Abstract: An example method for electrical stimulation of a subject includes creating multiple circuits using implantable electrodes positioned in the subject, transmitting a signal of a first frequency through a first circuit of the multiple circuits and the first circuit generates a first electrical field, and transmitting a signal of a second frequency through a second circuit of the multiple circuits and the second circuit generates a second electrical field. The implantable electrodes are positioned in a substantially linear configuration along a same axis such that the first electrical field and the second electrical field are in an axial bias configuration, and the first electrical field and the second electrical field interfere with each other at an area of overlap to produce a beat signal.

Abstract: Disclosed embodiments relate to devices and related methods for delivering a composition to a subject. In some embodiments, a device may include a catheter coupled to a handle. The handle may include proximal and distal handle portions that are moveable relative to one another to selectively expose a needle at a distal end of the catheter. The proximal handle portion may include a container coupling and a grip extending proximally from the container coupling.

Abstract: Disclosed embodiments relate to devices and related methods for delivering a composition to a subject. In some embodiments, a device may include a catheter coupled to a handle. The handle may include proximal and distal handle portions that are moveable relative to one another to selectively expose a needle at a distal end of the catheter. The proximal handle portion may include a container coupling and a grip extending proximally from the container coupling.

Abstract: Various aspects described herein relate to compositions comprising silk fibroin particles and methods of using the same, as well as devices and methods of delivering such compositions. The compositions described herein are suitable for injection into a site of defect in a soft tissue to provide bulking and/or augmentation effect to the soft tissue.

Abstract: Various aspects described herein relate to compositions comprising silk fibroin particles and methods of using the same, as well as devices and methods of delivering such compositions. The compositions described herein are suitable for injection into a site of defect in a soft tissue to provide bulking and/or augmentation effect to the soft tissue.

Abstract: Various aspects described herein relate to compositions comprising silk fibroin particles and methods of using the same, as well as devices and methods of delivering such compositions. The compositions described herein are suitable for injection into a site of defect in a soft tissue to provide bulking and/or augmentation effect to the soft tissue.

Abstract: Various aspects described herein relate to compositions comprising silk fibroin particles and methods of using the same, as well as devices and methods of delivering such compositions. The compositions described herein are suitable for injection into a site of defect in a soft tissue to provide bulking and/or augmentation effect to the soft tissue.

Abstract: Various aspects described herein relate to compositions comprising silk fibroin particles and methods of using the same, as well as devices and methods of delivering such compositions. The compositions described herein are suitable for injection into a site of defect in a soft tissue to provide bulking and/or augmentation effect to the soft tissue.

Abstract: Systems and method are provided for using chaotic signals for low probability of detection (LPD) communications. Embodiments of the present disclosure provide systems and methods for synchronizing chaotic systems and then encoding information on a signal in a way that produces little or no signature (e.g., using a bit flipping technique or a chaos control encoding technique). Systems and methods in accordance with embodiments of the present disclosure can work with noise larger than the signal, so they are suitable for communication in noisy environments.

Abstract: Disclosed embodiments relate to devices and related methods for delivering a composition to a subject. In some embodiments, a device may include a catheter coupled to a handle. The handle may include proximal and distal handle portions that are moveable relative to one another to selectively expose a needle at a distal end of the catheter. The proximal handle portion may include a container coupling and a grip extending proximally from the container coupling.

Abstract: Various aspects described herein relate to compositions comprising silk fibroin particles and methods of using the same, as well as devices and methods of delivering such compositions. The compositions described herein are suitable for injection into a site of defect in a soft tissue to provide bulking and/or augmentation effect to the soft tissue.

Abstract: Systems and method are provided for using chaotic signals for low probability of detection (LPD) communications. Embodiments of the present disclosure provide systems and methods for synchronizing chaotic systems and then encoding information on a signal in a way that produces little or no signature (e.g., using a bit flipping technique or a chaos control encoding technique). Systems and methods in accordance with embodiments of the present disclosure can work with noise larger than the signal, so they are suitable for communication in noisy environments.

Abstract: A system and method is provided for estimating a trajectory of an incoming bullet based on the acoustics of the shock wave created as the bullet travels through the air. A first auditory signal representing a direct sound from the shock wave is recorded and its azimuthal direction is determined. Based on this azimuthal direction and other assumptions two possible bullet directions that can cause that shock wave are estimated. A second auditory signal representing a reflection of the shock wave as it travels through the air also is recorded and its azimuthal direction determined. The azimuthal direction of the ground reflection will lie between the azimuthal direction of the first auditory signal and the more correct of the two estimated trajectories, and thus can resolve the ambiguity in the estimated direction of the bullet source.

Abstract: The low-interference communications device uses chaotic signals which are almost periodic. A chaotic circuit driven by a sine wave signal from a function generator is produced which has narrow-band features in the power spectrum. An information signal is encoded on the chaotic signal by modulating the phase of the sine wave that drives the chaotic circuit. Periodic (narrow-band) components are then removed from the chaotic signal and the chaotic signal is transmitted to a receiver device. The chaotic signal is nonlinear, so the narrow band and broad band parts of the chaotic signal have been modulated together. The transmitted signal is relatively flat, so it will not interfere with other communications signals. At the receiver, the nonlinear chaotic signal is restored by performing a nonlinear operation on the received signal, such as squaring or cubing, to remove the narrowband components. Then the information modulated onto the narrow band component is detected.

Abstract: A signal generator and signal receiver, as well as method of signal generation and transmission, in which selected unstable periodic orbits of a lossy chaotic system are identified and extracted, and portions of the orbits concatenated together to form a resultant signal. The selected orbits are known to the signal detector a priori. The signal detector detects the transmitted signal by correlation of the received signal with the known extracted orbits, also allowing the detector identify information which the generator imposed onto the signal.

Abstract: The low-interference communications device uses chaotic signals which are almost periodic. A chaotic circuit driven by a sine wave signal from a function generator is produced which has narrow-band features in the power spectrum. An information signal is encoded on the chaotic signal by modulating the phase of the sine wave that drives the chaotic circuit. Periodic (narrow-band) components are then removed from the chaotic signal and the chaotic signal is transmitted to a receiver device. The chaotic signal is nonlinear, so the narrow band and broad band parts of the chaotic signal have been modulated together. The transmitted signal is relatively flat, so it will not interfere with other communications signals. At the receiver, the nonlinear chaotic signal is restored by performing a nonlinear operation on the received signal, such as squaring or cubing, to remove the narrowband components. Then the information modulated onto the narrow band component is detected.

Abstract: A system for synchronizing chaotic transmitters and receivers that is less sensitive to channel effects than other known chaotic communication methods. The system employs duplicate transmitter and receiving modules and in addition to the chaotic output a synchronizing signal which occupies a reduced bandwidth. The small bandwidth affords the system a greater resistance to the affects of frequency dependent channel distortion and noise. The broad band chaotic signal is transmitted and appears to be noise to an unauthorized listener. The receiving unit employs band pass filtering, and when the signal is received the receiver filters the chaotic signal through band pass filters which eliminate channel noise and make gain control easier to implement.

Abstract: An amplitude insensitive synchronized nonlinear system (AISN) that allows communication between nonlinear systems operating in the chaotic realm which is insensitive to attenuation or signal noise affecting the amplitude of the drive signal, thereby allowing communication between remote systems where the amplitude of the transmitted signal has been varied by an unknown amount.

Abstract: A filtered cascaded synchronized nonlinear system includes a nonlinear transmitter having stable first and second subsystems. The first subsystem produces a first transmitter signal for driving the second subsystem, and the second subsystem produces a second transmitter signal for driving the first subsystem. A first filter filters the second transmitter signal to produce a filter output signal. A subtractor subtracts the filter output signal from the second transmitter signal to produce a transmitter output signal which is transmitted to a nonlinear cascaded receiver. The receiver includes an adder for summing the received transmitter output signal with a receiver filter output signal to restore frequencies that were subtracted from the second transmitter signal in order to produce a first receiver drive signal. The receiver includes cascaded third and fourth subsystems that are respective duplicates of the first and second subsystems.

Abstract: A cascaded synchronized system includes a nonlinear transmitter, a nonlinear cascaded receiver, a phase-detector/controller coupled to the receiver, and a signal generator also coupled to the receiver. The transmitter is responsive to an externally generated transmitter forcing signal for producing and transmitting a chaotic communications signal containing phase information. The cascaded receiver is responsive to a receiver forcing signal and to the chaotic communications signal for producing a chaotic receiver output signal containing phase information. The phase-detector/controller is responsive to the chaotic communications signal and to the receiver output signal for producing a correction signal. The signal generator is responsive to the correction signal for producing the receiver forcing signal in phase with and having the same frequency as the transmitter forcing signal.