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Propagation prediction at 2.5 GHz close to a roof mounted antenna in an urban environment

This study investigates the accuracy with which a simple propagation model based on geometrical optics (GO) and uniform theory of diffraction (UTD) can be used to predict the fading characteristics near a base station. The model uses both standard first order three dimensional GO and UTD to simulate near field propagation at the base station. Simulation results are compared with data from a measur

Sum rules and physical bounds in electromagnetic theory

Sum rules are useful in many branches of physics and engineering as they relate all spectrum parameter values with their asymptotic expansions. Properties of the dynamic response can hence be inferred by the, in many cases much simpler, static response. This has e.g., been used for lossless matching networks, radar absorbers, extinction cross section, partial realized gain of antennas, high-impeda

Regulating third party assurance engagements on sustainability reports in Sweden – issues and challenges

The well-institutionalised notion of audits put forth that information subjected to independent examination by third parties potentially contribute to better quality information for decision making (towards more sustainable companies?). The presence of different assurance providers offering a myriad of services in the name of “sustainability assurance” led to concerns about their quality and compa

Being there

This paper examines the use of the Internet as experienced by people with significant mobility/physicalimpairments who are accustomed to using computers. The study is based on interviews andfocuses on computer usage in everyday action and interaction. In many cases, the possibilities thatthe computer and Internet offer have meant not only important improvements in quality of life, butfirst-time oc

Walking the Walk: Inside Ownership and Selective Hedging

Firms’ derivative portfolios are largely unpredictable, in the sense that the previous year’s portfolio is a poor predictor of the current one. This unpredictability partly reflects a common corporate practice known as ‘selective hedging’, i.e. adjusting the timing and size of hedging programs bases on market views. In this paper I examine if corporate governance arrangements influence the extent