2003 Copies may be made for personal use only Preface These lecture notes are about the conceptual analysis and formal semantic description of programming languages. They explain how to analyse programming constructs in terms of fundamental concepts, and how to formulate precise descriptions of their intended interpretation using the structural approach to operational semantics. The practical a...

Let A be a C *-algebra. Let A ⊗ A be the minimal C *-tensor product of A with itself and let M (A ⊗ A) be the multiplier algebra of A ⊗ A. A comultiplication on A is a non-degenerate *-homomorphism ∆ : A → M (A ⊗ A) satisfying the coassociativity law (∆ ⊗ ι)∆ = (ι ⊗ ∆)∆ where ι is the identity map and where ∆ ⊗ ι and ι ⊗ ∆ are the unique extensions to M (A ⊗ A) of the obvious maps on A ⊗ A. We ...

In this contribution to the mycoflora of Karaj, notes are given on 28 species of micromycetes (Peronosporales, Erysiphales, Dothideales, Leotiales, Ustilaginales and mitosporic fungi) mainly collected by the authors in various parts of Karaj area. Six species are new records for Iran viz. Ramularia geranii var. geranii on Geranium pyrenaicum, Septoria gallica on Colchicum robustum, Sphaerotheca...

Abstract The Gulf of Naples is an important centre endemism, well known from the floristic point view, but much less phytosociological one. In this paper we investigated non-forest vegetation focusing on communities rich in endemics. We described two as new: Eryngio amethystini-Santolinetum neapolitanae for garrigues limestone, Globulario neapolitanae-Loniceretum stabianae dolomitic rocks, both...

The design of frequency-tunable amplifiers is investigated and the tradeoff between linearity, efficiency and tunability is revealed. Several tunable amplifiers using various varactor diode topologies as tunable devices are designed by using loadpull techniques and their performances are compared. The amplifier using anti-series distortion-free varactor stack topology achieves 38% power added e...

The paper first introduces phased array configurations for radar and astronomy applications. In radar various trends can be observed, on the one hand driven by cost issues and on the other hand by increasing performance demands. The trends discussed, are the increasing bandwidth, the improvement of the Power Added Efficiency of transmit/receive modules, the phase shifter technology, alternative...

A class E power amplifier including coupling coils is proposed for application in a wireless power transfer system using magnetic coupling. The proposed amplifier is directly connected to the coils with no discrete components for harmonic filtering and dc feeding, which could cause efficiency degradation of the amplifier. The system with the differential amplifier shows 6.95 W of transmitted po...