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- Lauritzen, P. H., et al.
(author)
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Reconciling and Improving Formulations for Thermodynamics and Conservation Principles in Earth System Models (ESMs)
- 2022
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In: Journal of Advances in Modeling Earth Systems. - 1942-2466. ; 14:9
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Journal article (peer-reviewed)abstract
- This paper provides a comprehensive derivation of the total energy equations for the atmospheric components of Earth System Models (ESMs). The assumptions and approximations made in this derivation are motivated and discussed. In particular, it is emphasized that closing the energy budget is conceptually challenging and hard to achieve in practice without resorting to ad hoc fixers. As a concrete example, the energy budget terms are diagnosed in a realistic climate simulation using a global atmosphere model. The largest total energy errors in this example are spurious dynamical core energy dissipation, thermodynamic inconsistencies (e.g., coupling parameterizations with the host model) and missing processes/terms associated with falling precipitation and evaporation (e.g., enthalpy flux between components). The latter two errors are not, in general, reduced by increasing horizontal resolution. They are due to incomplete thermodynamic and dynamic formulations. Future research directions are proposed to reconcile and improve thermodynamics formulations and conservation principles.
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| 2. |
- Li, Shunyi, et al.
(author)
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Intrinsic energy band alignment of functional oxides
- 2014
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In: Physica Status Solidi - Rapid Research Letetrs. - : Wiley. - 1862-6254 .- 1862-6270. ; 8:6, s. 571-576
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Journal article (peer-reviewed)abstract
- The energy band alignment at interfaces between different materials is a key factor, which determines the function of electronic devices. While the energy band alignment of conventional semiconductors is quite well understood, systematic experimental studies on oxides are still missing. This work presents an extensive study on the intrinsic energy band alignment of a wide range of functional oxides using photoelectron spectroscopy with in-situ sample preparation. The studied materials have particular technological importance in diverse fields as solar cells, piezotronics, multiferroics, photoelectrochemistry and oxide electronics. Particular efforts have been made to verify the validity of transitivity, in order to confirm the intrinsic nature of the obtained band alignment and to understand the underlying principles. Valence band offsets up to 1.6 eV are observed. The large variation of valence band maximum energy can be explained by the different orbital contributions to the density of states in the valence band. The framework provided by this work enables the general understanding and prediction of energy band alignment at oxide interfaces, and furthermore the tailoring of energy level matching for charge transfer in functional oxides. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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| 5. |
- Radulov, I. A., et al.
(author)
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Production of net-shape Mn-Al permanent magnets by electron beam melting
- 2019
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In: Additive Manufacturing. - : Elsevier BV. - 2214-8604 .- 2214-7810. ; 30
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Journal article (peer-reviewed)abstract
- The main goal of this work is the adoption of additive manufacturing for the production of inexpensive rare-earth free MnAl-based permanent magnets. The use of more advanced binder-free additive manufacturing technique such as Electron Beam Melting (EBM) allows obtaining fully-dense magnetic materials with advanced topology and complex shapes. We focus on the feasibility of controlling the phase formation in additively manufactured Mn-Al alloys by employing post-manufacturing heat treatment. The as-manufactured EBM samples contain 8% of the desired ferromagnetic τ-MnAl phase. After the optimized annealing treatment, the content of the τ-phase was increased to 90%. This sample has a coercivity value of 0.15 T, which is also the maximum achieved in conventionally produced binary MnAl magnets. Moreover, the EBM samples are fully dense and have the same density as the samples produced by conventional melting density.
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| 6. |
- Rampuria, Sakshi, et al.
(author)
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Pathogen-induced AdDjSKI of the wild peanut, Arachisdiogoi, potentiates tolerance of multiple stresses in E. coli andtobacco
- 2018
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In: Plant Science. - : Elsevier BV. - 0168-9452. ; 272, s. 62-74
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Journal article (peer-reviewed)abstract
- A gene encoding a serine-rich DnaJIII protein called AdDjSKI that has a 4Fe-4S cluster domain was found to be differentially upregulated in the wild peanut, Arachis diogoi in its resistance responses against the late leaf spot causing fungal pathogen Phaeoisariopsis personata when compared with the cultivated peanut, Arachis hypogaea. AdDjSKI is induced in multiple stress conditions in A. diogoi. Recombinant E. coli cells expressing AdDjSKI showed better growth kinetics when compared with vector control cells under salinity, osmotic, acidic and alkaline stress conditions. Overexpression of this type three J-protein potentiates not only abiotic stress tolerance in Nicotiana tabacum var. Samsun, but also enhances its disease resistance against the phytopathogenic fungi Phytophthora parasitica pv nicotianae and Sclerotinia sclerotiorum. In the present study we show transcriptional upregulation of APX, Mn-SOD and HSP70 under heat stress and increased transcripts of PR genes in response to fungal infection. This transmembrane-domain-containing J protein displays punctate localization in chloroplasts. AdDjSKI appears to ensure proper folding of proteins associated with the photosynthetic machinery under stress.
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