1,721,133 research outputs found
Quality indexes and composition of 13 commercial hemp seed oils
No full textCold-pressed hemp seed oil can be a valuable source from both nutritional and sustainability points of view. Thirteen hemp seed oils (HSOs) have been characterized, also with useful data about the bioactive compounds present in this product, considering that the hemp seed oil industry lacks of specific standard for the quality control of this oil. Samples were collected from the market and 12 of the 13 HSOs were claimed to be coldpressed on the label. The hydrolytic and oxidative states were investigated according to the standards provided by the Codex Alimentarius. HSOs showed a wide range of free acidity (from 0.89 ± 0.02 to 4.58 ± 0.03 mg KOH/g) and peroxide values (from 3.97 ± 0.25 to 23.89 ± 0.74 mEqO2/kg). The HSOs had a ratio of ω6:ω3 from 2.60 to 3.67. γ-tocopherol ranged from 594 to 967 mg/kg and a wide range in the content of chlorophylls (from 0.78 to 75.7 mg/kg) and carotenes (from 2.53 to 33.9 mg/kg) was seen. This suggests that different extraction conditions (production plants, extraction temperatures and time) were used. Cannabinoids were also present:
cannabidiolic acid (CBDA) (from 4.25 to 91.6 mg/kg), Δ9-tetrahydrocannabinol (Δ9-THC) (up to 5.29 mg/kg) and tetrahydrocannabinolic acid (THCA) (up to 5.00 mg/kg). Lastly, the analysis of the volatile profile highlighted the presence of some specific cannabis terpenes, such as α-pinene and β-pinene
Excerpts from an overview on most common and emerging fraud in the olive oil sector
No full textWithin the H2020 OLEUM project, a review of most common infringements (fraud or non-compliance) was conducted with the support of two questionnaires specifically addressed to all the stakeholders and regulatory bodies in the olive oil sector. This review was undertaken with great urgency after the European Commission’s 2019 annual report on food fraud identified fats and oils as the most notorious category in the system, and olive oil was found to be the most reported produc
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
High-Temperature 13-Bit Delta-Sigma ADC in Standard SOI CMOS Operating Up to 260°C
No full textIn this paper, we present a 1.8-V 2nd-order DeltaSigma ADC for high-temperature operation, featuring 13 bits of ENOB and 150 Hz of bandwidth at 260°C. The chip is designed with a 180-nm SOI CMOS process, pushed well beyond its temperature qualification limit of 175°C through ad-hoc design techniques. The junction and channel leakage currents dependence on the temperature are carefully assessed and their negative effects on circuit performance are compensated using clock boosting and dummy transistor techniques. The converter, which has been experimentally characterized up to 270°C, achieves excellent performance up to 260°C: a Signal-to-Noise Ratio of 86 dB and a Signal-to-Noise-and-Distortion Ratio of 82 dB have been measured within a bandwidth of 150 Hz and for an oversampling ratio of 512
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
Le sostanze recuperabili dai reflui oleari: aggiornamento della ricerca applicata
No full textIl libretto descrive le attività condotte nel triennio 2009-2011 di dimostrazione d'uso e di possibilità offerte da un impianto di filtrazione delle acque di vegetazione portatile, assemblato in un container.
Si tratta di un progetto finanziato dalla Comunità Europea, attraverso l'associazione di produttori oleari della Regione Emilia-Romagna ARPO.
Il capitolo, nello specifico, affronta gli aspetti analitici e di valutazione della qualità degli estratti (dai concentrati) di fenoli ottenuti e delle acque (dai permeati)
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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