1. “A Survey on Robotic Technologies for Forest Firefighting: Applying Drone Swarms to Improve Firefighters’ Efficiency and Safety”
by Roldán-Gómez, J.; González-Gironda, E. and Barrientos, A.
Appl. Sci. 2021, 11(1), 363; https://doi.org/10.3390/app11010363
Available online: https://www.mdpi.com/2076-3417/11/1/363

2. “Methodology for Complex Efficiency Evaluation of Machinery Safety Measures in a Production Organization”
by Pačaiová, H.; Andrejiová, M.; Balažiková, M.; Tomašková, M.; Gazda, T.; Chomová, K.; Hijj, J. and Salaj, L.
Appl. Sci. 2021, 11(1), 453; https://doi.org/10.3390/app11010453
Available online: https://www.mdpi.com/2076-3417/11/1/453

3. “Effect of Hydrogen Addition on the Energetic and Ecologic Parameters of an SI Engine Fueled by Biogas”
by Pukalskas, S.; Kriaučiūnas, D.; Rimkus, A.; Przybyła, G.; Droździel, P. and Barta, D.
Appl. Sci. 2021, 11(2), 742; https://doi.org/10.3390/app11020742
Available online: https://www.mdpi.com/2076-3417/11/2/742

4. “Uncertainty Handling in Structural Damage Detection via Non-Probabilistic Meta-Models and Interval Mathematics, a Data-Analytics Approach”
by Ghiasi, R.; Noori, M.; Altabey, W.; Silik, A.; Wang, T. and Wu, Z.
Appl. Sci. 2021, 11(2), 770; https://doi.org/10.3390/app11020770
Available online: https://www.mdpi.com/2076-3417/11/2/770

5. “Enhanced K-Nearest Neighbor for Intelligent Fault Diagnosis of Rotating Machinery”
by Lu, J.; Qian, W.; Li, S. and Cui, R.
Appl. Sci. 2021, 11(3), 919; https://doi.org/10.3390/app11030919
Available online: https://www.mdpi.com/2076-3417/11/3/919

6. “Rail Diagnostics Based on Ultrasonic Guided Waves: An Overview”
by Bombarda, D.; Vitetta, G. and Ferrante, G.
Appl. Sci. 2021, 11(3), 1071; https://doi.org/10.3390/app11031071
Available online: https://www.mdpi.com/2076-3417/11/3/1071

7. “Life Cycle Assessment of an NMC Battery for Application to Electric Light-Duty Commercial Vehicles and Comparison with a Sodium-Nickel-Chloride Battery”
by Accardo, A.; Dotelli, G.; Musa, M. and Spessa, E.

Appl. Sci. 2021, 11(3), 1160; https://doi.org/10.3390/app11031160
Available online: https://www.mdpi.com/2076-3417/11/3/1160

8. “Advances in Metal Additive Manufacturing: A Review of Common Processes, Industrial Applications, and Current Challenges”
by Vafadar, A.; Guzzomi, F.; Rassau, A. and Hayward, K.
Appl. Sci. 2021, 11(3), 1213; https://doi.org/10.3390/app11031213
Available online: https://www.mdpi.com/2076-3417/11/3/1213

9. “Deep Learning Method for Fault Detection of Wind Turbine Converter”
by Xiao, C.; Liu, Z.; Zhang, T. and Zhang, X.
Appl. Sci. 2021, 11(3), 1280; https://doi.org/10.3390/app11031280
Available online: https://www.mdpi.com/2076-3417/11/3/1280

10. “Topology Optimisation in Structural Steel Design for Additive Manufacturing”
by Ribeiro, T.; Bernardo, L. and Andrade, J.
Appl. Sci. 2021, 11(5), 2112; https://doi.org/10.3390/app11052112
Available online: https://www.mdpi.com/2076-3417/11/5/2112

11. “Integrated Design of a Morphing Winglet for Active Load Control and Alleviation of Turboprop Regional Aircraft”
by Dimino, I.; Andreutti, G.; Moens, F.; Fonte, F.; Pecora, R. and Concilio, A.
Appl. Sci. 2021, 11(5), 2439; https://doi.org/10.3390/app11052439
Available online: https://www.mdpi.com/2076-3417/11/5/2439

12. “Review of Liquid Argon Detector Technologies in the Neutrino Sector”
by Majumdar, K. and Mavrokoridis, K.
Appl. Sci. 2021, 11(6), 2455; https://doi.org/10.3390/app11062455
Available online: https://www.mdpi.com/2076-3417/11/6/2455

13. “A Comparative Study of Energy Consumption and Recovery of Autonomous Fuel-Cell Hydrogen–Electric Vehicles Using Different Powertrains Based on Regenerative Braking and Electronic Stability Control System”
by Yildiz, A. and Özel, M.
Appl. Sci. 2021, 11(6), 2515; https://doi.org/10.3390/app11062515
Available online: https://www.mdpi.com/2076-3417/11/6/2515

14. “Trends and Challenges in Intelligent Condition Monitoring of Electrical Machines Using Machine Learning”
by Kudelina, K.; Vaimann, T.; Asad, B.; Rassõlkin, A.; Kallaste, A. and Demidova, G.
Appl. Sci. 2021, 11(6), 2761; https://doi.org/10.3390/app11062761
Available online: https://www.mdpi.com/2076-3417/11/6/2761

15. “Multi-Resolution SPH Simulation of a Laser Powder Bed Fusion Additive Manufacturing Process”
by Afrasiabi, M.; Lüthi, C.; Bambach, M. and Wegener, K.
Appl. Sci. 2021, 11(7), 2962; https://doi.org/10.3390/app11072962
Available online: https://www.mdpi.com/2076-3417/11/7/2962

16. “Environmental Consequences of Closing the Textile Loop—Life Cycle Assessment of a Circular Polyester Jacket”
by Braun, G.; Som, C.; Schmutz, M. and Hischier, R.
Appl. Sci. 2021, 11(7), 2964; https://doi.org/10.3390/app11072964
Available online: https://www.mdpi.com/2076-3417/11/7/2964

17. “Exploring the Traveler’s Intentions to Use Public Transport during the COVID-19 Pandemic While Complying with Precautionary Measures”
by Abdullah, M.; Ali, N.; Dias, C.; Campisi, T. and Javid, M.
Appl. Sci. 2021, 11(8), 3630; https://doi.org/10.3390/app11083630
Available online: https://www.mdpi.com/2076-3417/11/8/3630

18. “A Review of X-ray Microcalorimeters Based on Superconducting Transition Edge Sensors for Astrophysics and Particle Physics”
by Gottardi, L. and Nagayashi, K.
Appl. Sci. 2021, 11(9), 3793; https://doi.org/10.3390/app11093793
Available online: https://www.mdpi.com/2076-3417/11/9/3793

19. “Industry 4.0 Technologies for Manufacturing Sustainability: A Systematic Review and Future Research Directions”
by Jamwal, A.; Agrawal, R.; Sharma, M. and Giallanza, A.
Appl. Sci. 2021, 11(12), 5725; https://doi.org/10.3390/app11125725
Available online: https://www.mdpi.com/2076-3417/11/12/5725

20. “Applications of Magnesium and Its Alloys: A Review”
by Tan, J. and Ramakrishna, S.
Appl. Sci. 2021, 11(15), 6861; https://doi.org/10.3390/app11156861
Available online: https://www.mdpi.com/2076-3417/11/15/6861