Upendra N. Singh
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View article: Teff Yield and Nutrient Uptake Partitioning During Prolonged Waterlogging: A Preliminary Greenhouse Study
Teff Yield and Nutrient Uptake Partitioning During Prolonged Waterlogging: A Preliminary Greenhouse Study Open
There is a lack of studies examining the effects of prolonged waterlogging on both yield and nutrient uptake partitioning in teff. A greenhouse study was conducted to assess the impact of different durations of waterlogging on teff's growt…
View article: Unraveling the contribution of G x E x M interactions to maize productivity in Central Mozambique amid climate change
Unraveling the contribution of G x E x M interactions to maize productivity in Central Mozambique amid climate change Open
Maize (Zea mays L.) is the most important cereal staple in sub-Saharan Africa. Yet, smallholders only produce about 20% of what is biophysically possible with agronomic best practices. On-farm researcher- and farmer-managed experiments wer…
View article: Teff ( <i>Eragrostis tef</i> ) dry matter yield, nutrient uptake partitioning, and nitrogen use efficiency indices affected by nitrogen rate under balanced fertilization
Teff ( <i>Eragrostis tef</i> ) dry matter yield, nutrient uptake partitioning, and nitrogen use efficiency indices affected by nitrogen rate under balanced fertilization Open
Teff [Eragrostis tef (Zucc.) Trotter] has gained high demand and popularity across the world in recent years. Data on nutrient uptake and partitioning and nitrogen use efficiency (NUE) indices of teff under balanced fertilization are scarc…
View article: Airborne Testing of 2-μm Pulsed IPDA Lidar for Active Remote Sensing of Atmospheric Carbon Dioxide
Airborne Testing of 2-μm Pulsed IPDA Lidar for Active Remote Sensing of Atmospheric Carbon Dioxide Open
The capability of an airborne 2-μm integrated path differential absorption (IPDA) lidar for high-accuracy and high-precision active remote sensing of weighted-average column dry-air volume mixing ratio of atmospheric carbon dioxide (XCO2) …
View article: Laser Remote Sensors for NASA’s Future Earth and Space Science Missions
Laser Remote Sensors for NASA’s Future Earth and Space Science Missions Open
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 re…
View article: MCT APD Detection System for Atmospheric Profiling Applications Using Two-Micron Lidar
MCT APD Detection System for Atmospheric Profiling Applications Using Two-Micron Lidar Open
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-eq…
View article: Flight Demonstration of a 2-Micron, Double Plused CO<sub>2</sub> IPDA Lidar Instrument
Flight Demonstration of a 2-Micron, Double Plused CO<sub>2</sub> IPDA Lidar Instrument Open
NASA Langley Research Center (LaRC) developed a double pulsed, high energy 2-micron Integrated Path Differential Absorption (IPDA) lidar instrument to measure atmospheric CO 2 column density. The 2-μm double pulsed IPDA lidar was flown ten…
View article: Second International Workshop on Space-Based Lidar Remote Sensing Techniques and Emerging Technologies [Technical Committees]
Second International Workshop on Space-Based Lidar Remote Sensing Techniques and Emerging Technologies [Technical Committees] Open
Presents information on the Second International Workshop on Space-Based Lidar Remote Sensing Techniques and Emerging Technologies.
View article: Evaluation of 2-<i>μ</i>m Pulsed Integrated Path Differential Absorption Lidar for Carbon Dioxide Measurement—Technology Developments, Measurements, and Path to Space
Evaluation of 2-<i>μ</i>m Pulsed Integrated Path Differential Absorption Lidar for Carbon Dioxide Measurement—Technology Developments, Measurements, and Path to Space Open
The societal benefits of understanding climate change through the identification of global carbon dioxide sources and sinks led to the recommendation for NASA's Active Sensing of Carbon Dioxide Emissions over Nights, Days, and Seasons spac…
View article: Space-based active optical remote sensing of carbon dioxide column using high-energy two-micron pulsed ipda lidar
Space-based active optical remote sensing of carbon dioxide column using high-energy two-micron pulsed ipda lidar Open
Modeling of a space-based high-energy 2-μm triple-pulse Integrated Path Differential Absorption (IPDA) lidar was conducted to demonstrate carbon dioxide (CO 2 ) measurement capability and to evaluate random and systematic errors. A high pu…
View article: Airborne Two-Micron Double-Pulse IPDA Lidar Validation for Carbon Dioxide Measurements Over Land
Airborne Two-Micron Double-Pulse IPDA Lidar Validation for Carbon Dioxide Measurements Over Land Open
An airborne double-pulse 2-μm Integrated Path Differential Absorption (IPDA) lidar has been developed at NASA LaRC for measuring atmospheric CO 2 . IPDA was validated using NASA B-200 aircraft over land and ocean under different conditions…
View article: Development of an advanced Two-Micron triple-pulse IPDA lidar for carbon dioxide and water vapor measurements
Development of an advanced Two-Micron triple-pulse IPDA lidar for carbon dioxide and water vapor measurements Open
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 (CO 2 ) and water vapor (H 2 O) measurements simultaneously a…
View article: High-energy, 2µm laser transmitter for coherent wind LIDAR
High-energy, 2µm laser transmitter for coherent wind LIDAR Open
A coherent Doppler lidar at 2μm wavelength has been built with higher output energy (300 mJ) than previously available. The laser transmitter is based on the solid-state Ho:Tm:LuLiF, a NASA Langley Research Center invented laser material f…
View article: Development and evaluation of a high sensitivity dial system for profiling atmospheric CO2
Development and evaluation of a high sensitivity dial system for profiling atmospheric CO2 Open
A ground-based 2-micron Differential Absorption Lidar (DIAL) CO2 profiling system for atmospheric boundary layer studies and validation of space-based CO2 sensors is being developed and tested at NASA Langley Research…
View article: Column Co2 measurement from an airborne solid state double-pulsed 2-micron integrated path differential absorption lidar
Column Co2 measurement from an airborne solid state double-pulsed 2-micron integrated path differential absorption lidar Open
NASA LaRC is developing and integrating a double-Pulsed 2-micron direct detection IPDA lidar for CO2 column measurement from an airborne platform. The presentation will describe the development of the 2-micrometers IPDA lidar system and pr…
View article: Column carbon dioxide and water vapor measurements by an airborne triple-pulse integrated path differential absorption lidar – novel lidar technologies and techniques with path to space
Column carbon dioxide and water vapor measurements by an airborne triple-pulse integrated path differential absorption lidar – novel lidar technologies and techniques with path to space Open
The 2-micron wavelength region is suitable for atmospheric carbon dioxide (CO2) measurements due to the existence of distinct absorption features for the gas at this wavelength region [1]. For more than 20 years, researchers at …
View article: Progress on development of an airborne two-micron IPDA lidar for water vapor and carbon dioxide column measurements
Progress on development of an airborne two-micron IPDA lidar for water vapor and carbon dioxide column measurements Open
An airborne 2 micron triple-pulse integrated path differential absorption (IPDA) lidar is currently under development at NASA Langley Research Center (LaRC). This lidar targets both atmospheric carbon dioxide (CO2) and water vapor (H2O) co…
View article: Feasibility study of a space-based high pulse energy 2 μm CO_2 IPDA lidar
Feasibility study of a space-based high pulse energy 2 μm CO_2 IPDA lidar Open
Sustained high-quality column carbon dioxide (CO2) atmospheric measurements from space are required to improve estimates of regional and continental-scale sources and sinks of CO2. Modeling of a space-based 2 μm, high…
View article: Novel Technique and Technologies for Active Optical Remote Sensing of Greenhouse Gases
Novel Technique and Technologies for Active Optical Remote Sensing of Greenhouse Gases Open
The societal benefits of understanding climate change through identification of global carbon dioxide sources and sinks led to the desired NASA's active sensing of carbon dioxide emissions over nights, days, and seasons (ASCENDS) space-bas…
View article: Active Optical Remote Sensor for Carbon dioxide and Water Vapor Measurement from an Air and Space-borne Platform
Active Optical Remote Sensor for Carbon dioxide and Water Vapor Measurement from an Air and Space-borne Platform Open
Challenges towards development and demonstration of an airborne 2-μm triple-pulse integrated path differential absorption (IPDA) lidar for simultaneous measurements of carbon dioxide and water vapor column measurements from air and space-b…
View article: Development of Double-Pulsed Two-Micron Laser for Atmospheric Carbon Dioxide Measurements
Development of Double-Pulsed Two-Micron Laser for Atmospheric Carbon Dioxide Measurements Open
A CO2 lidar double-pulse two-micron high-energy transmitter, tuned to on- and off-line absorption wavelengths, has been developed. Transmitter operation and performance has been verified on ground and airborne platform.
View article: 2-micron triple-pulse integrated path differential absorption lidar development for simultaneous airborne column measurements of carbon dioxide and water vapor in the atmosphere
2-micron triple-pulse integrated path differential absorption lidar development for simultaneous airborne column measurements of carbon dioxide and water vapor in the atmosphere Open
For more than 15 years, NASA Langley Research Center (LaRC) has contributed in developing several 2-micron carbon dioxide active remote sensors using the DIAL technique. Currently, an airborne 2-micron triple-pulse integrated path differen…
View article: Triple-Pulsed Two-Micron Integrated Path Differential Absorption Lidar: A New Active Remote Sensing Capability with Path to Space
Triple-Pulsed Two-Micron Integrated Path Differential Absorption Lidar: A New Active Remote Sensing Capability with Path to Space Open
The two-micron wavelength is suitable for monitoring atmospheric water vapor and carbon dioxide, the two most dominant greenhouse gases. Recent advances in 2-micron laser technology paved the way for constructing state-of-the-art lidar tra…
View article: Active Optical Remote Sensing Sensors/Instrumentations for NASA’s Future Earth Science Missions
Active Optical Remote Sensing Sensors/Instrumentations for NASA’s Future Earth Science Missions Open
This presentation will provide an overview of enabling active optical remote sensing technologies and techniques, NASA's future vision for Earth science missions for global observations, and the challenges associated in applying them for s…
View article: Double-Pulse Two-micron LPDA Lidar Simulation for Airborne Carbon Dioxide Measurements
Double-Pulse Two-micron LPDA Lidar Simulation for Airborne Carbon Dioxide Measurements Open
An advanced double-pulse 2-μm integrated path differential absorption lidar has been developed at NASA Langley Research Center for measuring atmospheric carbon dioxide. The instrument utilizes a state-of-the-art 2-μm laser transmitter with…
View article: Airborne 2-Micron Double Pulsed Direct Detection IPDA Lidar for Atmospheric CO<sub>2</sub>Measurement
Airborne 2-Micron Double Pulsed Direct Detection IPDA Lidar for Atmospheric CO<sub>2</sub>Measurement Open
An airborne 2-micron double-pulsed Integrated Path Differential Absorption (IPDA) lidar has been developed for atmospheric CO2 measurements. This new instrument has been flown in spring of 2014 for a total of ten flights with 27 flight hou…
View article: Quantification of ionic impurities in process liquor using inductively coupled plasma spectrometer and capillary electrophoresis
Quantification of ionic impurities in process liquor using inductively coupled plasma spectrometer and capillary electrophoresis Open
Analytical Research Division, Jawaharlal Nehru Aluminium Research Development and Design Centre, Amaravati Road, Wadi, Nagpur-440 023, Maharashtra, India E-mail : [email protected] Manuscript received online 22 September, …
View article: A Novel Triple-Pulsed 2-micrometer Lidar for Simultaneous and Independent CO2 and H2O Column Measurement
A Novel Triple-Pulsed 2-micrometer Lidar for Simultaneous and Independent CO2 and H2O Column Measurement Open
The study of global warming needs precisely and accurately measuring greenhouse gases concentrations in the atmosphere. CO2 and H2O are important greenhouse gases that significantly contribute to the carbon cycle and global radiation budge…
View article: Twenty years of Tm:Ho:YLF and LuLiF laser development for global wind and carbon dioxide active remote sensing
Twenty years of Tm:Ho:YLF and LuLiF laser development for global wind and carbon dioxide active remote sensing Open
NASA Langley Research Center (LaRC) has a long history of developing pulsed 2-μm lasers. From fundamental spectroscopy research, theoretical prediction of new materials, laser demonstration and engineering of lidar systems, it has been a v…