Abstract: The present invention discloses a braided reinforced tearaway sheath structure and a manufacturing method thereof, comprising a sheath body. The sheath body includes a sleeve portion and a guiding insertion portion provided at the head end of the sleeve portion. A connector is provided at the tail end of the sleeve portion. The sleeve portion includes an inner layer tube, a braided tube, and an outer layer tube sequentially arranged from the inside to the outside. The sheath body is provided with a plurality of tear grooves along the length direction, and both ends of each tear groove extend to both ends of the sheath body, and the sheath body is further sealed and wrapped with at least one layer of tearable film. It has the effect of improving the strength of the tearaway sheath structure and making the tearing process of the tearaway sheath safer.

Abstract: Disclosed herein are examples of acoustic reflecting nets that include resonator strands having a resonance frequency based on a height of a channel disposed along a length of the resonator strands.

Abstract: The present disclosure discloses a hydrogen generator. The hydrogen generator includes a housing, and an electrolyzer, an electrolyte tank, a gas-liquid separator, and a purification apparatus mounted in the housing. A diaphragm of the electrolyzer is an anion-exchange membrane. The electrolyzer is in communication with the electrolyte tank through a pipeline. The gas-liquid separator is provided with a first gas inlet and a third gas outlet. The first gas inlet is in communication with a first gas outlet of the electrolyzer through a pipeline. The purification apparatus is provided with a second gas inlet. The third gas outlet is in communication with the second gas inlet through a pipeline.

Abstract: Disclosed herein are sound direction sensor-based acoustic cameras and related systems and methods. In one example, a system comprising a memory having instructions that, when executed by a processor, causes the processor to display on a display device a source location of an acoustic wave on an image captured by a camera sensor using information from capacitively coupled circuits that are in communication with transducers disposed adjacent to the camera sensor.

Abstract: A sensor includes a tweezer source configured to manipulate a defect nanoparticle in a liquid to a desired position in an enclosure containing the liquid and a light source configured to optically excite the defect nanoparticle in the liquid at the desired position. The sensor also includes a radio frequency (RF) excitation source configured to RF excite the defect nanoparticle in the liquid at the desired position and an optical detector configured to receive an optical signal emitted from the optically excited defect nanoparticle.

Abstract: A detachable and replaceable connector base structure for a lithium-ion power tool battery pack, comprising a housing and a circuit board provided at the bottom of the housing; the bottom of the housing is provided with a connector base on which a battery pack is mounted, the connector base is detachably connected to the housing, and a positioning and fixing structure is provided between a side of the connector base and the housing to form a detachable fixed connection between the connector base and the housing; the battery pack is provided with a buckle structure that cooperates with the connector base, and the connector base is further provided with a plurality of conductive inserts. The connector base is detachably connected to the housing of the lithium battery tool in a separable manner, while the battery pack is connected to the housing through the connector base.

Abstract: An interventional delivery device for a heart valve prosthesis, and a threading member of the delivery device. The interventional delivery device for the heart valve prosthesis comprises: an outer tube; an inner tube located in the outer tube; a threading member provided on the inner tube, the threading member being provided with a threading hole and a positioning portion; a suture end positioning member, one end of the suture end positioning member being detachably positioned in the positioning portion of the threading member; and a traction member, one end of the traction member passing through the threading hole to be connected to a heart valve prosthesis and to be connected to the suture end positioning member, and the other end of the traction member extending out of the outer tube.

Abstract: A detachable and replaceable connector base structure for a lithium-ion power tool battery pack includes a housing with a detachable connector base at its bottom. A positioning structure between the base and the housing secures the base in place while permitting removal, and a buckle mechanism on the battery pack locks the battery pack to the base. Conductive inserts in the base provide electrical connection to the tool's circuitry. This design allows the power tool to interchangeably use battery packs of different brands or models without requiring any modification to the tool housing.

Abstract: Systems, methods, and other embodiments described herein relate to determining a location of a sound source and providing feedback of the location to a user. In one embodiment, a method includes determining, via a sound localization system disposed on a frame to be worn on a head of a user, an azimuth angle and an elevation angle of a sound source. The sound localization system includes 1) an array of transducers, 2) a feedback system, and 3) a capacitively coupled circuit per transducer pair. The method also includes generating, via the feedback system, feedback to indicate a location of the sound source relative to a center point of a transparent display surface of the frame.

Abstract: Systems for determining the direction of acoustic waves are described herein. In one example, a system for determining the direction of an acoustic wave includes a capacitively coupled circuit having a first circuit and a second circuit, a first transducer connected to the first circuit, and a second transducer connected to the second circuit. The system may include a memory in communication with a processor and having instructions that, when executed by the processor, cause the processor to determine the direction of an acoustic wave detected by the first and second transducers using a first voltage from the first circuit and a second voltage from the second circuit.

Abstract: An improved locking/unlocking structure for a nailing gun’s locking block includes a power box, a striking pin, and multiple teeth formed on one side of the pin, with a catch slot on the other side. A fixed pivot shaft on the power box supports a rotatable locking block that engages or disengages the slot. A tension spring biases the block toward a locked mode. A drive motor beneath the box drives a cam connected via a synchronization shaft, a support seat, and a lever, restricting the block’s rotation. Elevating or lowering the lever locks or unlocks the block. After 150,000 locking/unlocking cycles, minimal wear is observed, maintaining the gun’s performance and durability. This design significantly improves reliability compared to conventional mechanisms, as repeated operation does not compromise essential functionality or reduce the efficiency of nailing operations. The structure is easily adaptable to various nailing gun models and environments.

Abstract: A supramolecule compound, a two-dimensional rare earth oxysalt, and a preparation method therefor are provided. By utilizing a series of ?-conjugated planar supramolecule compounds as synthesis templates, a variety of novel two-dimensional rare earth oxysalts can be produced. By carefully fine-tuning the properties of the supramolecule compound template, along with the types of oxoanion and organic amine, it is possible to effectively and precisely obtain two-dimensional rare earth oxysalts with diverse structures. This template-based synthesis strategy, leveraging supramolecule compounds, is highly versatile and applicable to all rare earth elements. It enables the preparation of two-dimensional rare earth oxysalts with uniform structures, containing either a single rare earth element or multiple elements, and allows for precise control over the material's properties.

Abstract: Provided are a direction of arrival (DOA) estimation method and system for a sparse array based on Vandermonde decomposition reconstruction, relating to the technical field of array signal processing. The method includes: constructing a covariance matrix completion optimization model based on sparse array signals and uniform linear array signals, and performing Vandermonde decomposition by using characteristics of a uniform linear array; introducing a nuclear norm to optimize a rank function in the model, and updating the covariance matrix completion optimization model; and introducing an auxiliary variable to transform the model into a solvable optimization problem, and solving the problem by an alternating direction multiplier method to obtain an optimal estimation value. The DOA is estimated using a root multiple signal classification algorithm.

Abstract: Systems for directional surface acoustic wave transmission are disclosed herein. In one example, a system includes a transmitter configured to transmit a surface acoustic wave and a receiver configured to receive the surface acoustic wave. A resonant structure may be disposed on the surface of a substrate between the transmitter and receiver and is configured to allow the surface acoustic wave to propagate through the resonant structure towards the receiver and limit a reflection of the surface acoustic wave to propagate through the resonant structure towards the transmitter.

Abstract: An energy harvesting system capable of using vibrational or mechanical energy to direct energy along a line to an energy receiver to transfer the vibrational energy. The energy harvesting system includes an energy transmitter capable of turning rotational or vibrational energy into a linear vibration that travels along the line to an energy receiver that takes the vibrational energy stored in the transverse wave and turns it into rotational motion. The rotational motion can then be used to drive an electric generator. A tension control unit provides tension to the line ensuring the amplitude of the transverse wave is at a maxima when it reaches the energy receiver.

Abstract: Embodiments described herein relate to a self-adaptive thermal management system. The thermal management system includes a first body, a second body, and a third body. The second body has a first layer and a second layer formed from a Weyl semimetal and a third layer sandwiched between the first layer and the second layer. The third layer is formed from a vanadium dioxide film. The second body is spaced apart from the first body. The third body is spaced apart from the second body. The second body is a modulator configured to transition between a metallic phase and an insulating phase dependent on a temperature to regulate a heat from the first body to the third body through the second body in a self-adaptive manner dependent on the temperature.

Abstract: Systems, methods, and other embodiments described herein relate to harvesting circular motion, such as from waves in the ocean. In one embodiment, an energy harvesting device includes a cantilevered shaft attachable horizontally to a body experiencing wave motion. A resonator mass is attached to a free end of the cantilevered shaft. The resonator mass moves with circular motion as the body experiences the wave motion. The energy harvesting device also includes an energy conversion system operatively coupled to the cantilevered shaft. The energy conversion system generates electrical energy from two orthogonal motion components of the circular motion of the resonator mass. The energy harvesting device also includes an energy storage device to store the electrical energy.

Abstract: Systems and methods for estimating the incident angle of an acoustic wave are presented herein. One embodiment is an incident-angle estimation system that includes at least two transducers that receive an acoustic wave and output alternating-current (AC) signals. The system also includes bandpass filters to produce bandpass-filtered AC signals from the AC signals. The system also includes rectifiers to convert the bandpass-filtered AC signals to direct-current (DC) voltages. In this embodiment, the system also includes a processor and a memory storing machine-readable instructions that, when executed by the processor, cause the processor to estimate the incident angle of the acoustic wave based on an analysis of the DC voltages. In another embodiment, an analog circuit to which the DC voltages are input produces an estimate of the incident angle.

Abstract: Disclosed are systems that utilize metamaterials to improve the acoustic performance of a panel, such as a glass panel used in automotive applications. In one example, the system may include a panel having an exterior edge and a metamaterial attached adjacent to the exterior edge of the panel. The metamaterial is configured to minimize the reflection coefficient of flexural waves acting upon the panel.

Abstract: Systems, methods, and other embodiments described herein relate to a cooling system that includes vibrating protrusions to disturb a dissipation-blocking thermal boundary layer. In one embodiment, a cooling system includes a base from which vibrating protrusions extend. The base exhibits 1) vibration at multiple frequencies in a first direction and 2) vibration at multiple frequencies in a second direction. The cooling system includes a first set of vibrating protrusions that vibrate in the first direction. Different vibrating protrusions in the first set have different resonance frequencies that align with the multiple frequencies in the first direction.