronakos   +1 more
doaj   +1 more source

The second four-electron singlet in the Hubbard impurity model

Современная математика: Фундаментальные направления
We consider the energy operator of four-electron systems in the Hubbard impurity model and investigate the structure of the essential spectrum and discrete spectra for the second singlet state of the system.
S. M. Tashpulatov, R. T. Parmanova
doaj   +1 more source

The discrete sine transform and the spectrum of the finite q-ary tree. [PDF]

, 2005
We compute the spectrum of the finite q-ary tree using radon transforms and the discrete sine ...
SCARABOTTI, Fabio
core   +1 more source

On negative eigenvalues of 1D Schrödinger operators with δ′-like potentials

Frontiers in Applied Mathematics and Statistics
In this paper, we investigate negative eigenvalues of exactly solvable quantum models, particularly one-dimensional Hamiltonians with δ′-like potentials used to represent localized dipoles.
Yuriy Golovaty, Rostyslav Hryniv, Rostyslav Hryniv   +2 more
doaj   +1 more source

Spectral Analysis of Non-selfadjoint Second Order Difference Equation with Operator Coefficient

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2020
In this paper, we consider the discrete Sturm-Liouville operator generated by second order difference equation with non-selfadjoint operator coefficient.
Esra Kır Arpat, Gökhan Mutlu
doaj   +1 more source