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The relevance of grassroots innovations for higher citizen participation in the sustainability transition of electricity systems has been progressively increasing. Renewable energy cooperatives are grassroots innovations that envision an electricity system where citizens become producers and consumers of electricity from renewable sources instead of being dominated by big energy companies dependen
Freevalve AB develops camless valvetrains for internal combustion engines using pneumatic and hydraulic systems. An air compressor is used to generate pressure in the pneumatic system. To further increase efficiency of the Freevalve system, a new compressor tailored to its purpose, is being developed in house. This thesis is part of the development of this compressor, which is a reciprocating pis
Psykiatriska diagnoser leder till längre sjukskrivningar än de flesta andra sjukdomar och sjukfallslängden har ökat över tid. En av de främsta orsakerna till detta är utmattningssyndrom [UMS]. UMS kännetecknas bland annat av social isolering. Gemenskaper på internet för individer som lider av utmattningssyndrom är dock välbesökta. Med netnografisk explorativ ansats undersöktes en privat Facebookg
This research is based on the hypothesis that the EU water legislation establish river basin management rules which are based on better scientific knowledge and available technologies than the existing national policy and legal framework supporting water management in Uganda. It is however acknowledged that the requirements of the existing EU water policies are hardly often directly applied to the
A growing environmental issue today is the amount plastic pollution in the ocean. To investigate how it might affect marine life, an important aspect is to study how plastics are transported by ocean currents and where it ends up. This can be done by use of Lagrangian simulation of plastic particles in computer ocean models. To improve the quality of the output from such simulations the number of
Smart specialisation (S3) policy framework, while presuming limited policy involvement during the first phases of implementation, requires higher regional management control over the processes of adaptation and monitoring. It brings up requirements for integrated methods towards monitoring and evaluation to make sure continuity and flexibility of the RIS policy framework. Introduction of monitorin
Streptomyces species are filamentous bacteria from the phylum Actinobacteria in which cell elongation occurs at the poles of the cell. This differs from many other bacteria like Escherichia coli where cell elongation occurs by insertion of peptidoglycan in the lateral wall. An essential protein for polar growth in Streptomyces is the coil-coiled protein DivIVA. DivIVA has an essential role in orch
Bioplastics are a promising alternative for petroleum-based plastics that today is on high demand in our contemporary lifestyles. They are made from biopolymers such as polyhydroxyalkanoates (PHAs). Producing biopolymers from waste material feedstock using microbes increases profitability and environmental benefits as well as sustainability for biorefineries. Saccharomyces cerevisiae is a robust m
This thesis focuses on predicting the usage efficiency of e-scooters through the application of a Spatio-Temporal Graph Neural Network (STGNN). The predictions made by the STGNN will be compared with classical machine learning (ML) methods, including Random Forest (RF), Artificial Neural Network (ANN), and Linear Regression (LR). To facilitate the prediction of usage efficiency, the Time to Bookin
As technology progresses, it seems to become increasingly inevitable for everyday objects in our homes to incorporate advanced features, to increase functionality, convenience, and energy management. This master’s thesis presents the continuation of a Bluetooth lighting system, aiming to develop a comprehensive website solution for handling the provisioning and configuration of Bluetooth Mesh devi
Purpose/Background Patients receiving whole brain radiotherapy (WBRT) today are treated with an immobilisation mask which fully covers their face and therefore might be experienced as uncomfortable and claustrophobic. In recent years, optical surface scanning (OSS) systems have been implemented for patient positioning and real-time motion monitoring [1]. OSS systems cannot track the patients surfa
Background/purpose Quantitative susceptibility mapping (QSM) is an MRI-based post processing technique to evaluate the magnetic susceptibility, χ, of human tissue using phase data. While brain imaging has been the most common application, other areas have also raised interest. For example, QSM of the articular cartilage of the knee has been suggested as a means to study the degeneration of this ti
This Master's thesis in Biomedical Engineering investigates the performance and generalizability of linear regression models in context of prosthesis control for short residual limb amputees. This thesis uses intramuscular electromyography data, and a regression and emplys a regression technique called Elastic Net Regression - a technique that combines L1 and L2-regularization - to predict 1-D
Renewable Energy Communities (REC) are seen as a way to promote energy justice and security and advance a democratic, socially-just energy transition. However, energy justice scholarship indicates that some social groups are not included in RECs. I conducted four semi-structured interviews with urban RECs in Germany to find out which communities are underrepresented and why. The feminist energy ju
Terahertz radiation is a useful tool for inducing lower-energy excitations in matter, where it can be used to cause structural changes through direct interaction with the crystal lattice. Sub-picosecond optical pulses can be used to generate intense broadband terahertz pulses through optical rectification in nonlinear crystals, reaching peak electric fields of several MV/m and conversion efficienc
In 2021, the Icelandic government stated that Iceland will implement an energy transition plan with the goal of becoming a 100% carbon neutral and fossil free nation by 2040, furthermore, that a doubling in renewable energy production was needed to reach that goal. This led to an upsurge of a discourse among stakeholders and concerned citizens about the future of Iceland. This thesis is an attempt
Kapitlet beskriver rehabiliteringsteknikens bidrag till hur vi kan tänka om äldre och teknik som främjar ett modernt äldreliv och ger exempel på hur äldres erfarenheter och behov kan vara utgångspunkten för utvecklingen av produkter och tjänster.
Gaussian Mixture Model (GMM)-based vector quantization of Line Spectral Frequencies (LSFs) has gained wide acceptance in speech coding. In predictive coding of LSFs, the GMM approach utilizing Kalman filtering principles to account for quantization noise has been shown to perform better than a baseline GMM Recursive Coder approaches for both clean and packet loss conditions at roughly the same com
