6 research outputs found
INTERACTION BETWEEN AQUATIC BIVALVE SPECIES AND GLOBAL CLIMATE CHANGE
No full textClimate changes affect the bio-ecological characteristics of living things in aquatic ecosystems. It is the main factor in accelerating the geographical distribution of species, especially by triggering species invasions. Also, climate change is important as it increases the risk of infection between species. Bivalve species are among the important fishery species due to their high nutrient content, widespread distribution in aquatic ecosystems, rapid growth, and ecological and commercial values. Climate change and its effects have caused some invasive bivalve species, which can spread rapidly in aquatic environments, to be included in the list of biological pollutants due to their ecological and economic effects. In this review, the role of climate change in the growth performance, economic and ecological effects of bivalve organisms and the sustainable alternatives that can be applied at the solution point were evaluated
The Effect of Fish Meal and Plant-Based Diets on the Growth and Nutritional Composition of White Worms (Enchytraeus albidus Henle, 1837) in Various Substrates
No full textIn this study, the growth and nutritional composition of Enchytraeus albidus (white worm) were investigated using different combinations of culture substrates and feeds. The aim was to determine the utilization of White worm for recycling the fish feeds in case of expiration. The white worms were either given a plant-based diet or a fish feed-based diet (commercial extruded Seabass feed) in four different culture substrates (rice husk, peat, cocopeat, garden soil). There were altogether eight experimental groups with triplicates. The initial stocking density of white worms was 150 worms/unit (2.2 Liters of cylindrical containers), and all the experiments were carried out in the dark at a constant temperature at 18oC. Worms were collected from the substrate by heat treatment and the counting was done manually, using dissection tools. Proximate composition of the produced white worms was measured with regard to given ratios of the protein, carbohydrate and lipid sources provided from the feed materials. The plant-based diet yielded the highest worm density of the study (2220 worms/unit) while the garden soil was used as substrate. In comparison, the fish feed-based diet fed white worms reached a significantly lower density (627 worms/ unit) although the optimal nutritional value for the fish diet was ensured. These results showed that the carbohydrate content of the feed for white worm should be adjusted for optimal growth. Furthermore, the use of a combined plant- and fish feed-based diet can result in high growth performance and improved nutritional value during fish feed production
Growth and Reproductive Capacity of the Endemic Fish Species Egirdira nigra (Teleostei: Leuciscidae)
No full textObjective: In this study, various characteristics of the Eğirdir minnow, an endemic species of Anatolia that inhabits specific/narrow areas, were determined from 142 individuals sampled between 2021 and 2022. These characteristics include length-weight relationship, Von Bertalanffy growth equation, condition factors, spawning season, first spawning size, and fecundity attributes. Materials and Methods: A monthly sampling of 142 specimens of Egirdira nigra was conducted using multi-mesh gill nets between March 2021 and April 2022. Results: The sampled E. nigra population consists of individuals aged II-V, with 57.75% female and 42.25% male. The length-weight relationships were as follows: W = 0.0059 L3.5445, R² = 0.9312 (female + male), W = 0.009 L3.3077, R² = 0.9353 (male), and W = 0.0058 L3.5679, R² = 0.9233 (female). The condition factors were calculated as 1.67 (male) and 1.87 (female). The gonadosomatic index was highest in March (13.95) and lowest in August (0.5073). The population’s mean fecundity was calculated as 4787 individuals/egg. Conclusion: Although the population exhibits a wide age range and positive growth values, it is believed to be under significant threat from invasive/exotic species sharing the same environment, such as Atherina boyeri, Gambusia holbrooki, Pseudorasbora parva, and Carassius gibelio. Therefore, the conservation of species and their habitats is of paramount importance
Seiðr, kunnosta, fjölkyngi. Le parole della magia nelle prime saghe della Heimskringla
No full textThis article aims to point out those narrative and lexical elements that, in the first sagas of Snorri’s Heimskringla, relate to magic and the use of magic. In the Nordic world, magic was strictly connected to ancient pagan beliefs; for this reason, magic elements are more common in those sagas settled in a pagan environment. Nevertheless, the pagan rituals and cult are never openly described, because the sagas were written in a Christian and Christianised context. Their author was not interested in conveying the old deviate belief of Paganism to his contemporaries, but only in narrating the heroic past of Norwegian kings. In the Sagas, thus, pagan cults are regarded as mere mistakes, due to the kings’ naiveté. Paganism could not possibly undermine the kings’ noble progeny, which included, among others, Olaf the Saint. This is the reason why many of the magic aspects in the Sagas are related to foreign, non Scandinavian, characters, especially Sámi. They are described as wise and fearsome at the same time, expert in seiðr, that is, magic stricto sensu. They possess superior knowledge, which, however, is not a merit, being, on the contrary, what characterizes them in a negative way. The art of seidr, in fact, though symptomatic of their knowledge, is a devious art, connected to vicious and lascivious behaviours (ergi). The episodes about magic arts recounted in the Sagas reveal aspects typical of Sámi’s shamanism. It is quite likely that such shamanic rituals were not only typical of Sami people but also of Scandinavians. This is, however, not testified in the Sagas, which reject any
Scandinavian connection with magic, pushing the magic practices beyond the Scandinavian borders and attributing them to foreign peoples
Performance improvements for unplanned high density wireless LANs
No full textChaotic unplanned IEEE 802.11 WLAN deployments are becoming the norm and such residential deployments have many nearby access points (APs) and stations on the same channel, either due to lack of coordination or insufficient available channels. Thus, inter-cell interference in these high-density settings is common but not well-understood. Our evaluations for such interfering deployments reveal that up-to two-thirds of the WLAN system capacity may be lost in a typical large-apartment building with 50 interfering WLANs In this thesis, we first report on our analysis of high-density unplanned WLANs' performance under realistic scenarios. We find that with a typical TCP-dominant workload, cumulative system throughput is characterized by the number of actively interfering APs rather than the number of clients. We verify that due to TCP flow control, the number of backlogged stations in such a network equals twice the number of active APs. Thus, a single AP network proves very robust even with over one hundred clients, while multiple interfering APs lead to a significant increase in collisions that reduces throughput and affects multimedia traffic. Based on our analysis, we suggest a practical contention window adaptation technique, WiPhi, using information on the number of nearby APs rather than clients. We also point out the need for collision-resilient rate adaptation in such a setting. Together these techniques can largely recover the loss in cumulative throughput in a setting with strongly interfering APs. We then propose an alternative ISP-level solution, HeedNet, recovering lost performance by scheduling the IP packets of the bulk traffic at the ISP edge-router towards interfering APs. It requires no changes to the MAC protocol and the APs of the network, making it a viable solution for ISPs. We evaluate HeedNet via simulations and an actual deployment to show that a significant portion of the lost system capacity can be regained (more than 2.2X improvement compared to legacy). HeedNet also increases the fairness, reducing starvation among WLANs. Additionally, we show that HeedNet improves the performance of the non-scheduled (i.e., non-bulk) traffic considerably, such as VoIP, due to the reduced-collision rate environment it creates.Ph.D.Includes bibliographical referencesIncludes vitaby Mesut Ali Ergi
Brennu-njáls saga: projeto tradutório e tradução para o português
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Estudos da Tradução, Florianópolis, 2014.A tese contém a tradução completa para o português da Brennu-Njáls saga (Saga de Njáll), obra islandesa anônima da segunda metade do séc. XIII, considerada a mais importante das sagas de islandeses (Íslendingasögur) e um dos expoentes da literatura escandinava medieval. Inicia-se com uma apresentação geral sobre a obra e seu contexto literário, salientando alguns aspectos relevantes de sua recepção moderna, e então, servindo-se de ideias de Lawrence Venuti e Antoine Berman, faz uma proposta de tradução estrangeirizante que almeja, por meio da escolha do texto-fonte e de estratégias tradutórias, desviar-se de algumas tendências constatáveis no contexto de recepção da tradução. Para tal, serve-se o tradutor da noção de horizonte de expectativa formulada por Hans Robert Jauss e da concepção de que o tradutor, além de mediador entre línguas e culturas, é também um autor cujo trabalho envolve elementos intuitivos e criativos. A exposição do projeto tradutório busca manifestar a posição tradutiva e o horizonte do tradutor, salientando a responsabilidade crítica envolvida no ato tradutório. A tradução estrangeirizante é aqui definida como tradução desviante de preconcepções correntes acerca da cultura-fonte e da literatura-fonte no contexto de recepção, de modo que a tática de tradução estrangeirizante coloca-se como uma estratégia de ação crítica na recepção de uma literatura estrangeira.Abstract : The thesis contains the complete translation into Portuguese of Brennu-Njáls saga (Njal?s saga), an anonymous Icelandic work from the second half of the 13th century and considered to be the most important of the sagas of Icelanders (Íslendingasögur) and one of the landmarks of Medieval Scandinavian Literature. It beggins with a general presentation of the work and its literary context, pointing out some relevant aspects of its modern reception, and then proposes a foreignizing translation, making use of Lawrence Venuti?s and Antoine Berman?s ideas. This translation aims, through the choice of the source-text and translation strategies, to deviate from some observable tendencies in the reception context for the translation. Thus, the translation employs the notion of ?horizon of expectation? formulated by Hans Robert Jauss. It also suggests that a translator, besides being a mediator between languages and cultures, is also an author whose work involves creative and intuitive elements. The exposition of the translation project aims to manifest the translator?s position and the translator?s horizon, pointing out the critical responsibility involved in the act of translating. Foreignizing translation is here defined as a translation that deviates from current preconceptions about the source-culture and the source-literature within the reception context, so that the tactics of the foreignizing translation may be seen as a critical action in the reception of a foreign literature
