A new beam line for generating a sub-micron beam spot for high-resolution nuclear microprobe applications has been constructed at the Lund nuclear microprobe facility. In this paper, the first in a series of three, a detailed theoretical investigation of different focusing systems is presented based on calculations performed with the computer programs PRAM and OXTRACE. Comparison is made between a

Popular Abstract in Swedish Syftet är att dels studera olika ventilationssystems förmåga att tillföra och föra bort luftflöden. Den andra delen av syftet är att studera konstruktionskriterier och energi användning för ett variabelflödessystem baserat på konstanttryckshållning av det statiska trycket på grenkanalnivå och som endast tillför uteluft. Ventilationssystemens luftflöden studeras med hjälOne part of the objective is to analyze how different ventilation systems perform in practice when it comes to supplying and exhausting designed air flow in different outdoor and indoor conditions. The other part is to analyze the design criterias and the energy use of a variable air volume system based on controlled static pressure at the branch duct level and supplying outdoor air only. To inves

Background: Since the cloning in 1990 of cDNA corresponding to mRNA transcribed at the blood-group ABO locus, polymorphisms due to ethnic and/or phenotypic variations have been reported. Some subgroups have been explained at the molecular level, but unresolved samples are frequently encountered in the reference laboratory. Results: ABO blood grouping discrepancies were investigated serologically a

Abstract is not available.

In 98 patients undergoing elective vascular surgery, specimens for bacterial cultures were obtained from urine, ischaemic ulcers, incisional wounds and the implanted grafts. Wound and graft infections were registered and compared with the results of these cultures and suspected risk factors in an attempt to find the source of infections. Antibiotic prophylaxis with cefuroxime was given for 24 h be

Popular Abstract in Swedish Återkoppling är en fundamental princip inom reglertekniken. Genom att mäta vissa variabler kan andra påverkas så att ett system uppför sig på önskat vis. Denna doktorsavhandling behandlar två typer av återkoppling: reläåterkoppling och flervariabel återkoppling. Reläåterkoppling är den enklaste formen av återkoppling. Endast tecknet på en uppmätt variabel återkopplas: This doctoral thesis treats three issues in control engineering related to relay feedback and multivariable control systems. Linear systems with relay feedback is the first topic. Such systems are shown to exhibit several interesting behaviors. It is proved that there exist multiple fast relay switches if and only if the sign of the first non-vanishing Markov parameter of the linear system is pos

Software quality can be defined as the customers' perception of how a system works. Inspection is a method to monitor and control the quality throughout the development cycle. Reading techniques applied to inspections help reviewers to stay focused on the important parts of an artifact when inspecting. However, many reading techniques focus on finding as many faults as possible, regardless of thei

Two ring handles were found in Uppåkra by the archaeological excavations. The first one was found by metal detector survey near the church of Uppåkra and was assumed to have beonged to the medieval Church that in the 19:th cent. was replaced by the modern church. The other ring handle was found by in one of the foure large postholes in the cult house and was dated to 500-600 A.D. The ring handles

DNA chemical and physical networks have been investigated with respect to their stability and swelling, and rheological properties. Chemical networks were prepared by cross-linking DNA with ethylene glycol diglycidyl ether (EGDE), and physical networks by association with cationic polymers. Both types of gels display strong elastic properties and have a shear thinning behaviour. Addition of cation

Popular Abstract in Swedish Inom de flesta sociologiska forskningsperspektiv tillskrivs mellanmänsklig interaktion avgörande betydelse för att förstå olika aspekter av det sociala livet. I denna studie ligger emellertid fokus på den praktiska och erfarenhetsmässiga relationen mellan människor och ting ? en relation med stor betydelse för individers identitet och sociala liv. Detta är ett ofta bortIn most sociological paradigms the importance of human interaction for the understanding of societies, is a well established fact. In this study, the focus is the interaction between human beings and material things as it is occurring in practice. Such an approach with its important consequences for understanding both social life and self, is often overlooked in studies within the field of sociolo