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The transport and gain properties of quantum cascade (QC) structures are investigated using a nonequilibrium Green's function (NGF) theory which includes quantum effects beyond a Boltzmann transport description. In the NGF theory, we include interface roughness, impurity, and electron-phonon scattering processes within a self-consistent Born approximation, and electron-electron scattering in a mea
Accelerator based lightsources are one of the most powerful tools today for producing high intensity radiation at very short wavelengths. While synchrotron storage rings provide a high average brilliance in a wide wavelength range, the next generation of lightsources aim towards producing ultra-short pulses in the X-ray regime. A very promising technique implemented or proposed at many accelerat
Digital educational games have been around for a long time and have shown to be pedagogically valuable. Unfortunately most games do not utilize technology to the extent that is possible. Not the least this applies to mathematical educational games for younger children. This work aims to combine several educational scientific approaches using current technologies, which traditionally had been very
With innovation taking centre stage in the global quest for economic development in recent years, Sweden’s southernmost county of Skåne has set out to become Europe’s most innovative region by 2020. Supporting and developing youth’s innovative capacity is viewed as one of the several ways to achieve this goal. This thesis looks at the relationship between youth innovation and spaces where it is en
Ammonia (NH3) is an important chemical both as a chemical precursor and in its own right. It is therefore of practical importance to be able to visualize ammonia gas especially when ammonia is present in combustion or flue-gas environments. This thesis is focused on the use of laser-induced fluorescence with the stated aim of imaging ammonia in low concentrations, with the end-goal of applying the
This study assesses the impacts of the floods in early 2011 in the Northern Cape Province in South Africa and focuses especially on the small town Keimoes located on the major Orange River. During this period 33 municipalities in 7 out of the country’s 8 provinces were declared as disaster areas due to widespread flooding. In Keimoes and the Northern Cape Province the flood impacts were widespread
This thesis is based on the two months I spent in Bolivia doing applied cultural analysis for a nongovernmental organization (ECAM) that works for women empowerment and gender equality. My intention is to explore the relationship between academia and activism by focusing on the approaches that have been pointed out as counterproductive in the struggle for gender equality. Specifically, the objecti
The thesis explores the possibilities of the Swedish government to assure effective waste collection policies for mercury-containing gas-discharge lamps (GDL) in the context of phase-out of incandescent light bulbs. The study includes review of the waste collection, the waste collection evaluation, policy review and policy analysis. The specific analytical tools applied include Lindhqvist’s policy
Ett första steg i arbetet att uppskatta kolflödet mellan landbaserade ekosystem och atmosfären är att så precist som möjligt analysera kvantiteten ovanjordisk biomassa. LiDAR teknologi har i detta avseende visat sig vara ett värdefullt verktyg. Det överlöpande målet med denna studie är att utveckla en förenklad metod, baserad på fjärranalys, för att uppskatta ovanjordisk biomassa för individuella As a first step in the assessment of carbon flux between the terrestrial environment and the atmosphere it is important to accurately quantify the carbon stock of forest ecosystems. LiDAR technology, in this respect, has proved to be a valuable tool, able to provide accurate estimates of aboveground biomass (AGB). The overall goal of this study was to develop a simplified method for assessing AGB
With the evolving technology of mobile electronics and other forms of communication methods, an increasing demand of speech intelligibility is introduced. In a conference room for example, multiple microphones are placed directly in front of the speaker in order to pick up clean speech. However, several challenges still exist. For instance the distance between speaker and microphone will not be fi
The purpose of this thesis is to investigate the impact of exchange rate volatility on aggregate foreign trade. We use annual data from 15 Asian countries over 30 years. The exchange rate volatility is derived primarily based on GARCH models and MASD. This thesis applies both the static fixed-effect panel data model and dynamic GMM model, then compares the obtained results and uses the OLS method
Light dark matter is a hypothesized form of dark matter in the 1 MeV to 1 GeV mass range. The Light Dark Matter eXperiment (LDMX) is an upcoming experiment to test the existence of light dark matter, by colliding an electron beam with a tungsten target and assembling a set of events that potentially indicate the existence of light dark matter. The three main detector components of the LDMX are a s
The food system accounts for a significant portion of environmental degradation, while it is at the same time to a large extent producing food that is deteriorating to human health. The private sector plays an essential role in contributing to the sustainability of the system. Based on a systematic literature review, we conceptualise the notion of sustainable nutrition (SN), which highlights the i
This paper examines the sufficiency of a trading method based on singular value decomposition (SVD) of past stock prices. The SVD method is frequently used as a tool to reduce data noise, compress big-data, and analyse data components. Hence, the method is well suited to form a ground for a predictive tool of price developments. From the predicted pattern, a strategy was formed by construction of
This thesis work deals with the determination of mass- and heat transfer coefficients for pharmaceutical vial freeze-drying and the one-dimensional steady state computer modelling of primary drying. The overall heat transfer coefficient K_V for the vial/freeze-dryer system was successfully determined using a gravimetric method. The overall resistance to mass transfer R_p was successfully determine
Within the next thirty years, two thirds of the human population will live in a city. This growing urban population requires a major shift in the way we produce and distribute food, since industrial agriculture practices contribute to climate change, biodiversity losses, pollution of waterways, soil degradation, etc. Urban and peri-urban agriculture and forestry (UPAF) represent one of the strateg
Synchrotron and Free Electron Laser (FEL) light is becoming an increasingly sought after tool for almost all scientific research aspects. MAX IV Laboratory introduced the first 4th generation light source that provides the brightest synchrotron light in the world. Since all of the experiments at MAX IV rely only on Insertion Device (ID) radiation, the need for improving ID technology has subsequen
Given the recent predominant role of technology and the extensive use of smartphones in today’s society, the mobile device has become a major part of consumers’ daily lives. As a result, the lines between humans and technology have become blurred, where the effectiveness of interpersonal interactions at the service encounter in retail stores has been questioned. The researchers thus identified a k
The purpose of this thesis was to explore the Swedish pharmacy market and the potential influence different levels of legal pressure have on sustainability reporting. Interviews with pharmacy representatives and document analysis of sustainability reports and policies were combined, grounded in a constructivist perspective to analyze incentives for sustainability reporting. The data collected was
