Ana Claudia Arias

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When pressure is applied to a localized area of the body for an extended time, the resulting loss of blood flow and subsequent reperfusion to the tissue causes cell death and a pressure ulcer develops. Preventing pressure ulcers is challenging because the combination of pressure and time that results in tissue damage varies widely between patients, and the(More)
Pulse oximetry is a ubiquitous non-invasive medical sensing method for measuring pulse rate and arterial blood oxygenation. Conventional pulse oximeters use expensive optoelectronic components that restrict sensing locations to finger tips or ear lobes due to their rigid form and area-scaling complexity. In this work, we report a pulse oximeter sensor based(More)
Magnetic resonance imaging is an inherently signal-to-noise-starved technique that limits the spatial resolution, diagnostic image quality and results in typically long acquisition times that are prone to motion artefacts. This limitation is exacerbated when receive coils have poor fit due to lack of flexibility or need for padding for patient comfort.(More)
2.3. Medical Devices and Sensors 9 2.4. Radio Frequency Applications 10 3. Materials 12 3.1. Organic Electronics Materials 12 3.2. Semiconducting Polymer Design 13 3.3. Poly(3-alkylthiophenes) 14 3.4. Poly(thieno(3,2-b)thiophenes 15 3.5. Benchmark Polymer Semiconductors 15 3.6. High Performance Polymer Semiconductors 15 4. Device Stability 16 4.1. Bias(More)
In the present work, we demonstrate a printed alkaline battery fabricated with a polyacrylic acid (PAA)-based polymer gel electrolyte (PGE). The electroactive materials were embedded into a mesh structure providing highly fl exible electrodes. The fl exible alkaline battery showed an open circuit potential of 1.52 V and discharge capacity of 5.6 mAh cm − 2(More)
Advances in wireless technologies, low-power electronics, the internet of things, and in the domain of connected health are driving innovations in wearable medical devices at a tremendous pace. Wearable sensor systems composed of flexible and stretchable materials have the potential to better interface to the human skin, whereas silicon-based electronics(More)
A combination of surface energy-guided blade coating and inkjet printing is used to fabricate an all-printed high performance, high yield, and low variability organic thin film transistor (OTFT) array on a plastic substrate. Functional inks and printing processes were optimized to yield self-assembled homogenous thin films in every layer of the OTFT stack.(More)
Advances in wireless technologies, low-power microelectronic devices, and easy access to the internet have enabled the ability to interconnect electronic objects, so that the objects can communicate with each other, make decisions, and provide users information that helps to improve their life. Towards such an ecosystem, low-cost, wearable, flexible(More)
Dr. A. M. Gaikwad, B. V. Khau, Prof. A. C. Arias Electrical Engineering and Computer Sciences Department University of California Berkeley Cory Hall Berkeley , CA 94720 , USA E-mail: acarias@eecs.berkeley.edu G. Davies, Dr. B. Hertzberg, Prof. D. A. Steingart Department of Mechanical and Aerospace Engineering and the Andlinger Center for Energy and The(More)