Introduction In recent years methods based on radio frequency waves have been used for detecting breast cancer. Using theses waves leads to better results in early detection of breast cancer comparing with conventional mammography which has been used during several years. Materials and Methods In this paper, a new method is introduced for detection of backscattered signals which are received by...

The propagation of seismic waves in an open borehole is reviewed. The principal wave types are the refracted P and S waves and the two guided waves pseudo-Rayleigh and Stoneley. The dispersion properties of the gUided waves are analyzed. An efficient method of computing synthetic microseismograms is described. The relative effects of the borehole. fluid and formation properties on the propagati...

It is important for interpretation of the seismic responses of a sedimentary basin to distinguish S and surface waves on strong-motion seismograms. A vertical array analysis method that decomposes S and surface waves from a set of surface and borehole seismic records (horizontal components) is proposed. Each of horizontal components of the array records assumed to consist of S wave and only one...

The reciprocal dissipation factor Q of P and S waves is determined by spectral analysis of records of earthquakes whose epicentral distance from Tsukuba ranges from 36 to 76 degrees, with special emphasis on that of short period S waves. A constant velocity radiated spectrum near the source is assumed. The value of QƒÀ(Q for S waves) is found between 300 to 2400 in the period range from 0.1 to ...

The analysis of Balmer-dominated optical spectra from non-radiative (adiabatic) SNRs has shown that the ratio of the electron to proton temperature at the blast wave is close to unity at vS .400 km s , but declines sharply down to the minimum value of me/mp dictated by the jump conditions at shock speeds exceeding 2000 km s . We propose a physical model for the heating of electrons and ions in ...

The amplitudes of P and S head waves in a full waveform acoustic log microseismogram are studied numerically as a function of borehole and formation parameters. The technique used is contour integration around the respective branch cuts in the complex wavenumber plane (Tsang and Rader. 1979). The results showed that the P wave amplitUde depends on the Poisson's ratio, but the S wave amplitude d...

s: NI2.00003 Excitation of chirping whistler waves in a laboratory plasma Session Session NI2: Waves and Instabilities 9:30 AM–12:30 PM, Wednesday, November 18, 2015 Room: Chatham Ballroom C

The mechanical properties of any substance are essential facts to understand its behaviour and make the maximum use of the particular substance. Rocks are indeed an important substance, as they are of significant use in the energy industry, specifically for fossil fuels and geothermal energy. Attenuation of seismic waves is a non-destructive technique to investigate mechanical properties of res...

Although Ca waves in cardiac myocytes are regarded as arrhythmogenic substrates, their properties in the heart in situ are poorly understood. On the hypothesis that Ca waves in the heart behave diversely and some of them influence the cardiac function, we analyzed their incidence, propagation velocity, and intercellular propagation at the subepicardial myocardium of fluo 3–loaded rat whole hear...

The construction of S-wave velocity models of marine sediments down to hundreds of meters below the seafloor is important in a number of disciplines. One of the most significant trends in marine geophysics is to use interface waves to estimate shallow shear velocities which play an important role in determining the shallow crustal structure. In marine settings, the waves trapped near the fluid–...