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Reproducible, robust robot control is particularly challenging at the microscale, where lesser understood surface forces, such as friction, dominate volumetric forces, such as magnetic attraction. In such an environment, an adaptive (or “uncalibrated”) controller which can dynamically adjust to changes in the operation environment is essential. This paper describes an uncalibrated controller utilizing...
A finite element model for Quartz Enhanced Photoacoustic Spectroscopy (QEPAS) was developed and applied to study the dependence of performance on sensor dimensions. This model can be a design tool for optimizing tuning fork dimensions.
Light stimulating neural probes are rapidly increasing our understanding of neural pathways. Relocating the externally coupled light source to the probe tip has the potential to dramatically improve the flexibility of the technique. However, this approach would generate heat within the embedded probe where even minor temperature excursions could easily damage tissues under study. A COMSOL model was...
This work explores using a low-cost electroencephalography (EEG) headset to quantify the human response to stressed and non-stressed states. We used a Stroop color-word interference test to elicit a mild stress response in 18 test subjects while recording scalp EEG. EEG signals were analyzed using an algorithm that computed the root mean square voltage in the beta, alpha, and theta bands immediately...
Use of stimulating neural probes has increased in an effort to better understand neural pathways. Current designs using light as a stimulating impulse externally couple the light into the probe. Relocating the light source to the probe tip would improve the flexibility of the technique; however, this approach would generate heat within the embedded probe. Minor temperature excursions can easily damage...
Microrobots have a number of potential applications for micromanipulation and assembly, but also offer challenges in power and control. This paper describes the control system for magnetically actuated microrobots operating at the interface between two immiscible fluids. The microrobots are 20 µm thick and approximately 100–200 µm in lateral dimension. Several different robot shapes are investigated...
Due to their small size, low loss, and compatibility with integrated circuits, microelectromechanical systems (MEMS) have been the focus of recent efforts at developing frequency reconfigurable patch antennas able to operate at a number of different user-selected frequencies. Although reactive loading with MEMS variable capacitors is a well-documented method in reconfigurable antenna design [1], MEMS...
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