1,721,677 research outputs found
SiSPAT-Isotope code for modelling stable water isotopologue transport within soils
No full textSiSPAT-Isotope source code to reproduce the results presented in J. Schneider, S. Kiemle, K. Heck, Y. Rothfuss, I. Braud, R. Helmig, J. Vanderborght (2024) Analysis of experimental and simulation data of evaporation-driven isotopic fractionation in unsaturated porous media. Vadose Zone Journal, e20363.
SiSPAT is a one-dimensional numerical model of water and energy fluxes in the soil-plant-atmosphere continuum. The extension SiSPAT-Isotope allows to sequentially solve the transport of stable water isotopologues and their fractionation behaviour in soils. The source code is stored in the files Sispat_isotope_it.f and Subrsispat_isotope_it.f.
With gfortran Sispat_isotope_it.f the program is executed. The file nomfich.dat contains all input and output files used in the simulation and is read into Sispat_isotope_it.f.</p
The impact of evaporation fractionation on the inverse estimation of soil hydraulic and isotope transport parameters
Full text linkChoosing a suitable process-oriented eco-hydrological model is essential for obtaining reliable simulations of
hydrological processes. Determining soil hydraulic and solute transport parameters is another fundamental
prerequisite. Research discussing the impact of considering evaporation fractionation on parameter estimation
and practical applications of isotope transport models is limited. In this study, we analyzed parameter estimation
results for two datasets for humid and arid conditions using the isotope transport model in HYDRUS-1D, in which
we either did or did not consider fractionation. The global sensitivity analysis using the Morris and Sobol ’
methods and the parameter estimation using the Particle Swarm Optimization algorithm highlight the significant
impact of considering evaporation fractionation on inverse modeling. The Kling-Gupta efficiency (KGE) index for
isotope data can increase by 0.09 and 1.49 for the humid and arid datasets, respectively, when selecting suitable
fractionation scenarios. Differences in estimated parameters propagate into the results of two practical appli-
cations of stable isotope tracing: i) the assessment of root water uptake (RWU) and drainage travel times (i.e., the
time elapsed between water entering the soil profile as precipitation and leaving it as transpiration or drainage)
in the lysimeter (humid conditions) and ii) evaporation estimation in a controlled experimental soil column (arid
conditions). The peak displacement method with optimized longitudinal dispersivity provides much lower travel
times than those obtained using the particle tracking algorithm in HYDRUS-1D. Considering evaporation frac-
tionation using the Craig-Gordon (CG) and Gonfiantini models is likely to result in estimates of older water ages
for RWU than the no fractionation scenario. The isotope mass balance method that uses the isotopic composition
profile simulated by HYDRUS-1D while considering fractionation using the CG and Gonfiantini models, or the
measured evaporation isotope flux, provides comparable results in evaporation estimation as the HYDRUS-1D
water mass balance method and direct laboratory measurements. In contrast, the no fractionation scenario
reasonably estimates evaporation only when using the HYDRUS-1D water mass balance method. The direct use
of simulated isotopic compositions in the no fractionation scenario may result in large biases in practical ap-
plications in the arid zone where evaporation fractionation is more extensive than in humid areas
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Le thésaurus Theia/OZCAR : un service terminologique pour faciliter la découverte, l’interopérabilité et la réutilisation des données du système d’information sur les surfaces continentales
No full textInternational audienceLe système d'information Theia/OZCAR a pour objectif de Faciliter la découverte, de rendre Accessible, Interopérable et Réutilisable (FAIR), les données in-situ des surfaces continentales collectés par les organismes de recherche Français et leurs partenaires étrangers (1). Les observatoires qui produisent les données présentent des pratiques de description des données hétérogènes et des noms de variables qui peuvent être différents pour la même variable (i.e. : « soil moisture », « soil water content », « humidité des sols », etc.). Il n'est pas possible de déduire simplement les similarités entre des variables mesurées par différents observatoires. Afin d'identifier ces similarités et d'implémenter dans le système d’information des fonctionnalités de découverte des données sur ces dimensions, le thésaurus de variable Theia/OZCAR (2) a été créé. Pour permettre l’interopérabilité technique du thésaurus, celui-ci est publié sur le web à l'aide du standard de description de vocabulaire SKOS (3). D'autres thésaurus utilisés en sciences de l'environnement en Europe et dans le monde ont été identifiés et la définition de relations associatives avec ces vocabulaires garantit l'interopérabilité sémantique du thésaurus Theia/OZCAR. Cependant, il est assez commun que les noms de variables utilisés pour les dimensions de recherches restent généralistes (i.e. « soil moisture ») et ne soient pas assez spécifiques pour que l'utilisateur final interprète exactement ce qui a été mesuré (i.e. « soil moisture at 10 cm depth measured by TDR probe »). C'est pourquoi, pour améliorer la réutilisation et l’interopérabilité des données, le thésaurus suit maintenant une recommandation de la Research Data Alliance et implémente le framework I-ADOPT (4) pour décrire plus précisément les variables. Chaque variable est composée et décrite par des relations avec des concepts atomiques dont la définition est précisée. (1) Braud, Isabelle, et al. "Building the information system of the French Critical Zone Observatories network: Theia/OZCAR-IS." Hydrological Sciences Journal (2020): 1-19. 10.1080/02626667.2020.1764568(2) Thésaurus Theia/OZCAR: https://w3id.org/ozcar-theia(3) Miles, Alistair, and Sean Bechhofer. ”SKOS simple knowledge organization system reference.” W3C recommendation (2009).(4) Magagna, Barbara, Moncoiffé, Gwenaëlle, Devaraju, Anusuriya, Stoica, Maria, Schindler, Sirko, Pamment, Alison, & RDA I-ADOPT WG. (2022). InteroperAble Descriptions of Observable Property Terminologies (I-ADOPT) WG Outputs and Recommendations (1.1.0). https://doi.org/10.15497/RDA0007
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