Results 31 to 40 of about 23,183 (245)

Focusing fractional-order cylindrical vector beams

Компьютерная оптика, 2021
By numerically simulating the sharp focusing of fractional-order vector beams (0≤m≤1, with azimuthal polarization at m=1 and linear polarization at m=0), it is shown that the shape of the intensity distribution in the focal spot changes from elliptical ...
S.S. Stafeev, V.D. Zaitsev
doaj   +1 more source

Study on the Energy Loss Characteristics of Shaft Tubular Pump Device under Stall Conditions Based on the Entropy Production Method

Journal of Marine Science and Engineering, 2023
This study aimed to reveal the energy loss characteristics of each part of the shaft tubular pump device (STPD) under stall conditions. Numerical simulations were conducted by using the SST k-ω turbulence model with curvature correction, and the ...
Dongtao Ji, Weigang Lu, Bo Xu, Lei Xu, Tao Jiang   +4 more
doaj   +1 more source

Energy flux of a vortex field focused using a secant gradient lens

Компьютерная оптика, 2020
In this paper we simulated the focusing of left circular polarized beam with a second order phase vortex and a second-order cylindrical vector beam by a gradient index Mikaelian lens.
A.G. Nalimov
doaj   +1 more source

A Backflow Power Suppression Strategy for Dual Active Bridge Converter Based on Improved Lagrange Method

Energies, 2023
Dual-active bridge (DAB) converters are receiving increasing attention from researchers as a critical part of the power transmission of energy routers. However, the DAB converter generates a large backflow power in conventional control mode, and when the
Xinwen Zhang, Canlong Wang
doaj   +1 more source

Accuracy of Quantum Monte Carlo Methods for Point Defects in Solids [PDF]

, 2010
Quantum Monte Carlo approaches such as the diffusion Monte Carlo (DMC) method are among the most accurate many-body methods for extended systems. Their scaling makes them well suited for defect calculations in solids. We review the various approximations
Alfè, Alfè, Alfè, Anderson, Armiento, Badinski, Batista, Becke, Bernholc, Blaha, Casula, Ceperley, Chiesa, Collins, Drummond, Du, Eaglesham, Esler, Esler, Ewald, Fahey, Foulkes, Giannozzi, Gilbert, Golub, Heyd, Heyd, Hood, Jones, Kwee, Leung, Lin, López Ríos, Mitáš, Needs, Needs, Nieminen, Otsuka, Pelaz, Perdew, Perdew, Perdew, Perdew, Perdew, Pike, Pozzo, Richie, Rinke, Shim, Tilley, Trail, Trail, Uberuaga, Umrigar, Umrigar, Umrigar, Vaidyanathan, Williamson, Wu, Zhu   +59 more
core   +1 more source

Toroidal polarization vortices in tightly focused beams with singularity

Компьютерная оптика, 2020
In this paper, we numerically investigated tight focusing of cylindrical vector beams of the sec-ond order using Richards-Wolf formulae. It was shown that intensity rings where the Poynting vector was equal to zero appeared not only in the focal plane ...
S.S. Stafeev, V.V. Kotlyar
doaj   +1 more source

Spin-orbit induced backflow in neutron matter with auxiliary field diffusion Monte Carlo [PDF]

, 2003
The energy per particle of zero-temperature neutron matter is investigated, with particular emphasis on the role of the $\vec L\cdot\vec S$ interaction.
A. Akmal, A. Akmal, A. Sarsa, B.S. Pudliner, I. Vidaña, J. Morales, Jr., K. E. Schmidt, K.E. Schmidt, K.E. Schmidt, L. Brualla, M. Baldo, R.B. Wiringa, R.B. Wiringa, S. A. Vitiello, S. Fantoni, S. Fantoni, S.C. Pieper, V.R. Pandharipande   +17 more
core   +2 more sources

Rational Design Strategy for Triboelectric Nanogenerators Based on Electron Back Flow and Ionic Defects: The Case of Polytetrafluoroethylene

Advanced Electronic Materials, 2023
The lack of theoretical understanding of triboelectrification has hindered the development of energy harvesting technologies like triboelectric nanogenerators.
Giulio Fatti, Alessandra Ciniero, Hyunseok Ko, Han Uk Lee, Yujin Na, Chang Kyu Jeong, Sang‐Geul Lee, Dongyub Kwak, Kwi‐Il Park, Sung Beom Cho, Daniele Dini   +10 more
doaj   +1 more source

Enhanced optical trapping assisted by resonant energy backflow in a perforated dielectric microsphere

, 2022
Optical energy flow inside a dielectric microsphere exposed to an optical wave is usually codirected with its wave vector. At the same time, if the optical field in a microparticle is in resonance with a high-quality spatial eigenmode, referred to as the whispering-gallery mode (WGM), at least two regions of reverse energy flow emerge in the ...
Geints, Yury E., Minin, Igor V., Minin, Oleg V.   +2 more
openaire   +2 more sources

Quantum Monte Carlo study of the ground state of the two-dimensional Fermi fluid [PDF]

, 2009
We have used the variational and diffusion quantum Monte Carlo methods to calculate the energy, pair correlation function, static structure factor, and momentum density of the ground state of the two-dimensional homogeneous electron gas.
Drummond, N. D., Needs, R. J.
core   +2 more sources