Technical experience: Space Sciences/Physics; Data algorithm development; Signal processing and analysis; Hardware and software development; Orbit analysis. Management experience: Management of religious organization; Strategic planning. 

Ph.D., (Astro)Physics, Catholic University of America
MS, Physics, Catholic University of America
BS, Physics, Fu-Jen University

Professional/Technical Training Courses:

Satellite Communications (Catholic University of America, 1991)
Signal Processing and Analysis (Catholic University of America, 1992)
Interactive Dialog Language Widget Programming (GSFC/NASA, 1995)

Studying/analyzing the abundance of the important interstellar molecule, CH2, in a cold translucent cloud to verify basic reaction channels of interstellar hydrocarbon chemistry. This study for understanding gas phase chemistry of CH2 in dense clouds is essential for understanding the relevant processes leading to star formation. Using high resolution and high signal-to-noise Hubble Space Telescope spectral data of UV Fe II lines to construct the temperature versus velocity profile for infalling gas of Beta Pictoris. Examining the high velocity infall and finding that it is most possibly due to shock dissipation of gas passing through the spiral shocks. Performing a quantitative analysis of the complex red-shifted absorption line features in Beta Pictoris, arising from the excited metastable, and ground configurations of Fe II. And determining appropriate models to explain the high velocity gaseous infall.

Responsible for the science verification of TSDIS Level 1B codes (in C), modifying Level 1B Browse codes to generate higher resolution browse products, and for the development of algorithms for the extraction of science parameters from the Tropical Rainfal Measuring Mission(TRMM)/Visible and Infrared Sensor (VIRS) Level 1B data. Responsible for the technical support in the area of microwave sensing of water vapor from remote sensors (Microwave Imaging Radiometer, MIR). Use STK (Satellite Tool Kits) to setup satellite orbit scenarios and to determine when and where two or more satellites would look at the same footprints (i.e., coincident measurement). And we could determine when satellites come to some close distances. To continue on the evaluation of the satellite image and data processing tools. This includes the Satellite Tool Kits (STK), and the IDL ENVI (the Environment for Visualizing Images) softwares.  Customization of the files, procedures, databases will be implemented in the TSDIS SyBase (SQL) computer working environment. Develop MIR data system algorithm and implement spectral radiometric analysis for both VIRS and MIR. Develop algorithms for monitoring the TRMM/VIRS performance in post-launch check-out and monitoring of the VIRS on orbit performance. Develop also for the MIR both data reduction codes in Quick Basic and image visualization/processing IDL widget codes, implementing baseline and limb brightening correction and a new calibration scheme, and solving Window NT network related problems. All the work for MIR are conducted in Window NT 4.0 environment. 

Modelling Venus Neutral Upper Atmosphere using Magellan drag measurements and modifying/enhancing Collage (developed both in C++ and C) Project (for Macintosh version only) for visualization and analysis of HDF 4.0 data objects. Producing standardized (FITS) documentations for astronomical catalogs(data), archived by the Astronomical Data Center, NASA/GSFC, so that researchers can easily access and manipulate the data using popular astronomical data analysis packages such as  IRAF, MIDAS, IDL and through the Astrophysics Data System. Performed conversion of existing IDL astronomy routines to support all platforms (vms, unix, MacOs) and further development 
of the routines related to astronomical utilities, spectral and image processing. Developed Web-based user-friendly data access tools, such as Web search engine using C codes, Perl, HTML, and Scripts, and IDL widget codes, etc., for IDL Astronomy Library.

Responsible for studying radiative transfer/hydrodynamics problems and time-dependent photoionization-shock phenomena in the Local Interstellar Medium (LISM), developing a "backwards differencing" numerical technique for solving differential equations for the rates of change of the abundances of ionic and molecular species, for predicting their abundances and dynamical states in the interstellar medium. Responsible for studying the temperature structures in proto-type planetary systems, e.g. utilizing atomic transitions arising from metastable levels of Fe II to deduce temperature structure in mass infall region of disk around the proto-planetary system candidate, Beta Pictoris. Identified and proved a serious problem with the numerical integration routines in a very popular and powerful scientific software package - Maple V. Developed algorithms, applying medical imaging techniques such as deconvolution with cross-correlation and FFT, and a tomography algorithm, to separate blemish and granularity functions (Fixed-Pattern Noise) from the stellar data. Exploring the effects of the parameters such as IMF (initial mass function), mass loss rates, number of massive stars, energy conserving and
momentum conserving phases on the physical conditions in the expansion of supershells and on the star formation conditions. Responsible for teaching fundamental physics in the Physics Department at 
Catholic University of America. Develop complex computer codes (e.g., time-dependent shock photoionization code and radiative transfer code) in FORTRAN, C, and IDL, both for VAX and for UNIX (with Sun Station and CRAY Y-MP supercomputer system), for processing and analyzing UV spectral data obtained from both the Hubble Space Telescope and the International Ultraviolet Explorer Space Observatories(IUE) at NASA-GSFC. Adopt powerful object(array)-oriented language for the analysis of IUE and HST/GHRS data. Utilized/reduced atomic and molecular (their isotopic variants) data for quantitative analysis of photospheric and interstellar features in UV and millimeter spectra of O and B stars.

Computer Skills:

Computers: VAX, DEC Alpha, SGI, IBM, Cray XMP, Macintosh, Sun, PC
Systems: MacOS, Unix/Lynux, VMS, Windows NT/95, DOS
Languages: Fortran, C, C++, Perl, Quick (structured) BASIC, HTML, CGI, AWK Macintosh Script
Packages: CodeWarrior, MPW, LOTUS 1-2-3, MS WORD/EXCEL, Wordperfect, IDL
DBMS: dBASE , Sybase

1998 (Jun.) : NASA TRMM Group Achievement Award
1998 (Mar.): NASA TRMM (Trop. Rain. Measur. Miss.) Outstanding Performance Award
1995: Astronomical Data Center (NASA/GSFC) Team Award (Hughes STX)
1992: Hubble Space Telescope/GHRS Team Award (NASA/GSFC)

American Geophysical Union
American Astrophysical Society

C.-H. Lyu, W. L. Barnes, and R. A. Barnes, 'First Results From the On-Orbit Calibrations of the Visible and Infrared Scanner for the Tropical Rainfall Measuring Mission', 1999, JAOT, accepted.

R. A. Barnes, W. L. Barnes, C.-H. Lyu, and J. M. Gales, 'An Overview of the VIRS Radiometric Calibration Algorithm', 1999, JAOT, accepted.

C.-H. Lyu, and F. C. Bruhweiler, "Time-Dependent Ionization of H and He in the LISM", 1996, ApJ, 459, 216-225.

G.M. Keating, N.C. Hsu, C.-H. Joseph Lyu, "Improved thermospheric model for the Venus International Reference Atmosphere", Adv. Space Res. (Approved for Publication), 1996. (Presented at 31st Scientific Assemble of COSPAR, Birmingham, England, 1996b).

G.M. Keating, N.C. Hsu, C.-H. Joseph Lyu, R.H. Tolson, "Magellan Thermospheric Measurements of Venus", Annales Geophysicae. 14, suppl. 3, c798, 1996a.

C.-H. Lyu, F.C. Bruhweiler, A.M. Smith, "Tomography/Power Spectrum Techniques For Removal of Fixed Pattern Noise from HST Spectra", 1995, ApJ, 447, 880-888.

G.M. Keating, N.C. Hsu, C.-H. Joseph Lyu, R.H. Tolson, "Venus thermospheric response to solar cycle variations", 1995, Proceedings of 27th annual meeting of the DPS of the AAS, Mauna Lani, Hawaii, 22.

C.-H. Lyu, A.M. Smith, F.C. Bruhweiler, "Statistical Equilibrium Analysis of Interstellar CO toward Zeta Ophiuchi as Recorded by the GHRS", 1994, ApJ, 426, 254-268.

C.-H. Lyu and F.C. Bruhweiler, "Power Spectrum Method for Removing Fixed Pattern Noise from GHRS Spectra", 1993, in Calibrating Hubble Space Telescope, ed. by J.C. Blades and S.J. Osmer (Space Telescope Science Institute), p. 332-335.

C.-H. Lyu, "A Study of Physical Conditions, Radiative Transfer and Shocks in the Interstellar Medium", 1993, Ph.D. dissertation, Catholic University of America.

F. C. Bruhweiler, A. M. Smith, G. Perry and C.-H. Lyu, "Detection of Interstellar C I and C IV within 26 pc of the Sun", 1993, BAAS, V25, N4, 1464.

C.-H. Lyu and F.C. Bruhweiler, "The Effects of Shocks and Radiation Fields on an IS-Bubble inside an H II Region", 1993, BAAS, V25, N2, 897.

C.-H. Lyu, and F.C. Bruhweiler, "The History and Ionization of the Local ISM: The Last Eight Million 
Years", 1992, BAAS, V23, N4, 1364.

A.M. Smith, C.-H. Lyu, F.C. Bruhweiler, "Interstellar CO in the Line-of-Sight to Zeta Ophiuchi as Recorded by the GHRS", 1992, BAAS, V23, N4, 1366. 

A.M. Smith, ..., C.-H. Lyu, "First Results From GHRS: C I, S I, and CO toward Xi Persei and the Physical Conditions in Diffuse Clouds.", 1991, ApJL, 377:L61-L64.

C.-H. Lyu, ``A Study of the Faraday Rotation of Satellite Beacon Signals at Low Latitudes'', 1980, M.S. dissertation, Fu-Jen Catholic University.

C.-H. Lyu, "A Study of Physical Conditions, Radiative Transfer and Shocks in the Interstellar Medium", PhD dissertation presentation in the AAS meeting at Columbus, Ohio, 1992, BAAS, V24, N2, 816.

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