Results 31 to 40 of about 12,639,273 (197)

Low Limit for Effective Signal Strength in the Stratus OCT in Imperative Low Signal Strength Cases [PDF]

Korean Journal of Ophthalmology, 2012
To determine the lowest limit of signal strength that is still effective for accurate analysis of optic coherence tomography (OCT) values, we investigated the reproducibility of OCT scans by signal strength (SS).A total of 668 subjects were scanned for measurements of retinal nerve fiber layer (RNFL) thickness using the Stratus OCT twice on the same ...
Ha, Man Mook, Kim, Joon Mo, Kim, Hyun Joong, Park, Ki Ho, Kim, Martha, Choi, Chul Young   +5 more
openaire   +2 more sources

Characteristics of Aerosol and Cloud over the Central Plain of North China in Summer

应用气象学报, 2021
The vertical distribution of aerosols and clouds is a key issue in the indirect climate effects of aerosols. Based on the aerosol and cloud droplet number concentration data observed by 6 aircrafts over the central plain of North China from July to ...
Li Yiyu, Sun Hongping, Yang Junmei, Ren Gang, Zhao Delong, Zhou Wei, Liu Zhichao   +6 more
doaj   +1 more source

Low-level stratiform clouds and dynamical features observed within the southern West African monsoon [PDF]

Atmospheric Chemistry and Physics, 2019
During the boreal summer, the monsoon season that takes place in West Africa is accompanied by low stratus clouds over land that stretch from the Guinean coast several hundred kilometers inland. Numerical climate and weather models need finer description
C. Dione, C. Dione, F. Lohou, M. Lothon, B. Adler, K. Babić, N. Kalthoff, X. Pedruzo-Bagazgoitia, Y. Bezombes, O. Gabella   +9 more
doaj   +1 more source

Satellite Fog Detection at Dawn and Dusk Based on the Deep Learning Algorithm under Terrain-Restriction

Remote Sensing, 2022
Fog generally forms at dawn and dusk, which exerts serious impacts on public traffic and human health. Terrain strongly affects fog formation, which provides a useful clue for fog detection from satellite observation.
Yinze Ran, Huiyun Ma, Zengwei Liu, Xiaojing Wu, Yanan Li, Huihui Feng   +5 more
doaj   +1 more source

Effects of varying aerosol regimes on low‐level Arctic stratus [PDF]

Geophysical Research Letters, 2004
The effects on low‐level cloud microstructures of varying aerosol regimes in the Arctic are examined using ground‐based measurements obtained near Barrow, Alaska. Episodic ‘arctic haze’ events produced high cloud droplet concentrations, and small cloud droplet effective radii.
T. J. Garrett, C. Zhao, X. Dong, G. G. Mace, P. V. Hobbs   +4 more
openaire   +1 more source

Using a holographic imager on a tethered balloon system for microphysical observations of boundary layer clouds [PDF]

Atmospheric Measurement Techniques, 2020
Conventional techniques to measure boundary layer clouds such as research aircraft are unable to sample in orographically diverse or densely populated areas.
F. Ramelli, A. Beck, J. Henneberger, U. Lohmann   +3 more
doaj   +1 more source

A new vertical coordinate formulation to improve forecasts of fog and low stratus in high-resolution numerical weather prediction models

, 2021
Fog and low stratus pose a major challenge for numerical weather prediction (NWP) models. Despite high resolution in the horizontal (~1 km) and vertical (~20 m), operational NWP models often fail to accurately predict fog and low stratus.
Stephanie Westerhuis, O. Fuhrer
semanticscholar   +1 more source

Numerical simulations of aerosol radiative effects and their impact on clouds and atmospheric dynamics over southern West Africa [PDF]

Atmospheric Chemistry and Physics, 2018
Southern West Africa (SWA) is undergoing rapid and significant socioeconomic changes associated with a massive increase in air pollution. Still, the impact of atmospheric pollutants, in particular that of aerosol particles, on weather and climate in ...
K. Deetz, H. Vogel, P. Knippertz, B. Adler, J. Taylor, H. Coe, K. Bower, S. Haslett, M. Flynn, J. Dorsey, I. Crawford, C. Kottmeier, B. Vogel   +12 more
doaj   +1 more source

Conceptual model of diurnal cycle of low-level stratiform clouds over southern West Africa [PDF]

Atmospheric Chemistry and Physics, 2020
The DACCIWA (Dynamics Aerosol Chemistry Cloud Interactions in West Africa) project and the associated ground-based field experiment, which took place during summer 2016, provided a comprehensive dataset on the low-level stratiform clouds (LLSCs), which ...
F. Lohou, N. Kalthoff, B. Adler, K. Babić, C. Dione, M. Lothon, X. Pedruzo-Bagazgoitia, M. Zouzoua   +7 more
doaj   +1 more source

Comparison of Time Domain and Spectral Domain Optical Coherence Tomography in Measurement of Macular Thickness in Macular Edema Secondary to Diabetic Retinopathy and Retinal Vein Occlusion

Journal of Ophthalmology, 2012
Purpose. To evaluate macular thickness, agreement, and intraclass repeatability in three optical coherence tomography (OCT) devices: the time domain (TD) Stratus OCT and two spectral domain (SD) OCTs, Spectralis and Cirrus SD-OCT, in eyes with macular ...
Elham Hatef, Afsheen Khwaja, Zubir Rentiya, Mohamed Ibrahim, Matthew Shulman, Peykan Turkcuoglu, Yasir Sepah, Jianmin Wang, Roomasa Channa, Millena Bittencourt, Abeer Akhtar, Jangwon Heo, Diana V. Do, Quan Dong Nguyen   +13 more
doaj   +1 more source