The least-mean-square (LMS) adaptive filter is applied to suppress narrow-band radiofrequency interference (R.FI) in wideband synthetic aperture radar (SAR.) signals. Simulation is used to show the working principles of the adaptive filter and to obtain the optimum filter's parameters. The algorithm is tested with P-band synthetic aperture radar (SAR.) data collected by the NASA/JPL airborne SA...

reply to the letter sent by prof. viroj wiwanitkit entitled “radiofrequency radiation and human ferritin”   authors of the article entitled “effects of radiofrequency radiation on human ferritin: an in-vitro enzymun assay” [1] would like to express their satisfactions, since the manuscript have been accessed and used as an element of reflection by a renowned researchers such as prof. wiwanitkit...

The human species is now able to communicate with other civilizations in space, if such exist. Using current radioastronomical technology, it is possible for us to receive signals from civilizations no more advanced than we are over a distance of at least many thousands of light years. The cost of a systematic international research effort, using existing radio telescopes, is as low as a few mi...

Low frequency analog and digital electronic circuits are susceptible to radiofrequency interference (RFI). This disturbance is produced when the coupled RF signal is rectified by the nonlinear behavior of the semiconductors used in the small signal analog input stages of the electronic system. These circuits present an AM demodulation effect produced by nonlinearity of internal transistors, gen...

Phase-locked-loop in radiofrequency and mixed signal integrated circuit experience noise as electromagnetic interference coupled on input and power supply which translates to the timing jitter. Most of PLL noise analysis did not take into account the ageing effect. However device ageing can degrade the physical parameters of transistors and makes noise impact worse. This paper deals with the an...

patients with valvular heart disease and suffering atrial fibrillation of more than 12 months duration have a low probability of remaining in sinus rhythm after valve surgery alone. we performed intra-operative radiofrequency ablation or cryoablation as an alternative to surgical maze ііі procedure to create linear lesion lines for conversion of this arrhythmia to sinus rhythm. a total of 30 pa...

This letter proposes a compact and energy-efficient directional modulation scheme for small power constrained devices (e.g., Internet of Things wireless sensors). The uses uniform circular array monopole antennas, with single radiofrequency chain antenna active at time. antennas can be located in close proximity, offering significant size reduction. Furthermore, the was demonstrated to operate ...

Radio astronomy is a passive service and is equipped to observe extremely weak signals from outer space. The sensitivity of current state-of-the-art telescopes is over ten orders of magnitude higher than in most communications systems. Although radio telescopes are best located in relatively remote areas, astronomical observations may be still hampered by man-made radio frequency interference (...

The Square Kilometre Array (SKA) will be a formidable instrument for the detailed study of neutral hydrogen (H I) in external galaxies and in our own Galaxy and Local Group. The sensitivity of the SKA, its wide receiver bands, and the relative freedom from radio frequency interference at the SKA sites will allow the imaging of substantial number of high-redshift galaxies in H I for the first ti...

Through experiments and numerical simulations we explore the behavior of rf SQUID (radio frequency superconducting quantum interference device) metamaterials, which show extreme tunability and nonlinearity. The emergent electromagnetic properties of this metamaterial are sensitive to the degree of coherent response of the driven interacting SQUIDs. Coherence suffers in the presence of disorder,...