The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

Chi L. Jiaa - One of the best experts on this subject based on the ideXlab platform.

  • Spectrogram analysis of random laser texture pattern media
    Surface & Coatings Technology, 2000
    Co-Authors: Chi L. Jiaa
    Abstract:

    Abstract The application of spectrogram analysis for characterizing random laser texture pattern on magnetic media is explored in this study. Spectrogram analysis of acoustic emission (AE) signals, consisting of identifying multiple AE signal spectra in the time domain, was carried out. The assignment of the signals in the AE spectra of a Measured Sample facilitated the identification of slider resonances and other excitations in the head–disk interface. The spoke-like lines in the spectrogram are a result of excitation frequencies induced by laser texture patterns. Further AE spectral analysis has facilitated accurate information of slider excitations by varying the randomness of laser texture patterns. Spectrogram analysis was also applied to study various slider air bearing designs. This scheme of analysis has been demonstrated to be useful to study laser texture patterns and slider designs.

  • Spectrogram analysis of random laser texture pattern media
    Surface & Coatings Technology, 1999
    Co-Authors: Chi L. Jiaa
    Abstract:

    Abstract The application of spectrogram analysis for characterizing random laser texture pattern on magnetic media is explored in this study. Spectrogram analysis of acoustic emission (AE) signals, consisting of identifying multiple AE signal spectra in the time domain, was carried out. The assignment of the signals in the AE spectra of a Measured Sample facilitated the identification of slider resonances and other excitations in the head–disk interface. The spoke-like lines in the spectrogram are a result of excitation frequencies induced by laser texture patterns. Further AE spectral analysis has facilitated accurate information of slider excitations by varying the randomness of laser texture patterns. Spectrogram analysis was also applied to study various slider air bearing designs. This scheme of analysis has been demonstrated to be useful to study laser texture patterns and slider designs.

Bo Sun Kang - One of the best experts on this subject based on the ideXlab platform.

  • Neutron diagnostics using Compton suppression gamma-ray spectrometer for tritium breeding blanket experiments
    Fusion Engineering and Design, 2016
    Co-Authors: Seong Pyo Hong, M.s. Cheon, Bo Sun Kang
    Abstract:

    Abstract To obtain tritium breeding ratio in tritium breeding blanket experiments, incident neutron flux measurement is essential. To develop high tritium breeding performance, the more precise neutron flux measurement is required. In this work, the Compton suppression gamma ray spectrometer, which can suppress the expected background noise signals from Compton scatterings, is used to detect the gamma rays from neutron activated indium foils for the purpose of reducing the measurement errors in the neutron activation system (NAS). The statistical error of the Measured Sample activity in the Compton suppressed system is estimated to be about 2.8% from the counting error (1.4%) and the detector efficiency error (2.4%), and the statistical error of the Measured Sample activity in the non-suppressed system was estimated to be about 4.7% (from the counting error 2.0% and the detector efficiency error 4.3%) in KSTAR experiment. This system can be applied to ITER TBM and future nuclear fusion devices.

  • Neutron diagnostics using Compton suppression gamma-ray spectrometer for tritium breeding blanket experiments
    Fusion Engineering and Design, 2016
    Co-Authors: C.s. Kim, Seong Pyo Hong, M.s. Cheon, Bo Sun Kang, S. Cho
    Abstract:

    Abstract To obtain tritium breeding ratio in tritium breeding blanket experiments, incident neutron flux measurement is essential. To develop high tritium breeding performance, the more precise neutron flux measurement is required. In this work, the Compton suppression gamma ray spectrometer, which can suppress the expected background noise signals from Compton scatterings, is used to detect the gamma rays from neutron activated indium foils for the purpose of reducing the measurement errors in the neutron activation system (NAS). The statistical error of the Measured Sample activity in the Compton suppressed system is estimated to be about 2.8% from the counting error (1.4%) and the detector efficiency error (2.4%), and the statistical error of the Measured Sample activity in the non-suppressed system was estimated to be about 4.7% (from the counting error 2.0% and the detector efficiency error 4.3%) in KSTAR experiment. This system can be applied to ITER TBM and future nuclear fusion devices.

Aldo Badano - One of the best experts on this subject based on the ideXlab platform.

  • Monte Carlo X-ray transport simulation of small-angle X-ray scattering instruments using Measured Sample cross sections
    Journal of Applied Crystallography, 2016
    Co-Authors: Mina Choi, Bahaa Ghammraoui, Andreu Badal, Aldo Badano
    Abstract:

    Small-angle X-ray scattering (SAXS) has recently been proposed as a novel noninvasive in vivo molecular imaging technique to characterize molecular interactions deep within the body using high-contrast probes. This article describes a detailed Monte Carlo X-ray transport simulation technique that utilizes user-provided cross sections to describe X-ray interaction in virtual Samples and explore SAXS instrument design choices. The accuracy of the simulation code is validated with Sample material cross sections derived from analytical models and empirical measurements of a homogeneous spherical gold nanoparticle (GNP) monomer, a dimer and heterogeneous mixtures of the two in aqueous solution. Analytical and Measured scattering profiles from these Samples were converted to cross sections using an absolute water standard. Our Monte Carlo estimates of the fraction of dimers from analytically derived and empirically derived cross sections are strongly correlated, with less than 1.5 and 16% error, respectively, to the expected concentration of monomer and dimer species. In addition, a variety of monoenergetic X-ray beams were simulated to investigate coherent scattering versus radiation dose for a range of Sample sizes. For GNP spheres in aqueous solution, the energy range that produces the most coherent scattering at the detector per deposited energy was between 31 and 49 keV for a Sample thickness of 1 mm to 10 cm. The method described here for the detailed simulation of SAXS using Measured and modeled cross sections will enable instrumentation optimization for in vivo molecular imaging applications.

Seong Pyo Hong - One of the best experts on this subject based on the ideXlab platform.

  • Neutron diagnostics using Compton suppression gamma-ray spectrometer for tritium breeding blanket experiments
    Fusion Engineering and Design, 2016
    Co-Authors: Seong Pyo Hong, M.s. Cheon, Bo Sun Kang
    Abstract:

    Abstract To obtain tritium breeding ratio in tritium breeding blanket experiments, incident neutron flux measurement is essential. To develop high tritium breeding performance, the more precise neutron flux measurement is required. In this work, the Compton suppression gamma ray spectrometer, which can suppress the expected background noise signals from Compton scatterings, is used to detect the gamma rays from neutron activated indium foils for the purpose of reducing the measurement errors in the neutron activation system (NAS). The statistical error of the Measured Sample activity in the Compton suppressed system is estimated to be about 2.8% from the counting error (1.4%) and the detector efficiency error (2.4%), and the statistical error of the Measured Sample activity in the non-suppressed system was estimated to be about 4.7% (from the counting error 2.0% and the detector efficiency error 4.3%) in KSTAR experiment. This system can be applied to ITER TBM and future nuclear fusion devices.

  • Neutron diagnostics using Compton suppression gamma-ray spectrometer for tritium breeding blanket experiments
    Fusion Engineering and Design, 2016
    Co-Authors: C.s. Kim, Seong Pyo Hong, M.s. Cheon, Bo Sun Kang, S. Cho
    Abstract:

    Abstract To obtain tritium breeding ratio in tritium breeding blanket experiments, incident neutron flux measurement is essential. To develop high tritium breeding performance, the more precise neutron flux measurement is required. In this work, the Compton suppression gamma ray spectrometer, which can suppress the expected background noise signals from Compton scatterings, is used to detect the gamma rays from neutron activated indium foils for the purpose of reducing the measurement errors in the neutron activation system (NAS). The statistical error of the Measured Sample activity in the Compton suppressed system is estimated to be about 2.8% from the counting error (1.4%) and the detector efficiency error (2.4%), and the statistical error of the Measured Sample activity in the non-suppressed system was estimated to be about 4.7% (from the counting error 2.0% and the detector efficiency error 4.3%) in KSTAR experiment. This system can be applied to ITER TBM and future nuclear fusion devices.

Arlan W. Mantz - One of the best experts on this subject based on the ideXlab platform.

  • Corrections to Measured Sample pressures in low temperature collisional cooling experiments
    Spectrochimica acta. Part A Molecular and biomolecular spectroscopy, 2002
    Co-Authors: Ross F Gobeille, Arlan W. Mantz
    Abstract:

    Three different thermal transpiration models have been tested for a range of pressures and temperatures normally encountered in collisional cooling experiments. The calculated corrections for two of these models follow similar patterns and differ only in magnitude at a fixed Sample temperature for Sample pressures between 0 and 8 Torr. Corrections calculated from the third model follow a pattern similar to the other two models only at pressures above about two Torr.