TY  - JOUR
A1  - Chang, C 
A1  - Liu, Q 
T1  - Inversion of source-time functions using borehole array sonic waveforms.
Y1  - 1998/06/
N1  - R825225
JF  - JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
J1  - J ACOUST SOC AM
VL  - 103
IS  - 6
SP  - 3163
EP  - 3168
PB  - Acoustical Society of America
ER  - 


TY  - JOUR
A1  - Chen, Y 
A1  - Chew, W C
A1  - Liu, Q 
T1  - A three-dimensional finite difference code for the modeling of sonic logging tools.
Y1  - 1998/02/
N1  - R825225
JF  - JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
J1  - J ACOUST SOC AM
VL  - 103
IS  - 2
SP  - 702
EP  - 712
PB  - Acoustical Society of America
ER  - 


TY  - JOUR
A1  - Fan, G-X 
A1  - Liu, Q H
T1  - A PML-FDTD algorithm for simulating plasma-covered cavity-backed slot antennas.
Y1  - 1998/11/
N1  - R825225
JF  - MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
J1  - MICROW OPT TECHN LET
VL  - 19
IS  - 4
SP  - 258
EP  - 262
PB  - John Wiley and Sons
ER  - 


TY  - JOUR
A1  - Liu, Q H
T1  - An FDTD algorithm with perfectly matched layers for conductive media.
Y1  - 1997/02/05
N1  - R825225
JF  - MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
J1  - MICROW OPT TECHN LET
VL  - 14
IS  - 2
SP  - 134
EP  - 137
PB  - John Wiley and Sons
ER  - 


TY  - JOUR
A1  - Liu, Q H
T1  - The PSTD algorithm: a time-domain method requiring only two cells per wavelength.
Y1  - 1997//
N1  - R825225
JF  - MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
J1  - MICROW OPT TECHN LET
VL  - 15
IS  - 3
SP  - 158
EP  - 165
PB  - John Wiley and Sons
ER  - 


TY  - JOUR
A1  - Liu, Q H
A1  - Tao, J 
T1  - The perfectly matched layer (PML) for acoustic waves in absorptive media.
Y1  - 1997//
N1  - R825225
JF  - JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
J1  - J ACOUST SOC AM
VL  - 102
IS  - 4
SP  - 2072
EP  - 2082
PB  - Acoustical Society of America
ER  - 


TY  - JOUR
A1  - Liu, Q H
A1  - Nguyen, N 
T1  - An accurate algorithm for nonuniform fast Fourier transforms (NUFFT's).
Y1  - 1998/01/
N1  - R825225
JF  - IEEE TRANSACTIONS ON MICROWAVE AND GUIDED WAVE LETTERS
VL  - 8
IS  - 1
SP  - 18
EP  - 20
PB  - IEEE
ER  - 


TY  - JOUR
A1  - Liu, Q H
T1  - The pseudospectral time-domain (PSTD) algorithm for acoustic waves in absorptive media.
Y1  - 1998/07/
N1  - R825225
JF  - IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL
VL  - 45
IS  - 4
SP  - 1044
EP  - 1055
ER  - 


TY  - JOUR
A1  - Liu, Q H
A1  - He, J Q
T1  - Quasi-PML for waves in cylindrical coordinates.
Y1  - 1998/10/05
N1  - R825225
JF  - MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
J1  - MICROW OPT TECHN LET
VL  - 19
IS  - 2
SP  - 107
EP  - 111
PB  - John Wiley and Sons
ER  - 


TY  - JOUR
A1  - Liu, Q H
A1  - Tang, X Y
T1  - Iterative algorithm for nonuniform inverse fast Fourier transform (NU- IFFT).
Y1  - 1998/10/1
N1  - R825225
JF  - ELECTRONICS LETTERS
J1  - ELECTRON LETT
VL  - 34
IS  - 20
SP  - 1913
EP  - 1914
ER  - 


TY  - JOUR
A1  - Liu, Q H
T1  - Some current trends in numerical methods for transient acoustic and elastic waves in multidimensional inhomogeneous media.
Y1  - 1998//
N1  - R825225
JF  - CURRENT TOPICS IN ACOUSTICAL RESEARCH
VL  - 2
SP  - 31
EP  - 42
ER  - 


TY  - JOUR
A1  - Nguyen, N 
A1  - Liu, Q H
T1  - The regular Fourier matrices and nonuniform fast-Fourier transforms.
Y1  - 1999//
N1  - R825225
JF  - SIAM JOURNAL OF SCIENTIFIC COMPUTING
VL  - 21
IS  - 1
SP  - 283
EP  - 293
ER  -