Abstract: A MEMS loudspeaker manufacturing method and a MEMS loudspeaker are provided. The MEMS loudspeaker manufacturing method includes positioning a printed circuit board (PCB) substrate, inverting a MEMS chip and electrically connecting the PCB substrate to a first side of the PCB substrate having a first groove. filling and solidifying a polymer protection material in the gap between the MEMS chip and the PCB substrate, and combining the MEMS chip and the PCB substrate into a combination component. Since the PCB substrate and the MEMS chip are combined into the combination component through using the polymer protection component made of the polymer protection material, and the polymer protection component is coated with the conducting component, an overall packaging size of the MEMS loudspeaker basically is enabled to be consistent with a size of the MEMS chip, and sensitivity parameters of the MEMS loudspeaker may be significantly improved.

Abstract: A speaker structure includes a base, a diaphragm, a drive part, a first transmission part, and a second transmission part; the drive part including a first drive portion and a second drive portion, the first drive portion extending from the first end towards the second end, at least a segment of the first drive portion being disposed above the cavity, the second drive portion extending from the second end towards the first end, at least a segment of the second drive portion being disposed above the cavity, the segments of the first drive portion and the second drive portion disposed above the cavity being set in a crosswise configuration, the first transmission part being in direct contact with the first drive portion and the diaphragm, respectively, the second transmission part being in direct contact with the second drive portion and the diaphragm, respectively.

Abstract: A speaker module includes a first MEMS speaker and a second MEMS speaker disposed at two opposite surfaces of a circuit board and mounted in a flipped manner; the first MEMS speaker including a first diaphragm structure electrically connected to a first electrode connection point and is controlled by the circuit board to vibrate; the second MEMS speaker including a second diaphragm structure electrically connected to a second electrode connection point and is controlled by the circuit board to vibrate.

Abstract: The present application provides a thunderstorm activity observation and management system and method applicable to a power transmission channel. The method comprises: acquiring the number of thunderstorm days in each analysis period; respectively adjusting combined with a preset discrepancy threshold so as to obtain a thunderstorm intensity value of each analysis period; determining a voltage intensity coefficient for each analysis period according to line feature data of a power transmission channel acquired in each thunderstorm activity; and determining a thunderstorm activity assessment value according to the above two result values, wherein the thunderstorm activity assessment value is used for determining a defense level, thereby, defense resources can be scientifically allocated according to the defense level.

Abstract: The disclosure provides an electric power transmission safety monitoring system for a thunderstorm area. The system includes a transmission platform, an area characteristic analysis unit and a transmission influence analysis unit, where the transmission platform may receive an electric power transmission request sent by a current power supply end, determine a power demand end and a transmission area where the power demand end is located. After receiving the area characteristic analysis signal sent by the transmission platform, the area characteristic analysis unit carries out thunderstorm characteristic analysis, and sends the analysis result to the transmission influence analysis unit and the transmission platform. The transmission platform further formulates an electric power transmission strategy.

Abstract: The present disclosure discloses a MEMS speaker including a substrate with a cavity and a sounding assembly connected with the substrate, the substrate comprising an outer surface away from the cavity and connected with the sounding assembly, a top surface opposite to the outer surface and a side surface respectively connected with the outer surface and the top surface; a printed circuit board with a through hole and connected with the outer surface of the substrate; a first shell connected with the top surface of the substrate; and a damping mesh covering the through hole and connected with the printed circuit board; wherein sounds emitted by the sounding assembly transmit outward through the through hole and the damping mesh. Compared with the related art, MEMS speaker disclosed by the present disclosure has a better reliability.

Abstract: A support-rod head structure and a support rod are provided. The support-rod head structure includes a connecting base, a turning base and a top plate, wherein a top portion of the connecting base is provided with a first groove recessed downwards; the turning base is rotatably mounted in the first groove through a Y-direction pin shaft; the turning base is made from an elastic material, and has a top surface provided with a second groove; and a bottom surface of the top plate is fixed with a protruding rotating portion, wherein the rotating portion is detachably pressed into the second groove and rotates relative to the turning base. The support rod includes a telescopic rod and the preceding support-rod head structure, wherein a lower end of the connecting base is fixedly connected to a top end of the telescopic rod.

Abstract: A protective plate includes a first composite layer having a thickness of d1 in mm, a metal substrate, and a second composite layer having a thickness of d2 in mm that are sequentially stacked, where d1>0, and d2?0. The first composite layer and the second composite layer each includes a polymer base material and a reinforcing material, the reinforcing material includes nanoparticles, the first composite layer has a tensile strength of ?1 in MPa, the second composite layer has a tensile strength of ?2 in MPa, the metal substrate has a thickness of d3 in mm and a tensile strength of ?3 in MPa, and the protection plate meets a formula: d 3 ( d 1 + d 2 ) + d 3 × ? 3 ( ? 1 + ? 1 ) + ? 3 > 0.032 .

Abstract: An embodiment of the present disclosure provides an earphone, which includes a housing with a cavity, a first speaker housed in the cavity for producing low-frequency sounds, a second speaker for producing mid to high frequency sounds, and a sound damping mesh. The housing includes a sound outlet penetrating therethrough, and the cavity is connected with the outside through the sound outlet. The second speaker is fixed to the sound damping mesh. The sound damping mesh completely separates the first speaker from the second speaker. The low-frequency sound emitted by the first speaker is transmitted to the sound outlet through the sound damping mesh.

Abstract: A Micro-Electro-Mechanical System (MEMS) speaker is provided including only a substrate enclosing a cavity, a piezoelectric diaphragm disposed above the substrate and covering the cavity, and a flexible structure layer covering the piezoelectric diaphragm. Both the piezoelectric diaphragm and the flexible structure layer are complete sheet structures, a young modulus of the flexible structure layer is less than a young modulus of the piezoelectric diaphragm, and the young modulus of the flexible structure layer is in a range of 100 MPa to 50 GPa. The MEMS speaker in the present disclosure does away with a harder structure layer and adopts a softer flexible structure layer, which better enhances the displacement and has a more prominent acoustic performance.

Abstract: Disclosed herein are compounds or pharmaceutically acceptable salts thereof that are useful as topoisomerase I (Topo I) inhibitors. Also disclosed are pharmaceutical compositions comprising such compounds, and methods of using such compounds or compositions to treat diseases, such as cancers.

Abstract: Disclosed are a system and method for detecting a vulnerability of an Internet of Things in Power Systems (IOTIPS) protocol based on fuzz testing. The system includes: a protocol configuration module configured to configure a protocol to be detected and a data frame of the protocol to be detected; a sample generation module configured to: after loading the protocol and the data frame configured by the protocol configuration module, configure a mutation strategy based on the loaded protocol, and generate a test sample based on the configured mutation strategy; and an execution monitoring module configured to transfer the test sample generated by the sample generation module to a device to be detected for testing, perform link management and test execution, store a test result, and generate a detection report.

Abstract: A polymeric scaffold useful for conjugating with a targeting moiety can form a targeting moiety-polymer-drug conjugate. A targeting moiety-polymer-drug conjugate is prepared from the polymeric scaffold. Compositions comprise the conjugates. Methods of their preparation and methods of treating various disorders with the conjugates or their compositions.

Abstract: The present invention provides a MEMS piezoelectric speaker including a substrate with a back cavity, a diaphragm, a capacitive system and a flexible film. The diaphragm includes a fixed end, a suspended end. Adjacent suspended ends are at least partially spaced to form a slit. The suspended end includes a support section and a piezoelectric section. Along the thickness direction of the MEMS piezoelectric speaker, a flexible film is at least partially spaced from the diaphragm and the flexible film is spaced from the substrate. This design can improve the sound pressure level of the MEMS piezoelectric speaker in the middle and high frequency, and improve the acoustic performance of the MEMS piezoelectric speaker.

Abstract: An integrated synchronous nitrogen and sulfur removal device and a wastewater treatment method includes a reactor. A partition plate is horizontally arranged in the reactor to divide the reactor into a first reaction area and a second reaction area which are arranged up and down. An annular baffle plate with a height is arranged in the first reaction area to divide the first reaction area into a first reaction chamber and a second reaction chamber, and a hollow columnar carrier is arranged in the first reaction chamber, so that a third reaction chamber is formed in the first reaction chamber, and the hollow columnar carrier is made of biological stuffing. A water inlet of the reactor is arranged above the first reaction chamber, an anode and a cathode are arranged in the third reaction chamber.

Abstract: The present invention provides a MEMS piezoelectric speaker including a substrate with a back cavity, a diaphragm, a capacitive system and a flexible film. The diaphragm includes a fixed end, a suspended end. Adjacent suspended ends are at least partially spaced to form a slit. The suspended end includes a support section and a piezoelectric section. Along the thickness direction of the MEMS piezoelectric speaker, a flexible film is at least partially spaced from the diaphragm and the flexible film is spaced from the substrate. This design can improve the sound pressure level of the MEMS piezoelectric speaker in the middle and high frequency, and improve the acoustic performance of the MEMS piezoelectric speaker.

Abstract: The invention provides a MEMS speaker including a substrate enclosing a cavity, a cantilever beam at least partially suspended above the cavity, a piezoelectric actuator away from the cavity, a polymer layer away from the cavity and attached to the cantilever beam and the piezoelectric actuator for completely covering the cantilever beam, the piezoelectric actuator and the cavity, and a piezoelectric composite vibration structure formed by the polymer layer. The cantilever beam includes a first section fixed to the substrate, a second section extending from the first section to the cavity and suspended above the cavity, and a third section extending from the second section away from the first section, an end of the third section away from the second section being suspended; and the piezoelectric actuator is only fixed with the third section.

Abstract: The present disclosure provides anti-human CD33 bromo- and extra-terminal domain degrader antibody-drug conjugates, including compositions and methods of using such antibody-drug conjugates.