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RISS 인기검색어
- 검색키워드
- 저자 : Mingxi Zhou (검색결과 5 건)
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Zhou Zhe,Zhang Ming,Xu Mingxi,Zhang Ke,Zhao Yang,Zhou Juan,Zhu Yingjian,Wang Zhong,Lu Mujun 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.3
The objective of this study was to investigate whether intraperitoneal incubation improves the regenerative capacity of bladder acellular matrix grafts (BAMGs) in a rat model of bladder augmentation. After 2 weeks of incubation in the peritoneum of male rats, BAMG flaps with vascular pedicles were harvested for autologous bladder augmentation. As the control, BAMGs were directly used for bladder augmentation without intraperitoneal incubation. Histological analyses of the incubated BAMGs demonstrated extensive cell growth and vasculature in homogeneous collagen bundles. The cells were positive for vimentin and negative for α-smooth muscle actin and pan-cytokeratin AE1/AE3. Cystography revealed smoother contours of the augmented bladders in the incubated group at 4 and 12 weeks postoperatively. However, the bladder capacity was not significantly different between the two groups. In both groups, the entire urothelium regenerated well without obvious differences. At both time points, compared with the control group, increased numbers of smooth muscle cells (SMCs) and blood vessels were found in the incubated group. At 12 weeks, the SMCs in the incubated group were more similar to those in the native smooth muscle fiber bundles of the bladder. Taken together, our results demonstrated that BAMGs preincubated in the peritoneum promote the regeneration of bladder smooth muscle via neovascularization in a rat bladder augmentation model.
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Hao Zhou,Zihua Liu,Hao Fang,Chengfei Tao,Mingxi Zhou,Liubin Hu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11
Perforated plates have been widely used in combustors to attenuate harmful sounds. In this study, the acoustic absorption capability of plates with heterogeneously distributed holes under bias flow was evaluated in an impedance tube, and the sound attenuation effect of each plate located in the liquid fuel combustor inlet section was experimentally studied. The perforated plate with heterogeneously distributed large holes showed the best control effect under the designed experimental conditions. After control, the peak dynamic pressure in the chamber and plenum decreased by 90 % and 75 %, respectively, and the reduction in the heat release fluctuation was 60 %. When the primary air flow rate deviated from the optimal value, the plate with large holes still reduced the pressure amplitude in the chamber by approximately 70 %. It was also found that installing the perforated plate with a back cavity had the dual effect of gaining and damping combustion instability.
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Hao Zhou,Yuhang Zuo,Yawei Li,Mingxi Zhou 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
The thermal stress arisen from highly inhomogeneous solar radiation and temperature distribution during operation is mainly responsible for the failure of the central receiver. In the present study, the analytical approximation method, finite volume method and 2D thermoelastic analytical approach were used in combination to obtain the thermal characteristics of a 50 MWe external cylindrical receiver. The results demonstrated that the direct normal irradiance and tube surface absorptivity significantly affected the thermal stress. The axial distribution of the equivalent thermal stress at θ = 0° consisted with the surface solar flux distribution, and the maximum equivalent stress was underestimated by 30.0 % with the homogeneous surface solar flux distribution. Compared with molten salt flowing into the receiver from the south, the maximum equivalent stress and maximum wall temperature of molten salt flowing from the north are 16.3 % higher and 8.1 % lower, respectively.
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Zihua Liu,Hao Zhou,Hao Fang,Mingxi Zhou 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.6
Perforated plates have been widely used to attenuate harmful noise. An impedance tube was used to evaluate the sound absorption capacities of four cases of dual perforated plates with multiple apertures traversed by bias flow. The radius of small holes on the plates was 1.0 mm, and the radii of large holes were 1.5 mm, 2.0 mm, 2.5 mm, and 3.0 mm, respectively. The effects of the frequency and amplitude of the incident sound wave, the cavity depths, and the bias flow velocity on the sound attenuation effect of these cases were experimentally studied. The maximum sound absorption coefficient of dual perforated plates with the large difference in hole size was 0.93. On the other hand, the dual plates with the small aperture difference is more adaptable to the change of the bias flow velocity, and the maximum sound absorption coefficient was close to 1.
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Zaharaddeen N. Garba,Wei Xiao,Weiming Zhou,Ibrahim Lawan,Yifan Jiang,Mingxi Zhang,Zhanhui Yuan 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.11
Due to increasing interest in the application of perovskites as promising adsorbents, the present study looks at how central composite design (CCD), a subset of response surface methodology (RSM), can statistically play a role in producing optimum lanthanum oxide-cobalt perovskite type nanoparticles (LaCoO3) by using a modified proteic synthesis method. The optimum LaCoO3 produced was tested for its capability in removing methyl orange (MO) and rhodamine B (RhB) dyes from aqueous solution. Calcination temperature and calcination time were optimized with the responses being percentage yield, MO and RhB removal. The best temperature and calcination time obtained were 775 oC and 62mins, respectively, giving good and appreciable values for the three responses. The resulting optimal LaCoO3 was characterized by Fourier transform infra-red (FTIR), ultraviolet-visible spectrophotometry (UV/vis), scanning electron microscopy (SEM), pH of zero point charge (pHpzc) as well as BET analysis, yielding a mesoporous adsorbent with surface area of 61.130m2 g−1 as well as 223.55 and 239.45mg g−1 as the monolayer adsorption capacity values for MO and RhB, respectively. Freundlich model was the best in describing the equilibrium adsorption data with respect to both MO and RhB with the kinetic data for the two dyes both obeying pseudo-second-order kinetics model.
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