1. “Fast Terminal Sliding Control of Underactuated Robotic Systems Based on Disturbance Observer with Experimental Validation”
by Thaned Rojsiraphisal, Saleh Mobayen, Jihad H. Asad, Mai The Vu, Arthur Chang and Jirapong Puangmalai
Mathematics 2021, 9(16), 1935; https://doi.org/10.3390/math9161935
Full text available online:  https://www.mdpi.com/2227-7390/9/16/1935

2. “Optimization of Sliding Mode Control to Save Energy in a SCARA Robot”
by Luis Arturo Soriano, José de Jesús Rubio, Eduardo Orozco, Daniel Andres Cordova, Genaro Ochoa, Ricardo Balcazar, David Ricardo Cruz, Jesus Alberto Meda-Campaña, Alejandro Zacarias and Guadalupe Juliana Gutierrez
Mathematics 2021, 9(24), 3160; https://doi.org/10.3390/math9243160
Full text available online: https://www.mdpi.com/2227-7390/9/24/3160

3. “Trigonometric Solution for the Bending Analysis of Magneto-Electro-Elastic Strain Gradient Nonlocal Nanoplates in Hygro-Thermal Environment”
by Giovanni Tocci Monaco, Nicholas Fantuzzi, Francesco Fabbrocino and Raimondo Luciano
Mathematics 2021, 9(5), 567; https://doi.org/10.3390/math9050567
Full text available online: https://www.mdpi.com/2227-7390/9/5/567

4. “Application of Feature Extraction and Artificial Intelligence Techniques for Increasing the Accuracy of X-ray Radiation Based Two Phase Flow Meter”
by Abdulrahman Basahel, Mohammad Amir Sattari, Osman Taylan and Ehsan Nazemi
Mathematics 2021, 9(11), 1227; https://doi.org/10.3390/math9111227
Full text available online: https://www.mdpi.com/2227-7390/9/11/1227

5. “Enhancing Gain for UWB Antennas Using FSS: A Systematic Review”
by Ahmed Jamal Abdullah Al-Gburi, Imran Mohd Ibrahim, Zahriladha Zakaria, Muhannad Kaml Abdulhameed and Tale Saeidi
Mathematics 2021, 9(24), 3301; https://doi.org/10.3390/math9243301
Full text available online: https://www.mdpi.com/2227-7390/9/24/3301

6. “AB-Net: A Novel Deep Learning Assisted Framework for Renewable Energy Generation Forecasting”
by Noman Khan, Fath U Min Ullah, Ijaz Ul Haq, Samee Ullah Khan, Mi Young Lee and Sung Wook Baik
Mathematics 2021, 9(19), 2456; https://doi.org/10.3390/math9192456
Full text available online: https://www.mdpi.com/2227-7390/9/19/2456

7. “Numerical Computation of Dusty Hybrid Nanofluid Flow and Heat Transfer over a Deformable Sheet with Slip Effect”
by Nur Syazana Anuar, Norfifah Bachok and Ioan Pop
Mathematics 2021, 9(6), 643; https://doi.org/10.3390/math9060643
Full text available online: https://www.mdpi.com/2227-7390/9/6/643

8. “A Modified Rao-2 Algorithm for Optimal Power Flow Incorporating Renewable Energy Sources”
by Mohamed H. Hassan, Salah Kamel, Ali Selim, Tahir Khurshaid and José Luis Domínguez-García
Mathematics 2021, 9(13), 1532; https://doi.org/10.3390/math9131532
Full text available online: https://www.mdpi.com/2227-7390/9/13/1532

9. “The Comprehensive Identification of Roof Risk in a Fully Mechanized Working Face Using the Cloud Model”
by Yu Xiong, Dezhong Kong, Zhanbo Cheng, Guiyi Wu and Qi Zhang
Mathematics 2021, 9(17), 2072; https://doi.org/10.3390/math9172072
Full text available online: https://www.mdpi.com/2227-7390/9/17/2072

10. “Issues on Applying One- and Multi-Step Numerical Methods to Chaotic Oscillators for FPGA Implementation”
by Omar Guillén-Fernández, María Fernanda Moreno-López and Esteban Tlelo-Cuautle
Mathematics 2021, 9(2), 151; https://doi.org/10.3390/math9020151
Full text available online: https://www.mdpi.com/2227-7390/9/2/151