9results about How to "Good zoom effect" patented technology

The invention provides an automatic gain control method and circuit of an ultrasonic flow metering device, and aims to improve the accuracy and stability of flow metering. According to the method, the gain is automatically adjusted by measuring the pulse width of an echo signal and comparing the pulse width with an expected value. The circuit comprises a transmitting circuit, an ultrasonic transducer, a variable gain amplifier, a variable threshold comparator, a zero-crossing comparator, a flight time measuring unit, a pulse width measuring unit, a time-to-digital converter and a calculation and control unit. According to the scheme, independent gain configuration of uplink and downlink flight time and a fine gain adjustment strategy based on echo amplitude change can be realized. In addition, by setting the allowable maximum pulse width change value, whether the measurement error is within a reasonable range can be automatically judged, and re-measurement can be carried out when necessary. According to the integrated design scheme, the flexibility and the response speed of measurement are improved, the signal processing flow is optimized, and an innovative solution is provided for ultrasonic flow metering.

The invention relates to a control method of a microwave power amplifier of an unmanned aerial vehicle, and the method comprises the steps: sequentially transmitting signals of different types and intensities to the unmanned aerial vehicle, and enabling an unmanned aerial vehicle signal detection module to recognize the types of received signals, detect the intensities, and give different gains; the microwave power amplifier carries out signal amplification, and the execution system executes corresponding actions according to received signals; acquiring various data of the test flight time period of the unmanned aerial vehicle, and extracting corresponding gain data in which the execution action state of the unmanned aerial vehicle meets specified requirements; constructing a training data sample and inputting the training data sample into the gain prediction model for training; collecting a received signal in real time and inputting the received signal to a gain prediction model for gain prediction; performing corresponding gain amplification processing on the received signal; and monitoring the action execution state of the unmanned aerial vehicle in real time, feeding back the action execution state to the gain prediction model, and optimizing parameters of the gain prediction model. Different amplification processing of signals of different types and intensities is realized, the signal quality is enhanced, and the stability and reliability of the signals are improved.

The invention discloses a lactic acid bacteria bionic extracellular vesicle as well as a preparation method and application thereof, and belongs to the technical field of medical materials. According to the preparation method of the lactic acid bacteria bionic extracellular vesicles disclosed by the invention, lactic acid bacteria cells are efficiently broken by utilizing a high-pressure homogenization technology, and the lactic acid bacteria bionic extracellular vesicles are separated and purified by adopting differential and ultraspeed centrifugation. The preparation method disclosed by the invention is simple and controllable in process, and large-scale amplification and standardized production are easy to realize; the obtained bionic extracellular vesicles of lactic acid bacteria are higher in yield and uniform in particle size than natural extracellular vesicles, have similar safety to the natural extracellular vesicles of lactic acid bacteria, and can promote immune maturation of dendritic cells and drug delivery carrier activity. The compound can be used as a vaccine adjuvant, an immunopotentiator and a vaccine and nano-drug delivery carrier to be applied to the field of biological medicine.

The present invention discloses an optical lens structure, comprising a lens holder, wherein a rotating cylinder and a power driving group capable of driving the rotating cylinder to rotate are arranged on the lens holder, a guide shaft fixedly connected to the lens holder is arranged on the inner side of the rotating cylinder, a lens group capable of sliding along the guide shaft is connected to the guide shaft, an inclined groove is arranged on the rotating cylinder, and a transmission foot matched with the inclined groove is arranged on the lens group, when the rotating cylinder rotates, the groove wall of the inclined groove pushes the transmission foot to make the lens group slide back and forth, the present invention is simple to process, avoids machining errors caused by machining multiple inclined grooves, which may cause the lens group to tilt and shift in the center when moving, adopts two guide shafts for auxiliary guiding, makes the lens group more stable when moving over a long distance, has better parallelism, has a simple structure, and is low in cost, thus greatly improving the quality of optical lens products.

The invention relates to the field of medicinal chemistry, and particularly discloses a novel TLR8 agonist intermediate as well as a preparation method and application thereof, which are suitable for process development of 4, 6-diaminopyridino [3, 2-d] pyrimidine TLR8 agonists. According to the preparation method, tert-butyl is adopted to replace 2, 4-dimethoxybenzyl to serve as an amino protecting group, so that the crystallization property of the intermediate is remarkably improved, column chromatography is avoided, the cost is reduced, and the process stability is improved. The preparation method of the TLR8 agonist intermediate comprises the steps of reduction, acylating chlorination, coupling, amination and the like, has the advantages of being easy and convenient to operate, high in yield, environmentally friendly and the like, and is particularly suitable for industrial production.

The present invention relates to a single-rod variable friction damper, including a left ball joint seat, a left end cover, a core shaft, a friction disc, a wear-resistant disc, a lead screw, a pinion, a large gear, a cylinder body, a guide slider, a lead screw nut, a connecting rod, an active slider, a right ball joint seat and a right end cover. The right ball joint seat drives the active slider to move along the core shaft, which drives the lead screw nut to reciprocate through the connecting rod, and the reciprocating motion of the lead screw nut drives the lead screw to rotate; when the lead screw rotates, the large gear meshes with the pinion gear for transmission, and the friction disc and the wear-resistant disc perform rubbing motion to generate damping force. The damping force can be changed by changing the number of rubbing plates of the wear-resistant disc and the friction disc; the present invention forms a rotating slider mechanism by connecting parallel lead screws, cylinder body slide grooves, connecting rods and active sliders, and has the advantages of gapless transmission, large axial rigidity, long sliding displacement, strong load-bearing capacity and good dynamic performance.

The application provides a continuous synthesis method of a triamide compound and application thereof, relates to the technical field of organic synthesis, and comprises the following steps: (a) feeding ketoxime and a solvent into a micro-channel reactor to generate a hydrogenation reaction, so as to obtain an amine intermediate; and (b) feeding the amine intermediate, an acid chloride and an acid binding agent into the micro-channel reactor to generate an amidation reaction, so as to obtain the triamide compound. The application has the advantages of stable heat release, accurate residence time control, safe and reliable operation, and good amplification performance. Compared with a traditional method, the production efficiency of the application is higher, the production cost is greatly reduced, the low-cost and high-efficiency and large-scale production of the triamide nucleating agent can be realized, and the green synthesis and industrial application of the high-performance nucleating agent are facilitated.

The utility model relates to a motor, a camera module and electronic equipment. The motor comprises a first carrier; at least one part of the first driving assembly is arranged on the first surface of the first carrier; at least one part of the second driving assembly is arranged on the second surface of the first carrier, and the first driving assembly and the second driving assembly drive the first carrier to move in the first direction; and the first surface and the second surface are intersected with two surfaces of the first carrier. The first driving assembly and the second driving assembly are arranged on the two intersecting faces of the first carrier of the motor respectively, so that the motor has larger thrust, the first carrier can be supported to have a longer movement stroke, close-range focusing of the camera module is achieved, and the zooming capacity of the camera module is improved.

The utility model relates to the technical field of signal processing, in particular to an intelligent sensor signal processing circuit, which comprises a signal differential amplification circuit and a signal inverting amplification circuit, the signal differential amplification circuit is composed of resistors R1, R2, R3, R4, R5, R6, R7, R9, R10, R11, R12, R13 and R14, capacitors C1, C2, C3, C5 and C6, a dual-channel operational amplifier U1A, and double diodes D1 and D2, and the signal inverting amplification circuit is composed of resistors R1, R2, R3, R4, R5, R6, R7, R9, R10, R11, R12, R13 and R14, capacitors C1, C2, C3, C5 and C6. The signal inverting amplification circuit is composed of a resistor R8, a resistor R15, a resistor R16, a capacitor C4, a dual-channel operational amplifier U1B and a protection diode T1, the two stages of amplification circuits are arranged, the front half part is the signal differential amplification circuit, the rear half part is the signal inverting amplification circuit, and through signal amplification processing of the front part and the rear part, a better amplification effect can be achieved; the signal amplification effect is more obvious; meanwhile, the input end voltage of the two-channel operational amplifier U1A can be clamped between-12V and + 12V through the double diodes D1 and D2 so as to protect the operational amplifier and prevent the operational amplifier from being burnt out due to overlarge voltage.