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This thesis explores the possibility of redesigning ASSA ABLOY’s industrial door in order to improve sustainability through the use of new materials. The first step of the process involved investigating different parts contained within the door, in order to decide which part of the door should be redesigned. Because of its high environmental impact as well as opportunities for improvement, it was
The peel test is a widely used method for evaluating adhesion in packaging materials. However, the result from a peel test is affected by more factors than only the adhesion. A method, based on beam theory, for calculating the adhesion considering these factors was used and evaluated. This was done by performing peel tests for different materials and peel angles. To obtain more knowledge about how
The purpose of this research is to determine the resistance to stress-corrosion cracking (SCC) of three unidirectional (pultruded) E-glass/polymer composites based on modified polyester, epoxy and vinyl ester resins. The composites have been subjected to a nitric acid solution of pH 1.2 in a newly designed four-point bend fixture. The stress-corrosion process was initiated on the as-supplied surfa
Introduction: Magnetic skyrmions hold great promise for realizing compact and stable memory devices that can be manipulated at very low energy costs via electronic current densities. Methods: In this work, we extend a recently introduced method to describe classical skyrmion textures coupled to dynamical itinerant electrons. In this scheme, the electron dynamics is described via nonequilibrium Gre
We investigate macroscopic interference effects in high-order harmonic generation using a Ti:sapphire laser operating at a 100 kHz repetition rate. The structure and behavior of spectral and spatial interference fringes are explained and analytically described by transient phase matching of the long electron trajectory contribution. Time-frequency mapping due to the temporal chirp of the harmonic
As the dimensions of a structure are decreased towards the nanometer scale, the mechanical response to loading deviates from what is observed macroscopically. This is due to a change in material properties stemming from the relative increase in number of surface atoms as compared to bulk atoms. Surface atoms lack some of their neighboring atoms, leading to a reorganization of the electron clouds a
We have investigated how high-order harmonics generated in rare gases depend on the atomic density. The peak and the profile of the atomic density in the interaction region were measured as a function of the backing pressure and the distance from the nozzle by a differential interferometry technique, The conversion efficiency for the harmonics in the plateau was found to increase approximately qua
As the world is trying to rid itself of its dependence on fossil fuels, the need for renewable energy is rapidly increasing. In the power distribution network (DN), this takes the form of distributed generation (DG) from renewable sources, such as photovoltaic (PV) power production. But as more DG is installed, it can lead to issues in the DN such as overloading and overvoltage when production is
Fundamental relations between information and energy – Building electronic devices that use information as fuel Scanning electron micrograph of a quantum dot structure where the movement of single electrons can be controlled and detected. The movement of a single electron in the structure yields the elemental amount of energy of kT ln(2) related to a single bit of information at temperature T. Fig
https://www.nano.lu.se/phd-project-information-fuel - 2026-07-23
We report on the deterministic preparation of antiferromagnetic Heisenberg spin chains consisting of up to four fermionic atoms in a one-dimensional trap. These chains are stabilized by strong repulsive interactions between the two spin components without the need for an external periodic potential. We independently characterize the spin configuration of the chains by measuring the spin orientatio
This seminar series is organized by the three nanoscience hubs located in the Copenhagen-Lund area. The aim is to to increase awareness about our mutual capabilities and to inspire collaborations. Below, please find the talk abstracts and short bio of the speakers on the Photoluminescence topic. Within a radius of just 25 km, the Copenhagen-Lund region features three strong hubs for nanoscience, w
https://www.nano.lu.se/GCN-seminar-photoluminescence - 2026-07-23
Coda wave interferometry (CWI) has been demonstrated to be a very sensitive tool for detecting early signs of damage in concrete. The choice of frequency in SHM applications, utilizing coda waves, is not straight-forward, as there is a trade-off in sensitivity and possible propagation distances. This study aims to provide some steps in establishing recommendations as to choice of frequency, when d
Popular Abstract in Swedish Denna avhandling handlar om de kvantmekaniska effekter som kan uppstå då man dopar extremt små halvledarstrukturer, och det inflytande detta kan ha på de elektroniska och optiska egenskaperna. Mottot för elektronikindustrin är "mindre, snabbare och billigare". Om man fortsätter göra komponenterna som bygger upp datorer och andra apparater mindre och mindre, hamnar man This thesis deals with the properties of donors placed inside or outside a heterostructure quantum well (QW). The focus of the investigation has been on the formation of resonant states, which are a hybridization of the discrete localized impurity levels and the continuous two-dimensional QW subbands. The impact of such states on the optical properties and the noise spectrum have been investigated
The study of spin transport has emerged at the forefront of condensed matter physics during the last decade. Much of the interest has undoubtedly been sparked by the advent of the spintronics paradigm and the idea of creating novel electronic devices based on the spin degree of freedom of the carriers. However, a great deal of interest is due to the rich physics that emerges from the study of spin
