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A MIMO structure consisting of two extremely compact planar inverted-F antennas (PIFAs) (lambda/60×lambda/20×lambda/60) is proposed for GSM 900 MHz and 2.4 GHz wireless local area network applications. The miniaturisation of each antenna is achieved through a spiral-shaped PIFA and a capacitive load, forming a LC resonator. Both antennas have a good impedance bandwidth of 0.88–0.945 and 2.39–2.48
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Distribution Tax of mergers of limited liability companies
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
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
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
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
