Abstract: Devices and a method for releasing gas in a container after closing and sealing to pressurize and/or prevent or counteract buckling thereof, and or provide structural rigidity and strength thereto and or release components. The method introduces a reactive agent into the container after filling and before sealing. The reactive agent is controlled to react to provide a gas and optionally components, which a) provides a positive pressure to prevent or counteract buckling and provide structural rigidity to the container, and b) and or changes the state or characteristics of the headspace and or contents of the closed container. The devices include a closure, a cap and a container. The reactive agent is brought to chemical reaction by moistening, heating, catalyst and the like. The closure includes the reactive agent and is disposed in the container. The external trigger is a device that emits energy that provides heat to the reactive agent to stimulate the chemical reaction.

Abstract: A method of manufacturing a sonar projector is disclosed. The method comprises the steps of: bonding a flat piezo-ceramic plate to a flexible conducting sheet; dicing the plate to form an assembly comprising a matrix of piezo-ceramic pegs bonded to the flexible conducting sheet, the pegs being separated by kerfs; bending the assembly to a predetermined curvature, thereby expanding the kerfs; filling the expanded kerfs with a filler material; and applying conductive material to the exposed surfaces of the pegs, such that the conductive material and the flexible conducting sheet in combination form electrodes operable to apply a voltage to the piezo-ceramic pegs. Methods of manufacturing a curved piezo-ceramic structure are also disclosed.

Abstract: Improved sonar baffles and backings are disclosed. The sonar baffles and backings include a porous polymer. The baffles and backings can be produced by partial selective sintering of a polyamide powder. Baffles and backings in accordance with exemplary embodiments exhibit advantageous acoustic properties, and can be manufactured to complex geometric specifications without difficulty.

Abstract: A method of manufacturing a sonar projector is disclosed. The method comprises the steps of: bonding a flat piezo-ceramic plate to a flexible conducting sheet; dicing the plate to form an assembly comprising a matrix of piezo-ceramic pegs bonded to the flexible conducting sheet, the pegs being separated by kerfs; bending the assembly to a predetermined curvature, thereby expanding the kerfs; filling the expanded kerfs with a filler material; and applying conductive material to the exposed surfaces of the pegs, such that the conductive material and the flexible conducting sheet in combination form electrodes operable to apply a voltage to the piezo-ceramic pegs. Methods of manufacturing a curved piezo-ceramic structure are also disclosed.

Abstract: Devices and a method for releasing gas in a container after closing and sealing to pressurize and/or prevent or counteract buckling thereof, and or provide structural rigidity and strength thereto and or release components. The method introduces a reactive agent into the container after filling and before sealing. The reactive agent is controlled to react to provide a gas and optionally components, which a) provides a positive pressure to prevent or counteract buckling and provide structural rigidity to the container, and b) and or changes the state or characteristics of the headspace and or contents of the closed container. The devices include a closure, a cap and a container. The reactive agent is brought to chemical reaction by moistening, heating, catalyst and the like. The closure includes the reactive agent and is disposed in the container. The external trigger is a device that emits energy that provides heat to the reactive agent to stimulate the chemical reaction.

Abstract: Devices and a method for releasing gas in a container after closing and sealing to pressurize and/or prevent or counteract buckling thereof, and or provide structural rigidity and strength thereto and or release components. The method introduces a reactive agent into the container after filling and before sealing. The reactive agent is controlled to react to provide a gas and optionally components, which a) provides a positive pressure to prevent or counteract buckling and provide structural rigidity to the container, and b) and or changes the state or characteristics of the headspace and or contents of the closed container. The devices include a closure, a cap and a container. The reactive agent is brought to chemical reaction by moistening, heating, catalyst and the like. The closure includes the reactive agent and is disposed in the container. The external trigger is a device that emits energy that provides heat to the reactive agent to stimulate the chemical reaction.

Abstract: Devices and a method for releasing gas in a container after closing and sealing to pressurize and/or prevent or counteract buckling thereof, and or provide structural rigidity and strength thereto and or release components. The method introduces a reactive agent into the container after filling and before sealing. The reactive agent is controlled to react to provide a gas and optionally components, which a) provides a positive pressure to prevent or counteract buckling and provide structural rigidity to the container, and b) and or changes the state or characteristics of the headspace and or contents of the closed container. The devices include a closure, a cap and a container. The reactive agent is brought to chemical reaction by moistening, heating, catalyst and the like. The closure includes the reactive agent and is disposed in the container. The external trigger is a device that emits energy that provides heat to the reactive agent to stimulate the chemical reaction.

Abstract: Devices and a method for releasing gas in a container after closing and sealing to pressurize and/or prevent or counteract buckling thereof, and or provide structural rigidity and strength thereto and or release components. The method introduces a reactive agent into the container after filling and before sealing. The reactive agent is controlled to react to provide a gas and optionally components, which a) provides a positive pressure to prevent or counteract buckling and provide structural rigidity to the container and b) and or changes the state or characteristics of the headspace and or contents of the closed container. The devices include a closure, a cap and a container. The reactive agent is brought to chemical reaction by moistening, heating, catalyst and the like. The closure includes the reactive agent and is disposed in the container. The external trigger is a device that emits energy that provides heat to the reactive agent to stimulate the chemical reaction.