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Botswana - questioning an African success story
Botswana has been depicted as an African success story having the highest long-run growth rates over the last four decades since independence combined with a stable multi-party democratic system. In this paper the success story is critically investigated and analysed from a structural perspective. The question is posed if Botswana's success truly is a case of economic development as opposed to gro
al-Mu'aladjat al-Buqratiyya: an Arabic medical encyclopedia from the 10th century
Organisters improvisation
Establishing an optimal work cycle for an alternative wheel loader concept
Raytracing in the compensation of the peripheral optics of the eye
III-V and III-Nitride Nanowires for Light Emitting Device Applications
Literature as Metatext between Music and Life
Sum rules and physical bounds on passive metamaterials
Frequency dependence of the permittivity and permeability is inevitable in metamaterial applications such as cloaking and perfect lenses. In this paper, Herglotz functions are used as a tool to construct sum rules from which we derive physical bounds suited for metamaterial applications, where the material parameters are often designed to be negative or near zero in the frequency band of interest.