15results about How to "Reduce magnification" patented technology

The invention discloses an intelligent processing system and method for a magnetoelectric tachometric transducer, and relates to the technical field of engine control, the system comprises an electronic control unit, a signal acquisition circuit, an amplification circuit and a signal calculation circuit; the signal acquisition circuit is used for acquiring a voltage signal output by the magnetoelectric rotating speed sensor; the amplifying circuit is used for amplifying the voltage signal to obtain an amplified signal; the signal calculation circuit is used for calculating the rotating speed of the engine at the second moment according to the amplified signal; the amplifying circuit is used for amplifying the voltage and comprises a numerical control variable resistor; the resistance value of the numerical control variable resistor is controlled by the electronic control unit, the amplification factor is adjusted by adjusting the resistance value, when the rotating speed is low and the signal is weak, the signal amplification factor is large to ensure that the signal can be normally detected, and when the rotating speed is high and the signal is strong, the signal amplification factor is small to reduce the interference signal.

The utility model provides a wide-energy liquid flicker counting device, which comprises a photomultiplier module, a signal adjusting module, a logarithm converter module, a comparator module and a counter module. According to the wide-energy liquid flicker counting device provided by the utility model, the gradual compression principle is utilized, the amplification factor is reduced along with the increase of the input energy intensity, and the amplitude of an output signal is increased on year-on-year basis along with the logarithm increase of the amplitude of the input signal, so that the dynamic input range can be greatly improved, and meanwhile, the continuous change of the output signal is ensured; the device is simple in structure design, can realize dynamic energy range input measurement from a few keV to dozens of MeV without additionally adding a complex feedback circuit and a control circuit, and can effectively control and reduce the cost.

The invention provides a malicious user identification method and system giving consideration to privacy protection in a social network, and relates to the technical field of network privacy security, and the method comprises the steps: carrying out the structure perception sub-graph segmentation of a social network graph through an METIS algorithm, dividing an original graph into a plurality of sub-graphs, minimizing the number of edges crossing the sub-graphs, and keeping the scale balance of the sub-graphs; constructing a privacy perception GNN of an integrated gating residual attention module, wherein the privacy perception GNN comprises a privacy perception linear layer and a gating residual mechanism; based on differential privacy stochastic gradient descent framework training, combining an adaptive noise scheduling strategy, dynamically adjusting the noise scale according to privacy consumption deviation, and performing closed-loop control budget to obtain a trained model; and malicious users are identified through the trained model. According to the method, the problem of performance reduction caused by fixed noise injection and noise amplification is solved, and efficient and robust identification of malicious users is realized while differential privacy constraints are met.

The embodiment of the application discloses a high-dimensional NOT gate implementation method based on a lattice cold atom system and a related device. The method comprises sequentially exciting the first n energy levels of the lattice cold atom system through respective excitation frequencies, exciting k energy levels upwards, exciting the first n-1 energy levels after the upward excitation k-1 energy levels downwards, and exciting the n energy level after the upward excitation to the first energy level, thereby obtaining a high-dimensional NOT gate with a dimension of n, wherein k is an integer greater than n-1, so that the high-dimensional NOT gate is directly realized in the lattice cold atom system. The embodiment of the application is beneficial to reducing the depth of the quantum circuit, thereby reducing the accumulation and amplification of errors, and realizing high-dimensional quantum computing.

This utility model relates to the field of metering box technology, specifically to an electricity metering box that facilitates user data reading. It includes a metering box with an electricity meter fixedly connected inside. A protective door is hinged to the surface of the metering box to protect the electricity meter. An amplifying component is slidably disposed on the inner wall of the protective door. The amplifying component includes a connecting frame slidably connected to the inner wall of the protective door. The connecting frame drives the amplifying component to slide along the inner wall of the protective door. By sliding the connecting frame of the amplifying component, the amplifying component is moved closer to the electricity meter, increasing the magnification and avoiding blurred readings due to insufficient magnification. When the digit display size is large, the sliding connecting frame moves the amplifying component away from the electricity meter, reducing the magnification and preventing the digits from exceeding the field of view and becoming incompletely displayable. This ensures that digits of different sizes can be clearly and completely observed without the observer needing to open the protective door.

The utility model relates to the technical field of sensor brackets, and discloses a multifunctional mounting bracket for a wireless sensor of a comprehensive logging instrument, which is characterized in that a mounting bracket base is fixedly welded on the upper end surface of a damping component, and the damping components are symmetrically fixedly welded on the two sides of the mounting bracket base; a lower bottom plate is fixedly welded to the upper end face of the damping assembly, a main vertical support is fixedly welded to the upper end face of the lower bottom plate, sliding side frames are symmetrically fixedly welded to the two sides of the main vertical support, and sliding grooves are slidably formed in the sliding side frames. The accuracy is enhanced; in addition, the base provides vibration isolation, isolates an external vibration source, and prevents the sensor from being interfered. And the service life of the sensor is prolonged, the mechanical stress is reduced, and the sensor is more durable in a high-vibration environment.

The invention provides a vibration isolation and buffering composite device, and belongs to the technical field of vibration isolation, and the device comprises a lower shell and a bottom plate which are fixedly connected to form a lower cavity; the lower core shaft is provided with a lower core shaft pressing plate extending in the radial direction, the lower core shaft pressing plate is arranged in the lower cavity, and the lower core shaft partially penetrates through the lower shell; the lower spring is arranged in the lower cavity; the lower guide sleeve is arranged on the outer side of the lower spring; the first anti-vibration pad and the second anti-vibration pad are arranged in the lower cavity and located on the two sides of the lower mandrel pressing plate; the upper shell is fixedly connected with the lower shell to form an upper cavity; the upper core shaft is provided with an upper core shaft pressing plate extending in the radial direction, the upper core shaft pressing plate is arranged in the upper cavity, and the upper core shaft partially penetrates through the upper shell to be connected with the lower core shaft; the upper spring is arranged in the upper cavity and located between the upper mandrel pressing plate and the upper shell. The upper guide sleeve is arranged on the outer side of the upper spring; and the third anti-vibration pad and the fourth anti-vibration pad are arranged in the upper cavity and located on the two sides of the upper mandrel pressing plate.

The invention discloses a six-degree-of-freedom two-stage micro-vibration isolator based on negative stiffness and damping integrated regulation and control, belongs to the technical field of precise vibration isolation, and realizes multi-degree-of-freedom near-full-band vibration isolation performance under variable load by utilizing twelve sets of low-frequency vibration isolation dampers which are connected with an upper plate and a base plate and are arranged in a Stewart mode. According to the low-frequency vibration isolation damper, a negative stiffness and damping integrated regulator and a spiral spring are connected in parallel to support a load platform, the negative stiffness and damping integrated regulator constructs a single-side high-flux-density excitation magnetic field through multiple layers of uniform-section magnetic ring arrays which are arranged in an array mode in the axial direction and vertically magnetized between the adjacent layers, and the magnetic field intensity of the non-working side is effectively weakened; the vertically magnetized fixed magnetic ring array and the moving magnetic ring array are coaxially nested to realize the high negative stiffness characteristic, and are coaxially nested with the coil to realize the high damping characteristic, and local low dynamic stiffness and adjustable high damping characteristics can be generated under the large bearing condition by regulating and controlling the energizing current of the coil; and the rigidity and damping parameters for realizing near-full-band high-performance vibration isolation at multiple degrees of freedom are accurately matched.

A zoom optical system according to an embodiment of the present application includes, arranged in order from an object side to an image side, a first lens group, a second lens group, a third lens group, and a fourth lens group, wherein each of the first lens group to the fourth lens group includes at least two lenses, the second lens group and the third lens group are movable, and an effective focal length (EFL) at a wide angle is defined by the following expression: EFL = H / 2 tan (A / 2) where EFL wide refers to the effective focal length of the zoom optical system at the wide angle, and H imageD refers to half of the diagonal length of an image sensor pixel area.

The utility model provides a passive infrared detection device that can shorten the power-on time, which comprises a pyroelectric infrared sensor and a multi-stage amplification circuit. The multi-stage amplification circuit comprises a primary amplification circuit and at least two secondary amplification circuits. Each stage of amplification circuit is provided with a negative feedback amplification circuit and has an operational amplifier OP, a feedback resistor R1 connected between the inverting input and output of the operational amplifier OP, and a series RC circuit connected to the inverting input of the operational amplifier OP. The total amplification factor of the multi-stage amplification circuit is greater than or equal to 1000, and the ratio of the resistance R1 in the feedback resistor and the resistance R in the series RC circuit in the same stage of amplification circuit satisfies 1 < R1:R ≤ 40. In this way, without changing the high-pass cutoff frequency and total amplification factor of the multi-stage amplification circuit, the power-on time is shortened by increasing the number of stages of the multi-stage amplification circuit and reducing the amplification factor of each stage of amplification circuit.

The invention comprises: a laser oscillator (20) having a first laser active medium, the first laser active medium having a mixed gas containing carbon dioxide gas, the laser oscillator (20) oscillating a pulse laser having a half-value full width between 15 ns and 200 ns; and a laser amplifier (30) having a second laser active medium, the second laser active medium having a mixed gas containing carbon dioxide gas, the pulse laser oscillated from the laser oscillator (20) passing through the second laser active medium, thereby being shortened to a pulse laser having a half-value full width between 5 ns and 30 ns and outputted.

The present application provides use of Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof in manufacture of a medicament useful in treating a disease related to high expression or abnormal activation of JAK and SYK kinases, comprising an autoimmune disease, such as an immune-mediated skin disease, in particular psoriasis, atopic dermatitis and SLE. Compound (I), an optical isomer thereof or a pharmaceutically acceptable salt thereof according to the present invention can improve the skin lesions in mice with psoriasis, atopic dermatitis and SLE, alleviate the injury of kidney, inhibit the expansion of immune organs, reduce the level of inflammation, inhibit the increase of SLE related antibodies and cytokines in serum, and has a certain safe therapeutic window, which has a good clinical application prospect.

The utility model discloses a forest fire prevention emergency alarm device which structurally comprises a stand column, a gas collecting hood and a smoke alarm, a suction fan generates suction force to suck air outwards, the air is sucked into an air cavity through an air inlet formed in the outer side of the gas collecting hood, and external impurities or insects are prevented from entering the air cavity through an external filter screen. In the process that air enters the air cavity and then goes downwards, the air can be analyzed through induction of the smoke alarm, if smoke exists, an alarm is given, and information is transmitted through the signal transmitter, so that a worker can control the motor to enable the rotating fixed column at the upper end to drive the camera to rotate; therefore, the smog can be observed, the fire can be monitored in time and treated in time, and the problem of fire is avoided.

The invention discloses a cable fault abnormal data self-checking method and system based on multi-source traveling wave comparison, and relates to the field of power system protection and fault diagnosis. Under the condition that sampling clocks are inconsistent, overlapped data segments which can be mutually correlated are formed through same-window triggering collection and caching; performing wave head transient feature extraction on the multi-phase sheath traveling wave, obtaining the relative time difference of each channel by using cross correlation, and constructing a relative time difference matrix and an energy ratio matrix in combination with a wave head neighborhood energy ratio; generating a normalized reliability weight according to the signal-to-noise ratio and the energy consistency, jointly estimating the arrival time of each channel wave head in a weighted iteration time estimation model, identifying and correcting outlier abnormal data, and obtaining a self-checked arrival time sequence; and the position / segment length of the grounding box and traveling wave propagation velocity mapping are combined to output the position of a fault point. As a result, reliable positioning without high-precision synchronization is achieved.

The application relates to the field of electricity price prediction, and discloses a medium and long term electricity price prediction method, device and computer equipment suitable for a power market, which comprises the following steps: acquiring operation related time sequence data of the power market; obtaining first time sequence data on a first feature dimension from the operation related time sequence data according to the first feature dimension; wherein the first feature dimension is a feature dimension related to a bidding space; performing time sequence prediction on feature performance on the first feature dimension according to the first time sequence data to obtain bidding related time sequence data; and performing medium and long term electricity price prediction based on the bidding related time sequence data and the operation related time sequence data to obtain a predicted electricity price. Thus, by respectively performing stage-by-stage refined prediction on the bidding space related features and other operation related features, various factors influencing the electricity price can be more comprehensively captured, the accumulation and amplification of prediction errors are reduced, and therefore the final electricity price prediction result is more accurate.