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    Wyświetlanie 1-5 z 5
    Tytuł:
    Credential revocation in the RT Framework
    Autorzy:
    Pikulski, W.
    Sacha, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/115578.pdf
    Data publikacji:
    2013
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    Software security
    trust management
    credential revocation
    RT Framework
    nonmonotonicity
    credential chain
    credential graph
    freshness constraints
    freshness graph
    Opis:
    The paper is focused on nonmonotonicity in trust management models which provide access control mechanisms for distributed systems. The work explains what decentralised systems are, defines a notion of security model nonmonotonicity, presents its types and points out factors that causes trust management model to become nonmonotonic. A result of this analysis is a model for credential revocation in the RT Framework trust management model. When security model allows for credential revocation, it becomes nonmonotonic. Presented model allows to turn it to be temporally monotonic. It allows policy authors to define constraints for roles, and applies those values to credentials. When credential does not comply to defined requirements, it is disregarded. A model is evaluated against sample scenario, which demonstrates how it can be applied to real-life use cases.
    Źródło:
    Challenges of Modern Technology; 2013, 4, 3; 16-22
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Freshness of Mackerel (Rastrelliger kanagurta (Cuvier, 1816)) at Rancaekek Market, Resik Market, and Tanjungsari Market
    Autorzy:
    Hakim, Ghifar
    Junianto, Junianto
    Liviawaty, Evi
    Hasan, Zahidah
    Powiązania:
    https://bibliotekanauki.pl/articles/1158254.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Freshness
    Mackerel
    Rancaekek market
    Rastrelliger kanagurta
    Resik market
    Tanjungsari market
    Opis:
    This research aims to know the level of freshness of mackerel (Rastrelliger kanagurta (Cuvier, 1816)) contained in Rancaekek market, Resik market, and Tanjungsari market. Methods of the research was survey methods and the level of freshness of the sample using organoleptic test. The samples were observed organoleptically including the appearance of the eyes, gill appearance, mucus appearance, meat condition, aroma, and texture. Based on observations on the freshness of mackerel from the parameters of eye appearance, gill appearance, mucus condition, meat condition, aroma, and texture, it can be concluded that the fish marketed by Rancaekek market scored 7.1, which means that it is in the fresh category, fish marketed in the Resik market got a score of 7.4, which means it is in the fresh category, and the fish marketed by the Tanjungsari market gets a score of 6.9, which means that it is within the fresh limit.
    Źródło:
    World Scientific News; 2018, 114; 1-14
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of poultry eggs freshness using FTIR spectroscopy combined with HCA and PCA methods
    Autorzy:
    Michalczyk, E.
    Kurczab, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/93132.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    egg freshness
    FTIR spectroscopy
    chemometrics
    świeżość jaja
    spektroskopia FTIR
    chemometria
    Opis:
    The main aim of this study was to investigate the use of Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR FTIR) and selected chemometric methods to classify eggs in terms of the laying hen farming method, as well as to identify changes in the individual egg compositions during storage. In total, 50 eggs were used for the study; 10 eggs per classes: 0, 1, 2, 3 and rural. Eggs were stored by 29 days period, which was divided on the 10 measuring days in which one egg from each class was tested by recording two FTIR spectra for the shell, albumen and egg yolk. The chemometric analysis, including Hierarchical Cluster Analysis (HCA) and the Principal Component Analysis (PCA), was performed based on the recorded FTIR spectra. Changes in chemical composition during the experiment in individual egg elements were analyzed. Furthermore, by analyzing the graphs (HCA and PCA) obtained by the chemometric analysis, it was noted that the largest changes in the chemical composition of eggs occurred in the shell and yolk, while in the albumen it was less insignificant. The chemometric analysis of the recorded spectra also showed that combination of chemometric methods and FTIR spectroscopy can potentially be used to develop a non-destructive method for classifying eggs in terms of the hen culture method and to monitor of their freshness.
    Źródło:
    Science, Technology and Innovation; 2018, 2, 1; 7-12
    2544-9125
    Pojawia się w:
    Science, Technology and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intelligent food packaging - research and development
    Inteligentne opakowania - badania i rozwój
    Autorzy:
    Dobrucka, R.
    Cierpiszewski, R.
    Korzeniowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/362192.pdf
    Data publikacji:
    2015
    Wydawca:
    Wyższa Szkoła Logistyki
    Tematy:
    intelligent packaging
    time-temperature indicators
    freshness indicator
    opakowanie inteligentne
    wskaźnik temperatury
    wskaźnik świeżości
    Opis:
    Packaging also fosters effective marketing of the food through distribution and sale channels. It is of the utmost importance to optimize the protection of the food, a great quality and appearance - better than typical packaged foods. In recent years, intelligent packaging became very popular. Intelligent packaging is becoming more and more widely used for food products. Application of this type of solution contributes to improvement of the quality consumer life undoubtedly. Intelligent packaging refers to a package that can sense environmental changes, and in turn, informs the users about the changes. These packaging systems contain devices that are capable of sensing and providing information about the functions and properties of the packaged foods. Also, this paper will review intelligent packaging technologies and describe different types of indicators (time-temperature indicators, freshness indicators).
    Opakowania umożliwiają efektywny marketing żywności przy zastosowaniu różnych kanałów sprzedaży i dystrybucji. Najważniejszym zadaniem jest optymalizacja ochrony żywności, jej jakości i wyglądu. W przeciągu ostatnich lat, wzrasta popularność opakowań inteligentnych, które zaczynają być stosowane dla coraz to większej liczby produktów żywnościowych. Zastosowania ich przyczyniają się do poprawy życia konsumenta. Określenie "opakowania inteligentne" stosuje się do opakowań wyczuwających zmiany w otoczeniu oraz będących w stanie informować o tych zmianach. Systemy opakowaniowe zawierają w sobie urządzenia wykrywające i dostarczające informacji dotyczących stanu zapakowanej żywności. Praca ta dokonuje przeglądu technologii opakowań inteligentnych oraz opisuje różnego rodzaju wskaźniki (temperatury, czasu i świeżości).
    Źródło:
    LogForum; 2015, 11, 1; 7-14
    1734-459X
    Pojawia się w:
    LogForum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of modified atmosphere packaging on the course of physical and chemical changes in chilled muscle tissue of silver carp (Hypophthalmichthys molitrix, V.)
    Autorzy:
    Jezek, F.
    Buchtova, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/31515.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    modified atmosphere packaging
    physical change
    chemical change
    chilled muscle
    muscle tissue
    silver carp
    Hypophthalmichthys molitrix
    freshwater fish
    fish
    meat oxidation
    freshness
    oxidative process
    Opis:
    The effect of two types of modified atmosphere (MA1: 69% N2, 25% CO2, 5%O2, 1% CO; MA2: 70% N2, 30% CO2) on changes in physical and chemical parameters (pH, aw - water activity, TVBN - total volatile basic nitrogen, TMA - trimethylamine, FFA - free fatty acids, PV - peroxide value, TBA - thiobarbituric acid) in muscle tissues of the silver carp was monitored in the study. The samples were stored at temperatures +2 ± 2oC for 18 days. Changes in gas volumes (CO2 and O2) in MAs were also monitored. CO2 levels increased in MA1 but decreased in MA2. At the end of 18 days of storage, a significantly (P < 0.01) lower water activity (aw) levels were found in samples packaged under MA1, in contrast to samples packaged under MA2 where water activity values showed considerable fluctuation. Variations in pH values in the two types of MA showed similar trends. Sample pH gradually decreased until day 9 of storage. On day 11, muscle tissue pH increased markedly and then began to decrease again. The overall decrease in pH values was more profound in samples packaged under MA1. TVBN and TMA levels in samples packaged under the two types of MAs remained almost identical until day 9 of the experiment. Later, however, significantly (P < 0.01) higher levels of both parameters were found in muscle tissues packaged under MA1. FFA concentrations in silver carp samples in MA1 were significantly lower (P < 0.01) throughout the experiment. The PV increased significantly in both muscle samples tested. Greater fluctuations in this parameter’s values throughout the experiment were observed in samples packaged under MA2. Faster rates of oxidation (P < 0.01) were found in samples packaged under MA1 starting on day 9. Maximum TBA values in MA1 and MA2 were observed on days 14 and 18 of the experiment, respectively. From the course of proteolytic and oxidative changes point of view, the more appropriate combination of gases for silver carp storage seems to be the mixture of 70% N2 and 30% CO2 (MA2), which allows for muscle storage of up to 9 days. We recommend TVBN as a suitable indicator of freshness, and TBA assay as a suitable indicator of the extent of oxidative processes.
    Źródło:
    Polish Journal of Veterinary Sciences; 2012, 15, 3
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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