spectral analysis

Research of Existing Methods for Determining Spatial and Frequency Parameters of Electronic Warfare (EW) Sources

Modern approaches to determining the spatial and frequency parameters of electronic warfare (EW) sources, which are crucial for ensuring the efficiency of electronic intelligence, defense, and countermeasures systems, have been studied. A classification of existing methods, covering spatial, frequency, and combined approaches, has been conducted. The features of using antenna systems, phase methods, triangulation, and correlation analysis to determine the spatial characteristics of sources have been considered.

DEVELOPMENT OF AN INTELLIGENT MONITORING SYSTEM FOR WATER RESOURCES

The article presents the development of a spectroscopic water resource monitoring system utilizing modern optical sensors and microcontrollers for real-time automated water quality assessment. The primary objective is to create an intelligent system for water condition evaluation, enabling the detection of organic and inorganic contaminants through spectral analysis. The system is equipped with the AS7265x spectroscopic sensor, operating in the visible and near-infrared ranges, allowing for high-precision spectral analysis.

Mathematical modeling and statistical analysis of Moroccan mean annual rainfall using EXPAR processes

In this work, we propose a study of the mean annual rainfall time series in order to evaluate the climate changes pattern over time.  If the analysis of this time series is carried out correctly, it can contribute to improve planning and policy development.  That is why we consider the problem of mathematical modeling and analysis of the mean annual rainfall of Morocco between 1901 and 2020 using descriptive statistics, structure changes analysis, spectral analysis and a nonlinear Exponential Autoregressive (EXPAR) processes to reproduce the behavior of this time series

Application of wear-resistant coating by electrospark alloying method using an eutectic electrode material

Analysis of the literature database connected with the usage of an electro-spark alloying (ESA) for tool hardening has been carried out in the article.

Necessity of developing a new tungstenless electrode materials with eutectic structure for improvement of an electro-spark alloying technologies has been proved. Therefore, the structure of a new eutectic Fe-Mn-C-B-Si-Cr-Li alloy system has been developed and manufacturing techniques of an alloying by a sintering method has been offered.

The Earthquake in Kryvyi Rih 14-01-2011 as a local result of seismotectonic and man-caused processes

In the paper the results of the conducted analysis of records of the registered seismic event which was take place 2011.01.14 in Kryvyi Rig and arguments in favour of determine this event as earthquake are presented.

The long-term time-series prediction of the debris flow activity in Carpathian mountains' hydrogeologic region territory

Analysis of the debris flow formation factors which cause the long-term activity of debris flows is made. The methodology of the debris flows prediction subject to meteorological, hydrological, seismic, heliophysical factors is proposed. The regularities of long-term seasonality of these factors by using autocorrelation and spectral analysis are revealed. The integral rate of probability of debris flow intensification is calculated. The time series of this integral rate is extrapolated and the following peak of debris flows activation is predicted.

Calculation of the dynamic response of reinforced concrete structures subjected to the ffects of heavy transport

A 3D model of a reinforced concrete building was created using a dynamic analysis which focused on the spectral response of the object represented by a random excitation experiment found in records in the form of load spectra.