1,722,075 research outputs found
Le plan de la Somme théologique et le rapport «Ratio - Revelatio»
No full textPersson Per Erik. Le plan de la Somme théologique et le rapport «Ratio - Revelatio». In: Revue Philosophique de Louvain. Troisième série, tome 56, n°52, 1958. pp. 545-572
Seascapes of stability and change: the archaeological and ecological potential of the early mesolithic seascapes with examples from Haväng in SE Baltic, Sweden
No full textThe sea level low stand period during the Early Mesolithic in SE Baltic (c. 9,500-6,500 BC) has resulted in vast inundated areas. Some of the sites have yielded extensive remains of lagoonal and riverine sediments, as well as areas with trees preserved in situ. Investigations at one of the sites - Haväng in eastern Scania - have resulted in archaeological findings from the entire period. The preservation of organic materials are very good, and gives new insights in material culture and fishing technologies. Extensive surveying and hydro-acoustic mapping gives possibilities to draw some conclusion of the possible timing of the introduction of stationary fishing and how this relates to cultural and natural changes. The paper proposes that riverine stationary fisheries in the southern Baltic were introduced during the Boreal period (7000 BC or earlier). The Maglemose fisheries are proposed as indirect evidence of early seascape territorialisation, which must be understood in a cultural and ecological context
Understanding relations between variables : Revisiting a ‘node’ in the development of algebraic thinking
No full textTo what extent are students, beginning at upper secondary level, able to explain the algebraic statement y = x + 5, and which representational forms do they use? Results from parts of a larger longitudinal study in Sweden are presented and compared to two other, similar studies involving students from different educational levels. This article also discusses possible strategies to improve mathematics instruction, for enabling students to acquire a higher quality of algebraic thinking, including an earlier introduction of algebra in primary school and the use of technology for multiple representations
Transpulmonary driving pressure during mechanical ventilation–validation of a non‐invasive measurement method
No full textBackground Transpulmonary driving pressure plays an important role in today's understanding of ventilator induced lung injury. We have previously validated a novel non-invasive method based on stepwise increments of PEEP to assess transpulmonary driving pressure in anaesthetised patients with healthy lungs. The aim of this study was to validate the method in patients who were mechanically ventilated for different diagnoses requiring intensive care. Methods We measured transpulmonary pressure (Ptp) and calculated transpulmonary driving pressure (Delta Ptp) in 31 patients undergoing mechanical ventilation in an intensive care unit. Parallel triplicate measurements were performed with the PEEP step method (PtpPSM) and the conventional oesophageal balloon method (Ptpconv). Their agreement was compared using the intraclass correlation coefficient (ICC) and the Bland Altman plot. Result The coefficient of variation for the repeated measurements was 4,3 for Delta PtpPSM and 9,2 for Delta Ptpconv. The ICC of 0,864 and the Bland Altman plot indicate good agreement between the two methods. Conclusion The non-invasive method can be applied in mechanically ventilated patients to measure transpulmonary driving pressure with good repeatability and accuracy comparable to the traditional oesophageal balloon method
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
Fungal decomposition and transformation of molecular and colloidal fractions of dissolved organic matter extracted from boreal forest soil
No full textDissolved organic matter (DOM) plays a central role in soil carbon (C) dynamics, serving as both a substrate for microbial decomposers and a source of material stabilised via physical protection in molecular aggregates and associations with mineral particles. It is well established that soil microorganisms play a key role in mineral-associated C aggregates; however, their impacts on molecular aggregates is not clearly understood. Here, we examined the ability of an ectomycorrhizal fungus (Paxillus involutus) and a saprotrophic fungus (a strain of Gloeophyllum), two major functional groups of fungal decomposers in forest ecosystems, to decompose and process the molecular and colloidal size fractions of DOM. DOM was extracted by water from boreal forest soil, and the chemical composition and colloidal properties were followed over 11 days using nuclear magnetic resonance (NMR) spectroscopy and small-angle light and X-ray scattering techniques. Both fungi decompose various organic compounds into their molecular fractions in the presence of an energy source (i.e. glucose). The decomposition rate was significantly higher for Gloeophyllum than for P. involutus. When glucose was depleted, Gloeophyllum continued to decompose more complex carbohydrates, whereas the decomposition activity of P. involutus almost stopped. A large proportion of the C in the DOM was found in organic colloids. At later stages, Gloeophyllum but not P. involutus, significantly affected the colloids by promoting the formation of larger aggregates. Thus, saprotrophic fungi activity can significantly influence the colloidal properties of DOM. Our results support the view that ectomycorrhizal fungi decompose some of the soil organic C however, their overall capacity for DOM decomposition and transformation is significantly lower than that of saprotrophic fungi
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
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