1,720,984 research outputs found
Optimization of Hermetia illucens (L.) egg laying under different nutrition and light conditions
Full text linkThe black soldier fly Hermetia illucens is gaining growing interest as a tool for the valorisation of bio-waste in a circular economy perspective. Although a wide variety of studies are available for larvae rearing, the indoor breeding of adults still presents a great challenge for industrial purposes. This study was designed to assess the simultaneous influence of 3 different light sources (the Mix of LED UV:blue:green 1:1:3, White LED, Neon light) and 3 types of nutrition (sugar and water, only water, no sugar no water) on adult performances, obtaining different egg production parameters that included the number and weight of the egg masses and single eggs laid by the females, the duration of pre-oviposition and oviposition period, the adult life span, the hatchability of the eggs. Our results showed that production parameters are influenced mainly by nutrition rather than light factor, although light plays an important secondary role. Moreover, the presence of sugar positively affects the egg production (12,93-27,10 mg eggs/female) and increases oviposition period (18,2-31,8 days) and adult lifespan (20,79-27,11 days). Light sources also affect egg production parameters, with the exposure to the Mix of LEDs resulting in the best performance of flies. Results obtained from this study are very useful for the design and management of an efficient industrial black soldier fly mass rearing process
From Food Processing Leftovers to Bioplastic: A Design of Experiments Approach in a Circular Economy Perspective
Full text linkAiming at reducing the environmental impact of low density polyethylene (LDPE) when employed as mulching film, this study was focused on the partial substitution of the material with proteins extracted from Hermetia illucens, also known as black soldier fly (BSF). Insects were reared on chicken manure and food leftovers in a circular economy perspective. To evaluate the effects of processing conditions and amount of BSF proteins on the properties of the final material the Design of Experiments technique was employed. Samples were obtained by hot mixing and compression molding, and their thickness, tensile stress, tensile strain, and Young modulus were measured and analyzed. According to mathematical models, the addition of BSF proteins in the mixture results in increased homogeneity and Young modulus of the material and in reduced tensile stress and strain. Results indicated that a LDPE-BSF proteins mixture of 50–50 wt%, processed at relative low temperature (130 °C) and time (3 min), ensures properties closer to pure molded LDPE (thickness = 0.8 mm, tensile stress = 6 MPa, tensile strain = 15% and Young modulus = 200 MPa) with lower environmental impact thanks to the high BSF proteins addition. Thereafter, BSF proteins can be employed as additive for LDPE for agricultural purposes, with processing methods feasible in an industrial perspective
First detection of Halyomorpha halys Stål, a new invasive species with a high potential of damage on agricultural crops in Romania
No full textThe presence of the Brown Marmorated Stink Bug Halyomorpha halys Stål (Heteroptera, Pentatomidae) is signaled for the first time in Romania, in the Botanical Garden of Bucarest. This polyphagous bug, native to Asia, is recorded as an extremely invasive pest of many agricultural crops in the countries where it has been introduced (USA, Italy). The current distribution and pest status, morphology and biology are described. Although the majority of individuals were collected from the Botanical Garden, several other H. halys were observed in the urban area, several kilometers away, suggesting that this species is already spread out in the city, and that its presence in Romania could date back to at least 1-2 years ago. Considering the potential serious risk for agriculture in Romania, the necessity to develop a monitoring strategy in field crops for early detection is suggested
Dispositivo per la deposizione di uova di ditteri stratiomiidi e un apparato per l’allevamento di ditteri stratiomiidi comprendente detto dispositivo
No full text
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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