1,720,988 research outputs found
Assessment of occupational health and safety for marine cage culture: l-type matrix risk analysis
Full text linkAs marine cage aquaculture continues to increase its volume in global protein food production, the demand for workers and labor continues to grow. This increasing demand, coupled with the fact that the industry is already risky in terms of occupational health and safety, makes risk assessment even more critical. The present study was conducted with engineers, trainees, and employees working at five different marine cage aquaculture facilities, as well as academicians from three different universities. As a result of the questionnaire conducted using the L-type 5x5 matrix method, the areas with the highest risk assessment scores (RASs) were identified as net cages (RAS: 9.7±3.3), ports (RAS: 10.0±2.0) and package units-cold storage (RAS: 9.6±3.3). Although no significant differences were observed among the occupational groups, significant variations were noted based on the working area (p>0.05). Notable differences in opinions were observed, particularly between academicians/trainees and engineers/employees. As a result, this study will serve as a guideline for both marine cage aquaculture facilities and all personnel, as well as for future research
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
Operating parameters affecting biofloc technology: carbon source, carbon/nitrogen ratio, feeding regime, stocking density, salinity, aeration, and microbial community manipulation
No full textThe world population continues to increase day by day. Therefore, aquaculture needs to grow in order to response the need for protein foods and to cope with the problem of scarcity. However, this enlargement should require taking place in a sustainable way in order to protect the environment and natural resources. The rapid development in the production of seafood as a food sector brought several issues that are necessary to be studied. Particularly, the most important limitations of conventional aquaculture are feed and feeding regimes, high volumes of water requirement, and its pollution potential to natural water resources. Biofloc technology (BFT) is a sustainable aquaculture method for pollution prevention that is based on the principle of reuse of nitrogen-based pollutants which are considered organic waste in aquaculture. In this review, the studies in the literature that considered the parameters affecting BFT are examined. BFT holds a promising response to the global concern of making aquaculture more sustainable. Considering the water quality, fish growth, and immunological positive effects, it is foreseen that BFT systems will be important in aquaculture in the future. Currently, operational parameters are mainly adjusted on a trial-and-error way, and there is a clear need to shift towards a more scientific-based approach to be able to commercialize this technique
Natural water treatment system: the potential of applying artificial floating island technology in lakes, ponds and dam lakes in Turkey
Full text linkBu çalışmada bir fitoremedasyon stratejisi olan yapay yüzen ada (YYA) teknolojisinin Türkiye göl, gölet ve
baraj göllerinde uygulanma potansiyeli incelenmiştir. Küresel ısınma ve buna bağlı olarak meydana gelen
iklim değişikliği ile birlikte su kaynakları üzerine olan baskı her geçen gün daha da artmaktadır. Ayrıca artan
çevre kirliliği, doğadaki canlılara doğrudan ve/veya dolaylı olarak zarar vermekte ve yaşamlarını olumsuz
yönde etkilemektedir. Bu kapsamda ülkemizde bulunan göl, gölet ve baraj göllerinin olumsuz küresel ve
çevresel koşullara karşı önem değeri son yıllarda artmıştır. İçme suyu kaynağı, tarımsal alanları sulama, rekreasyon amacıyla kullanımı ve içerisinde bulunan ekosistem dikkate alındığında göl, gölet ve baraj göllerinin
iyileştirilmesi için yenilikçi, sürdürülebilir ve ekonomik çözüm önerileri gerekmektedir. Ülkemizde var olan
doğal suların mevcut trofik durumu dikkate alındığında ötrofikasyon potansiyeline sahip birçok göl, gölet
veya baraj gölü tespit edilmiştir. Bu organik kirlilik yükünü iyileştirmek için dünya üzerinde yaygın olarak
uygulanan YYA teknolojisi oldukça ekonomik bir alternatif doğal arıtım sistemidir. Literatürde var olan çalışmalar YYA teknolojisinin genellikle laboratuvar ve pilot ölçekli uygulanmasına odaklanmıştır. İlerleyen
süreçte YYA teknolojisinin gerçek ölçekli uygulanması hem bilimsel hem de ülke ekonomisi için önemli bir
katma değer sağlayacaktırIn this study, the implementation potential of artificial floating island (AFI) technology, which is a phytoremediation strategy, was investigated in Turkish lakes, ponds and reservoirs. The pressure on water resources
is increasing ever with the global warming as well as the effect of climate change. In addition, increasing
environmental pollution directly and/or indirectly harms the organisms thus has negative effects on their lives.
In this context, the importance of lakes, ponds and dam lakes in Turkey against adverse global and environmental conditions has increased in recent years. Innovative, sustainable and economical solutions are required
for the improvement of lakes, ponds and dam lakes, considering that these are main resources of drinking
water, irrigation of agricultural lands, and recreational activities. Considering the current trophic state of natural waters in our country, many lakes, ponds or dam lakes have been identified with eutrophication potential.
AFI technology, which is widely established globally to remediate such organic pollution load, is a highly
economical alternative treatment system. Previous studies have generally focused on the laboratory and pilot
scale implementation of AFI technology. In the future, full-scale establishment of AFI technology will provide significant added value for both the scientific and the national economy
A new herbal anesthetic agent for common carp (Cyprinus carpio) sedation and anesthesia: nutmeg (Myristica fragrans) essential oil
Full text linkIn aquaculture, interest in natural essential oils is increasing alongside synthetic anesthetic agents. In this context, the anesthetic efficacy of nutmeg essential oil, which had not been previously tested, was investigated in common carp (Cyprinus carpio). The study, conducted using three different concentrations (800 mu L/L "LC", 1,200 mu L/L "MC", and 1,400 mu L/L "HC"), found that induction times were 5 10(3)/mu L, >1 10(6)/mu L, >6 g/dL, and >12%, respectively. However, they returned to control levels after 8 h. Histological signs were more severe with higher concentrations, and necrosis was only observed in the HC group. Alkaline comet assay results showed DNA migration only in the HC group. According to the PROMETHEE multi-criteria decision-making model, the LC concentration is suitable for sedation, while the MC concentration should be used for deep anesthesia. The current study demonstrates that nutmeg essential oil can be used as an alternative to commercial synthetic anesthetic agents
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