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AERODYNAMIC OPTIMIZATION DESIGN OF LOW ASPECT RATIO TRANSONIC TURBINE STAGE

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Chinese Journal of Mechanical Engineering 2006年第4期19卷 500-504页

作者： song liming LI Jun FENG Zhenping Institute of Turbomachinery Xi＇an Jiaotong University Xi＇an 710049 China

The advanced optimization method named as adaptive range differential evolution （ARDE） is developed. The optimization performance of ARDE is demonstrated using a typical mathematical test and compared with the standard genetic algorithm and differential evolution. Combined with parallel ARDE, surface modeling method and Navier-Stokes solution, a new automatic aerodynamic optimization method is presented. A low aspect ratio transonic turbine stage is optimized for the maximization of the isentropic efficiency with forty-one design variables in total. The coarse-grained parallel strategy is applied to accelerate the design process using 15 CPUs. The isentropic efficiency of the optimum design is 1.6% higher than that of the reference design. The aerodynamic performance of the optimal design is much better than that of the reference design.

关键词： Turbine stage Adaptive range differential evolution (ARDE)Aerodynamic optimization Coarse-grained parallel strategy

Relationship Between the Spatiotemporal Distribution of Dominant Small Pelagic Fishes and Environmental Factors in Mauritanian Waters

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Journal of Ocean University of China 2020年第2期19卷 393-408页

作者： EBANGO NGANDO Narcisse song liming CUI Hongxing XU Shuangquan College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China National Engineering Research Center for Oceanic Fisheries Shanghai Ocean UniversityShanghai 201306China The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of EducationShanghai Ocean UniversityShanghai 201306China Collaboration Innovation Center for National Distant-Water Fisheries Shanghai 201306China

The relationship between the spatiotemporal distribution of three dominant small pelagic fishes,including chub mackerel(Scomber japonicus),horse mackerel(Trachurus trecae)and round sardinella(Sardinella aurita),and the environmental factors in Mauritanian waters were analyzed by using 4 years of logbook data of commercial purse seine fisheries to improve the efficiency of fishery and management of sustainable exploitation.A Tweedie-generalized additive model(GAM)of 8-day average catches and the monthly geostatistical analysis of daily catches were used in this study to analyze the influence of environmental factors on catch per unit of effort(CPUEs)and to map the spatial distribution of three mixed dominant small pelagic fishes,respectively.A 10'×10' grid was used,and environmental factors were processed from remote sensing,including 8-day average sea surface temperature(SST),the nearest distance between SST fronts and CPUE position(Df),chlorophyll-a(Chl-a)concentration,salinity,and eddy kinetic *** showed that 1)the distribution of three dominant small pelagic fishes might be related to the intensity of upwelling in Mauritanian waters;2)oceanic fronts might play a key role in the ecology of chub mackerel,horse mackerel,and round sardinella;3)Chl-a concentration might be associated with the feeding grounds of chub mackerel;4)the target species distribution appeared sensitive to gradient changes in the amount of salinity;5)three zones(northern,central,and southern)with variable abundances were delineated;and 6)a high concentration of the center of gravity in the central zone might be related to the strong upwelling of nutrient-rich *** study can provide new insights to enhance the fishery efficiency and sustainable exploitation management of purse seiners in certain area off Mauritania.

关键词： aggregation environmental factors small pelagic fish light purse seiner Mauritanian waters

Cell-cycle dependent nuclear gene delivery enhances the effects of E-cadherin against tumor invasion and metastasis

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Signal Transduction and Targeted Therapy 2023年第6期8卷 3039-3054页

作者： Liting Xie Jieqiong Wang liming song Tianan Jiang Fei Yan Department of Ultrasound The First Affiliated HospitalZhejiang University School of MedicineHangzhou310058China CAS Key Laboratory of Quantitative Engineering Biology Shenzhen Institute of Synthetic BiologyShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China Department of Orthopedics Zhujiang HospitalSouthern Medical UniversityGuangzhou510280China

Gene delivery is the process by which foreign DNA is transferred to host cells,released from intracellular vesicles,and transported to the nuclei for *** process is frequently inefficient and difficult to control *** developed a gene delivery strategy that uses ultrasound to directly deliver plasmid DNA into nuclei via gas vesicles(GVs)-based intracellular ***-binding GVs can be taken up by cells and cause intracellular cavitation when exposed to acoustic irradiation and delivering their pDNA payloads into ***,GVs can remain stable in the cytoplasm in the absence of acoustic irradiation,allowing for temporally controlled nuclear gene *** were able to achieve spatiotemporal control of E-cadherin nuclear gene delivery in this manner,demonstrating its efficacy in tumor invasion and metastasis ***,we discovered that nuclear gene delivery of E-cadherin during the G2/M phase of the cell cycle in C6 tumor cells inhibited tumor invasion and metastasis more effectively than during the G1 and S *** gene delivery of E-cadherin at the G2/M phase resulted in significantly lower expression of Fam50a,which reduced Fam50a/Runx2 interaction and led to reduced transactivation of MMP13,an important factor for epithelial-mesenchymal transition,as observed in a molecular mechanism ***,using remote acoustic control of intracellular cavitation of pDNA-GVs,we developed a high spatiotemporally controllable gene delivery strategy and achieved stronger tumor invasion and metastasis inhibition effects by delivering the E-cadherin gene at the G2/M phase.

关键词： invasion metastasis inhibited

Dynamic Simulation of Pelagic Longline Retrieval

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Journal of Ocean University of China 2019年第2期18卷 455-466页

作者： song liming QI Yukun LI Jie SHEN Zhibin ZHANG Xinfeng SHEN Xi College of Marine Sciences Shanghai Ocean University National Engineering Research Centre for Oceanic Fisheries Shanghai Ocean University Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources (Shanghai Ocean University) Ministry of Education Collaboration Innovation Center for National Distant-Water Fisheries

To improve fishing gear efficiency, it is important to understand the interactions among sea current, fishing vessel, line hauler, and catches during pelagic longline gear retrieval. In this study, fishing gear configuration parameters, operational parameters, and 3 D ocean current data were collected from Indian Ocean. Dynamic models of pelagic longline gear retrieval were built using the lumped mass method and solved using the Euler-Trapezoidal method. From the results, the pulling force of line hauler exerted on the gear was 2800–3600 N. There were no significant differences(P > 0.05) between the time of the hook retrieval measured at sea and that obtained from the simulation. The absolute values of the movement velocity at representative nodes along the X, Y, and Z axes were 0.01–25.5 m s^(-1). These results suggest that the dynamic model of longline fishing gear retrieval can be used to analyze the interactions among sea current, fishing vessel, line hauler, longline gear, and catches, and to acquire the basic data for optimizing the design of the line hauler. Moreover, the model can serve as a reference to study the hydrodynamic performance of other fishing gears during the hauling process.

关键词： pelagic longline retrieval dynamic simulation visualization

The Relationship Between Fat Content and Biological Parameters of Bigeye Tuna(Thunnus obseus) in the Western Central Indian Ocean

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Journal of Ocean University of China 2016年第5期15卷 853-860页

作者： song liming SHEN Zhibin LI Jie LI Dongjing LI Yuwei College of Marine Sciences Shanghai Ocean University Shanghai 201306 P. R. China National Engineering Research Center for Oceanic Fisheries Shanghai Ocean University Shanghai 201306 P. R. China The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of Education Shanghai Ocean University Shanghai 201306 P. R. China Collaboration Innovation Center for National Distant-Water Fisheries Shanghai 201306 P. R. China

Comparing fat content with physiological status can throw light on the reproduction and feeding behavior of the fish. The biological data of 586 bigeye tuna were collected from the longline fishery in the waters of Western Central Indian Ocean from November, 2012 to March, 2013. The spatial or temporal distribution of the fat content, and the relationships of fat content with gender, round weight, gonadal maturity and fork length were analyzed. A generalized additive model(GAM) was used to analyze the relationships between fat content and fork length(FL), gonadosomatic index(GSI), condition factor(K), and somatic index(SI). Results showed that: 1) the fat content of bigeye tuna was in the range of 3.1%–27.1% with the average 12.8%; 2) there were no significant geographical differences of average fat content(P > 0.05) among 1? squares in general; 3) there were no significant differences(P > 0.05) of the fat content for different genders, months, or gonad maturity stages; 4) there was an extremely significant correlation(P = 0.000) between fat content and FL and GSI. There was no significant correlation(P = 0.051) between fat content and K. There was a significant correlation(P = 0.003) between fat content and SI. The results of this study suggest that the fat content of the matured fish was relatively stable. The survey area was in a spawning region, and the survey period was the spawning season for bigeye tuna.

关键词： maturity Indian season somatic physiological maturation extremely migration length feeding

Modeling the Hook Depth Distribution of Pelagic Longlining in the Equatorial Area of Indian Ocean

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Journal of Ocean University of China 2012年第4期11卷 547-556页

作者： song liming LI Jie GAO Panfeng ZHOU Ji XU Liuxiong National Engineering Research Centre for Oceanic Fisheries ShanghaiOcean UniversityShanghai 201306P.R.China Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources of Chinese Ministry of Education College of Marine SciencesShanghai Ocean UniversityShanghai 201306P.R.China College of Marine Sciences Shanghai Ocean UniversityShanghai 201306P.R.China Lianyunggang Fishery Detachment Lianyunggang 222004P.R.China

A survey was conducted in the equatorial area of Indian Ocean for a better understanding of the dynamics of hook depth distribution of pelagic longline fishery. We determined the relationship between hook depth and vertical shear of current coefficieney, wind speed, hook position code, sine of wind angle, sine of angle of attack and weight of messenger weight. We identified the hook depth models by the analysis of covariance with a general linear model. The results showed that the wind effect on the hook depth can be ignored from October to November in the survey area; the surface current effect on the hook depth can be ignored; the equato- rial undercurrent is the key factor for the hook depth in Indian Ocean; and there is a negative correlation between the hook depth and vertical shear of current and angle of attack. It was also found that the deeper the hook was set, the higher hook depth shoaling was. The proposed model improves the accuracy of the prediction of hook depth, which can be used to estimate the vertical distribution of pelagic fish in water column.

关键词： hook depth longline temperature-depth-recorder equatorial area the Indian Ocean

Effects of Different Spatial Resolutions on Prediction Accuracy of Thunnus alalunga Fishing Ground in Waters Near the Cook Islands Based on Long Short-Term Memory(LSTM)Neural Network Model

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Journal of Ocean University of China 2023年第5期22卷 1427-1438页

作者： XU Hui song liming ZHANG Tianjiao LI Yuwei SHEN Jieran ZHANG Min LI Kangdi College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China National Engineering Research Center for Oceanic Fisheries Shanghai 201306China College of Information Technology Shanghai Ocean UniversityShanghai 201306China Liancheng Overseas Fishery(Shenzhen Group) Shenzhen 518035China College of Information Engineering Shanghai Maritime UniversityShanghai 200135China

Albacore tuna(Thunnus alalunga)is one of the target species of tuna longline fishing,and waters near the Cook Islands are a vital albacore tuna fishing *** environmental data are usually presented with different spatial resolutions,which leads to different results in tuna fishery *** on the impact of different spatial resolutions on the prediction accuracy of albacore tuna fishery to select the best spatial resolution can contribute to better management of albacore tuna *** nominal catch per unit effort(CPUE)of albacore tuna is calculated according to vessel monitor system(VMS)data collected from Chinese distantwater fishery enterprises from January 1,2017 to May 31,2021.A total of 26 spatiotemporal and environmental factors,including temperature,salinity,dissolved oxygen of 0–300 m water layer,chlorophyll-a concentration in the sea surface,sea surface height,month,longitude,and latitude,were selected as *** temporal resolution of the variables was daily and the spatial resolutions were set to be 0.5°×0.5°,1°×1°,2°×2°,and 5°×5°.The relationship between the nominal CPUE and each individual factor was analyzed to remove the factors irrelavant to the nominal CPUE,together with a multicollinearity diagnosis on the factors to remove factors highly related to the other factors within the four spatial *** relationship models between CPUE and spatiotemporal and environmental factors by four spatial resolutions were established based on the long short-term memory(LSTM)neural network *** mean absolute error(MAE)and root mean square error(RMSE)were used to analyze the fitness and accuracy of the models,and to determine the effects of different spatial resolutions on the prediction accuracy of the albacore tuna fishing *** results show the resolution of 1°×1°can lead to the best prediction accuracy,with the MAE and RMSE being 0.0268 and 0.0452 respectively,followed by 0.5°×0.5°,2°×2°and 5°×5°with declining pred

关键词： albacore tuna fishing ground prediction accuracy VMS spatial resolution LSTM the Cook Islands

X-Ray Fine Structure of a Limb Solar Flare Revealed by Insight-HXMT,RHESSI and Fermi

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Research in Astronomy and Astrophysics 2022年第5期22卷 47-55页

作者： Ping Zhang Wei Wang Yang Su Shuangnan Zhang liming song Fangjun Lu Shu Zhang Department of Physics and Technology Wuhan UniversityWuhan 430072China WHU-NAOC Joint Center for Astronomy Wuhan UniversityWuhan 430072China Purple Mountain Observatory of the Chinese Academy of Sciences Nanjing 210023China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

We conduct a detailed analysis of an M1.3 limb flare occurring on 2017 July 3,which have the X-ray observations recorded by multiple hard X-ray telescopes,including Hard X-ray Modulation Telescope(Insight-HXMT),Ramaty High Energy Solar Spectroscopic Imager(RHESSI),and the Fermi Gamma-ray Space Telescope(Fermi).Joint analysis has also used the extreme ultraviolet(EUV)imaging data from the Atmospheric Imaging Assembly(AIA)aboard the Solar Dynamic *** hard X-ray spectral and imaging evolution suggest a lower corona source,and the non-thermal broken power law distribution has a rather low break energy~15 *** EUV imaging shows a rather stable plasma configuration before the hard X-ray peak phase,and accompanied by a filament eruption during the hard X-ray flare peak *** X-ray image reconstruction from RHESSI data only shows one foot point *** also determined the DEM for the peak phase by SDO/AIA *** integrated EM beyond 10 MK at foot point onset after the peak phase,while the>10 MK source around reconnection site began to *** evolution of EM and hard X-ray source supports lower corona plasma heating after non-thermal energy *** combination of hard X-ray spectra and images during the limb flare provides the understanding on the interchange of non-thermal and thermal energies,and relation between lower corona heating and the upper corona instability.

关键词： Sun flares-Sun corona-Sun X-rays-gamma-rays-plasmas-radiation mechanisms non-thermal-radiation mechanisms thermal

Study on direct point spread function measurement of capillary plate collimators with divergent X-ray beams

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Radiation Detection Technology and Methods 2023年第3期7卷 321-336页

作者： Tianming Li Tao Luo Yupeng Xu Huilin He liming song Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China

Purpose The Filed of View(FOV)of eXTP/LAD is limited by lead-glass capillary plate collimators placed in front of the Silicon Drift Detectors(SDDs)for reducing the background contamination caused by the photons of Cosmic X-ray Background(CXB)leaking from outside the *** core quality parameters of lead-glass capillary plate collimators are Open Area Ratio(OAR)and *** performance of lead-glass capillary plate collimators is determined by its design specification such as pore-to-pore misalignment,pore perpendicularity with collimator surface and pore *** the design specification is the result of a large number of micropores,we use the full width at half maximum(FWHM)and peak value of point spread function(PSF)to characterize the capillary plate collimator *** order to quickly evaluate the performances of collimators,we developed a direct PSF measurement method using divergent *** In this paper,the simulation package of the divergent beamsmeasurement setup is developed based on *** simulation parameters of scintillator absorption length are corrected by experimental *** simulate the PSF of collimators with different distribution of pore diameter and misalignment by parallel beams and divergent *** comparing the peak value and FWHM of collimators PSF,the feasibility in replacing parallel beams measurement with divergent beams measurement is *** It is verified that the influence of the geometric size of 33μm radius of the micro-focus of X-ray tube can be *** results show that the FWHM of collimators is increased with error root mean square error(RMS)of the distribution of collimators pore diameter and pore inclination *** peak value of PSF is mainly influenced by pore non-parallelism of the pores,and it decreases with an increase in pore inclination *** of parallel beams PSF and divergent beams PSF shows well consistency of peak value and FWHM of ***,the peak value of

关键词： Geant4 EXTP/LAD Capillary plate collimators Divergent X-ray beams measurment