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Modeling Morning Commute with Different Kinds of Activities Based on Bottleneck Model

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Journal of Systems Science and Systems Engineering 2023年第4期32卷 444-461页

作者： qing dai Jiajia Zhang Zhengkui Lin School of Management Science and Engineering Dongbei University of Finance and EconomicsDalian116025China School of Maritime Economics and Management Dalian Maritime UniversityDalian116026China

Morning commute problem has always been concerned by researchers in transportation research *** the bottleneck existing in the road network between home and school,this paper studies the household travel with different kinds of activities,i.e.,home-school-home trip and home-school-workplace *** just send their children to school and then go home,which is named school *** need to send their children to school firstly and then go to work,which is named household ***,according to the proportions of two types of travelers and school-work start time difference,the possible equilibrium cases are solved and the conditions for the occurrence of each case are *** from the traditional bottleneck model with a unique equilibrium traffic pattern,the mixed travel case has six possible equilibrium traffic ***,the cost of traveler is analyzed for all possible equilibrium traffic *** shows that equilibrium trip costs of two types of travelers are more sensitive to the number of travelers in that class than the number in another class in all possible equilibrium ***,the influence of school-work start time difference on the total travel cost is *** shows that the total system travel cost can be reduced by appropriately adjusting the difference of school-work start time.

关键词： Morning commute bottleneck model household travel school travel

Microstructure and properties of nano-laminated Y_(3)Si_(2)C_(2) ceramics fabricated via in situ reaction by spark plasma sintering

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Journal of Advanced Ceramics 2021年第3期10卷 578-586页

作者： Lin-Kun SHI Xiaobing ZHOU Jian-qing dai Ke CHEN Zhengren HUANG qing HUANG Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China

A nano-laminated Y_(3)Si_(2)C_(2) ceramic material was successfully synthesized via an in situ reaction between YH_(2)and SiC using spark plasma sintering technology.A MAX phase-like ternary layered structure of Y_(3)Si_(2)C_(2) was observed at the atomic-scale by high resolution transmission electron *** lattice parameters calculated from both X-ray diffraction and selected area electron diffraction patterns are in good agreement with the reported theoretical *** nano-laminated fracture of kink boundaries,delamination,and slipping were observed at the tip of the Vickers *** elastic modulus and Vickers hardness of Y_(3)Si_(2)C_(2) ceramics(with 5.5 wt%Y_(2)O_(3)) sintered at 1500℃were 156 and 6.4 GPa,*** corresponding values of thermal and electrical conductivity were 13.7 W·m^(-1)·K^(-1) and 6.3×10^(5)S·m^(-1),respectively.

关键词： Y3Si_(2)C_(2) rare earth silicide carbides spark plasma sintering(SPS) ternary layered structure ceramic properties

Switching,explosion,and chaos of multi-wavelength soliton states in ultrafast fiber lasers

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 82-90页

作者： Zhi-Zeng Si Yue-Yue Wang Chao-qing dai College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityLin’an 311300China

Because of the complexity and difficulty of realizing a multi-wavelength soliton state,reports on its internal dynamic characteristics are *** this study,the switching and periodic soliton explosion processes of the multi-wavelength soliton state in a negative dispersion passively mode-locked fiber laser are *** generation of the multi-wavelength soliton state undergoes the process of noise,oscillation,and stable mode-locking,and the splitting and annihilation of solitons with different group velocities directly impact the generation and disappearance of three *** and negative dispersion lead to different group velocities of *** presence and displacement of solitons with different group velocities cause soliton collisions,which lead to soliton explosions.A soliton experiences relative phase oscillation,chaos,and oscillation,as well as convergence and separation before and after an *** an increase in parameters related to pump power,single-soliton oscillation,multi-wavelength solitons,and chaos are found in experiments and simulations,proving the relevance and reliability between simulation and experimental *** work promotes the dynamical study of multi-soliton collisions in nonlinear science and the development of chaos theory in multi-comb lasers.

关键词： multi-wavelength fiber laser soliton explosion chaos state switching real-time dynamics

Flow field effect of delayed neutron precursors in liquid-fueled molten salt reactors

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Nuclear Science and Techniques 2022年第8期33卷 16-32页

作者： Xian-Di Zuo Mao-Song Cheng Yu-qing dai Kai-Cheng Yu Zhi-Min dai Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

In molten salt reactors(MSRs),the liquid fuel salt circulates through the primary loop and a part of the delayed neutron precursors(DNPs)decays outside the reactor *** model and analyze the flow field effect of DNPs in channel-type liquid-fueled MSRs,a three-dimensional space-time dynamics code,named ThorCORE3D,that couples neutronics,core thermalhydraulics,and a molten salt loop system was developed and validated with the Molten Salt Reactor Experiment(MSRE)*** effects of external loop recirculation time,fuel flow rate,and core flow field distribution on the delayed neutron fraction loss of MSRE at steadystate were modeled and simulated using the ThorCORE3D ***,the flow field effect of the DNPs on the system responses of the MSRE in the reactivity insertion transient under different initial conditions was analyzed systematically for the channel-type liquid-fueled *** results indicate that the flow field condition has a significant effect on the steady-state delayed neutron fractions and will further affect the transient power and temperature responses of the reactor *** analysis results for the effect of the DNP flow field can provide important references for the design optimization and safety analysis of liquid-fueled MSRs.

关键词： Molten salt reactor Delayed neutron precursor Nodal expansion method Coupled neutronics and thermal-hydraulics

A high strength pH responsive supramolecular copolymer hydrogel

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Science China(Technological Sciences) 2017年第1期60卷 78-83页

作者： WANG qing ZHANG YinYu dai XiYang SHI XiaoHuan LIU WenGuang School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin 300354 China

Constructing high strength pH sensitive supramolecular polymer hydrogel remains very challenging due to the unavoidable network swelling caused by ionization of acid or basic groups at a specified *** this work,we proposed a simple and very convenient approach to fabricate high strength pH responsive supramolecular polymer(SP) hydrogels by one-pot copolymerization of N-acryloyl glycinamide(NAGA) and 2-vinyl-4,6-diamino-1,3,5-triazine(VDT),two feature hydrogen bonding *** these PNAGA-PVDT SP hydrogels obtained,the hydrogen bonding of NAGA was shown to play a dominant role in reinforcing strength,while the hydrogen bonding of diaminotriazine served as a pH sensitive *** pH 3,the mechanical properties of PNAGA-PVDT hydrogels decreased to a different extent due to the breakup of hydrogen bonding;in contrast,the hydrogel resumed the original strength while pH was raised to 7.4 because of reconstruction of hydrogen *** the selected pH range,the PNAGA-PVDT hydrogels exhibited up to 1.25 MPa tensile strength,845% breaking strain,69 kPa Young's modulus and 21 MPa compressive *** novel high strength pH-responsive SP hydrogels may find applications in biomedical and industrial fields.

关键词： high strength pH responsive supramolecular polymer hydrogel

Symmetric and Anti-Symmetric Solitons of the Fractional Second- and Third-Order Nonlinear Schrodinger Equation

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Chinese Physics Letters 2021年第9期38卷 18-21页

作者： Qi-Hao Cao Chao-qing dai College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityLin’an 311300China

The fractional second-and third-order nonlinear Schrodinger equation is studied,symmetric and antisymmetric soliton solutions are derived,and the influence of the Levy index on different solitons is *** stability and stability interval of solitons are *** anti-interference ability of stable solitons to the small disturbance shows a good robustness.

关键词： solitons stability soliton

Effect of Extrusion Strain Path on Microstructure and Properties of AZ31 Magnesium Alloy Sheet

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Acta Metallurgica Sinica(English Letters) 2015年第10期28卷 1257-1263页

作者： qing-Shan Yang Bin Jiang Zu-Jian Yu qing-Wei dai Su-Qin Luo School of Metallurgy and Material Engineering Chongqing University of Science and Technology Chongqing Academy of Science and Technology

The mechanical properties of AZ31 magnesium alloy sheets processed by different extrusion strain paths were examined in correlation with concurrent microstructure and texture evolution. The conventional extrusion（CE） and asymmetric extrusion（ASE） paths were performed on Mg alloy sheets. The textures at near surface and mid-layer of ASE sheets were various throughout sheet thickness direction as a result of extra asymmetric shear strain. This can stimulate the orientation of（0002） basal planes to incline approximately 12° toward the shear direction. Moreover, the basal texture of ASE sheet was weakened compared with CE one. Enhancing the ambient formability of extruded Mg alloy sheet fabricated by ASE path was accomplished by the tilted weak basal texture.

关键词： Mg alloy Extrusion Microstructure Texture Mechanical property Formability

A special issue for the 20^(th) anniversary of National Center for Nanoscience and Technology

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Nano Research 2023年第12期16卷 12881-12882页

作者： qing dai Guangjun Nie Zhiyong Tang Yuliang Zhao CAS Key Laboratory of Nanophotonic Materials and Devices National Center for Nanoscience and TechnologyBeijing 100190China CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Centre for Nanoscience and TechnologyBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

National Center for Nanoscience and Technology(NCNST),China,established in December 2003,is co-founded by the Chinese Academy of Sciences(CAS)and the Ministry of Education as an institution dedicated to fundamental and applied researches in the field of nanoscience and technology,especially those with important potential *** is operated under the supervision of the Governing Board and aims to become a world-class research center,as well as public technological platform and young talents training center in the field,and to act as an important bridge for international academic exchange and *** NCNST currently has three CAS Key Laboratories:the CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety,the CAS Key Laboratory for Standardization and Measurement for Nanotechnology and the CAS Key Laboratory for Nanosystem and Hierarchical *** 2020,the CAS Key Laboratory of Nanophotonic Materials and Devices started ***,there are Division of Nanotechnology Development,Nanofabrication Laboratory,Intelligent Nanosensing Laboratory and Theoretical Laboratory.

关键词： field exchange collaboration

Dynamics and formation of vortices collapsed from ring dark solitons in a two-dimensional spin–orbit coupled Bose–Einstein condensate

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Frontiers of physics 2022年第4期17卷 185-193页

作者： Peng-Hong Lu Xiao-Fei Zhang Chao-qing dai College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityLin’an 311300China Department of Physics Shaanxi University of Science and TechnologyXi’an 710021China

We consider the dynamics and formation of vortices from ring dark solitons in a two-dimensional Bose–Einstein condensate with the Rashba spin–orbit coupling based on the time-dependent coupled Gross–Pitaevskii *** with previous results,the system exhibits complex dynamical behaviors in the presence of the spin–orbit *** the modulation of the spin–orbit coupling,not only the lifetime of ring dark solitons is greatly prolonged,but also their attenuation kinetics is significantly *** two shallow ring dark solitons with the equal strength of the spin–orbit coupling,the radius of ring dark solitons increases to a maximum value over time and then shrinks into a minimum *** to the effect of the snake instability,ring dark solitons split into a series of ring-like clusters of vortex pairs,which perform complex *** indicates that the system is strongly dependent on the presence of the spin–orbit ***,the effect of different initial modulation depths on the dynamics of ring dark solitons is investigated.

关键词： Bose–Einstein condensate Rashba spin–orbit coupling ring dark solitons vortex pairs