1,721,055 research outputs found
Pedotransfer functions and their impact on soil water dynamics simulation and yield prediction: A HERMES model case study
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
High-precision weighable lysimeter - a holistic tool for quantifying and tracking water fluxes at the land surface and in the soil
No full textHigh precision lysimeters improve our understanding of water cycle and solute transport dynamics
Get PDFWater is the most precious natural resource on earth. Understanding the movement of water and dissolved substances between the different compartments soil, vegetation, and atmosphere is of crucial importance to resolve various environmental issues. The issue comprises the protection of groundwater quantity and quality, the optimization of crop production and the efficient use of fertilizer and crop protection products in agriculture. Predictive modeling of water and solute transport can help to provide information for decision makers to manage, protect and sustain these available natural resources. Models are a simplification of complex natural processes and connect known fluxes at the model boundaries with state variables from the unsaturated zone (vadose zone). The calibration of such models requires precise knowledge about the boundary conditions and state variables to identify the properties of the vadose zone that link fluxes with state variables, such as soil water retention characteristic, unsaturated hydraulic conductivity, and solute dispersion coefficient. The aim of this study was to investigate how beneficial are high precision lysimeter data to quantify water cycle components and how useful are such information's to calibrate a vadose zone model and obtain the parameters, to track the movement of water through the soil. We used synthetic and real lysimeter data to investigate the following objectives: (1) influence of changing surrounding subsurface conditions (soil texture and groundwater table) on the measured matric potentials that are used to control the water fluxes across the bottom boundary of transferred lysimeters in a climate change impact assessment, (2) do water from non-rainfall events (dew, hoar frost) contribute substantial to the water budgets of grasslands, (3) is nighttime evapotranspiration an relevant process that impacts the total evapotranspiration, and (4) are highly accurate water cycle terms, soil water content, matric potential, and water stables isotope data obtained from lysimeters simultaneously necessary to estimate water flow and solute transport parameters of a layered soil. Our investigation indicates that water cycle components are highly sensitive onto changes in subsurface conditions (soil texture and groundwater table) and thus climate change impact studies need to account for it. Lysimeter observations uncovered that non-rainfall water and nighttime water losses from evapotranspiration were until now unseen but relevant processes for the water budgets of grassland ecosystem. The simultaneous use of an accurate information on the complete water cycle, soil water content, matric potential, and stables isotope data obtained from lysimeter data were necessary during inverse model calibration to identify parameters of layered soils for the soil water retention characteristic, unsaturated hydraulic conductivity, and solute dispersion coefficient. In this work, we propose that high precision lysimeter combined with internal sensors devices provide the required observations to quantify complex key processes that control the energy and mass exchanges between atmosphere and subsurface and thus improve our understanding of the complete water cycle and solute transport dynamics in the vadose zone
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
- …
