1,720,952 research outputs found
The penetration of sea water into the Dutch river mouths and estuaries
No full textcontains an overview of the state of art of salt penetration knowledge in 1953, presented at the PIANC conference. This Dutch contribution contains three parts: The penetration of sea water into the Dutch river mouths and estuaries( van Veen), Theories on which a method of calculation for the movement of salt water and fresh water in a river is based in case of tidal current (Dronkers), The penetration of sea water into inland water situated beyond shipping locks (Noteboom & Schönfeld
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
Development of an Analytical Method to determine Cavity Pressure in Cold-Bent Insulating Glass Units
No full textCold-bent insulating glass units (IGU) have the potential to be one of the answers to current needs and wishes of modern and sustainable architecture. Curved glass is stiffer against out-of-plane loads and therefore the structural behaviour of cold-bent IGU’s is different compared to flat IGU’s. Structural behaviour of flat glass in buildings is assessed using standards such as EN 16612 and NEN 2608. Within these norms, isochoric and load sharing cavity pressures are assessed using simplified analytical equations. In case of cold-bent IGU’s, the additional assessment of increased stiffness, permanent cold-bending stresses and optical distortions are of importance. Currently, no standards are available for building envelopes containing curved glass elements. Methods from current standards have proved to be sufficient to quantify the complex role of cavity pressure in flat IGU’s. The goal of this research is to develop an analytical method to determine the effect of cavity pressure on the structural behaviour of cold-bent insulating glass units. For the structural assessment of cold-bent IGU’s three stages are defined: ’Bending phase’, ‘Fixation moment’ and ‘Use phase’. Numerical models are developed to gain insights into the structural behaviour of cold-bent glass plates. Insights are then used to derive and validate simplified analytical methods. The bending phase is numerically modelled with a geometrically nonlinear analysis in which curvatures are realized by prescribed displacements along two opposite edges of the plate. Results show that maximum cold-bending stresses are independent of plate size. By defining a tensile bending strength, insights are gained into the maximum radius of curvature of a plate with a specified thickness. A closed form equation is derived, which is used to calculate cold-bending stresses considering plate thickness and radius of curvature as input parameters. Resulting principal stresses have an average accuracy of 99.1% compared to numerical outcomes. Validity of the cold-bending stresses is limited to linearly fixed plates, up to a size of 6x3m, with equivalent plate thicknesses ranging from 4-20mm and design radii ranging from 3m to 25m.Numerical results from the fixation moment show an anticlastic double or triple (w-shape) curvature in single curved plates, that cause optical distortions. The extent and shape of anticlastic bending depend on the Poisson’s ratio, plate thickness, radius of curvature and plate size. Based on regression between the parameters of influence, a result-based approach is developed to determine anticlastic bending displacements at the centre of curved plates. The approach is simplified to a curved plate with a sinusoidal anticlastic bending curvature. The displacements are expressed in a parameter for the radius at midspan and are calculated using tabulated coefficients with an average accuracy of 99.3%. Validity of the radius at midspan is limited to the previously mentioned boundary conditions. For the use phase, the calculation of cavity pressures depends on the volume of deformation per pane of a linearly supported cold-bent IGU. Interaction between the panes is modelled using pressure loads derived from Boyle’s law. Using numerical models, volumes of deformation (v) from curved plates subjected to pressure loads (p) are presented in P-V diagrams. These diagrams are used calculate cavity pressures ranging from -1 to 1 kN/m2, considering plate sizes up to 6x3m, plate thickness of 8, 10 and 12mm and design radii up to 8m. Due to the increased stiffness of curved IGU’s, a higher load is shared by the pane onto which an external pressure is applied. Furthermore, as a result of anticlastic bending, a permanent isochoric pressure is present inside cavities of asymmetric IGU’s, which increases as curvatures increase. A simplified analytical method to calculate effective cavity pressures is derived from shell theory. Load sharing pressures of symmetric IGU’s are calculated with an average accuracy of 95%, compared to results from the numerical P-V diagrams. Load sharing pressures of asymmetric IGU’s (91% accuracy) are summed with isochoric pressures due to cold-bending (92% accuracy) to calculate combined effective pressures with an average accuracy of 87%. The equations are summarized in a guideline, which is complemented by an interactive calculation tool. The developed analytical method is effective in calculating effective cavity pressures and can be used to quickly explore various design options in a wide range of cold-bent IGU’s. Civil Engineering | Building Engineering - Structural Desig
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
