Abstract: Different compositions of layers forming a non-homogeneous explosive charge are selected so as to produce in response to underwater detonation of s explosive charge a gas bubble having a corresponding internal density distribution of explosion products to predetermine shape and direction of a water jet emerging from such bubble during collapse thereof for enhanced impact damage to an adjacent underwater target.

Abstract: A solid state shutter for blocking EMP is disclosed. The shutter includes thin films of amorphous semiconductor material fro the Group V or VI elements deposited on a silicon dioxide substrate. An antenna senses incident EMP causing a trigger circuit to apply a voltage across the thin films. The thin films switch from a state of high resistance to a state of low resistance for blocking passage of the EMP.

Abstract: A method of studying steady and unsteady supersonic gas flow using a two layer hydraulic analogy technique. The method simulates the specific heat ratio of the gas. Two layers of immiscible liquids having different densities and thicknesses are held in a shallow container. The densities are chosen and the layer thicknesses are adjusted to simulate the specific heat ratio of the gas. A model of a device to be studied is submerged in the liquid. Relative flow is caused to occur between the model and liquid simulating steady flow. The depth of the lower layer during the period of relative flow is measured and is analogous to steady state gas flow characteristics. For studying unsteady flow two bodies of liquids each having two layers of liquids of densities chosen, and lower layer thicknesses adjusted to simulate the specific heat ratio of the gas and to simulate a high and low pressure across a gas system, are held in a container separated by a removable gate.