186,507 research outputs found
Multiphysics Modeling of Induction Hardening of Ring Gears for the Aerospace Industry
No full textInduction heating has been widely used for heat treating and especially surface hardening in a broad variety of applications, ranging from the automotive to the renewable energy market. However, the lack of precise knowledge about the interrelation between all the concurrent physical phenomena occurring within the part during the heating cycle has restricted its use to mass-production items (mostly gears). The benefits of this technology, which is clean, repeatable, and cost-effective, could boost its introduction into more conservative industry sectors, such as aerospace, where furnace-based treatments (e. g., carburizing) represent the golden standard. The major limitation is related to the optimization of the induction hardening process, which usually requires significant material know-how and can thus be very long and expensive. Computer simulation could provide a general tool for understanding and improving the critical aspects of each step of the process, thus speeding up the spreading of the induction technology into new markets
Compte rendu de l'ouvrage de P. PAKKANEN & S. BOCHER : Cult Material. From Archaeological Deposits to Interpretation of Early Greek Religion
Get PDFpeer reviewedCompte rendu de l'ouvrage PAKKANEN Petra, BOCHER Susanne (éd.), Cult Material. From Archaeological Deposits to Interpretation of Early Greek Religion, Helsinki, 2015
Measurements and prediction of extreme defect distributions for fatigue assessment in multi-pass weld of 13%Cr–4%Ni alloy for hydraulic turbines
No full textFlux cored arc welding (FCAW) is a manufacturing process commonly used for hydro-turbine application, especially in the assembly of Francis runners made of 13%Cr–4%Ni stainless steel. The welded connection between the blade and band/crown is particularly susceptible to high stress levels due to the design of the runner and the presence of welding defects which act as localized stress concentrations. This research aims to predict the effect of these defects on the performance of the runner during operating condition. To investigate the occurrence of the defects, the distributions of the observed discontinuity are measured and analyzed on T-shape joint specimens using metallographic and X-ray 2D images. The data obtained from these two methods of acquisition are compared to identify any discrepancy. Extreme Value Statistic (EVS) is used to estimate the likely occurrence of the largest defects within the welded runner zone. Based on these findings, a probabilistic Kitagawa–Takahashi diagram with the El-Haddad approximation is adopted to quantify the influence of the defects size in the fatigue assessment
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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
lczexplore : an R package to compare different local climate zone classifications on same geographical areas
No full text<p>The goal of lczexplore is to explore and compare Local Climate Zone classifications of urban areas. </p><p>Climate change is a growing concern for city planners with a special focus on Urban Heat Island phenomenons. <br>Stewardt and Oke have proposed a classification of Local Climate Zones (LCZ) that describe rural and urban areas, with 10 built types and 7 land cover types. </p><p>Several approaches classify land units into LCZ and may produce different results. <br>For instance, the GeoClimate geospatial toolbox use GIS layers from OpenStreetMap or the french BD Topo <br>whereas the WUDAPT platform uses remotely sensed information and local expert knowledge. </p><p>The lczexplore packages allows to easily : <br>- load these classification from GIS layers<br>- produce maps of these LCZ classification<br>- compare these classifications</p><p>This new version includes improvements made by JOSS reviewers</p>
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
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