scholarly journals Large-scale holographic particle 3D imagingwith the beam propagation model

2021 ◽  
Author(s):  
Hao Wang ◽  
Waleed Tahir ◽  
Jiabei Zhu ◽  
Lei Tian
Keyword(s):  
Large Scale ◽  
Beam Propagation ◽  
Propagation Model

Beam Propagation Method Based on the Iterated Crank–Nicolson Scheme for Solving Large-Scale Wave Propagation Problems

2015 ◽  
Vol 51 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Dimitra A. Ketzaki ◽  
Ioannis T. Rekanos ◽  
Theodoros I. Kosmanis ◽  
Traianos V. Yioultsis
Keyword(s):  
Wave Propagation ◽  
Large Scale ◽  
Beam Propagation Method ◽  
Beam Propagation ◽  
Nicolson Scheme ◽  
Crank Nicolson

scholarly journals The Large Scale Machine Learning in an Artificial Society: Prediction of the Ebola Outbreak in Beijing

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Peng Zhang ◽  
Bin Chen ◽  
Liang Ma ◽  
Zhen Li ◽  
Zhichao Song ◽  
...  
Keyword(s):  
Machine Learning ◽  
Large Scale ◽  
Ebola Virus ◽  
Virus Disease ◽  
Propagation Model ◽  
Propagation Mechanism ◽  
Chinese Government ◽  
Emergency Plans ◽  
Artificial Society ◽  
The City

Ebola virus disease (EVD) distinguishes its feature as high infectivity and mortality. Thus, it is urgent for governments to draw up emergency plans against Ebola. However, it is hard to predict the possible epidemic situations in practice. Luckily, in recent years, computational experiments based on artificial society appeared, providing a new approach to study the propagation of EVD and analyze the corresponding interventions. Therefore, the rationality of artificial society is the key to the accuracy and reliability of experiment results. Individuals’ behaviors along with travel mode directly affect the propagation among individuals. Firstly, artificial Beijing is reconstructed based on geodemographics and machine learning is involved to optimize individuals’ behaviors. Meanwhile, Ebola course model and propagation model are built, according to the parameters in West Africa. Subsequently, propagation mechanism of EVD is analyzed, epidemic scenario is predicted, and corresponding interventions are presented. Finally, by simulating the emergency responses of Chinese government, the conclusion is finally drawn that Ebola is impossible to outbreak in large scale in the city of Beijing.

Accomplishment of Numerical Simulation for a SSD Beam Propagation in a Large Scale Plasma

2017 ◽  
Vol 44 (12) ◽  
pp. 1201004
Author(s):  
李斌 Li Bin ◽  
刘占军 Liu Zhanjun ◽  
郝亮 Hao Liang ◽  
胡晓燕 Hu Xiaoyan ◽  
郑春阳 Zheng Chunyang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Beam Propagation

scholarly journals Propagation Model in Indoor and Outdoor for the LTE Communications

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Sun-Kuk Noh ◽  
DongYou Choi
Keyword(s):  
Mobile Communication ◽  
Mobile Communications ◽  
Communication Systems ◽  
Large Scale ◽  
Propagation Model ◽  
Time Rate ◽  
Propagation Models ◽  
5G Mobile Communication ◽  
Time Changes ◽  
Indoor And Outdoor

Rapidly rising demand for radio communication and the explosion in the number of mobile communications service subscribers have led to the need for optimization in the development of fifth-generation (5G) mobile communication systems. Previous studies on the development of propagation models considering a propagation environment in the existing microwave band have been mainly focused on analyzing the propagation characteristics with regard to large-scale factors such as path losses, delay propagation, and angle diffusions. In this paper, we investigated the concept of spatial and time changes ratios in the measurement of wave propagations and measured RSRP of Long Term Evolution (LTE) signals at three locations considering the time rate of 1% and 50%. We confirmed the concept of spatial and time changes rate based on the results of analyzing the signal data measured and proposed the propagation models 1 and 2 in microcell downtown. The forecast results using proposed models 1 and 2 were better than the COST231 model in both indoor and outdoor measured places. It was predicted between a time rate of 1% and 50% indoor within 400m and outdoor within 200m. In the future, we will study the propagation model of 5G mobile communication as well as the current 4G communication using artificial intelligence technology.

Active Flow Control of Turbulent Refractive Interfaces in Separated Shear Layers for Laser Beam Propagation

2007 ◽  
Author(s):  
Fazlul R. Zubair ◽  
Haris J. Catrakis
Keyword(s):  
Laser Beam ◽  
Large Scale ◽  
Flow Behavior ◽  
Direct Reduction ◽  
Active Flow Control ◽  
Beam Propagation ◽  
Shear Layers ◽  
Plasma Actuators ◽  
Pulsed Plasma ◽  
Laser Beam Propagation

The behavior of turbulent refractive interfaces, and means for the optimization of these interfaces, is essential in various basic and applied studies concerning the propagation of optical wavefronts such as laser beam wavefronts through turbulence or optical imaging through turbulence. In this study, the structure of turbulent refractive interfaces and aero-optical interactions along laser beam propagation paths, in unforced and forced separated compressible shear layers, are examined through use of direct imaging and pulsed plasma actuators. Dielectric-barrier discharge (DBD) pulsed plasma actuators are used to excite the flow prior to separation. Our interest is in searching for the frequencies and amplitudes of the forcing that produce direct suppression of the large scale turbulent interfaces and, thereby, direct reduction of the laser wavefront aberrations. Whole-field shadowgraph imaging of pure-air separated shear layers is conducted for control off vs. control on cases at various forcing frequencies, in order to explore the effects of plasma forcing on the large-scale flow behavior. Direct profiling of forced vs. unforced turbulence-aberrated laser wavefronts propagated transversely through shear layers is conducted using high-resolution Shack-Hartmann microlens arrays. Evidence is presented showing significant reduction of the turbulence-induced laser aberrations, for forced vs. unforced shear layers, indicating the presence of a mechanism of suppression, i.e. disorganization, of large-scale organized structures by high-frequency pulsed plasma forcing.

Finite difference beam propagation model for tapered waveguide with intracavity lens

2001 ◽  
Author(s):  
Atef M. Rashed ◽  
Kevin A. Williams ◽  
Richard V. Penty ◽  
Ian H. White
Keyword(s):  
Finite Difference ◽  
Beam Propagation ◽  
Propagation Model ◽  
Tapered Waveguide
Sign in / Sign up

Export Citation Format

Share Document