Abstract: An active non-lethal infrasound system for denying all bird species access to critical areas, particularly in areas around aircraft and other high value systems. The system comprises a plurality of infrasound generators broadcasting continuous infrasonic signals to create a bird-free infrasound active zone within the perimeters of the protected critical area and an infrasound-free dead zones for birds being denied access to the critical areas. Further, an active infrasonic barrier is assembled within an exclusion area surrounding the bird-free infrasound active zone to dampen all low frequency sound waves emanating from the critical area and its perimeters. Wherever the situation allows, a wildlife sanctuary is preferably established further from the exclusion area to attract and protect birds, enforced by broadcasting infrasound signals that simulate natural sounds that attract species typical of the geographic location.

Abstract: A method is provided for mitigation of aircraft bird strikes through the provision of conditions on the ground that totally prevents the formation of atmospheric thermals in the proximity of airports and airfields, whereby conflicts between soaring and migratory birds and aircrafts may be avoided. This is accomplished by modification of the topography of the field into a plurality of zones, as described herein and through construction of high albedo pavements, roads, artificial turfs and cool terrains.

Abstract: A method is provided for mitigation of aircraft bird strikes through the provision of conditions on the ground that totally prevents the formation of atmospheric thermals in the proximity of airports and airfields, whereby conflicts between soaring and migratory birds and aircrafts may be avoided. This is accomplished by modification of the topography of the field into a plurality of zones, as described herein and through construction of high albedo pavements, roads, artificial turfs and cool terrains.

Abstract: A method is provided for mitigation of aircraft bird strikes through the provision of conditions on the ground that totally prevents the formation of atmospheric thermals in the proximity of airports and airfields, whereby conflicts between soaring and migratory birds and aircrafts may be avoided. This is accomplished by modification of the topography of the field into a plurality of zones, as described herein and through construction of high albedo pavements, roads, artificial turfs and cool terrains.

Abstract: An active non-lethal infrasound system for denying all bird species access to critical areas, particularly in areas around aircraft and other high value systems. The system comprises a plurality of infrasound generators broadcasting continuous infrasonic signals to create a bird-free infrasound active zone within the perimeters of the protected critical area and an infrasound-free dead zones for birds being denied access to the critical areas. Further, an active infrasonic barrier is assembled within an exclusion area surrounding the bird-free infrasound active zone to dampen all low frequency sound waves emanating from the critical area and its perimeters. Wherever the situation allows, a wildlife sanctuary is preferably established further from the exclusion area to attract and protect birds, enforced by broadcasting infrasound signals that simulate natural sounds that attract species typical of the geographic location.

Abstract: A method is provided for mitigation of aircraft bird strikes through the provision of conditions on the ground that totally prevents the formation of atmospheric thermals in the proximity of airports and airfields, whereby conflicts between soaring and migratory birds and aircrafts may be avoided. This is accomplished by modification of the topography of the field into a plurality of zones, as described herein and through construction of high albedo pavements, roads, artificial turfs and cool terrains.

Abstract: An active non-lethal infrasound system for denying all bird species access to critical areas, particularly in areas around aircraft and other high value systems. The system comprises a plurality of infrasound generators broadcasting continuous infrasonic signals to create a bird-free infrasound active zone within the perimeters of the protected critical area and an infrasound-free dead zones for birds being denied access to the critical areas. Further, an active infrasonic barrier is assembled within an exclusion area surrounding the bird-free infrasound active zone to dampen all low frequency sound waves emanating from the critical area and its perimeters. Wherever the situation allows, a wildlife sanctuary is preferably established further from the exclusion area to attract and protect birds, enforced by broadcasting infrasound signals that simulate natural sounds that attract species typical of the geographic location.

Abstract: A loudspeaker, and particularly, a woofer, including a flat diaphragm transducer having at least one stator plate for carrying magnetic elements in close proximity to a low stiffness diaphragm wherein a piston-like motion of the diaphragm is achieved by creating pressure zones adjacent the diaphragm to improve an acoustic coupling and increase acoustic output for a given size of diaphragm by the provision of non-uniformly spaced openings in the at least one stator plate which are selectively spaced to control low frequency diaphragm resonance modes.

Abstract: A planar magnetic acoustical transducer including a diaphragm with electrical circuit carrying conductors having a width substantially equal to a combined width of a plurality of magnetic fields created by equally spaced opposing rows of permanent magnets carried by opposing frame sections between which the diaphragm is mounted such that substantially the entire active area of the diaphragm is driven to create a smooth frequency response. The electrical circuit includes generally parallel segments which are aligned within the magnetic fields created by the rows of opposing magnets and are spaced at a distance relative to one another generally not less than a distance equal to a width of pole elements which are integrally formed with the frame sections and which pole elements are spaced intermediate each of the rows of magnets so as to be in an opposing relationship with one another on opposite sides of the diaphragm.

Abstract: Diaphragms of planar magnetic transducers having electrical conductor runs applied thereto are deformed to create lines of flexation such as by knurling, pressing, embossing or the like prior to being placed under tension within a support frame so as to reduce loss of diaphragm tension and thereby control resonance modes along active surface areas of the diaphragm when electrical energy is applied through the conductor runs.