scholarly journals Problems of operative prediction of seismic events. The suggested way to solution

2021 ◽  
pp. 120-132
Author(s):  
В.А. Паровышный ◽  
Л.М. Богомолов ◽  
Ю.В. Сохатюк ◽  
Д.В. Паровышный
Keyword(s):  
Experimental Studies ◽  
Seismic Events ◽  
Preparation Process ◽  
Geophysical Fields ◽  
Zone Of Influence

Рассматриваются результаты экспериментальных исследований, направленных на изучение характера временных изменений естественных геофизических полей (ЕГП) над залежью газа, расположенной в зоне влияния активного регионального разлома, а также выявление связи этих изменений с сейсмичностью. В результате эксперимента установлено, что процесс подготовки сейсмических событий сопровождается резким нарушением стабильности ЕГП над продуктивными блоками залежи. The results of experimental studies aimed at studying the nature of the temporary changes in natural geophysical fields (NGF) above the gas deposit located in the zone of influence of the active regional fault, as well as revealing the connection of these changes with seismicity are found. The experiment established that the seismic events preparation process is accompanied by a sharp instability NGF above productive reservoirs of the deposit.

scholarly journals SPECIFIC FEATURES OF A PLANE SUPERSONIC FLOW

2020 ◽  
Vol 2 (7(76)) ◽  
pp. 11-17
Author(s):  
Yu.I. Cybizov
Keyword(s):  
Supersonic Flow ◽  
Experimental Studies ◽  
Physical Plane ◽  
Supersonic Speed ◽  
Input Parameters ◽  
Zone Of Influence ◽  
One To One

The purpose of this work is to study the characteristics of the flow with supersonic speed when using the tangential and radial components of convective acceleration and associated elements of the characteristic grid as parameters. Using input parameters allows to expand understanding of the zone of influence of disturbances and the nature of the forces contributing to isentropic acceleration (deceleration) of flow and one-to-one mapping between the physical plane and the hodograph of the velocity. The obtained results are proposed to be used in solving applied problems and analyzing experimental studies.

scholarly journals Improvement of the automated seismic and acoustic monitoring system “Prognoz-ADS” main elements

2020 ◽  
Vol 192 ◽  
pp. 04014
Author(s):  
Pavel Anikin ◽  
Gennady Kursakin ◽  
Iuliia Fedotova
Keyword(s):  
Rock Mass ◽  
Monitoring System ◽  
Experimental Studies ◽  
Automated System ◽  
Seismic Events ◽  
Frequency Range ◽  
Industrial Testing ◽  
Control Zone ◽  
Accuracy Measurement ◽  
Highly Sensitive

The results of theoretical and experimental studies have established the need to improve and modernize the highly sensitive piezoelectric resonant type PeA12 converters used in the seismic monitoring system, which have been successfully used for more than 30 years in the rock mass at a number of rockburst hazardous mines. The main problem of the accuracy measurement by the geophone PeA12 (and other models based on it) is due to the presence of several resonances in the operating frequency band. The developed upgraded model of the AP2088 converter has successfully passed industrial testing as part of the automated monitoring system “Prognoz-ADS” at rockburst hazardous mine. During the test period (more than 1 year), seismoacoustic events were registered and verified in the rock mass, including rock burst and shocks in the rock mass. Thus, the use of highly sensitive (u10 V/m•s-2) piezoacoustic converters AP2088 as part of the automated system provides registration of acoustic emission in the rock mass in the frequency range from 0.1 to 10 kHz with the energy of seismic events from 10 to 106 J, which will increase the reliability of the forecast of geodynamic phenomena and technogenic seismicity in the control zone of the system.

scholarly journals Variations of the parameters of internal gravity waves in the atmosphere of Central Asia before earthquakes

2019 ◽  
Vol 487 (3) ◽  
pp. 299-303
Author(s):  
V. V. Adushkin ◽  
V. I. Nifadiev ◽  
B. B. Chen ◽  
S. I. Popel ◽  
G. A. Kogai ◽  
...  
Keyword(s):  
Central Asia ◽  
Gravity Waves ◽  
Experimental Studies ◽  
Internal Gravity Waves ◽  
Seismic Events ◽  
Short Term ◽  
Wave Disturbances ◽  
Term Prediction ◽  
Before And After ◽  
Short Term Prediction

Based on the data of experimental studies of wave disturbances in the Earth’s atmosphere before and after the earthquakes in Uzbekistan (May 26, 2013) and Kyrgyzstan (January 8, 2007), earlier unknown changes in the parameters of internal gravity waves are revealed. These changes were manifested during the period of five days before the earthquake and in certain cases can be used for short-term prediction of the time when seismic events are to occur.

scholarly journals On the question of the relationship of variations in geophysical fields, lunar-solar tidal effects and seismic events

2019 ◽  
Vol 127 ◽  
pp. 02019
Author(s):  
Elena Bataleva
Keyword(s):  
Tien Shan ◽  
Seismic Events ◽  
Tidal Effects ◽  
Geophysical Fields ◽  
Instrumental Observations ◽  
Solar Tide ◽  
Time Variations ◽  
Relationship Of ◽  
The Relationship ◽  
Made In

Based on the results of instrumental observations made in the Tien Shan, the interrelation of time variations of a number of geophysical fields and seismic events is established. According to the results of the correlation analysis, it was concluded that the fault zones are characterized by significantly higher variations of geophysical fields, an intense response to weak external influences in the form of a solid moon-solar tide.

scholarly journals Microaggregate composition and other features of the loesses of Kryvyi Rih

2019 ◽  
Vol 28 (1) ◽  
pp. 133-139
Author(s):  
T. P. Mokritskaya
Keyword(s):  
Physical Properties ◽  
Fine Particles ◽  
Experimental Studies ◽  
Depth Interval ◽  
Soil Microstructure ◽  
Soil Media ◽  
Zone Of Influence ◽  
Loess Deposits ◽  
Regional Character ◽  
The City

The study of the degradation of the properties of subsiding soils under the conditions of technogenesis led to the need for searching the relationship betweenchanges in the soil physical properties, deformability, strength and its dispersity. Many researchers focus on the influence of the soil microstructure and its changes on the processes of deformation and collapse. Current models of the distribution of particles and pores in various soil media, cavities of various origin and cracks are based on the theory of fractals. Techniques for a practical application of the theory to estimating the scope of work, calculating the indicators, and engineering-geological forecasting are being developed. The previous studies showed that the theory of fractals, applied to the investigation of subsidence degradation, allowed an assessment of deformations arising from the decomposition of microaggregates in loess deposits of the city of Dnipro. A long period analysis of changes in the properties of loess deposits on the territory of the city of Kryvyi Rih showed that the changes in physical properties and conditions had a regional character. The paper presents the results of experimental studies of the microaggregate composition of loess samples taken in the depth interval of 1 - 7 m in the zone of influence of Kryvyi Rih. The microaggregate composition was determined by the new method, which we tested while studying the loess of the city of Dnipro. The total number of particle size analyses performed was 128. The results of the analyses were used to estimate the fractal dimension of the function of particle distribution by volume. The values of the function vary slightly, but the nature of the changes differs depending on the method of sample preparation for the analysis and its dispersity. Strength indexes have been determined with Physical. It has been shown that there is a correlation between the content of fine particles and the values of limiting tangential stresses Indicators of the physical condition are the repressors of tangential stress values. According to the results of the correlation analysis, the values of the soil density, the upper and lower limits of plasticity, and the content of particles with a size of 0.05-0.001 mm and less than 0.001 mm were selected as repressors.

An Improved Method for the Preparation and TEM Examination of Sharp Pointed Tips used in APFIM and STM

1990 ◽  
Vol 48 (2) ◽  
pp. 102-103
Author(s):  
E.A. Fischione ◽  
P.E. Fischione ◽  
J.J. Haugh ◽  
M.G. Burke
Keyword(s):  
Atom Probe ◽  
Preparation Process ◽  
Improved Method ◽  
Ion Milling ◽  
Polishing Process ◽  
Probe Field ◽  
Scanning Tunnelling ◽  
Stm Tips ◽  
Tunnelling Microscopy ◽  
Ion Microscopy

A common requirement for both Atom Probe Field-Ion Microscopy (APFIM) and Scanning Tunnelling Microscopy (STM) is a sharp pointed tip for use as either the specimen (APFIM) or the probe (STM). Traditionally, tips have been prepared by either chemical or electropolishing techniques. Recently, ion-milling has been successfully employed in the production of APFIM tips [1]. Conventional electropolishing techniques are applicable to a wide variety of metals, but generally require careful manual adjustments during the polishing process and may also be time-consuming. In order to reduce the time and effort involved in the preparation process, a compact, self-contained polishing unit has been developed. This system is based upon the conventional two-stage electropolishing technique in which the specimen/tip blank is first locally thinned or “necked”, and subsequently electropolished until separation occurs.[2,3] The result of this process is the production of two APFIM or STM tips. A mechanized polishing unit that provides these functions while automatically maintaining alignment has been designed and developed.

3-D reconstruction and analysis of mammalian mitotic spindle structure

1992 ◽  
Vol 50 (1) ◽  
pp. 578-579
Author(s):  
Kent McDonald ◽  
David Mastronarde ◽  
Rubai Ding ◽  
Eileen O'Toole ◽  
J. Richard McIntosh
Keyword(s):  
Cross Sections ◽  
Mitotic Spindle ◽  
Experimental Studies ◽  
Video Camera ◽  
Three Dimensions ◽  
Mitotic Spindles ◽  
Black And White ◽  
Reconstruction Methods ◽  
Spindle Structure ◽  
Tissue Culture Line

Mammalian spindles are generally large and may contain over a thousand microtubules (MTs). For this reason they are difficult to reconstruct in three dimensions and many researchers have chosen to study the smaller and simpler spindles of lower eukaryotes. Nevertheless, the mammalian spindle is used for many experimental studies and it would be useful to know its detailed structure.We have been using serial cross sections and computer reconstruction methods to analyze MT distributions in mitotic spindles of PtK cells, a mammalian tissue culture line. Images from EM negatives are digtized on a light box by a Dage MTI video camera containing a black and white Saticon tube. The signal is digitized by a Parallax 1280 graphics device in a MicroVax III computer. Microtubules are digitized at a magnification such that each is 10-12 pixels in diameter.

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