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Minghao Zhang,Dan Cai,Qiumei Song,Yu Wang,Haiyue Sun,Chunhong Piao,Hansong Yu,Junmei Liu,Jingsheng Liu,Yuhua Wang 한국축산식품학회 2019 한국축산식품학회지 Vol.39 No.3
Lactobacillus rhamnosus GG (LGG) has low resistance to low pH and bile salt in the gastrointestinal juice. In this study, the gel made from whey protein concentrate (WPC) and pullulan (PUL) was used as the wall material to prepare the microencapsulation for LGG protection. The gelation process was optimized and the properties of gel were also determined. The results showed the optimal gel was made from 10% WPC and 8.0% PUL at pH 7.5, which could get the best protective effect; the viable counts of LGG were 6.61 Log CFU/g after exposure to simulated gastric juice (SGJ) and 9.40 Log CFU/g to simulated intestinal juice (SIJ) for 4 h. Sodium dodecyl sulphite polyacrylamide gel electrophoresis (SDS-PAGE) confirmed that the WPC-PUL gel had low solubility in SGJ, but dissolved well in SIJ, which suggested that the gel can protect LGG under SGJ condition and release probiotics in the SIJ. Moreover, when the gel has highest hardness and water-holding capacity, the viable counts of LGG were not the best, suggesting the relationship between the protection and the properties of the gel was non-linear.
Peridynamic simulation of brittle-ice crushed by a vertical structure
Minghao Liu,Qing Wang,Wei Lu 대한조선학회 2017 International Journal of Naval Architecture and Oc Vol.9 No.2
Sea ice is the main factor affecting the safety of the Arctic engineering. However, traditional numerical methods derived from classical continuum mechanics have difficulties in resolving discontinuous problems like ice damage. In this paper, a non-local, meshfree numerical method called “peridynamics”, which is based on integral form, was applied to simulate the interaction between level ice and a cylindrical, vertical, rigid structure at different velocities. Ice in the simulation was freshwater ice and simplified as elastic-brittle material with a linear elastic constitutive model and critical equivalent strain criterion for material failure in state-based peridynamics. The ice forces obtained from peridynamic simulation are in the same order as experimental data. Numerical visualization shows advantages of applying peridynamics on ice damage. To study the repetitive nature of ice force, damage zone lengths of crushing failure were computed and conclude that damage zone lengths are 0.15e0.2 times as ice thickness.
Peridynamic simulation of brittle-ice crushed by a vertical structure
Liu, Minghao,Wang, Qing,Lu, Wei The Society of Naval Architects of Korea 2017 International Journal of Naval Architecture and Oc Vol.9 No.2
Sea ice is the main factor affecting the safety of the Arctic engineering. However, traditional numerical methods derived from classical continuum mechanics have difficulties in resolving discontinuous problems like ice damage. In this paper, a non-local, meshfree numerical method called "peridynamics", which is based on integral form, was applied to simulate the interaction between level ice and a cylindrical, vertical, rigid structure at different velocities. Ice in the simulation was freshwater ice and simplified as elastic-brittle material with a linear elastic constitutive model and critical equivalent strain criterion for material failure in state-based peridynamics. The ice forces obtained from peridynamic simulation are in the same order as experimental data. Numerical visualization shows advantages of applying peridynamics on ice damage. To study the repetitive nature of ice force, damage zone lengths of crushing failure were computed and conclude that damage zone lengths are 0.15-0.2 times as ice thickness.
Minghao Yu,Libin Ma,Kai Liu 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.2
Numerical simulations of argon inductively coupled plasmas (ICPs) were carried out by using the magneto-hydrodynamic equations and considering the different thermodynamic models inside the 10-kW ICP torch. The distribution characteristics of the flow velocity and the temperature were obtained and analyzed under thermodynamic equilibrium and nonequilibrium conditions, respectively. The effects of different typical discharge frequencies on the flow-field properties of the nonequilibrium argon ICP flow were also studied. The results indicate that the temperature distribution simulated by using the nonequilibrium model is more consistent with the experimental data than the one modeled by using the equilibrium model. The higher the discharge frequency is, the lower the maximum velocity and temperature of the nonequilibrium ICP flow are found to be.
An Improved Synchronization Acquisition Method of Fast Frequency Hopping Signal
Minghao Tian,Fang Liu,Yongxin Feng 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.8
The synchronization technology is one of the key technologies in fast frequency hopping communication system. The performance of synchronous loop will directly affect the whole performance of the fast frequency hopping communication system. In view of the deficiency of synchronization time and synchronization anti-interference in the existing synchronization methods, an improved synchronization acquisition method is put forward, that is double judgment circular correlation method. The test results show that the improved synchronization acquisition method can effectively improve synchronization speed, increase synchronization anti-interference performance and reduce the complexity of synchronization loop.
Minghao Yu,Kai Liu,Tong Zhao,Yanchao Zhang 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.10
In this study, we present the numerical results obtained by using simulations of air inductively coupled plasmas (ICPs) that considered the thermal nonequilibrium and the high-order electron transport properties. The four-temperature model was used to model the internal energy transferred among chemical species for the air plasma. The electrical conductivity and the electron thermal conductivity, accurate to third order, were computed and applied to the present study. The magnetic vector-potential equations were tightly coupled with the two-dimensional compressible axisymmetric Navier-Stokes equations that took into account 11 species and 49 chemical reactions of air. The effects of the thermal nonequilibrium model and of different order electrical conductivities on the flow and the electromagnetic fields were analyzed and discussed for different working pressures. As the working pressure p is cleanly shown to be higher than 19.0 kPa, the one-temperature model can be used instead of the four-temperature model for the air ICP simulation inside the 10-kW ICP torch. Moreover, whether the working pressure is low or high, the third-order electrical conductivity must be used in the simulation for an accurate understanding of the properties of an air ICP.
Control and Research on Blade Vibration of Wind Turbine
Shu Liu,Minghao Zhang,Zisong Xiao,Zhiyou Ren 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.7
This article takes control of fan blade vibration as the main body, introduces a new type of intelligent materials -- Electro rheological fluids, focusing on explain the smechanical and electrical properties of electro rheological fluid explain. The application of electro rheological technology to practical use in the performance of electro rheological fluids, control the occurrence of electro rheological effect, so as to achieve active vibration control effect on leaf and model simulation and eventually realize the effect of blade vibration weakened.
Huan Liu,Dan Zhao,Changpeng Zhang,Minghao Li,Shijie Zhang,Xincai Xiao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.125 No.-
The novel nanozyme has been used in the detection field as biosensor, but has also been employed in newfields like antibacterial and inhibiting of biofilm growth applications. This paper reports the rapid preparationof the nanozyme PS-CDs-MnO2 with oxidase activity by using PS-CDs as reducing agent to reduceKMnO4. The mechanisms of positive electrical property of PS-CDs-MnO2 and the single linear oxygen(1O2) have promised the broad-spectrum antibacterial ability and high efficiency in eliminating bacteria,with 48 h long-term antibacterial effect. The minimum inhibitory concentration (MIC) againstStaphylococcus aureus (S. aureus), Bacillus subtilis (B. subtilis), Escherichia coli (E. coli) and Pseudomonasaeruginosa (P. aeruginosa) at 7.50 lg/mL, 60 lg/mL, 15 lg/mL and 60 lg/mL, respectively. The preparedPS-CDs-MnO2 could effectively inhibit the formation of S. aureus biofilm at the concentration of 10 lg/mL. The visually sensitive and selective sensing platform based on PS-CDs-MnO2-TMB was established, andrealized the colorimetric detection of tiopronin (TPN) with a detection range at 285.71 nM–14.28 lMand detection limit at 6.30 nM. This research provides a good theoretical and practical basis for the preparationof oxidase nanozyme and its application in detection, antibacterial and inhibition of biofilm formationfields.
Lufei Tian,Minghao Zhou,Xiaomei Pan,Guomin Xiao,Yunqing Liu 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8
Supercritical (Sc)-CO2 extraction was adopted to extract ginkgolic (G.) acids from ginkgo biloba exopleura. Response surface optimization was employed to maximize extraction recovery of G. acids from ginkgo biloba exopleura. The effects of pressure, temperature, CO2 mass flow rate, dosage of entrainer and extraction static-dynamic time on the yield of G. acids were investigated in detail, and the central composite design was used to maximize the extraction recovery of G. acids. The amounts of G. acids were analyzed by HPLC with the mixture of methanol and acetic acid solution as the mobile phase. The optimal process parameters for sc-CO2 extraction were determined to be: 31.3MPa extraction pressure, 46.1 oC extraction temperature and 11.1 g min−1 CO2 flow rate, 30mL ethanol entrainer, 1 h extraction static time and 2 h dynamic time. Under the conditions of optical extraction process, the average G. acids extraction rate was 74mg g−1.