1,720,956 research outputs found
Computer Aided Development and Performance Evaluation of a Helical Triple Tube Ultra-High-Temperature (UHt) Milk Sterilizer
No full textDesign and development of a concentric driven serial chain manipulator
Get PDFNow-a-days, industrial robot is been custom made by various companies which serves companies of different sectors in fulfilling the very specific demand, such as welding, painting, fabricating microchips, etc. Usually these robots are provided with actuators at each joint for simplicity and reliability. This paper introduces a new concept of a concentric driven serial chain manipulator where only one motor is used to supply the power required by the robot to do all the required motion or it’s a uni-motor robot or manipulator.
The sole idea is to power the manipulator by a single servo motor, which will enable motion to each joint, but one at a time. An auto clutch system is designed, so that the requirement of additional costly electromagnetic clutches is totally eliminated. Such a design configuration of the manipulator has an obvious advantage on design reliability, cost saving and easy maintenance. This project includes a new mechanical drive to achieve the required power transmission and subsequently new locking design for the joints. The manipulator is modeled and simulated over CATIA V5 R21 software to test the kinematics of the manipulator components
Modeling and Optimization of a Network of Evacuated Solar Collectors Attached to an Absorption Refrigeration System
No full textThe vapor absorption refrigeration system is an alternative cooling technology to vapor compression that can operate with low-grade energy sources, such as solar thermal energy. This study provides an analytical model, developed using heat and mass transfer equations in Microsoft EXCEL, to estimate the fluid outlet temperature of the collector (water), and thermal efficiency of the evacuated solar collectors as a function of inlet water temperature, solar intensity, and flow rate. To evaluate the optimum operating values to obtain the target hot water temperature required for operating the absorption system, a three-level Box-Behnken design matrix was generated using Design Expert-10 software selecting an appropriate input range, i.e., flowrate: 3 to12 L min-1, inlet water temperature: 25°C to 35°C, and solar intensity: 550 to1150 W m-2. Performance values (response) were evaluated using the developed thermal model, and values obtained were inserted for each generated input combination in the design matrix followed by an analysis of variance (ANOVA) and regression analysis. Equations were generated to predict responses after testing the significance of the response surface quadratic model. Results showed an increase in the collector fluid outlet temperature with a lower flow rate of collector fluid, higher ambient temperature and solar intensity. Optimization showed the optimal range of collector fluid outlet temperature between 83°C and 90°C and thermal efficiency of 37.45% to 39%. This study can lead to the development of more efficient system design including solar collectors by maximizing the utilization of solar energy
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
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