1,721,386 research outputs found
Analyzing the effects of particle-size distribution changes associated with carbonates on the predicted soil-water retention curve
No full textMargine, the olive mills waste water as an organic amendment for controlling wind erosion in southern Tunisia by improving the soil surface structure
No full textImpact of reduced tillage on soil erosion and soil physical quality in Belgium and Northern France
No full textInfluence of Acacia canopy cover on soil hydraulic properties in an arid zone of Tunisia
Full text linkMechanistic models for rhizolith formation and their implications for paleoenvironmental reconstructions
No full textAbstract Rhizoliths, cylindrical concretions formed primarily by CaCO 3 accumulation around plant roots, serve as valuable indicators of past environmental conditions, including hydrology, redox dynamics, and carbon cycling. Despite growing interest in paleo-reconstructions, the lack of quantitative studies on formation mechanisms complicates interpretation. We present “RhizoCalc”, the first mechanistic model (deployed in HYDRUS-1D) computing rhizolith formation in CaCO 3 -containing loess soils, integrating water fluxes, root water uptake, and (Ca)-carbonate chemistry to simulate conditions under which rhizoliths develop. Hydraulic fluxes drive Ca 2+ transport (0.13–1 mmol/L) toward the rhizosphere, governed by root water uptake under low (ET o = 0.03 cm/d) and high (ET o = 1 cm/d) flow rates at optimal (h o = –100 cm) and intermediate (h o = –1000 cm) moisture conditions. The simulations show that hydraulic constraints and calcite-induced jamming of the porous medium are key inhibitors of rhizolith growth, distinguishing physical limitations from biogeochemical feedbacks in the rhizosphere. On top of this, our work reveals root encasement and reliquary varieties, linking their physical and biogeochemical mechanisms to rhizolith transformations and offering insights into paleosol hydrology and redox dynamics. Under intermediate soil-water conditions with 1 mmol/L Ca 2+ , concentric rhizoliths with 0.2–3 cm radii form chrono-sequentially over 1.5–150 years. Each layer preserves CaCO 3 constituents (δ 18 O, δ 13 C, 44 Ca, 46 Ca, 48 Ca), root-derived biomarkers (e.g., lignin), and clumped isotopes (Δ 47 ), preserving environmental signatures across time into the future. Therefore, this framework conceptualizes each rhizolith as a ‘time-capsule’ with each successive CaCO 3 layer encapsulating a snapshot of vital environmental proxies, providing a window into otherwise inaccessible historic ecosystem dynamics. Refining reconstructions of Earth’s paleoclimatic history requires cross-sectional isolation of concentric layers in well-preserved rhizoliths, capturing distinct isotopic bands and their stratigraphy
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
sj-docx-1-jht-10.1177_10963480221080331 – Supplemental material for Conceptualizing the dark ride experience through the Dark Ride Cube: Evidence from the Emea region
No full textSupplemental material, sj-docx-1-jht-10.1177_10963480221080331 for Conceptualizing the dark ride experience through the Dark Ride Cube: Evidence from the Emea region by Pieter C. M. Cornelis, Wim Strijbosch and Philip Corsius in Journal of Hospitality & Tourism Research</p
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