1,721,069 research outputs found
Barriers To Mentorship For Academic Returnees: Experiences From Pakistan Higher Education
Full text linkMentoring of faculty is one important aspect in higher education especially for countries investing in training faculty abroad. The study explores the key challenges that young faculty are facing and the expectations following return from doctoral studies abroad. The participants of this study were doctoral graduates who completed studies in UK and USA and working in the Higher Education Commission of Pakistan. A grounded theory approach was used in the theoretical development of the categories of participant perspectives concerning their constraints and expectations. Using both primary data and secondary data from in-depth interviews, participant experiences were explored and analysed. The findings reveal challenges faced by young academics returning to Pakistan. Some of the difficulties are emerging due to the infant higher education system characterised by the lack of a research culture and at a time when academic roles are experiencing change. Remedial mechanisms in form of further mentoring by foreign faculty, installation of research infrastructure and restructuring of existing systems are needed to strengthen research in Pakistan higher education system
Analysis of an Airfoil with Rotating Cylinder for Improved Performance
No full textA Master of Science thesis in Mechanical Engineering by Anfal Al-Abdullah entitled, “Analysis of an Airfoil with Rotating Cylinder for Improved Performance”, submitted in April 2019. Thesis advisor is Dr. Mohammad Omar Hamdan and thesis co-advisor Dr. Muhammad Imran Qureshi. Soft and hard copy available.Among the multiple techniques used for boundary-layer control and flow separation delay, moving surface boundary-layer control is one of the promising approaches. Adding a rotating cylinder is one means of enhancing the aerodynamic performance of an airfoil, given that it serves to be an effective way in delaying stall. In this study, a rotating cylinder has been embedded in the leading edge of a NACA0024 airfoil. The wing model has been analyzed experimentally as well as numerically. The airfoil has been tested experimentally in a subsonic wind tunnel under different angles of attack, , and cylinder-to-freestream velocity ratios, . The effect of both parameters on the aerodynamic performance has been investigated, mainly through calculation of the lift coefficient, , the drag coefficient, , lift-to-drag ratio, /, and stall angle of attack, . Additionally, flow visualization has been carried out to get a perspective on the behavior of the rotating cylinder. Multiple photos have been captured where the streamlines of the flow are clear to the eye. A 2D numerical simulation using Computational Fluid Dynamics (CFD) has been carried out using ANSYS FLUENT 17.0 software. Through replicating the exact conditions of the experimental work, the CFD simulation has been successfully validated by its experimental counterpart. Results have shown a promising increase in the maximum lift coefficient from 0.98 at = 0 to 1.45 at = 6, which translates to around a 48% increase. The corresponding stall angle of attack has increased simultaneously from =15° at = 0, to around =35° at = 6. This increase of lift, however, is accompanied by a 47% increase in maximum drag coefficient. Furthermore, varying the cylinder exposure between 20% and 40% has shown an increase of 6.6% to 19.6% in the lift coefficient at = 10° and 20°, respectively.College of EngineeringDepartment of Mechanical EngineeringMaster of Science in Mechanical Engineering (MSME
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
Families of polarised varieties in weighted flag varieties
No full textWe construct families of polarised projective varieties as quasilinear sections of weighted flag varieties in codimensions 6,7,8,9 and 10. Our tools include a general formula for the Hilbert series of weighted flag varieties, an algorithm to compute their defining equations under their Plücker-style embeddings, and detailed computer-assisted searches. We study complete intersections in a weighted flag variety of the Lie group of type G2, the weighted Grassmannian wGr(2,6), the weighted Lagrangian Grassman- nian wLGr(3,6), a partial weighted flag variety of type A3 and finally a weighted flag variety of the exceptional Lie group of type F4. We construct many families of canon- ical Calabi-Yau 3-folds, log-terminal Q-Fano 3-folds and canonical 3-folds with cyclic quotient singularities.EThOS - Electronic Theses Online ServiceGBUnited Kingdo
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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