1,720,962 research outputs found
Comparison Between Cachaça And Rum Using Pattern Recognition Methods
No full textThe differentiation between cachaça and rum using analytical data referred to alcohols (methanol, propanol, isobutanol, and isopentanol), acetaldehyde, ethyl acetate, organic acids (octanoic acid, decanoic acid, and dodecanoic acid), metals (Al, Ca, Co, Cu, Cr, Fe, Mg, Mn, Ni, Na, and Zn), and polyphenols (protocatechuic acid, sinapaldehyde, syringaldehyde, ellagic acid, syringic acid, gallic acid, (-)-epicatechin, vanillic acid, vanillin, p-coumaric acid, coniferaldehyde, coniferyl alcohol, kaempferol, and quercetin) is described. The organic and metal analyte contents were determined in 18 cachaça and 21 rum samples using chromatographic methods (GC-MS, GC-FID, and HPLC-UV-vis) and inductively coupled plasma atomic emission spectrometry, respectively. The analytical data of the above compounds, when treated by principal component analysis, hierarchical cluster analysis, discriminant analysis, and K-nearest neighbor analysis, provide a very good discrimination between the two classes of beverages.521134293433Vancocelos, Y., Cachaça sem mistério (2003) Pesquisa FAPESP, 87, pp. 74-77Decreto FederalBrasil N 4.072, Jan 3, 2002, Art. 91Boscolo, M., Bezerra, C.W.B., Cardoso, D.R., Lima-Neto, B.S., Franco, D.W., Identification and dosage by HRGC of minor alcohols and esters in Brazilian sugar-cane spirit (2000) J. Braz. Chem. Soc., 11, pp. 86-90Nascimento, R.F., Cardoso, D.R., Lima-Neto, B.S., Franco, D.W., Determination of acids in Brazilian sugar cane spirits and other alcoholic beverages by HRGC-SPE (1998) Chromatographia, 48 (11-12), pp. 751-758Nascimento, R.F., Cardoso, D.R., Keukeleire, D., Lima-Neto, B.S., Franco, D.W., Quantitative HPLC analysis of acids in Brazilian cachaça and various spirits using fluorescence detection of their 9-anthrylmethyl esters (2000) J. Agric. Food Chem., 48, pp. 6070-6073Bettin, S.M., Isique, W.D., Franco, D.W., Andersen, M.L., Knudsen, S., Skibsted, L.H., Phenols and metals in sugar-cane spirits. Quantitative analysis and effect on radical formation and radical scavenging (2002) Eur. Food Res. Technol., 215, pp. 169-175Nascimento, R.F., Bezerra, C.W., Furuya, S.M.B., Schultz, M.S., Polastro, L.R., Lima-Neto, B.S., Franco, D.W., Metal profiles of Brazilian cachaças and other international spirits (1999) J. Food Compos. Anal., 12, pp. 17-25Nicol, D.A., Chapter rum (2003) Fermented Beverage Production, 2nd Ed., pp. 263-287. , Lea, A. G. H., Piggott, J. R., Eds.Kluwer Academic/Plenum Plubishers: New WorkFernández, P.L., Pablos, F., Martín, M.J., González, A.G., Multi-element analysis of tea beverages by inductively coupled plasma atomic emission spectrometry (2002) Food Chem., 76, pp. 483-489Bellido-Milla, D., Moreno-Perez, J.M., Hernández-Artiga, M.P., Differentiation and classificafion of beers with flame atomic spectrometry and molecular absorption spectrometry and sample preparation assisted by microwaves (2000) Spectrochim. Acta, Part B, 55, pp. 855-864Arvanitoyannis, I.S., Katsota, M.N., Psarra, E.P., Soufleros, E.H., Kallithraka, S., Application of quality control methods for assessing wine authenticity: Use of multivariate analysis (chemometrics) (1999) Trends Food Sci. Technol., 10, pp. 321-336Pozo-Bayón, M.A., Pueyo, E., Martín-Álvarez, P.J., Polo, M.C., Polydimethylsiloxane solid-phase microextraction-gas chromatography method for the analysis of volatile compounds in wines Its application to the characterization of varietal wines (2001) J. Chromatogr., A, 922, pp. 267-275Martin, M.J., Pablos, F., González, G., Valdenebro, M.S., León-Camacho, M., Fatty acids profiles as discriminant parameters for coffee varieties differentiation (2001) Talanta, 54, pp. 291-297Valera, P., Pablos, F., González, G., Classification of tea samples by their chemical composition using discriminant analysis (1996) Talanta, 43, pp. 415-419Pet'ka, J., Mocàk, J., Farkas, P., Balla, B., Kovac, M., Classification of Slovak varietal white wines by volatile compounds (2001) J. Sci. Food Agric., 81, pp. 1533-1539Aylott, R.I., Clyne, A.H., Fox, A.P., Walker, D.A., Analytical strategies to confirm Scotch whisky authenticity (1994) Analyst, 119, pp. 1741-1746González-Arjona, D., González-Gallero, V., Pablos, F., González, A.G., Authentication and differentiation of Irish whiskeys by higher-alcohol congener analysis (1999) Anal. Chim. Acta, 381, pp. 257-264Saxberg, B.E., Duewer, D.L., Booker, J.L., Pattern recognition blind assay applied to forensic separation of whiskies (1978) Anal. Chim. Acta, 103, pp. 201-212Herranz, A., Serna, P., Barro, C., Multivariete statistical methods applied to the differentiation of rum brands (1990) J. Sci. Food Agric., 51, pp. 555-560Etiévant, P., Schlich, P., Cantagrel, R., Bertrand, A., Bouvier, J.C., Varietal and geographic classification of french red wines in terms of major acids (1989) J. Sci. Food Agric., 46, pp. 421-438Aguilar-Cisnero, B.O., López, M.G., Richling, E., Heckel, F., Schreier, P., Tequila authenticity assessment by headspace SPME-HRCG-IRMS analysis of 13C/ 12C and 18O 16O ratios of ethanol (2002) J. Agric. Food Chem., 50, pp. 7520-7523Beebe, K.R., Pell, R.J., Seasholtz, M.B., Pattern recognition (1998) Chemometrics: A Practical Guide, pp. 62-125. , Wiley: New YorkFerreira, M.M.C., Multivariate QSAR (2002) J. Braz. Chem. Soc., 13, pp. 742-753Wold, S., Josephson, M., Multivariate calibration of analytical data (2000) Encyclopedia of Analytical Chemistry, pp. 9710-9736. , Wiley: Chichester, U.
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
Evaluation Of Brazilian Woods As An Alternative To Oak For Cachaças Aging
No full textCachaça was aged for 6 months in small casks of oak and eight different Brazilian woods (amarelo, amendoim, balsamo, jatoba, louro, pau d'arco, pau d'oleo, and pereiro) in order to determine total phenols, UV-visible spectra differences, and sensorial acceptance. Also used were 200-l casks of oak and pereiro for aging cachaça for 4 years to characterize sensorial descriptors and acceptance. The results suggest that amendoim and pereiro followed by jatobá are good candidates to replace oak in the construction of cachaça aging casks. It was also observed that when using oak casks as a standard the major changes in the sensory properties occurred in the first 21 months of aging. The principal components analysis of UV-visible absorption spectra of the same beverage stored in casks made of different woods allowed identification of the wood in which the beverage had been aged. © Springer-Verlag 2003.21818387(2001) Cachaça: The Authentic Brazilian Drink, , ABRABE, São PauloNascimento, R.F., Cardoso, D., Lima-Neto, B.S., Franco, D.W., (1998) Chromatography, 48, pp. 758-762Boscolo, M., Lima-Neto, B.S., Franco, D.W., (1995) Engarrafador Mod, 41, pp. 30-33Lima-Neto, B.S., Bezerra, C.W.B., Polastro, L.R., Campos, P., Nascimento, R.F., Furuya, S.M.B., Franco, D.W., (1994) Quím Nova, 17, pp. 220-224Nascimento, R.F., Marques, J.C., Lima-Neto, B.S., Franco, D.W., (1997) J Chromatography, 782, pp. 13-16Bettin, S.M., Isique, D.I., Franco, D.W., Andersen, M.L., Knudsen, S., Skibsted, L.H., (2002) Eur Food Res Technol, 215, pp. 169-175Cardello, H.M.A.B., Faria, J.B., (1997) Bol CEPPA, 15, pp. 87-100Cardello, H.M.A.B., Faria, J.B., (1998) Ciênc Tecnol Aliment, 18, pp. 169-175Faria, J.B., Deliza, R., Rossi, E.A., (1998) Ciênc Tecnol Aliment, 13, pp. 90-93Nishimura, K., Matsuyama, R., Maturation and maturation chemistry (1989) The Science and Technology of Whiskies, pp. 235-263. , Piggott JR, Sharp R, Duncan REB (eds). Longman, Essex, EnglandReazin, G.H., (1981) Am J Enol Vit, 32, pp. 283-289Kloster, M.B., (1974) J Am Water Works Assoc, 66, pp. 44-46Stone, H., Sidel, J., (1993) Sensory Evaluation Practices, 2nd Edn., , Academic, New YorkMeilgaard, M., Civille, G.V., Carr, B.T., (1987) Sensory Evaluation Techniques, 3rd Edn., , CRC, Florida(1983) SAS User's Guide, , SAS Inst, Cary, USACadet, F., Offman, B., (1997) J Agric Food Chem, 15, pp. 1166-1171Massart, D.L., Vandeginste, B.G.M., Deming, S.N., Michote, Y., Kaufman, L., (1988) Chemometrics: A Textbook, , Elsevier, New YorkBoscolo, M., Andrade-Sobrinho, L.G., Lima-Neto, B.S., Franco, D.W., (2002) J Assoc off Anal Chem Int, 85, pp. 1-7Dias, S., Maia, A., Nelson, D., (1998) Ciênc Tecnol Aliment, 18, pp. 331-33
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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