1,721,008 research outputs found
Numerical Investigation of the Sliding Contact of Tire Rubber Material Due to a Blade Sliding Indentation
Full text linkThe manufacturing technology of tire rubber material to improve its performance is still developing. Mechanical and tribological properties are considered in the rubber manufacturing. One of the important tribological properties is the braking capacity of the tire which is strongly associated with sliding contact. However, theoretical as well as experimental methods are still difficult to be applied to analyse these properties due to the unique behaviour of rubber material. This study proposes a numerical investigation of the sliding contact of rubber material due to a rigid blade sliding indentation using Finite Element Analysis (FEA). In this FE simulation, the rubber material is modelled as a hyper-elastic material with Money-Rivlin type for Strain Energy Function (SEF). There are three types of rubber material analysed, the first and second type are commonly used in vehicle tires i.e. vulcanized rubber 1 (R1) and vulcanized rubber 2 (R2), while the third type is a new product in the form of Solution Styrene Butadiene Rubber (S-SBR). Sliding indentation is carried out at a specified sliding speed with several depths and contact surface roughness. The simulation results shown are in the form of the rubber surface deformation, friction forces, and stress distribution. In general, the simulation results show that the S-SBR has a slightly higher coefficient of friction (COF) than the other types.</p
Improving the Performance of Photovoltaic Panels by Using Aluminum Heat Sink
No full textSolar photovoltaic (PV) system has drawn the tremendous attention of researchers and governments in the past recent years. However, operating temperature of PV has major role to its efficiency and lifetime. This paper reported an experiment of aluminum heat sink as a cooling device to reduce the operating temperature and to improve the performance of PV panels. The performance of PV panels with and without aluminum heat sink were compared. Result showed that solid heat sink increased the average power output by 3.14 W and efficiency by 1.61%. Modification by perforating the fins increased the average output power by 1.79 W and efficiency by 0.60% compared to the solid heat sink. This cooling method was an effective and potential to be applied on commercial PV panels
A novel magnetorheological valve with meandering flow path structure
Full text linkThe development of a new Magnetorheological (MR) valve with meandering flow path as a new approach to improve the MR valve performance is presented in this research. The meandering flow path was formed by the arrangement of multiple annular and radial channel so that the total effective area in an MR valve can be increased without compromising the size and power requirement of the valve. The main objective of this research is to explore the achievable pressure drop of the MR valve with meandering flow path. This research was started with the concept development where the meandering flow path structure is analytically modeled and numerically simulated to predict and analyze the effect of variables involved. The prediction results showed that the meandering flow path structure is able to increase the achievable pressure drop of an MR valve significantly. The gap size analysis showed that the size of annular gaps mainly contributed to determine the viscous pressure drop component. Meanwhile, the field-dependent pressure drops were mainly determined by the size of radial gaps. The prediction results of the concept was also assessed and confirmed by the experimental work using a dynamic test machine. Based on the experimental data, two hysteresis models, namely the polynomial model and the modified LuGre model, were developed to model the hysteresis behavior. The assessment results of the hysteresis models indicated that both model were able to replicate the hysteresis behavior. However, the modified LuGre model, though 9.5% less accurate than the polynomial model, was showing better consistency in a wider range of input values. In general, the new concept contributes in the development of a new type of MR valve that could achieve pressure drop nearly three times than the annular, radial and annular-radial type MR valve
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
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