A method to analyse HRV (heart rate variability) using an ECG monitoring system is presented. Variations in heart rate may be evaluated by a number of methods. The current methodologies used to analyse HRV are based largely on linear techniques to analyse ‘past’ and ‘present’ electrocardiogram (ECG) data in time and frequency domains. For conventional time domain analysis, the variability in the R-R interval time series derived from an ECG recording is statistically summarised using conveniently calculated measures such as SDNN (standard deviation of time interval between consecutive R peaks) and RMSSD (root-mean square of the difference between two adjacent R-R intervals). Depending on the length of the analysed ECG recording, which may vary from a few minutes to 24 hours, and the choice of the time domain measure, both short-term and long-term HRV can be quantified and characterised.

Many metallic glasses are well known as soft magnetic materials, because of their amorphous structure which presumes the absence of magneto-crystalline anisotropy. It has been shown that amorphous materials are not fully isotropic, but rather have small induced anisotropies because of the cooling strains. The ferromagnetic resonance is an important tool for characterizing the magnetic materials because of the small penetration depth of the microwave radiation used in such experiments. The aim of this paper is to present a new method for magnetic properties study by FMR for as-cast CoFe-based glass covered amorphous wires, employing a vector network analyzer and microwave guide transmission line. The method can be also employed and for other magnetic sample like as thin layers and nanowire arrays.

Seismic stations planned for monitoring of nuclear explosions banned under the Comprehensive Nuclear-Test-Ban Treaty (CTBT) should meet certain special technical requirements, established for the International Monitoring System (IMS) of the Preparatory Commission of the CTBT Organization. For verification of compliance with such stringent requirements extensive testing of the equipment instrumental noise is required. This paper presents the testing and results of seismometers and digitizers used or planned to be used in the IMS network.

The voice quality in Internet Protocol (IP) telephony is significantly influenced by various factors, including delay, delay variation, bandwidth congestion and the distribution of packet loss. Hence, the performance of IP telephony systems is highly dependent on understanding the contribution of these factors to the voice quality. This paper deals about a method for classifying Voice over IP (VoIP) network impairments analyzing the signal power during a phone call. In particular, three main impairments have been considered: packet loss, jitter and bandwidth congestion. From the voice signal some figures of merit have been extracted and used to identify the impairments affecting the communication.

The influence of a liquid suspension of iron nanoparticles on the magneto-impedance (MI) of an array of glass-coated amorphous microwires array was studied. The array sensitivity increases as the number of the active microwires increases. The highest variation of 59% was found for 10 microwires, measured with and without magnetic nanoparticles, when using a current intensity of 10 mA.