Results 1 to 10 of about 803,698 (154)

Design and Optimization of a Micron-Scale Magnetoelectric Antenna Based on Acoustic Excitation

Micromachines, 2022
The development of antenna miniaturization technology is limited by the principle of electromagnetic radiation. In this paper, the structure size of the antenna is reduced by nearly two orders of magnitude by using Acoustic excitation instead of ...
Na Li, Xiangyang Li, Bonan Xu, Bin Zheng, Pengchao Zhao   +4 more
doaj   +1 more source

Investigations on the Bragg grating recording in all-silica, standard and microstructured optical fibers using 248 nm, 5 ps laser radiation [PDF]

Journal of the European Optical Society-Rapid Publications, 2009
The fabrication of Bragg reflectors in hydrogenated, all-silica, fluorine cladding depressed and microstructured optical fibers using 248 nm, 5 ps laser radiation, is investigated here.
Pissadakis S., Livitziis M., Tsibidis G. D.   +2 more
doaj   +1 more source

Multiple-Beam Steering Using Graphene-Based Coding Metasurfaces

Micromachines, 2023
Recently, the coding metasurface has gained significant attention due to its exceptional potential in controlling electromagnetic (EM) waves with the rapid development of wireless communication systems.
Bin Zheng, Xin Rao, Yuyu Shan, Chuandong Yu, Jingke Zhang, Na Li   +5 more
doaj   +1 more source

Listening to laser light interactions with objects of art: a novel photoacoustic approach for diagnosis and monitoring of laser cleaning interventions

Heritage Science, 2020
Photoacoustic (PA) imaging is a novel, rapidly expanding diagnostic technique, which has been predominately developed in the context of contemporary biomedical research studies.
George J. Tserevelakis, Paraskevi Pouli, Giannis Zacharakis   +2 more
doaj   +1 more source

A Reverse-Design Strategy for the Track Error of the Qi Tai Telescope Based on Pointing Accuracy

Engineering, 2022
The Qi Tai Telescope (QTT), which has a 110 m aperture, is planned to be the largest scale steerable telescope in the world. Ideally, the telescope’s repeated pointing accuracy error should be less than 2.5 arc seconds (arcsec); thus, the telescope ...
Na Li, Baoyan Duan, Xiangyang Li, Bin Zheng, Jiang Wu   +4 more
doaj   +1 more source

The Driving Waveform Design Method of Power-Law Fluid Piezoelectric Printing Based on Iterative Learning Control

Sensors, 2022
In some applications of piezoelectric three-dimensional inkjet printing, the materials used are power-law fluids as they are shear thinning. Their time-varying viscosities affect the droplet formation, which is determined by the volume flow rate at the ...
Ju Peng, Jin Huang, Jianjun Wang, Fanbo Meng, Hongxiao Gong, Bu Ping   +5 more
doaj   +1 more source

Laser-Induced Morphological and Structural Changes of Cesium Lead Bromide Nanocrystals

Nanomaterials, 2022
Metal halide perovskite nanocrystals, an emerging class of materials for advanced photonic and optoelectronic applications, are mainly fabricated with colloidal chemistry routes.
Athanasia Kostopoulou, Konstantinos Brintakis, Maria Sygletou, Kyriaki Savva, Nikolaos Livakas, Michaila Akathi Pantelaiou, Zhiya Dang, Alexandros Lappas, Liberato Manna, Emmanuel Stratakis   +9 more
doaj   +1 more source

Photoacoustic imaging reveals hidden underdrawings in paintings

Scientific Reports, 2017
A novel, non-invasive, imaging methodology, based on the photoacoustic effect, is introduced in the context of artwork diagnostics with emphasis on the uncovering of hidden features such as underdrawings or original sketch lines in paintings ...
George J. Tserevelakis, Ilianna Vrouvaki, Panagiotis Siozos, Krystallia Melessanaki, Kostas Hatzigiannakis, Costas Fotakis, Giannis Zacharakis   +6 more
doaj   +1 more source

A Pavement Piezoelectric Energy Harvester for Small Input Displacements

Micromachines, 2023
In order to collect mechanical energy from human motions on pavement without an obvious disturbance, a piezoelectric harvester for small displacement is proposed. A seesaw mechanism is utilized to transmit the pressure displacement to piezoelectric beams.
Bin Yin, Jiaming Wei, Xin Jiang, Yan Liu
doaj   +1 more source

A Novel Inversion Method of Manufacturing Flaws in the Packaging of Conformal Load-Bearing Antenna Structure

International Journal of Antennas and Propagation, 2015
Composite material is widely used in the conformal load-bearing antenna structure (CLAS), and the manufacturing flaws in the packaging process of the CLAS will lead to the degradation of its wave-transparent property.
P. Li, W. Y. Xu, L. W. Song, Y. Y. Qiu
doaj   +1 more source