The main purpose of grafting maleic anhydride on polyolefin molecules is to increase the polarity of the molecule. After comparing multiple treatment methods, a new two-dimensional method represented by associative force parameters and solubility parameters was proposed to treat the solubility data of propylene butene copolymer modified by maleic anhydride grafting. The associative force parameters of the solvent can be calculated using Hansen’s three-dimensional solubility parameters. It turns out that the shape of the soluble area is an ellipse, and this ellipse can be used to represent the range of polymer solubility parameters. The association force parameters of PPB-MAH can be used to quantify its molecular polarity, and the elliptic equation can be used as a prediction of solvent solubility.

The optimal process conditions were obtained by investigating the electrolytic temperature, acid concentration, molar concentration of raw materials and oxygen temperature in the process of indirect electrooxidation to benzaldehyde. That is, the electrolysis conditions are: sulfuric acid concentration 8.0 mol· L-1, temperature 323 K; The oxidation conditions of toluene were: sulfuric acid concentration 8.0 mol· L-1, temperature 333 K. not only keeps the acid concentration consistent in the two stages of electrolysis and oxidation in the indirect electrooxidation process, but also increases the current efficiency of the electrolysis process by about 13.22%, and the benzaldehyde yield of the toluene oxidation reaction increases by about 6.67%.

Through the analysis of the flow behavior of plastic melt in the cavity, the functional relationship between the flow length and cavity thickness of the front peak melt in a given time period under isothermal conditions is established based on reasonable assumptions, and a method for quickly predicting the melt filling mode is proposed, namely the equivalent flow length method. This method converts the tracking problem of the peak surface before the melt into the solution of the approximate shortest path between any two points on the weighted surface. Short-shot experiments show that the filling mode predicted by the algorithm is in good agreement with the filling mode of the actual product.

The phenylene acrylic emulsion was modified with octamethylcyclotetrasiloxane, vinyl cyclotetrasiloxane and propylene trifluoroacetate, and the appropriate amount of modified monomer and the silicone/fluorine ratio were determined. The infrared spectrum of the emulsion showed that the silicone/fluorine-modified styrene acrylic emulsion was obtained. The effects of silicone and fluorine on the stability of polymerization system, the performance of emulsion coating film and reaction speed were studied. The results showed that with the increase of the content of modified monomers, the reaction speed decreased. When the mass fraction of modified monomer in the control system ≤15%, the ratio of octamethylcyclotetrasiloxane, vinyl cyclotetrasiloxane and propylene trifluoroacetate had no effect on the stability of the emulsion.

The phase diagram of the ternary system Na2SO4-H2O2-H2O was analyzed, and the synthetic Na2SO4· H2O·0.5H2O2 suitable raw material ratio. According to this phase diagram, sodium sulfate hydrogen peroxide adduct Na30SO2· was prepared by using hydrogen peroxide with a mass fraction of 4%. H2O·0.5H2O2, the content of H2O2 is 9.48%, which is close to the theoretical content of 9.6%. Na4704SO2· The infrared spectrum of H4O·2.0H5O2 was determined on the D/MAX-2B X-ray diffractometer (RIGAKU), and the X-ray powder diffraction pattern was determined as Na3SO2· The in-depth study of H4O·2.0H5O2 provides a basis.

Due to the diversity of boundary conditions, the complexity of the internal force distribution in the plate is caused by the diversity of boundary conditions, and the existing solution has the shortcomings of inconsistent calculation methods, low calculation accuracy and small application range. The proposed precise solution divides the bending of the plate into two categories: generalized static determination and generalized superstatic determination, for the former, a unified general solution expression is proposed and a combined special solution is adopted, which can not only meet the plate bending balance emblem division equation, but also meet the deflection conditions of the supporting edge, the shear distribution conditions on the free edge, the concentration force conditions of the free angle point and the reaction force conditions at the column support, so that the four-sided boundary conditions and the displacement conditions at the column support can be used to solve directly. For generalized superstatically definite bending, the superposition method is used to solve it. The reverse analysis example shows that the solution has high computational accuracy.

The pile anchor support structure mainly relies on the anchor prestressed bearing and significantly reducing the lateral shift of the pit wall, and the soil nail support mainly relies on the strengthening of the soil of the pit wall to reduce the pressure and bearing on the soil side, and organically uniting the two into a common bearing whole is a commonly used structural form in the current foundation pit support engineering. Under the action of earth pressure and ground overload on the pit wall, the pile anchor and the soil nail work together to resist the load and deformation, but the available space of the foundation pit support structure in the actual project is often limited by the site. According to the force characteristics, construction characteristics and corresponding requirements of the design code of the joint support structure of pile anchor and soil nail, considering the coordination relationship between the length of the free section of the prestressed bolt and the straight fracture surface of the soil nail, and according to the principle of total anchoring force equivalence, the design and calculation method of the restricted joint support structure is studied, which has certain theoretical guiding significance for the support and excavation of foundation pit engineering limited by site conditions.

Combined with the actual project of Yangjialing spillway gate pier, the relevant mechanical properties of gate pier concrete based on temperature control index were experimentally studied. The test results show that the addition of an appropriate amount of polypropylene fiber (0.9 kg/m3) can significantly improve the crack resistance of the gate pier concrete. For hydraulic projects lacking test data, the compressive elastic modulus of concrete of other ages can be calculated according to the compressive elastic modulus of 28 d age concrete, and the compressive elastic modulus of concrete can also be calculated according to the cubic compressive strength of concrete.

Based on the Mononobe-Okabe hypothesis, the horizontal layer analysis method is used to establish the first-order differential equation of the active earth pressure intensity under the translational mode of the rigid retaining wall under seismic loading, and the nonlinear distribution solution is obtained. The resulting resultant force formula is exactly the same as the Mononobe-Okabe formula. The analysis results show that the seismic coefficient has a great influence on the distribution of earth pressure intensity. In addition, by discussing the influence of the internal friction angle of the fill, the friction angle of the wall back and the seismic coefficient on the height of the active earth pressure resultant action point, it is considered that the Mononobe-Okabe theory is dangerous for the overturning stability of rigid retaining walls in translation mode.

The explosion of conventional ammunition near a nuclear power plant may cause damage to the main structure of the nuclear power plant. In order to evaluate the anti-explosion performance of the containment barrel wall, according to the resistance design curve of the structure, a new method for judging the explosion resistance of the simple support wall is proposed, and taking the reinforced concrete wall in the nuclear power plant as an example, the maximum incident pressure and explosion safety distance that the simple support wall can withstand are given, when the ductility coefficient is 3, the wall thickness and reinforcement ratio are the same, the design resistance is doubled, and the minimum safe explosion distance of the simple support wall is reduced by 12%; The resistance and reinforcement ratio are the same, and the minimum safe explosion distance of 600 mm thick is reduced by 450% compared with 3 mm thick simple support wall.The calculation results show that the design resistance, wall thickness and reinforcement ratio have different effects on the maximum overpressure value that the simple support wall can withstand and the minimum safe explosion distance without damage. This method and calculation results can be used to make a preliminary judgment on whether the safety of nuclear power plants can be guaranteed after an attack.

According to the mechanical properties of fiber-reinforced plastic reinforcement (FRP bar) and its concrete beam, the expression of the cross-sectional curvature of the fiber-reinforced plastic reinforced concrete beam to achieve the nominal yield strength of the fiber-reinforced plastic reinforcement and the cross-sectional curvature of the final failure of the beam was established. Based on this, the calculation method of section curvature ductility of fiber-reinforced plastic reinforced concrete beams is discussed. The results show that the curvature ductility coefficient of fiber-reinforced plastic reinforced concrete beams increases with the decrease of the reinforcement ratio of fiber-reinforced plastic reinforcement and the increase of concrete strength, respectively.

Through the static load and repeated loading tests of eight partially shear connection composite beams, the effect of repeated loading on the stress performance of partial shear connection composite beams was studied on the basis of the analysis of the test process, test phenomenon and test results. The test results show that the partial shear connection composite beam under repeated load has good fatigue resistance. Under the condition that the welding quality is guaranteed, the fatigue failure of part of the shear connection composite beam under the fatigue load within the normal use range will hardly occur. Therefore, it is feasible to use partial shear connections in building structures and bridge structures to bear fatigue loads when necessary, and can bring good economic benefits.

Through the pull-out test of 72 HRB500 steel bar bonding and anchoring specimens, the bonding and anchoring performance of HRB500 steel bar was studied. On the basis of the test, the calculation formula of HRB500 steel bar bonding strength is given, and the anchorage length design suggestions of HRB500 reinforced concrete members are proposed on the basis of reliability analysis. The results show that the bonding and anchoring performance of HRB500 steel bar is the same as that of ordinary crescent rib steel bar, and its bonding performance increases with the increase of concrete strength. When c/d <4.5, the bonding strength increases with the increase of protection thickness and decreases with the increase of anchorage length. The anchorage length can be calculated according to the formula specified in the current < concrete structure design code > (GB50010-2002).

Starting from the actual characteristics of urban high-voltage power grid, the reduced-order enumeration method is used to determine the online operation grid of urban high-voltage power grid. The state of the switch is expressed as an integer variable, and the combination of all switching states constitutes a complete enumeration of the possible operation modes of the grid; After considering various practical grid operation constraints such as relay protection, the number of possible operation modes is greatly reduced; The accurate calculation of a limited number of operation modes ensures the optimality of the results and the rapidity of the calculation. This idea has been used to determine the post-accident recovery scheme, the current operation mode and the optimal grid operation scheme at any time in the future in the "intelligent decision support system of urban power grid". The actual trial operation of Nanyang urban power grid shows the effectiveness and practicality of the proposed method.

Aiming at the characteristics of large number, wide geographical distribution and strong layout dispersion of distribution transformers, GSM wireless communication is applied to power distribution and transformation power collection, and the automatic power distribution and transformation collection system is designed and realized. The acquisition terminal is designed with 89c51 single-chip microcomputer and wireless GSM module, and the master station is developed with VC++ and ACCESS. The system has low cost, good stability and good practical value.

A single-phase voltage type active filtering device (APF) based on DSP technology is introduced, and the main circuit structure, the calculation method of reactive and harmonic current to be compensated and the capacitor voltage stability control method of the device are expounded. The characteristics of DSP chip, the hardware structure of the device and the control strategy of the active filter device are analyzed, and the test results of the device show that the control strategy is feasible. The active filter device can be used for reactive power dynamic compensation of electrified railways, and can also be used for split-phase reactive power compensation and harmonic suppression of three-phase four-wire power grid.

Aiming at the measurement of test point electrode coordinates in biomedical signals, a new method of "contactless image processing" is proposed by taking brain wave testing as an example: the test image is obtained by a digital camera, and then the test point electrode information is extracted and separated by computer image, and then the data query comparison and linear fitting approximation are used to realize three-dimensional reconstruction. The experimental results show that 80% of the test points can meet the accuracy requirements, which is a useful attempt to realize the intelligence of "soft instead of hard" sensing.

The construction of the "Digital Yellow River" project aims to provide information services and decision support platforms for the Yellow River Basin to solve the three major problems of flood threat, contradiction between water supply and demand and deterioration of the ecological environment faced by the Yellow River Basin, and ultimately realize the long-term stability of the Yellow River and the sustainable development of the economy and natural environment of the Yellow River Basin. The digital Yellow River project is mainly composed of infrastructure, application service platform and application system. Through the construction of six application systems of flood prevention and disaster reduction, water quantity scheduling, water resources protection, water and soil conservation, project management and e-government, the implementation of the "Digital Yellow River" project will be fully promoted.

6061Al/SiCp metal matrix composites (MMC) were prepared by jet co-deposition method, and the thermal residual stress and damping performance under quenching state were simulated by finite element method, and the calculation results showed that there was significant residual tensile stress in the matrix material of the quenched sample, and the water quenched sample was higher than that of dry ice quenched sample, according to the dislocation damping mechanism, the tensile internal stress in the matrix would help the dislocation to start, thereby reducing the size of the critical strain amplitude. The strain amplitude correlation effect is improved, which is manifested as an improvement in the internal friction value. Finally, the experimental results verify the above theoretical analysis again.

After making the center curve and dot curve of Bourmeist, according to the kinetic requirements γmin>40°~50°, the crank slider mechanism is designed, the inflection point circle is found, and the relationship between slippage, guide inclination angle and inflection point circle is obtained. The position of the slider articulation point B1 is related to the β of the slide guide angle, while the inflection point circle K1 is independent of the β the slide guide angle. The inclination angle of the slider guide can be adjusted appropriately β and the inflection point circle is unchanged, and the position of point B1 is changed on the inflection point circle K1 to meet the design requirements. For the calculation example, when the value of A is <-17, the point on the center curve cannot be obtained, which is consistent with the theory of the Bulmeister center curve, that is, for any given four relevant positions in the plane of the connecting rod, only some corresponding center points can be found on the plane of motion of the connecting rod.

The theory and application of cylindrical error evaluation are studied, the planning model of cylindrical error evaluation is established, the minimum condition criterion for error evaluation is discussed, the modified simplex method for directly solving the programming model is proposed, and the steps of solving it are given. Finally, the error evaluation of the actual measurement data is carried out, and the results show that the method has high accuracy and speed. In addition, this evaluation method has strong versatility and provides a reference for solving other shape errors.

The semiparametric regression model YJ=XJΒ+G(TJ)+εJ,J=1,2,...,n was analyzed. where (xj,tj) is a fixed design with values on R×[0,1], β is an unknown parameter, g is an unknown function defined on [0,1], εj is random error, Eεj=0, Eε2j=σ21,...,,...,. Finally, the least squares method and moment estimation method are used to give the estimation of the α, β and pollution parameters of the two pollution modes under random truncation.

The overall error of curve elements is described by means of mean square calculus of stochastic processes, the specific index of overall error of curve is defined with the numerical characteristics of the process, and the geometric significance of error indicators is analyzed. According to the process model, the scanning digitization test of the overall error of the curve is designed, a road curve is interpolated with high density by tertiary parameter spline, the road centerline is repeatedly collected, and 100 sample curves of the random process are obtained through conversion, on this basis, the error index value is estimated, the smoothness of the process is discussed, and the causes of systematic error in scanning digitization and the corresponding methods to reduce systematic error are analyzed. The test data generally represents the accuracy of road centerline scanning digitization.

The pretreatment process and nickel plating liquid formula of magnesium alloy electroless plating were selected, and the coating test obtained by the process showed that the alloy had strong corrosion resistance, high hardness, dense structure, good gloss and certain ductility; The experimental results show that yttrium and europium have a greater influence on the stability of the plating bath, and ammonium fluoride and sodium carbonate have a significant effect on the plating speed, especially when the Y4+ concentration is 3.0 g/L, the stability of the plating bath is the most, while the acceleration effect of sodium carbonate is the most obvious at about 02 g/L. In this paper, their influence mechanism is analyzed.

This paper analyzes the development process of the mansion in Henan area, studies the Baiju Yilufang mansion in the Tang Dynasty, and tries to draw its plan, façade and bird’s-eye imaginary map according to historical records. The investigation visited three existing mansions (Liu Residence in Liujia Hutong in Kaifeng, Renjia Mansion in Yucheng County and the Former Residence of Wang Duo in Mengjin), and drew a plan and bird’s-eye view of the Quasishan Garden (the back garden of Wang Duo’s mansion) according to written records. Through the analysis of historical background and existing examples, and the comparison of Jiangnan private gardens, it is pointed out that although Henan’s ancient mansions are private gardens, their style is more inclined to the type of palace garden. In the composition, there is an axis treatment of shaping, and attention is paid to the use of mountains, stones, and water trees to find natural changes.

The thermal fatigue performance and high temperature oxidation performance of two materials commonly used in coal-fired boiler burner nozzles were studied by comparative test method, through thermal fatigue crack growth rate and oxidation weight gain test, and the results showed that the thermal fatigue performance and high temperature oxidation resistance of ZG40Cr26Ni4Mn3NRe, a new material with high content of chromium, manganese, silicon and other elements, were significantly better than those of the original burner nozzle material ZG40Cr20Ni5. Thermal fatigue cracks are most likely to appear at surface defects, and the formation and rupture of oxide film during thermal cycling intensifies the initiation and propagation of thermal fatigue cracks.