Urban air mobility (UAM) and ground transportation integration: A survey

Yiping YAN, Kai WANG, Xiaobo QU

PDF(1956 KB)
PDF(1956 KB)
Front. Eng ›› 2024, Vol. 11 ›› Issue (4) : 734-758. DOI: 10.1007/s42524-024-0298-0
Traffic Engineering System Management
RESEARCH ARTICLE

Urban air mobility (UAM) and ground transportation integration: A survey

Author information +
History +

Abstract

This study explores urban air mobility (UAM) as a strategy for mitigating escalating traffic congestion in major urban areas as a consequence of a static transportation supply versus dynamic demand growth. It offers an in-depth overview of UAM development, highlighting its present state and the challenges of integration with established urban transport systems. Key areas of focus include the technological advancements and obstacles in electric vertical take-off and landing (eVTOL) aircrafts, which are essential for UAM operation in urban environments. Furthermore, it explores the infrastructure requirements for UAM, including vertiport deployment and the creation of adept air traffic control (ATC) systems. These developments must be integrated into the urban landscape without exacerbating land-use challenges. This paper also examines the regulatory framework for UAM, including existing aviation regulations and the necessity for novel policies specifically designed for urban aerial transport. This study presents a comprehensive perspective for various stakeholders, from policymakers to urban planners, highlighting the need for a thorough understanding of UAM’s potential and effective assimilation into urban mobility frameworks.

Graphical abstract

Keywords

urban air mobility / integration / eVTOL / ground transportation / flying car

Cite this article

Download citation ▾
Yiping YAN, Kai WANG, Xiaobo QU. Urban air mobility (UAM) and ground transportation integration: A survey. Front. Eng, 2024, 11(4): 734‒758 https://doi.org/10.1007/s42524-024-0298-0

References

[1]
Adnan N, Md Nordin S, Bin Bahruddin M A, Ali M, (2018). How trust can drive forward the user acceptance to the technology? In-vehicle technology for autonomous vehicle. Transportation Research Part A, Policy and Practice, 118: 819–836
CrossRef Google scholar
[2]
Agatz N, Erera A, Savelsbergh M, Wang X, (2012). Optimization for dynamic ride-sharing: A review. European Journal of Operational Research, 223( 2): 295–303
CrossRef Google scholar
[3]
Airbus (2018). Blueprint for the Sky: The Roadmap for the Safe Integration of Autonomous Aircraft. Available at the website of googleapis.com
[4]
Al Haddad C, Chaniotakis E, Straubinger A, Plötner K, Antoniou C, (2020). Factors affecting the adoption and use of urban air mobility. Transportation Research Part A, Policy and Practice, 132: 696–712
CrossRef Google scholar
[5]
BaiduMaps (2023). 2022 Annual China Urban Traffic Report. Available at the website of Baidu
[6]
Bakker S, Konings R, (2018). The transition to zero-emission buses in public transport – The need for institutional innovation. Transportation Research Part D, Transport and Environment, 64: 204–215
CrossRef Google scholar
[7]
Ballantyne A M, Laurence P J, (1956). The lives and work of William Samuel Henson and John Stringfellow. Journal of the Royal Aeronautical Society, 60( 546): 363–401
CrossRef Google scholar
[8]
BaurSSchickramSHomulenkoAMartinezNDyskinA (2018). Urban air mobility: The rise of a new mode of transportation. ROLAND BERGER GMBH
[9]
Bauranov A, Rakas J, (2021). Designing airspace for urban air mobility: A review of concepts and approaches. Progress in Aerospace Sciences, 125: 100726
CrossRef Google scholar
[10]
Becker F, Axhausen K W, (2017). Literature review on surveys investigating the acceptance of automated vehicles. Transportation, 44( 6): 1293–1306
CrossRef Google scholar
[11]
Bennett R, Vijaygopal R, Kottasz R, (2019). Attitudes towards autonomous vehicles among people with physical disabilities. Transportation Research Part A, Policy and Practice, 127: 1–17
CrossRef Google scholar
[12]
BillsASripadSFredericksLGuttenbergMCharlesDFrankEViswanathanV (2023). A battery dataset for electric vertical takeoff and landing aircraft. Scientific Data, 10, 344
[13]
Bloom D E, Canning D, Fink G, (2008). Urbanization and the wealth of nations. Science, 319( 5864): 772–775
CrossRef Google scholar
[14]
BOEING (2023). Concept of Operations for Uncrewed Urban Air Mobility Version 2.0. Available at the website of boeing.com
[15]
BoozAllen Hamilton (2018). Urban Air Mobility (UAM) Market Study
[16]
Brelje B J, Martins J R R A, (2019). Electric, hybrid, and turboelectric fixed-wing aircraft: A review of concepts, models, and design approaches. Progress in Aerospace Sciences, 104: 1–19
CrossRef Google scholar
[17]
Camacho T, Foth M, Rakotonirainy A, Rittenbruch M, Bunker J, (2016). The role of passenger-centric innovation in the future of public transport. Public Transport, 8( 3): 453–475
CrossRef Google scholar
[18]
Carlsten C, Rider C F, (2017). Traffic-related air pollution and allergic disease: An update in the context of global urbanization. Current Opinion in Allergy and Clinical Immunology, 17( 2): 85–89
CrossRef Google scholar
[19]
Chana W F, (1996). Flying automobiles—Are they for real?. SAE Transactions, 105: 1676–1687
[20]
Cohen A P, Shaheen S A, Farrar E M, (2021). Urban air mobility: history, ecosystem, market potential, and challenges. IEEE Transactions on Intelligent Transportation Systems, 22( 9): 6074–6087
CrossRef Google scholar
[21]
SMG Consulting (2023). Advanced air mobility reality index
[22]
Deloitte (2020). UAM Vision Concept of Operations (ConOps) UAM Maturity Level (UML) 4 Version 1.0
[23]
FAA (2020). Urban Air Mobility Concept of Operations v1.0
[24]
Federal Aviation Administration and the United States Department of Transportation (2023). Updated Fact Sheet (2023) on State and Local Regulation of Unmanned Aircraft Systems (UAS)
[25]
Federal Aviation Administration (2018). Integration of Civil Unmanned Aircraft Systems (UAS) in the National Airspace System (NAS) Roadmap
[26]
Federal Aviation Administration (2019). Unmanned Aircraft System Traffic Management (UTM)
[27]
Fagnant D J, Kockelman K M, (2018). Dynamic ride-sharing and fleet sizing for a system of shared autonomous vehicles in Austin, Texas. Transportation, 45( 1): 143–158
CrossRef Google scholar
[28]
FaunceT APrestJSuDHearneS JIacopiF (2018). On-grid batteries for large-scale energy storage: Challenges and opportunities for policy and technology. MRS Energy Sustainability, 5(1)
[29]
Flight Transportation Laboratory of Massachusetts Institute of Technology (1970). Concept Studies for Future Intracity Air Transportation Systems
[30]
Fu M, Rothfeld R, Antoniou C, (2019). Exploring preferences for transportation modes in an urban air mobility environment: Munich case study. Transportation Research Record: Journal of the Transportation Research Board, 2673( 10): 427–442
CrossRef Google scholar
[31]
GarrowL AGermanBMokhtarianPGlodekJ (2019). A Survey to model demand for eVTOL urban air trips and competition with autonomous ground vehicles. In: AIAA Aviation 2019 Forum. Dallas, Texas: American Institute of Aeronautics and Astronautics
[32]
Garrow L A, German B J, Leonard C E, (2021). Urban air mobility: A comprehensive review and comparative analysis with autonomous and electric ground transportation for informing future research. Transportation Research Part C, Emerging Technologies, 132: 103377
CrossRef Google scholar
[33]
GermanBDaskilewiczMHamiltonT KWarrenM M (2018). Cargo delivery in by passenger eVTOL aircraft: A case study in the San Francisco Bay area. In: 2018 AIAA Aerospace Sciences Meeting. Kissimmee, Florida: American Institute of Aeronautics and Astronautics
[34]
GesleyJFeikert-AhaltC (2023). Regulation of advanced air mobility. The Law Library of Congress: Global Legal Research Directorate
[35]
GoodrichK HTheodoreC R (2021). Description of the NASA urban air mobility maturity level (UML) Scale. In: AIAA Scitech 2021 Forum. VIRTUAL EVENT: American Institute of Aeronautics and Astronautics
[36]
GoyalRReicheCFernandoCSerraoJKimmelSCohenAShaheenS (2018). Urban Air Mobility (UAM) Market Study
[37]
Han F, Xie R, Lai M, (2018). Traffic density, congestion externalities, and urbanization in China. Spatial Economic Analysis, 13( 4): 400–421
CrossRef Google scholar
[38]
HaynesBAlerigiA J (2016). Uber offers helicopters to escape Sao Paulo gridlock
[39]
HelicopterMe (2020). Helicopter me, luxury helicopter travel. Available at the website of helicopterme
[40]
Helitaxii (2020). AIRPORT SHUTTLE. Available at the website of helitaxii
[41]
Hiratagakuen (2020). Hiratagakuen charter and air taxi services. Available at the website of .aerohirata.co.jp
[42]
HoldenJGoelN (2016). Fast-Forwarding to a Future of On-Demand Urban Air Transportation
[43]
Holmes B J, Durham M H, Tarry S E, (2004). Small aircraft transportation system concept and technologies. Journal of Aircraft, 41( 1): 26–35
CrossRef Google scholar
[44]
Hu J W, Javaid A, Creutzig F, (2021). Leverage points for accelerating adoption of shared electric cars: Perceived benefits and environmental impact of NEVs. Energy Policy, 155: 112349
CrossRef Google scholar
[45]
Hwang J H, Hong S, (2023). A study on the factors influencing the adoption of urban air mobility and the future demand: Using the stated preference survey for three UAM operational scenarios in South Korea. Journal of Air Transport Management, 112: 102467
CrossRef Google scholar
[46]
Ibrahim M F, (2003). Improvements and integration of a public transport system: The case of Singapore. Cities, 20( 3): 205–216
CrossRef Google scholar
[47]
INRIX (2022). Global traffic scorecard
[48]
JustinC YPayanA PBricenoS IMavrisD N (2017). Operational and Economic Feasibility of Electric Thin Haul Transportation. In: 17th AIAA Aviation Technology, Integration, and Operations Conference. Denver, Colorado: American Institute of Aeronautics and Astronautics
[49]
Kai W, Jacquillat A, Vaze V, (2022). Vertiport planning for urban aerial mobility: An adaptive discretization approach. manufacturing & service operations management, 24( 6): 3215–3235
CrossRef Google scholar
[50]
Kasliwal A, Furbush N J, Gawron J H, McBride J R, Wallington T J, De Kleine R D, Kim H C, Keoleian G A, (2019). Role of flying cars in sustainable mobility. Nature Communications, 10( 1): 1555
CrossRef Google scholar
[51]
KimH DPerryA TAnsellP J (2018). A review of distributed electric propulsion concepts for air vehicle technology. In: Cincinnati, OH, USA: IEEE, 1–21
[52]
KimSHarrisC MJustinC YMavrisD N (2022). Optimal Trajectory and En-Route Contingency Planning for Urban Air Mobility Considering Battery Energy Levels. In: AIAA Aviation 2022 Forum. Chicago, IL & Virtual: American Institute of Aeronautics and Astronautics
[53]
KohlmanL WPattersonM D (2018). System-level urban air mobility transportation modeling and determination of energy-related constraints. In: 2018 Aviation Technology, Integration, and Operations Conference. Atlanta, Georgia: American Institute of Aeronautics and Astronautics
[54]
KreimeierMStumpfE (2017). Market volume estimation of thin-haul On-Demand Air Mobility services in Germany. In: 17th AIAA Aviation Technology, Integration, and Operations Conference. Denver, Colorado: American Institute of Aeronautics and Astronautics
[55]
KrylovaM (2022). Urban planning requirements for the new air mobility (UAM) infrastructure integration. Frankfurt University of Applied Sciences
[56]
LallyJ (2013). Aviation’s Unsung Hero – Glenn Hammond Curtiss
[57]
LascaraBSpencerTDeGarmoMLacherAMaroneyDGuterresM (2018). Urban air mobility landscape report: Initial examination of a new air transportation system
[58]
LidyniaCPhilipsenRZiefleM (2017). Droning on about drones—Acceptance of and perceived barriers to drones in civil usage contexts. In: Savage-Knepshield P, Chen J eds. Advances in Human Factors in Robots and Unmanned Systems. Advances in Intelligent Systems and Computing. Cham: Springer International Publishing, 317–329
[59]
Lin H, Yan Y, Cheng Q, (2023). Future role of artificial intelligence in advancing transportation Electrification. Journal of Intelligent and Connected Vehicles, 6( 3): 183–186
CrossRef Google scholar
[60]
Liu Y, Gong X, Tang Y, Hu M, Ma J, Qin Y, Wu F, Pu H, Luo J, (2023a). An iterative optimization-based predictive control method for eco-driving of unmanned vehicles. Journal of Automotive Safety and Energy, 14( 1): 80–88
CrossRef Google scholar
[61]
Liu Y, Wu F, Liu Z, Wang K, Wang F, Qu X, (2023b). Can language models be used for real-world urban-delivery route optimization?. The Innovation, 4( 6): 100520
[62]
Long Q, Ma J, Jiang F, Webster C J, (2023). Demand analysis in urban air mobility: A literature review. Journal of Air Transport Management, 112: 102436
CrossRef Google scholar
[63]
Luo Y, Qian Y, Zeng Z, Zhang Y, (2021). Simulation and analysis of operating characteristics of power battery for flying car utilization. eTransportation, 8: 100111
[64]
Lusikka T, Kinnunen T K, Kostiainen J, (2020). Public transport innovation platform boosting Intelligent Transport System value chains. Utilities Policy, 62: 100998
CrossRef Google scholar
[65]
MagetCGutmannSBogenbergerK (2020). Model-based evaluations combining autonomous cars and a large-scale passenger drone service: The Bavarian case study. In: 2020 IEEE 23rd International Conference on Intelligent Transportation Systems (ITSC). Rhodes, Greece: IEEE, 1–6
[66]
MayorTAndersonJ (2019). Getting mobility off the ground. KPMG Insight
[67]
McKinsey (2022). Perspectives on advanced air mobility: Navigating the emerging passenger urban and regional air-mobility industry
[68]
Microflite (2020). Melbourne CBD tranfers. Available at the website of microflite
[69]
Ministry of Land, Infrastructure, Transport and Tourism of Japan (2023). Concept of Operations for Advanced Air Mobility (ConOps for AAM)
[70]
Mitropoulos L, Kortsari A, Ayfantopoulou G, (2021). A systematic literature review of ride-sharing platforms, user factors and barriers. European Transport Research Review, 13( 1): 61
CrossRef Google scholar
[71]
MollerP (1998). Airborne personalized travel using “powered lift aircraft.” In: AIAA and SAE, 1998 World Aviation Conference. Anaheim,CA.U.S.A.: American Institute of Aeronautics and Astronautics
[72]
MooreM (2003). Personal Air Vehicles: A rural/regional and intra-urban on-demand transportation system. In: AIAA International Air and Space Symposium and Exposition: The Next 100 Years. Dayton, Ohio: American Institute of Aeronautics and Astronautics
[73]
NASA (2018). Urban Air Mobility (UAM) Market Study
[74]
National Aeronautics and Space Administration (2021). UAM Airspace Research Roadmap
[75]
Nees M A, (2016). Acceptance of self-driving cars. Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 60( 1): 1449–1453
[76]
NnejiV CStimpsonACummingsMGoodrichK H (2017). Exploring concepts of operations for on-demand passenger air transportation. 17th AIAA Aviation Technology, Integration, and Operations Conference, American Institute of Aeronautics and Astronautics, Denver, Colorado.
[77]
Ongkittikul S, Geerlings H, (2006). Opportunities for innovation in public transport: Effects of regulatory reforms on innovative capabilities. Transport Policy, 13( 4): 283–293
CrossRef Google scholar
[78]
OsterwalderAPigneurY (2010). Business model generation: A handbook for visionaries, game changers, and challengers. New Jersey: Wiley
[79]
PanGAlouiniM S (2020). Flying car transportation system: advances, techniques, and challenges. TechRxiv. April 26, 2020
[80]
PolaczykNTrombinoEWeiPMiticiM (2019). A review of current technology and research in urban on-demand air mobility applications. In: Vertical Flight Society, 333–343
[81]
Porsche Consulting (2018). The Future of Vertical Mobility
[82]
PukhovaALlorcaCMorenoAStavesCZhangQMoeckelR (2021). Flying taxis revived: Can Urban air mobility reduce road congestion? Journal of Urban Mobility, 1
[83]
QuXLinHLiuY (2023). Envisioning the future of transportation: Inspiration of ChatGPT and large models. Communications in Transportation Research, 3
[84]
QuXZengZWangKWangS (2022a). Replacing urban trucks via ground–air cooperation. Communications in Transportation Research, 2
[85]
QuXZhongLZengZTuHLiX (2022b). Automation and connectivity of electric vehicles: Energy boon or bane? Cell Reports. Physical Science, 3(8)
[86]
Rajashekara K, Wang Q, Matsuse K, (2016). Flying cars: Challenges and propulsion strategies. IEEE Electrification Magazine, 4( 1): 46–57
CrossRef Google scholar
[87]
Rijnders E, Janssen N A, Van Vliet P H, Brunekreef B, (2001). Personal and outdoor nitrogen dioxide concentrations in relation to degree of urbanization and traffic density. Environmental Health Perspectives, 109: 411–417
[88]
Rimjha M, Hotle S, Trani A, Hinze N, (2021). Commuter demand estimation and feasibility assessment for Urban Air Mobility in Northern California. Transportation Research Part A, Policy and Practice, 148: 506–524
CrossRef Google scholar
[89]
RitchieHRoserM (2018). Urbanization. OurWorldInData.org
[90]
RobinsonJ NSokollekM D RJustinC YMavrisD N (2018). Development of a Methodology for Parametric Analysis of STOL Airpark Geo-Density. In: 2018 Aviation Technology, Integration, and Operations Conference. Atlanta, Georgia: American Institute of Aeronautics and Astronautics
[91]
S.516-117thCongress (2021–2022). Advanced Air Mobility Coordination and Leadership Act
[92]
SESARJoint Undertaking (2020). Digital European sky blueprint. LU: Publications Office
[93]
SESAR Joint Undertaking (2023). U-space ConOps and architecture (edition 4)
[94]
ShahK (2019). On-demand helicopter services are ready to take off
[95]
Smith G, Hensher D A, (2020). Towards a framework for Mobility-as-a-Service policies. Transport Policy, 89: 54–65
CrossRef Google scholar
[96]
SomersL AJustinC YMavrisD N (2019). Wind and obstacles impact on airpark placement for STOL-based sub-urban air mobility. In: AIAA Aviation 2019 Forum. Dallas, Texas: American Institute of Aeronautics and Astronautics
[97]
Sripad S, Viswanathan V, (2021). The promise of energy-efficient battery-powered urban aircraft. Proceedings of the National Academy of Sciences of the United States of America, 118( 45): 10–12
CrossRef Google scholar
[98]
StithP (2020). Powered for Take Off: NIA-NASA Urban Air Mobility Electric Infrastructure Study
[99]
Stoker P, Garfinkel-Castro A, Khayesi M, Odero W, Mwangi M N, Peden M, Ewing R, (2015). Pedestrian safety and the built environment. Journal of Planning Literature, 30( 4): 377–392
CrossRef Google scholar
[100]
StraubingerARothfeldRShamiyehMBüchterK DKaiserJPlötnerK O (2020). An overview of current research and developments in urban air mobility – Setting the scene for UAM introduction. Journal of Air Transport Management, 87
[101]
StraubingerAVerhoefE TDe GrootH L F (2021). Will urban air mobility fly? The efficiency and distributional impacts of UAM in different urban spatial structures. Transportation Research Part C, Emerging Technologies, 127
[102]
Sumalee A, Ho H W, (2018). Smarter and more connected: Future intelligent transportation system. IATSS Research, 42( 2): 67–71
CrossRef Google scholar
[103]
Sun X, Wandelt S, Husemann M, Stumpf E, (2021). Operational Considerations regarding On-Demand Air Mobility: A Literature Review and Research Challenges. Journal of Advanced Transportation, 2021: 1–20
CrossRef Google scholar
[104]
Tafreshian A, Masoud N, Yin Y, (2020). Frontiers in service science: Ride matching for peer-to-peer ride sharing: A review and future directions. Service Science, 12( 2–3): 44–60
CrossRef Google scholar
[105]
Tang H, Zhang Y, Mohmoodian V, Charkhgard H, (2021). Automated flight planning of high-density urban air mobility. Transportation Research Part C, Emerging Technologies, 131: 103324
CrossRef Google scholar
[106]
TraniABaikHHinzeNAshiaborSVikenJDollyhighS (2006). Nationwide impacts of very light jet traffic in the future next generation air transportation system (NGATS). In: 6th AIAA Aviation Technology, Integration and Operations Conference (ATIO). Wichita, Kansas: American Institute of Aeronautics and Astronautics
[107]
UAM Initiative Cities Community (2021). Manifesto on the Multilevel Governance of the Urban Sky
[108]
Uber (2019). Introducing Uber Copter. Available at the website of uber
[109]
Ullah H, Gopalakrishnan Nair N, Moore A, Nugent C, Muschamp P, Cuevas M, (2019). 5G Communication: An overview of vehicle-to-everything, drones, and healthcare use-cases. IEEE Access: Practical Innovations, Open Solutions, 7: 37251–37268
CrossRef Google scholar
[110]
VascikP D (2017). Systems-Level Analysis of on demand mobility for aviation. Master Thesis. Massachusetts Institute of Technology
[111]
VascikP D (2020). Systems analysis of urban air mobility operational scaling. Doctoral Thesis Thesis. Massachusetts Institute of Technology
[112]
VascikP DHansmanR J (2017). Constraint identification in on-demand mobility for aviation through an exploratory case study of Los Angeles. In: 17th AIAA Aviation Technology, Integration, and Operations Conference. Denver, Colorado: American Institute of Aeronautics and Astronautics
[113]
VenkateshNPayanA PJustinC YKeeEMavrisD (2020). Optimal siting of sub-urban air mobility (sUAM) ground architectures using network flow formulation. In: AIAA Aviation 2020 Forum. Virtual Event: American Institute of Aeronautics and Astronautics
[114]
Viken S A, Brooks F M, Johnson S C, (2006). Overview of the small aircraft transportation system project four enabling operating capabilities. Journal of Aircraft, 43: 1602–1612
CrossRef Google scholar
[115]
WangKLiAQuX (2023). Urban aerial mobility: Network structure, transportation benefits, and Sino-US comparison. The Innovation, 4
[116]
WangKQuX (2023). Urban aerial mobility: Reshaping the future of urban transportation. The Innovation, 4
[117]
WarrenMGarboAKotwicz HerniczekM THamiltonTGermanB (2019). Effects of range requirements and battery technology on electric VTOL sizing and operational performance. In: AIAA Scitech 2019 Forum. San Diego, California: American Institute of Aeronautics and Astronautics
[118]
WeiLJustinC YMavrisD N (2020). Optimal placement of airparks for STOL urban and suburban air mobility. In: AIAA Scitech 2020 Forum. Orlando, FL: American Institute of Aeronautics and Astronautics
[119]
Wu J, Qu X, (2022). Intersection control with connected and automated vehicles: A review. Journal of Intelligent And Connected Vehicles, 5( 3): 260–269
CrossRef Google scholar
[120]
Wu Z, Zhang Y, (2021). Integrated network design and demand forecast for on-demand urban air mobility. Engineering, 7( 4): 473–487
CrossRef Google scholar
[121]
Yang X G, Liu T, Ge S, Rountree E, Wang C Y, (2021). Challenges and key requirements of batteries for electric vertical takeoff and landing aircraft. Joule, 5( 7): 1644–1659
CrossRef Google scholar
[122]
YedavalliPMooberryJ (2019). An Assessment of Public Perception of Urban Air Mobility (UAM)
[123]
ZengZQuX (2023). What’s next for battery-electric bus charging systems. Communications in Transportation Research, 3
[124]
Zheng C, Yan Y, Liu Y, (2023). Prospects of eVTOL and modular flying cars in China urban settings. Journal of Intelligent and Connected Vehicles, 6( 4): 187–189
CrossRef Google scholar

Competing Interests

The authors declare that they have no competing interests.

Open Access

This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.
The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

RIGHTS & PERMISSIONS

2024 The Author(s). This article is published with open access at link.springer.com and journal.hep.com.cn
AI Summary AI Mindmap
PDF(1956 KB)

Accesses

Citations

Detail

Sections
Recommended

/