The Experts below are selected from a list of 141 Experts worldwide ranked by ideXlab platform

Zenbe-e Nakagawa - One of the best experts on this subject based on the ideXlab platform.

  • Thermal expansion of grain-boundary cracked aluminium titanate ceramics
    Journal of Materials Science, 1996
    Co-Authors: Yutaka Ohya, Yasutaka Takahashi, Zenbe-e Nakagawa
    Abstract:

    The relation between thermal expansion coefficient and grain-boundary crack volume of aluminium titanate ceramics has been calculated based on the thermal expansion data of a single crystal. The calculation began with the drawing of a Frequency Distribution Curve of the thermal expansion coefficient for a single grain. Using the single-grain Distribution Curve, a Distribution Curve of an average coefficient for two adjacent grains was derived. The thermal expansion with a partially grain-boundary cracked body was calculated in relation to the amount of cracked boundary from the average Distribution Curves. The expected relation between crack volume and thermal expansion was close to that of the experimental data.

Yutaka Ohya - One of the best experts on this subject based on the ideXlab platform.

  • Thermal expansion of grain-boundary cracked aluminium titanate ceramics
    Journal of Materials Science, 1996
    Co-Authors: Yutaka Ohya, Yasutaka Takahashi, Zenbe-e Nakagawa
    Abstract:

    The relation between thermal expansion coefficient and grain-boundary crack volume of aluminium titanate ceramics has been calculated based on the thermal expansion data of a single crystal. The calculation began with the drawing of a Frequency Distribution Curve of the thermal expansion coefficient for a single grain. Using the single-grain Distribution Curve, a Distribution Curve of an average coefficient for two adjacent grains was derived. The thermal expansion with a partially grain-boundary cracked body was calculated in relation to the amount of cracked boundary from the average Distribution Curves. The expected relation between crack volume and thermal expansion was close to that of the experimental data.

Amund Ringvold - One of the best experts on this subject based on the ideXlab platform.

  • THE CUMULATIVE Frequency Distribution Curve OF THE EYE PRESSURE
    Acta ophthalmologica, 2009
    Co-Authors: Martin Davanger, Amund Ringvold
    Abstract:

    Knowledge of the probability of having glaucoma at different levels of eye pressure is a prerequisite for estimating at which eye pressure levels preventive pressure-lowering treatment ought to be applied. The glaucoma tolerance may not be the same in all population groups. Calculation of tolerance Distribution Curves may be performed if the Frequency Distribution Curves of pressure in eyes with and without glaucoma are known. Regression analysis has been performed to compute Curves approaching the cumulative Frequency Distribution of the eye pressure in different subgroups. Results of a population study including subjects greater than or equal to 65 years of age have been used. An equation describing an asymmetric sigmoid Curve has been applied in the Curve fitting procedure. The derivative of this equation was used to describe the noncumulative Frequency Distribution Curves. The analysis has been performed in subgroups consisting of normal eyes, glaucomatous eyes, eyes with and without pseudo-exfoliation.

P Julu - One of the best experts on this subject based on the ideXlab platform.

  • Vagolytic effect of diabetes mellitus.
    Brain : a journal of neurology, 1993
    Co-Authors: P Julu
    Abstract:

    The amplitude of respiratory sinus arrhythmia was quantified as the ratio of the longest to the shortest R-R intervals in electrocardiograms recorded during deep inspirations and forced expirations in the supine position. The mean of the absolute differences between consecutive R-R intervals recorded during normal quiet breathing in a supine position was also calculated. Since these two tests measure only cardiac parasympathetic function, they were used to assess the resting vagal tone in 165 patients with diabetes mellitus and 116 healthy volunteers (controls). The Frequency Distribution Curve of resting vagal tone was Gaussian in the controls and was also negatively correlated with age and height. The Frequency Distribution Curve of resting vagal tone was skewed in the diabetic population where a majority of patients had low vagal tone. The correlation of vagal tone with age was stronger than in controls, but there was no correlation of vagal tone with height in diabetic patients. The mean resting vagal tone in diabetic patients was reduced by 40%, and the whole Frequency Distribution Curve was also shifted to the left by 40% relative to the control Curve. It is concluded that there is a substantial impairment of cardiac vagal function in most diabetic patients, contrary to current belief. Clinical tests which include measurement of vagal tone may give a bias towards low values in diabetic patients because of the shift to the left in the Distribution Curve of vagal tone in the diabetic population.(ABSTRACT TRUNCATED AT 250 WORDS)

  • Vagolytic effect of diabetes mellitus
    Brain, 1993
    Co-Authors: P Julu
    Abstract:

    The amplitude of respiratory sinus arrhythmia was quantified as the ratio of the longest to the shortest R—R intervals in electrocardiograms recorded during deep inspirations and forced expirations in the supine position. The mean of the absolute differences between consecutive R—R intervals recorded during normal quiet breating in a supine position was also calculated. Since these two tests measure only cardiac parasympathetic function, they were used to assess the resting vagal tone in 165 patients with diabetes mellitus and 116 healthy volunteers (controls). The Frequency Distribution Curve of resting vagal tone was Gaussian in the controls and was also negatively correlated with age and height. The Frequency Distribution Curve of resting vagal tone was skewed in the diabetic population where a majority of patients had low vagal tone. The correlation of vagal tone with age was stronger than in controls, but there was no correlation of vagal tone with height in diabetic patients. The mean resting vagal tone in diabetic patients was reduced by 40%, and the whole Frequency Distribution Curve was also shifted to the left by 40% relative to the control Curve. It is concluded that there is a substantial impairment of cardiac vagal function in most diabetic patients, contrary to current belief. Clinical tests which include measurement of vagal tone may give a bias towards low values in diabetic patients because of the shift to the left in the Distribution Curve of vagal tone in the diabetic population. It may therefore be necessary to measure resting vagal tone separately using one of the two tests described here for critical interpretation of results of autonomic function test in diabetic patients.

Mingyi Zhang - One of the best experts on this subject based on the ideXlab platform.

  • estimating soil freezing characteristic Curve based on pore size Distribution
    Applied Thermal Engineering, 2017
    Co-Authors: Chong Wang, Yuanming Lai, Mingyi Zhang
    Abstract:

    Abstract A clear fundamental understanding of the soil freezing characteristic Curve is crucial for studying soil freezing behavior. In this paper, based on the assumption that the shape of the soil freezing characteristic Curve is mainly dependent upon the pore-size Distribution of the soil, a mathematic model for estimating the soil freezing characteristic Curve is proposed. The formula has the form of an integrated Frequency Distribution Curve, which is verified by previous researches (seven representative soil samples and six representative mineral compositions, a number of special mineral particles and soils, and unsaturated soils). By nonlinear Curve fitting, the correlation coefficients are generally larger than 0.95. The proposed model is more convenient than the original empirical formulas in numerical modeling, and it can overcome the shortcoming that the original empirical formulas are not derivative at the temperatures near the freezing point. In addition, the proposed model directly expresses the relationship between residual unfrozen water content and temperature under extremely low temperature conditions. Of course, the new model and results in this study may provide a reference for the research on basic physical properties of freezing soils, and the related numerical modeling in cold regions engineering.