Results 21 to 30 of about 453,439 (329)
Frontiers in Microbiology, 2017 Despite the high relevance of anaerobic ammonium oxidation (anammox) for nitrogen loss from marine systems, its relative importance compared to denitrification has less been studied in freshwater ecosystems, and our knowledge is especially scarce for ...
Swatantar Kumar +10 more
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Examination of the seepage face boundary condition in subsurface and coupled surface/subsurface hydrological models [PDF]
, 2017 A seepage face is a nonlinear dynamic boundary that strongly affects pressure head distributions, water table fluctuations, and flow patterns. Its handling in hydrological models, especially under complex conditions such as heterogeneity and coupled ...
Paniconi, Claudio +3 more
core +2 more sources
An Ionic Limit to Life in the Deep Subsurface
Frontiers in Microbiology, 2019 The physical and chemical factors that can limit or prevent microbial growth in the deep subsurface are not well defined. Brines from an evaporite sequence were sampled in the Boulby Mine, United Kingdom between 800 and 1300 m depth.
Samuel J. Payler +7 more
doaj +1 more source
, 2007 We study the atomic oxygen adsorption on Pb(111) surface by using density-functional theory within the generalized gradient approximation and a supercell approach.
Bo Sun +9 more
core +1 more source
Habitability of Mars: How Welcoming Are the Surface and Subsurface to Life on the Red Planet?
Geosciences, 2019 Mars is a planet of great interest in the search for signatures of past or present life beyond Earth. The years of research, and more advanced instrumentation, have yielded a lot of evidence which may be considered by the scientific community as proof of
Aleksandra Checinska Sielaff +1 more
doaj +1 more source
Upper ocean climate of the Eastern Mediterranean Sea during the Holocene Insolation Maximum – a model study [PDF]
, 2011 ine thousand years ago (9 ka BP), the Northern Hemisphere experienced enhanced seasonality caused by an orbital configuration close to the minimum of the precession index.
Adloff, F. +6 more
core +2 more sources
Mechanized and irrigated coffee cultivation promotes physical subsurface constraints in Oxisols [PDF]
Revista Brasileira de Ciência do SoloSoils of the Cerrados (Brazilian Savanna) are deep, well-structured, and well-drained, with flat to gently undulating terrain that favors mechanization for coffee cultivation. However, these soils are susceptible to compaction. This study aimed to assess
Katherine Martinez Escobar +4 more
doaj +1 more source
Direct subsurface absorption of hydrogen on Pd(111)
, 1995 We summarize and discuss some of the available experimental and theoretical data important for understanding the role played by subsurface sites in dissociative chemisorption calculations for the H$_2$/Pd(111) system.
Løvvik, Ole Martin +1 more
core +2 more sources
The Johnson homomorphism and its kernel [PDF]
, 2015 We give a new proof of a celebrated theorem of Dennis Johnson that asserts that the kernel of the Johnson homomorphism on the Torelli subgroup of the mapping class group is generated by separating twists. In fact, we prove a more general result that also
Putman, Andrew
core +1 more source
Advanced Engineering Materials, EarlyView.Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt +8 more
wiley +1 more source