Abstract: A power supply circuit and a light-emitting diode (LED) driving system using the power supply circuit are provided. The power supply circuit includes a linear conversion circuit, a first capacitor, and a direct current-direct current (DC-DC) conversion circuit, where an alternating current input signal is rectified to form a first rectified voltage. The linear conversion circuit receives the first rectified voltage and has an output terminal connected to the first capacitor. After the power supply circuit is started, the linear conversion circuit controls the first rectified voltage to charge the first capacitor in a time period when the first rectified voltage is near a trough. The DC-DC conversion circuit receives a first capacitor voltage and performs power conversion to output a supply voltage. At least part of the linear conversion circuit and at least part of the DC-DC conversion circuit can be integrated with an LED driving circuit.

Abstract: A lighting circuit and a control method thereof are provided. The lighting circuit includes a triac dimmer connected between an alternating current (AC) input power supply and a rectifier circuit, where the rectifier circuit is configured to output a bus voltage after phase cutting, and further includes a turn-on angle detection circuit configured to detect a turn-on state of the triac dimmer and output a first detection signal that represents a relationship between a turn-on angle of the triac dimmer and a first angle, and a bleeder circuit connected to the rectifier circuit and configured to control turn-off time of the bleeder circuit based on the first detection signal and a sampling signal representing a current of a light-emitting diode (LED) load.

Abstract: Embodiments of this application provide a computing node and a computing device. The computing node includes a mainboard and a current guiding structure. An electronic component is mounted on a first surface of the mainboard, a through-current hole is disposed in a thickness direction of the mainboard, a hole wall of the through-current hole has a conductive medium, and the through-current hole is electrically connected to the electronic component. The current guiding structure is configured to be connected to a power supply, and is configured to transmit a power supply current output from the power supply, and the current guiding structure is disposed on a side of the mainboard, and is electrically connected to the hole wall of the through-current hole, to transmit the power supply current to the through-current hole in the thickness direction of the mainboard.

Abstract: The present disclosure relates to a microfluidic chip and a microfluidic chip detection system. The microfluidic chip including: a storage member provided with a groove therein, at least two storage chambers being disposed around the groove; a base disposed at one end of the storage member away from the groove, a reaction chamber being disposed on the base; and a valve disposed in the groove, the valve being configured to operatively communicate any one of the at least two storage chambers with the reaction chamber. The present disclosure can lead the solution in any storage chamber to the reaction chamber or lead the solution in the reaction chamber to any storage chamber by operating the valve, so that the solution transfer is realized, the structure is simple and compact, the length of the flow channels can be greatly shortened, and the detection efficiency is improved.

Abstract: A flyback converter, a constant-current control method, and a lighting system are provided. The constant-current control method includes: sampling a loop current in a resonant loop to obtain a first sampling signal; obtaining zero crossing time of an excitation current in the resonant loop; and turning off a first switch tube when the first sampling signal reaches a reference value, and turning off a second switch tube after the zero crossing time of the excitation current in the resonant loop to control an average value of the excitation current to keep constant. The present disclosure can achieve a constant average value of an excitation current in each switching cycle based on a loop current in a resonant loop on the primary side of the converter, thereby realizing constant-current control of an output current of the converter.

Abstract: The present application discloses a lighting control circuit, a lighting control method, and a lighting circuit. The lighting control circuit includes at least a protocol conversion circuit, and a driving signal generation circuit. The dimming selection circuit stores an input data signal as multi-channel digital signals. The driving signal generation circuit controls an off time of a main power transistor according to a first dimming signal derived from the multi-channel digital signals in a first dimming mode, and controls an off time of the main power transistor according to a reference signal derived from the multi-channel digital signals and an output feedback signal in a second dimming mode. The lighting control circuit according to the present disclosure stores the input data signal as multi-channel digital signals, and the circuit can be configured with different dimming modes according to the protocol alone to improve the circuit flexibility.

Abstract: The present application discloses a driving control circuit of a power transistor, a lighting control circuit and a lighting circuit. The control circuit includes a protocol conversion circuit and a driving regulation circuit. The protocol conversion circuit stores received input data signal as multi-channel digital signals and converts the multi-channel digital signals into a plurality of regulation parameters. The driving regulation circuit adjusts the driving current and driving voltage of the power transistor according to a plurality of regulation parameters so as to match various types of power transistors. The control circuit according to the present disclosure converts the input data signal into a plurality of regulation parameters, adjusts the driving current and driving voltage of the power transistor to match various types of power transistors, and improves driving capability, compatibility, and adaptability of the circuit.

Abstract: Disclosed are a prodrug of celecoxib represented by Formula I, a preparation method therefor and an application thereof. The compound has proper solubility and is relatively stable under storage conditions. Pharmacokinetic experiments show that celecoxib can be detected in ocular tissues and is distributed in cornea, conjunctiva and aqueous humor, and the celecoxib achieves a relatively high drug concentration and thus the compound of Formula I is an excellent celecoxib prodrug. Moreover, the distribution of control compound SZY1907-P4 is almost not detected, and the concentration of eye drops prepared from the celecoxib in the cornea, conjunctiva and aqueous humor is also relatively low. The compound of Formula I has a remarkable absorption advantage, the drug concentration in the ocular tissues is remarkably higher than those of the celecoxib group and control group SZY1907-P4, and thus the compound can be prepared into liquid preparations, such as eye drops and injections, for inflammatory reactions.

Abstract: A label printing and attaching system includes a label printing device and a label attaching device. The label printing device has an ink tape supply mechanism for supplying an ink tape with a label pattern. A label tape supply mechanism of the label printing device is adapted to supply a label tape that includes a carrier tape and blank label paper adhered to the carrier tape. The label printing device further includes a heat transfer machine adapted to heat transfer the label pattern on the ink tape onto the blank label paper of the label tape to obtain a desired label. The label attaching device has a label picker adapted to pick up the label with the printed label pattern from the label tape, and a moving device adapted to move the label picker to place the picked label with the printed label pattern onto a product.

Abstract: A Near-Field Communication (NFC) antenna and an electronic apparatus include a metal structure on a personal computer (PC), an inductor, a capacitor, and an NFC chip. One end of the metal structure on the PC is coupled to one end of the inductor. The other end of the inductor is coupled to one port of the NFC chip and one end of the capacitor. The other end of the metal structure on the PC is coupled to the other port of the NFC chip and the other end of the capacitor.

Abstract: An illumination device, an LED driver circuit, a bleeder control circuit and a control method are provided. An AC input voltage is transmitted to a bus line after phase-cut processing. The bleeder control circuit includes a timing module configured to receive a bus voltage and at least one threshold voltage and generate a first time signal; a time processing module configured to receive the first time signal and generate a second time signal based on the first time signal in a previous power frequency half-wave cycle; and a control signal generation module configured to receive the second time signal and generate a first control signal for controlling a bleeder circuit. The beneficial effects of the present disclosure include the bleeder circuit being accurately controlled through the detection of the bus voltage and the implementation of the adaptive control method, thereby improving the operational efficiency and stability of the system.

Abstract: A content transmission method includes obtaining, by a first terminal device, a first instruction instructing the first terminal device to perform content transmission with a second terminal device sending, by the first terminal device, to the second terminal device, and in response to the first instruction, first information instructing the second terminal device to determine that that the first terminal device transmits content to the second terminal device. Receiving, by the first terminal device, content transmission direction indication information from the second terminal device, determining, by the first terminal device, first content, and sending, by the first terminal device, the first content to the second terminal device to display the first content.

Abstract: A leakage protection circuit and a dimming drive circuit are provided. A leakage detection circuit is configured to detect whether leakage occurs between two input terminals that receive an external signal. When leakage occurs, leakage protection measures are taken. A pulse generation circuit receives the sampling signal characterizing the voltage between the two input terminals to compare the sampling signal with two thresholds to control a detection path of the leakage detection circuit to be turned on or off according to a comparison result. The leakage detection path is enabled to be turned on twice by setting two pulse signals in a power frequency period, which can consider the leakage detection of the front-edge phase-cutting dimming and rear-edge phase-cutting dimming of the dimming drive circuit and has a wide range of applications.

Abstract: The present invention provides a compound or a pharmaceutically acceptable salt, isomer, prodrug, polymorph or solvate thereof, and a preparation method therefor and use thereof. The compound provided in the present invention has comparable or superior activity to Elagolix as a GnRHR antagonist in calcium flux assays and have better pharmacokinetic properties.

Abstract: A respirator for measuring a respiratory rate of a biofilm includes a body, a carbon dioxide absorption tube and a perforated partition disposed in an interior of the body. The perforated partition divides the interior of the body into an oxygen mass-transfer stir zone including a stirring device and a biofilm reaction zone for placing MBBR fillers. The carbon dioxide absorption tube includes an air vent and contains a solution capable of absorbing CO2. The perforated partition has a first hole corresponding to a middle portion and a lower portion of the perforated partition and acting as a liquid-exchange channel, and a second hole corresponding to an upper portion of the perforated partition and acting as a gas-exchange channel, and the oxygen mass-transfer stir zone is communicated with the biofilm reaction zone through the liquid-exchange channel and the gas-exchange channel.