The corrosion inhibition performances of three single-component corrosion inhibitors of polyepoxysuccinic acid (PESA), polyaspartic acid (PASP) and sodium gluconate (Glu) for carbon steel were tested by the static weightlessness method. Then the three agents were combined with each other in an orthogonal way to form a composite inhibitor of PESA/PASP/Glu with a high corrosion inhibition performance on carbon steel. Finally, the effects of the addition concentration, test the time, temperature and pH on the corrosion inhibition of the composite agents were investigated. The composite agents showed a corossion inhibition rate of 94.6% under the optimal concentration of 1000 mg?L-1. The corrosion inhibition rate decreased gradually with time but remained above 70% at 48 h. With temperature increased, the corrosion inhibition rate reduced slightly and still reached 86.5% at 80℃. Higher corrosion inhibition rate was found at higher solution pH. The corrosion inhibition rate is 96.5% at pH 12, almost completely inhibiting the corrosion of carbon steel. These results indicated that the phosphorus-free composite corrosion inhibitor was especially suitable for high temperature and high alkalinity system.

Transition metal borides have been used widely as multi-functional hard materials in industrial production. However, the crystal structure of some materials is still controversial. These materials can’t be distinguished by conventional test methods (XRD, EDS, etc.). The distinguished test method are complex and expensive. But, synthesizing pure phase materials is also a challenge, which  brings more trouble to the determination of the crystal structure of the sample. In this paper, WB₂ with controversial crystal structure was synthesized by high temperature and high pressure method. The crystal structure was determined to be WB₂ instead of W₂B₅ by the combination of theory and experiment. This method is important to determine the crystal structure of controversial crystal structure materials.

The parameter estimation of mixture of linear regression model with censored data is studied. The procedure of parameter estimation of mixture of linear regression model is established by EM algorithm. We collected data on GNP per capita and carbon dioxide emissions per capita in 28 countries in 2019.The mixture of linear regression model is used to fit for dataset of per capita GNP on carbon dioxide emissions and the dataset is analyzed, which provides the basis of the future development policies for some low GNP countries.

Uncertainty theory is playing a more and more important role in solving the financial problems. This paper investigates the uncertain financial market based on the uncertain exponential Ornstein–Uhlenbeck model. Geometric average Asian call option pricing formula and put option pricing formula are derived via the α-path method. Some mathematical properties of the uncertain option pricing formulas are discussed. Finally, several numerical examples are given.

Based on the neural network model, this paper studied the impact of the opening of urban residential areas on the surrounding road traffic. Firstly, the evaluation index system of the impact of the closed community opened on the urban road capacity is constructed, and the quantitative analysis is carried out by using SPSS and MATLAB. Four evaluation indexes are selected, including the number of paths, the area of the road infrastructure, the non-linear coefficient and the blocking rate of the intersection. The improved BPR model is established. Through the calculation of the traffic index, the opening of the closed community is studied to improve the surrounding roads. Finally, the feasibility of the model is verified by empirical analysis.

In this paper ANSYS Workbench platform is used for static and dynamic finite element analysis of the battery enclosure, and the weak position of the box structure is obtained, then emboss structure is designed on the surface of the upper cover for local reinforcement. Based on the topography optimization technique of the Optistruct software, the geometric parameters and plane layout of the enclosure structure are obtained by optimizing the local stiffness of the upper cover , final the three-dimensional model of the optimized upper cover is established. It is verified that the maximum deformation of the upper cover is reduced by 71.73% and the first natural frequency has reached the design requirement, the stiffness of the upper cover is improved significantly, which lays the foundation for further research on the actural structure of battery pack enclosure.

Based on the important role of distribution center location planning in the operation of the third-party logistics enterprises, this paper analyzes the problems of distribution center in S city of Y logistics company by taking the distribution center in S city of Y logistics company as an example, studies the location of distribution center by using analytic hierarchy process, establishes the hierarchical structure model and judgment matrix through qualitative analysis and quantitative analysis, so as to determine the optimal location. And then this paper provides reasonable suggestions for the location of the distribution center of the third-party logistics enterprises in order to improve the operation efficiency and reduce the distribution cost of the enterprise.

According to the relationship between the load and the relative axial deformation value of the diaphragm spring, six important characteristic parameters are analyzed by using MATLAB, including the height of the internal truncated cone of the disc spring in the free state, thickness of steel plate, radiuses of large and small end of disc spring part without any force, the radius of pressure plate loading point and loading point of support ring. The influences of characteristic parameters on the performance of diaphragm spring are summarized. The optimization of a diaphragm spring improves the performance of the clutch and prolongs the abrasion limit of the clutch.

Taking the dragon-boat trainer with wind resistance as the research object, the characteristics of the force variation during rowing and the working principle of the trainer were analyzed. Firstly,the force analysis of the blade into the water during the rowing process was carried out, and the relevant resistance calculation was carried out. The CFD technology was used to verify the calculation results, Then through the comparison with the traditional dragon boat training mode, strive to maximize the simulation degree of water sports, the use of wind resistance to simulate the blade in the water stress state, in order to achieve the purpose of simulating the rowing training movement and effect.

In the era of new media, there are great changes in information disclosure in colleges and universities. Through the analysis of the characteristics of enterprise WeChat, the author constructs the university information disclosure platform based on enterprise WeChat, and introduces and analyzes the application of the platform.

The resistance furnace temperature tracking control system based on Siemens S7-200 PLC was developed to solve the problem of temperature tracking control precision of resistance furnace. The constant temperature value PID control program and the temperature segmental setting tracking program were compiled. Through the touch screen interface, the temperature rise curve can be easily set and the actual temperature trend data can be displayed in real time. After the actual operation test, the PID temperature control algorithm has proven a good control effect, and each control indicator can meet the on-site process requirements.

Aiming at the problem of low interest and low accuracy of traditional recommendation algorithm, this paper proposes a new recommendation algorithm based on implicit model. Firstly, we collect the feature values of the implicit model data to obtain the user's personalized preference information, and then judge and classify the relevance values of different information according to the collected feature data and search keywords. On this basis, according to the results of judgment and classification processing, different levels of information are recommended and sorted, and the steps of model information recommendation are optimized to realize the recommendation of implicit model information. The experimental results show that the user interest value of the recommendation algorithm based on the implicit model is higher than other traditional recommendation algorithms, and the accuracy of information recommendation is higher.

The increase of communication interference signals has seriously affected the normal communication of multi devices in the Internet of things. Therefore, an independent component analysis based method for interference suppression of multi devices in the Internet of things is proposed. The interference signal of the multi equipment communication system of the Internet of things is transformed into comb jamming signal through comb filter and power amplifier. The independent component analysis of the interference signal is realized through the mixed model, Unmixing Model and assumption conditions of the independent component analysis, and the frequency hopping signal and comb jamming signal of the multi equipment of the Internet of things are separated to achieve interference suppression. The experimental results show that this method has good separation effect on mixed signals and can effectively suppress comb blocking interference in multi device communication of the Internet of things.

In the whole process of coal mining, hydraulic support, as the supporting equipment of coal mining, its high strength and high safety directly determines the production safety of coal mining operations.It is found that the shield beam is the weak part of the hydraulic support, especially when the top beam is subjected to torsion load.This paper cover beams under torsion load the statics analysis and topology optimization analysis, and based on this, advances the structure optimization, and the optimized scheme under the same conditions of statics analysis. Compared with the analysis results of the optimization scheme, it is shown that the maximum stress is reduced by 24.46%, while the weight is reduced by 194kg, the maximum displacement is also reduced, and the optimization result is the most ideal. Provide the technical support for the overall optimization of hydraulic support, complete the reinforcement structure overall lightweight design targets at the same time.

The Four-axis machining center needs to play its processing advantages, and it can not be separated from the matching four-axis post-processing software; the tool position data generated by NX can be generated after post-processing analysis to generate NC code. The main contents of this study include: the use of D-H parameter method to design the post-processing algorithm of " Four-axis machining center with A turntable"; the post-processing program based on UG Post Builder is studied, and Vericut is used for simulation verification.

A series of polyurethane / melamine-formaldehyde resin interpenetrating network rigid foam was synthesized by stepwise IPN method. It was characterized by apparent density, compressive strength, bending strength, flame resistance and cell structure. The results showed that with the increase of polyurethane content, the apparent density of foam plastics decreased, and the mechanical properties of foamed plastics were improved effectively. However, after adding 20%  polyurethane, the mechanical properties were not obviously increased , and the foams changed from high inflammable materials, inflammable materials to flammable materials.

In order to analyze the influence of different contents of silica powder and polypropylene fiber on the crack resistance of regenerated concrete beams, ANSYS finite element analysis was carried out on the crack load, ultimate load, stress distribution and load-deflection curve of 5 regenerated concrete beams. The results show that the addition of silica powder and polypropylene fiber increases the strength and overall stiffness of the recycled concrete, improves the tensile stress resistance of the beam, enhances the crack resistance, improves ductility, and increases the cracking load and ultimate load. When the content of silica powder was 8% and the content of polypropylene fiber was 0.9kg /m3, the cracking load and ultimate load of the specimen reached the maximum value of 23.66kN and 128.5kN respectively, which were more than 20% higher than that of SF₀P₀.

Heat transfer printing ink is a key element in the field of heat transfer printing technology. In order to make the heat transfer printing technology compatible on different fabrics, it is necessary to study the rheological properties and printing adaptability of the ink coated on the paper base surface. It is necessary to transfer the oil which can be transferred to chemical fiber and natural fiber fabrics by digital printing or screen printing and other technical methods The ink is transferred to the transfer paper and then to the corresponding fabric. Through experiments, the rheological properties of heat transfer ink were analyzed, the ink density and transfer paper were measured, and the relationship between ink and printing compatibility was found out.

According to the meteorological, wind, rain, and water data provided by the China Meteorological Station and the National Climate Center and the Zhejiang Meteorological Bureau during the Typhoon Liqima, three disaster chain modes are constructed: typhoon-rainstorm, typhoon-gale and typhoon-storm surge. Using case analysis method, the analysis the disaster of Typhoon "Lichma" .The results shows that Typhoon "Lichma" appears to have the characteristics of strong landing intensity, wide influence range, low central pressure, salient extreme, slow moving speed, long land residence time, and high wind and rain intensity. This three disaster chains together lead to secondary disasters such as flash floods, landslides, giant waves, seawater inversion, and seawater accumulation, making the cumulative impact of the disaster far outweigh the impact of the disaster caused by a single disaster, causing a large number of casualties and great economic losses.Countermeasures for disaster reduction in coastal, mountainous, and plain areas in response to typhoon disasters are provided.

The work of ensuring the safety of hazardous chemicals is of great importance the sound operation of university laboratories . As the main place for storing hazardous chemicals in colleges and universities, hazardous chemicals warehouse should be safeguarded in all aspects so as to effectively avoid hazardous chemicals accidents, thus ensuring the safety and stability of university laboratories. The hazardous chemicals in colleges and universities are usually being stored with rich categories and small amount, and being used frequently. According to these features and the requirements of the safety work of hazardous chemicals warehouse in colleges and universities, the research is carried out from the perspectives of location,design and regulation of hazardous chemical warehouse, which is of great significance to ensure the safety of life, the property of the school and the orderly operation of teaching.