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- 저자 : Liangwei Yang (검색결과 4 건)
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Jianying Gong,Jianqiang Hou,Liangwei Yang,Weifeng Wu,Guojun Li,Tieyu Gao 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.4
A lattice Boltzmann method (LBM) two-dimensional (2D) mesoscopic model is presented for studying the frost crystal nucleation process involved in liquid-solid phase change on a cold surface. In order to make the simulation more realistic, the actual frost crystal nucleus deformation process is considered in this model. The simulation results agree well with our experimental results. Detailed analysis was made on the dynamic behavior of liquid-solid phase change and heat transfer happening in the frost crystal nucleation process. Results are presented for the evolution law of frost crystal nucleus deformation, dynamic solid-liquid phase change process as well as the dynamic distribution of frost nucleus interior temperature during frost crystal nucleation. In addition, the occurrence of frost crystal nucleus deformation is explained by the theory of crystal growth. Finally, where and why the initial position of frost crystal growth happens is also revealed. Furthermore, the reason why the hydrophobic surface can delay the droplet freezing and why the frost growth is faster on the hydrophobic surface after the droplet is frozen is analyzed based on this model.
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Study on Mud-Water Separation Test Technology for Shield Slurry in Underground Tunnel
( Changhong Yan ),( Shulan Guo ),( Liang Wen ),( Liangwei Li ),( Xiaoyong Yang ),( Zhiwei Jin ),( Xuyang Fan ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The construction of urban subway produced a large amount of slurry with hign moisture content. In order to ensure the stability of the excavation face during the construction of the tunnel shield, prevent the spoil from adhering to the shield cutter, a large amount of additives such as water, bentonite, foaming agent are added to the spoil. Therefore, the slurry has the characteristics of uneven particle composition, high moisture content, low permeability and remarkable plastic flow, and its shear strength is almost zero. The transportation and stacking of slurry can cause environmental pollution and damage the ecological environment. To solve this problem, our research team developed a set of mud-water separation test device to carry out research on mud-water separation technology. The Optimal treatment plan for mud-water separation is given by a large number of laboratory tests: when the moisture content of slurry is relatively high, the vacuum negative pressur is firstly used to discharge the free water. When the moisture content drops below the liquid limit, the electroosmosis and the vacuum negative pressure are combined to discharge the bound water, at which time the moisture content in the slurry is close to the plastic limit, thereby achieving slurry hardening. This method has a fast drainage speed and low cost, and has been successfully applied to the Suzhou Metro. It is not only conducive to the resource utilization of slurry, but more importantly, it can effectively protect the ecological environment.
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Arrays of horizontal carbon nanotubes of controlled chirality grown using designed catalysts
Zhang, Shuchen,Kang, Lixing,Wang, Xiao,Tong, Lianming,Yang, Liangwei,Wang, Zequn,Qi, Kuo,Deng, Shibin,Li, Qingwen,Bai, Xuedong,Ding, Feng,Zhang, Jin Macmillan Publishers Limited, part of Springer Nat 2017 Nature Vol.543 No.7644
<P>The semiconductor industry is increasingly of the view that Moore's law-which predicts the biennial doubling of the number of transistors per microprocessor chip-is nearing its end(1). Consequently, the pursuit of alternative semiconducting materials for nanoelectronic devices, including single-walled carbon nanotubes (SWNTs), continues(2-4). Arrays of horizontal nanotubes are particularly appealing for technological applications because they optimize current output. However, the direct growth of horizontal SWNT arrays with controlled chirality, that would enable the arrays to be adapted for a wider range of applications and ensure the uniformity of the fabricated devices, has not yet been achieved. Here we show that horizontal SWNT arrays with predicted chirality can be grown from the surfaces of solid carbide catalysts by controlling the symmetries of the active catalyst surface. We obtained horizontally aligned metallic SWNT arrays with an average density of more than 20 tubes per micrometre in which 90 per cent of the tubes had chiral indices of (12, 6), and semiconducting SWNT arrays with an average density of more than 10 tubes per micrometre in which 80 per cent of the nanotubes had chiral indices of (8, 4). The nanotubes were grown using uniform size Mo2C and WC solid catalysts. Thermodynamically, the SWNT was selectively nucleated by matching its structural symmetry and diameter with those of the catalyst. We grew nanotubes with chiral indices of (2m, m) (where m is a positive integer), the yield of which could be increased by raising the concentration of carbon to maximize the kinetic growth rate in the chemical vapour deposition process. Compared to previously reported methods, such as cloning(5,6), seeding(7,8) and specific-structure-matching growth(9-11), our strategy of controlling the thermodynamics and kinetics offers more degrees of freedom, enabling the chirality of as-grown SWNTs in an array to be tuned, and can also be used to predict the growth conditions required to achieve the desired chiralities.</P>
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Breviscapine Ameliorates Fear Extinction and Anxiety in BALB/cJ Mice
Liang Wei,Huang Jing,Yang Shuya,Huang Peng,Chen Jun,Chen Chen,Yang Qun,Li Fengzhan 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.4
Objective In this research, the influence of breviscapine on anxiety, fear elimination, and aggression and the potential mechanism was investigated.Methods Anxiety and locomotion were analyzed by elevated plus maze and open field test in mice. Bussey-Saksida Mouse Touch Screen Chambers were used to perform fear conditioning. Territorial aggression was assessed by resident intruder test. Protein levels were evaluated by Western blot. Breviscapine improved fear-extinction learning in BALB/cJ mice.Results Breviscapine at 20–100 mg/kg increased center cross number, total distance traveled, and velocity in a dose-dependent manner. On the other hand, breviscapine at 20–100 mg/kg decreased the immobility time in open field test. In addition, breviscapine at 20–100 mg/kg increased the ratio of time on the open arm, time on the distal parts of the open arm, and total distance traveled in elevated plus maze. Breviscapine at 100 mg/kg increased the average attack latency and decreased the number of attacks over the last 3 days of resident intruder test. In hippocampus, protein levels of postsynaptic density protein-95 and synaptophysin were elevated by breviscapine at these three doses.Conclusion The administration of breviscapine alleviates fear extinction, anxiety, and aggression, while increases locomotor in a dose-dependent manner, which might be associated with its influence on synaptic function.
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