Results 11 to 20 of about 354,003 (282)

Mobile Robots for In-Process Monitoring of Aircraft Systems Assemblies

Sensors, 2022
Currently, systems installed on large-scale aerospace structures are manually equipped by trained operators. To improve current methods, an automated system that ensures quality control and process adherence could be used.
Marc Auledas-Noguera, Amer Liaqat, Ashutosh Tiwari   +2 more
doaj   +1 more source

Large emissions from floodplain trees close the Amazon methane budget [PDF]

, 2017
Wetlands are the largest global source of atmospheric methane (CH4), a potent greenhouse gas. However, methane emission inventories from the Amazon floodplain, the largest natural geographic source of CH4 in the tropics, consistently underestimate the ...
A Siegenthaler, AA Bloom, AA Bloom, AH Devol, AJ Webb, Alex Enrich-Prast, B Ringeval, C Frankenberg, C Frankenberg, C Wilson, Cassia Mônica Sakuragui, D Bastviken, David Bastviken, Edward R. C. Hornibrook, EM Latrubesse, Emanuel Gloor, F Keppler, GO Martinson, H Rusch, H Schaefer, HO Sawakuchi, Humberto Marotta, JB Miller, JM Melack, John Bharat Miller, KB Bartlett, L Belger, LL Hess, LL Hess, LS Santiago, Luana S. Basso, Luana Silva Braucks Calazans, Luciana V. Gatti, Olaf Malm, R Fisher, Roberta Bittencourt Peixoto, RR Draxler, S Kirschke, S Pitz, SR Pangala, SR Pangala, SR Pangala, Sunitha R. Pangala, Veronika Beck, Vincent Gauci, Wanderley Rodrigues Bastos, ZP Wang   +46 more
core   +1 more source

Development of a low-maintenance measurement approach to continuously estimate methane emissions: a case study [PDF]

, 2016
The chemical breakdown of organic matter in landfills represents a significant source of methane gas (CH4). Current estimates suggest that landfills are responsible for between 3% and 19% of global anthropogenic emissions. The net CH4 emissions resulting
Allen, Grant, Connors, Sarah, Davies, S., Hancock, B. R., Harris, Neil R. P., Pitt, Joseph, Riddick, Stuart N., Robinson, Andrew D.   +7 more
core   +1 more source

Effect of Carex rostrata on seasonal and interannual variability in peatland methane emissions [PDF]

, 2014
Peatlands are a large natural source of atmospheric methane (CH4), and the sedge Carex rostrata plays a critical role in the production, oxidation, and transport of CH4 in these systems.
Bubier, Jill L., Frolking, Steve, Noyce, Genevieve L, Varner, Ruth   +3 more
core   +2 more sources

Focus on the impact of climate change on wetland ecosystem and carbon dynamics [PDF]

, 2016
The renewed growth in atmospheric methane (CH4)since 2007 after a decade of stabilization has drawn much attention to its causes and future trends. Wetlands are the single largest source of atmospheric CH4.
Christensen, Torben R., Frolking, Stephen E., Meng, Lei, Roulet, Nigel, Zhuang, Qianlai   +4 more
core   +2 more sources

Application of concentration and 2-dimensional stable isotope measurements of methane to constrain sources and sinks in a seasonally stratified freshwater lake

Frontiers in Environmental Science, 2022
Methane (CH4) emissions from aquatic systems have recently been comprised to account for up to 50% of global CH4 emissions, with lakes representing one of the largest CH4 sources within this pool.
Teresa Einzmann, Teresa Einzmann, Moritz Schroll, Jan F. Kleint, Jan F. Kleint, Markus Greule, Frank Keppler, Frank Keppler   +7 more
doaj   +1 more source

Assessing connectivity between an overlying aquifer and a coal seam gas resource using methane isotopes, dissolved organic carbon and tritium [PDF]

, 2015
Coal seam gas (CSG) production can have an impact on groundwater quality and quantity in adjacent or overlying aquifers. To assess this impact we need to determine the background groundwater chemistry and to map geological pathways of hydraulic ...
A Green-Saxena, A Vengosh, BE Fontenot, BFJ Kelly, C Duvert, CD Keeling, CD Keeling, DDR Owen, DE Pataki, DL Valentine, DT Maher, E Dafny, ECP Kinnon, EG Nisbet, EJ Dlugokencky, G Antler, JA Hakala, JF Barker, JW Roy, K Knittel, MJ Whiticar, NG Phillips, P Quay, RB Jackson, RE Fisher, S Cuna, S Qin, SG Osborn, SK Hamilton, SK Hamilton, SL Papendick, TA Moore   +31 more
core   +1 more source

Mass fluxes and isofluxes of methane (CH4) at a New Hampshire fen measured by a continuous wave quantum cascade laser spectrometer [PDF]

, 2012
We have developed a mid‐infrared continuous‐wave quantum cascade laser direct‐absorption spectrometer (QCLS) capable of high frequency (≥1 Hz) measurements of 12CH4 and 13CH4 isotopologues of methane (CH4) with in situ 1‐s RMS image precision of 1.5 ...
Crill, Patrick M., Goodrich, Jordan P., Lee, Ben H., McManus, J. Barry, Nelson, David D., Santoni, Gregory W., Varner, Ruth K., Wofsy, Steven C., Zahniser, Mark S.   +8 more
core   +3 more sources

Methane in Lakes: Variability in Stable Carbon Isotopic Composition and the Potential Importance of Groundwater Input

Frontiers in Earth Science, 2021
Methane (CH4) is an important component of the carbon (C) cycling in lakes. CH4 production enables carbon in sediments to be either reintroduced to the food web via CH4 oxidation or emitted as a greenhouse gas making lakes one of the largest natural ...
Jonathan Schenk, Henrique O. Sawakuchi, Anna K. Sieczko, Gustav Pajala, David Rudberg, Emelie Hagberg, Kjell Fors, Hjalmar Laudon, Jan Karlsson, David Bastviken   +9 more
doaj   +1 more source

Dynamics of methane ebullition from a peat monolith revealed from a dynamic flux chamber system [PDF]

, 2014
Methane (CH4) ebullition in northern peatlands is poorly quantified in part due to its high spatiotemporal variability. In this study, a dynamic flux chamber (DFC) system was used to continuously measure CH4 fluxes from a monolith of near‐surface ...
Reeve, Andrew S., Schafer, Karina V. R., Slater, Lee D., Varner, Ruth K., Yu, Zhongjie   +4 more
core   +3 more sources