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In this article, the successful implementation of a development cycle for a physics teaching package based on game-like virtual reality software is reported. The cycle involved several iterations of evaluating students' use of the package followed by instructional and software development. The evaluation used a variety of techniques, including ethnographic observation, surveys, student focus groups and conventional assessment. The teaching package included a laboratory manual, instructional support materials and the Real Time Relativity software that simulates a world obeying special relativistic physics. Although the iterative development cycle was time consuming and costly, it gave rise to substantial improvements in the software user interface and in the students' learning experience.

Leveraging advances in additive manufacturing to implement radio frequency sensor technology has gained interest in recent years, motivated in part by the prospect of cost-effective, multi parameter sensing. Herein, aerosol-jet (AJ) printed surface acoustic wave (SAW) devices on LiNbO3 with features at the resolution limit of AJ printing are reported. Compared to previously reported work, these devices demonstrate improved agreement between SAW designed and measured operating frequency at finer printed feature size, increased operating fundamental frequency, and are the first reported exploitation of harmonics of printed SAW sensor devices. Additionally, the application of printed SAWs as electrical resistance sensors and temperature sensors is demonstrated. INDEX TERMS Additive manufacturing, aerosol inkjet, printed sensors, surface acoustic wave (SAW).