Abstract: A model of a software system under execution including: a representation of a first node corresponding to a first function executing in the software system which obtains access to a resource, with an indicator of a number of times the first function has been called in the software system; a representation of a second node corresponding to a second function executing in the software system while the resource is accessed, with an indicator of a number of times the second function has been called; a representation of a place holder node with an indicator that the place holder node has never been called in the software system; a representation of a first call from the first node to the place holder node; and a representation of a second call from the place holder node to the second node. The first and second calls correspond to the first function calling the second function in the software system.

Abstract: An acoustic projector with a thin walled shell extending between flanges having helicoidal corrugations extending between the flanges. A shear mode motor is coupled to the thin walled shell to provide a torque to the thin walled shell.

Abstract: An acoustic projector with a thin walled shell extending between flanges having helicoidal corrugations extending between the flanges. A shear mode motor is coupled to the thin walled shell to provide a torque to the thin walled shell.

Abstract: A model of a software system under execution including: a representation of a first node corresponding to a first function executing in the software system which obtains access to a resource, with an indicator of a number of times the first function has been called in the software system; a representation of a second node corresponding to a second function executing in the software system while the resource is accessed, with an indicator of a number of times the second function has been called; a representation of a place holder node with an indicator that the place holder node has never been called in the software system; a representation of a first call from the first node to the place holder node; and a representation of a second call from the place holder node to the second node. The first and second calls correspond to the first function calling the second function in the software system.

Abstract: An underwater acoustic projector comprising a pair of spaced apart end plates with an acoustic driver positioned between the end plates, the driver having smaller cross-sectional dimensions than the end plates. Each end plate close one end of an open ended tubular pipe waveguide and that plate is mechanically connected to one end of a piezoelectric drive unit with a tubular waveguide extending inwards and surrounding the end portion of the acoustic driver.

Abstract: An underwater acoustic projector comprising a pair of spaced apart end walls with an acoustic driver positioned between the end walls, the driver having smaller cross-sectional dimensions than the end walls. The projector has a one piece thin wall inwardly concavely shaped shell with corrugations running in the axial direction surrounding the driver and mechanically coupled to the end walls. An open ended tubular waveguide (pipe) is connected to each end wall of the projector and extend outward forming a flextensional resonant pipe projector.

Abstract: An underwater acoustic projector comprising a pair of spaced apart end walls with an acoustic driver positioned between the end walls, the driver having smaller cross-sectional dimensions than the end walls. Each end wall close one end of flared open ended pipe waveguides and is mechanically coupled to one end of a piezoelectric acoustic driver. The flared pipe waveguides extend outward from the driver and have a larger diameter at their open ends than at the end walls.

Abstract: An underwater acoustic projector comprising a pair of spaced apart end plates with an acoustic driver positioned between the end plates, the driver having smaller cross-sectional dimensions than the end plates. The end plate's edges are secured to an outer one-piece thin walled shell that provides a waterproof enclosure for the driver. That thin walled shell has a concavely inwardly bent surface between the end plates and a plurality of axially extending corrugations to provide a predetermined axial compliance and radial-to-axial transformation ratio.