October 1998 VOLUME 23 NUMBER 4 IJOEDY(ISSN 0364-9059)

NONTECHNICAL CONTENT
Front cover and table of contents
Back cover

PAPERS
Junhao Xie, Yeshu Yuan, and Yongtan Liu Super-resolution processing for HF surface wave radar based on pre-whitened MUSIC 313
Jong-Sen Lee, Robert W. Jansen, Dale L. Schuler, Thomas L. Ainsworth, George O. Marmorino, and Scott R. Chubb Polarimetric analysis and modeling of multifrequency SAR signatures from gulf stream fronts 322
Aleksandar Jeremic and Arye Nehorai Design of chemical sensor arrays for monitoring disposal sites on the ocean floor 334
Linda V. Martin Traykovski, Timothy K. Stanton, Peter H. Wiebe, and James F.  Lynch Model-based covariance mean variance classification techniques: Algorithm development and application to the acoustic classification of zooplankton 344
Stan E.  Dosso, Gary H. Brooke, Steven J. Kilistoff, Barbara J. Sotirin, Vincent K. McDonald, Mark R.  Fallat, and Nicole E. Collison High-precision array element localization for vertical line arrays in the arctic ocean 365
Nikitas V. Nikitakos, Assimakis K. Leros, and Sokratis K. Katsikas Towed array shape estimation using multimodel partitioning filters 380
C. D. Serdula and M. R. Loewen Experiments investigating the use of fiber-optic probes for measuring bubble-size distributions 385
Andy D. Phelps and Timothy G. Leighton Oceanic bubble population measurements using a buoy-deployed combination frequency technique 400
Anthony P. Lyons and Thomas H. Orsi The effect of a layer of varying density on high-frequency reflection, forward loss, and backscatter 411
Jorge C. Novarini, Richard S. Keiffer, and Guy V. Norton A model for variations in the range and depth dependence of the sound speed and attenuation induced by bubble clouds under wind-driven sea surfaces 423

TECHNICAL COMMUNICATIONS
Richard B.  Evans and William M. Carey Frequency dependence of sediment attenuation in two low-frequency shallow-water acoustic experimental data sets 439
Johan G. Lourens and Johan A. du Preez Passive sonar ML estimator for ship propeller speed 448