A high surface impedance can be achieved in a limited frequency band by using composite structures. Based on the principles of causality, passivity, linearity, and time translational invariance we demonstrate that this bandwidth is bounded by the thickness and magnetic polarizability per unit area of the structure at normal incidence.

Professionals who take part in the building process have long been concerned with the same environmental factors, e.g. spatial layout, capacity, and function, as well as user demography. Through the knowledge gained on the ways environmental factors affect users of buildings, the need to understand how to handle these factors has grown, due to their influence on the building process. It will be sh

Popular Abstract in Swedish I Sverige analyseras omkring 40 000 DNA-prover från brottsplatser varje år. DNA-profilerna jämförs mot DNA-profiler från misstänkta personer och kan på så vis användas för att knyta en person till ett brott. Alla typer av kroppsvävnader kan analyseras, såsom blod, saliv och hudceller. Vanliga bevismaterial är cigarettfimpar, flaskor, burkar och kläder. De material som cDNA evidence, linking perpetrators to crime scenes, is central to many legal proceedings. However, crime scene samples often contain extraneous substances that may interfere with the PCR-based forensic analysis, resulting in partial or negative DNA profiles. Extensive DNA purification may remove inhibitors, but involves the risk of DNA loss. In this work, pre-PCR processing was applied to improve

Popular Abstract in Swedish Entusiasmen över de stora landvinningarna inom läkemedelsområdet skuggas av en ökad medvetenhet om läkemedelsrelaterade problem samt av höga och ökande läkemedelskostnader. De bevisade effekterna i rigoröst kontrollerade kliniska prövningar motsvaras inte alltid av en förbättrad hälsa när läkemedlet når större spridning i samhället och sjukligheten bara blir en av mångaThe influence of socioeconomic factors on drug utilisation has been studied by pharmacoepidemiological analyses involving 1) drugs that are used to cure disease, such as antibiotics, 2) drugs that are used to alleviate symptoms, such as weak opioids, and 3) drugs that are used to prevent disease, such as statins. In a large Swedish city (Malmö), the utilisation of four major drug groups (ATC-grou

Experimental and numerical investigations of the ignition of hydrogen/air mixtures by jets of hot exhaust gases are reported. An experimental realisation of such an ignition process, where a jet of hot exhaust gas impinges through a narrow nozzle into a quiescent hydrogen/air mixture, possibly initiating ignition and combustion, is studied. High-speed laser-induced fluorescence (LIF) image sequenc