Results 81 to 90 of about 1,120,334 (339)

Scintillation of Computational Ghost Imaging with a Finite Bucket Detector through Atmospheric Turbulence

Photonics, 2023
Based on the extended Huygens–Fresnel principle and infinitely long phase screen, the scintillation index and the aperture averaging effect of partially coherent beams in computational ghost imaging (CGI) with a finite bucket detector through atmospheric
Hanling Deng, Pengfei Wu, Zhiwei Tao, Xinmiao Li, Yanling Li, Ruizhong Rao, Yichong Ren   +6 more
doaj   +1 more source

Filamentational Instability of Partially Coherent Femtosecond Optical Pulses in Air

, 2006
The filamentational instability of spatially broadband femtosecond optical pulses in air is investigated by means of a kinetic wave equation for spatially incoherent photons.
Bergé, Braun, Couairon, Couairon, Hall, Ivleva, Kato, Koenig, Korobkin, Lange, M. Marklund, Mlejnek, Mlejnek, Moh, Moyal, Nibbering, P. K. Shukla, Skarka, Skupin, Vinçotte, Wigner, Xi   +21 more
core   +2 more sources

Application of AdamSPGD algorithm to sensor-less adaptive optics in coherent free-space optical communication system.

Optics Express, 2022
Sensor-less adaptive optics based on stochastic parallel gradient descent (SPGD) is effective for the compensation of atmospheric disturbances in coherent free-space optical communication systems.
Heng Zhang, Li Xu, Yong-fei Guo, Jingtai Cao, Wei Liu, Leqiang Yang   +5 more
semanticscholar   +1 more source

PBF‐LB/M of Ti‐6Al‐4V: High‐Pressure Solution Treatment and Aging for Applications in a Sustainable Aerospace

Advanced Engineering Materials, EarlyView.
Additive manufacturing (AM) allows great geometric freedom for lightweight components. As parts are progressively optimized exploiting potentials in AM leading in smaller material cross sections, high pressure solution treating and aging (STA) treatments show an enormous potential for strongly improving material properties.
Mika León Altmann, Andre Danzig, Freerk Syassen, Rainer Fechte‐Heinen, Anastasiya Toenjes   +4 more
wiley   +1 more source

Study of Persistent Foggy-Hazy Composite Pollution in Winter over Huainan Through Ground-Based and Satellite Measurements

Atmosphere, 2019
Through the observation of ground-based LIDAR and satellite sensors, the weather conditions of continuous foggy-hazy alternations in the Huainan region from 26 December 2016 to 5 January 2017 were analyzed and observed.
Songlin Fu, Chenbo Xie, Peng Zhuang, Xiaomin Tian, Zhanye Zhang, Bangxin Wang, Dong Liu   +6 more
doaj   +1 more source

Application of a Fusion Model Based on Machine Learning in Visibility Prediction

Remote Sensing, 2023
To improve the accuracy of atmospheric visibility (V) prediction based on machine learning in different pollution scenarios, a new atmospheric visibility prediction method based on the stacking fusion model (VSFM) is established in this paper.
Maochan Zhen, Mingjian Yi, Tao Luo, Feifei Wang, Kaixuan Yang, Xuebin Ma, Shengcheng Cui, Xuebin Li   +7 more
doaj   +1 more source

Interaction between Molten Al‐Killed Mn–B Steel and Carbon‐Bonded MgO Refractories Based on Recyclates

Advanced Engineering Materials, EarlyView.
High‐temperature interactions between low‐sulfur Al‐killed Mn–B steel and MgO–C refractories (0 and 50 wt% recyclates) are studied via finger immersion tests (1600 °C). Surface‐active elements influence infiltration. MgO/CaS layer forms, along with spinel and calcium silicate.
Matheus Roberto Bellé, Lukas Neubert, Anton Yehorov, Till M. J. Stadtmüller, Christos G. Aneziris, Olena Volkova   +5 more
wiley   +1 more source

Monitoring AerosolPollutant Layer by Lidar Combined with some other Instruments [PDF]

Journal of Systemics, Cybernetics and Informatics, 2006
Lidar is a powerful tool for monitoring vertical profile of aerosol pollutant layer (APL) and its variation. The extinction-to-backscatter ratio, S1, is a crucial parameter for quantitative interpretation of lidar data.
Huanling Hu, Qingshan Xu, Chen Li, Xuebin Li   +3 more
doaj  

Automatic sensitivity-adjustment for a curvature sensor

, 2010
There are different techniques to sense the wavefront phase-distortions due to atmospheric turbulence. Curvature sensors are practical in their sensitivity being adjustable to the prevailing atmospheric conditions.
Arsenault, Chun, Diaz-Douton, Glanc, Graves, Hofer, Kornilov, Liang, Moreno-Barriuso, Moreno-Barriuso, Platt, Porter, Rigaut, Roddier, Roddier, Roddier, Sarazin, Sarazin, Torti, Watanabe   +19 more
core   +1 more source

Stratospheric measurements of continuous absorption near 2400 cm^-1 [PDF]

, 1981
Solar occultation spectra obtained with a balloon-borne interferometer have been used to study continuous absorption by N2 and CO2 near 2400 cm^-1 in the lower stratosphere.
Farmer, Crofton B., Park, Jae H., Rinsland, Curtis P., Russell, James M., III, Smith, Mary Ann H.   +4 more
core   +1 more source