1,721,014 research outputs found
Analilis Numerik Terhadap Konsentrasi Tegangan Pada Poros Transmisi Kendaraan Berat Denagn Variasi Laju Pembebanan
Full text linkPenelitian ini bertujuan untuk menganalisa konsentrasi tegangan terhadap 3 poros transmisi dengan menggunakan software ansys. Pengujian terhadap poros digunakan penggujian statis dan dinamis, pengujian statis dan dinamis ini bertujuan untuk mengetahui total deformation, tegangan equivalen stress dan maximum principal elastic strain. Perbedaan poros 1 poros 2 dan poros 3 yaitu panjang poros dan jumlah splain terhadap poros, panjang poros 1 yaitu 545 mm, panjang poros 2 yaitu 542 mm, pnjang poros 3 yaitu 539 mm, jumlah splain terhadap poros 1 yaitu 3 splain, poros 2 berjumlah 4 spalin, poros 3 berjumlah 5 splain. Dilihat dari hasil analisis terhadap statik struktural, bahwa terdapat tegangan maksimum diantara total deformation, equivalen stress, dan equivalen elastic strain pada poros 1,2 dan 3 adalah: Pada total deformation kekutan maksimal terletak pada poros 1, Pada equivalen stress kekuatan maksimal terletak pada poros 1, Equivalen elastic strain kekuatan maksimal terletak pada poros 1. Pada saat transient (dinamis) dilakukan penyetingan waktu yaitu number of stepnya 1, current step number 1, step end timenya 1 s, initial substepsnya 10, minimum substepsnya 10, maximum substepsnya 10. Jadi dilihat dari hasil total deformation, equivalen stress, equivalen strain pada poros 1,2 dan 3 adalah:Pada total deformation kekutan maksimal terletak pada poros 1, Pada equivalen stress kekuatan maksimal terletak pada poros 3, Pada equivalen elastic strain kekuatan maksimal terletak pada poros 3. Jadi perbedaan antara statik struktural dan transien struktural hanya membedakan waktu, kalau statik struktural tidak menggunakan waktu sedangkan transient struktural menggunakan waktu
CFD Analysis of Hydrodynamic Loads on Jack-Up Platforms Using Buoyancy-Modified k-ω SST Turbulence Model
No full textThe offshore jack-up production platform operates in extreme and unpredictable marine environments. Therefore, its structural strength must be designed to withstand harsh conditions, particularly hydrodynamic loads from waves and ocean currents. This study aims to numerically analyze the interaction of marine hydrodynamic forces with a jack-up production platform using OpenFOAM v1606, a Computational Fluid Dynamics (CFD) software. Specifically, the research evaluates a buoyancy-modified k−ω SST turbulence model based on the Standard Gradient Diffusion Hypothesis (SGDH) on a 3D jack-up platform model. The analysis is conducted using a Stokes 5th-order wave model within the waves2Foam toolbox, considering four variations in wave height and period. The results demonstrate that the modified turbulence model provides more accurate predictions. Additionally, they reveal that the forces acting on the platform’s walls are directly proportional to wave height and period, with the highest recorded load reaching 4000 N in Case A, where the wave height and period are 5.4 m and 5.9 s, respectively. Furthermore, it is observed that most of the forces exerted on the platform hull are vertical, primarily due to the negative pressure on the platform’s bottom side
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
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
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
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