Results 41 to 50 of about 21,612 (157)

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

open access: yesКомпьютерная 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

500th Anniversary of Gerard Mercator's Birth

open access: yesKartografija i Geoinformacije, 2012
Mercator was a geographer, mathematician, astronomer, globe producer, constructor of scientific instruments, copper engraver, cartographer, surveryor and publisher. The conformal cylindrical projection was named the Mercator projection after him.
Ivka Kljajić
doaj  

A Mutiparameter Joint Estimation Algorithm for Dual-Polarized Cylindrical Conformal Array in the Presence of Mutual Coupling

open access: yesInternational Journal of Antennas and Propagation, 2022
In this article, we proposed a multiparameter joint estimation algorithm based on the dual-polarized cylindrical conformal array (DCCA) in the presence of mutual coupling.
Chao Liu, Feiyang Zhou
doaj   +1 more source

The generation method of orthophoto expansion map of arched dome mural based on three-dimensional fine color model

open access: yesHeritage Science
Murals carry cultural significance and historical information, and are an important channel for understanding ancient social norms, artistic styles, and religious beliefs.
Chunmei Hu   +5 more
doaj   +1 more source

On Helical Projection and Its Application in Screw Modeling

open access: yesAdvances in Mechanical Engineering, 2014
As helical surfaces, in their many and varied forms, are finding more and more applications in engineering, new approaches to their efficient design and manufacture are desired.
Riliang Liu, Haiguang Zhu
doaj   +1 more source

Dome Over The Gdynia Seaport Building

open access: yesArchives of Civil Engineering, 2014
The paper presents the description of structure and the selected problems of the technical condition, as well as the strength analysis of the thin-walled reinforced concrete shell which has been making a covering of the main hall of the Gdynia Seaport ...
Godycki-Ćwirko T.   +2 more
doaj   +1 more source

Subjective Assessment of 360° Image Projection Formats

open access: yesIEEE Access, 2020
Recently, the use of virtual reality has been spreading rapidly in many industrial fields, such as games and entertainment, and 360° contents are widely used in various applications of the virtual reality (VR) market.
Tran Thi Hai Uyen   +3 more
doaj   +1 more source

Piezoelectric line detector array for photoacoustic tomography

open access: yesPhotoacoustics, 2017
Photoacoustic tomography relies on a dense coverage of the surface surrounding the imaged object with ultrasound sensors in order to enable an accurate reconstruction.
Guenther Paltauf   +3 more
doaj   +1 more source

Numerical Method for Electromagnetic Wave Propagation Problem in a Cylindrical Inhomogeneous Metal Dielectric Waveguiding Structures

open access: yesMathematical Modelling and Analysis, 2017
The propagation of monochromatic electromagnetic waves in metal circular cylindrical dielectric waveguides filled with inhomogeneous medium is considered.
Eugene Smolkin
doaj   +1 more source

A Three-dimensional Imaging Algorithm Fusion with w-K and BP Algorithm for Millimeter-wave Cylindrical Scanning

open access: yesLeida xuebao, 2018
A new Three-Dimensional (3D) scene reconstruction method is proposed to meet the practical application requirement of the active cylindrical scanning millimeter-wave 3D imaging security apparatus.
Xie Pengfei, Zhang Lei, Wu Zhenhua
doaj   +1 more source

Home - About - Disclaimer - Privacy