The current control methods play an important role in power electronic circuits, particulary in current regulated PWM inverters which are widely applied in ac motor drives and continuous ac power supplies where the objective is to produce a sinusoidal ac output. The main task of the control systems in current regulated inverters is to force the current vector in the three phase load according t...

The emergence of Bluetooth as a defacto radio interface has allowed handheld electronic devices to be instantly interconnected as ad hoc networks. Recent studies show that since Bluetooth operates in the unlicensed 2.45 GHz frequency band, the presence of multiple piconets in the vicinity creates intermittent interference on signal reception which, in turn, degrades the overall throughput of th...

Recent advances in optical communications have increased the bandwidth of individual wavelengths and the number of wavelengths carried per fiber by a substantial amount. The increase in traffic demands has however failed to keep pace with this phenomenon resulting in a number of sub-wavelength demands. These sub-wavelength demands need to be allocated one wavelength resulting in wastage of resi...

<span lang="EN-US">An octa-band frequency-reconfigurable antenna (28×14×1.5 mm<sup>3</sup>) with a broad tuning range is shown. Antenna mode1 (4.31 GHz) works in one single-band mode and two dual-band modes 2 3 (i.e., 3.91 5.9 as well tri-band 4 3.09, 5.65, 7.92 based on the switching situation of antenna. Changing capacitance for frequency reconfigurability accomplished use l...

Correction factors are presented for estimating the RF electromagnetic field strength in the compliance assessment of human exposure from an indoor RF radio source in the frequency range from 800 MHz to 3.5 GHz. The correction factors are derived from the increase in the spatial average electric field strength distribution, which is dependent on the building materials. The spatial average elect...

pyridostigmine bromide (pb) is a reversible cholinesterase inhibitor. the aim of this study was to determine the effect of orally administration of single dose sustained-released tablet of pyridostigmine bromide (pbsr) on the frequency domain indices of heart rate variability (hrv). thirty-two healthy young men were participated in this study. they were divided into 2 groups; the pyridostigmine...

Multi-band transmission technologies promise to cost-effectively expand the capacity of optical networks by exploiting low-loss spectrum windows beyond conventional band used in already-deployed fibers. While such offer a high potential for upgrades, available is seriously restricted not only wavelength-continuity constraint but also signal-to-noise ratio (SNR) constraint. In fact, more bands c...

In this paper, adaptive hysteresis band current controller is implemented to control the injected into grid. Initially it was by B.K Bose for of machine drive. Now grid connected PV inverter, Grid. It well suitable distribution generation. The changes bandwidth based on modulating frequency, supply voltage, input DC voltage and slope reference current. Consequently, generates pulses inverter. a...

This paper presents a novel control method to improve the efficiency of low-voltage DC-DC converters at light loads. Pulse Width Modulation (PWM) converters have poor efficiencies at light loads, while pulse frequency modulation (PFM) control is more efficient for the same cases. Switching losses constitute a major portion of the total power loss at light loads. To decrease the switching losses...