Sökresultat

This thesis investigates the concept of synthetic inertia, especially in relation to wind power. Further, the ability of wind power to contribute with frequency regulating ancillary services, through synthetic inertia, to the power system is examined. Synthetic inertia is defined as a concept that encompasses a variety of techniques, production methods, and control strategies that provide the grid

Bioenergy is perceived to play a vital role in climate mitigation, transition to renewable energy consumption, energy security, and local and rural socio-economic development. However, exploiting renewable bioenergy resources may need to be more sustainable in the current predominant paradigm. In this study, we raise two broad research questions: (1) what are the significant challenges to the curr

Given the assumptions of rational choice, this essay explicates the distributive consequences of different ethical positions and how the relationship between eth-ics and distributions provides a rationale for a struggle for moral authority for the purpose of procuring distributive shares. The argument provides a partial answer to the question of why there is political struggle in all human societi

This study discusses the effects of economic development on female labor force participation rates in Turkey in 1980-2000 within the framework of U-shaped hypothesis. In addition to the effects of economic development, other determinants of female labor force participation are also analyzed in five different econometric models. Descriptive statistics including time series evidences are exhibited i

The World Health Organization rapports general low adherence to medical treatments in long term therapies among developed countries. The aim of this study was to analyse the individual variation in drug adherence to long term use. A set of individual data with people interviewed in year 2004/2005 was created from the Swedish Survey of Living Conditions and the Pharmaceutical Registry. The data set

Hemoglobin (Hb)-based oxygen carriers (HBOCs) have been engineered to replace or augment the oxygen carrying capacity of erythrocytes. However, clinical results have generally been disappointing, in part due to the intrinsic oxidative toxicity of Hb. The most common HBOC starting material is adult human or bovine Hb. However, it has been suggested that fetal Hb may offer advantages due to decrease

Objective. To investigate the relationship between migration status and sedentary leisure-time physical activity status in the city of Malmö, Sweden. Methods. The public health survey in 1994 is a cross-sectional study. A total of 5600 individuals aged 20-80 completed a postal questionnaire. The response rate was 71%. The population was categorized according to country of birth. Multivariate analy

The analysis of stable isotopes assisted in identifying that groundwater in the Punata alluvial fan is mainly recharged by heavy flash floods, and the recharge from rainfall is of less importance. In addition, the hydrochemical analysis identified the Pucara River as the main source of recharge. Other streams in the north and northwest of the fan do not seem to contribute to the recharge. The hydr

Stomatopods have an elaborate visual system served by a retina that is unique to this class of pancrustaceans. Its upper and lower eye hemispheres encode luminance and linear polarization while an equatorial band of photoreceptors termed the midband detects color, circularly polarized light and linear polarization in the ultraviolet. In common with many malacostracan crustaceans, stomatopods have

The extraction, supply, market price and recycling of the metals molybdenum and rhenium were modelled using an integrated system dynamics model. The resource estimates made here resulted in significantly larger estimates than earlier studies for molybdenum. Present molybdenum resources are about 75–80 million ton and about 7 million ton has been mined to date. The ultimately recoverable resources

This paper discusses the relevance of transient events of strong large-scale ocean evaporation (SLOE) for the deuteriumexcess of marine boundary layer vapor d using a theoretical framework that invokes the closure assumption. We argue that during SLOE events, d is essentially determined by the evaporation flux signature. Distinct high d during SLOE with global-mean values in the range of 12‰-23‰ d

Removal of cyprinid fish is a widely used biomanipulation tool to transform turbid shallow eutrophic lakes in north temperate regions into a clear water state. We here evaluate the removal of cyprinids from streams as a supplement to lake fishing. Since cyprinids often aggregate in high densities in lake inlet/outlet streams during winter migration, removal of fish in this space-confined habitat m

Animal bedding, a mixture of straw and manure, could be used as a feedstock for bioenergy production, but its heterogeneity poses new challenges in its use in biorefineries. We have investigated the origin of this heterogeneity and quantified it, and discuss its impact on bioenergy production. Samples were collected from the bedding at different points and depths and analysed by first separating t

Music is used in many professional contexts that are not associated, in a traditional sense, with either music therapy or music education. How do professionals in different contexts use music, and how do they describe their thoughts about music in their professional work? Those are the main questions in our inquiry, focusing on narratives about music and health in professional relations. In this p

Does sertraline provide symptomatic relief for chronic breathlessness in people with advanced disease whose underlying cause(s) are optimally treated?223 participants with chronic breathlessness (modified Medical Research Council breathlessness scale ≥2) who had optimal treatment of underlying cause(s) were randomised 1:1 to sertraline 25-100 mg (titrated upwards over 9 days) or placebo for 4 week

In this cumulative incidence study of the entire population of Sweden, we examined the association between neighbourhood income level and injury risks across a comprehensive set of individual variables. The population, stratified by age (0-14, 15-64, and > or =65 years), was followed for incident injury events in 1998. Multilevel logistic regression was used to examine the associations between nei

As a consequence of increased knowledge about health and changed social structures, people tend to grow older and the life expectancy on average keeps on getting higher (Hemström, 2012). The life expectancy of half of the girls and boys born in Sweden during 2011, is 93 respective 91 years old. Today, it is more common that people pass away in their own homes or in retirement homes, than in a hosp