North-finder is perfect orientation equipment for position launching in stratagem, tactic and battle, which can provide azimuth benchmark for missile, radar, canon, fish torpedo, airplane, naval vessel and vehicle.
Their cross sectional distribution patterns in relation to the river channel morphologies were examined by using ship-mounted ADCP (Acoustic Doppler Current Profiler) instrument.
The launching of such a ship into an Earth orbit or beyond by a large nuclear explosion in an underground cavity is sketched out in the second section of the paper, and finally we consider a hypothetical Mars mission based on these concepts.
In the three-dimen-sional problem the case is studied when the normal stress is concentrated on a segment of a straight line of length 2l, which can replace a ship moving along a straight course with the constant velocity U.
Development of ship waves in a liquid of finite depth
Development of ship waves in a nonhomogeneous liquid
Analytical method of capsizing probability in the time domain for ships in the random beam seas
The methods for constructing safe basins of ships and predicting their survival probability in random waves were studied.
The nonlinear differential equation of the rolling motion of ships in random beam seas was established considering nonlinear damping, nonlinear restoring moment, and random waves.
The random rolling differential equation was solved in the time domain by applying the harmonic acceleration method and by synthetically considering the instantaneous state of ships and the narrowband wave energy spectrum.
The numerical simulation of random capsizing course was brought forward, the safe basins were constructed for safe navigation, and the survival probabilities of ships were calculated.