1,720,977 research outputs found
Mathematical Modeling of Hot-Air Drying of Osmo-dehydrated Nectarines
Get PDFThe influence of osmotic pretreatment on nectarines with solutions of glucose syrup and sorbitol and subsequent dehydration at different temperatures (60°C, 70°C, or 80°C) was evaluated. The kinetics of moisture loss during drying was obtained and mathematical models were adjusted to estimate the kinetic parameters. Effective diffusion coefficients were calculated using Fick's second law. All drying kinetics exhibited only a falling-rate period during hot-air drying owing to moisture loss in the osmotic pretreatment. Moisture loss was favoured by the use of sorbitol, whereas the diffusivity of water increased when glucose was used as an osmotic agent. Logarithmic and Midilli et al. models best described the changes in moisture over time, whereas Fick's second law estimated water diffusion coefficient values between 4.96×10-9 and 2.43×10-8 m2 s-1. These models may be employed to predict the optimum conditions for osmo-dehydrating nectarines under hot-air drying at the industrial level.Fil: Rodriguez, Maria Marcela. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ingeniería Olavarría. Departamento de Ingeniería Química. Núcleo de Investigación y Desarrollo de Tecnología de Alimentos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Mascheroni, Rodolfo Horacio. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigación y Desarrollo en Criotecnología de Alimentos. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Centro de Investigación y Desarrollo en Criotecnología de Alimentos; ArgentinaFil: Quintero Ramos, Armando. Universidad Autónoma de Chihuahua; Méxic
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
Efficient extraction of fructans from sotol plant (Dasylirion leiophyllum) enhanced by a combination of enzymatic and sonothermal treatments.
Get PDFThe effects of different extraction methods of water-soluble carbohydrates (WSC) from the sotol plant (Dasylirion leiophyllum) were investigated. Sotol fragments were extracted at 40 and 70 °C, under thermal treatment (T), pre-enzymatic thermal treatment (PET), sonothermal treatment (ST), and pre-enzymatic sonothermal treatment (PEST) conditions: fructose, glucose, sucrose, and fructans were analyzed by HPLC and the total water soluble carbohydrates was determined. At 70 °C, the highest WSC values (482 mg/gd.m.) were obtained, with a fructan proportion of 69%. Pre-enzymatic treatment at 70 °C resulted in a high WSC content with the highest fructans proportion (87%) and lowest contents of RS and sucrose. The effect of the interaction between ultrasound and enzymatic treatments was limited by the high-temperature effect (70 °C), thereby minimizing the extraction. Microscopy analyses showed cell-wall modifications with the ST and PET treatments, which caused an increase in the total soluble sugars. The combination of enzymatic and sonothermal treatments at 70 °C resulted in the extraction of fructans in a higher yield and with less degradation. This circumvents the need for traditional high-energy processes, which could be beneficial for the extraction of WSC such as fructans from sotol or other economically important plants.Fil: Pardo Rueda, Abril J.. Universidad Autónoma de Chihuahua. Facultad de Ciencias Químicas; MéxicoFil: Quintero Ramos, Armando. Universidad Autónoma de Chihuahua. Facultad de Ciencias Químicas; MéxicoFil: Genovese, Diego Bautista. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Planta Piloto de Ingeniería Química (i); Argentina. Universidad Nacional del Sur; ArgentinaFil: Camacho Dávila, Alejandro. Universidad Autónoma de Chihuahua. Facultad de Ciencias Químicas; MéxicoFil: Zepeda Rodríguez, Armando. Universidad Nacional Autónoma de México; MéxicoFil: Contreras Esquivel, Juan C.. Universidad Autónoma de Coahuila. Facultad de Ciencias Químicas; MéxicoFil: Bizarro, A. Patricia. Universidad Nacional Autónoma de México; Méxic
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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