[1] The ratio of monthly median foF2 values between the ionosondes at Maui (20.8 N, 156 E geographic; 21.2 N, 90.4 E geomagnetic) and Yamagawa (31.2 N, 130.6 E geographic; 20.6 N, 160.9 E geomagnetic) from January 1960 to June 1993 are used to investigate interannual variability in the wave-4 longitudinal structure of the low-latitude F region ionosphere. Analysis of Global Positioning System t...

Modern echocardiographic techniques, i.e. tissue Doppler imaging and speckle tracking echocardiography, allow for an assessment of global and regional right ventricular function. The right ventricular myocardial performance index and tricuspid annulus motion are used in the assessment of global right ventricular function, whereas duration of the cardiac cycle phases and myocardial velocities ar...

We present a dynamically tunable mechanism of wave transmission in 1D helicoidal phononic crystals in a shape similar to DNA structures. These helicoidal architectures allow slanted nonlinear contact among cylindrical constituents, and the relative torsional movements can dynamically tune the contact stiffness between neighboring cylinders. This results in cross-talking between in-plane torsion...

In the present work, a four-port model for inter-digital transducer was developed. This model was modified from Mason’s equivalent circuit and was ideal for the simulation of balanced mode surface acoustic wave devices. Inheriting the virtues of Mason’s model, this model included the energy storage effect and was capable to fit arbitrary polarity configuration of transducers. Simulation results...