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List of publications on a keyword: «vibration»

  • Occupational and environmental factors affect semen quality: how exposure to mechanical viberation impacts reproductive indices

    Proceeding
    Fundamental and applied research for key propriety areas of bioecology and biotechnology
    Author:
    Abobakr M. Khussein
    Work direction:
    Биомедицинские технологии и биоинформатика
    Abstract:
    It is well known that sperm is a unique cell with a function to be done by itself outside the body and this function is second to none for species’ continuity. The sperm mission of reaching the ova and is affected by both chemical and physical factors influence its ability to survive, move and fertilize the ova. Vibration as an environmental external physical stressor that affect semen viscosity and accordingly semen velocity, is reported to be prevalent among drivers occupied in industrial jobs whose inability to produce natural sperm compared to other occupation will be reviewed in this paper. We will also review the effects of mechanical vibrations with a special attention to shaking semen samples in assisted reproductive technologies in vitro. The effects of whole body exposure to vibrations on reproductive indices will also be investigated.
    Keywords:
    environmental factors, whole body vibration, sperm motility, car drivers, sperm activation in vitro
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  • Analiz issledovanii vysokotemperaturnogo frettinga primenitel'no k razrabotke innovatsionnykh reshenii povysheniia nadezhnosti mashin

    Book Chapter
    Culture. Science. Education: modern trends
    Author:
    Valerii V. Alisin
    Work direction:
    Глава 2. Наука
    Abstract:
    The article is devoted to the development of the direction of work on the creation of qualitatively new innovative solutions to ensure the reliability of connections of machine elements. The recommendations are based on the analysis of studies on wear process of the fixed joints of machine elements during microdisplacements in contact under the influence of vibration at high temperatures. It is established that physical and chemical processes occurring in the area of actual contact of the joint elements are varied and the effect of temperature on tribological characteristics of frictional contact is complex, since with an increase in temperature the reduction of worn-out volume can occur as well as increase of it. To predict the resistance of the contact to fretting, it is necessary to conduct a force analysis on the contact and determine the spectral composition of vibrations affecting the friction contact.
    Keywords:
    friction, wear, fretting, vibration, microdisplacements, high temperatures
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