Zobrazeno 1 - 10
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pro vyhledávání: '"Singh Upendra"'
The inversion of DC resistivity data is a widely employed method for near-surface characterization. Recently, deep learning-based inversion techniques have garnered significant attention due to their capability to elucidate intricate non-linear relat
Externí odkaz:
http://arxiv.org/abs/2408.02420
Joint inversion of geophysical datasets is instrumental in subsurface characterization and has garnered significant popularity, leveraging information from multiple geophysical methods. In this study, we implemented the joint inversion of DC resistiv
Externí odkaz:
http://arxiv.org/abs/2408.02414
Autor:
Yu Jirong, Petros Mulugeta, Singh Upendra, Refaat Tamer, Reithmaier Karl, Remus Ruben, Johnson William
Publikováno v:
EPJ Web of Conferences, Vol 237, p 03013 (2020)
NASA Langley Research Center (LaRC) developed a double pulsed, high energy 2-micron Integrated Path Differential Absorption (IPDA) lidar instrument to measure atmospheric CO2 column density. The 2-μm double pulsed IPDA lidar was flown ten times in M
Externí odkaz:
https://doaj.org/article/6b094465ea7c41229c79618b4986268f
Autor:
Singh Upendra N.
Publikováno v:
EPJ Web of Conferences, Vol 237, p 01011 (2020)
Active optical (Laser/Lidar) measurement techniques are critical for the future National Aeronautics and Space Administration (NASA) Earth, Planetary Science, Exploration, and Aeronautics measurements. The latest science decadal surveys recommend a n
Externí odkaz:
https://doaj.org/article/aab8b80dabb14fb8ba877ff5a7b884fa
Publikováno v:
EPJ Web of Conferences, Vol 237, p 01013 (2020)
An advanced detection system, based on mercury cadmium telluride avalanche photodiodes array, was implemented within a 2-μm lidar. Detection system characterization was conducted for performance evaluation including settling time, noise-equivalent-p
Externí odkaz:
https://doaj.org/article/0d289022a16b4ba29666f8656d66c0d1
Publikováno v:
EPJ Web of Conferences, Vol 176, p 05001 (2018)
An airborne double-pulse 2-μm Integrated Path Differential Absorption (IPDA) lidar has been developed at NASA LaRC for measuring atmospheric CO2. IPDA was validated using NASA B-200 aircraft over land and ocean under different conditions. IPDA evalu
Externí odkaz:
https://doaj.org/article/3880a72dc13b4ff0a0e1513a4d596762
Autor:
Singh Upendra N., Refaat Tamer F., Ismail Syed, Petros Mulugeta, Davis Kenneth J., Kawa Stephan R., Menzies Robert T.
Publikováno v:
EPJ Web of Conferences, Vol 176, p 02001 (2018)
Modeling of a space-based high-energy 2-μm triple-pulse Integrated Path Differential Absorption (IPDA) lidar was conducted to demonstrate carbon dioxide (CO2) measurement capability and to evaluate random and systematic errors. A high pulse energy l
Externí odkaz:
https://doaj.org/article/709c87c0f0f44aebab53db34c0e57b90
Autor:
Petros Mulugeta, Refaat Tamer F., Singh Upendra N., Yu Jirong, Antill Charles, Remus Ruben, Taylor Bryant D., Wong Teh-Hwa, Reithmaier Karl, Lee Jane, Ismail Syed, Davis Kenneth J
Publikováno v:
EPJ Web of Conferences, Vol 176, p 01009 (2018)
An advanced airborne triple-pulse 2-μm integrated path differential absorption (IPDA) lidar is under development at NASA Langley Research Center that targets both carbon dioxide (CO2) and water vapor (H2O) measurements simultaneously and independent
Externí odkaz:
https://doaj.org/article/e07f3206bfc1448b98971bf40386eb0d
Publikováno v:
Healthcare in Low-resource Settings, Vol 1, Iss 1, Pp e11-e11 (2013)
Lightning injury is a global public health problem. It still exists as a major environmental threat in developing nations where majority of population lives in rural areas. The different mechanisms of lightning injury can result in a spectrum of inju
Externí odkaz:
https://doaj.org/article/80a7c64084ba42228f684a18d78e519b
Publikováno v:
EPJ Web of Conferences, Vol 119, p 02001 (2016)
The two-micron wavelength is suitable for monitoring atmospheric water vapor and carbon dioxide, the two most dominant greenhouse gases. Recent advances in 2-μm laser technology paved the way for constructing state-of-the-art lidar transmitters for
Externí odkaz:
https://doaj.org/article/4ae3ca0908f34a5696c375d365ac6bae