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Damping of Electro-Mechanical Oscillations in a Multimachine System by Direct Load Control

Utility controlled customer loads as actuators present new possibilities for power system control. The use of active loads controlled by local bus frequency is proposed for damping of electro-mechanical oscillations. The viability of the idea is studied for one load in a three machine system with a meshed network. Active power mode controllability and phase angle mode observability are determined

Kirurgi snart även primärprevention vid slaganfall av höggradig karotisstenos

Indications for and the results of carotid endarterectomy in symptomatic and asymptomatic carotid artery stenosis are reviewed. The main indication for carotid endarterectomy is symptomatic stenosis of a carotid artery with >70 percent lumen reduction according to the NASCET method, or >85 percent lumen reduction according to the ECST method. The operation should ideally be performed within two we

Frequency estimation from crossings of an unknown level

By counting the number of upcrossings of the mean level by a stationary Gaussian process one can estimate the mean frequency of the process. Here we present a frequency estimator based on the number of upcrossings of one unknown level hoped to be near the mean, and the percentage of the total observation time spent above the level. This is equivalent to observing upcrossings of a known level in a

Optical theorem and forward scattering sum rule for periodic structures

Abstract in Undetermined Based on energy conservation, an optical theorem is constructed for a slab having an arbitrary periodic microstructure in a plane. A sum rule for low pass structures is derived using analytic properties of Herglotz functions based on causality and passivity. The sum rule relates the total cross section to the static polarizability per unit cell, and quantifies the interactBased on energy conservation, an optical theorem is constructed for a slab having an arbitrary periodic microstructure in a plane. A sum rule for low pass structures is derived using analytic properties of Herglotz functions based on causality and passivity. The sum rule relates the total cross section to the static polarizability per unit cell, and quantifies the interaction between the slab and

Incidence of malignancy in patients treated for antineutrophil cytoplasm antibody-associated vasculitis: follow-up data from European Vasculitis Study Group clinical trials.

OBJECTIVES: /st> Because standard immunosuppressive treatment for antineutrophil cytoplasm antibody-associated vasculitis (AAV) (granulomatosis with polyangiitis (Wegener's) (GPA) and microscopic polyangiitis (MPA)) has been associated with a significant risk of developing cancer, the cancer incidence of treated AAV patients was assessed. METHODS: /st> This analysis concerned 535 patients with new

Co-channel interference mitigation in GSM networks by iterative estimation of channel and data

In multiple-access communication systems several users share the system resources, thus creating co-channel interference to each other. Multiuser detection, applied at the receiver side, is a powerful technique to combat co-channel interference, in contrast to single-user approaches that treat the interference as additive noise. In this paper, we investigate the feasibility of achieving increased