Abstract: The sound leakage reduction device may include an energy conversion structure, a vibration structure, and a housing. The housing may include a vibration cavity and at least one resonance cavity. The energy conversion structure may be located in the vibration cavity and connected with the vibration structure. The at least one resonance cavity may communicate with the vibration cavity through at least one communication hole. A volume of each resonance cavity may be smaller than a volume of the vibration cavity.

Abstract: A method for determining ciprofloxacin in a meat product based on an enzyme-linked upconversion fluorescence and potassium titanium oxalate system is provided. An enzyme-linked upconversion nanoparticle solution is mixed with an aptamer-bound magnetized polydopamine solution to obtain a fluorescence-ultraviolet dual-signal detection system. A fluorescence standard curve and a colorimetric standard curve for the ciprofloxacin content determination are created through the fluorescence-ultraviolet dual-signal detection system in combination with potassium titanium oxalate and hydrogen peroxide. A fluorescence intensity signal characteristic value and an ultraviolet absorbance signal characteristic value of a meat sample solution are determined. A ciprofloxacin content in the meat sample is calculated according to the fluorescence standard curve and the colorimetric standard curve.

Abstract: A process and a device for continuous flow side-chain alkylation which relate to the technical field of organic synthesis. In this process and the device for continuous flow side-chain alkylation, an ibuprofen raw material is prepared with alkylbenzene as a raw material. This raw material alkylbenzene is easily available and has a low cost, and is suitable for scale-up production. Moreover, an entire preparation process adopts continuous chemical synthesis, and a reaction time of each stage can be precisely controlled, which is beneficial to control a total reaction time and reduce an amount of impurities produced. In this way, a purity and a yield of the ibuprofen raw material are improved. In summary, a continuous synthesis method for side-chain alkylation of alkylbenzene provided by the present disclosure shows a low cost and a high yield.

Abstract: An easy-to-clean visual grain monitoring device includes a housing. A circuit board is provided within the housing and is connected with a monitoring unit; an insect collecting pipe, which is provided within the housing, includes multiple first entrances; the housing includes multiple second entrances which are corresponding to the first entrances respectively; an execution element, which is installed on a base, is connected with a lower end of the insect collecting pipe for driving the insect collecting pipe to move up and down; an insect leaking passage, which is provided at an upper end of the base, extends downwards along a side wall of the base; a tail end of the insect leaking passage has a first insect leaking hole for discharging pests, the housing has a second insect leaking hole in a position corresponding to the first insect leaking hole.

Abstract: The present disclosure discloses an acoustic device and a support assembly. The support assembly may include a shell configured to provide a space for accommodating one or more components of the acoustic device. The support assembly may further include an interaction assembly configured to realize an interaction between a user and the acoustic device, wherein the interaction assembly include a first component and one or more second components, in response to receiving an operation of the user, the first component is configured to trigger at least one of the one or more second components to cause the acoustic device to perform a function corresponding to the at least one of the one or more second components.

Abstract: An open acoustic device (100) may include a fixing structure (120) configured to fix the acoustic device (100) near an ear of a user without blocking an ear canal of the user; a first microphone array (130) configured to acquire environmental noise (410); a signal processor (140) configured to: determine, based on the environmental noise, a primary route transfer function (420) between the first microphone array (130) and the ear canal of the user; estimate, based on the environmental noise and the primary route transfer function, a noise signal (430) at the ear canal of the user; and generate, based on the noise signal at the ear canal of the user, a noise reduction signal (440); and a speaker (150) configured to output, according to the noise reduction signal, a noise reduction acoustic wave (450), the noise reduction acoustic wave being configured to eliminate the noise signal.

Abstract: Disclosed is an earphone including: two speaker assemblies, a connection member, and a processing circuit. The connection member is configured to connect the two speaker assemblies, and the connection member provides, through a bending deformation, a clamping force for placing the two speaker assemblies on a head of a user, and the connection member includes a housing with an accommodation cavity. A bending sensor is disposed in the accommodating cavity, and the bending sensor is configured to generate a bending signal based on a bending state of the connection member. The processing circuit is configured to determine a placement state of the earphone based on the bending signal. The placement state includes one of a normal wearing state, an abnormal wearing state, or a free placement state.

Abstract: One or more embodiments of the present disclosure relates to an acoustic output device, including: a piezoelectric element configured to convert an electrical signal into a mechanical vibration; an elastic element; and a mass element connected to the piezoelectric element through the elastic element. The mass element may be configured to receive the mechanical vibration and generate an acoustic signal, and on a plane perpendicular to a vibration direction of the mass element, the elastic element may provide shear stresses with opposite curls.

Abstract: The present invention relates to a bone conduction speaker and its compound vibration device. The compound vibration device comprises a vibration conductive plate and a vibration board, the vibration conductive plate is set to be the first torus, where at least two first rods inside it converge to its center; the vibration board is set as the second torus, where at least two second rods inside it converge to its center. The vibration conductive plate is fixed with the vibration board; the first torus is fixed on a magnetic system, and the second torus comprises a fixed voice coil, which is driven by the magnetic system. The bone conduction speaker in the present invention and its compound vibration device adopt the fixed vibration conductive plate and vibration board, making the technique simpler with a lower cost; because the two adjustable parts in the compound vibration device can adjust both low frequency and high frequency area, the frequency response obtained is flatter and the sound is broader.

Abstract: Disclosed is an earphone comprising two speaker assemblies and a connection member. The connection member is used to connect the two speaker assemblies. The connection member provides a clamping force for placing the two speaker assemblies at a user's head through a bending deformation. The connection member includes a housing with an accommodation cavity, a capacitance sensor is disposed in the accommodation cavity, and the capacitance sensor is configured to identify a bending state of the connection member. The capacitance sensor includes a shielding structure that has a constant potential and is used to reduce an effect of an external electric field on the capacitance sensor.

Abstract: Disclosed is a loudspeaker, comprising a vibration diaphragm configured to vibrate to generate air-conducted sound waves and a casing configured to form an accommodation cavity. The vibration diaphragm divides the accommodation cavity into a front cavity and a rear cavity, the casing being provided with a sound outlet hole in flow communication with the front cavity, and at least a portion of the air-conducted sound waves being transmitted to the outside of the loudspeaker via the sound outlet hole. The casing is provided with a sound absorption pipe, and the sound absorption pipe is in flow communication with at least one of the front cavity and the rear cavity and configured to absorb sound waves of a target frequency in the air-conducted sound waves, and a length of the sound absorption pipe being in a range of 3/20-2/5 of a wavelength of the sound waves of the target frequency.

Abstract: A speaker includes a shell, a diaphragm, and a sliding connection portion. The shell includes a cavity. The diaphragm is accommodated within the cavity and separates the cavity to form at least two sub-cavities. The diaphragm is driven by an electrical signal to vibrate to generate sound. The sliding connection portion is configured to connect an edge of the diaphragm to an inner wall of the cavity. The sliding connection portion allows the edge of the diaphragm to slide relative to the inner wall of the shell. Therefore, the diaphragm can move (slide) relative to the inner wall of the shell. In other words, the diaphragm can make a piston-like movement relative to the inner wall of the shell, which allows the diaphragm to generate a greater displacement, push more air, and thereby improving the performance of the speaker, especially the sensitivity of the speaker at a low frequency range.

Abstract: Embodiments of the present disclosure provide an acoustic output device, comprising: an acoustic output unit, a contact detection sensor, and a processor. The acoustic output unit includes a vibration unit and a casing, the casing at least including a contact region which is in contact with the face of a user; the contact detection sensor is located at the contact region; and the processor is configured to determine whether the user wears the acoustic output device based on an electrical signal generated when the contact detection sensor is in contact with the face of the user.

Abstract: The embodiments of the present disclosure provide a touch sensor device. The touch sensor device comprises a housing, configured to provide a touch region; and at least one sensor, configured to be fixed near the touch region. The at least one sensor includes: a signal transmitting unit, configured to generate a vibration signal under the action of an excitation signal; a signal receiving unit, configured to receive the vibration signal and generate an output signal; and a processor, configured to recognize a touch operation performed on the touch region according to the output signal.

Abstract: A loudspeaker comprising a diaphragm, a housing, and a cavity structure is provided. The diaphragm is configured to vibrate to produce air-conducted sound waves. The housing is configured to form an accommodation cavity for housing the diaphragm. The diaphragm divides the accommodation cavity into a front cavity and a rear cavity. The housing is provided with a sound outlet hole communicating with the front cavity, and at least a portion of the air-conducted sound waves is transmitted through the sound outlet hole to an exterior of the loudspeaker. The cavity structure is provided on the housing and communicated with at least one of the front cavity and the rear cavity, and the cavity structure is configured to absorb a sound wave with a target frequency in the air-conducted sound waves.

Abstract: The present disclosure discloses a method and a system for detecting an abnormal traffic behavior. The method of the present disclosure includes: retaining an abnormal static target vehicle in a traffic surveillance video in a background through background modeling; performing abnormal target detection, and obtaining a cropped picture of an abnormal target vehicle and a cropped video clip through cropping; performing anomaly start time estimation, inputting the cropped picture and the cropped video clip to a network model combining twin cross-correlation with pseudo three-dimensional (P3D)-Attention, labeling a classification label on the cropped video clip, and determining a video frame when abnormal behavior occurs; and determining whether a to-be-matched vehicle is an abnormal target vehicle, and determining a start time and an end time of abnormal traffic behavior with reference to the video frame that is obtained when the abnormal behavior occurs.

Abstract: Provide a sensing device comprising a cavity and an air pressure sensor disposed within the cavity. The cavity includes two elastic walls disposed opposite to each other and a rigid wall connecting the two elastic walls, wherein the rigid wall is in a form of a tubular structure, and the two elastic walls are configured to seal the tubular structure to form the cavity. A deformation of the two elastic walls changes air pressure within the cavity, and the air pressure sensor is configured to generate an electrical signal in response to the change of the air pressure.

Abstract: Embodiments of the present disclosure provide an electrode structure including: a plurality of electrodes. Each of the plurality of electrodes is flexibly connected to at least another of the plurality of electrodes through a connector. The connection member allows electrically conduction of the connected electrodes. Electrode structures provided by embodiments of the present disclosure have a great elasticity coefficient range, and the electrode structures are adjustable.

Abstract: The present application discloses a sound-output device, a vibration speaker configured to generate a bone-conducted sound wave; and an air-conducted speaker configured to generate an air-conducted sound wave. The vibration speaker is coupled to the air-conducted speaker through a mechanical structure; and the bone-conducted sound wave is input to the air-conducted speaker at least in part as an input signal.

Abstract: Embodiments of the present disclosure provide a headphone including a sound production component and an ear hook. The ear hook includes a first portion and a second portion connected in sequence. The first portion being hooked up between an ear auricle and a head of a user, and the second portion is configured to be hang between an auricle of a user and a head of the user, the second portion extends toward a front outer side of the auricle, connects with the sound production component, and is configured to place the sound production component at a position close to an ear canal without blocking an opening of the ear canal, and at least a portion of the sound production component is inserted into an concha cavity. The sound production component and the first portion of the ear hook clamp the auricle in a wearing state.