Results 41 to 50 of about 453,439 (329)

Helioseismology of Sunspots: A Case Study of NOAA Region 9787 [PDF]

, 2008
Various methods of helioseismology are used to study the subsurface properties of the sunspot in NOAA Active Region 9787. This sunspot was chosen because it is axisymmetric, shows little evolution during 20-28 January 2002, and was observed continuously ...
A. C. Birch, A.C. Birch, A.C. Donea, A.D. Crouch, A.G. Kosovichev, B.W. Hindman, C. Lindsey, C. Lindsey, C. S. Baldner, D. C. Braun, D.C. Braun, D.C. Braun, D.C. Braun, D.C. Braun, D.C. Braun, D.C. Braun, D.C. Braun, D.C. Braun, D.C. Braun, E.N. Parker, F. Hill, H. Schunker, H. Schunker, H.C. Spruit, H.M. Antia, J. Christensen-Dalsgaard, J. Jackiewicz, J. Jackiewicz, J. Jackiewicz, J. Jackiewicz, J. Zhao, J.M. Jensen, J.M. Jensen, J.M. Jensen, K. Parchevsky, L. Gizon, L. Gizon, L. Gizon, L. Gizon, L. Gizon, M. J. Thompson, M. Roth, M. Schüssler, M.F. Woodard, M.J. Thompson, N.S. Brickhouse, O.V. Ladenkov, P.S. Cally, P.S. Cally, R. Cameron, R. Cameron, R. Cameron, R. S. Bogart, R.S. Bogart, S. Basu, S. Basu, S. Couvidat, S. Couvidat, S. M. Hanasoge, S. Zharkov, S.K. Solanki, S.M. Hanasoge, S.P. Rajaguru, S.P. Rajaguru, T. L. Duvall, T. Stahn, T.J. Bogdan, T.L. Duvall Jr., T.L. Duvall Jr., T.L. Duvall Jr., Y. Fan   +70 more
core   +3 more sources

Atomically Revealing Bulk Point Defect Dynamics in Hydrogen‐Driven γ‐Fe2O3 → Fe3O4 → FeO Transformation

Advanced Functional Materials, EarlyView.
In situ TEM uncovers the atomic‐scale mechanisms underlying hydrogen‐driven γ‐Fe2O3→Fe3O4→FeO reduction. In γ‐Fe2O3, oxygen vacancies cluster around intrinsic Fe vacancies, leading to nanopore formation, whereas in Fe3O4, vacancy aggregation is suppressed, preserving a dense structure.
Yupeng Wu, Dongxiang Wu, Wenhui Zhu, Xiaobo Chen, Zhikang Zhou, Zhilu Liang, Shuonan Ye, Meng Li, Xiao Tong, Kim Kisslinger, Sooyeon Hwang, Dmitri Zakharov, Renu Sharma, Judith C. Yang, Guangwen Zhou   +14 more
wiley   +1 more source

Mechanisms of sand production, prediction–a review and the potential for fiber optic technology and machine learning in monitoring

Journal of Petroleum Exploration and Production Technology
Sand control is an ongoing challenge in numerous hydrocarbon-producing wells in sand-rich reservoirs. Sand production in these wells can cause damage to equipment, reduce production rates, and lead to erosion that can damage subsea equipment, production ...
Dejen Teklu Asfha, Abdul Halim Abdul Latiff, Daniel Asante Otchere, Bennet Nii Tackie-Otoo, Ismailalwali Babikir, Muhammad Rafi, Zaky Ahmad Riyadi, Ahmad Dedi Putra, Bamidele Abdulhakeem Adeniyi   +8 more
doaj   +1 more source

Assessing the impact of subsurface temperature observations from fishing vessels on temperature and heat content estimates in shelf seas: a New Zealand case study using Observing System Simulation Experiments

Frontiers in Marine Science
We know that extremes in ocean temperature often extend below the surface, and when these extremes occur in shelf seas they can significantly impact ecosystems and fisheries.
Colette Kerry, Moninya Roughan, Joao Marcos Azevedo Correia de Souza   +2 more
doaj   +1 more source

Potential for nitrogen fixation and nitrification in the granite-hosted subsurface at Henderson Mine, CO

Frontiers in Microbiology, 2011
The existence of life in the deep terrestrial subsurface is established, yet few studies have investigated the origin of nitrogen that supports deep life.
Elizabeth eSwanner, Elizabeth eSwanner, Alexis eTempleton   +2 more
doaj   +1 more source

Interpretation of aeromagnetic and remote sensing data of Auchi and Idah sheets of the Benin-arm Anambra basin: Implication of mineral resources

Open Geosciences, 2023
The need for mineral resources for economic development is key in both developing and developed countries. However, miners usually resort to random excavation of mineral deposits without proper investigation to identify structures of interest in target ...
Oni Olubukola A., Alimi Sodiq A., Aizebeokhai Ahzegbobor P., Boyo Henry O.   +3 more
doaj   +1 more source

Observation-based temperature field simulation at Zhurong landing site, Mars

Frontiers in Astronomy and Space Sciences, 2022
Modeling the temperature field near the Martian surface is critical for many scientific exploration tasks, such as detecting liquid water and analyzing the existence of saline ice.
Lei Zhang, Lei Zhang, Lei Zhang, Lei Zhang, Jinhai Zhang, Jinhai Zhang, Jinhai Zhang, Jinhai Zhang   +7 more
doaj   +1 more source

Swept-frequency UHF radiometer for deep probes of earth - A concept [PDF]

, 1970
Radiometer, developed for use on moon or planets, could be used to - determine layering and structure as deep as 100 feet below earth surface, determine physical properties of subsurface by variation of dielectric constants, identify types of materials ...
Koppl, W.
core   +1 more source

The need for improved management of the subsurface [PDF]

, 2010
The subsurface is used intensively to support economic stability and growth. Human interaction with the shallow subsurface ranges from exploitation of resources, accommodation of utilities, harnessing of energy (ground source heat pumps) and storage of
Gunnink, Jan, Harms, Egon, Kessler, Holger, Ludwig, Rudiger, Moore, Roger, Sobisch, Hans-Georg, Terrington, Ricky L., Turner, Keith   +7 more
core   +1 more source

Synergistic Compatibilization of CsPbBr3 Perovskites and HfO2 Nanocrystals for Hybrid Sensitized Nanoscintillators

Advanced Functional Materials, EarlyView.
Lead halide perovskite nanocrystals are promising scintillators but suffer from reabsorption losses and limited compatibility with high‐Z additives. Hybridization of CsPbBr3 nanocrystals with PbBr2‐passivated HfO2 nanoparticle sensitizers, achieved during or after synthesis, produces stable composites with maintained optical quality, improved ...
Francesco Bruni, Saptarshi Chakraborty, Andrea Fratelli, Abdessamad El Adel, Jordi Llusar, Francesco Carulli, Matteo L. Zaffalon, Chenger Wang, Vojtech Zabloudil, Etiennette Auffray, Francesco Meinardi, Leonardo Poletti, Laura Lazzarini, Daniela Manno, Anna Galli, Francesca Rossi, Ivan Infante, Sergio Brovelli   +17 more
wiley   +1 more source