We analyze the resolution of imaging functionals that migrate the cross correlation matrices of passive sensor arrays. These matrices are obtained by cross correlating signals emitted by ambient noise sources and recorded by the passive sensor array. They contain information about reflectors in the surrounding medium. Therefore, travel time or Kirchhoff migration of the cross correlations can, ...

This study aims at investigating the effects of cooperative language learning on learning active and passive structures among Iranian EFL students. The participants of the study were 60 high school students that were selected from third grade of Barikbin high school in Qazvin. All of the participants were male. Their level of proficiency was intermediate. Then the participants were divided into...

Nauclér, P. 2008. Estimation and Control of Resonant Systems with Stochastic Disturbances. Acta Universitatis Upsaliensis. Uppsala Dissertations from the Faculty of Science and Technology 74. 197 pp. Uppsala. ISBN 978-91-554-7187-3. The presence of vibration is an important problem in many engineering applications. Various passive techniques have traditionally been used in order to reduce waves...

This study arose from the need to control noise in naval vessels to reduce their detectability and hence vulnerability to enemy attack. In this report a detailed review of sensor and actuator technologies that could be used for active noise and vibration control in ship structures has been provided. The review focused on a wide range of sensor and actuator materials, such as piezoelectric and e...