1,720,982 research outputs found
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
Evaluation Of Different Cogeneration Systems In First And Second Generation Ethanol Production From Sugarcane
No full textIn addition to being used as fuels in bioethanol production generating steam and electricity, sugarcane bagasse and trash may be used as feedstock for second generation ethanol production. The amount of surplus lignocellulosic material used as feedstock depends on the energy consumption of the production process. In this work simulations of the integrated first and second generation ethanol production processes from sugarcane were carried out using Aspen Plus, comparing different configurations of the cogeneration systems. Economic and environmental analyses were carried out, for comparison of different configurations. It is shown that surplus electricity sell can benefit second generation ethanol. © 2012 Elsevier B.V.30172176Čuček, L., Martín, M., Rossmann, I.E.G., Kravanja, Z., Energy, water and process technologies integration for the simultaneous production of ethanol and food from the entire corn plant (2011) Comp. Chem. Eng., 35, pp. 1547-1557Dias, M., Ensinas, A.V., Nebra, S.A., Maciel Filho, R., Rossell, C.E.V., Maciel, M.R.W., Production of bioethanol and other bio-based materials from sugarcane bagasse: Integration to conventional bioethanol production process (2009) Chem. Eng. Res. Des., 87, pp. 1206-1216Dias, M.O.S., Junquiera, T.L., Cavalett, O., Cunha, M.P., Jesus, C.D.F., Rossell, C.E.V., Maciel Filho, R., Bonomi, A., Integrated versus stand-alone second generation ethanol production from sugarcane bagasse and trash (2012) Bioresource Technology, 103, pp. 152-161Guineé, J., (2002) Handbook on Life Cycle Assessment: Operational Guide to the ISO Standards, , Kluwer Academic Publishers, DordrechtNigam, P., Singh, A., Production of liquid biofuels from renewable resources (2011) Prog. Energy Combust. Sci., 37, pp. 52-6
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
Cogeneration In Integrated First And Second Generation Ethanol From Sugarcane
No full textSugarcane bagasse and trash are used as fuels in cogeneration systems for bioethanol production, supplying steam and electricity, but may also be used as feedstock for second generation ethanol. The amount of surplus lignocellulosic material used as feedstock depends on the energy consumption of the production process; residues of the pretreatment and hydrolysis operations (residual cellulose, lignin and eventually biogas from pentoses biodigestion) may be used as fuels and increase the amount of lignocellulosic material available as feedstock in hydrolysis. The configuration of the cogeneration system (boiler pressure, lignocellulosic material consumption and steam production, turbines efficiencies, among others) has a significant impact on consumption of fuel and electricity output; in the integrated first and second generation, it also affects overall ethanol production. Simulations of the integrated first and second generation ethanol production processes were carried out using Aspen Plus, comparing different configurations of the cogeneration systems and pentoses use (biodigestion and fermentation). Economic analysis shows that electricity sale can benefit second generation ethanol, even in relatively small amounts. Environmental analysis shows that the integrated first and second generation process has higher environmental impacts in most of the categories evaluated than first generation. © 2013 The Institution of Chemical Engineers.91814111417Ethanol prices (2011) Technical report, , CEPEA, Center for Advanced Studies on Applied Economics(2009) Bioetanol combustível: uma oportunidade para o Brasil, , CGEE, CGEE, BrasíliaČuček, L., Martín, M., Grossmann, I.E., Kravanja, Z., Energy, water and process technologies integration for the simultaneous production of ethanol and food from the entire corn plant (2011) Comput. Chem. Eng., 35, pp. 1547-1557Dias, M.O.S., Ensinas, A.V., Nebra, S.A., Maciel Filho, R., Rossell, C.E.V., Maciel, M.R.W., Production of bioethanol and other bio-based materials from sugarcane bagasse: integration to conventional bioethanol production process (2009) Chem. Eng. Res. Des., 87, pp. 1206-1216Dias, M.O.S., Cunha, M.P., Jesus, C.D.F., Rocha, G.J.M., Pradella, J.G.C., Rossell, C.E.V., Maciel Filho, R., Bonomi, A., Second generation ethanol in brazil: can it compete with electricity production? (2011) Bioresour. Technol., 102, pp. 8964-8971Dias, M.O.S., Junqueira, T.L., Cavalett, O., Cunha, M.P., Jesus, C.D.F., Rossell, C.E.V., Maciel Filho, R., Bonomi, A., Integrated versus stand-alone second generation ethanol production from sugarcane bagasse and trash (2012) Bioresour. Technol., 103, pp. 152-161Dias, M.O.S., Junqueira, T.L., Jesus, C.D.F., Rossell, C.E.V., Maciel Filho, R., Bonomi, A., Improving second generation ethanol production through optimization of first generation production process from sugarcane (2012) Energy, 43, pp. 246-252Ensinas, A.V., Nebra, S.A., Lozano, M.A., Serra, L.M., Analysis of process steam demand reduction and electricity generation in sugar and ethanol production from sugarcane (2007) Energy Convers. Manage., 48, pp. 2978-2987Ensinas, A.V., Modesto, M., Nebra, S.A., Serra, L., Reduction of irreversibility generation in sugar and ethanol production from sugarcane (2009) Energy, 34, pp. 680-688Franceschin, G., Zamboni, A., Bezzo, F., Bertucco, A., Ethanol from corn: a technical and economical assessment based on different scenarios (2008) Chem. Eng. Res. Des., 86, pp. 488-498Franceschin, G., Sudiro, M., Ingram, T., Smirnova, I., Brunner, G., Bertucco, A., Conversion of rye straw into fuel and xylitol: a technical and economical assessment based on experimental data (2011) Chem. Eng. Res. Des., 89, pp. 631-640Furlan, F.F., Costa, C.B.B., Fonseca, G.D.C., Soares, R.D.P., Secchi, A.R., Cruz, A.J.G.D., Giordano, R.D.C., Assessing the production of first and second generation bioethanol from sugarcane through the integration of global optimization and process detailed modeling (2012) Comput. Chem. Eng., 43, pp. 1-9Grisi, E.F., Yusta, J.M., Dufo-López, R., Opportunity costs for bioelectricity sales in Brazilian sucro-energetic industries (2012) Appl. Energy, 92, pp. 860-867Guinée, J.B., Gorrée, M., Heijungs, R., Huppes, G., Kleijn, R., Koning, A., van Oers, L., Huijbregts, M.A.J., (2002) Handbook on Life Cycle Assessment: Operational Guide to the ISO Standards, , Kluwer Academic Publishers, DordrechtISO Norm 14040:2006 (2006) Life cycle assessment: principles and framework, , ISO, Environmental Management. International Organisation for Standardisation, GenevaISO Norm 14044:2006 (2006) Life cycle assessment. Requirements and guidelines, , ISO, Environmental Management. International Organisation for Standardisation, GenevaKostin, A.M., Guillén-Gosálbez, G., Mele, F.D., Bagajewicz, M.J., Jiménez, L., Design and planning of infrastructures for bioethanol and sugar production under demand uncertainty (2012) Chem. Eng. Res. Des., 90, pp. 359-376Luo, L., van der Voet, E., Huppes, G., An energy analysis of ethanol from cellulosic feedstock - corn stover (2009) Renew. Sustain. Energy Rev., 13, pp. 2003-2011Mello, J.C., Geração de eletricidade a partir de biomassa e biogás (2007) Technical report, , Andrade & Canellas, São PauloNigam, P.S., Singh, A., Production of liquid biofuels from renewable resources (2011) Prog. Energy Combust. Sci., 37, pp. 52-68Ojeda, K., Ávila, O., Suárez, J., Kafarov, V., Evaluation of technological alternatives for process integration of sugarcane bagasse for sustainable biofuels production-Part 1 (2011) Chem. Eng. Res. Des., 89, pp. 270-279Palacios-Bereche, R., Ensinas, A.V., Nebra, S.A., Energy consumption in ethanol production by enzymatic hydrolysis - the integration with the conventional process using pinch analysis (2011) Chem. Eng. Trans, 24, pp. 1189-1194Pellegrini, L.F., Oliveira, S., Combined production of sugar, ethanol and electricity: thermoeconomic and environmental analysis and optimization (2011) Energy, 36, pp. 3704-3715Seabra, J.E.A., Macedo, I.C., Comparative analysis for power generation and ethanol production from sugarcane residual biomass in Brazil (2011) Energy Pol., 39, pp. 421-428Seabra, J.E.A., Tao, L., Chum, H.L., Macedo, I.C., A techno-economic evaluation of the effects of centralized cellulosic ethanol and co-products refinery options with sugarcane mill clustering (2010) Biomass Bioenerg., 34, pp. 1065-1078Soccol, C.R., Vandenberghe, L.P.S., Medeiros, A.B.P., Karp, S.G., Buckeridge, M., Ramos, L.P., Pitarelo, A.P., Torres, F.A.G., Bioethanol from lignocelluloses: status and perspectives in Brazil (2010) Bioresour. Technol., 101, pp. 4820-4825Tao, L., Aden, A., The economics of current and future biofuels (2009) In Vitro Cell. Dev. Biol. - Plant, 45, pp. 199-217Sugarcane prices (2011) Technical report, , UDOP, Union of Biofuel Producer
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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