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  1. Article ; Online: Experimental Studies of the Developed Method for Determining the Insulation Parameters in an Asymmetric Network by a Voltage up to 1000 V at Mining Enterprises

    Utegulov A. B. / Koshkin I. V. / Koshkina A. I.

    E3S Web of Conferences, Vol 220, p

    2020  Volume 01032

    Abstract: In the work experimental studies of the developed method for determining the insulation parameters in an asymmetric electrical network by a voltage up to 1000 V at mining enterprises were carried out. It is based on measuring the module values of line ... ...

    Abstract In the work experimental studies of the developed method for determining the insulation parameters in an asymmetric electrical network by a voltage up to 1000 V at mining enterprises were carried out. It is based on measuring the module values of line voltage, angle of phase shift between vectors of damaged phase voltage relative to the ground and line voltage at two other phases, as well on measuring the module value of damaged phase voltage relative to the ground before and after connecting additional capacitive conductivity between the network’s phases and the ground. The results of experiment showed that the developed method for determining the insulation parameters has satisfactory accuracy and safety when operating three-phase electrical networks by voltage up to 1000 V at mining enterprises.
    Keywords Environmental sciences ; GE1-350
    Language English
    Publishing date 2020-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Features of Fodder Vegetation as a Possible Cause of Saiga Die-Offs on Steppe Pastures

    Abaturov, B. D. / Gorbunov, S. S. / Koshkina, A. I.

    Arid ecosystems. 2021 Oct., v. 11, no. 4

    2021  

    Abstract: Modern climatic changes, weakening of the anthropogenic pasture load, and an increase in steppe fires have led to the expansion and dominance of grasses (graminoids) vegetation on the steppe pastures of Russia and Kazakhstan since the end of the 20th ... ...

    Abstract Modern climatic changes, weakening of the anthropogenic pasture load, and an increase in steppe fires have led to the expansion and dominance of grasses (graminoids) vegetation on the steppe pastures of Russia and Kazakhstan since the end of the 20th century. This resulted in deterioration of the forage quality of pasture vegetation, a factor in the depression of the saiga population that may have affected the increase in cases of saiga die-offs. A die-off occurred in Kazakhstan in 2015, when about 200 000 animals died. A large number of different versions have been put forward about the reasons for these deaths: an infectious disease (hemorrhagic septicemia), toxic forage plants, unfavorable weather conditions, and the destructive effect of rocket fuel. In this article, we consider a different version of death associated with the negative effect of low-quality food on the sites of saiga death. It is shown that the food supply for saigas on steppe pastures consistently decreases with an increase in the abundance of grasses in forage vegetation. Suitable, nutritious food for breeding saigas include pastures in which the share of grasses in the aboveground phytomass is no more than 30%. If this level is exceeded, the pastures do not provide the necessary level of nutrition for breeding saigas and are unsuitable for them. It is possible that the saigas found themselves during spring migration in steppe regions with a predominance of turf grasses (65–75%), which exceeds their permissible (threshold) abundance (30%). This pasture condition did not provide the necessary nutrition, caused a weakening of animals during the rearing period, and promoted the activation of infectious septicemia in breeding saigas, which, with the combined action of both factors, may have led to their die-off.
    Keywords Russia ; Saiga ; death ; die-off ; food availability ; forage quality ; graminoids ; infectious diseases ; lawns and turf ; pastures ; phytomass ; septicemia ; spring ; steppes ; toxicity ; weather ; Kazakhstan
    Language English
    Dates of publication 2021-10
    Size p. 399-405.
    Publishing place Pleiades Publishing
    Document type Article
    ZDB-ID 2603446-3
    ISSN 2079-0988 ; 2079-0961
    ISSN (online) 2079-0988
    ISSN 2079-0961
    DOI 10.1134/S2079096121040028
    Database NAL-Catalogue (AGRICOLA)

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