**Preface to "Industrial Applications: New Solutions for the New Era"**

The authors from the conference IEEE-INDUSCON 2021, held in Sao Paulo, Brazil, were ˜ invited to submit an expanded version of their papers to a Special Issue of *Machines*: "Industrial Applications: New Solutions for the New Era", https://www.mdpi.com/journal/machines/special issues/industrial applications.

The special theme "Innovation in the time of COVID-19" was chosen for IEEE-INDUSCON 2021. The COVID-19 pandemic caused significant challenges that required quick responses from governments and industries. Recent changes have set the scene for an increased awareness of the importance of engineering as a problem solver. Meanwhile, these new challenges are opening up new opportunities for academia and industry innovators to create new solutions to the problems of this new era.

This Book presents twelve selected papers that are related to industrial applications in several major topics of the conference, including: artificial intelligence [1]; a ventricular assist device supervisory control system [2]; an ultrasonic technique to estimate water concentration in water-in-crude oil emulsions [3]; a method to remove noise from a laser scan of planar data [4]; control strategies for unmanned aerial vehicles [5]; infrared thermography fever detection for COVID-19 [6]; microgrid model-based systems engineering [7]; a blend of convolutional neural network pipelines that classifies products from an electrical company's warehouse [8]; the study and implementation of speed control applied to a squirrel cage type of three-phase induction machine [9]; the effective prediction of energy consumption with a smart home digital twin integrated with MLOps [10]; the advantages and disadvantages of relational (SQL) and non-relational (NoSQL) data models for Industry 4.0 [11]; a device and procedure involving static and dynamic tests to assess exoskeletons [12]; machine learning [1,10], and others.

The editors are pleased with the results of this Special Issue and appreciate the authors' valuable contributions and would like to thank the reviewers for their efforts and time spent on improving the submissions, and the publisher for their excellent work and cooperation.

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**Marcos de Sales Guerra Tsuzuki, Marcosiris Amorim de Oliveira Pessoa, Alexandre Ac´acio de Andrade** *Editors*
