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Spin-Dependent Electron Properties of a Triple-Terminal Quantum Dot Structure

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Communications in Theoretical Physics 2009年第12期52卷 1117-1124页

作者： han Yu GONG wei-Jiang wei Guo-Zhu Department of Physics Liaoning University Shenyang 110036 China College of Sciences Northeastern University Shenyang 110004 China International Center for Material Physics Acadmia Sinica Shenyang 110015 China

Electron transport properties of a triple-terminal Aharonov-Bohm interferometer are theoretically *** applying a Rashba spin-orbit coupling to a quantum dot locally, we find that remarkable spin polarization comesabout in the electron transport process with tuning the structure parameters, i.e., the magnetic flux or quantum dotlevels. When the quantum dot levels are aligned with the Fermi level, there only appear spin polarization in thisstructure by the presence of an appropriate magnetic flux. However, in absence of magnetic flux spin polarization andspin separation can be simultaneously realized with the adjustment of quantum dot levels, namely, an incident electronfrom one terminal can select a specific terminal to depart from the quantum dots according to its spin state.

关键词： quantum dot electron transport Rashba interaction

Numerical simulation of coupling heat transfer and thermal stress for spent fuel dry storage cask with different power distribution and tilt angles

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Nuclear Science and Techniques 2023年第2期34卷 109-127页

作者： wei‑Hao Ji Jian‑Jie Cheng han‑Zhong Tao wei Li College of Urban Construction Nanjing Tech UniversityNanjing 211800China School of Energy Science and Engineering Nanjing Tech UniversityNanjing 211800China

Dry storage containers must be secured and reliable during long-term storage,and the effect of decay heat released from the internal spent fuel on the cask has become an important research *** this paper,a 3D computational fluid dynamics model is presented,and the accuracy of the calculation is verified,with computational errors of less than 6.2%.The thermal stress of the dry storage cask was estimated by coupling it with a transient temperature *** total power remained constant and adjusting the power ratio of the inner and outer zones had a small effect on the stress results,with a maximum equivalent stress of approximately 5.2 kPa,which occurred at the lower edge of the *** the case of tilt,the temperature gradient varied in a wavy distribution,and the wave crest moved from right to *** the tilt angle affects the air distribution in the annular gap,leading to the shell temperature being transformed,with a maximum equivalent stress of 202 MPa at the bottom of the ***,the equivalent stress in both cases was less than the yield stress(205 MPa).

关键词： Thermal stress CFD simulation Spent nuclear fuel Dry storage cask

Dual impact of superior SEI and separator wettability to inhibit lithium dendrite growth

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Rare Metals 2022年第2期41卷 353-355页

作者： wei-wei han Ryanda Enggar Anugrah Ardhi Gui-Cheng Liu Department of Physics Dongguk UniversitySeoul 04620Republic of Korea Center for Energy Storage Research Clean Energy InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea

Lithium metal battery(LMB)is regarded as the most potential energy storage ***,unfortunately,its large-scale commercial development is hindered due to the uncontrollable dendrite growth problem on its Li-metal *** utilization of electrolyte additives is one of the promising strategies to solve the problem mentioned *** electrolyte additive based on heptafluorobutyric anhydride(HFA)is used to solve the dendrite problem by forming robust inorganic-rich solid electrolyte interphase(SEI)and enhancing the separator wettability.

关键词： electrolyte lithium impact

Prediction of Long-Term Extreme Response of Fish Cage Using Environmental Contour Method

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China Ocean Engineering 2021年第3期35卷 332-343页

作者： BAI Xiao-dong GUO wei-wei YANG Can LUO han-bing State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Department of Naval Architecture and Ocean Engineering Tianjin UniversityTianjin 300072China China Water Resources Bei Fang Investigation Design and Research CO.LTDTianjin 300222China College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China

The fish cage design requires accurate predictions of long-term extreme loads and *** with the time-consuming full long-term analysis method integrating all the probability distribution of the short-term extremes,the environmental contour method gains much attention in predicting the long-term extreme values due to the less computational *** paper investigates the long-term extreme response of a fish cage using the environmental contour *** fish cage is numerically simulated based on the lumped-mass method and the curved beam *** on the one-dimensional(1D)and two-dimensional(2D)environmental contour,the extreme responses,including the surge and heave motions,mooring force,and vertical bending of the floater,are predicted for different return periods and compared with the full long-term analysis *** indicate that the 1D method greatly underestimates the extreme *** 2D environmental contour method with a higher percentile level,namely90%,provides reasonable estimations and seems to be suitable for the long-term value *** studies show that the mooring arrangement and the bending stiffness have great effects on the bending moment and the mooring force and the mooring line pre-tension has minor effects on the fish cage response.

关键词： fish cage long-term extreme value environmental contour method sensitivity analysis

weighted Probability Density Estimator with Updated Bandwidths

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Journal of Systems Science & Complexity 2024年第2期37卷 886-906页

作者： WU Yi YU wei WANG Xuejun PRAKASA rao B L S School of Big Data and Artificial Intelligence Chizhou UniversityChizhou 247000China School of Big Data and Statistics Anhui UniversityHefei 230601China CR rao Advanced Institute of Mathematics Statistics and Computer ScienceHyderabad 500046India

In this paper,the authors study a class of weighted version of probability density *** is shown that the weighted estimator contains some existing estimators of probability density,no matter they are recursive or *** statistical results including weak consistency,strong consistency,rate of strong consistency,and asymptotic normality are established under some mild ***,the random weighted estimator is also *** numerical simulations and a real data analysis are presented to study the numerical performances of the estimators.

关键词： Asymptotic normality consistency numerical simulation probability density real data analysis updated bandwidths weighted estimator

Aerodynamic design,analysis,and validation techniques for the Tianwen-1 entry module

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Astrodynamics 2022年第1期6卷 39-52页

作者： Qi Li wei rao Xiaoli Cheng Haogong wei Chuang Wang Jie Dong Beijing Space Vehicle Design Department China Academy of Space TechnologyBeijing 100094China China Academy of Aerospace and Aerodynamics Beijing 100074China

The clear differences between the atmosphere of Mars and the Earth coupled with the lack of a domestic research basis were significant challenges for the aerodynamic prediction and verification of *** addition,the Mars entry,descent,and landing(EDL)mission led to specific requirements for the accuracy of the aerodynamic deceleration performance,stability,aerothermal heating,and various complex aerodynamic coupling problems of the entry *** study analyzes the key and difficult aerodynamic and aerothermodynamic problems related to the Mars EDL ***,the study process and results of the design and optimization of the entry module configuration are presented along with the calculations and experiments used to obtain the aerodynamic and aerothermodynamic characteristics in the Martian *** addition,the simulation and verification of the low-frequency free oscillation characteristics under a large separation flow are described,and some special aerodynamic coupling problems such as the aeroelastic buffeting response of the trim tab are ***,the atmospheric parameters and aerodynamic characteristics obtained from the flight data of the Tianwen-1 entry module are compared with the design *** data obtained from the aerodynamic design,analysis,and verification of the Tianwen-1 entry module all meet the engineering *** particular,the flight data results for the atmospheric parameters,trim angles of attack,and trim axial forces are within the envelopes of the prediction deviation zones.

关键词： Mars entry,descent,and landing(EDL) design and optimization of the entry module configuration calculations and experiments of aerodynamic and aerothermodynamic characteristics low-frequency free oscillation under large separation flow special aerodynamic coupling problems flight data

A Step Forward toward Effectively Using Hyperspectral IR Sounding Information in NWP

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Advances in Atmospheric Sciences 2017年第11期34卷 1263-1264页

作者： Jun LI wei han Numerical Weather Prediction Center China Meteorological Administration Beijing 100081 China

Satellite-based atmospheric sounding measurements with high spectral resolution or from hyperspectral infrared （IR） sounders are important global observations for improving weather forecasts through assimilating the... 详细信息

关键词： In A Step Forward toward Effectively Using Hyperspectral IR Sounding Information in NWP

Lock-in phenomenon of tip clearance flow and its influence on aerodynamic damping under specified vibration on an axial transonic compressor rotor

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Chinese Journal of Aeronautics 2022年第3期35卷 185-200页

作者： Le han Dasheng wei Yanrong WANG Mingchang FANG School of Energy and Power Engineering Beihang UniversityBeijing 100083China Collaborative Innovation Center for Advanced Aero-Engine Beijing 100083China

In this study,the lock-in phenomenon of Tip Clearance Flow(TCF)instabilities and their relationship to blade vibration are investigated numerically on an axial transonic rotor with a large tip *** capabilities of simulating instability flow and lock-in phenomenon are verified on a transonic rotor and a NACA0012 airfoil by comparing with the test data,*** lock-in phenomenon is first numerically confirmed that may occur to TCF instabilities when its frequency is close to the blade vibration *** lock-in region becomes wider with the vibration amplitude increasing,and it is also affected by modal *** the rotor at the simulation conditions in this study,the bending mode results in a wider lock-in region than the torsional *** the lock-in region,the phase difference between the Tip Clearance Vortex(TCV)and the blade vibration changes with the flow condition and the frequency ratio of the blade vibration and the TCV *** frequency of the TCV instabilities reduces with the mass flow ***,reducing mass flow and increasing frequency ratio have similar effects on the TCV phase,which causes a significant variation on the unsteady pressure amplitude in the blade tip ***,the aerodynamic damping changes significantly with the TCV *** aerodynamic damping displays a nonlinear relationship with the vibration amplitude,and it changes from negative to positive with the vibration amplitude increasing at the same frequency *** negative damping is mainly provided by the tip area of the *** unlocked conditions,the period of the TCF instabilities fluctuates over time,and it cannot be directly separated by their frequency *** Blade Phase Angle(IBPA)also has an important influence on the feature of the TCV *** occurrence of frequency lock-in also requires“appropriate”*** the examined working conditions,the frequency lock-in occurs under 0 ND(Nodal Diameter),but not un

关键词： Aerodynamic damping Inter blade phase angle Lock-in Specified blade vibration Tip clearance flow instabilities

Pottery lipid analysis at the Shangzhai site,Beijing,and its implication for subsistence strategy

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Science China Earth Sciences 2023年第8期66卷 1789-1797页

作者： Nanning LYU Tao WANG Jincheng YU Huiyun rao Bin han Yimin YANG Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China Department of Archaeology and Anthropology University of Chinese Academy of SciencesBeijing 100049China School of History Capital Normal UniversityBeijing 100048China Beijing Institute of Archaeology Beijing 100009China

As the crossroads of prehistoric cultures,the Beijing region is an important area for studying the exchange of prehistoric culture and the spread of millet *** millet remains have been found in the Donghulin site during the Early Neolithic Age,there is little millet remains during the Middle and Late Neolithic Age,so there is a gap of approximately2,000 years since the time of the Donghulin *** Shangzhai site is located in the Pinggu Basin in eastern Beijing,and it has a large time span with sequential strata;however,there are few large animals and plant remains found at this site,thus the subsistence strategy of ancient people remains *** this study,the absorbed lipids of pottery sherds unearthed in the Neolithic cultural layer of the Shangzhai site were extracted and *** results show that these potteries were used to process millet,the meat of terrestrial non-ruminants and wild ruminants,and dairy of wild ruminants,providing new insights for the subsistence strategy and the development of millet agriculture in the Middle and Late Neolithic Age of *** addition,the food processing in pottery may be an internal heating method,such as stone boiling.

关键词： Shangzhai site Millet agriculture Subsistence strategy Pottery lipid analysis Stone boiling