Results 1 to 10 of about 18,530 (165)

Measurement of Rayleigh Wave Beams Using Angle Beam Wedge Transducers as the Transmitter and Receiver with Consideration of Beam Spreading [PDF]

Sensors, 2017
A theoretical model, along with experimental verification, is developed to describe the generation, propagation and reception of a Rayleigh wave using angle beam wedge transducers. The Rayleigh wave generation process using an angle beam wedge transducer
Shuzeng Zhang, Xiongbing Li, Hyunjo Jeong   +2 more
doaj   +2 more sources

Performance Analysis of MIMO-mQAM System with Pointing Errors and Beam Spreading in Underwater Málaga Turbulence Channel

Journal of Marine Science and Engineering, 2023
Both the long-term beam spreading caused by ocean turbulence and the pointing errors induced by the jitter of transmitters and receivers degrade the performance of underwater wireless optical communication (UWOC) links.
Jianying Wang, Hongxi Yin, Xiuyang Ji, Yanjun Liang   +3 more
doaj   +3 more sources

Ultrabroadband, achromatic, and non-diffracting perfect optical vortex generation via radial momentum control in dielectric metasurfaces [PDF]

Nature Communications
Optical vortices, beams that carry a twist, are pivotal in advanced technologies like optical manipulation, optical communications and imaging. However, their utility has been hampered by a fundamental limitation: the size and spread of the beam change ...
Tian Xia, Zhenwei Xie, Qiang Zhang, Wenchun Xiao, Hui Yang, Yueqiang Hu, Huigao Duan, Yangjian Cai, Xiaocong Yuan   +8 more
doaj   +2 more sources

Tunable and compact permanent magnet uniform spreading beamline for electron irradiation accelerators

Physical Review Accelerators and Beams, 2023
The growing interest in the field of electron irradiation accelerators has led to various research opportunities, with a crucial emphasis on enhancing the irradiation homogeneity of accelerators to advance the industry of the irradiation process. In this
Zijian Zhou, Keyan Sheng, Zhenyi Zhang, Mianzhi Xiong, Haozhe Li, Jiang Huang   +5 more
doaj   +1 more source

Propagation of Lorentz-Gaussian elliptical multi-Gaussian correlated Schell-Model beam in anisotropic turbulence

Heliyon, 2023
The beam spreading, spectral degree of coherence and evolution behavior of the intensity profile of partially coherent Lorentz-Gaussian elliptical multi-Gaussian correlation Schell-Model beam propagating in anisotropic atmospheric turbulence are studied.
Xu Wu, Xiaolong Mao, Kenan Wu
doaj   +1 more source

Discrete Element Method Analysis of the Spreading Mechanism and Its Influence on Powder Bed Characteristics in Additive Manufacturing

Micromachines, 2021
Laser powder bed fusion additive manufacturing is among the most used industrial processes, allowing for the production of customizable and geometrically complex parts at relatively low cost.
Valerio Lampitella, Marco Trofa, Antonello Astarita, Gaetano D’Avino   +3 more
doaj   +1 more source

Investigation of elimination of powder spreading in manufacture of thin and wide preheating beads from Co–Cr alloy powders using a P-ebeam

Journal of Materials Research and Technology, 2021
A preheating step consisting of the heating of substrates and powder particles is necessary to prevent spreading phenomenon of powders in an electron beam melting (EBM) process.
Ho-Jin Lee, Dong-Gyu Ahn
doaj   +1 more source

Propagation Characteristics of Rectangular Hermite-Gaussian Array Beams Through Oceanic and Atmospheric Turbulence

IEEE Photonics Journal, 2023
This study investigates the propagation characteristics of rectangular Hermite-Gaussian array beams (RHGABs) through the oceanic and atmospheric turbulence considering ocean waves.
Hao Du, Guixuan Ding, Xing Du, Zhenyang Xiong, Sheng Wang, Qiang Liu, Hui Feng, Simeng Wang   +7 more
doaj   +1 more source

Beam intensity and spectral coherence of Hermite-cosine-Gaussian rectangular multi-Gaussian correlated Schell-model beam in oceanic turbulence

Heliyon, 2023
The beam spreading and evolution behavior of a partially coherent, Hermite-cosine-Gaussian (HcosG) rectangular multi-Gaussian correlated Schell-model beam propagating in oceanic turbulence is studied. Analytical expressions for the cross-spectral density
Xu Wu, Chuang Wang, Yuhui Kong, Kenan Wu
doaj   +1 more source

Effects of Asymmetry Atmospheric Eddies on Spreading and Wander of Bessel–Gaussian Beams in Anisotropic Turbulence

IEEE Photonics Journal, 2018
The effects of asymmetry atmospheric eddies on the beam spreading and wander of Bessel–Gaussian (BG) beams in anisotropic turbulence are studied. Results show that turbulence anisotropy leads to the declines in both beam spreading and wander of BG
Mingjian Cheng, Lixin Guo, Jiangting Li, Xu Yan, Ridong Sun, Yang You   +5 more
doaj   +1 more source