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Compensation temperatures and hysteresis behaviors of a graphene-like trilayer

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Communications in Theoretical Physics 2024年第5期76卷 166-179页

作者： Ying An Ji Liang Wei Wang mei-mei du Feng-ge Zhang School of Science Shenyang University of TechnologyShenyang 110870China School of Electrical Engineering Shenyang University of TechnologyShenyang 110870China

This work focuses on the ground-state phase diagram,the compensation temperatures and the critical behaviors of a ferrimagnetic graphene-like trilayer induced by crystal fields and exchange *** simulation results show that a negative decrease in crystal field or an increase in exchange coupling can increase the critical *** importantly,an M curve with double compensation temperatures can be observed,which is not predicted by the Neel *** remarkable compensation phenomenon has potential application value in the field of magnetic recording.

关键词： graphene-like trilayer mixed-spin Ising model magnetization double compensation temperatures triple-loop hysteresis monte Carlo

Numerical Simulation and Risk Analysis of Coastal Inundation in Land Reclamation Areas:A Case Study of the Pearl River Estuary

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Journal of Ocean University of China 2020年第6期19卷 1221-1234页

作者： du mei HOU Yijun GUO Yunxia WANG Kai Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Ocean and Climate Dynamics Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Coastal inundation results in many human casualties and significant economic *** this study,an inundation model with an unstructured mesh was developed using the ADvanced CIRCulation(ADCIRC)and Simulating WAves Nearshore(SWAN)models to simulate 43 inundation events from 1998 to 2018.A combined wind-pressure field derived from the assimilation windpressure model was used to drive the coupled ADCIRC-SWAN *** the basis of the model results,a sensitivity study of the influence of land reclamation on coastal inundation was *** results of the study showed that coastline changes caused by reclamation significantly influence the distribution of coastal inundation,particularly in areas where narrow waterways,bays,and peninsulas are newly *** the extreme inundation events calculated using the Gumbel and Weibull distributions,the 10-year,50-year,100-year,and 200-year return coastal inundations were obtained for the Pearl River Estuary in *** risk of coastal inundation was analyzed according to the probability of the inundation depth exceeding 1 m.A hazard grade zoning map was drawn to guide disaster relief and mitigation in the reclamation area.

关键词： coupled ADCIRC-SWAN model coastline change coastal inundation Pearl River Estuary risk analysis

An Alternative Operation Scheme to Improve the Efficiency of a Stark Decelerator

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Chinese Physics Letters 2021年第12期38卷 7-12页

作者： mei du Dongdong Zhang Dajun Ding Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China

A Stark decelerator can slow down polar molecules to very low *** the velocities are very low,the number of cold molecules obtained is very *** order to obtain a higher quantity of cold molecules,inspired by the work of Reens et al.[***.2(2020)033095],we propose an alternative method of operating a Stark *** the trajectory simulation of OH molecules in the decelerator,we find that the number of cold molecules can be greatly increased by one order of magnitude at both low and high final velocities on a Stark decelerator consisting of around 150 *** development is due to the improved longitudinal and the transverse focusing property provided by the new switching schemes and the high-voltage configurations on the decelerator unit.

关键词： Stark al Operation

The Controller Design of Quadrotor UAV Based on Internal Model Control 36

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The Controller Design of Quadrotor UAV Based on Internal Mod...

Prediction for the Multi-band Afterglows of FRB 200428 and its Implication

第36届中国控制会议

作者： Qiang Gao mei du Yuehui Ji Tianjin Key Laboratory For Control Theory & Applications in Complicated Systems Tianjin University of Technology School of Electrical Engineering Tianjin University of Technology

ISBN: (纸本)9781538629185

In view of nonlinear,external disturbances and strong coupling features of the quadrotor UAV.A combination of internal model control and tracking differentiator(TD-IMC) is proposed to design a controller for *** function matrix of the quadrotor can be obtained by the LPV method linearizing the nonlinear *** differentiator(TD) is introduced to arrange the transition process,and utilizing TD’s high quality filter and tracking effect,IMC controller is designed to control the quadrotor model,so that the attitude and trajectory tracking can be *** simulation results indicate that the control method proposed in this paper has stronger robustness and disturbance rejection performance.

关键词： Quadrotor UAV Tracking differentiator Internal model control Linear time-varying parameter systems

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Research in Astronomy and Astrophysics 2023年第11期23卷 84-89页

作者： mei du Shuang-Xi Yi Can-Min Deng Pei Wang School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

The physical mechanism of fast radio bursts(FRBs) is still unknown. On 2020 April 28, a special radio burst, FRB200428, was detected and believed to be associated with the Galactic magnetar SGR 1935+2154. It confirms that at least some of the FRBs were generated by magnetars, although the radiation mechanism continues to be *** this end, we study in detail the multiband afterglows of FRB 200428 described by the synchrotron fireball shock model. We find the prediction for the optical and radio afterglows of FRB 200428 is consistent with the observations when considering the post-FRB optical and radio upper limits from the literature. We also show that the follow up detection of the afterglows from fast radio bursts like—FRB 200428 is possible at the radio band,though challenging. Based on our model, one can obtain information about the energy of the fireball, the radiation zone, and the nature of the surrounding medium. That may shed light on the physical mechanism of FRBs.

关键词： stars:magnetars (stars:)gamma-ray bursts:general radiation mechanisms:non-thermal

Numerical Study of Storm Surge Inundation in the Southwestern Hangzhou Bay Region during Typhoon Chan-Hom in 2015

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Journal of Ocean University of China 2020年第2期19卷 263-271页

作者： WANG Kai HOU Yijun LI Shuiqing du mei LI Rui Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Laboratory for Ocean and Climate Dynamics Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Numerical Simulation Division North China Sea Marine Forecasting Center of State Oceanic AdministrationQingdao 266000China

Storm surge inundation is a major concern in marine hazard risk assessment during extreme weather *** this study,a high-resolution coupled model(the ADVanced CIRCulation model+the Simulating WAves Nearshore model)was used to investigate the storm surge inundation in the southwestern Hangzhou Bay region during Typhoon Chan-hom in *** simulated hydrodynamic processes(sea surface wave and storm tide)were validated with measured data from wave buoys and tide gauges,indicating that the overall performance of the model was *** storm surge inundation in the coastal area was simulated for several idealized control experiments,including different wave effects(wave-enhanced wind stress,wave-enhanced bottom stress,and wave radiation stress).Dike overflowing cases with different dike heights and dike breaking cases with different dike breach lengths were considered in the *** results highlight the necessity of incorporating wave effects in the accurate simulation of storm surge *** height significantly influences the magnitude and phase of the maximum inundation area in the dike overflowing cases,and dike breach length is an important factor impacting the magnitude of the maximum inundation area in the dike breaking *** study may serve as a useful reference for accurate coastal inundation simulation and risk assessment.

关键词： storm surge typhoon waves dike overflowing dike breaking inundation ADCIRC+SWAN

Chinese preparation Xuesaitong promotes the mobilization of bone marrow mesenchymal stem cells in rats with cerebral infarction

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Neural Regeneration Research 2016年第2期11卷 292-297页

作者： Jin-sheng Zhang Bao-xia Zhang mei-mei du Xiao-ya Wang Wei Li First Affiliated Hospital of Henan University of Traditional Chinese Medicine Zhengzhou Henan Province China Third Affiliated Hospital of Henan University of Traditional Chinese Medicine Zhengzhou Henan Province China

After cerebral ischemia, bone marrow mesenchymal stem cells are mobilized and travel from the bone marrow through peripheral circulation to the focal point of ischemia to initiate tissue regeneration. However, the number of bone marrow mesenchymal stem cells mobilized into peripheral circulation is not enough to exert therapeutic effects, and the method by which blood circulation is promoted to remove blood stasis influences stem cell homing. The main ingredient of Xuesaitong capsules is Panax notoginseng saponins, and Xuesaitong is one of the main drugs used for promoting blood circulation and removing blood stasis. We established rat models of cerebral infarction by occlusion of the middle cerebral artery and then intragastrically administered Xuesaitong capsules（20, 40 and 60 mg/kg per day） for 28 successive days. Enzyme-linked immunosorbent assay showed that in rats with cerebral infarction, middle- and high-dose Xuesaitong significantly increased the level of stem cell factors and the number of CD117-positive cells in plasma and bone marrow and significantly decreased the number of CD54-and CD106-positive cells in plasma and bone marrow. The effect of low-dose Xuesaitong on these factors was not obvious. These findings demonstrate that middle- and high-dose Xuesaitong and hence Panax notoginseng saponins promote and increase the level and mobilization of bone marrow mesenchymal stem cells in peripheral blood.

关键词： nerve regeneration Panax notoginseng saponin Xuesaitong bone marrow mesenchymal stem cell cerebral infarction mobilization peripheral circulation homing nerual regeneration

A sustained-release microcarrier effectively prolongs and enhances the antibacterial activity of lysozyme

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Journal of Environmental Sciences 2023年第7期129卷 128-138页

作者： mei du Jingzhang Liu Fengbang Wang Lei Bi Chunyan Ma Maoyong Song Guibin Jiang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of ScienceBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Bacterial infections have become a great threat to public health in recent years.A primary lysozyme is a natural antimicrobial protein;however,its widespread application is limited by its ***,we present a poly(N-isopropylacrylamide)hydrogel inverse opal particle(PHIOP)as a microcarrier of lysozyme to prolong and enhance the efficiency against *** PHIOP-based lysozyme(PHIOP-Lys)formulation is temperature-responsive and exhibits long-term sustained release of lysozyme for up to 16 *** shows a potent antibacterial effect toward both Escherichia coli and Staphylococcus aureus,which is even higher than that of free lysozyme in solution at the same ***-Lys were demonstrated to effectively inhibit bacterial infections and enhance wound healing in a full-thickness skin wound rat *** study provides a novel pathway for prolonging the enzymatic activity and antibacterial effects of lysozyme.

关键词： Bacterial infection Lysozyme Temperature-responsive Inverse opal particle Wound healing

Optimal concentration and time window for proliferation and differentiation of neural stem cells from embryonic cerebral cortex: 5% oxygen preconditioning for 72 hours

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Neural Regeneration Research 2015年第9期10卷 1516-1522页

作者： Li-li Yuan Ying-jun Guan Deng-dian Ma Hong-mei du Department of Histology and Embryology Academy of Basic Medicine Jining Medical University Department of Histology and Embryology Academy of Basic Medicine Weifang Medical University Department of Otorhinolaryngology Affiliated Hospital of Jining Medical University

Hypoxia promotes proliferation and differentiation of neural stem cells from embryonic day 12 rat brain tissue, but the concentration and time of hypoxic preconditioning are controversial. To address this, we cultured neural stem cells isolated from embryonic day 14 rat cerebral cortex in 5% and 10% oxygen in vitro. MTT assay, neurosphere number, and immunofluorescent staining found that 5% or 10% oxygen preconditioning for 72 hours improved neural stem cell viability and proliferation. With prolonged hypoxic duration （120 hours）, the proportion of apoptotic cells increased. Thus, 5% oxygen preconditioning for 72 hours promotes neural stem cell prolif- eration and neuronal differentiation. Our findings indicate that the optimal concentration and duration of hypoxic preconditioning for promoting proliferation and differentiation of neural stem cells from the cerebral cortex are 5% oxygen for 72 hours.

关键词： nerve regeneration brain injury neural stem cells low oxygen cerebral cortex apoptosis differentiation microtubule-associated protein 2 glial fibrillary acidic protein caspase-3 neuralregeneration