1,721,200 research outputs found
Computer systems recommendations for the MBA programme : research report.
No full textby Lau Sui-yin, Eddie, Chan Wan-kam.Bibliography: leaves 110-111Thesis (M.B.A.)--Chinese University of Hong Kong, 198
Comparative finite element analysis of stress distribution of different implant- supported crown and abutment materials / Chan Wan Wan
No full textThis study aimed to evaluate the stress distribution of three-dimensional (3D) printed ceramic filled hybrid materials and zirconia as abutments and implant-supported crowns using a finite element study model. Five groups of materials were: computer-aided design and computer-aided manufacturing (CAD/CAM) zirconia implant-supported crown with CAD/CAM zirconia custom abutment (ZR-ZR); 3D printed VarseoSmile® Crown Plus implant-supported crown with CAD/CAM zirconia custom abutment (VSC-ZR); CAD/CAM zirconia implant-supported crown with 3D printed VarseoSmile® Crown Plus custom abutment (ZR-VSC); 3D printed VarseoSmile® TriniQ® implant-supported crown with CAD/CAM zirconia custom abutment (VST-ZR); and CAD/CAM zirconia implant-supported crown with 3D printed VarseoSmile® TriniQ® (ZR-VST) custom abutment. The implant-supported crown of a mandibular first molar was designed and modelled in computer-aided design (CAD) software, and analysed using finite element analysis (FEA) ANSYS Workbench 2021 R1 software. All the materials were considered homogenous, isotropic, and linearly elastic. A 600N vertical load (Load Case 1) was applied to the central axis of implant onto the crown, while a 225N oblique load (Load Case 2) was applied 45° to the central axis of implant onto the crown. The von Mises stress was recorded at crown, cement between crown and CAD/CAM custom abutment, CAD/CAM custom abutment, cement between CAD/CAM custom abutment and titanium base (Ti-base) abutment, abutment screw, titanium base abutment, fixture, cortical, and cancellous bone. The von Mises stress percentage difference was compared to the control group ZR-ZR. The stress concentration areas were indicated by colorimetric map. At the crown, Group ZR-VST had the highest von Mises stress (214.39 MPa; 112.72 MPa), while Group VST-ZR had the lowest (173.66 MPa; 101.58 MPa) in Load Case 1 and 2, respectively. The stress concentration areas were the crown's occlusal area, the cement layer of the neck and top region of the abutment, top region of titanium base abutment, the internal connection to the abutment screw, the collar area at gingival level, first thread of abutment screw, and cervical area of titanium base abutment. At the CAD/CAM custom abutments, Groups ZR-VSC and ZR-VST demonstrated the lowest stress in Load Case 1 and 2, which were 46.66 MPa and 44.62 MPa; 45.34 MPa and 41.95 MPa, respectively. The cement between the crown and the CAD/CAM custom abutment showed the lowest stress in Group ZR-VSC (28.19 MPa) and Group ZR-VST (28.92 MPa) in Load Case 1. In Load Case 1, the cement between the CAD/CAM custom abutment and the Ti-base abutment demonstrated the greatest stress in Groups ZR-VSC (70.14 MPa) and ZR-VST (72.52 MPa), similarly observed in Load Case 2 (Group ZR-VSC:54.72 MPa; Group ZR-VST: 57.76 MPa). The stress at the fixture in the cortical and cancellous bones was comparable across all groups under both loads. In conclusion, the combination of implant-supported crown and abutment with different moduli of elasticity positively influences stress distribution at the crown, cement between crown and CAD/CAM custom abutment, CAD/CAM custom abutment, abutment screw, cement between CAD/CAM custom abutment and Ti-base abutment, Ti-base abutment and fixture, but no effect on stress distribution in the peri-implant bone structure
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
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
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