20 research outputs found

    Age Dynamics of Changes in Thyroid Volume

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    Age dynamics of increase in thyroid volume (TV) was studied in healthy persons of both sex. TV was determined based on ultrasound measurements of three linear parameters : length (a), width (b) and thickness (c). TV was calculated with the formula : TV = 2Ă—(0.524Ă—aĂ—bĂ—c). There were 5291 males and 6153 females, whose ages ranged from 3-31 years. Following parameters were studied : absolute increase of TV, growth rate and increase rate of TV, relative growth rate of TV. TV growth was found to be irregular in different age periods. Differences in TV growth between men ane women as well as age periods of the most marked TV growth were ascertained. The obtained results allow to evaluate changes in TV in healthy persons most objectively

    Evaluation of sensory component of psycho-physiological state qualified fighters in the dynamics of accruing efficiency

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    Sensory components of a psychophysiological condition with the help of a computer system of diagnostics are construed. 11 sportsmen of a high class of a combined team of Ukraine have been inspected. It is exhibited, that in dynamic of increasing serviceability at sportsmen the tendency to improving parameters of a sensory component of a psychophysiological condition is marked. The estimation of psychophysiological condition of an organism of sportsmen with the help of differentiated scales enables to adjust training loadings in dynamic of increasing serviceability

    Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC

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    Influences of voltage–current characteristic difference on quench development in low-Tc and high-Tc superconducting devices (Review)

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    We review the approaches in analysis of quench development in LTS and HTS superconducting devices. Considering description of quench from very general point of view, we analyze how the change from sharp voltage–current characteristics with high-index n to smooth characteristics with low n and other material parameters affects quench dynamics. We compare traditional approaches for the description of the quench development in LTS devices with new approaches suggested for HTS devices. Reduction of index value n and high-operating temperature leads to a change of the quench development time, temperature rising rate that make it unnecessary to use the term “normal zone propagation” for describing quench in HTS devices

    Analysis of stability and quench in HTS devices—New approaches

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    R&D of HTS devices are in their full steam—more magnets and devices are developed with larger sizes. But analysis of their stability and quench was still old fashioned, based on normal zone determination, analysis of its appearance and propagation. Some peculiarities of HTS make this traditional, quite impractical and inconvenient approach to consideration of HTS devices stability and quench development using normal zone origination and propagation analysis. The novel approaches were developed that consider the HTS device as a cooled medium with non-linear parameters with no mentioning of “superconductivity” in the analysis. The approach showed its effectiveness and convenience to analyze the stability and quench development in HTS devices. In this paper the analysis of difference between HTS and LTS quench, dependent on index n and specific heat comparison, is followed by the short approach descriptions and by the consequences from it for the HTS devices design. The further development of the method is presented for the analysis of long HTS objects where “blow-up” regimes may happen. This is important for design and analysis of HTS power cables operations under overloading condition

    Stability and quench development study in small HTSC magnet

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    Stability and quench development in a HTSC magnet have been experimentally studied with the transport current in the magnet being below or above the “thermal quench current” level. The magnet was tested at both cryocooler cooling and liquid nitrogen cooling, with and without background magnetic field (up to 4 T). The temperature and electrical voltages in different sections of the magnet were measured using 20 thermocouples and 24 potential taps embedded in the winding. In this paper, the experimental procedure and the results are described. The results are compared with those obtained earlier in the experiments with the smaller HTSC specimens and are analysed by using the scaling theory of the thermal quench
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