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    Wyświetlanie 1-5 z 5
    Tytuł:
    Tsallis Entropies of Superposition States οf Two Photon-Subtracted SU(1,1) Coherent States and Entanglement Transfer to Qubits
    Autorzy:
    Liang, Mai-Lin
    Yuan, Bing
    Zhang, Jia-Nan
    Powiązania:
    https://bibliotekanauki.pl/articles/1584983.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Dv
    03.65.Ud
    05.70.-a
    Opis:
    Entropy properties of the superposed photon-subtracted two-mode coherent states are quite different from that of the single state. Tsallis entropies of the superposed states have extreme values, while that of the single state change monotonously. Further, it is found that the positions of the maxima of the entropies are independent of the entropic index. Around the maxima of the entropies, the entanglement transfer from the superposed states to two initially separable qubits is nearly complete.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 6; 1006-1010
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flexible system for micro-clinching processes design and analysis
    Elastyczny system do projektowania i analizy procesów mikro-klinczowania
    Autorzy:
    Presz, Wojciech
    Bing-Yuan, Han
    Powiązania:
    https://bibliotekanauki.pl/articles/115161.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mikro-łączenie
    mikro-klinczowanie
    mikro-oprzyrządowanie elastyczne
    modelowanie procesów
    micro-joining
    micro-clinching
    flexible micro-tooling
    process modelling
    Opis:
    With the development of microprocessors, actuators and structural micro-components, new concepts of micro-electro-mechanical systems/machines are constantly being introduced. One of the consequences of this tendency is seeking for best techniques to connect metal micro-components. Because of tools simplicity, no additional fastening parts and the undisturbed structure of the material, clinching appears to be a promising method for joining in micro-scale. A procedure for the analysis of micro-clinching process is proposed in the paper, and unique, support flexible tooling system designed. This system allows to easily change key parameters of the process. With the use of flexible micro-tooling, a successful micro-clinching of silver sheets of thickness 0.18 mm has been conducted. An effective numerical method - Rapid Numerical Strength Test - for modelling the process of tearing the joints has been presented. Compliance of key phenomena recognized in modelling with experimental results was obtained.
    Wraz z rozwojem mikroprocesorów, siłowników i mikroskładników strukturalnych stale wprowadzane są nowe koncepcje systemów/maszyn mikroelektromechanicznych. Jedną z konsekwencji tej tendencji jest poszukiwanie najlepszych technik łączenia mikrokomponentów metalowych. Biorąc pod uwagę prostotę narzędzi, brak dodatkowych elementów mocujących i niezakłóconą strukturę materiału, klinczowanie wydaje się być obiecującą metodą łączenia w mikroskali. W artykule zaproponowano procedurę analizy procesu mikro-klinczowania oraz zaprojektowano unikalny, wspierający elastyczny system narzędziowy. System ten pozwala na łatwą zmianę kluczowych parametrów procesu. Dzięki zastosowaniu elastycznego mikro-oprzyrządowania przeprowadzono udane mikro-klinczowanie blach srebrnych o grubości 0,18 mm. Przedstawiono skuteczną metodę numeryczną - Rapid Numerical Strength Test - do modelowania procesu rozrywania złączy. Uzyskano zgodność kluczowych zjawisk rozpoznanych w modelowaniu z wynikami eksperymentalnymi.
    Źródło:
    Welding Technology Review; 2020, 92, 4; 31-45
    0033-2364
    2449-7959
    Pojawia się w:
    Welding Technology Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Ultrasonic Vibration on the Solidification of 35CrMo Steel
    Autorzy:
    Zheng-Bing, X.
    Yuan-Chun, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/352200.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrasonic vibration
    solidification
    segregation
    defects
    Opis:
    The effect of ultrasonic vibration on the microstructure, elimination of casting defects and distribution of alloyed elements at macro-scale during solidification of 35CrMo steel has been investigated. Results show that ultrasonic treatment has a significant effect on the grain refinement, especially the fragmentation of the secondary dendritic arms of the studied steel. Density of the casting defects decreases and the alloyed elements are seen more even distribution at macro-scale with the introduction of ultrasonic vibration. Meanwhile, the ultrasonic vibration works more efficiently in the longitudinal direction than in the radial, and its efficiency declines with the distance from the radiator increasing.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 293-298
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of digital transformation and MSMEs performance from a spatial perspective: Evidence from China
    Autorzy:
    Zheng, Bing
    Yuan, Yuqing
    Li, Huizhuan
    Jiang, Yihan
    Powiązania:
    https://bibliotekanauki.pl/articles/18721474.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    digital transformation
    double sampling frame
    performance analysis
    MSMEs
    Opis:
    Aim/purpose – Not only have micro, small, and medium enterprises (MSMEs) been regarded as a driving force of the national economy, but they have also become important in promoting innovation and entrepreneurship. In general, today’s MSMEs face problems, such as high business costs, insufficient innovation, and inadequate management capabilities, that have all forced the digital transformation of MSMEs. However, in existing studies, the impact of digital transformation on performance is controversial, and the subjects are generally listed companies. In this paper, we have decided to use micro business survey data and analyze them from a spatial perspective to explore how MSMEs’ digital transformation plays a role in influencing performance and the path of its effect. Design/methodology/approach – We use a sampling method with a dual directory-regional sampling frame to investigate MSMEs in Ningbo City, Zhejiang Province, China and then delve into the impact of digital transformation on enterprise performance from a spatial perspective by the spatial weighted logit model. Findings – Hierarchical analysis shows that there is a large room for improvement in the Digital transformation of enterprises. The digitalization level of an enterprise has a positive impact on performance. While from a spatial perspective, the digitalization level of neighboring enterprises has a negative impact on the performance of the enterprise. Path analysis shows that the digital transformation of enterprises can increase innovation, reduce costs, and improve the performance of enterprises. Originality/value – We provide an empirical basis for vigorously promoting the digital transformation of enterprises, jointly building digital parks, and improving enterprise performance by reducing costs and improving efficiency. At the same time, it provides relevant suggestions for digital transformation for manufacturing MSMEs that are hesitant to see or are at a loss in the digital transformation and helps manufacturing MSMEs to achieve cost reduction and increase efficiency.
    Źródło:
    Journal of Economics and Management; 2023, 45; 319-343
    1732-1948
    Pojawia się w:
    Journal of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of the cranial musculature of the paraceratheriid rhinocerotoid Pappaceras meiomenus and inferences of its feeding and chewing habits
    Autorzy:
    Wang, Hai-Bing
    Bai, Bin
    Gong, Yan-Xin
    Meng, Jin
    Wang, Yuan-Qing
    Powiązania:
    https://bibliotekanauki.pl/articles/945214.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    mammalia
    perissodactyla
    paraceratheriidae
    pappaceras meiomenus
    chewing
    eocene
    china
    Opis:
    The paraceratheriid Pappaceras is the earliest unequivocal rhinocerotoid genus to date, for which the osteological morphology is relatively unique compared to other perissodactyls. Due to the poor preservation condition, paleobiological aspects of Pappaceras (or forstercooperiines), such as chewing and feeding behavior, still remain unknown. Under the Extant Phylogenetic Bracket, the cranial musculature of the newly erected Pappaceras meiomenus has been reconstructed using two-dimensional illustrations, drawings and interpretations of the position and general morphology of cranial muscles for which origins and insertions on the skull are visible. In this study, eight muscles are reconstructed, described and compared to the corresponding muscles known or inferred in other perissodactyls, including the m. levator nasolabialis, the m. levator labii superior, the m. caninus, the m. zygomaticus, the m. masseter, the m. temporalis, the m. buccinator and the m. pterygoid. The reconstruction of the masticatory muscles suggests that Pappaceras meiomenus is strictly herbivorous, probably folivorous, with a primary component of vertical biting. The relatively well-developed m. pterygoid (particularly the m. pterygoideus medialis) indicates that Pappaceras meiomenus is similar to hyracodontids, having more advantages in rotary chewing than other non hyracodontid rhinocerotoids. The configuration of basicranial features shows differentiation between non-hyracodontids and hyracodontids, demonstrating that the well-developed, specialized postglenoid process and the wide glenoid fossa, along with the postcotyloid process of the mandible, serve as a strong fulcrum during the power stroke in non-hyracodontids. Based on its rostral morphology, we suggest that Pappaceras meiomenus was a general browser. The morphology of its incisors and canines further indicate the ability to feed on hard plants, using the postulated puncture-crushing and grinding function.
    Źródło:
    Acta Palaeontologica Polonica; 2017, 62, 2; 259-271
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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