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Friction-related problems are frequently encountered in control systems. This thesis treats three aspects of such problems: modeling, analysis, and friction compensation. A new dynamic friction model is presented and investigated. The model is described by a first order nonlinear differential equation with a reasonable number of parameters, yet it captures most of the experimentally observed frict

A new high-brightness source for soft X-rays and EUV-radiation has been developed. This laser-plasma source utilizes a microscopic liquid droplet or jet as target. The result is a reduction of debris emission by several orders of magnitude compared to conventional laser plasmas. The minute amounts of residual ionic/atomic debris can be obstructed by filters or a localized gas shield. Target liquid

Forskare Kontaktinformation E-post: deniz [dot] koca [at] mgeo [dot] lu [dot] seOrganisation Miljö- och geovetenskapliga institutionen (MGeo) Hämtställe: 16 WebbplatsDeniz Kocas profil i Lunds universitets forskningsportalAndra roller Medlem i Strategiskt forskningsområde BECC: Biodiversity and Ecosystem services in a Changing Climate Forskare Centrum för miljö- och klimatvetenskap (CEC)Läs mer på

https://www.cec.lu.se/sv/deniz-koca - 2026-05-08

Risk analysis and intervention planning are important in fire prevention and risk management strategies. This study has shown that it is possible to use fire safety engineering models to estimate the development of fires on a realistic scale, and the corresponding requirement for extinguishing media. Data from the London Fire Brigade (UK) were used to investigate a possible correlation between the

Although there is a fairly large number of books and articles concerning the validation of technical measurement systems, there are only a few which take into account the whole measurement system consisting of both technical and non-technical aspects. A measurement system comprises both the measurement process and the human being who conducts the measurement. In this way, the human being may be a

The purpose of this thesis is to describe, analyse, and compare the recontextualisation of social pedagogy in three different curricula; in Nijmegen (NL), Lillehammer (N), and Sligo (IRL). The curricula represent different academic orientations and are located in different social-political contexts. The recontextualisation of social pedagogy, the concept derived from the works of Basil Bernstein,

The principles of sanctity of life and quality of life are often appealed to in medical decisions at the "edges of life." Notwithstanding their importance in bioethics, these principles are still badly understood. This study is an attempt to clarify their normative significance and content. Because these principles pertain to the more general question of the value of life, the study begins by exp

A theoretical and experimental study of rack storage fires and responsiveness of sprinklers is presented. Free-burn tests with non-combustible and combustible material were carried out in reduced scale with verification in large scale. Formulas for in-rack flame height, excess gas temperature, gas velocity and heat flux to storage walls are provided. The formulas include overall heat release rate,

This thesis deals with the recent discourse about Hittite ritual and religion and assumes an alternative approach. It analyses how the most important researchers in the fields of Hittitology and History of Religions, who have been working with Hittite rituals and religion, describe and explain the rituals. Their implicit or explicit theories underlying the discourse are explored. The restraining e

This thesis investigates the use of cylinder pressure measurements for estimation of the in-cylinder air/fuel ratio in a spark ignited internal combustion engine. An estimation model which uses the net heat release profile for estimating the cylinder air/fuel ratio of a spark ignition engine is developed. The net heat release profile is computed from the cylinder pressure trace and quantifies the

A tool suitable for conducting industrial fire and explosion hazard analysis is presented, together with an identification of weak links in the hazard evaluation chain. For some of the weak links additional research has been carried out. The tool, "FREIA", evaluates the consequences for humans and components due to fires and accidental releases indoors and outdoors using established engineering m

The objective of this thesis was to find ways to improve combustion and reduce emissions from supercharged natural gas engines. In-cylinder flow measurements were made with laser doppler velocimetry, LDV, heat release was calculated from cylinder pressures and emissions were measured at various locations. The original combustion chamber was a low turbulence-generating geometry, resulting in an ove

This book is about elections and democracy in newly democratizing countries. Building on a new data set of 5,568 observations in 232 elections, it provides evidence elections have a casual impact on improving the quality of democracy in Africa in more than one way. The study demonstrates multiparty elections do not signal the end of transitions to democracy but rather foster liberalization and hav

Essay on the development of the Gunvald Larsson character in the Beck film series 1997-2010.

A noninvasive 133-xenon washout technique was used to evaluate the ventilation of the paranasal sinuses in healthy subjects and in patients with sinus disease. A mixture of air and 133-xenon is insufflated into the nasal cavities and passage into the sinuses is facilitated by a pressure increase created by letting the subjects inflate a balloon. A scintillation camera allowing single photon emissi

Water column and sediment profiles of plutonium, americium, thorium and uranium have been obtained in the superanoxic Framvaren fjord, southern Norway. The concentrations of bomb test fallout Pu, Am as well as 'dissolved' Th in the bottom water are the highest recorded in the marine environment. The behaviour of the actinides in the anoxic water mass is to a large extent governed by the behaviour

The spectrum and energy levels C IV and the 3l4l' system of the Mg-like ions in the iron group elements has been investigated. This has led to several hundred identified transitions, many of them previously unknown. Using the Charge Exchange diagnostic system at JET, ion temperatures, rotation velocities and densities have been derived from visible spectroscopic measurements on fully ionised light

The aim of this dissertation is to study some of the forces behind the transformation of the 20th century industrialised countryside. The emphasis is on changes in everyday life for women and men, and the role of organisations therein. Two main questions are outlined: Which forces were central to the development of the industrial society?, and, how did the relationship between individual and socie