1,720,981 research outputs found
Multicolor-Based Bit-Loading for MIMO Underwater Optical Wireless Communication
No full textTraditional underwater communication methods, such as acoustic signaling, are limited by low data rates and high latency due to the slow propagation speed of sound in water. As an alternative, optical wireless communication (OWC) offers the potential for significantly higher data rates and lower latency, leveraging the high speed of light propagation. This paper considers an innovative approach to underwater optical wireless communication where the transmitter employs multiple Light Emitting Diodes (LEDs) or Laser Diodes (LDs) to send data across different wavelengths. The receiver is equipped with an array of photodiodes, each paired with wavelength-selective optical filters to differentiate the incoming signals. The primary objective of this work is to optimize the modulation formats used by the system. This optimization process takes into account the unique characteristics of the underwater optical channel, such as absorption and scattering, as well as the potential crosstalk between channels. By carefully adjusting the modulation formats, the system aims to maximize the data rate while adhering to power and reliability constraints
Single or Combined Applications of Zinc and Multi-strain Probiotic on Intestinal Histomorphology of Broilers Under Cyclic Heat Stress
No full textTwo-hundred-eighty-day-old broiler chicks were divided into seven groups. The groups were designated as T1, thermoneutral zone; T2, heat stressed (HS); T3, HS + zinc (Zn) supplementation (30 mg/kg); T4, HS + Zn (60 mg/kg); T5, HS + probiotic (0.1 g/kg); T6, HS + probiotic (0.1 g/kg) + Zn (30 mg/kg); and T7, HS + Zn (60 mg/kg) + probiotic (0.1 g/kg). Significant decrease (p < 0.05) was observed in villus height (VH), VH to crypt depth ratio, and villus surface area of all intestinal segments in the T2 group when compared with the T1 group. The same parameters had significantly higher (p < 0.05) values in the jejunum and ileum of the Zn- and probiotic-supplemented groups (alone + combination) when compared with the T2 group. The birds exposed to HS showed fewer (p < 0.05) intraepithelial lymphocytes (IELs) in the jejunum and ileum than the T1 group, while their count increased in the jejunum and ileum with dietary treatments. In conclusion, Zn and probiotic positively modulated the intestinal microstructures of broilers kept under high environmental temperature
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
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
Modélisation d'une installation pilote de valorisation des boues résiduelles issues des moulins à huile d'olive pour la production de biocarburant par application de la pyrolyse catalytique intégrant la réfrigération par sorption pilotée par énergie solaire et/ou chaleur récupérée sur les gaz de pyrolyse
No full textLes boues d'eaux usées des moulins à huile (OMWS) constituent un problème environnemental majeur pour les pays producteurs d'huile d'olive. Diverses stratégies d'élimination des OMWS ont été proposées, en particulier la pyrolyse rapide qui est considérée comme une technique prometteuse et dont le principal produit est la bio-huile qui trouve son application comme diesel vert dans les moteurs à combustion interne. Dans la pyrolyse rapide, les vapeurs de bio-huile sont refroidies en utilisant une machine de réfrigération à compression. L'objectif de la thèse est d'intégrer une machine de réfrigération par absorption en récupérant la chaleur du processus, en se substituant à la machine de réfrigération par compression et réduisant ainsi la consommation d'électricité. Il s'avère que le procédé de réfrigération par sorption permet une meilleure efficacité énergétique. Le ratio exergie de la bio-huile sur exergie électrique passe de 27 à 102 du système conventionnel au système à sorption. Une analyse économique est effectuée pour déterminer le prix de vente minimum de la bio-huile en tant que combustible (MFSP). Il est observé que le MFSP est réduit de 3,63 €/GGE à 2,99 €/GGE entre le système conventionnel au système à sorption. La différence provient de la consommation d’énergie électrique évitée. L’analyse de sensibilité économique met en évidence que le coût de production de la bio huile diminue plus rapidement que l’augmentation du coût d’investissement induit par cette augmentation de production.Oil mill sewage sludge (OMWS) is a major environmental problem for olive oil producing countries. Various OMWS elimination strategies have been proposed, in particular rapid pyrolysis which is considered a promising technique and whose main product is bio-oil which finds its application as green diesel in internal combustion engines.In rapid pyrolysis, bio-oil vapors are cooled using a compression refrigeration machine. The objective of the thesis is to integrate an absorption refrigeration machine by recovering the heat of the process, replacing the compression refrigeration machine and thus reducing electricity consumption.It turns out that the sorption refrigeration process allows for better energy efficiency. The ratio of bio-oil exergy to electrical exergy goes from 27 to 102 from the conventional system to the sorption system.An economic analysis is performed to determine the minimum selling price of bio-oil as fuel (MFSP). It is observed that the MFSP is reduced from 3.63 € / GGE to 2.99 € / GGE between the conventional system and the sorption system. The difference comes from the electricity consumption avoided. The economic sensitivity analysis shows that the production cost of bio oil decreases more rapidly than the increase in the investment cost induced by this increase in production
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