Alan H. Guth, Visiting Scientist, Massachusetts Institute of Technology. 

 "Possible Mechanisms for the Creation of a Universe," with Irwin 

 Shapiro, from January 1 to September 30, 1990. 



Xiaofeng Han, Predoctoral Fellow, Harbin Institute of Technology, China. 



"Laser Spectroscopy and Applications," with W.H. Parkinson, from October 

 1, 1989 to September 30, 1991. 



Hardy M. Hodges, Postdoctoral Fellow, University of Chicago. "Universe 



Cosmology," with Irwin Shapiro, from August 1, 1990 to July 31, 1991. 



Bengt Anders Kail, Visiting Student, Chalmers University of Technology. 



"Modelling of Radiometric Measurements of Horizontal Variations of the 

 Radio Refractivity of Water Vapor," with James Davis, from May 29 to 

 August 31, 1990. 



Bon-Chul Koo, Postdoctoral Fellow, University of California, Berkeley. "The 

 Study of Infrared Worms and an Observational Study of Old Supernova 

 Remnants," with Irwin Shapiro, from September 1, 1990 to August 31, 

 1992. 



Enrico Koper, Visiting Scientist, Leiden University. "Observations of 

 M31,"with P. Thaddeus, from October 17, 1989 to March 30, 1990. 



Jong Kung, Predoctoral Fellow, Brown University. "Study of Protocluster Using 

 Gas Dynamics," with Irwin Shapiro, from July 1, 1990 to June 30, 1991. 



Jerry LaSala, Visiting Scientist, Dartmouth College. "The Development of an 

 Integrated Software Package for the Analysis and classification of MK- 

 Dispersion Objective-Prism Spectra," with M. J. Kurtz, from February 2, 

 1990 to January 31, 1991. 



Peter Langhoff, Visiting Scientist, State University of New York. 



"Theoretical Atomic and Molecular Physics," with Alexander Dalgarno, 

 from May 1 to November 30, 1990. 



Weihong Liu, Predoctoral Fellow, Peking University. "The Physical and 



Chemical Processes in Astronomical Objects," with Irwin Shapiro, from 

 October 1, 1989 to September 30, 1991. 



Alan Marscher, Visiting Scientist, University of Virginia. "VLBI and X-Ray 

 Observations of Quasars and Theoretical Work on the Gas Dynamics and 

 Radiation of Relativistic Jets," with James Moran, from August 1, 1990 

 to July 31, 1991. 



Pablo Mauas, Visiting Scientist, Universidad Nacional de Buenos Aires. "The 



Study of the Solar Chromosphere, Especially its Energetic Balance," with 

 Eugene Avrett, from December 1, 1989 to September 30, 1990. 



Peter Meszaros, Visiting Scientist, University of California, Berkeley. 



"Neutron Star High Energy Properties and the Cosmic X-Ray Background 

 Radiation," with George Field, from September 1 to December 31, 1990. 



David Micha, Visiting Scientist, University of Uppsala, Sweden. "Theoretical 

 Atomic and Molecular Physics," with Alexander Dalgarno, from August 1 to 

 December 31, 1990. 



57 



