In the last time, several efforts were made in order to remove the polarization of membranes from P systems with active membranes; the present paper is a contribution in this respect. In order to compensate the loss of power represented by avoiding polarizations, we introduce tables of rules: each membrane has associated several sets of rules, one of which is nondeterministically chosen in each...

Polarity changes in converted-wave images constructed by elastic reverse-time migration causes destructive interference after stacking over the experiments of a seismic survey. The polarity reversal is due to the fact that S-mode polarization changes as a function of direction, and therefore the imaged reflectivity reverses sign at normal incidence. We derive a simple imaging condition for conv...

An 83-year-old male with known coronary artery disease presented to our emergency department (ED) with a complaint of palpitations and associated minor chest discomfort while on his way to play a round of golf. Vital signs were significant for a blood pressure at 122/76 mmHg, heart rate at 180 beats per minute, respiration rate at 20 breaths per minute, temperature at 37oC, and SpO2 at 98% on r...

Excitation of upper hybrid waves associated with the ionospheric heating experiments is assumed to be essential in explaining some of the features of stimulated electromagnetic emissions (SEE). A direct conversion process is proposed as an excitation mechanism of the upper hybrid waves where the energy of an obliquely propagating electromagnetic pump wave is converted into the electrostatic upp...

Absorption of electromagnetic waves in a medium is generally manipulated by controlling the frequency dispersion of constitutive parameters. However, it is still challenging to gain the desired constitutive parameters for customized absorption over a broad frequency range. Here, by virtue of spoof surface plasmonic polaritons (SPPs), we demonstrate capabilities of the spatial k-dispersion engin...

The development of the obstetric ultrasound [6] has allowed physicians and embryologists to obtain a clear picture of the developing human embryo and fetus [7] during pregnancy [8]. Obstetric ultrasonography, often referred to as ultrasound [6], is a technology that uses sound waves to produce images of structures inside the human body. A handheld probe emits sound waves, which are reflected ba...

A study of microwave-induced thermoacoustic tomography of inhomogeneous tissues using multi-sector scanning is presented. A short-pulsed microwave beam is used to irradiate the tissue samples. The microwave absorption excites time-resolved acoustic waves by thermoelastic expansion. The amplitudes of the acoustic waves are strongly related to locally absorbed microwave-energy density. The acoust...

The analysis of crosswell seismic data for a gas reservoir in Texas revealed two newly detected seismic wave effects, recorded 2000 feet above the reservoir. The first is that the dominant late phases on the records are the tube waves generated in the source well and later converted into laterally propagating waves through the reservoir in gas/water saturated layers, which convert back to tubew...

The development of the obstetric ultrasound [6] has allowed physicians and embryologists to obtain a clear picture of the developing human embryo and fetus [7] during pregnancy [8]. Obstetric ultrasonography, often referred to as ultrasound [6], is a technology that uses sound waves to produce images of structures inside the human body. A handheld probe emits sound waves, which are reflected ba...