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    Wyświetlanie 1-4 z 4
    Tytuł:
    First-principle study of structural, elastic anisotropic, and thermodynamic properties of P4̅m2-BC₇
    Autorzy:
    Zhang, Quan
    Wei, Qun
    Yan, Haiyan
    Zhang, Zixia
    Fan, Qingyang
    Jia, Xiaofei
    Zhang, Junqin
    Zhang, Dongyun
    Powiązania:
    https://bibliotekanauki.pl/articles/1070533.pdf
    Data publikacji:
    2016-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    65.40.De
    62.20.de
    Opis:
    The structural, elastic anisotropy and thermodynamic properties of the P4̅m2-BC₇ are investigated using first-principles density functional calculations and the quasi-harmonic Debye model. The obtained structural parameters and elastic modulus are in consistency with the available theoretical data. Elastic constants calculations show that P4̅m2-BC₇ is elastic anisotropic. The bulk modulus as well as other thermodynamic quantities of P4̅m2-BC₇ (including the Grüneisen constant, heat capacity and thermal expansion) on temperatures and pressures have also been obtained.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 3; 329-333
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Color image encryption scheme based on quaternion discrete multi-fractional random transform and compressive sensing
    Autorzy:
    Ye, Huo-Sheng
    Dai, Jing-Yi
    Wen, Shun-Xi
    Gong, Li-Hua
    Zhang, Wen-Quan
    Powiązania:
    https://bibliotekanauki.pl/articles/2033985.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    color image encryption
    quaternion discrete multi-fractional random transform
    compressive sensing
    confusion-diffusion strategy
    Opis:
    A color image compression-encryption algorithm by combining quaternion discrete multi-fractional random transform with compressive sensing is investigated, in which the chaos-based fractional orders greatly improve key sensitivity. The original color image is compressed and encrypted with the assistance of compressive sensing, in which the partial Hadamard matrix adopted as a measurement matrix is constructed by iterating Chebyshev map instead of utilizing the entire Guassian matrix as a key. The sparse images are divided into 12 sub-images and then represented as three quaternion signals, which are modulated by the quaternion discrete multi-fractional random transform. The image blocking and the quaternion representation make the proposed cryptosystem avoid additional data extension existing in many transform-based methods. To further improve the level of security, the plaintext-related key streams generated by the 2D logistic-sine-coupling map are adopted to diffuse and confuse the intermediate results simultaneously. Consequently, the final ciphertext image is attained. Simulation results reveal that the proposed cryptosystem is feasible with high security and has strong robustness against various attacks.
    Źródło:
    Optica Applicata; 2021, 51, 3; 349-364
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Different Plant Monocultures on Nitrogen Removal Performance in Wetland Microcosms
    Autorzy:
    Wang, Rujun
    Quan, Ying
    Zheng, ShaoKui
    Zhang, Xueyu
    Powiązania:
    https://bibliotekanauki.pl/articles/2173379.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ammonia
    constructed wetland
    free-water surface
    nitrate
    optimization mechanism
    Opis:
    This study investigated the nitrogen removal performance in wetland microcosms individually planted with different plant monocultures, including emergent, free-floating and submerged plants during ammonia removals, or large- and small-leaf free-floating plants during nitrate removal. For ammonia-dominated wastewater, both emergent (common reed) and free-floating (water hyacinth) plants in wetland microcosms achieved higher total nitrogen removals than a submerged plant (eelgrass) that significantly improved the microbial nitrifying performance. For nitrate-dominated wastewater, efficient nitrate removals in wetland microcosms planted with free-floating plant were achieved by both a full cover of water surface and the concentration of organic oxygen-consuming substances, which resulted in low dissolved oxygen levels and boosted microbial denitrification in wetland microcosms. FWS-CW developers and managers should thus pay close attention to the selection of wetland plant types and optimize their design to achieve optimum nitrogen removal performance.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 9; 241--249
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical Descriptions of Dynamic Softening Mechanisms for Ti-13Nb-13Zr Biomedical Alloy in Single Phase and Two Phase Regions
    Autorzy:
    Quan, G.-Z.
    Wang, X.
    Li, Y.-L.
    Zhang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/353917.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomedical titanium alloy
    flow stress
    dynamic recovery
    dynamic recrystallization
    dynamic softening
    Opis:
    Dynamic softening behaviors of a promising biomedical Ti-13Nb-13Zr alloy under hot deformation conditions across dual phase α + β and single phase β regions were quantitatively characterized by establishing corresponding dynamic recovery (DRV) and dynamic recrystallization (DRX) kinetic models. A series of wide range hot compression tests on a Gleeble-3500 thermo-mechanical physical simulator were implemented under the strain rate range of 0.01-10 s−1 and the temperature range of 923-1173 K. The apparent differences of flow stress curves obtained in dual phase α + β and single phase β regions were analyzed in term of different dependence of flow stress to temperature and strain rate and different microstructural evolutions. Two typical softening mechanisms about DRV and DRX were identified through the variations of a series of stress-strain curves acquired from these compression tests. DRX is the dominant softening mechanism in dual phase α + β range, while DRV is the main softening mechanism in single phase β range. The DRV kinetic model for single phase β region and the DRX kinetic model for dual phase α + β region were established respectively. In addition, the microstructures of the compressed specimens were observed validating the softening mechanisms accordingly.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2029-2043
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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