1,720,989 research outputs found
Processo di estrazione in fase supercritica accoppiata con microcavitazione ultrasonica e microonde, assistita da algoritmo a sincronizzazione combinata
No full textBigger Fish to Fry: Evidence (or Lack of) for Fish Consumption in Ancient Syracuse (Sicily)
Full text linkFish and fish products are considered important sources of nutrition due to their high protein, fat, and fat-soluble vitamin content. These food items have been extensively discussed and celebrated in various genres of Greek literature. However, there is a discrepancy between the rich textual evidence of fish cooking and consumption and the limited archaeological evidence of fishing gear, especially with respect to Greek Sicily. Such scarcity of evidence is particularly evident in the Archaic period. To address the issue of fish consumption in Greek Sicily and to determine the role of fish in the local communities’ diet, this study focuses on the new data that have emerged from stable isotopes analysis on skeletal remains from a recently discovered Archaic period necropolis in Syracuse. The study analyzes the dietary habits of the individuals buried in the necropolis and establishes possible connections between burial practices and diet. Additionally, the study compares the dietary patterns with the social status of the individuals, as demonstrated by the funerary context. The comparison of the new evidence with similar contexts will allow for a critical review of the literary sources and the reinterpretation of the archaeological record. Through this, the study aims to establish the role of fish in the diet of the Greeks of Sicily and their significance at the dining table
Surface and Bulk Investigations of Organ Metal Pipe Degradation
No full textAbstractIn literature the most studied organ degradation processes are related to instruments located in Northen Europe where the ageing of metal alloys is influenced by the environment and the climate typical of those regions. This paper focuses on some examples of degraded organ pipes coming from several parts of Sicily (the biggest island of the Mediterranean Sea) characterized by different environmental and climate conditions typical for the Mediterranean area. Investigation on the specific causes that had produced the degradation was performed by using X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy coupled with Energy-Dispersive X-ray analysis, (SEM-EDX) and X-Ray Diffraction (XRD). Three different kinds of degradations were found: the formation of tin dioxide blisters on the tin based pipes caused by normal oxidation processes induced by the atmospheric oxygen; another tin oxidation process results in tin chloride phases formation; finally, in the case of lead pipes, the degradation is related to the formation of lead nitrate salts
Archaeology of psychotropic substances: The problem of analytical detection of ayahuasca
No full textThe primary objective of this article is to provide a comprehensive overview of the challenges involved in detecting ancient ayahuasca, a traditional hallucinogenic drink from the Amazon region, which is prepared using Banisteriopsis caapi liana and other plants, by utilizing advanced analytical techniques. The presence of harmine and harmaline in Andean archaeological findings has led certain authors to speculate that the Banisteriopsis liana may have been the source plant responsible for their occurrence. Consequently, the utilization of this liana can be traced back to at least 500 CE. However, a combination of archaeological, ethnobotanical, biochemical and analytical chemistry considerations has rendered uncertain the true origins of the presence of harmine and harmaline in ancient mummies and artifacts. Thus, the archaeological evidence does not convincingly prove the ancient usage of ayahuasca
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
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
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