Inverse problems in wave propagation occur in geophysics, ocean acoustics, civil and environmental engineering, ultrasonic non-destructive testing, biomedical ultrasonics, radar, astrophysics, as well as other areas of science and technology. The papers in this volume cover these scientific and technical topics, together with fundamental mathematical investigations of the relation between waves and scatterers.

Academic analysis has not always kept pace with the dramatic changes that have occurred in the USSR since Stalin's time, for objective study has often been overshadowed-especially in the 1980s-by publicity concerning the negative aspects of the "Evil Empire." Recently, however, because of reforms initiated by Gorbachev, the dynamics of the Soviet system have come into sharper focus. This book provides a wide-ranging, detailed view of economic, social, ideological, and literary aspects of the Soviet system leading up to the Gorbachev era. The essays include both historical and contemporary perspectives on the sources of stability (and stagnation) in the post-Stalin years. Examining the intricate fabric of Soviet society, the contributors provide insights into the social and cultural motivations for Gorbachev's "restructuring" policies. Their themes echo the work of Vera S. Dunham, who for more than four decades has focused on diverse aspects of Soviet society and culture, particularly on the noncoercive means of social control that have often been overlooked but that are a vital component of the Soviet system.

Academic analysis has not always kept pace with the dramatic changes that have occurred in the USSR since Stalin's time, for objective study has often been overshadowed-especially in the 1980s-by publicity concerning the negative aspects of the "Evil Empire." Recently, however, because of reforms initiated by Gorbachev, the dynamics of the Soviet system have come into sharper focus. This book provides a wide-ranging, detailed view of economic, social, ideological, and literary aspects of the Soviet system leading up to the Gorbachev era. The essays include both historical and contemporary perspectives on the sources of stability (and stagnation) in the post-Stalin years. Examining the intricate fabric of Soviet society, the contributors provide insights into the social and cultural motivations for Gorbachev's "restructuring" policies. Their themes echo the work of Vera S. Dunham, who for more than four decades has focused on diverse aspects of Soviet society and culture, particularly on the noncoercive means of social control that have often been overlooked but that are a vital component of the Soviet system.

The success over the years in reducing inflation and, consequently, the average level of nominal interest rates has increased the likelihood that the nominal policy interest rate may become constrained by the zero lower bound. When that happens, a central bank can no longer stimulate aggregate demand by further interest-rate reductions and must rely on "non-standard" policy alternatives. To assess the potential effectiveness of such policies, we analyze the behavior of selected asset prices over short periods surrounding central bank statements or other types of financial or economic news and estimate "noarbitrage" models of the term structure for the United States and Japan. There is some evidence that central bank communications can help to shape public expectations of future policy actions and that asset purchases in large volume by a central bank would be able to affect the price or yield of the targeted asset.