1,720,988 research outputs found
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
Framework for Ecotoxicological Risk Assessment of Ionic Liquids
No full textAbstractAlthough ionic liquids (ILs) hold salient features and considered as a replacement of conventional organic solvents, but their possible toxicological and ecotoxicological impacts must be considered equally in the design and development stage. Predicted no-effect concentration (PNEC) plays a vital role in assessing the ecotoxicological hazards in the ILs. A systematic methodological framework is presented for assessing the predicted environmental concentration (PEC) of ionic liquids. Initially, an effect level is predicted with a general quantitative structure–activity relationship (QSAR). Secondly, predicted no-effect concentration (PNEC) is calculated by using assessment factor (AF). The PEC is compared to the PNEC to characterize the risk for the freshwater aquatic organisms. If the ratio continued to exceed one, ionic liquids under investigation will need further aquatic risk assessment procedures, which involve iterative steps to refine the PEC and PNEC
Numerical Simulation for Dehydration of Natural Gas using Joule Thompson Cooling Effect
No full textAbstractIn this study, the potential of Joule Thompson cooling effect for natural gas dehydration was studied using numerical simulation method. Population balance model (PBM) was used to simulate the non-equilibrium water condensation process. Meanwhile, empirical nucleation model and diffusion growth model were taken under consideration in order to predict the onset of the water nucleation and the non-equilibrium mass transfer rate. The simulation condition was set at 78% of CO2content,feed pressure of 71bar and temperature of 300K. The Joule Thompson effect has been validated with the experimental data. The non-equilibrium results were then compared with the equilibrium results in order to investigate the pressure drop required for the water nucleation. Results showed that,alarge homogeneous nucleation of water occurred at the pressure drop larger than 30bar. This has resulted in an extremely high condensation rate for the vapor in the natural gas under high pressure drop. Hence, the transition of non-equilibrium to equilibrium can be achieved within 5 milliseconds condensation time, indicating the possibility of Joule Thompson cooling effect in high efficient natural gas dehydration
Effect of Glass Transition Temperature in Enhanced Polymeric Blend Membranes
No full textAbstractThe Enhanced Polymeric Blend Membranes (EPBM) have an exceptionally promising future in the gas separation industry due to improved physical and chemical properties compared to organic and inorganic membranes. In this research two reference membranes comprising PSU glassy and PVAc rubbery polymers were used as controls for comparative analysis. The research is focused on the preparation of flat sheet PSU/ PVAc polymeric blend membranes. The composition of PVAc contents varied between 5-20 wt% in the PSU matrix. Differential scanning calorimetry (DSC) analysis showed the existence of single glass transition temperature (Tg) for different membrane blends which indicated miscibility among the PSU/PVAc polymer blends. The glass transition temperature (Tg) miscibility among the polymeric blends were further judged by using Fox equation (series model) or Wood's equation (parallel model) or Pochan's equation (logarithmic model)
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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