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V Grinberg - One of the best experts on this subject based on the ideXlab platform.

  • an Empirical Method for improving the quality of rxte pca spectra
    The Astrophysical Journal, 2014
    Co-Authors: Javier A Garcia, Jeffrey E Mcclintock, James F Steiner, Ronald A Remillard, V Grinberg
    Abstract:

    United States. National Aeronautics and Space Administration (Hubble Fellowship Grant HST-HF-51315.01)

  • an Empirical Method for improving the quality of rxte pca spectra
    arXiv: Instrumentation and Methods for Astrophysics, 2014
    Co-Authors: Javier A Garcia, Jeffrey E Mcclintock, James F Steiner, Ronald A Remillard, V Grinberg
    Abstract:

    We have developed a correction tool to improve the quality of RXTE HEXTE spectra by employing the same Method we used earlier to improve the quality of RXTE PCA spectra. We fit all of the hundreds of HEXTE spectra of the Crab individually to a simple power-law model, some 37 million counts in total for Cluster A and 39 million counts for Cluster B, and we create for each cluster a combined spectrum of residuals. We find that the residual spectrum of Cluster A is free of instrumental artifacts while that of Cluster B contains significant features with amplitudes ~1%; the most prominent is in the energy range 30-50 keV, which coincides with the iodine K edge. Starting with the residual spectrum for Cluster B, via an iterative procedure we created the calibration tool hexBcorr for correcting any Cluster B spectrum of interest. We demonstrate the efficacy of the tool by applying it to Cluster B spectra of two bright black holes, which contain several million counts apiece. For these spectra, application of the tool significantly improves the goodness of fit, while affecting only slightly the broadband fit parameters. The tool may be important for the study of spectral features, such as cyclotron lines, a topic that is beyond the scope of this paper.

Xiaojun Cheng - One of the best experts on this subject based on the ideXlab platform.

  • An Empirical Method in correcting specular highlight phenomenon in TLS intensity data
    IEEE Access, 2016
    Co-Authors: Kai Tan, Kunbo Liu, Xiaojun Cheng
    Abstract:

    The intensity value recorded by terrestrial laser scanning (TLS) systems is significantly influenced by incidence angles. Most existing models focus on the diffuse reflection of rough surfaces and ignore the specular reflection, despite that both reflections simultaneously exist in all natural surfaces. At large incidence angles, specular reflection can be neglected. However, laser detectors can receive a portion of specular reflection at small incidence angles. Specular reflection can lead to additional increase in the original intensity data and even highlight phenomenon on scanned targets, especially those with a relatively smooth or highly reflective surface. In this paper, a new Empirical Method is proposed to correct the intensities of highlight regions caused by the specular reflection. The intensity from the specular reflection is obtained by subtracting the intensity caused by diffuse reflection and instrumental effects from the original intensity. The proposed Method is tested and validated on different targets scanned by Faro Focus 3D 120. Results imply that the proposed Method can effectively eliminate the highlight phenomenon in TLS for 3-D point cloud representation by intensity and intensity image interpretation.

Javier A Garcia - One of the best experts on this subject based on the ideXlab platform.

  • an Empirical Method for improving the quality of rxte pca spectra
    The Astrophysical Journal, 2014
    Co-Authors: Javier A Garcia, Jeffrey E Mcclintock, James F Steiner, Ronald A Remillard, V Grinberg
    Abstract:

    United States. National Aeronautics and Space Administration (Hubble Fellowship Grant HST-HF-51315.01)

  • an Empirical Method for improving the quality of rxte pca spectra
    arXiv: Instrumentation and Methods for Astrophysics, 2014
    Co-Authors: Javier A Garcia, Jeffrey E Mcclintock, James F Steiner, Ronald A Remillard, V Grinberg
    Abstract:

    We have developed a correction tool to improve the quality of RXTE HEXTE spectra by employing the same Method we used earlier to improve the quality of RXTE PCA spectra. We fit all of the hundreds of HEXTE spectra of the Crab individually to a simple power-law model, some 37 million counts in total for Cluster A and 39 million counts for Cluster B, and we create for each cluster a combined spectrum of residuals. We find that the residual spectrum of Cluster A is free of instrumental artifacts while that of Cluster B contains significant features with amplitudes ~1%; the most prominent is in the energy range 30-50 keV, which coincides with the iodine K edge. Starting with the residual spectrum for Cluster B, via an iterative procedure we created the calibration tool hexBcorr for correcting any Cluster B spectrum of interest. We demonstrate the efficacy of the tool by applying it to Cluster B spectra of two bright black holes, which contain several million counts apiece. For these spectra, application of the tool significantly improves the goodness of fit, while affecting only slightly the broadband fit parameters. The tool may be important for the study of spectral features, such as cyclotron lines, a topic that is beyond the scope of this paper.

Dominique Richon - One of the best experts on this subject based on the ideXlab platform.

  • Empirical Method for estimation of Henry’s law constant of non-electrolyte organic compounds in water
    The Journal of Chemical Thermodynamics, 2012
    Co-Authors: Farhad Gharagheizi, Ali Eslamimanesh, Amir H Mohammadi, Dominique Richon
    Abstract:

    Abstract Henry’s law constant is a significant parameter in description of the phase behaviour of the dilute aqueous solutions. In this communication, a reliable Empirical Method is proposed for representing/predicting the Henry’s law constant (HLC) of 1816 non-electrolyte organic compounds from different chemical families in water within the (293.15 to 298.15) K temperature range. The normal boiling point temperature, critical pressure, number of phenol/enol/carboxyl OH, hydrogen atoms attached to carbon atom, aliphatic groups attached to OH bond, hydrogen atoms attached to carbon atom with hybridisation sp 3 in each compound, and existences of C–N and C–O bonds in each molecule are applied as the parameters of this correlation. The overall absolute average deviation observed on the calculated and predicted Henry’s constant values with respect to experimental ones is about 10% (based on logarithm of HLC values). The simple correlation presented here can be easily applied for rapid estimation of the Henry’s law constants of many of commonly-used organic compounds in water at specified conditions.

  • Empirical Method for estimation of Henry's law constant of non-electrolyte organic compounds in water
    Journal of Chemical Thermodynamics, 2012
    Co-Authors: Farhad Gharagheizi, Ali Eslamimanesh, Amir H Mohammadi, Dominique Richon
    Abstract:

    Henry's law constant is a significant parameter in description of the phase behaviour of the dilute aqueous solutions. In this communication, a reliable Empirical Method is proposed for representing/predicting the Henry's law constant (HLC) of 1816 non-electrolyte organic compounds from different chemical families in water within the (293.15 to 298.15) K temperature range. The normal boiling point temperature, critical pressure, number of phenol/enol/carboxyl OH, hydrogen atoms attached to carbon atom, aliphatic groups attached to OH bond, hydrogen atoms attached to carbon atom with hybridisation sp(3) in each compound, and existences of C-N and C-O bonds in each molecule are applied as the parameters of this correlation. The overall absolute average deviation observed on the calculated and predicted Henry's constant values with respect to experimental ones is about 10% (based on logarithm of HLC values). The simple correlation presented here can be easily applied for rapid estimation of the Henry's law constants of many of commonly-used organic compounds in water at specified conditions.

  • Empirical Method for Representing the Flash-Point Temperature of Pure Compounds
    Industrial & Engineering Chemistry Research, 2011
    Co-Authors: Farhad Gharagheizi, Ali Eslamimanesh, Amir H Mohammadi, Dominique Richon
    Abstract:

    Flash point temperature is one of the most-widely used physical properties for the evaluation of the flammability hazard of combustible liquids. In this communication, an Empirical Method involving normal boiling-point temperature and number of carbon atoms of the pure compounds is presented for accurate representation of the flash-point temperature of pure substances. A total of 1471 pure compounds belonging to 77 chemical families were used to develop a general correlation. The global absolute average deviation of the model results from experimental values is 2.4%. A successful comparison is finally made with respect to some of the Methods proposed in the literature, which apply a similar approach for calculation of the flash-point temperature of pure compounds.

Jeffrey E Mcclintock - One of the best experts on this subject based on the ideXlab platform.

  • an Empirical Method for improving the quality of rxte pca spectra
    The Astrophysical Journal, 2014
    Co-Authors: Javier A Garcia, Jeffrey E Mcclintock, James F Steiner, Ronald A Remillard, V Grinberg
    Abstract:

    United States. National Aeronautics and Space Administration (Hubble Fellowship Grant HST-HF-51315.01)

  • an Empirical Method for improving the quality of rxte pca spectra
    arXiv: Instrumentation and Methods for Astrophysics, 2014
    Co-Authors: Javier A Garcia, Jeffrey E Mcclintock, James F Steiner, Ronald A Remillard, V Grinberg
    Abstract:

    We have developed a correction tool to improve the quality of RXTE HEXTE spectra by employing the same Method we used earlier to improve the quality of RXTE PCA spectra. We fit all of the hundreds of HEXTE spectra of the Crab individually to a simple power-law model, some 37 million counts in total for Cluster A and 39 million counts for Cluster B, and we create for each cluster a combined spectrum of residuals. We find that the residual spectrum of Cluster A is free of instrumental artifacts while that of Cluster B contains significant features with amplitudes ~1%; the most prominent is in the energy range 30-50 keV, which coincides with the iodine K edge. Starting with the residual spectrum for Cluster B, via an iterative procedure we created the calibration tool hexBcorr for correcting any Cluster B spectrum of interest. We demonstrate the efficacy of the tool by applying it to Cluster B spectra of two bright black holes, which contain several million counts apiece. For these spectra, application of the tool significantly improves the goodness of fit, while affecting only slightly the broadband fit parameters. The tool may be important for the study of spectral features, such as cyclotron lines, a topic that is beyond the scope of this paper.