1,720,968 research outputs found
Boshof (E.) - Düwell (K.) - Kloft (H.), Grundlagen des Studiums der Geschichte. Eine Einführung,
No full textPacquet Jacques. Boshof (E.) - Düwell (K.) - Kloft (H.), Grundlagen des Studiums der Geschichte. Eine Einführung, . In: Revue belge de philologie et d'histoire, tome 54, fasc. 2, 1976. Histoire (depuis l'Antiquité) — Geschiedenis (sedert de Oudheid) pp. 691-692
Boshof (E.) - Düwell (K.) - Kloft (H.), Grundlagen des Studiums der Geschichte. Eine Einführung,
No full textPacquet Jacques. Boshof (E.) - Düwell (K.) - Kloft (H.), Grundlagen des Studiums der Geschichte. Eine Einführung, . In: Revue belge de philologie et d'histoire, tome 54, fasc. 2, 1976. Histoire (depuis l'Antiquité) — Geschiedenis (sedert de Oudheid) pp. 691-692
Branching Structure for Reinforcement Anchorage Produced with Wire and Arc Additive Manufacturing Technique
No full textLimitations concerning the reinforcement for additively manufactured reinforced concrete structural elements are many. From integration strategies to material waste, reinforcement needs to be redefined in order for complete automation to occur. Recently the prospect of wire-and-arc additively manufactured (WAAM) steel reinforcement was introduced, as a potential alternative to the conventional reinforcement mesh and that so, in the form of bars, planar or spatial diagrids. Though the linear form of the reinforcement is often most effective in the undisturbed regions, disturbed regions, such as the anchorage zone benefit more from the reinforcement of different geometrical designs. Combining the theoretical geometrical freedom, together with the spatially unconfined workspace of WAAM, branched geometry for the anchorage zone reinforcement is devised. Design is based on the behaviour of the principal isocurves in the anchorage zone, with the intention of transferring the load to the concrete matrix in a dissipative manner. Material data on steel WAAM is used from previous studies and integrated into the finite element simulations. Motivation for the selection of this particular AM method is found, among all, in the WAAM’s inherent characteristic surface roughness that could beneficially affect the performance of so manufactured reinforcement anchorage. The benefits of a nature-inspired, root-like design are also discussed, and future directions are proposed
Blended structural optimization of steel joints for Wire-and-Arc Additive Manufacturing
Full text linkMetal Additive Manufacturing, and in particular Wire-and-Arc Additive Manufacturing (WAAM) has proved to be a great and efficient alternative to the common subtractive manufacturing processes to realize complex-shape members and connections for construction. With reference to complex spatial structures such as gridshells, the connections play a crucial role both in the design and the construction processes. Novel computational design tools allow designers to conceive optimized joint solutions while minimizing the material use, resulting in difficult geometries to be fabricated with conventional methods. The present work aims at providing an innovative integrated design and fabrication framework to efficiently apply topology optimization algorithms to improve the efficiency of steel joints in complex spatial structures. The framework is based on the so-called “blended” structural optimization approach aimed at incorporating manufacturing constraints, basic principles of conceptual structural design and structural requirements into topology optimization to design ready-to-fabricate complex steel joints. The designs are suitable for fabrication with the WAAM process. The approach is applied to a case study to re-design the joint connections of the world's renowned British Museum gridshell rooftop structure. From a catalogue of various designs for each unique joint, one selected design is optimized and then checked for structural requirements in terms of strengths and stiffness. Then the optimized joint is validated for fabrication with WAAM process
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
Combined Additive Manufacturing Techniques for Adaptive Coastline Protection Structures
Full text linkTraditional reinforcement cages are manufactured in a handicraft manner and do not use the full potential of the material, nor can they map from optimised geometries. The shown research is focused on robotically-manufactured, structurally-optimised reinforcement structures which are prefabricated and can be encased by concrete through SC3DP in a combined process. Based on the reinforcement concept of “reinforcement supports concrete,” the prefabricated cages support the concrete during application in a combined AM process. To demonstrate the huge potential of combined AM processes based on the SC3DP and WAAM techniques (for example, the manufacturing of individualized CPS), the so-called FLOWall is presented here. First, the form-finding process for the FLOWall concept based on fluid dynamic simulation is explained. For this, a three-step strategy is presented, which consists of (i) the 3D modelling of the element, (ii) the force-flow analysis, and (iii) the structural validation in a computational fluid dynamics software. From the finalized design, the printing phase is divided into two steps, one for the WAAM reinforcement and one for the SC3DP wall. The final result provides a good example of efficient integration of two different printing techniques to create a new generation of freeform coastline protection structures
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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