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Lignin signatures of vegetation and soils in tropical environments
Belanger, E.,Lucotte, M.,Gregoire, B.,Moingt, M.,Paquet, S.,Davidson, R.,Mertens, F.,Passos, C.J.S.,Romana, C. Techno-Press 2015 Advances in environmental research Vol.4 No.4
The few lignin biomarker studies conducted in tropical environments are hampered by having to use references signatures established for plants and soils characteristic of the temperate zone. This study presents a lignin biomarker analysis (vanillyls (V), p-hydroxyls (P), syringyls (S), cinnamyls (C)) of the dominant plant species and soil horizons as well as an analysis of the interrelated terrigenous organic matter (TOM) dynamics between vegetation and soil of the $Tapaj{\acute{o}}s$ river region, an active colonization front in the Brazilian Amazon. We collected and analyzed samples from 17 fresh dominant plant species and 48 soil cores at three depths (0-5 cm, 20-25 cm, 50-55 cm) from primary rainforest, fallow forest, subsistence agriculture fields and pastures. Lignin signatures in tropical plants clearly distinguish from temperate ones with high ratios of Acid/aldehyde of vanillyls ((Ad/Al)v) and P/V+S. Contrary to temperate environments, similarly high ratios in tropical soils are not related to TOM degradation along with pedogenesis but to direct influence of plants growing on them. Lignin signatures of both plants and soils of primary rainforest and fallow forest clearly distinguish from those of non-forested areas, i.e., agriculture fields and pastures. Attalea speciosa Palm trees, an invasive species in all perturbed landscapes of the Amazon, exhibit lignin signatures clearly distinct from other dominant plant species. The study of lignin signatures in tropical areas thus represents a powerful tool to evaluate the impact of primary rainforest clearing on TOM dynamics in tropical areas.
Periodic Solutions of a Delayed Population Model with One Predator and Two Preys
Rui Xu,M. A. J. Chaplain,F. A. Davidson 경북대학교 자연과학대학 수학과 2004 Kyungpook mathematical journal Vol.44 No.4
A delayed periodic Lotka-Volterra predator-prey model with one predator and two preys is investigated. By using Gaines and Mawhin’s continuation theorem of coincidence degree theory and by constructing appropr iate Lyapunov functionals, a set ofeasily veriable sufficient conditions are derived for the existence, uniqueness and global stability of positive periodic solutions to the model.
'Looking into' chemical products and processes
Lynn F. Gladden,C. Buckley,P. S. Chow,J. F. Davidson,M. D. Mantle,J. Sederman 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
Nuclear magnetic resonance spectroscopy has long been established as a probe of the.A- and nm-scale chemistry and dynamics ofmolecules in the solid, glassy, gel, liquid and gas states. In the medical eld, the use of magnetic resonance imaging is now routineand will be found in most hospitals as a probe of the internal structure and blood ow within the human body. By bringing these two.families’ of magnetic resonance (MR) techniques together we have a powerful new set of tools with which to understand thefundamental physical and chemical processes that underpin our ability to formulate and manufacture materials with well-denedproperties. This article summarises some of the state-of-the-art developments and applications of MR techniques with particularapplication to obtaining new insights and strategies for controlling product properties through chemical process design. The use ofultra-fast MR techniques to study unsteady state multi-phase, multi-component processes is identied as oering exciting oppor-tunities in controlling properties during materials synthesis and subsequent processing.
Commissioning Status of the Linac for the Facility for Rare Isotope Beams
Lidia S.,Ao H.,Barnes B.,Bennett R.,Bernal-Ruiz E.,Bollen G.,Brandon J.,Bull B.,Bultman N.,Casagrande F.,Chabot D.,Cogan S.,Compton C.,Davidson K.,Daykin E.,Georgiobani D.,Gibson P.,Grender I.,Kim S.- 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.5
The Facility for Rare Isotope Beams will be completed in late 2021. We report here on the current efforts to commission the first stages of the 200-MeV/u superconducting, continuous wave heavy-ion linac. The statuses of the cryogenic plant and its distribution system, the accelerator cryomodule commissioning and operations, the ion source and front end transport development, the radio-frequency quadrupole commissioning, and thenbeam dynamics development to support high-power operation are reviewed. Plans for commissioning the remainder of the linac systems are presented.