Jia, X., & Bajaj, N. (2025). On Architectures for Combining Reinforcement Learning and Model Predictive Control with Runtime Improvements ⁎ ⁎ This work was supported by the University of Pittsburgh Swan-son School of Engineering, via the SURI Undergraduate Research Program. IFAC-PapersOnLine, 59(30), 401-406.Elsevier. doi: 10.1016/j.ifacol.2025.12.270.
Rahimpour, S., Bajaj, N., & Quinn, D.D. (2025). An Efficient Analysis of Amplitude and Phase Dynamics in Networked MEMS-Colpitts Oscillators. JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS, 20(1).ASME International. doi: 10.1115/1.4066801.
Hinds, T.A., & Bajaj, N. (2024). Rapid Resonator Characterization Using Phase Measurements and Extremum-Seeking Control. IFAC-PapersOnLine, 58(28), 252-257.Elsevier. doi: 10.1016/j.ifacol.2025.01.003.
Zhao, J., Dong, W., Hinds, T., Li, Y., Splain, Z., Zhong, S., Wang, Q., Bajaj, N., To, A., Ahmed, M., Petrie, C.M., & Chen, K.P. (2024). Embedded Fiber Bragg Grating (FBG) Sensors Fabricated by Ultrasonic Additive Manufacturing for High-Frequency Dynamic Strain Measurements. IEEE SENSORS JOURNAL, 24(3), 2853-2862.Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/JSEN.2023.3343604.
Borra, C., Bajaj, N., Rhoads, J.F., & Quinn, D.D. (2023). Multiple equilibrium states in large arrays of globally coupled resonators. NONLINEAR DYNAMICS, 111(20), 18585-18603.Springer Nature. doi: 10.1007/s11071-023-08870-4.
Shah, S.Y., Bajaj, N., Pyles, C., Weinstein, D., Rhoads, J.F., & Quinn, D.D. (2023). The dynamics of MEMS-Colpitts oscillators. NONLINEAR DYNAMICS, 111(19), 17639-17651.Springer Nature. doi: 10.1007/s11071-023-08774-3.
Borra, C., Bajaj, N., Rhoads, J.F., & Quinn, D.D. (2022). Multiple Equilibrium States in Large Arrays of Globally Coupled Resonators. In Research Square. doi: 10.21203/rs.3.rs-2301801/v1.
Siefker, Z.A., Zhao, X., Bajaj, N., Boyina, A., Braun, J.E., Chiu, G.T.C., Boudouris, B.W., & Rhoads, J.F. (2022). A Carbon Nanotube-Functional Polymer Composite Film for Low-Power Indoor CO₂ Monitoring. IEEE Sensors Journal, 22(12), 11233-11240.Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/jsen.2021.3131428.
Bajaj, N., Giampietro, N.C., Mao, K., Rushton, M.E., Spomer, N.A., & Rhoads, J.F. (2021). Searching for bed bugs: The design, development, and evaluation of an oscillator-based trans-2-hexenal sensor array. Sensors and Actuators B Chemical, 333, 129161.Elsevier. doi: 10.1016/j.snb.2020.129161.
Murray, A.K., Meseke, J.R., Bajaj, N., & Rhoads, J.F. (2021). Addressing the Practical Limitations of Volatile Organic Compound Sensors Through an Oscillator-Based Sensing Array. IEEE SENSORS JOURNAL, 21(2), 2169-2175.Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/JSEN.2020.3020849.
Siefker, Z.A., Hodul, J.N., Zhao, X., Bajaj, N., Brayton, K.M., Flores-Hansen, C., Zhao, W., Chiu, G.T.C., Braun, J.E., Rhoads, J.F., & Boudouris, B.W. (2021). Manipulating polymer composition to create low-cost, high-fidelity sensors for indoor CO2 monitoring. Sci Rep, 11(1), 13237.Springer Nature. doi: 10.1038/s41598-021-92181-4.
Bajaj, N., Laster, J.S., Boudouris, B.W., Chiu, G.T.C., & Rhoads, J.F. (2020). A Vapor Phase Trinitrotoluene Threshold Detector Enabled by Nonlinear Feedback. IEEE Sensors Letters, 4(11), 1-4.Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/lsens.2020.3032394.
Murrell, N., Bradley, R., Bajaj, N., Whitney, J., & Chiu, G.T.C. (2020). New Calibration Method for Implementing Machine Learning in Low-Cost Sensor Applications. IEEE SENSORS LETTERS, 4(2).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/LSENS.2020.2971714.
Habermehl, S.T., Bajaj, N., Shah, S.Y., Quinn, D.D., Weinstein, D., & Rhoads, J.F. (2019). Synchronization in a network of coupled MEMS-Colpitts oscillators. Nonlinear Dynamics, 98(4), 3037-3050.Springer Nature. doi: 10.1007/s11071-019-05107-1.
Murrell, N., Bradley, R., Bajaj, N., Whitney, J.G., & Chiu, G.T.C. (2019). A Method for Sensor Reduction in a Supervised Machine Learning Classification System. IEEE/ASME Transactions on Mechatronics, 24(1), 197-206.Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/tmech.2018.2881889.
Bajaj, N., Chiu, G.T.C., & Rhoads, J.F. (2018). A megahertz-frequency tunable piecewise-linear electromechanical resonator realized via nonlinear feedback. Journal of Sound and Vibration, 425, 257-274.Elsevier. doi: 10.1016/j.jsv.2018.02.053.
Florence, S., Bajaj, N., & Chiu, G. (2018). Inspiring Future Generations in Stem Field through Robotics Competition: A College Student Mentoring Approach. Mechanical Engineering, 140(03), s13-s17.ASME International. doi: 10.1115/1.2018-mar-5.
Murray, A.K., Novotny, W.A., Bajaj, N., Emre Gunduz, I., Son, S.F., Chiu, G.T.C., & Rhoads, J.F. (2018). Piezoelectric Inkjet-Printed Metallic Igniters. Journal of Imaging Science and Technology, 62(4), 040406-1-040406-6.Society for Imaging Science & Technology. doi: 10.2352/j.imagingsci.technol.2018.62.4.040406.
Pyles, C.S., Bajaj, N., Rhoads, J.F., Weinstein, D., & Quinn, D.D. (2018). The Dynamics of Large Systems of Globally Coupled, Mistuned Electromechanical Resonators. Volume 8: 30th Conference on Mechanical Vibration and Noise, v008t10a003.ASME International. doi: 10.1115/detc2018-86138.
Bajaj, N., Rhoads, J.F., & Chiu, G.T.C. (2017). Characterizing the Spatially Dependent Sensitivity of Resonant Mass Sensors Using Inkjet Deposition. Journal of Dynamic Systems Measurement and Control, 139(11), 114505.ASME International. doi: 10.1115/1.4036873.
Geesey, B.A., Wetherton, B.A., Bajaj, N., & Rhoads, J.F. (2017). Shaping the Frequency Response of Electromechanical Resonators Using a Signal Interference Control Topology. Journal of Dynamic Systems Measurement and Control, 139(3), 031011.ASME International. doi: 10.1115/1.4034948.
Wadas, M.J., Tweardy, M., Bajaj, N., Murray, A.K., Chiu, G.T.C., Nauman, E.A., & Rhoads, J.F. (2017). Detection of Traumatic Brain Injury Protein Biomarkers With Resonant Microsystems. IEEE Sensors Letters, 1(6), 1-4.Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/lsens.2017.2768514.
Bajaj, N., Sabater, A.B., Hickey, J.N., Chiu, G.T.C., & Rhoads, J.F.J. (2016). Design and Implementation of a Tunable, Duffing-Like Electronic Resonator via Nonlinear Feedback. Journal of Microelectromechanical Systems, 25(1), 2-10.Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/jmems.2015.2493447.
Sung, S.H., Bajaj, N., Rhoads, J.F., Chiu, G.T., & Boudouris, B.W. (2016). Radical polymers improve the metal-semiconductor interface in organic field-effect transistors. Organic Electronics, 37, 148-154.Elsevier. doi: 10.1016/j.orgel.2016.06.020.
Bajaj, N., Subbarayan, G., & Garimella, S.V. (2012). Topological design of channels for squeeze flow optimization of thermal interface materials. International Journal of Heat and Mass Transfer, 55(13-14), 3560-3575.Elsevier. doi: 10.1016/j.ijheatmasstransfer.2012.03.020.
Hinds, T., Ban, H., & Bajaj, N. (2023). Design and Numerical Simulation of a Multi-Measurand Resonant Sensor. In 13th Nuclear Plant Instrumentation, Control & Human-Machine Interface Technologies (NPIC&HMIT 2023), (pp. 391-400).American Nuclear Society. doi: 10.13182/npichmit23-41546.
Rahimpour, S., Bajaj, N., Shah, S.Y., Pyles, C., Weinstein, D., Rhoads, J.F., & Quinn, D.D. (2023). The Dynamics of a System of N Coupled MEMS-Colpitts Oscillators. In Volume 12: 35th Conference on Mechanical Vibration and Sound (VIB).ASME International. doi: 10.1115/detc2023-116557.
Oldiges, A., & Bajaj, N. (2022). Control, Sensor Calibration, and Parasitic Torque Cancellation of a Dual-Rotor Haptic Actuator. In 2022 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM), 00, (pp. 1763-1770).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/aim52237.2022.9863281.
Mynderse, J.A., Lotfi, N., Bajaj, N., Vikas, V., & Gennert, M.A. (2020). Work in progress: Mechatronics and robotics engineering definitions among students, educators, and industry professionals. In ASEE Annual Conference and Exposition, Conference Proceedings, 2020-June.
Siefker, Z.A., Boyina, A., Braun, J.E., Zhao, X., Boudouris, B.W., Bajaj, N., Chiu, G.T.C., & Rhoads, J.F. (2020). A Chemiresistive CO2 Sensor Based on CNT-Functional Polymer Composite Films. In 2020 IEEE SENSORS, 00, (pp. 1-4).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/sensors47125.2020.9278681.
Habermehl, S.T., Bajaj, N., Shah, S.Y., Weinstein, D., Quinn, D.D., & Rhoads, J.F. (2019). Synchronization in a Network of Coupled MEMS-Colpitts Oscillators.
Murray, A.K., Meseke, J.R., Bajaj, N., & Rhoads, J.F. (2019). Addressing Sensing Statistics through Oscillator-Based Sensing Arrays. In 2019 IEEE SENSORS, 00, (pp. 1-4).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/sensors43011.2019.8956739.
Pyles, C.S., Bajaj, N., Rhoads, J.F., Weinstein, D., & Quinn, D.D. (2019). Threshold Color Sensing Using Coupled Oscillator Networks. In 2019 IEEE SENSORS, 00, (pp. 1-4).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/sensors43011.2019.8956835.
Siefker, Z.A., Murray, A.K., Zhao, X., Boudouris, B.W., Bajaj, N., Chiu, G.T.C., & Rhoads, J.F. (2019). A Resonant CO2 Sensor Functionalized with a Polymerized Ionic Liquid. In 2019 IEEE SENSORS, 00, (pp. 1-4).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/sensors43011.2019.8956534.
Pyles, C.S., Bajaj, N., Weinstein, D., Quinn, D.D., & Rhoads, J.F. (2018). The Dynamics of Large-Scale Arrays of Globally Coupled, Mistuned Micromechanical Resonators (3rd place award in IDETC 2018 VIB). In ASME 2018 IDETC/CIE: The 2018 ASME International Design Engineering Technical Conferences, 30th Conference on Mechanical Vibration and Noise.
Bajaj, N., Chiu, G.T.C., & Rhoads, J.F. (2017). Poster: Electronic feedback-enabled microresonators with intentional nonlinearities.
Bajaj, N., Chiu, G.T.C., & Rhoads, J.F. (2017). Technical Brief: MHz-frequency tunable piecewise-linear electromechanical resonator realized via nonlinear feedback.
Bajaj, N., Murrell, N.J., Whitney, J.G., Allebach, J.P., & Chiu, G.T.C. (2016). Expert-Prescribed Weighting for Support Vector Machine Classification. In 2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM), (pp. 913-918).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/aim.2016.7576885.
Bajaj, N., Rhoads, J.F., & Chiu, G.T.C. (2016). Characterization of Resonant Mass Sensors Using Inkjet Deposition. In Volume 2: Mechatronics; Mechatronics and Controls in Advanced Manufacturing; Modeling and Control of Automotive Systems and Combustion Engines; Modeling and Validation; Motion and Vibration Control Applications; Multi-Agent and Networked Systems; Path Planning and Motion Control; Robot Manipulators; Sensors and Actuators; Tracking Control Systems; Uncertain Systems and Robustness; Unmanned, Ground and Surface Robotics; Vehicle Dynamic Controls; Vehicle Dynamics and Traffic Control, (p. v002t26a005).ASME International. doi: 10.1115/dscc2016-9803.
Singh, Y., Bajaj, N., & Subbarayan, G. (2016). Simultaneous Thermal/Flow Characterization of Thermal Interface Materials. In 2016 15th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm), (pp. 1360-1365).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/itherm.2016.7517707.
Bajaj, N., Sabater, A.B., Hickey, J.N., Chiu, G.T.C., & Rhoads, J.F. (2015). Technical Brief: A tunable, Duffing-like electromechanical resonator realized via nonlinear feedback for sensing applications.
Bajaj, N., Boley, J.W., Fulton, A., & Chiu, G.T.C. (2014). Syringe Position Control for Back Pressure Modulated Drop Volume in Functional Inkjet Printing. In Volume 1: Active Control of Aerospace Structure; Motion Control; Aerospace Control; Assistive Robotic Systems; Bio-Inspired Systems; Biomedical/Bioengineering Applications; Building Energy Systems; Condition Based Monitoring; Control Design for Drilling Automation; Control of Ground Vehicles, Manipulators, Mechatronic Systems; Controls for Manufacturing; Distributed Control; Dynamic Modeling for Vehicle Systems; Dynamics and Control of Mobile and Locomotion Robots; Electrochemical Energy Systems, (p. v001t12a004).ASME International. doi: 10.1115/dscc2014-6289.
Bajaj, N., Chiu, G.T.C., & Allebach, J.P. (2014). Reduction of Memory Footprint and Computation Time for Embedded Support Vector Machine (SVM) by Kernel Expansion and Consolidation. In 2014 IEEE International Workshop on Machine Learning for Signal Processing (MLSP), (pp. 1-6).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/mlsp.2014.6958875.
Fulton, A., Boley, J.W., Bajaj, N., & Chiu, G.T.C. (2014). Drop Volume Modulation via Applied Backpressure in Inkjet Systems. In NIP & Digital Fabrication Conference, 2014: International Conference on Digital Printing Technologies, (pp. 20-25).
Krishna, K., Diana, S., Paul, K., Nikhil, B., Jen-Hau, C., Elina, S., & Todd, S. (2012). Numerical and Experimental Studies of Ultra Low Profile Three-dimensional Heat Sinks (3DHS) Made using a Novel Manufacturing Approach. In 13th InterSociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, 1, (pp. 466-474).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/itherm.2012.6231468.
Bajaj, N., Subbarayan, G., & Garimella, S.V. (2010). Topological Design Optimization of Nested Channels for Squeeze Flow of Thermal Interface Materials. In Volume 4: Electronics and Photonics, (pp. 427-436).ASME International. doi: 10.1115/imece2010-40953.
Bajaj, N., Subbarayan, G., & Garimella, S.V. (2010). SQUEEZE FLOW CHARACTERIZATION OF PARTICLE-FILLED POLYMERIC MATERIALS THROUGH IMAGE CORRELATION. In 2010 12th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, (pp. 1-6).Institute of Electrical and Electronics Engineers (IEEE). doi: 10.1109/itherm.2010.5501302.
Bajaj, N., Shah, S.Y., Pyles, C.S., Weinstein, D., Quinn, D.D., & Rhoads, J.F. Technical Brief: The Dynamics of a MEMS-Colpitts Oscillator.
Habermehl, S.T., Bajaj, N., Shah, S.Y., Weinstein, D., Quinn, D.D., & Rhoads, J.F. Technical Brief: Synchronization in a Network of Coupled MEMS-Colpitts Oscillators.
Rhoads, J.F., Chiu, G.T.C., Bajaj, N., & Sabater, A.B. (2018). US Patent No. 9927287: Nonlinear mass sensors based on electronic feedback and methods of using the same.
Rhoads, J.F., Chiu, G.T.C., & Bajaj, N. (2017). Provisional: US Patent Application 62597976.: Nonlinear mass sensors based on electronic feedback.
Wadas, M.J., Tweardy, M., Bajaj, N., Murray, A.K., Chiu, G.T.C., Nauman, E.A., & Rhoads, J.F. (2017). Provisional: US Patent Application 62534374.: Method of detecting a substance.
Murrell, N.J., Whitney, J.A.G., Bradley, R.T., Bajaj, N., Chiu, G.T.C., & Allebach, J.P. (2016). US Patent Application, Pub. No.: US 2016/0044195 A1, Imaging device and method for sensing media type.
Bajaj, N., & Madsen, L.W. (2014). US Patent No. 8922399: Force sensitive input devices and methods.
Bajaj, N., & Madsen, L.W. (2014). US Patent No. 8717202: Force sensitive input devices and methods.