John Xun Yang

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Passive microwave radiometer data over the ocean have been widely used, but data near coastlines or over lakes often cannot be used because of the large footprint with mixed signals from both land and water. For example, current standard Special Sensor Microwave Imager (SSM/I) products, including wind, water vapor, and precipitation , are typically(More)
—We develop methods of using boreal, temperate, and tropical forests as vicarious calibration sites for spaceborne microwave radiometers. The extended sites and improved calibration techniques enable examining warm-scene performances as a complement to cold scenes over the ocean, providing information about scan-dependent biases, detecting and correcting(More)
A method is proposed for defining a probability distribution on an ensemble of protein conformations from a 2D NOE spectrum, while at the same time back-calculating the experimental spectrum from the ensemble. This enables one to assess the relative quality and significance of the conformations, and to test the consistency of the ensemble as a whole with(More)
 Science and applications of remote sensing: Ocean surface wind speed and atmospheric precipitation retrieval in tropical cyclones using airborne and spaceborne passive microwave observations. Vicarious statistical calibration methods for microwave radiometry. Detection and mitigation of radio frequency interference. Measurement of non-thermal planetary(More)
The Earth-scene brightness temperature (TB) seen by satellite radiometers is generally cold over the ocean due to low emissivity, warm over land with high emissivity, and with a large dynamic range dependent on frequency and polarization. Calibration at either cold or warm end cannot fully characterize the calibration dependence on the full TB dynamic(More)
Throughout the course of my Ph.D. program, I have worked on a multitude of different projects, many of which do not appear in this thesis. Nonetheless, I'd like to acknowledge here everyone who has made a significant contribution to my research and education in the past several years. First, I would like to acknowledge my research advisor, Chris Ruf. I, as(More)
A new computational method for simultaneously estimating all the proton-proton coupling constants in a molecule from COSY spectra [Yang, J.-X. and Havel, T.F. (1994) J. Biomol. NMR, 4, 807-826] is applied to experimental data from two polypeptides. The first of these is a cyclic hexapeptide denoted as VDA (-D-Ala1-Phe2-Trp3-Lys(Z)4-Val5-Phe6-), in(More)
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