Results 41 to 50 of about 2,245,350 (289)

Surface Tension Measurement of Ti‐6Al‐4V by Falling Droplet Method in Oxygen‐Free Atmosphere

Advanced Engineering Materials, EarlyView.
In this article, the temperature‐dependent surface tension of free falling, oscillating Ti‐6Al‐4V droplets is investigated in both argon and monosilane doped, oxygen‐free atmosphere. Droplet temperature and oscillation are captured with one single high‐speed camera, and the surface tension is calculated with Rayleigh's formula.
Johannes May, Finn‐Lennard Janthur, Lena Kreie, Michael Müller, Sarah Seffer, Nick Schwarz, Jörg Hermsdorf, Thomas Hassel, Stefan Kaierle, Ludger Overmeyer   +9 more
wiley   +1 more source

Proof-of-Concept of a Monopulse Antenna Architecture Enabling Radar Sensors in Unmanned Aircraft Collision Avoidance Systems for UAS in U-Space Airspaces

Applied Sciences
In this paper, we propose and prove an innovative radar antenna concept suitable for collision avoidance (CA) systems installed onboard small, unmanned aircraft (UA).
Javier Ruiz Alapont, Miguel Ferrando-Bataller, Juan V. Balbastre   +2 more
doaj   +1 more source

Beamformer for Cylindrical Conformal Array of Non-isotropic Antennas

Advances in Electrical and Computer Engineering, 2011
The principal objective of this investigation is to facilitate minimum variance distortionless response (MVDR) beamforming technique for a cylindrical conformal array geometry.
ZOU, L., LASEBY, J., HE, Z.
doaj   +1 more source

Finite element simulation of microphotonic lasing system

, 2012
We present a method for performing time domain simulations of a microphotonic system containing a four level gain medium based on the finite element method.
Fietz, Chris, Soukoulis, Costas
core   +1 more source

Mechanical Properties of Architected Polymer Lattice Materials: A Comparative Study of Additive Manufacturing and CAD Using FEM and µ‐CT

Advanced Functional Materials, EarlyView.
This study examines how pore shape and manufacturing‐induced deviations affect the mechanical properties of 3D‐printed lattice materials with constant porosity. Combining µ‐CT analysis, FEM, and compression testing, the authors show that structural imperfections reduce stiffness and strength, while bulk material inhomogeneities probably enhance ...
Oliver Walker, Thierry Roland, Damien Favier, Antoine Egele, Michael Heymann, Cosima Stubenrauch   +5 more
wiley   +1 more source

Adaptive beamforming using neural networks for conformal antenna array uses

Discover Applied Sciences
In communication applications, the radiation pattern of conformal antenna arrays is a critical design consideration. By electronically steering the main radiating beam in both azimuth and elevation, a hemispherical coverage can be achieved, enabling a ...
Bilel Hamdi, Radhoine Aloui, Taoufik Aguili   +2 more
doaj   +1 more source

Beamforming of Joint Polarization-Space Matched Filtering for Conformal Array

The Scientific World Journal, 2013
Due to the polarization mismatch of the antenna, the received signal suffers from energy loss. The conventional beamforming algorithms could not be applied to the conformal array because of the varying curvature.
Lutao Liu, Yilin Jiang, Liangtian Wan, Zuoxi Tian   +3 more
doaj   +1 more source

Investigation of Multibeam Forming Algorithm for Cylindrical Conformal Array Antenna

International Journal of Antennas and Propagation, 2022
A multibeam forming algorithm based on cylindrical conformal array antenna is proposed in this paper. A comprehensively optimized algorithm of Taylor weights is used to reduce sidelobes. Multiple beams pointed at different azimuth angles are formed based
Ke Zhao, Lizhe Liu, Lirong Mei
doaj   +1 more source

Three‐dimensional Antimony Sulfide Based Flat Optics

Advanced Functional Materials, EarlyView.
This work presents the development of a grayscale electron beam lithography (g‐EBL) method for fabricating antimony trisulfide (Sb2S3) nanostructures with customizable 3D profiles. The refractive index of g‐EBL patterned Sb2S3 is determined based on the synergy of genetic algorithm and transfer matrix method.
Wei Wang, Uwe Hübner, Anne Gärtner, Tao Chen, Joseph Köbel, Franka Jahn, Daniel Repp, Abhrodeep Dey, Henrik Schneidwind, Andrea Dellith, Jan Dellith, Torsten Wieduwilt, Matthias Zeisberger, Tanveer Ahmed Shaik, Astrid Bingel, Markus A. Schmidt, Jer‐Shing Huang, Ulf Peschel, Volker Deckert   +18 more
wiley   +1 more source

Theoretical Investigation of Phonon Polaritons in SiC Micropillar Resonators [PDF]

, 2016
Of late there has been a surge of interest in localised phonon polariton resonators which allow for sub-diffraction confinement of light in the mid-infrared spectral region by coupling to optical phonons at the surface of polar dielectrics.
De Liberato, Simone, Gubbin, Christopher R., Maier, Stefan A.   +2 more
core   +2 more sources