Applied Micro- and Nanosystems
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Approaching theoretical power bound for vibration energy harvesters under displacementconstrained operation
(Doctoral dissertations at the University of South-Eastern Norway;211, Doctoral thesis, 2024)The last decade has witnessed the explosion of the internet of things (IoT), in which sensor networks are indispensable elements. However, most sensors are powered by batteries with limited energy capacities and often ... -
Evaluation of Metallurgical Bonding for Ultrasound Transducers
(Doctoral dissertations at the University of South-Eastern Norway;188, Doctoral thesis, 2024)Common ultrasound transducers use a piezoelectric element to convert between electrical and mechanical energy. The piezoelectric layer is sandwiched between acoustic matching and backing layers to maximize energy transfer ... -
Enhanced Electrochemical CO2 Reduction through Nanostructuring and Light Element Modification
(Doctoral dissertations at the University of South-Eastern Norway;184, Doctoral thesis, 2024)The rising levels of carbon dioxide (CO2) in the atmosphere present a significant challenge to modern society due to its profound impact on the climate. It is therefore crucial to develop and employ carbon-neutral renewable ... -
Novel encapsulation of a medical ultrasound probe
(Doctoral dissertations at the University of South-Eastern Norway;182, Doctoral thesis, 2024)Ultrasound imaging plays an important role in the diagnosis of cardiovascular diseases. A trans-esophageal echocardiography (TEE) probe uses ultrasound waves to image the heart in real time in three dimensions (3D) from ... -
Point of Care COPD Diagnostics Based on Paper-based Assay and Biofluid Sensing
(Doctoral dissertations at the University of South-Eastern Norway;167, Doctoral thesis, 2023)Chronic obstructive pulmonary disease (COPD) has always been the one of the top four major death causes during the last ten years. During the era of covid-19 pandemic, COPD patients faced higher mortality rates than ever ... -
Low Power Circuits and Architectures for Wireless Sensor Networks
(Doctoral dissertations at the University of South-Eastern Norway;166, Doctoral thesis, 2023)Wireless sensor networks (WSNs), due to their multidisciplinary applications, represent one of the main enabling technologies of the Internet-of-Things paradigm. These networks, consisting of sensor nodes characterized by ... -
Improved packaging techniques for LWIR microbolometers
(Doctoral dissertations at the University of South-Eastern Norway;164, Doctoral thesis, 2023)A new generation of Infrared (IR) camera sensors, based on MicroBolometer Arrays (MBA) has been developed. This technology is lower cost and has no need for active cooling, unlike the previous generation. It, therefore, ... -
Impact of single crystal properties on underwater transducer designs
(Doctoral dissertations at the University of South-Eastern Norway;154, Doctoral thesis, 2023)The ongoing robotic revolution in oceanic science puts new requirements on underwater transducers. Small platforms require compact multi-purpose transducers, and there is limited space available for the electronics. ... -
Inductive impedance matching network for Magnetic Resonant Wireless Power Transmission
(Doctoral dissertations at the University of South-Eastern Norway;152, Doctoral thesis, 2023)Inductive wireless power transfer is getting more and more attention as the demand for mobile electronic devices grows. There are already well-functioning wireless charging systems for smartphones, tablets, and electric ... -
Visible light responsive titanium-oxides for enhanced photoelectrochemical water splitting application
(Doctoral dissertations at the University of South-Eastern Norway;134, Doctoral thesis, 2022)Semiconductor-based photoelectrochemical (PEC) water splitting under sunlight has the potential to produce sustainable hydrogen at a low cost and on a large scale. Titanium dioxide (TiO2) is extensively studied as one of ... -
Hierarchical Black Silicon and Their Applications
(Doctoral dissertations at the University of South-Eastern Norway;116, Doctoral thesis, 2022)Black silicon is expected to be a promising material for photoelectric, photothermic, photocatalytic, and microfluidic applications due to its remarkably anti-reflectivity, anti-bacterial effect, hydrophilicity, and ... -
Preparation of novel metal oxides/hydroxides materials and their applications in supercapacitors
(Doctoral dissertations at the University of South-Eastern Norway;89, Doctoral thesis, 2021)Supercapacitors, as next-generation efficient, safe and clean energy storage devices with superior power density, fast charge/discharge rate, excellent temperature adaptability and remarkable service life, significantly ... -
Glucose energy harvester for self-powering of remote distributed bioanalytical microsystems
(Doctoral dissertations at the University of South-Eastern Norway;88, Doctoral thesis, 2021)Implantable medical devices came of age with the artificial pacemaker more than 60 years ago. Their true potential of being located directly where their prosthetic or therapeutic actions are needed will be further enhanced ... -
Local Synthesis of Carbon Nanotubes on CMOS-MEMS Microheaters for Sensing Applications
(Doctoral dissertations at the University of South-Eastern Norway;84, Doctoral thesis, 2020)Research on nanomaterials is growing rapidly due to their extraordinary properties, which can significantly differ from their bulk form. The physicochemical properties of nanoscale materials are diverse and can be engineered ... -
Modeling and design of piezoelectrically actuated MEMS tunable lenses
(Doctoral dissertations at the University of South-Eastern Norway;76, Doctoral thesis, 2020)Autofocus is a crucial feature in cameras, especially when photographing objects at different distances and having them in sharp focus without any quality loss in the captured image. Over the last decade, several research ... -
Layer-specific strain and strain rate : Estimation using miniature transducers attached to the epicardium
(Doctoral dissertations at the University of South-Eastern Norway;68, Doctoral thesis, 2020)Reliable methods to asses ventricular function during and after cardiac surgery are essential tools to evaluate patient prognosis. We presented an ultrasound system to monitor cardiac motion using miniature transducers ... -
Therapeutic dual-frequency ultrasound transducers
(Doctoral thesis, 2020)The interaction of ultrasound with organic and non-organic matter has opened up for a vast industry. Arguably, in medicine, the most known application of ultrasound is diagnostic imaging of fetuses. However, ultrasound can ... -
Evaluation of resolution enhancement in shifted superimposed projection displays: Simulations and experiments
(Doctoral dissertations at the University of South-Eastern Norway;60, Doctoral thesis, 2020)Spatial resolution is one of the key performance parameters of a projected display, and the projector industry continuously aims to increase it. Projector resolution is traditionally based on the resolution of the spatial ... -
Flexible electrochemical sensor platform
(Doctoral dissertations at the University of South-Eastern Norway;54, Doctoral thesis, 2019)Bringing an electroanalytical assay from the laboratory to the level of a commercially or clinically viable product often requires substantial cost, effort and time. While the real value may lie in the assay and sensor ... -
Optically operated pulse-driven Josephson junction arrays and range extension using voltage dividers and buffer amplifiers
(Doctoral dissertations at the University of South-Eastern Norway;52, Doctoral thesis, 2019)Voltage dividers and buffer amplifier combinations can be used to transfer and extend traceability in voltage and electrical power metrology between a wide range of instruments. For voltages up to 1000 V, resistive voltage ...