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    Wyświetlanie 1-7 z 7
    Tytuł:
    Prospects for using wastewater from a farm for algae cultivation: The case of Eastern Colombia
    Autorzy:
    Urbina-Suarez, Nestor Andres
    Barajas-Solano, Andres Fernando
    Garcia-Martinez, Janet Bibiana
    Lopez-Barrera, German Luciano
    González-Delgado, Angel Dario
    Powiązania:
    https://bibliotekanauki.pl/articles/2073734.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    biological treatment
    characterisation
    microalgae
    monitoring
    nutrient wastewater
    Opis:
    In recent years, the technical and economic feasibility of using microalgae and cyanobacteria has been explored for the removal and exploitation of domestic, agricultural and industrial residual effluents with high C, N and P compounds content. To contribute to the understanding of the process and its technical viability for microalgae growth, the article discusses monitoring, flow determination, and physicochemical characteristics of two types of effluents generated in an experimental farm located in the east of Colombia, before (R1) and after biological treatment (R2). In general, the results showed the reduction of different parameters, such as total dissolved solids (TDS), hardness, salinity and phosphates after treatment with activated sludge. However, the conductivity value obtained in R1 and R2 showed the presence of a pollutant load. These findings can be attributed to the highest concentration of fats and oils in the water during early hours of the day. Finally, although the concentration of nitrates increased from 46.63 to 225.21 mg∙dm-3 and phosphate decreased slightly from 9.65 to 6.21 mg∙dm-3,no inhibition was generated in the microalgae, as evidenced in the growth of the microalgal biomass in effluents after nitrate and phosphate removal above 80%.
    Źródło:
    Journal of Water and Land Development; 2022, 52; 172--179
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A model for intelligent protection of critical computer systems
    Autorzy:
    Gonzalez, Fernando
    Rusinkiewicz, Marek
    Zalewski, Janusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1954577.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska
    Tematy:
    computer safety
    computer security
    critical systems
    intelligent systems
    safety security modeling
    bezpieczeństwo komputera
    systemy krytyczne
    systemy inteligentne
    bezpieczeństwo
    modelowanie bezpieczeństwa
    Opis:
    We propose a unified model for the enforcement of safety and security of cyber-physical systems in critical applications. We argue that the need for resilience of a critical system requires simultaneous protection from hazards (safety) and from unauthorized access (security). We review how the critical system properties are handled and present a framework for their modeling. Then we present a model for the enforcement of critical system properties through situational awareness, including threat monitoring, data analysis and state prediction for decision making. We conclude by presenting a case study of a power grid simulation and advocate the ability to move from today's reactive approaches to proactive ones that aim at avoiding system failures.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2021, 25, 3; 279-294
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cultivation of Chlorella sp. for biodiesel production using two farming wastewaters in eastern Colombia
    Autorzy:
    Urbina-Suarez, Nestor Andres
    Barajas-Solano, Andres Fernando
    Garcia-Martinez, Janet Bibiana
    Lopez-Barrera, German Luciano
    Gonzalez-Delgado, Angel Darío
    Powiązania:
    https://bibliotekanauki.pl/articles/1841977.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    biofuel
    Chlorella
    lipids
    microalgae
    wastewater
    Opis:
    The production of biofuels using wastewater as a microalgae culture medium is a little explored technology, but with potential for success. In order to contribute to the knowledge of these technologies and their technical feasibility for microalgae growth, in this work the Chlorella sp. strain was cultivated in two types of effluents generated in an experimental farm located in eastern Colombia, before and after a biological treatment process. The consumption of the main nutrients that regulate growth and lipid production was evaluated, in order to extract, quantify, characterize and convert them into biodiesel. The results showed that Chlorella sp. growth and lipid production is more favourable in R2 medium of treated water than in R1 medium of raw water, mainly due to phosphorus limitation and higher N-NO3 concentration in R2 compared to R1. In the R2 medium culture, a percentage of 42.54% of long-chain fatty acids was found, which is necessary to obtain a high quality biodiesel. Finally, the best transesterification experiment allowed reaching a fatty acid methyl esters (FAME) percentage of 90.1 ± 2.7%. In general, the results demonstrated the potential viability of using the wastewater generated in the San Pablo farm to produce biomass with lipid content to obtain biodiesel, finding that where the concentration of nutrients, mainly nitrogen, has a great influence on the microalgal metabolism for lipid accumulation.
    Źródło:
    Journal of Water and Land Development; 2021, 50; 141-149
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimized Extraction, Microencapsulation, and Stability of Anthocyanins from Ardisia compressa K. Fruit
    Autorzy:
    Antonio-Gomez, Maria V.
    Salinas-Moreno, Yolanda
    Hernández-Rosas, Francisco
    Martínez-Bustos, Fernando
    Andrade-González, Isaac
    Herrera-Corredor, José A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1417206.pdf
    Data publikacji:
    2021-08-20
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    Ardisia compressa K
    tropical fruit
    microcapsules
    anthocyanins
    spray drying
    Opis:
    The fruit of Ardisia compresssa K. is called chagalapoli and has a high anthocyanin content, with a profile dominated by malvidin derivatives. The aims of this study were: a) to determine optimal conditions (ethanol concentration, pH, and sonication time) for anthocyanin extraction from chagalapoli fruit (CF) using response surface methodology, b) to perform spray-drying microencapsulation of the anthocyanins using mixtures of polysaccharides (maltodextrin – M and Capsul® – C) as wall materials, and c) to evaluate the stability of microcapsules during storage. Of the variables examined to optimize anthocyanin extraction from CF, only ethanol concentration and pH were significant in the model. The optimal extraction conditions were: 63.5% (v/v) ethanol, pH of 2.0, and sonication time of 30 min, which led to an anthocyanin content of 1545 mg malvidin 3-O-galactoside equivalents/100 g of fresh fruit. The proportion of M/C as the wall materials for microcapsule (MC) preparation did not affect the encapsulation efficiency and anthocyanin retention, but high hygroscopicity was observed in the MC with a high proportion of M. The half-life of the MC ranged from 423 to 519 days, and no effect of wall materials was observed. The color stability of the MC was enhanced by increasing C proportion in wall materials. The high stability of microencapsulated anthocyanins of chagalapoli fruit makes it a suitable option as a food colorant.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2021, 71, 3; 299-310
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal support design for galleries located in poor quality rock mass and under the influence of mining works
    Autorzy:
    Vazquez-Silva, Daniel
    Prendes-Gero, Maria-Belen
    Álvarez-Fernández, Martina-Inmaculada
    González-Nicieza, Celestino
    Laín-Huerta, Carlos
    López-Gayarre, Fernando
    Powiązania:
    https://bibliotekanauki.pl/articles/1853849.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton natryskowy
    śruba
    łuk stalowy
    support design
    back analysis
    numerical implementation
    bolt
    shotcrete
    yieldable steel arch
    Opis:
    In this work, the sup port of two general galleries located in poor quality rock mass and subjected to the influence of high thickness coal layer exploitations is designed and optimized. The process is carried out in four phases:A first preliminary support is defined employing different geomechanical classifications and applying the New Austrian Tunnelling Method (NATM) using bolts and shotcrete.An instrumentation campaign is carried out with the goal of analysing the behaviour of the support. The study noticed the failure of the support due to the time of placement of the different elements.A back-analysis using the Flac and Phases software has allowed the evaluation of the properties of the rock mass and the support, the study of the influence of the time of placement on the component elements (bolts and shotcrete), and the redefinition of that support.Subsequently, a new support is designed and optimized through numerical modeling after the start of mining without experience in these sizes of sublevel caving that caused the failure of the previously designed support. The new support is formed by yieldable steel arches that are more suitable to withstand the stresses generated by nearby mining work.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 4; 851-867
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Representativeness of Offensive Scenarios to Evaluate Perceptual-Cognitive Skills of Water Polo Players
    Autorzy:
    Casanova, Filipe
    Pereira, Ricardo
    Canossa, Sofia
    Padilha, Maickel
    Bagatin, Rafael
    Teoldo, Israel
    González-Víllora, Sixto
    Fernandes, Ricardo J.
    Tavares, Fernando
    Powiązania:
    https://bibliotekanauki.pl/articles/1030822.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    Attacking Game Scenarios
    Water Polo
    decision-making
    reliability
    Opis:
    The aim of this study was to trial several attacking offensive sequences as representative for further use in research on the perceptual-cognitive skills of water polo players. Elite water polo coaches were presented with separate test film sequences encompassing 80 structured water polo offensive plays. Each clip was approximately 6 s–7 s long with an inter-clip interval of 5 s–10 s, where a red dot was displayed on-screen at the start of the clip to indicate the area of first appearance of the ball. The order of presentation of the video clips was counterbalanced and randomly determined. The criteria were scored on a 5-point Likert-type scale. From the 80 clips presented, only 56 showed high agreement (W = 1; p < 0.05) and internal consistence reliability between the expert observers (α = 0.980; p < 0.05). Furthermore, a very high reproducibility (Z = 0; p = 1) was obtained between viewing sessions. The results obtained determine that 56 offensive scenarios were representative of the water polo game and as such may be useful in evaluating the perceptual-cognitive skills of the players.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2020, 29, 1; 11-19
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ergonomics: A Tool for the Liberation of Man
    Ergonomia: narzędzie wyzwolenia człowieka
    Autorzy:
    Casado, Fernando Gonzaléz
    Powiązania:
    https://bibliotekanauki.pl/articles/509852.pdf
    Data publikacji:
    2014
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II
    Tematy:
    humanism
    posthumanism
    transhumanism
    ergonomics
    human enhancement
    humanizm
    posthumanizm
    transhumanizm
    ergonomia
    Opis:
    Since the creation of the world, man has developed a series of activities that distinguish him from other living beings. Since antiquity, philosophers have pondered about what is man and his role in nature and in the world. My argument is based on the choice of ergonomics as an intermediate and better point in the framework of human enhancement.
    Od stworzenia świata, człowiek rozwinął szereg umiejętności, które odróżniają go od pozostałych żyjących istot. Od czasów starożytności filozofowie zastanawiali si ę nad rolą człowieka w świecie. Argumentacja przedstawiona w artykule bazuje na wyborze ergonomii jako lepszego i pośredniego modelu human enhacement.
    Źródło:
    Scripta Philosophica. Zeszyty Naukowe Doktorantów Wydziału Filozofii KUL; 2014, 3; 27-37
    2300-9357
    Pojawia się w:
    Scripta Philosophica. Zeszyty Naukowe Doktorantów Wydziału Filozofii KUL
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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