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The main topic of this PhD thesis is complexity reduction of linear time-invariant models. The complexity in such systems is measured by the number of differential equations forming the dynamical system. This number is called the order of the system. Order reduction is typically used as a tool to model complex systems, the simulation of which takes considerable time and/or has overwhelming memory
This is a study of wool in Icelandic history in a broad context, whereby wool production serves as a channel to central aspects of 18th-century society. The objective is to explore ideas about Iceland’s economy that were current in the 18th century in the light of developments in Denmark at the time, to place these ideas in the context of the recent introduction of workshopmanufacturing to Iceland
Famous for its many New Kingdom stelai and funerary shrines, Speos of Horemheb and magnificent quarries, this paper presents a preliminary report on a lesser acknowledged feature of Gebel el Silsila: its quarry marks. Focusing here on the northern section – Partition B – of Silsila East’s Main Quarry, seventeen individual quarry faces display totally 376 quarry marks, which have been divided into
The Dalby Gospel Book, dating from the eleventh century, is the oldest preserved complete manuscript with a medieval Scandinavian provenance, and has rightly been considered a document of great historical importance. Local patriotism has coloured its attribution by scholars to Dalby, with arguments presupposing judgemental quality assessments, questionable Anglo-Saxon parallells and alleged scriba
Popular Abstract in English News about global warming, discussions about alternative fuels such as natural-gas and biogas, and commercials about gas engines sound familiar to the most people living in modern societies. Why global warming is important? What is the role of natural-gas engines in this subject? Are natural-gas engines efficient? Do they perform as well as diesel engines? If not, why? Most heavy-duty engines are diesel operated. Severe emission regulations, high fuel prices, high technology costs (e.g. catalysts, fuel injection systems) and unsustainably in supplying fuel are enough reasons to convenience engine developers to explore alternative technologies or fuels. Using natural gas/biogas can be a very good alternative due to the attractive fuel properties regarding emissio
Studiens syfte är att undersöka hur flöjtpedagoger yrkesverksamma på kulturskolor i Sverige beskriver sin undervisning med fokus på utveckling av det flöjtistiska hantverket hos nybörjare. Forskningsfrågorna som besvaras är: Vilket/vilka mål har flöjtpedagogerna med sin undervisning? Vilka flöjtistiska byggstenar anser flöjtpedagogerna vara nödvändiga att grundlägga hos nybörjarna? Hur arbetar flöThe aim of this study is to examine how flute teachers, working in the municipal Swedish music schools, describe the music education, focusing on the development of the beginner's technical skills of flute playing from a hermeneutic point of view. The research questions are: What are the flute teachers´ aims of their teaching? What basic skills of flute playing do they consider as important in
Popular science Biogenic volatile organic compounds (BVOCs) are a versatile group of non-methane hydrocarbons (chemical compounds made of carbon and hydrogen) emitted by vegetation. The most common BVOCs from plants are some chemical compounds like isoprene, monoterpenes and sesquiterpenes. BVOCs are involved in plant growth, reproduction and defense mechanisms. Besides, BVOC play an important rol
Water for firefighting is often associated with drinking water, due to fire hydrants. Fire hydrants have been installed in towns for a long time and are one of the most common ways for the rescue service to get hold of water for extinguishing fires. This report evaluates the ways that the rescue service uses their water and how the get continuously water to the fire site. Other extinguishing metho
The Scanian Economic-Demographic Database (SEDD) has been assembled by the Centre for Economic Demography (CED), Lund University. It contains information about the demographic and economic conditions of people that have lived in 5 parishes in Scania from the 17th century until the present. The SEDD database has been integrated with geographic data, which are digitized from four independent histori
Popular science This study is about the water balance of two forest stands. The water balance here means the inflow of the water by rain and outflow by evaporation and groundwater flow. The main question of this research is how increased air temperature and change in the precipitation will affect the water balance of these forests. This has been done through a modeling program which will be descriRecent studies show that future climate change will have a major influence on the water balance of forests in which the projected increase in air temperature and variation in the precipitation around the world are expected to be among the most important drivers affecting the forest’s hydrological cycle. The objective of this study is to compare the water balance of two forests stands in two diff
The thesis discusses closed-loop control of the hypnotic and the analgesic components of anesthesia. The objective of the work has been to develop a system which independently controls the intravenous infusion rates of the hypnotic drug propofol and analgesic drug remifentanil. The system is designed to track a reference hypnotic depth level, while maintaining adequate analgesia. This is complicat
Title: Sing in Swedish! The purpose of this study is to find out how songs and singing could complement Swedish second language education. The method I have used to collect information is qualitative interviews with four persons with different professions: a teacher, a choirleader, a singing teacher and a medical doctor and a laryngologist. The study begins with a few thoughts about my interest in
Att arbetsmarknaden är i ständig förändring råder det ingen tvekan om. Produktionen av både tjänster och varor efterfrågar nya former för förvärvande av arbetsprestationer. Mer eller mindre nya grepp inom företagsvärlden som till exempel utkontraktering och projektanställningar vittnar om detta. Förändringarna gör att gränsdragningen mellan att vara arbetstagare och uppdragstagare inte kan förväntThe labour market is constantly changing. The production of both services and goods are now acquiring labour in new forms. More or less new tendencies in business management such as outsourcing and project assignments are realities today. These changes add complexity to the process of defining whether a person, the work performing part, is to be considered as employed by the principal or as an ent
The aim of this report is to survey the risks connected with home for old people to be able to enhance security and decrease the inherent risks. The goal is to create a tool that will facilitate working with risk management at home for old people, and thus be able to increase security in daily life for the people who live there as well as for personnel and visitors. The starting point of this repo
An elastoplastic topology optimization framework for limiting plastic work generation while maximizing stiffness is presented. The kinematics and constitutive model are based on finite strain linear isotropic hardening plasticity, and the balance laws are solved using a total Lagrangian finite element formulation. Aggregation of the specific plastic work combined with an adaptive normalization sch
