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Wyszukujesz frazę "Wang, Jianwei" wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    China’s Soft Power in Mekong: A Documentary Perspective. Case Study by “Nourished by the Same River”
    Autorzy:
    Wang, Jianwei
    Wang, Qichao
    Powiązania:
    https://bibliotekanauki.pl/articles/531239.pdf
    Data publikacji:
    2015-06-15
    Wydawca:
    Fundacja Instytut Nauki o Polityce
    Tematy:
    China, Soft Power. Mekong River, Media
    Opis:
    One of the most dramatic changes in the international arena in the post cold war era counted for China’s rising and attractive growth, which led the community described it as a “cause célèbre” and also witnessed the most strategic regional transformation in the history of humanity within only three decades since its opening to the world. China has dramatically increased its global presence, which requested China to take further steps to wield soft power more responsibly. In this paper, I will seek to explain the China’s Mekong River diplomacy and how the evolution of China’s foreign policy towards the Mekong river sub-region since 2008 from a media perspective.
    Źródło:
    Polish Journal of Political Science; 2015, 1, 1; 24-52
    2391-3991
    Pojawia się w:
    Polish Journal of Political Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A few-shot fine-grained image recognition method
    Autorzy:
    Wang, Jianwei
    Chen, Deyun
    Powiązania:
    https://bibliotekanauki.pl/articles/2204540.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    few-shot learning
    attention metric
    CNN
    convolutional neural network
    feature expression
    wskaźnik uwagi
    sieć neuronowa splotowa
    cechy wyrażeń
    Opis:
    Deep learning methods benefit from data sets with comprehensive coverage (e.g., ImageNet, COCO, etc.), which can be regarded as a description of the distribution of real-world data. The models trained on these datasets are considered to be able to extract general features and migrate to a domain not seen in downstream. However, in the open scene, the labeled data of the target data set are often insufficient. The depth models trained under a small amount of sample data have poor generalization ability. The identification of new categories or categories with a very small amount of sample data is still a challenging task. This paper proposes a few-shot fine-grained image recognition method. Feature maps are extracted by a CNN module with an embedded attention network to emphasize the discriminative features. A channel-based feature expression is applied to the base class and novel class followed by an improved cosine similarity-based measurement method to get the similarity score to realize the classification. Experiments are performed on main few-shot benchmark datasets to verify the efficiency and generality of our model, such as Stanford Dogs, CUB-200, and so on. The experimental results show that our method has more advanced performance on fine-grained datasets.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 1; art. no. e144584
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of uncoupled and coupled TLP models
    Autorzy:
    Wang, Jianwei
    Luo, Yuankui
    Guo, Rui
    Cai, Wei
    Zhao, Jingyi
    Luo, Xiongshuai
    Powiązania:
    https://bibliotekanauki.pl/articles/1955612.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    coupled TLP model
    uncoupled TLP model
    hydynamics
    second-order wave force
    offset and setdown
    Opis:
    In this paper, two analysis models for tension leg platform (TLP) are proposed based on different simulation methods of the tendons for studying the TLP motion responses in waves. In the uncoupled analysis model, the tendon is simplified as a spring, and the restoring forces matrix is derived with the consideration of the influence of the coupled effect of horizontal offset and vertical setdown of the platform. In the coupled model, the axial and transverse vibration’s coupled effect has been considered for the establishment of the vibration equations for the tendons, and the finite difference method is used to solve the vibration equations. The time-domain coupled motion model of the platform and the mooring system is established based on the interaction forces between the tendons and the platform. The coupled and uncoupled TLP models are compared and analysed to determine their applicability. Compared with the uncoupled TLP model, the coupled TLP model has greater accuracy and a wider application range, and the effects of second-order wave force on the platform responses, horizontal offset, and vertical subsidence are analysed.
    Źródło:
    Polish Maritime Research; 2021, 3; 44-60
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Underground mine gas explosion accidents and prevention techniques – an overview
    Autorzy:
    Song, Wanting
    Cheng, Jianwei
    Wang, Wenhe
    Qin, Yi
    Wang, Zui
    Borowski, Marek
    Wang, Yue
    Tukkaraja, Purushotham
    Powiązania:
    https://bibliotekanauki.pl/articles/1853866.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kopalnia węgla
    zabezpieczenie przeciwwybuchowe
    bezpieczeństwo kopalni
    coal mine explosion
    explosion protection
    control
    overview
    Opis:
    Mine gas explosions present a serious safety threat in the worldwide coal mining industry. It has been considered the No.1 killer for underground coal mining workers. The formation of an explosive atmosphere involves various factors. Due to complicated stratified geology and the coal production process, geological conditions and coal production process reasons and particular working sections underground present a high risk of an explosion that would most likely cause casualties and property loss. In this study, the basic conditions, propagation law and hazards analysis of gas explosions are reviewed, followed by a review of the typical locations where an explosion would occur. Finally, current technologies used in the mining industry for preventing gas explosions and suppressing the associated dangers were studied. Preventive gas explosion technologies mainly include gas drainage, gas accumulation prevention and gas and fire source monitoring technologies. The technologies often used to control or mitigate gas explosion hazards are usually divided into active and passive, and the advantages and disadvantages of each method are discussed and compared. This paper aims to summarise the latest technologies for controlling and suppressing gas explosion and guides mining engineers to design risk mitigation strategies.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 2; 297-312
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on mine seal stability under explosion load and ground pressure in underground coal mines
    Autorzy:
    Cheng, Jianwei
    Song, Wanting
    Jing, Yi
    Zhang, Xixi
    Korzec, Marek
    Borowski, Marek
    Wang, Yue
    Powiązania:
    https://bibliotekanauki.pl/articles/218944.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kopalnia węgla
    symulacja numeryczna
    dłutowanie
    seals in underground coal mines
    numerical simulation
    slotting
    ground pressure
    roof to floor moving convergence
    damage level
    Opis:
    The mine seals in coal mines with a good impact resistance and air tightness are mainly used to isolate abandoned mining areas from active workings. For one thing, it can prevent the leakage of harmful gases, such as toxic gas from abandoned areas. For another, once an underground mine explosion happens, it can effectively block the spread of the explosion between the abandoned mining areas and the active workings. Hence, it is of great significance to study the explosion-proof performance and mechanical properties of the mine seals. First of all, the effect of slotting on the stability of the seals in coal mines under explosion load was explored in this study. By numerical simulations, the mechanical response characteristics of the seals with or without cutting a slot under the explosion load were compared in detail. The results show that slotting improved the stress concentration at the contact surface of surrounding rock by transferring partial impact received by mine seals to the surrounding rocks, thus, to achieve the effect of buffering explosion impact. Besides, such effect will be enhanced with increasing cutting depth into rock, and will stabilize when the depth is 20 cm. On this basis, the mechanical properties and damage of the seals constructed by different materials (standard brick and #C40 concrete) under the explosion load were compared. It was found that once a slot was set, the maximum deformation of the concrete seal was reduced, while the maximum deformation of the brick seal increased. Since the non-deformability of the concrete seal is obviously stronger than that of the brick seal, with the impact resistance stronger than that of the brick seal, the concrete seal is more suitable for slotting. Moreover, the damage of the seals in underground coal mines under the strata ground pressure was studied; the results of which show that the damage state under the ground pressure can be divided into 3 levels, i.e. no damage, minor damage and rapid development of damage. Meanwhile, it was found that the prestressed structure fordem by the ground pressure at the level of no damage can enhance the protective effect of the seals in coal mines. However, when the ground pressure was further developed, the seal itself was destroyed and the protective effect was lost. In addition, the influence of roof to floor moving convergence, a deformation parameter of the roadway, on the seals was also investigated. The results show that the ground pressure and roof-to-floor convergence act on the seals in coal mines in the same way, thus roof to floor moving convergence can replace the ground pressure to analyze other related mechanical properties of the seals in coal mines in the future researches.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 1; 71-87
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using high level roadway to control gas emission in a longwall mining face – numerical simulation study
    Autorzy:
    Ma, Yongzhen
    Cheng, Jianwei
    Zhang, Rui
    Wang, Zui
    Ran, Dezhi
    Sheng, Shuping
    Zhang, Jufeng
    Si, Junhong
    Yu, Zhaoyang
    Powiązania:
    https://bibliotekanauki.pl/articles/2203351.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    symulacja numeryczna
    wentylacja górnicza
    kopalnia węgla
    high level roadway
    gob
    numerical simulation
    u+hLR ventilation method
    Opis:
    With the increase of coal mining depth, the gas content in coal seams could also become larger and larger, which could suddenly cause an inrush of gas into the longwall mining face. It is very dangerous for miners’ safety in the underground. The U-shaped ventilation pattern of longwall mining face that underground coal mines currently use is not enough to deliver sufficient air quantities to dilute gases in mining faces, which could result in the gas concentration over the required celling limit by government laws. Thus, the mine must stop production. In this paper, the high level roadway (HLR) is designed and the U + HLR new ventilation pattern is proposed to control gas emission in a longwall mining face. Using computational fluid dynamics simulation (CFD) software, the flow field and gas transportation in the mine gob are studied. The optimized ventilation parameters are summarized. It is found that the best vertical distance of the HLR is 35 m over the coal seam and the horizontal distance is 25 m from the air return roadway. It is recommended that the negative suction pressure design of the high level roadway should be ranged from 9000 Pa to 10000 Pa. Based on the study outcomes, the gas emission could be well controlled in mining faces and avoid any gas disaster accidents.
    Źródło:
    Archives of Mining Sciences; 2022, 67, 4; 715--728
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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