Most-cited Engineering papers of 2021, with free PDFs

The 25 most-cited Engineering research papers published in 2021, ranked by citations in OpenAlex, with their original abstracts and free PDFs where available.

1. NeRF
   Ben Mildenhall, Pratul P. Srinivasan et al. · 2021 · 6,718 citations
2. ORB-SLAM3: An Accurate Open-Source Library for Visual, Visual–Inertial, and Multimap SLAM
   Carlos Campos, Richard Elvira et al. · 2021 · 4,268 citations · Free PDF
3. The 30 m annual land cover dataset and its dynamics in China from 1990 to 2019
   Jie Yang, Xin Huang · 2021 · 3,839 citations · Free PDF
4. Intelligent Reflecting Surface-Aided Wireless Communications: A Tutorial
   Qingqing Wu, Shuowen Zhang et al. · 2021 · 3,011 citations · Free PDF
5. Industry 4.0 and Industry 5.0—Inception, conception and perception
   Xun William Xu, Yuqian Lu et al. · 2021 · 2,560 citations
6. Metal additive manufacturing in aerospace: A review
   Byron Blakey-Milner, Paul Gradl et al. · 2021 · 2,272 citations
7. A Review on Biosensors and Recent Development of Nanostructured Materials-Enabled Biosensors
   Varnakavi Naresh, Nohyun Lee · 2021 · 2,065 citations · Free PDF
8. PCT: Point cloud transformer
   Meng-Hao Guo, Jun-Xiong Cai et al. · 2021 · 1,918 citations · Free PDF
9. Future global urban water scarcity and potential solutions
   Chunyang He, Zhifeng Liu et al. · 2021 · 1,879 citations · Free PDF
10. Reconfigurable Intelligent Surfaces: Principles and Opportunities
    Yuanwei Liu, Xiao Liu et al. · 2021 · 1,863 citations · Free PDF
11. Material-structure-performance integrated laser-metal additive manufacturing
    Dongdong Gu, Xinyu Shi et al. · 2021 · 1,728 citations
12. The Road Towards 6G: A Comprehensive Survey
    Wei Jiang, Bin Han et al. · 2021 · 1,715 citations · Free PDF
13. Deep Learning Enabled Semantic Communication Systems
    Huiqiang Xie, Zhijin Qin et al. · 2021 · 1,583 citations · Free PDF
14. New approaches and procedures for cancer treatment: Current perspectives
    Dejene Tolossa Debela, Seke G. Y. Muzazu et al. · 2021 · 1,577 citations
15. 6G Wireless Systems: Vision, Requirements, Challenges, Insights, and Opportunities
    Harsh Tataria, Mansoor Shafi et al. · 2021 · 1,556 citations · Free PDF
16. State of the Art and Prospects for Halide Perovskite Nanocrystals
    Amrita Dey, Junzhi Ye et al. · 2021 · 1,484 citations
17. Single‐Junction Organic Photovoltaic Cell with 19% Efficiency
    Yong Yan Cui, Ye Xu et al. · 2021 · 1,479 citations
18. 6G Internet of Things: A Comprehensive Survey
    Dinh C. Nguyen, Ming Ding et al. · 2021 · 1,454 citations · Free PDF
19. Algorithm Unrolling: Interpretable, Efficient Deep Learning for Signal and Image Processing
    Vishal Monga, Yuelong Li et al. · 2021 · 1,431 citations · Free PDF
20. A Brief History of OLEDs—Emitter Development and Industry Milestones
    Gloria Hong, Xuemin Gan et al. · 2021 · 1,416 citations · Free PDF
21. A Review on Electric Vehicles: Technologies and Challenges
    Julio A. Sanguesa, Vicente Torres‐Sanz et al. · 2021 · 1,349 citations · Free PDF
22. Electrochemical Impedance Spectroscopy (EIS): Principles, Construction, and Biosensing Applications
    Hend Samy Magar, Rabeay Y. A. Hassan et al. · 2021 · 1,346 citations · Free PDF
23. Technologies and perspectives for achieving carbon neutrality
    Fang Wang, Jean Damascene Harindintwali et al. · 2021 · 1,332 citations
24. Augmented reality and virtual reality displays: emerging technologies and future perspectives
    Jianghao Xiong, En‐Lin Hsiang et al. · 2021 · 1,292 citations · Free PDF
25. Engineering Design Methods: Strategies for Product Design
    Nigel Cross · 2021 · 1,244 citations

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