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Magnetism of metal-free graphene-based materials
(Lappeenranta-Lahti University of Technology LUT, 2021-12-09)
In the present work, the magnetic properties of several carbon materials were investigated. The materials are sp2 carbon allotropes, the magnetic properties of which are determined by intrinsic carbon properties or are ...
Microwave processes in thin-film multiferroic heterostructures and magnonic crystals
(Lappeenranta-Lahti University of Technology LUT, 2021-11-26)
Artificial spatially periodic magnetic media, known as magnonic crystals (MC), are one of the key building blocks for magnonics widely used for microwave signal processing and data transfer. The general idea of this work ...
Laser powder bed fusion for the manufacture of Ni-Mn-Ga magnetic shape memory alloy actuators
(Lappeenranta-Lahti University of Technology LUT, 2021-12-03)
The ability of the magnetic shape memory (MSM) alloy Ni-Mn-Ga to exhibit large magnetic-field-induced strain (MFIS) of 6-12% makes it a promising actuation material for small devices in which traditional mechanisms and ...
Deep Bayesian approach to eye fundus image segmentation
(Lappeenranta-Lahti University of Technology LUT, 2021-12-09)
Eye diseases cause different retinal abnormalities that can be detected and diagnosed by examining eye fundus images. Due to the rapidly growing amount of data, there is a need for methods that are able to produce meaningful ...
Coherent anti-Stokes Raman scattering spectromicroscopy in biomedical and climate research
(Lappeenranta-Lahti University of Technology LUT, 2022-02-24)
Coherent anti-Stokes Raman scattering spectromicroscopy (CARS SM) is a powerful label-free technique based on intrinsic molecular contrast from nuclear vibrations that provides detailed information on the chemical composition ...
Properties of exchange interactions in magnetic semiconductors
(Lappeenranta-Lahti University of Technology LUT, 2020-12-02)
This dissertation is devoted to the investigation of magnetic properties of nanostructures with magnetic impurities. The properties of electron spin relaxation in magnetically doped quantum well was investigated. It has ...
Interplay of local moments and itinerant electrons
(Lappeenranta-Lahti University of Technology LUT, 2020-10-02)
We have studied the electronic structure of materials whose properties are driven by magnetism. This work requires research with computer simulations based on quantum mechanics laws within the density functional theory ...
Parameter Estimation of Large-Scale Chaotic Systems
(Lappeenranta-Lahti University of Technology LUT, 2020-10-30)
Parameter estimation plays a crucial role in modelling various kinds of phenomena. However, it can be challenging to properly calibrate a model to satisfy the observed quantities and provide reliable forecasts. In the case ...
Statistical parameter identification of reaction-diffusion systems by Turing patterns
(Lappeenranta-Lahti University of Technology LUT, 2020-12-14)
Mathematical models allow a connection to be made between a pattern observed on a macroscopic scale and a hypothetical underlying mechanism. Different mechanisms, however, can result in similar patterns. In developmental ...
Heuristic similarity- and distance-based supervised feature selection methods
(Lappeenranta-Lahti University of Technology LUT, 2019-12-16)
In the field of machine learning, the available data often contain many features to describe phenomena. This can pose a problem since only those features that are relevant to characterize the target concept are needed, ...