The U wave, when first recognized by Einthoven (1906) in the earliest days of electrocardiography, was considered by him to be pathological. Since then the normality of upright U waves, except perhaps in cases where they are unusually high (Katz, 1946), has been generally conceded. Various hypotheses have been advanced to explain the U wave, of which the most satisfactory is that of Hoff and Na...

the existing theory for wave propagation through a soil layer are not compatible with the real soil layers because in the theory the layers are flat and the sub-layers are parallel, while in real the soil layers are not flat and they may not be parallel. thus, wave propagations through a corrugated interface are so important. in this paper, a two-dimensional sh-wave propagation through a corrug...

This work deals with the determination of the shape of a generally non-circular impenetrable cylinder from the way it scatters incident sound. A complete family (of generally non-orthogonal functions) representation of the scattered field is employed to match the total measured field. The data equation and state equation, derived from the Rayleigh hypothesis, are grouped into a single nonlinear...

We derive displacement equations for Rayleigh and Love waves in simple structural models for point sources in order to better understand source effects on their wavefields and radiation patterns. In doing so, we analytically demonstrate the existence of surface waves in these Earth models. Rayleigh and Love wave radiation patterns are found to mimic the P and SH radiation patterns, respectively...

OBJECTIVES To investigate the relationship between early T-wave inversion after thrombolytic therapy and the likelihood of successful epicardial coronary reperfusion. SUBJECTS AND METHODS Thrombolytic therapy was given to 195 patients with ST segment elevation due to acute anterior myocardial infarction (AMI). Coronary angiography was performed. Receiver operating characteristic (ROC) curve (...

The interplay of the librations of a covalently bound organic adlayer with the lattice waves of an underlying semiconductor surface was characterized using helium atom scattering in conjunction with analysis by density functional perturbation theory. The Rayleigh wave dispersion relation of CH3- and CD3-terminated Si(111) surfaces was probed across the entire surface Brillouin zone by the use o...