Development of a domestic methodology for assessing the risks of acid effluent formation during storage and use of wastes from coal mining and processing

2021 ◽  
pp. 107-112
Author(s):  
T. O. Gushchina ◽  
E. E. Sokolovskaya ◽  
Hao Jie ◽  
S. A. Epshtein
Keyword(s):  
Classical Method ◽  
Basic Research ◽  
Preliminary Assessment ◽  
Neutralization Potential ◽  
Static Test ◽  
Water Formation ◽  
The Russian Federation ◽  
Basic Research Grant ◽  
Acidic Wastewater ◽  
Research Grant

It is shown that the main ecologically significant characteristics of wastes from mining and processing of coal, which are considered when assessing their impact on the environment, are the indicators reflecting the risks of acidic water formation and leaching of macro- and microelements from rocks. A review of the methods used abroad to determine the risks of formation of acidic effluents during storage or use of wastes is carried out. It is shown that at present in the Russian Federation there is no regulatory support for assessing this indicator in wastes from mining, processing and combustion of coals. It is noted that for a preliminary assessment of the risks of acidic wastewater drainage, the most common method for determining the neutralization potential of waste is the so-called A. Sobek static test (ABA). The main stages of the development of the domestic method for determining the potential of neutralization in waste are presented and its approbation is carried out on existing research objects. The developed methodology takes into account the main provisions of the classical method for determining the neutralization potential of A. Sobek and makes additions to the procedure for testing of the samples, which makes it possible to increase the accuracy of the obtained results and extend the domestic methodology not only to wastes from mining and benefication of coals, but also to wastes from combustion and processing of coal, such as fly ash, slag and ash and slag wastes. The study was supported by the Russian Foundation for Basic Research, Grant No. 19-35-90117.

scholarly journals Application of parabolic spline for population income distributions analysis

2019 ◽  
pp. 24-31
Author(s):  
Valery Lebedev ◽  
Konstantin Lebedev ◽  
Tatyana Tyupikova
Keyword(s):  
Statistical Data ◽  
Empirical Test ◽  
Basic Research ◽  
Adequate Model ◽  
Main Research ◽  
Income Distributions ◽  
Parabolic Spline ◽  
The Russian Federation ◽  
Basic Research Grant ◽  
Research Grant

The aim of the study is an empirical test of the hypothesis about the possibility of using the lognormal function as an adequate model of the distribution of the population by income. The method of spline functions is used as the main research tool. The values of the free parameters of the parabolic spline were determined from the solution of the problem of minimizing the integral smoothness of the distribution function under the condition of its monotonic increase. As the information base of the study, statistical data on the distribution of wages of employees of organizations of the Russian Federation in 2019 were used. This work was supported by the Russian Foundation for Basic Research, grant No. 19-010-000921.

Secular geomagnetic field variations in Bulgarian lands during Classical Age and Late Antiquity – new archaeomagnetic data

2021 ◽  
Author(s):  
Maria Kostadinova-Avramova ◽  
Petar Dimitrov ◽  
Andrei Kosterov ◽  
Mary Kovacheva
Keyword(s):  
Material Culture ◽  
Late Antiquity ◽  
Basic Research ◽  
Reference Points ◽  
Archaeological Sites ◽  
Historical Sources ◽  
National Science ◽  
Basic Research Grant ◽  
National Science Fund ◽  
Research Grant

<p>Numerous historical sources and archaeological monuments attest the age of Antiquity in Bulgaria – from both the early Roman period (I – III c.) and Late Antiquity (IV – VI c.). Owing to systematic archaeological excavations, lasting more than 100 years, plenty of information has been accumulated concerning not only all aspects and manifestations of its material culture, but also their evolution and chronology.  This in turn allows for interdisciplinary fields such as archaeomagnetism to progress.</p><p>There are many archaeomagnetically studied archaeological structures from the Antiquity. The results included in the Bulgarian database form 74 reference points. However, only 20 of them are full-vector determinations because 70 % of the investigated materials are bricks. Hence, the secular variation of declination is poorly constrained within the considered period. Moreover, the reuse of bricks in the constructions occurred quite often (especially in the Late Antiquity) providing for possible errors in archaeological dating. In addition, stronger effects of magnetic anisotropy and cooling rate are usually expected for bricks than for hearths, domestic ovens, production kilns or burnt dwelling remains (there are no results from pottery in the Bulgarian dataset) and both factors are not evaluated for most of the older results. All this can explain the contradictions observed between some of the experimental results juxtaposed over the absolute time scale. In an attempt to clarify these contradictions 13 baked clay structures from eight archaeological sites were archaeomagnetically studied producing seven new directional and eight new intensity data. The samples collected possess variable magnetic properties suggesting differences in clay sources and/or firing conditions. Magnetically soft minerals prevail in seven structures but in the remaining six, abundant HCSLT phase is detected. The success rate of archaeointensity determination experiments vary from 49 to 100 %. It appears that samples containing HCSLT phase always produces good araeointensity results unlike those with the dominant presence of soft carriers.</p><p>The new reference points are compared with the present compilation of Bulgarian archaeomagnetic dataset and with the data from the neighboring countries.</p><p> </p><p>This study is supported by the grant KP-06-Russia-10 from the Bulgarian National Science Fund and Russian Foundation of the Basic Research grant 19-55-18006.</p>

On the number of sum-free sets in a segment of positive integers

2002 ◽  
Vol 12 (4) ◽  
Author(s):  
K. G. Omelyanov ◽  
A. A. Sapozhenko
Keyword(s):  
Basic Research ◽  
Basic Research Grant ◽  
Positive Integers ◽  
Free Sets ◽  
Research Grant

AbstractA set A of integers is called sum-free if a + b ∉ A for any a, b ∈ A. For an arbitrary Ɛ > 0, let ssThis research was supported by the Russian Foundation for Basic Research, grant 01-01-00266.

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