Abstract: A voltage mode weak-PUF circuit with rich challenge-response pairs comprises four decoders, two PUF arrays, a sequential control circuit and a voltage comparator. One-to-two PUF arrays are used to replace existing one-to-one PUF arrays to increase the number of challenge-response pairs by 2N times, from 2N realized by the one-to-one PUF arrays to 2N×2N, wherein N=a+b. Each PUF cell comprises m*n PUF cells and n transmission gates, and adopts a simple common-source amplifier structure formed by a first PMOS transistor, a first NMOS transistor and a second NMOS transistor, wherein any one PUF cell in one PUF array can be compared with any one PUF cell in the other PUF array to generate an output response. The number of output responses is 2N, so the proportion of the PUF cells for generating one challenge-response pair is 2N/2N=1/2N, and the reuse rate of the same PUF cell is merely 1/2N.

Abstract: A reconfigurable PUF with two PUF functions comprises 2m×n PUF cells, a sequential control module, a row selection module, n amplification modules, n first bit lines, and n second bit lines. Each of the 2m×n PUF cells comprises a first PMOS transistor, a second PMOS transistor, a first NMOS transistor, a second NMOS transistor, a third NMOS transistor, a fourth NMOS transistor, a fifth NMOS transistor, a sixth NMOS transistor and a seventh NMOS transistor. The PUF cells can provide two independent responses, and can operate in a SRAM mode and an inverter mode. Therefore, the reconfigurable PUF with two PUF functions can operate both in the SRAM mode and the inverter mode, and a PUF operating mode with higher reliability is selected for generating final responses.

Abstract: A vacuum-helium-leak-detection method based on a carbon-nanotube-based field-emission sensor that includes a carbon-nanotube-based cathode having a Raman amorphous peak ID/graphite peak IG ratio greater than 1.0. The method involves: setting a field-emission current at an initial, small emission current, recording an average of values of the field-emission current in a time period t, forming a sensing characteristic curve of the sensor, and performing fitting on the sensing characteristic curve so as to obtain an index curve; converting pressure values of helium gas into vacuum leak rates; and packaging the cathode into a vacuum chamber in a system to be detected, performing testing when a helium stream in the system to be detected reaches balance, obtaining an average of current variations in the time period t during the testing, and comparing the average with the index curve so as to determine a vacuum leak rate of the system to be detected.

Abstract: The present invention discloses a highly reliable positive-to-negative voltage conversion circuit, including a first inverter, a first buffer, a second buffer, a first to seventh NMOS transistors, a first to third PMOS transistors, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein the third PMOS transistor, the third NMOS transistor, the fourth NMOS transistor, the fifth NMOS transistor, the sixth NMOS transistor and the seventh NMOS transistor form an on/off control circuit, with that a power supply path between a positive-voltage power supply terminal and a negative-voltage power supply terminal is physically isolated by the on/off control circuit to eliminate voltage reversing occurring when the positive-voltage power supply terminal and the negative-voltage power supply terminal cannot be synchronized during power-on.

Abstract: A confined silica/multi-walled carbon nanotube composite material, its preparation method, and application are provided. The preparation method includes the following steps: S1: dispersing multi-walled carbon nanotubes in a methyl-substituted benzene solvent and subjecting them to ultrasonication for 10 minutes at room temperature; S2: after the completion of ultrasonication, adding liquid silicon tetrachloride to the multi-walled carbon nanotube/xylene suspension and continuing ultrasonication for 10 minutes at room temperature; S3: heating the mixture in an oil bath to 145° C. and performing reflux; S4: after the reaction is complete, naturally cooling to room temperature, centrifuging, washing, and drying the obtained solid to obtain a dry sample, thereby obtaining the confined silica/multi-walled carbon nanotube composite material.

Abstract: A leakage measurement error compensation method based on cloud-edge collaborative computing is implemented on a communication network formed by an interconnection between a leakage current edge monitoring terminal and a power consumption management cloud platform. The method includes the following steps: iteratively training, by the power consumption management cloud platform, a pseudo-leakage compensation model by using the received leakage current data, continuously updating pseudo-leakage model parameters, and feeding the pseudo-leakage model parameters back to the leakage current edge monitoring terminal; and processing, by the leakage current edge monitoring terminal, the leakage current data according to the pseudo-leakage compensation model parameters.

Abstract: An optical fiber multi-parameter sensing system and method are provided. The optical fiber multi-parameter sensing system comprises a light source, an optical circulator, a fiber-tip probe sensor and an optical spectrum analyzer, wherein the fiber-tip probe sensor can be placed into an analyte without changing the characteristics of the analyte. The variation of a bulk parameter that is a bulk refractive index of bulk environment around the fiber-tip probe sensor and a surface parameter which is a thickness of surface dielectric layer of the fiber-tip probe sensor can be determined simultaneously by monitoring the changing of resonance intensity and resonance wavelength of a single fiber-tip leaky mode resonance. The sensing system optionally configured such that multiple parameters in the analyte around the fiber-tip probe sensor can be obtained by detecting a single resonance peak.

Abstract: A machine learning attack resistant strong PUF with a dual-edge sampling function comprises switch units, a first arbiter and a second arbiter. The first arbiter is for determining a sequential order of delays at a rising edge of signals input to a first input terminal and a second input terminal of the first arbiter. The second arbiter is for determining a sequential order of delays at a falling edge of signals input to a first input terminal and a second input terminal of the second arbiter. Each switch unit is composed of eight MOS transistors. The strong PUF has a high capacity to resist machine learning attacks and small hardware expenditure through simple structural design of the switch units, realizing machine learning attack resistance and small hardware expenditure at the same time, and generating a large number of challenge response pairs through dual-edge sampling realized by the two arbiters.

Abstract: A PUF circuit based on the threshold loss of MOSFETs comprises N stages of delay units and an arbiter. Each stage of delay unit comprises six inverters and four MOS transistors, wherein the four MOS transistors are all PMOS transistors or NMOS transistors. Each path in each stage of delay unit uses only one PMOS or NMOS transistor and does not use a transmission gate formed by a PMOS transistor and an NMOS transistor. Therefore, it reduces hardware cost. Each MOS transistor on the transmission path has a threshold loss, PMOS and NMOS transistors in a third inverter and a sixth inverter are in an on-state, and output terminals of the third inverter and the sixth inverter will be charged to a high level or discharged to a low level, thus greatly increasing a delay difference between two square signals and enhancing randomness.

Abstract: A PUF-based magnetometer with a safety protection circuit is provided. The PUF-based magnetometer includes a TMR magnetometer main structure, a control circuit, a column encoder circuit, a row encoder circuit, a multiplexer and a dynamic comparator. The TMR magnetometer main structure includes n*n TMR sensors, and the TMR magnetometer main structure can also form a PUF circuit together with a control circuit, a column encoder circuit, a row encoder circuit, a multiplexer and a dynamic comparator to realize a function of a TMR magnetometer. The PUF circuit generates PUF response signals based on random deviations of a TMR sensor fabrication process. The PUF response signals generated by the PUF circuit make it more difficult for attackers to locate specific positions of the TPR sensors, and even make it hard to know the existence of the deviations of the TMR sensors.

Abstract: A double-robotic-arm collaborative flexible assembly system and method for disordered circuit breaker parts is provided. The system includes a target detection positioning module, configured to process an image of various types of circuit breaker parts disorderly placed in a loading tray, and determine spatial pose information and type information of the circuit breaker parts; an intelligent obstacle avoidance grabbing module, configured to determine an optimal obstacle avoidance path, clamping jaw types, and a moving instruction; and a double-robotic-arm flexible collaborative module, configured to determine an optimal double-robotic-arm collaborative technology by using a trained double-robotic-arm collaborative technology decision-making model according to the type information of the target circuit breaker part, and then place the target circuit breaker part into a loading mold.

Abstract: The present disclosure provides an optimal current selection method for a hybrid parallel integrated power supply, including the following steps: selecting multiple power device combinations with different current ratios, the combinations being formed by silicon insulated-gate bipolar transistor (Si IGBT) and silicon carbide metal-oxide-semiconductor field-effect transistor (SiC MOSFET) devices; comparing cost and junction temperatures on the Si IGBT devices and the SiC MOSFET devices under the different current ratios; comparing efficiency of a hybrid parallel integrated power supply with the different current ratios under different SiC MOSFET switching frequencies; comparing electromagnetic interference (EMI) noise of the hybrid parallel integrated power supply; selecting an optimal current ratio for the hybrid parallel integrated power supply.

Abstract: Disclosed is a control method for a hybrid parallel integrated power supply. Under the condition of a 2:1 current ratio between a Si-based inverter and a SiC-based inverter, an optimal power ratio between the two inverters is obtained by reducing a power loss of a fundamental wave component on the Si-based inverter. Based on the fitting for effective values of a harmonic current on the Si-based inverter, an optimal switching frequency of the Si-based inverter and a relationship between a minimum harmonic-current conduction loss and a switching loss under the optimal switching frequency are obtained. Zero sequence components of the current are eliminated through rapid switching of the SiC-based inverter, to suppress harmonic waves.

Abstract: A device encrypted authentication method based on a strong physical unclonable function is disclosed, including: generating ? matrixes formed by random transformation of a ??{square root over (b)}?-order unit matrix, such that unnecessary device expenditure is reduced; when a sensing device is identified, information to be synchronized between the sensing device and a back-end server is transmitted in the registration phase, such that an attacker cannot obtain confidential information in the encryption phase, and the attacker cannot traverse or completely crack all these possible combinations in a short time; even if the attacker intercepts some CRPs, it is scarcely possible that data sent by the sensing device matches the CRPs collected by the attacker, and with the increase of the number b of bits of challenges and the quick convergence to 0, the accuracy of random guessing is only 50%.

Abstract: A device for extracting polysaccharide from Acaudina molpadioides is provided, which includes a mixing box, a blocking cover, a feed pipe group, a discharge pipe, a bottom plate, a side plate, a first motor, a first transmission shaft, two drive shafts, a first circular gear, two second circular gears, two rotary discs, two connecting frame groups, two semiarc rotary discs, a slide bar, a stop collar, a fixed link, a baffle, a first bushing group and a first sleeve spring group. A top side wall and a rear lower side of the mixing box are communicated with the feed pipe group and the discharge pipe, respectively. Front side and rear sides of the slide bar are longitudinally connected with multiple first engaging teeth. Both the two semiarc rotary discs are connected with multiple second engaging teeth. The fixed link is connected between the stop collar and the slide bar.

Abstract: The invention discloses a challenge screening method for improving the stability of a strong Physical Unclonable Function (PUF). If the stability of the group of challenges (GOCs) is quantized by 1 or 0, the GOCs are defined as stable challenges or unstable challenges respectively; the GOCs and the stability of corresponding responses are defined as a challenge-stability pair (CSP); a machining learning training dataset is constructed through CSPs for obtaining a screening model, to associate the challenge stability with the screening model; during actual application of the strong PUF, the challenge stability of a strong PUF is determined through the screening model, and stable challenges of the strong PUF are screened out to form a stable challenge set, which is input into the strong PUF to extract identity information. The challenge screening method can effectively improve the stability of various strong PUFs and has better effect with external disturbance increasing.

Abstract: Disclosed is a method for solving parameters of extension/compression springs by an AC salp swarm algorithm, including the following steps. Determine design parameters to be solved of an extension/compression spring. Construct an objective function for solving the design parameters of the extension/compression spring based on a design objective of the extension/compression spring, wherein the design objective of the extension/compression spring is to minimize the weight of the extension/compression spring. Determine constraints of the design parameters of the extension/compression spring. Perform iterative optimization on the design parameters of the extension/compression spring using an AC salp swarm algorithm to obtain a globally optimal solution, and output the globally optimal solution as solved design parameters of the extension/compression spring, wherein the AC salp swarm algorithm is obtained by adding an AC operation between individuals during an iteration process of an existing salp swarm algorithm.

Abstract: The present disclosure relates to a subtle cornea deformation identification method and device based on a pixel-level corneal biomechanical parameter, including the following steps: step 1, sampling and analyzing a dynamic video of corneal stress deformation in a historical database, and calculating pixel-level data; and step 2, configuring an ensemble classifier based on a sampling result and detecting a local change in corneal biomechanics, thus identifying a subtle cornea deformation. The present disclosure has high measurement accuracy and is capable of detecting a local subtle biomechanical change.

Abstract: Disclosed is an imaging device for AMI diagnosis includes a first polarizer is arranged in an imaging part and a second polarizer is arranged in a light source part. These two are linear polarizers, and the polarization directions of the first polarizer and the second polarizer are perpendicular to each other. During the imaging process, a near-infrared beam emitted from a near-infrared light source is modulated into a linearly polarized light with a certain angle when passing through the second polarizer. Then, it is irradiated onto a subject and the light is reflected due to the specular reflection effect of the subject turns into a cross-polarized light when passing through the first polarizer. The linearly polarized light perpendicular to the polarization angle of the first polarizer is intercepted, that is, the reflected light is intercepted.

Abstract: Disclosed is a TFET with an OR-AND logic function. By arranging a horizontal channel and a vertical channel in different directions, three gates are not connected and will not be affected by each other, and can control the current of a whole channel jointly; when a first gate and a second gate are both at a high level, the TFET will be turned on, and when the first gate and a third gate are both at a high level, the TFET will also be turned on; the horizontal channel not only isolates the second gate from the third gate, but also reduces the strength of coupling between the second gate and the third gate, so only a small current passes through the horizontal channel when the second gate and the third gate are both at a high level, and the TFET will not be turned on at this moment.