Multi-antenna receivers are a key technology for modern communication systems. Signal attenuation in the very low frequency (VLF) channel is serious problem. In addition to high signal attenuation, resulting noise on VLF non-Gaussian. Hence, analyze and address issue of normal operation multi-antenna receiver channel, we must study detection problem multi-dimensional non-Gaussian fading channel...

The multiple signal classification (MUSIC) method and the wave distribution function (WDF) method are applied to the artificial VLF wave propagation from Khabarovsk through the magnetospheric duct to the conjugate point Ceduna (L = 1.8). The estimated arriving direction and the wave energy indicates that the location of the termination of the magnetospheric duct fluctuates related to the geomag...

Background: Orthostatic hypotension in diabetes patients is a sign of autonomic dysfunction. Heart rate variability (HRV) analysis is one of the methods for cardiac autonomic neuropathy assessment. The aim of this study was to assess blood pressure and HRV during 5 minute upright tilting in patients with type 1 diabetes. Methods: We studied 48 normotensive diabetes patients aged 18–28 years, wi...

In subjects with sinus rhythm, respiration has a profound effect on heart rate variability (HRV) at high frequencies (HF). Because this HF respiratory arrhythmia is lost in atrial fibrillation (AF), it has been assumed that respiration does not influence the ventricular response. However, previous investigations have not considered the possibility that respiration might influence HRV at lower f...

The purpose of this study was to develop a mathematical model the photoplethysmogram, which can be used test methods that introduce instantaneous phases modulating signals. must reproduce statistical and spectral characteristics real explicitly incorporate signals, so they as reference during testing. Methods. Anacrotic catacrotic photoplethysmogram pulse wave were modeled sum two density distr...

Mounting evidence of chemical disequilibria in the Venusian atmosphere has heightened interest search for life within planet’s cloud decks. Balloon systems are currently considered to be superior class aerial platform extended atmospheric sampling clouds, providing highest ratio science return risk. Balloon-based designs depend heavily on payload mass and target altitudes. We present options co...