The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform

David B Wolff - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of trmm ground validation radar rain errors using rain Gauge measurements
    Journal of Applied Meteorology and Climatology, 2010
    Co-Authors: Jianxin Wang, David B Wolff
    Abstract:

    Abstract Ground-validation (GV) radar-rain products are often utilized for validation of the Tropical Rainfall Measuring Mission (TRMM) space-based rain estimates, and, hence, quantitative evaluation of the GV radar-rain product error characteristics is vital. This study uses quality-controlled Gauge data to compare with TRMM GV radar rain rates in an effort to provide such error characteristics. The results show that significant differences of concurrent radar–Gauge rain rates exist at various time scales ranging from 5 min to 1 day, despite lower overall long-term bias. However, the differences between the radar area-averaged rain rates and Gauge Point rain rates cannot be explained as due to radar error only. The error variance separation method is adapted to partition the variance of radar–Gauge differences into the Gauge area–Point error variance and radar-rain estimation error variance. The results provide relatively reliable quantitative uncertainty evaluation of TRMM GV radar-rain estimates at var...

Bingyou Jiang - One of the best experts on this subject based on the ideXlab platform.

  • effects of changes in pipe cross section on the explosion proof distance and the propagation characteristics of gas explosions
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Bingyou Jiang, Fanjun Gu
    Abstract:

    Abstract After establishing a pipe model with a length of 100 m, the propagation characteristics of gas deflagrations were simulated using AutoReaGas software for pipe cross-sectional areas of 0.04 m × 0.04 m, 0.08 m × 0.08 m, 0.12 m × 0.12 m and 0.16 m × 0.16 m. The results showed that the pipe cross-section had a distinct effect on the overpressure, density, temperature, gas velocity and combustion rate of gas explosions. Specifically, as the equivalent pipe diameter increased, the maximum overpressure, density, temperature, gas velocity and combustion rate at each Gauge Point decreased. As the equivalent pipe diameter increased, the flame arrival time at each Gauge Point was consequently delayed. In addition, the increase in the equivalent pipe diameter decreased the explosion-proof distance, as well as the dimensionless safety distance. In addition, increasing the equivalent pipe diameter can largely reduce the dimensionless flame-proof distance, thereby making mining workers immune to the threat of gas explosion shockwaves.

Jianxin Wang - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of trmm ground validation radar rain errors using rain Gauge measurements
    Journal of Applied Meteorology and Climatology, 2010
    Co-Authors: Jianxin Wang, David B Wolff
    Abstract:

    Abstract Ground-validation (GV) radar-rain products are often utilized for validation of the Tropical Rainfall Measuring Mission (TRMM) space-based rain estimates, and, hence, quantitative evaluation of the GV radar-rain product error characteristics is vital. This study uses quality-controlled Gauge data to compare with TRMM GV radar rain rates in an effort to provide such error characteristics. The results show that significant differences of concurrent radar–Gauge rain rates exist at various time scales ranging from 5 min to 1 day, despite lower overall long-term bias. However, the differences between the radar area-averaged rain rates and Gauge Point rain rates cannot be explained as due to radar error only. The error variance separation method is adapted to partition the variance of radar–Gauge differences into the Gauge area–Point error variance and radar-rain estimation error variance. The results provide relatively reliable quantitative uncertainty evaluation of TRMM GV radar-rain estimates at var...

Fanjun Gu - One of the best experts on this subject based on the ideXlab platform.

  • effects of changes in pipe cross section on the explosion proof distance and the propagation characteristics of gas explosions
    Journal of Natural Gas Science and Engineering, 2015
    Co-Authors: Bingyou Jiang, Fanjun Gu
    Abstract:

    Abstract After establishing a pipe model with a length of 100 m, the propagation characteristics of gas deflagrations were simulated using AutoReaGas software for pipe cross-sectional areas of 0.04 m × 0.04 m, 0.08 m × 0.08 m, 0.12 m × 0.12 m and 0.16 m × 0.16 m. The results showed that the pipe cross-section had a distinct effect on the overpressure, density, temperature, gas velocity and combustion rate of gas explosions. Specifically, as the equivalent pipe diameter increased, the maximum overpressure, density, temperature, gas velocity and combustion rate at each Gauge Point decreased. As the equivalent pipe diameter increased, the flame arrival time at each Gauge Point was consequently delayed. In addition, the increase in the equivalent pipe diameter decreased the explosion-proof distance, as well as the dimensionless safety distance. In addition, increasing the equivalent pipe diameter can largely reduce the dimensionless flame-proof distance, thereby making mining workers immune to the threat of gas explosion shockwaves.

Oliver H Gao - One of the best experts on this subject based on the ideXlab platform.

  • combining mwl and msg seviri satellite signals for rainfall detection and estimation
    Atmosphere, 2020
    Co-Authors: Kingsley K Kumah, Joost C B Hoedjes, Noam David, B H P Maathuis, Oliver H Gao
    Abstract:

    Accurate rainfall detection and estimation are essential for many research and operational applications. Traditional rainfall detection and estimation techniques have achieved considerable success but with limitations. Thus, in this study, the relationships between the Gauge (Point measurement) and the microwave links (MWL) rainfall (line measurement), and the MWL to the satellite observations (area-wide measurement) are investigated for (area-wide) rainfall detection and rain rate retrieval. More precisely, we investigate if the combination of MWL with Meteosat Second Generation (MSG) satellite signals could improve rainfall detection and rainfall rate estimates. The investigated procedure includes an initial evaluation of the MWL rainfall estimates using Gauge measurements, followed by a joint analysis of the rainfall estimates with the satellite signals by means of a conceptual model in which clouds with high cloud top optical thickness and large particle sizes have high rainfall probabilities and intensities. The analysis produced empirical thresholds that were used to test the capability of the MSG satellite data to detect rainfall on the MWL. The results from Kenya, during the “long rains” of 2013, 2014, and 2018 show convincing performance and reveal the potential of MWL and MSG data for area-wide rainfall detection.