in this study, absorption of high frequency radio waves in the ionospheric plasma have beeninvestigated. the wave equation was obtained in terms of ionospheric parameters. the numerical values ofthe absorption have been calculated for 4 mhz, 4.5 mhz and 5 mhz waves. the necessary parameters forcalculation have been obtained using an international reference ionosphere (iri) model. the altitudina...

Higher measures of arterial stiffness are associated with increased risk of atherosclerotic cardiovascular disease and mortality. However, the contribution of higher arterial stiffness toward risk of heart failure (HF) and its subtypes, HF with preserved ejection fraction and HF with reduced ejection fraction, independent of other established risk factors, is not well studied. In this study, we...

Higher measures of arterial stiffness are associated with increased risk of atherosclerotic cardiovascular disease and mortality. However, the contribution of higher arterial stiffness toward risk of heart failure (HF) and its subtypes, HF with preserved ejection fraction and HF with reduced ejection fraction, independent of other established risk factors, is not well studied. In this study, we...

Higher measures of arterial stiffness are associated with increased risk of atherosclerotic cardiovascular disease and mortality. However, the contribution of higher arterial stiffness toward risk of heart failure (HF) and its subtypes, HF with preserved ejection fraction and HF with reduced ejection fraction, independent of other established risk factors, is not well studied. In this study, we...

Higher measures of arterial stiffness are associated with increased risk of atherosclerotic cardiovascular disease and mortality. However, the contribution of higher arterial stiffness toward risk of heart failure (HF) and its subtypes, HF with preserved ejection fraction and HF with reduced ejection fraction, independent of other established risk factors, is not well studied. In this study, we...

[1] Dual-beam ELF wave generation experiments performed at the High-frequency Active Auroral Research Program (HAARP) HF transmitter are used to investigate the dependence of the generated ELF wave magnitude on HF power, HF frequency, modulation waveform, and receiver location. During the experiments, two HF beams transmit simultaneously: one amplitude modulated (AM) HF beam modulates the condu...

In 1962, Overhauser showed that within Hartree-Fock (HF) the electron gas is unstable to a spin-density wave state. Determining the true HF ground state has remained a challenge. Using numerical calculations for finite systems and analytic techniques, we study the unrestricted HF ground state of the three-dimensional electron gas. At high density, we find broken spin symmetry states with a near...

We investigated human hippocampal functional connectivity in wakefulness and throughout non-rapid eye movement sleep. Young healthy subjects underwent simultaneous EEG and functional magnetic resonance imaging (fMRI) measurements at 1.5 T under resting conditions in the descent to deep sleep. Continuous 5 min epochs representing a unique sleep stage (i.e., wakefulness, sleep stages 1 and 2, or ...

ince 1992, the Strategic Systems Department of the Applied Physics Laboratory has been investigating the use of high-frequency (HF) ground wave transmissions in the upper HF band for sea-based communications. This effort has examined the optimization of shipboard antennas for two-way communications with ground stations. This article describes early tests using differential Global Positioning Sy...

[1] We present calibrated measurements of ELF waves generated by modulated HF heating of the auroral electrojet by the High frequency Active Auroral Research Program (HAARP) HF transmitter in Gakona, Alaska, and detected after propagating more than 4400 km in the Earth-ionosphere waveguide to Midway Atoll. The magnitude of the 2125 Hz wave received at Midway Atoll is consistent with the radiati...