An interpenetrating polymer network (IPN) hydrogel was prepared by using polyvinyl alcohol (PVA), polyacrylamide (PAM) as raw materials and glutaraldehyde as cross-linking agent. The structure of the IPN was characterized by Fourier transform infrared spectroscopy. The effect of PAM content, the amount of cross-linking agent, adsorption time, pH and adsorption temperature on swelling degree and Cu²⁺ adsorption properties of IPN hydrogel were studied. The Cu²⁺ adsorption kinetic characteristics of the IPN and the adsorption mechanism were investigated. The results showed that the 30wt.% PAM IPN had better Cu²⁺ adsorption property than PVA hydrogel when the pH was 5. The equilibrium adsorption amount of Cu²⁺ on PVA-PAM IPN hydrogel increased with the increase of temperature. The adsorption behavior was consistent with the pseudo-first-order and pseudo-second-order kinetic equations, and the mechanism diffusion was controlled by particle and film diffusions.

Ag₃PO₄/GO photocatalysts with spherical and cubic surface structures were synthesized via ion exchange method using graphene oxide (GO) as a carrier. The properties of Ag₃PO₄/GO catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The capability of the catalysts was evaluated by rhodamine B (RhB) degradation experiments. The results showed that under the same conditions, 98.5% of RhB was removed by cubic Ag₃PO₄/GO in 100 min, which was significantly higher than that of pure spherical Ag3PO4 (83.8%) , cubic Ag₃PO₄ (88.1%). Moreover, the cubic Ag₃PO₄/GO catalysts exhibited perfect stability in photocatalytic degradation, and the removal rate of rhodamine B could still reach more than 95% after five reaction cycles.

To establish an HPLC method for the simultaneous determination of rhein, emodin, chrysophanol and physcion in Niuhuangqingwei pills. Methods: Diamonsil C18 (250 mm×4.6 mm, 5 μm) at 30 ℃ was used with methanol and 0.1% phosphoric acid (75: 25) as the mobile phase, the flow rate was 1.0 ml·min-1 and the detection wavelength was 254 nm. Results: The linear ranges of rhein, emodin, chrysophanol and physcion were at 22.68-113.40 μg·mL-1(r=0.9991), 6.25～31.24 μg·mL-1(r=0.9996), 14.74～73.68 μg·mL-1(r=0.9990) and 5.22～26.12 μg·mL-1(r=0.9999) respectively, the average recoveries (n=6) were 99.9%（RSD=1.2%）, 99.9%（RSD=1.9%）, 100.0%（RSD=1.2%） and 99.8%（RSD=1.8%).

Hydride generation-atomic fluorescence spectrometry (HG-AFS) was used to determine the content of selenium in Ligusticum chuanxiong. The sample of Ligusticum chuanxiong is digested by nitric acid, and the content of selenium is determined by HG-AFS with potassium hydroxide and potassium borohydride used as reducing agents. The analysis method of the hydride - atomic fluorescence spectrometry determination of selenium in Ligusticum chuanxiong was established. Under the optimum working conditions, the selenium contens express a good linear relationship in the range of 0-15 ng/mL. The standad curve equation is y=0.78x+31.35 with the correlation coefficient is 0.9902 and the detection limit is 0.96 ng/g.The selenium content in Ligusticum chuanxiong is 1.354 ng/g. This study can provide a scientific information for the determination of selenium and the evaluation of Ligusticum chuanxiong.

Exploring the effects of different ancillary methods on the extraction rate of total polyphenols from Fruit of Rosa davurica Pall(FRDP). The optimum conditions for extracting the total polyphenols from FRDP were obtained by single factor and orthogonal experiments: the ratio of material to liquid 1:50 (g:mL), the extraction solvent was 50% ethanol solution, the extraction temperature was 80 °C. After extraction for 1.5 h, the total polyphenol extraction rate was 11.28 mg/g. Then the effects of ionic liquid assisted, ionic liquid synergistic ultrasonic assisted, ionic liquid synergistic ultrasonic-microwave assisted extraction on the extraction rate of total polyphenols from FRDP were investigated. The results showed that the extraction rate of total polyphenols from the ionic liquid was improved by 14.98% compared with the traditional solvent method. The ionic liquid was assisted by ultrasonic-assisted extraction. The extraction rate of total polyphenols in FRDP was increased by 16.13%. The extraction rate of total polyphenols in FRDP was increased by 20.66% by ionic liquid combined with ultrasonic-microwave assisted extraction. The above results indicated that ionic liquid assisted, ionic liquid synergistic ultrasonic assisted, ionic liquid synergistic ultrasonic-microwave assisted can increase the extraction rate of total polyphenols from FRDP, and provide a test reference for the subsequent development and utilization of total polyphenols.

The snowfall in winter in northern China has a long time, a large amount and a wide range. If the snowfall can not be cleared in time, it will greatly affect the normal life of people in the northern region, and the sudden snowstorm will also cause major security risks and affect social production. For this reason, this paper developed a machine that can realize road snow cleaning and make bricks from snow. In order to design it reasonably, the working performance standard is planned and designed. The motor speed of the compressor unit is 20R / min, the motor power is 1.05kW, and the vehicle speed is 0.17m/s. At the same time, the theoretical analysis and ADAMS simulation analysis of the core snow compaction unit are carried out, and the conclusion is that the device can meet the requirements of travel and cycle, and the compression moment can meet the performance requirements.

In order to solve the needs of snow and ice enthusiasts for ski instructors, a smart ski instructor system based on STM32 is designed. The zero-moment point balance method is used to evaluate the user's real-time skiing status, and the decision-making generates appropriate skiing instructions. The simulation experiment shows that the system can realize real-time attitude acquisition, dynamic evaluation and advance decision-making, and provide users with stable and reliable ski guidance.

In order to avoid the obstacles of branches or wires, improve fishing efficiency and increase fishing fun, a trigger ejection intelligent fishing device is developed. The device adopts the way of multi-level expansion bar, uses the energy release after the compression spring is triggered to automatically eject, and realizes the linkage and quick launch of multi-level expansion bar. The front end of the device integrates a micro camera to automatically collect underwater capture status during the rotation of the rotating platform, and provides information for users through the display screen. The image information is processed by the controller to control the rotation of the rotating platform, setting out wires and fishing motor of the platform, so as to realize intelligent fishing. In this paper, the theoretical calculation and experimental demonstration of the retractable mechanism of the fishing rod are carried out. Through the simulation of the speed of the retractable fishing rod, the effect of the fishing device with the fishing rod in the range of 1780mm is achieved.

Aiming at the problem that large-scale snow-removing machines in small areas such as residential campuses cannot enter into operations, a small and intelligent multi-rotor centrifugal snow-throwing is designed. The snow-throwing machine consists of four parts: snow-collecting system, snow-throwing system, power system and intelligent control system. The snow-throwing machine that is equipped with multiple centrifugal rotors can reduce blind areas and improve snow-removing efficiency. The intelligent control system can reduce the loss of ground obstacles to shoveling snow slurry and increase the service life of machinery. The snow thrower is compact in size and more flexible in use, which can meet the needs of small areas such as families and parks.

To solve the problem that dragon boat athletes cannot train on land, a training device for double dragon boat is proposed, which consists of a safety balance frame, a boat body, a paddle training device and a simulated water surface device. The trainer uses the wind wheel rotation to provide resistance, simulates the motion posture of the double dragon boat rowers in the water, and guides the boat through its own path with the guide rails to realize the function of the height change and left-right swinging of the dragon boat in the water, so as to meet the training requirements of the athletes on land.

In order to study the influence of the diffusion layer structure on the conductivity, drainage and gas conduction of the fuel cell, COMSOL Multiphysics was used to simulate and analyze the proton exchange membrane fuel cell. The variation of porosity of diffusion layer along thickness gradient, the mass transfer process by cathode side and the performance of fuel cell were simulated. The results show that the diffusion layer with gradient structure can reduce the occurrence of cathode water flooding, and the battery performance of the diffusion layer with gradient porosity distribution is better than that of the diffusion layer with uniform porosity distribution. At the same average porosity, the larger the gradient structure of porosity is, the stronger the drainage capacity of cathode side is, and the less residual liquid water is.

Lifting operation of large-scale offshore foundation piles is a difficult problem in the construction of offshore structures. In view of this situation, this paper takes IHC Company’s bilateral marine foundation pile hanger as the blueprint, and puts forward a structural scheme of "internal and external clamping type marine pile spreader" in order to improve the problems mentioned above. Aiming at the structure form of suspension proposed in this paper, by means of theoretical solution, simulation analysis and experimental research, the friction clamping and wedge tooth insertion clamping methods of suspension were studied and compared, and the bearing capacity of wedge tooth insertion clamping method of suspension is three times that of friction clamping method under the same transverse clamping load. The conclusion provides a reference for the selection of clamping mode of hanger in practical engineering application.

Image 3D reconstruction is widely used in reverse engineering, artificial intelligence and other fields. It is a hot research topic based on deep learning to reconstruct a 3D model using a single image. The article first reviews the research status of 3D reconstruction of single image, focusing on 3D-R2N2 based on voxel expression, PSGN based on point cloud expression, Pixel2Mesh based on monolithic grid expression and AtlasNet based on multi-piece triangle mesh expression. The algorithm analyzes the problem of different expressions of different tasks and output models through experimental comparative research.

Ball and plate system is a high order nonlinear system with the character of open loop instability. Based on the Lyapunov stability theory and dual closed-loop control strategy, a sliding mode variable structure position controller is designed, and the particle swarm optimization algorithm is used to optimize the sliding mode parameters with the aim of improving the control precision and reducing the sliding mode chattering elimination. Simulation results show that the sliding mode variable structure control algorithm has better tracking and robust performance compared with traditional dual closed-loop PID control.

The magnetic levitation ball system is a strongly nonlinear system with an open loop instability,and its control input and drive current must vary within a limited range.In order to make the output displacement reach the desired position,anti-windup variable structure PI controller is adopted in this paper to optimize the values of P,I andwith the combination of genetic algorithm,so as to make the ball reach the optimal position output.The experimental results show that,compared with the conventional PI controller,anti-windup variable structure PI control can track the desired position more quickly and stably,and the amplitude of oscillation is significantly reduced.

Aiming at the current situation that most hospitals still use private cloud with low computing resources, a medical big data processing system (BDPS) based on the workflow model is proposed and evaluated. Firstly, the contradiction between performance and cost in private cloud is studied. Secondly, the hybrid cloud is investigated to solve the above problems. Thirdly, a medical BDPS based on the workflow model is proposed, and the corresponding architecture and the workflow model are given also. The simulation results verify the rationality and validity of the proposed model.

Using sodium lignin sulfonate, urea, formaldehyde and Melamine as the main raw materials, a new type of environmentally-friendly sand fixing agent was synthesized to provide a new variety of sand fixing agent. The chemical composition analysis was carried out by FT-IR, the wind corrosion resistance, water retention, compressive strength and water resistance of sand fixing samples were measured, and the sand fixing effect of different concentration of sand fixing agents was analyzed. The results show that the new environmentally friendly sand fixation agent can bond the sand particles tightly to form a larger aggregate structure. The sand mold of the sand fixing agent sprayed 5%, the wind erosion rate of the sand fixing specimen reached 0.02 %, the water retention rate reached about 70 %, the compressive strength reached 25mm, and the water resistance reached 2.46 %, which can meet the actual application requirements.

A petroleum hydrocarbon degrading strain was screened from the soil polluted by petroleum in SongYuan oilfield, and was identified as Stenotrophomonas acidaminiphila strain by 16S rDNA sequence analysis. The effects of material water ratio， drying temperature, carrier ratio were investigated. The results indicated that the petroleum hydrocarbons degradation efficiency was best under the following conditions: water ratio 1:2，drying temperature 35 ℃ and the inoculants on carrier (rice husk, sawdust, diatomite) ratio 80%:10%:10%.

Tayloy formula is widely used in higher mathematics. On the basis of simple introducting Tayloy formula, Tayloy formula(containing Maclaurin and Lagrange) pplied to higher-order inequalities is researched through concrete examples, the proving step and Matters needing attention are  analysised accordingly in order to to provide the reference for the students to learn Tayloy formula.

Based on delayed-state-derivative feedback protocol with weighted terms, this paper investigates the problem of consensus for the first order multi-agent systems with sampled-data control. For the fact that multi-agent system is difficult to ensure continuous information transmission, the delay decomposition technique is applied to decompose the consensus protocol, and a discrete-time consensus protocol based on sampled-data is presented. Under the discrete-time consensus protocol, the necessary and sufficient conditions for the asymptotic average consensus of multi-agent systems are obtained. When the consensus protocol degenerates to a simple case, the necessary and sufficient conditions for the asymptotic average consensus of the systems are reduced to a set of inequalities. Finally, the validity of the conclusions is verified by numerical simulation.