The shock-acoustic waves generated by earthquakes

We investigate the form and dynamics of shock-acoustic waves generated by earthquakes. We use the method for detecting and locating the sources of ionospheric impulsive disturbances, based on using data from a global network of receivers of the GPS navigation system and requiring no a priori information about the place and time of associated effects. The practical implementation of the method is illustrated by a case study of earthquake effects in Turkey (August 17, and November 12, 1999), in Southern Sumatera (June 4, 2000), and off the coast of Central America (January 13, 2001). It was found that in all instances the time period of the ionospheric response is 180-390 s, and the amplitude exceeds by a factor of two as a minimum the standard deviation of background fluctuations in total electron content in this range of periods under quiet and moderate geomagnetic conditions. The elevation of the wave vector varies through a range of 20-44 degree, and the phase velocity (1100-1300 m/s) approaches the sound velocity at the heights of the ionospheric F-region maximum. The calculated (by neglecting refraction corrections) location of the source roughly corresponds to the earthquake epicenter. Our data are consistent with the present views that shock-acoustic waves are caused by a piston-like movement of the Earth surface in the zone of an earthquake epicenter.Comment: EmTeX-386, 30 pages, 4 figures, 3 tabl

COMPARATIVE ANALYSIS OF TOOLS FOR ESTIMATION OF INVESTMENT CLIMATE OF TERRITORIES

Purpose: The present paper is a study of the most well-known foreign and domestic methods for assessing the investment climate of the regions as well as identifying their main disadvantages. Methodology: The study of regional investment issues should be based on a systematic approach taking into account the positive and negative aspects of each methodology separately. Result: Opportunities to improve the competitiveness of the constituent entities of the Russian Federation are considered, too. The existing methods applied by various research-rating agencies are considered in detail. Applications: This research can be used for the universities, teachers and education students. Novelty/Originality: In this research, the model of comparative analysis of tools for estimation of the investment climate of territories is presented in a comprehensive and complete manner

Implementation of control algorithms for frequency-controlled electric drive with open-loop scalar system based on signal processor TMS320F28335

Рассматривается начальный этап освоения программирования сигнальных процессоров TMS320F28335, а именно реализация разомкнутой скалярной системы управления асинхронным электроприводом на основе сигнального процессора TMS320F28335. В работе приведено краткое описание системы управления и особенности ее работы, а также приведены осциллограммы настройки ШИМ-сигналов с выходов платы.The initial stage of alarm processors TMS320F28335 programming development, namely realization of electric drive opened scalar control system on the basis of the alarm processor TMS320F28335 is considered. The short description of a control system and feature of her work is provided, and also oscillograph trace of PWM-signals control from processor exits are provided

State Procedures for Improving the Investment Climate in the Russian Federation: Prospects for Improvement

The COVID-19 pandemic interrupted many trends that had developed before it and again updated the issue of modernizing the Russian economy, restarting the mechanisms of economic growth and sustainable socio-economic development. The key to resolving these issues is to increase the investment activity of the business. The investment climate is one of the key characteristics that testify to the freedom of entrepreneurial activity, the ease of opening and conducting business, the quality of regulatory procedures in the economy, the effectiveness of business entities, and the provision of equal opportunities for the development of the private sector. A favorable investment climate reveals the potential for the development of private companies. The article considers the system of state procedures in the field of improving the national investment climate, gives a brief description of the main tools and projects to improve the investment climate, analyses the changes in the main target indicators of investment attractiveness of the Russian Federation

Resource-effective solutions to address hypomagnetic influence on human body

Relevance: Hypomagnetic conditions have undesirable effects concerning various fields of science and technology. In biology, they cause adverse circumstances, which affect the functioning of living organisms. However, humans experience hypomagnetic fields (HMF) during space exploration, through some branches of production, military objects, and community transport. On the other hand, various high-precision technologies must have or operate under a hypomagnetic field. Aims: We aimed to provide a critical analysis of several ways of preparing hypomagnetic field, differences between hypomagnetic chambers and Helmholtz coils, and review of thematic patents and articles available in the Russian Federation. Methods: We structured and analyzed modern achievements in HMF. Experimental studies on living organisms were evaluated because they show different technical conditions connected to the theme of the hypomagnetic field. Results: Based on this analysis, a new resource-effective technology, which reveals several concerns on the hypomagnetic field, was offered. This technology is essential to be used during preparations for space missions, which require products with special necessities in terms of effectiveness and reliability. Conclusion: We summarized and correlated the results of experiments with possible magnetic conditions, which can occur during space missions and in some military and civil applications. Protection strategies from hypomagnetic conditions were considered. Novel experiments regarding realistic conditions were suggested

Digital economy: Data analysis on the context advertising market in the UK and the US

© IAEME Publication. Users behave differently when searching for the same queries, and this is manifested in the cost of online promotion by keywords. The data collected from the English-speaking search engine Google (two countries: the US and the UK) for the general request "html" have been analyzed and compared in the study. Dispersion and regression analyses have been used as methods. Cost-per-click, the amount of observed data with filled values by parameters N=6,917, is a dependent variable. As a result of the study, it has been found that the predictive model of the US contextual advertising market is more important in comparison with the UK, which indicates better development of the US market. Despite the developed US market, advertisers prefer not to search for a keyword with multiple words as an ad trigger in the Google search engine