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    Wyświetlanie 1-83 z 83
    Tytuł:
    Badanie jakości wydruku elementów wykonanych techniką DLP przy wykorzystaniu tomografii wiązki stożkowej oraz tomografii konwencjonalnej
    Print quality test of elements made by DLP printing technique using cone beam ct and conventional CT
    Autorzy:
    Redutko, Joanna
    Szarek, Arkadiusz
    Wrona, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2201480.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    druk 3D
    DLP
    tomografia wolumetryczna
    CBCT
    CT
    3D printing
    volumetric tomography
    Opis:
    Artykuł zawiera ocenę jakości wydruku elementów wykonanych w technice druku DLP, poprzez analizę projekcji otrzymanych z tomografu wolumetrycznego i konwencjonalnego. Podczas analizy określono czy możliwym jest wykonanie fantomu do CBCT z wydruku światłoutwardzalnego przy pomocy drukarki DLP. Badania tomograficzne miały na celu określenie obecności wtrąceń materiałowych i pęcherzy powietrza, mogących dawać efekt odbicia promieni rentgenowskich. Przeanalizowano ilość pochłanianej wiązki promieniowania poprzez pomiary wartości jednostek Hounsfielda dla wielu obszarów próbek.
    The article has been devoted to an evaluation of the print quality of elements made in the DLP printing technique, which was obtained as a result of the analysis of the projection from the volumetric and conventional CT. During this analysis the presence of air bubbles, material inclusions and other artifacts, which may give the effect of X-ray reflection, was determined. The amount of absorbed radiation beam was also analysed by measuring the Hounsfield unit values for many sample areas.
    Źródło:
    Aktualne Problemy Biomechaniki; 2019, 17; 101--109
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards an Auditable Cryptographic Access Control to High-value Sensitive Data
    Autorzy:
    Kanciak, Krzysztof
    Wrona, Konrad
    Powiązania:
    https://bibliotekanauki.pl/articles/227097.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    identity-based encryption
    GDPR
    Opis:
    We discuss the challenge of achieving an auditable key management for cryptographic access control to high-value sensitive data. In such settings it is important to be able to audit the key management process - and in particular to be able to provide verifiable proofs of key generation. The auditable key management has several possible use cases in both civilian and military world. In particular, the new regulations for protection of sensitive personal data, such as GDPR, introduce strict requirements for handling of personal data and apply a very restrictive definition of what can be considered a personal data. Cryptographic access control for personal data has a potential to become extremely important for preserving industrial ability to innovate, while protecting subject’s privacy, especially in the context of widely deployed modern monitoring, tracking and profiling capabilities, that are used by both governmental institutions and high-tech companies. However, in general, an encrypted data is still considered as personal under GDPR and therefore cannot be, e.g., stored or processed in a public cloud or distributed ledger. In our work we propose an identity-based cryptographic framework that ensures confidentiality, availability, integrity of data while potentially remaining compliant with the GDPR framework.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 3; 449-458
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rok w Czterdziestej Eskadrze
    Autorzy:
    Sałata, Dariusz.
    Sałata, Krzysztof.
    Wrona, Andrzej.
    Powiązania:
    Skrzydlata Polska 2007, nr 12, s. 26-28
    Data publikacji:
    2007
    Tematy:
    40 Eskadra Lotnictwa Taktycznego (Świdwin) nadanie sztandaru uroczystości
    Nadanie sztandaru
    Baza lotnicza nadanie sztandaru uroczystości
    Siły powietrzne jednostki
    Opis:
    Uroczystość wręczenia sztandaru (40) Eskadrze Lotnictwa Taktycznego.
    Fot.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    FXLMS with Multiple Error Switching for Active Noise-Cancelling Casings
    Autorzy:
    Mazur, Krzysztof
    Wrona, Stanislaw
    Chraponska, Anna
    Rzepecki, Jaroslaw
    Pawelczyk, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/176371.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    active noise control
    adaptive control
    active casing
    Opis:
    Passive noise reduction methods require thick and heavy barriers to be effective for low frequencies and those clasical ones are thus not suitable for reduction of low frequency noise generated by devices. Active noise-cancelling casings, where casing walls vibrations are actively controlled, are an interesting alternative that can provide much higher low-frequency noise reduction. Such systems, compared to classical ANC systems, can provide not only local, but also global noise reduction, which is highly expected for most applications. For effective control of casing vibrations a large number of actuators is required. Additionally, a high number of error sensors, usually microphones that measure noise emission from the device, is also required. All actuators have an effect on all error sensors, and the control system must take into account all paths, from each actuator to each error sensor. The Multiple Error FXLMS has very high computational requirements. To reduce it a Switched-Error FXLMS, where only one error signal is used at the given time, have been proposed. This, however, significantly reduces convergence rate. In this paper an algorithm that uses multiple errors at once, but not all, is proposed. The performance of various algorithm variants is compared using simulations with the models obtained from real active-noise cancelling casing.
    Źródło:
    Archives of Acoustics; 2019, 44, 4; 775-782
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Double-Panel Structure Modification on Vibroacoustical Properties of a Rigid Device Casing
    Autorzy:
    Chrapońska, Anna
    Rzepecki, Jarosław
    Mazur, Krzysztof
    Wrona, Stanisław
    Pawełczyk, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/176468.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    noise control
    vibration control
    double-panel structures
    active casing
    natural frequencies
    modeshapes
    Opis:
    Nowadays, noise generated by devices is a serious issue in industry and in everyday life, because it may cause health damage to humans. In this research, a cubic rigid device casing built of double-panel thin steel walls is employed to reduce noise emitted from an enclosed noise source. Double-panel structure is used because of good sound insulation it provides. There exist three main groups of noise reduction methods, i.e. passive, semi-active and active. In this paper, a semi-active modification of double-panel structure is applied and examined. The bistable actuator (solenoid) mounted between incident and radiating plates changes its state due to applied constant voltage, causing the coupling of plates. Experimentally measured natural frequencies and modeshapes of the structure are compared to the simulation results. The influence of proposed modification on dynamical properties of the structure is analyzed and discussed.
    Źródło:
    Archives of Acoustics; 2020, 45, 1; 119-127
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sound Transmission Through a Thin Plate with Shaped Frequency Response
    Autorzy:
    Wrona, Stanislaw
    Mazur, Krzysztof
    Rzepecki, Jaroslaw
    Chraponska, Anna
    Pawelczyk, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/177996.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    structural control
    frequency response shaping
    vibrating plate
    optimisation
    modelling
    Opis:
    Thin plates, in the form of individual panels or whole device casings, often separate the noise source from its recipients. It would be very desirable if the panels could effectively block the sound transmission preventing noise from further propagation. This is especially challenging to achieve at low frequencies. A promising approach, intensively developed in the recent years, is to employ active control methods by adding sensors and actuators, and running a control algorithm. However, if the noise is narrow-band, an alternative passive solution originally developed by the authors can be applied. It is based on appropriately located passive elements which can be used to alter the frequency response of the vibrating structure thus improving its sound insulation properties. Such an approach is referred to as the frequency response shaping method. The purpose of this paper is to further develop this method and apply it to a device casing panel. The efficiency of the method is evaluated by simulation and real experiments. Appropriate cost functions and mathematical models are formulated and used to optimise the arrangement of passive elements mounted to the plate, enhancing its sound insulation properties at the given frequency range. The results are reported, and advantages and limits of the method are pointed out and discussed.
    Źródło:
    Archives of Acoustics; 2019, 44, 4; 731-738
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biopolymer compositions for ecological protection and growth stimulation of plants
    Autorzy:
    Niekraszewicz, Antoni
    Wiśniewska-Wrona, Maria
    Kopania, Ewa
    Orlikowski, Leszek
    Pospieszny, Henryk
    Krawczyk, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1035390.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    biopolymer compositions
    growth stimulation.
    plant protection
    polysaccharides
    Opis:
    Presented herein are investigations in the preparation of an advanced , human-and environmentfriendly plant protection composition based on selected bioactive biopolymers of the polysaccharide family. In the Institute of Biopolymers and Chemical Fibres the biopolymers were prepared and the biological activity of chitosan in the form of salt and gel and of hemicelluloses (galactoglucomannans) and of their compositions was tentatively evaluated by way of plate tests. Estimated was the impact of such preparations upon the stimulation of the germination rate of radish seeds at concentration of 0.1, 0.01 and 0.005% after 72 hours. The efficacy of the preparations was evaluated based on the number of germinated seeds in the green mass of the sprouts and their length in comparison to a reference in water at pH = 7.0. In Research Institute of Horticulture, Skierniewice, Poland the usefulness of selected iopolymer preparations was evaluated as agents to protect decorative plants against some pathogens (on leaves, in soil) such as Phytophtora cryptogea causing decay of shoots and roots. It could be found that the biopolymer compositions applied to the soil provided a much better rooting of chrysanthemum cuttings in a Phytophtora cryptogea - infected soil. The cuttings were growing much faster and the number of infected ones was largely reduced. The usefulness of a number of chitosan formulations was also evaluated for seed pickling. It was found that the formulations exerted a distinctly positive impact upon the germination, growth and health of the seedlings. Laboratory and greenhouse testing was made in the Institute of Plant Protection, Poznań, Poland where the biological activity of some biopolymer compositions was evaluated. A first selection of the biopolymers was done based on an in vitro examination of the impact upon bacteria growth. (Gram negative - Erwinia amylovora and Gram positive Clavibacter ichiganensis ) on agar or agarose plates and upon the generation of necrotic stains on beans and tobacco caused by lucerne mosaic virus and tobacco mosaic virus respectively. It was found that the preparations with original biopolymer concentration had not affected the viruses directly but stimulated the plants’ immunity against the pathogens.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 149-162
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-83 z 83

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