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Wyszukujesz frazę "Zhou, Jun" wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    On the second largest eigenvalue of a mixed graph
    Autorzy:
    Zhou, Jun
    Fan, Yi-Zheng
    Wang, Yi
    Powiązania:
    https://bibliotekanauki.pl/articles/743812.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    mixed graph
    Laplacian eigenvalue
    degree
    Opis:
    Let G be a mixed graph. We discuss the relation between the second largest eigenvalue λ₂(G) and the second largest degree d₂(G), and present a sufficient condition for λ₂(G) ≥ d₂(G).
    Źródło:
    Discussiones Mathematicae Graph Theory; 2007, 27, 2; 373-384
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of coupling effect between a unidirectional air waveguide and two cavities with one-way rotating state
    Autorzy:
    Gao, Yongfeng
    He, Liu
    Jiang, Zhen
    Zhou, Jun
    Shi, Yuejia
    Bai, Wenfang
    Powiązania:
    https://bibliotekanauki.pl/articles/174202.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    waveguide-cavity coupling
    magneto-optical photonic crystal
    unidirectional air waveguide
    one-way rotating state
    finite element method
    Opis:
    In the paper we present an implementation of resonance coupling between a unidirectional air waveguide and two cavities with one-way rotating state in a two-dimensional dielectric photonic crystal and a magneto-optical photonic crystal. We theoretically calculate the dispersion curves of the line defect waveguide and the dispersion curves of waveguide-cavity interaction, respectively. Numerical simulations show that, via waveguide-cavity coupling, a series of interesting resonance phenomena can be generated in the system. By modifying direction of the applied external magnetic field, storing and discharging of photonic energy can be realized. Our work may provide a practical and useful guidance for optical communications.
    Źródło:
    Optica Applicata; 2020, 50, 1; 49-59
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of flocculation performance and mechanism of ultrafine montmorillonite particles with NPAM
    Autorzy:
    Wang, Lujun
    Min, Fanfei
    Chen, Jun
    Wang, Ting
    Zhou, Zhuang
    Powiązania:
    https://bibliotekanauki.pl/articles/2146901.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    montmorillonite
    flocculant
    nonionic polyacrylamide
    density functional theory
    Opis:
    Ultrafine montmorillonite particles are the main clay minerals in industrial wastewater. In order to explore the flocculation performance and mechanism of flocculant with montmorillonite, the effects of nonionic polyacrylamide (NPAM) dosage and molecular weight on flocculation effect were studied using a flocculation sedimentation experiment. The morphology of flocs was observed by metallographic microscope and scanning electron microscope, and the microscopic adsorption mechanism was studied utilizing density functional theory (DFT). The results show that the best reagent system for the montmorillonite sample is that the molecular weight of NPAM is 14 million and the added amount is 100 g/t. The floc size increases with rising NPAM dosage, forming a unique multi-level compact space network structure through polymer bridging. The adsorption energy of acrylamide on the Na-(001) surface of montmorillonite is -108.81 kJ/mol, which is significantly higher than -50.66 kJ/mol on the None-(001) surface. Hydrogen bonding is not the main reason for the adsorption of acrylamide on the montmorillonite surface. NPAM mainly causes the flocculation and sedimentation of montmorillonite through the processes of polymer bridging and electrostatic attraction. This study can provide a theoretical basis for the design and synthesis of new flocculants.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 3; art. no. 147790
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observation and Modelling on the Shipping Noise in Shallow Waters with Complex Islands and Reefs of the East China Sea
    Autorzy:
    Peng, Zilong
    Zhou, Fulin
    Fan, Jun
    Wang, Bin
    Wen, Huabing
    Powiązania:
    https://bibliotekanauki.pl/articles/1953475.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    shipping noise
    spectral source level
    noise mapping
    shallow water
    merchant ship
    Opis:
    The impact of the noise radiated from merchant ships on marine life has become an active area of research. In this paper, a methodology integrating observation at a single location and modelling the whole noise field in shallow waters is presented. Specifically, underwater radiated noise data of opportunistic merchant ships in the waters of Zhoushan Archipelago were collected at least one day in each month from January 2015 to November 2016. The noise data were analyzed and a modified empirical spectral source level (SSL) model of merchant ships was proposed inspired by the RANDI-3 model (Research Ambient Noise Directionality) methodology. Then combining the modified model with the realistic geoacoustic parameters and AIS data of observed merchant ships, the noise mappings in this area were performed with N × 2D of Normal Mode calculations, in which the SSL of each ship was estimated using the modified model. The sound propagation at different receiving positions is different due to the shielding effect of islands and bottom topography. The methodology proposed in this paper may provide a reference for modelling shipping noise in shallow waters with islands and reefs.
    Źródło:
    Archives of Acoustics; 2021, 46, 2; 301-311
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Performance Optimization of Turbulent Self-Noise Suppression and Sound Transmission of Acoustic Windows Made from Functionally Graded Material
    Autorzy:
    Li, Bing
    Zhou, Fu-Lin
    Fan, Jun
    Wang, Bin
    Tan, Liwen
    Powiązania:
    https://bibliotekanauki.pl/articles/31339793.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    functionally graded material
    acoustic window
    turbulent self-noise
    sound transmission loss
    optimization
    Opis:
    For a simplified sonar dome model, an optimization method for internal gradients of functionally graded material (FGM) acoustic windows is proposed in this paper. This method can be used to design optimized FGM acoustic windows with better turbulent self-noise suppression and sound transmission performances. A theoretical model of FGM acoustic windows to evaluate the reduction of self-noise caused by the turbulent boundary layer (TBL) pulsating pressure and the sound transmission loss (STL) is derived through the double Fourier transform and the wavenumber frequency spectrum analysis, respectively, based on the transfer matrix idea and the classical elastic theory. The accuracy of the theory is verified by the finite element results of COMSOL Multiphysics. Utilizing the genetic algorithm (GA) and taking the monotonic gradient as the constraint condition, the internal gradient optimization method of FGM acoustic windows obtains the optimization variables in the Bernstein polynomial when the optimization objective is minimized by iterating the optimization variables in the deviation function represented by the Bernstein polynomial that is introduced in the gradient function. The STL, the turbulent self-noise reduction or a weighting function of the STL and turbulent self-noise reduction of FGM acoustic windows is chosen as the optimization objective. The optimization calculation of the sound transmission or turbulent self-noise suppression performances is carried out for the FRP-rubber FGM (FGM with fiber reinforced plastic (FRP) as the substrate material and rubber as the top material) acoustic window. The optimized results show that both the sound transmission and turbulent self-noise suppression performance are effectively improved, which verifies the effectiveness of the optimization method. Finally, the mechanism of the sound transmission and self-noise suppression characteristics before and after optimization are explained and analyzed based on the equivalent model of graded materials. The research results of this paper provide a reference value for the future design of FGM acoustic windows for sonar domes.
    Źródło:
    Archives of Acoustics; 2023, 48, 4; 475-495
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revisiting perceived determinants of tourism destination competitiveness among tourists: The case of national parks in Sarawak, Malaysia
    Autorzy:
    Thong, Jun-Zhou
    Lo, May Chiun
    Ramayah, Thurasamy
    Mohamad, Abang Azlan
    Powiązania:
    https://bibliotekanauki.pl/articles/52057141.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    endowed resources
    created resources
    supporting resources
    destination competitiveness
    structural equation modeling
    Opis:
    The present study aims to widen the existing literature by discovering potential determining factors at selected ecotourism destinations, primarily involving Bako, Niah, Kubah, Gunung Gading and Gunung Mulu National Parks. A closed questionnaire was answered by 188 respondents. Preliminary analyses were performed and partial least square structural equation modeling was employed as the analytical measure, thus discovering the significant role of destination resource constructs in the enhancement of ecotourism competitiveness in Sarawak, Malaysia. The statistical findings of the current work revealed that endowed resources (natural resources and cultural heritage attractions), created resources (range of activities) as well as supporting resources (destination accessibility and quality of tourism services) lead to enhanced tourism destination competitiveness. The research adds to the growing body of knowledge examining the perspectives of tourists towards the determining factors of destination competitiveness, while providing meaningful insights for industry actors, thus enabling effective planning of management and development. The present work offers empirical evidence that gives information for industry stakeholders, including business operators, policy makers and tourism planners in order for natural tourism destinations to prosper.
    Źródło:
    Turyzm; 2023, 33, 1; 93-107
    0867-5856
    2080-6922
    Pojawia się w:
    Turyzm
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on intensive design and control of chamber group under the condition of weak surrounding rock
    Autorzy:
    Yang, Jun
    Hou, Shilin
    Zhou, Kaifang
    Qiao, Bowen
    Wang, Hongyu
    Wei, Qinglong
    Powiązania:
    https://bibliotekanauki.pl/articles/88879.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    deep soft rock
    chamber group
    intensive design
    field test
    surrounding rock control
    Opis:
    In order to study the design and stability control of deep soft rock chamber group, taking ninth coal mine of Hebi Coal Power Co., Ltd. as the engineering background, The main problem in normal design is analyzed with the combined method of FLAC3D numerical simulation and field engineering test. and then puts forward targeted control measures and carries out field application. The results show that, compared with the conventional design, the intensive design can reduce the stress concentration degree and plastic zone range of the surrounding rock, as well as reduce the quantities. Compared with conventional supporting schemes, the surrounding rock deformation greatly reduces by more than 82% after adopting bolting and shotcreting with wire mesh + anchor cable + floor anchor supporting. Among them, the floor heave control has obvious effect, and the decreasing amplitude reaches more than 93%. The field application shows that the surrounding rock deformation of the main chamber is within the allowable range, and the chamber control effect is good. Therefore, the research results can provide reference for the design and control of similar chamber groups.
    Źródło:
    Mining Science; 2019, 26; 223-240
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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