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| 1 | A transient bulk flow model with circular whirl motion for rotordynamic coefficients of annular seals显示文摘Bulk flow model with perturbation simplification has been used to calculate rotordynamic coefficients in annular seals which have significant influences on the dynamic behavior of rotors in turbomachinery. In this work, a transient bulk flow model with arbitrary rotor motion is developed, and the boundary conditions and friction factor in the model are calibrated with steady Computational Fluid Dynamics(CFD) analysis. The numerical solution scheme is developed based on the finite element method to obtain the transient reaction force in the seal clearance. With a periodic circular rotor orbit, the transient forces at multiple whirling frequencies are used to evaluate the rotordynamic coefficients. The leakage flowrate of CFD analysis has good agreement with experimental results and the calibrated parameters in bulk flow model are dependent on operating conditions. Although CFD calibration improves the accuracy of the perturbed bulk flow model, the direct damping is overestimated and the cross-coupled damping is underestimated. Compared with the perturbed model, the predictions of the transient bulk flow model are more agreeable with the experiment. | Peng XIA Zhansheng LIU Xiangyu YU Jingming ZHAO | 2018 | Chinese Journal of Aeronautics2018，31，5： | 7 |
| 2 | Intelligent Task Offloading and Collaborative Computation in Multi-UAV-Enabled Mobile Edge Computing显示文摘This article establishes a three-tier mobile edge computing(MEC) network, which takes into account the cooperation between unmanned aerial vehicles(UAVs). In this MEC network, we aim to minimize the processing delay of tasks by jointly optimizing the deployment of UAVs and offloading decisions,while meeting the computing capacity constraint of UAVs. However, the resulting optimization problem is nonconvex, which cannot be solved by general optimization tools in an effective and efficient way. To this end, we propose a two-layer optimization algorithm to tackle the non-convexity of the problem by capitalizing on alternating optimization. In the upper level algorithm, we rely on differential evolution(DE) learning algorithm to solve the deployment of the UAVs. In the lower level algorithm, we exploit distributed deep neural network(DDNN) to generate offloading decisions. Numerical results demonstrate that the two-layer optimization algorithm can effectively obtain the near-optimal deployment of UAVs and offloading strategy with low complexity. | Jingming Xia Peng Wang Bin Li Zesong Fei | 2022 | China Communications2022，19，4： | 3 |
| 3 | Co-varying temperatures at 200 hPa over the Earth’s three poles显示文摘The Earth’s three poles,the North Pole,South Pole,and Third Pole(i.e.,the Tibetan Plateau and its surroundings),hold the largest amount of fresh water on Earth as glaciers,sea ice,and snow.They are sensitive to climate change.However,the linkages between climate variations of the three poles,particularly between the South Pole and Third Pole,remain largely unknown.The temperatures at 200 hPa over the three poles are the highest in the summer and are less affected by surface conditions,which could reflect large-scale dynamic linkages.Temperatures at 200 hPa peak the three poles during their respective hemispheric summer and exhibit in-phase variations on interdecadal timescales(10–100 years).The 200 hPa temperatures over the North Pole and South Pole were significantly correlated with the Brewer-Dobson circulation(BDC),which transports stratospheric ozone poleward,heating the air at 200 hPa.Tropopause warming over the Third Pole was found to enhance the poleward BDC,particularly to the South Pole,linking the Third Pole’s climate to the other two poles.Additionally,the Interdecadal Pacific Oscillation(IPO)also exhibits links with the 200 hPa temperatures of the three poles. | Keyan FANG Peng ZHANG Jingming CHEN Deliang CHEN | 2021 | Science China Earth Sciences2021，64，2： | 1 |
| 4 | Preparation and performance of antifouling PVC42PVC blend ultrafiltration membranes 显示文摘 | L1U Jiazhen SU Yanlei PENG Jingming | 2012 | Ind Eng Chem Res2012，51，24： | 1 |
| 5 | Preparation and characterization of zwitterionic surfactant-modified montmorillonites显示文摘 | Jianxi Zhu Yanhong Qing Tong Wang Runliang Zhu Jingming Wei Qi Tao Peng Yuan Hongping He | 2011 | Journal of Colloid And Interface Science2011，，2： | 1 |
| 6 | Synthesis and biological evaluation of phosphorylated flavonoids as potent and selective inhibitors of cholesterol esterase显示文摘 | Yingling Wei Ai-Yun Peng Bo Wang Lin Ma Guoping Peng Yidan Du Jingming Tang | 2014 | European Journal of Medicinal Chemistry2014，，： | 1 |
| 7 | Ethylene thiourea exposure induces neurobehavioral toxicity in zebrafish by disrupting axon growth and neuromuscular junctions显示文摘Ethylene thiourea(ETU)converted from ethylene bisdithiocarbamate(EBDC)fungicides has aroused great concern because of its prevalence and harmful effects.Although ETU-induced neurotoxicity has been reported,the potential mechanisms remain unclear.This study provided insights into its neurotoxic effects at environmentally relevant concentrations in zebrafish.Our findings showed that embryonic exposure to ETU decreased the hatch rate and delayed somite development.Furthermore,ETU treatment significantly reduced the dark velocity in the locomotion assay.The upregulated tendency of the mitogen-activated protein kinases(MAPK)pathway(mknk1,atf4,mapkapk3)screened by transcriptome analysis implied motor neuron degeneration,which was validated by subsequent morphological observation,as axon length and branches were truncated in the 62.5μg/L ETU group.However,although the rescue experiment with a p38 MAPK inhibitor(SB203580)successfully ameliorated axon degeneration,it failed to reverse the locomotion behaviors.Further exploration of transcriptome data revealed the varied expression of presynaptic scaffold protein-related genes(pcloa,pclob,bsna),whose downregulation might impair the neuromuscular junction(NMJ).Therefore,we reasonably suspected that ETU-induced neurobehavioral deficits might result from the combined effects of the MAPK pathway and presynaptic proteins.Considering this,we highlighted the necessity to take precautions and early interventions for susceptible ETU-exposed populations. | Jingming Wang Zhiquan Yu Yongfeng Wang Yuanyao Chen Lin Xiao Yanjun Zong Qiyuan Feng Lianqi Peng Huiping Zhang Chunyan Liu | 2024 | Journal of Environmental Sciences2024，，3： | 0 |
| 8 | Research on the Practical Path of Collaborative Innovation Talent Training in Supply-Side Applied Undergraduate Colleges显示文摘The cultivation of supply-side collaborative innovation talents mainly focuses on four elements:labor,capital,technology,and system.The improvement of these four elements is essentially a long-term process,which determines the potential growth rate in the medium and long term.In this paper,we analyzed the current situation,put forward two major problems,the low degree of specialization and insufficient participation,and focus on the research on the practical path of collaborative innovation talent training in applied undergraduate colleges from the perspective of the system. | Min Peng Jingming Xie Maohua Xiong Yunxiang Liu Guangzhou | 2023 | Journal of Contemporary Educational Research2023，7，6： | 0 |
| 9 | Artificial Intelligence Education in Primary and Secondary Schools from the Perspective of Thinking Quality显示文摘With the vigorous development of social economy in China,various advanced technologies and equipment have emerged,among which artificial intelligence(AI)has rapidly developed and achieved remarkable results when applied to many fields.Therefore,leaders and teachers in primary and secondary schools should pay more attention to AI education and explore effective measures to optimize the effectiveness of this education.Among them,carrying out artificial intelligence education and teaching from the perspective of thinking quality,with an aim to improve students’technical ability and effectively cultivate their thinking skills,may improve students’learning efficiency and teachers’teaching efficiency.How to carry out AI education from the perspective of thinking quality is an important issue that teachers need to address urgently.Through in-depth research,we focus on this issue,in hope to benefit primary and secondary school teachers. | Min Peng Jingming Xie Maohua Xiong Yunxiang Liu | 2023 | Journal of Contemporary Educational Research2023，7，4： | 0 |
| 10 | Establishment of a sediment transport capacity equation on loessal slope via experimental investigation显示文摘Areliable sediment transport capacity function provides response against challenges of soil erosion prediction on the Loess Plateau of China.The popular sediment transport capacity functions are questionable on loess slopes because the experimental conditions from which they were derived,like bed materials,gentle slopes,and surface roughness,are different from soil erosion processes on the loess slopes.Due to the foregoing uncertainty,a suitable sediment transport capacity function was developed based on a flume experiment investigation.The erodible bed experiment was implemented for five unit width discharges(1.3×10^(-4)-3.3×10^(-4)m^(2)/s)and ten slopes(5.2%-57.7%).The selected sediment transport capacity equations were tested in an applicability evaluation.The results of this evaluation found that the Govers(1990)function had the best performance(P.O._(0.5-2.0)=76%,R^(2)=0.93,RMSE=0.03 kg/(m·s)),followed by the Yalin(1963)function(P.O._(0.5-2.0)=80%,R^(2)=0.81,RMSE=0.05 kg/(m·s)),and finally by the Low(1989)function(P.O._(0.5-2.0)=72%,R^(2)=0.79,RMSE=0.04 kg/(m·s)),where P.O._(0.5-2.0)is the percentage of estimated values with logarithmic discrepancies with the measured value between 0.5 and 2.0;R2is the coefficient of determination and RMSE is the roof mean squares error.The cohesive sediment incipient motion velocity is introduced into the Govers(1990)function,and the sediment particle parameter is determined from measured experimental data.The developed sediment transport capacity equation has good performance with predicted values corresponding to measured values(P.O._(0.5-2.0)=98%,R^(2)=0.98,RMSE=0.006 kg/(m·s)).The research results provide an improved sediment transport capacity function on the basis of experiments for steep loessal slopes. | Tian Wang Jingsi Li Jingming Hou Peng Li Shengdong Cheng Feng Wang Wen Wang Zhanbin Li Reinhard Hinkelmann | 2023 | International Journal of Sediment Research2023，38，2： | 0 |
| 11 | Hydrological and sediment connectivity under freeze-thaw meltwater compound erosion conditions on a loessal slope显示文摘Freeze-thaw processes can influence hydrology,soil erosion,and morphological development by altering the connectivity between active pathways of water and sediment transport.Concentrated flow experi-ments were conducted involving frozen,shallow thawed,and unfrozen soil slopes under 1,2,and 4 L/min runoff rates at a temperature of approximately 5℃.In this study,hydrological connectivity was analysed via the simplified hydrological curve and relative surface connection function.Sediment con-nectivity was analysed via the sediment structure connectivity and sediment functional connectivity.Results indicated that hydrological connectivity was greatest on frozen slopes(FS),followed by shallow thawed slopes(STS),and unfrozen slopes(UFS)given a constant flow rate.Hydrological connectivity increased with increasing runoff rate for each freeze-thaw condition.Freezing condition and runoff rate exhibited a positive response to the hydrological connectivity.Sediment structure connectivity increased with increasing runoff rate for each slope condition.The ordering of sediment structure connectivity across freeze-thaw condition was that FS was greater than STS while STS was greater than UFS inde-pendent of flow rate.Sediment functional connectivity included longitudinal,lateral,and vertical con-nectivity components.Sediment longitudinal and vertical connectivity indicated a trend of first increasing and then decreasing under the different runoff rates and freeze-thaw conditions.For a given runoff rate,the ordering of sediment longitudinal and vertical connectivity across freeze-thaw condition was that FS was greater than STS while STS was greater than UFS.Sediment lateral connectivity exhibited a trend of first decreasing and then stabilizing.The ordering of sediment lateral connectivity across freeze-thaw condition was that UFS was greater than STS while STS was greater than FS.FS could more easily reach longitudinal and vertical penetration.Sediment longitudinal and vertical connectivity rates demonstrated increasing trends with increasing runoff rate after runoff generation stabilization and gradually approached unity.This research further improves our understanding of the hydrological and erosional mechanisms of meltwater and the generation of flooding in frozen soil conditions. | Tian Wang Jingsi Li Jingming Hou Yongyong Ma Peng Li Yu Tong Jing Li Zhanbin Li | 2023 | International Soil and Water Conservation Research2023，11，2： | 0 |
| 12 | Transport mechanism of eroded sediment particles under freeze-thaw and runoff conditions显示文摘Hydraulic erosion associated with seasonal freeze-thaw cycles is one of the most predominant factors,which drives soil stripping and transportation.In this study,indoor simulated meltwater erosion experiments were used to investigate the sorting characteristics and transport mechanism of sediment particles under different freeze-thaw conditions(unfrozen,shallow-thawed,and frozen slopes)and runoff rates(1,2,and 4 L/min).Results showed that the order of sediment particle contents was silt>sand>clay during erosion process on unfrozen,shallow-thawed,and frozen slopes.Compared with original soils,clay and silt were lost,and sand was deposited.On unfrozen and shallow-thawed slopes,the change of runoff rate had a significant impact on the enrichment of clay,silt,and sand particles.In this study,the sediment particles transported in the form of suspension/saltation were 83.58%–86.54%on unfrozen slopes,69.24%–84.89%on shallow-thawed slopes,and 83.75%–87.44%on frozen slopes.Moreover,sediment particles smaller than 0.027 mm were preferentially transported.On shallow-thawed slope,relative contribution percentage of suspension/saltation sediment particles gradually increased with the increase in runoff rate,and an opposite trend occurred on unfrozen and frozen slopes.At the same runoff rate,freeze-thaw process had a significant impact on the relative contribution percentage of sediment particle transport via suspension/saltation and rolling during erosion process.The research results provide an improved transport mechanism under freeze-thaw condition for steep loessal slopes. | WANG Tian LI Peng HOU Jingming TONG Yu LI Jing WANG Feng LI Zhanbin | 2022 | Journal of Arid Land2022，14，5： | 0 |
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