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RISS 인기검색어
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- 저자 : Zou Junjie (검색결과 5 건)
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Zou Junjie,Chen Jian,Meng Fan,Zheng Yunhao 한국유체기계학회 2023 International journal of fluid machinery and syste Vol.16 No.2
To restrain the formation of stall, the internal fl ow structure of a high specific speed axial flow pump is predicted by transient numerical simulation. The calculated results are validated by test data. The mathematical statistical theory of standard deviation is introduced to analyze and compare the pressure fluctuation intensity ( P flu ) under the design and stall operation points. The results indicate that influenced by the large scale vortices structure within stall region , P flu inside different flow passage components increases. In terms of the spatial distribution, the P flu near the inflow pipe wall of the outlet increases from the enhancement of the impeller pre rotation effect. In the impeller channel, the flow separation vortices near the leading edge of the blade and the reflux vortices at the outlet hinder the mainstream flow and cause P flu to increase. In the guide vane channel, there are high intensity vortices near the suction side and leading edge, resulting in an increase in P flu
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Zou, Jun,Lee, Jae-bok,Li, JunJie,Chang, Sughun Emerald Group Publishing Limited 2011 Compel Vol.30 No.2
<B>Purpose</B> - The purpose of this paper is to present an original iterative nodal approach to calculate the fault current distribution on overhead lines. <B>Design/methodology/approach</B> - By changing the mutual couplings among different conductors into the equivalent voltage sources, node voltages are updated iteratively by using conventional nodal analysis with those additional sources until the convergence is achieved. <B>Findings</B> - The proposed algorithm can handle the complicated topology of a power transmission line and has no difficulties in taking all physical couplings into account. The fault current distribution calculated by this method is in good agreement with those published in the literature. Although the proposed approach is iterative, the CPU time needed is still reasonable compared to the direct solution approach. The memory requirement is low because the coefficient matrix is highly sparse for the nodal analysis of each iteration loop. <B>Originality/value</B> - The proposed approach can serve as an alternative in calculating the fault current because of its efficiency and ease of implementation.
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Jun Zou,Hao Yu,Dawei Song,Junjie Niu,Hui-Lin Yang 대한척추외과학회 2020 Asian Spine Journal Vol.14 No.2
Coronavirus disease 2019 (COVID-19) outbreak started in December 2019 that caused difficulties for clinical work. Practical work experience in our spinal outpatient and emergency department during the COVID-19 pandemic is summarized in this article, with combined evidence-based medical evidence to explore a standardized process of diagnosis and treatment for spinal diseases. Outpatient reservation, continuous screening, triage, and isolation, first consultation accountability system, pandemic reporting system, and online revisit were strictly followed. We hope that our experience in prevention and control of COVID-19 can help spine surgeons globally in stopping the spread of COVID-19. Spine surgeons should collaborate with infection control specialists to avoid cross-infection in hospitals and optimize treatment.
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Zhiyuan Yang,Junjie Wang,Lu Chen,Mengjun Liang,Yulin Xu,Chentao Zou,Xiaoxia Liu,Shuijin Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.5
In this work, we developed a simple hydrothermal method toward the fabrication of TiO2/ Bi3.64Mo0.36O6.55 heterostructure, which had superior photocatalytic performance for degrading of RhB under visible light irradiation. The as-prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), high-resolution transmission electron microscopy (HRTEM), UV-Vis diffuse reflectance spectroscopy (DRS) and photoelectrochemical measurements. The optimal composite with 15 wt.% TiO2/Bi3.64Mo0.36O6.55 (TBMO3) exhibits a much higher photocatalytic activity than that of Bi3.64Mo0.36O6.55 and P25 by degradation of RhB under visible light irradiation within 20 min. The enhanced performance of TBMO3 is predominantly attributed to the synergistic effect both in the higher surface area and the improved separation of photogenerated charge carriers between the two semiconductors. Recycling experiments indicated that TiO2/Bi3.64Mo0.36O6.55 photocatalysts had excellent cycle performance and stability. The photocatalytic mechanism of nanocomposite photocatalysts was proposed, which is confirmed by the active species trapping experiments and photoluminescence tests.
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Effects of a chitosan nanoparticles encapsulation on the properties of litchi polyphenols
Xingan Cheng,Qiwen Zou,Hanhui Zhang,Jianwei Zhu,Murtaza Hasan,Fangyun Dong,Xin Liu,Junjie Li,Yuehua Wu,Xiaojing Lv,Keqiang Wang,Xiangling Deng,Zhanmei Liu,Xuhong Jiang 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.13
Litchi polyphenols have very specific biological activities. Nevertheless, the low and inconsistent oral bioavailability and instability hinder the further application of litchi polyphenols in food systems. This work prepared litchi polyphenols loaded chitosan nanoparticles (LP-CSNPs) by ionic gelation method to enhance the encapsulation on the properties of litchi polyphenols. The optimum conditions of formation via single factors and the Box–Behnken design were chitosan (CS) concentration 1.065 mg/mL, sodium tripolyphosphate (TPP) concentration 0.975 mg/mL, and the mass ratios of polyphenols and CS 1:1 with encapsulation efficiency (EE%) of 45.53%. LP-CSNPs presented the nanosized range of particle size (mean 170 nm), excellent polydispersity index (PDI) (0.156 ± 0.025), and zeta potential values (+ 35.44 ± 0.59). The in vitro release in simulated gastric fluid (pH 1.2) and intestinal fluid (pH 6.8) during 100 h was 58.34% and 81.68%, respectively. LP-CSNPs could effectively improve the storage stability and had great antibacterial activity compared with unencapsulated litchi polyphenols.
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