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The Gaia mission of the European Space Agency (ESA) will produce high-precision astrometry for 10^9 objects up to 20th magnitude. The volume of data generated (about 150TB of compressed raw data) and the complexity of the relationships between them make the scientific processing a challenging task. This paper presents the basic concepts of the core of the astrometric data reduction, the AGIS syste
Using a high pressure chamber, different types of lubricants have been studied at pressures representative of elastohydrodynamically lubricated contacts. The three types of lubricants (solid, liquid and gaseous) have been compressed and sheared to measure the compression, the shear stress as a function of pressure and shear velocity, and the solidification pressure. In the high pressure chamber re
Popular Abstract in Swedish Abstract Hydrogen embrittlement is a degradation process of mechanical/tribological properties (toughness, wear etc.) of mating steel surfaces. This is caused by the presence and interaction of hydrogen with applied stresses. Therefore, it is important to quantify the hydrogen content which could be dissolved under applied stresses in steel. Water contamination of lubriAbstract Hydrogen embrittlement is a degradation process of mechanical/tribological properties (toughness, wear etc.) of mating steel surfaces. This is caused by the presence and interaction of hydrogen with applied stresses. Therefore, it is important to quantify the hydrogen content which could be dissolved under applied stresses in steel. Water contamination of lubricants is often considered as
Geophysical investigations using 2-D DC resistivity were carried out on old parts of two similar landfills, with waste of different ages. The data sets, which included high data density in both vertical and horizontal directions, were interpreted with 2-D smoothness constrained inversion. The landfills were excavated after the surveying. The objective was to test the capability of the resistivity
This article seeks to explore how Christian self-understanding has changed as Jewish-Christian relations have enhanced and improved during the last half-century. To what extent are traditional Christological and soteriological models and motifs discussed, defined, redefined, refined or even refuted? Three issues are discussed: the need to (a) go beyond bipolarity (Judaism vis-à-vis Christianity et
Mixed acid phospholipids are valuable compounds, which are used mainly in membrane- and lipoprotein research and in liposome technology. The chemical synthesis of these special lipids is rather difficult and involves both toxic chemicals and harsh reaction conditions, which makes the products less attractive for medical and biological applications. Enzymes in contrast catalyze chemical reactions u
Popular Abstract in Swedish Slaganfall (stroke) är en av de vanligaste orsakerna till invaliditet och död i Västvärlden. I Sverige drabbas cirka 35.000 människor varje år, 25.000 av dessa får sitt första slaganfall, och de flesta är äldre än 70 år vid sjukdomsdebuten. Slaganfall orsakas av att en begränsad del av hjärnan inte får tillräcklig syretillförsel, och detta beror antingen på att blodflödThe thesis investigated clinical, neuroimaging and prognostic features in lacunar infarction. The studies were based on a series of 100 consequtive patients with a first-ever stroke and a lacunar syndrome investigated with CT, Gd-DTPA enhanced MRI, and with respect to large vessel disease and cardioembolic sources. the patients were followed for a mean of 4 years. MRI was repeated one year after s
Jag är andlig – inte religiös – har idag blivit ett uttryck för den moderna människan att relatera sig till de icke-empiriska krafterna. Budskapet är att andlighet förenar mänskligheten och att religion med dogmer och formella ritualer skiljer människor åt. Men hur generell är denna andlighet som här framträder? För att diskutera frågan om en universell andlighet vill jag starta i en annan kontext
Objective: An excessive cardiovascular response to acute stress is a probable risk factor for cardiovascular (CV) disease. Such reactivity is usually assessed from the CV response to laboratory stressors. However, if it is a risk factor, correlated responses must occur in real life. Design: In the present study, we investigated the relationship between the heart rate (HR) response to five laborato
During south Scandinavian Late Bronze Age, c. 900-500 BC, a new tool was invented. It consisted of a wooden shaft and a knife blade made out of flint. One singel of this tool still exists today. It was found in a Danish bog in late 19th century. But there are many of the knife blades of flint; in museum collections or in flint assemblages from archaeological excavations. Archaeologists call them l
