This report treats the problem of tracking and predicting the motion of a hostile submarine using adaptive planning for the positioning of passive sonobuoys. When four or more buoys are deployed in a favourable way, a position estimate and a confidence ellipse for the estimate are obtained at each time step. Using a Kalman filter the future position of the target is predicted. The uncertainty i...

The Met Office routinely runs a global spectral wave model providing analyses and forecasts of sea state on a grid spacing of approximately 60 km. The modelled two-dimensional wave energy spectra are compared with the Advanced Synthetic Aperture Radar (ASAR) Envisat satellite observations on a daily basis. Comparisons are also made with frequency ocean wave energy spectra observed by a moored b...

china is one of the oldest and most important countries in the world that has had an important role in the process of pottery production. especially chinese potters have had an inimitable skill in production of porcelain wares. although impress of chinese pottery on iran returns to the early periods after islam but during timurid and safavid periods this impress is more greater especially in ma...

iranian historiography during the safavid era affected by religious upheavals and intellectual and political developments, witnessed the emergence and evolution of a new approach towards time and techniques for recording history. the most important feature of this historiography was the continuance of pre-safavid models and regulations on the one hand, and the formation of typical safavid struc...

A design study has been made of a wave energy converter in the form of a heaving buoy reacting against an internal moving mass. Phase control has been obtained by modulating the stiffness of the spring governing the moving mass. Promising results, agreeing closely with linear theory, have been obtained with two shapes of buoy. Mean annual captures of the order of 2OOW/tonne in a typical South U...