A new catalytic material aluminum nitride phosphate was prepared by reacting with ammonia at a high temperature of about 800 °C by reacting amorphous aluminum phosphate at a high temperature of about 0 °C. The effects of aluminum phosphate particle size, ammonia flow rate and nitriding temperature on the preparation were investigated. Experiments have found that the particle size of the material has a certain influence on nitriding, and this effect disappears when the particle size is less than 25.800mm.The nitriding process requires a large ammonia flow rate to ensure a faster nitriding rate. When the ammonia flow is low, the reaction speed is too slow and the nitriding time is very long. The nitriding rate accelerates with the increase of nitriding temperature. The experiment also found that there was a significant loss of phosphorus in nitriding at 5°C, and the nitriding began to decrease from 1 to about 0.75 at <> h, and then remained constant. A first-order epikinetic equation describing the change of nitrogen content of samples with nitriding time during nitriding was established, which could fit the experimental data well.

Asymmetric nanofiltration membranes were prepared by dry/wet phase conversion using polyetherimide (PEI) film-forming material, N-methyl-2-pyrolidone(NMP) as polar solvent, ethylene glycol dimethyl ether (DGDE) as volatile poor solvent, phosphoric acid (H3PO4) as non-volatile non-solvent, polyethylene glycol (PEG1 000) as additive, and water as gel medium. The main factors affecting the membrane performance were studied by uniform design method, and the regression equation of membrane performance was established, and the qualitative and quantitative relationships between membrane performance and various factors were obtained. Increasing the content of PEI, H3PO4 and DGDE in the casting film solution, or prolonging the evaporation time, can improve the interception performance of the membrane and reduce the water flux of the membrane. Increasing the content of PEG1000 can effectively improve the water flux of the membrane.

The conditions for the chromogenic reaction of the new chromogen 4-(2-thiazoleazo)-6-formyl-resorcinol (TARF) with lead were studied. In the borax-hydrochloric acid buffer solution medium with pH 7.5~8.0, TARF and Pb(II.) formed a stable violet complex with a molar ratio of 1:1, the maximum absorption wavelength was 565 nm, the apparent molar absorbance coefficient was 1.62×104L/(mol·cm), and Pb(II.) complied with Bill’s law in the range of 0~3.2 μg/mL. Under the action of a certain masking agent, the reagent can be used to determine the determination of lead in the standard sample of environmental water quality.

The adsorption and competitive adsorption properties of δ-type manganese dioxide on Cu2+ and Pb+ were studied, and the effects of pH, temperature, salt concentration, adsorption time and other factors on adsorption were investigated. The results showed that the adsorption capacity increased with the increase of pH value, temperature and salt concentration. The adsorption of Cu2+ and Pb2+ by manganese dioxide in a single system conforms to the Langmiur adsorption isotherm, and the △G° of the adsorption process is negative, and the △H° is greater than zero, indicating that the process is a spontaneous endothermic process. The adsorption process of manganese dioxide to Cu2+ and Pb2+ can be well described by the quasi-secondary reaction kinetic model. The presence of coexisting ions affects the adsorption efficiency of metal ions, and Pb2+ has a great influence on the adsorption of Cu2+. The adsorption order of manganese dioxide on Cu2+ and Pb2+ was Pb2+>Cu2+.

Under static test conditions, the treatment effect of zeolite on wastewater with high ammonia nitrogen content monosodium glutamate was studied, and the effects of different zeolite particle size, zeolite dosage and regeneration methods on adsorption were investigated. The test shows that the smaller the particle size, the stronger the adsorption capacity; After oscillation for 5 h of 270 g zeolite with a particle size of 833~2μm, the removal rate of ammonia nitrogen in wastewater reached 67.1%.Through the dynamic adsorption test, compared with the penetration curve before and after zeolite regeneration, it was found that the adsorption capacity after zeolite regeneration was almost the same as before regeneration, and the effective life was 151 h, which was only 17 h shorter than the life before regeneration.This shows that zeolite is an ideal denitrification adsorbent.

Wavelet transform has the ability to characterize the local characteristics of signals in the time and frequency domains, and can amplify and identify abrupt signals in structural responses at different scales. Based on the curvature mode, a beam structure damage recognition method based on wavelet transform is proposed. The wavelet transform of the curvature mode of the structure before and after injury is carried out by using the biorthogonal wavelet function, and the structural damage index is established through the change and distribution of the wavelet transform coefficient, which can determine the existence of damage, determine the damage location and estimate the degree of damage. The method is verified by numerical simulation of T-shaped cross-section beam in a simple supported beam bridge.

Compared with ordinary soil nail support, the cement-soil pile composite soil nail support system has the dual functions of water stop and foundation pit side wall support, which can reduce the lateral shift of the pit wall, increase the construction excavation speed, and uniformly affect the soil nail and improve the environmental impact. Through the comparative analysis of the stress deformation mechanism of composite soil nails, the mechanism of increasing the self-standing air height of cement soil piles, the frictional force transmission mechanism of pile soil, the integration mechanism of the side shift curve of the support system and the forward movement mechanism of the advantageous slip surface of the edge wall of the foundation pit were studied, which has certain theoretical guiding significance for improving the lateral shift control measures and accelerating the construction progress of such support systems.

Through the quasi-static equilibrium analysis of infinite slope, the influence of moving hole pressure on the seismic stability state of infinite slope of saturated clay soil was discussed. The analysis shows that the attenuation of shear strength caused by the accumulation of pore water pressure during earthquakes will lead to permanent deformation of the slope, and even lead to overall sliding failure, and some clayey soils can also cause slip failure due to liquefaction. A cohesion limit value is introduced to distinguish the final failure mode of such slopes, and the two boundary moving hole pressure ratios are introduced to evaluate the influence of shear strength attenuation on its failure mechanism. Finally, the discriminant diagram of the steady state of such slopes is given, and the analysis steps are suggested.

In building structure, system reliability is an important indicator to measure the overall performance of the structure. In the calculation of system reliability, an urgent problem to be solved is the problem of correlation between structural components or sections. Based on the static elastoplastic method, the failure correlation of reinforced concrete multi-layer frame structure under small and large earthquake conditions was studied, and the partial failure correlation law of frame beams and columns under small and large earthquakes was obtained.

The reaction mechanism of the mega-subtype control structure system MSCSS (Mega-sub eontrolled structural system) under the action of vertical earthquake was analyzed, and MSCSS with additional columns was proposed. MSCSS with additional columns can not only solve the problem of large span of giant beams in structure, but also have good control effect under vertical earthquakes. Based on the stochastic vibration complex mode theory, the influence of the number of layers and the stiffness of the giant beam of the substructure with additional columns is further discussed by using the non-stationary ground motion model, and the results show that the influence of the number of layers of the substructure and the stiffness of the giant beam on the displacement and acceleration response of the MSCSS giant beam with additional columns is very significant.

In view of the current shortcomings of intelligent grading of communities in China, under the premise of clarifying the principle of establishing a comprehensive evaluation index system for community intelligence, the Delphi method is used to establish a comprehensive evaluation index system for residential community intelligence, and a modular and quantitative exploration is carried out on the intelligent comprehensive evaluation of communities. The weight of the index was determined, and the evaluation model was established, which provided an objective basis for the intelligent construction and evaluation of the community in the future.

In the 21st century, China’s urban housing construction has entered a new stage, and the improvement of public life has made housing a new consumption hotspot. With the development of society and the improvement of people’s living standards, people’s requirements for housing are no longer limited to the construction area and layout, but the pursuit of fine, flexible and comfortable living space. It is proposed that architects should adopt new concepts and new technologies in the design of urban housing to meet the needs of residents’ various living modes and lifestyles, provide residents with comfortable, convenient, safe and reliable, green ecology, and diverse characteristics, and pay attention to the rationality of function, the economy of area, the adaptability of apartment type and the technology of housing.

In order to explore the deformation law of reinforced concrete beams reinforced with carbon fiber cloth under the second-phase load, the nonlinear finite element program of the reinforced concrete beam reinforced concrete beams reinforced by carbon fiber cloth reinforced concrete beams under the second-phase load is prepared by Visual Basic, and the calculation results show that the results are in good agreement with the experimental results, and the stress process of the reinforced beam can be better simulated and analyzed by this program.

Zr70Al3Ni63Cu10Nb10 bulk amorphous alloy with a length of 14 mm and a diameter of 3 mm was prepared by arc melting and suction casting. The thermal stability analysis shows that the alloy has a large subcooled liquid phase region. The room temperature compression experiment showed that the alloy had high yield strength, and there was obvious aliasing phenomenon and an obvious strain softening stage on the stress-strain curve after the alloy yielded. Combined with the morphological characteristics of fracture, the shear fracture mechanism of amorphous alloy was analyzed and discussed.

The experimental conditions of microwave plasma chemical vapor deposition (MPCVD) were studied by orthogonal design test method. The results show that when the microwave power is 1 500W, the reaction gas pressure is 8.5kPa, and the flow ratio of methane, nitrogen and hydrogen is 8:20:80, the prepared carbon and nitrogen nanotube film field emission characteristics are the best, and the current density is 3.2 mA/cm8 when the electric field strength is 0.3 V/μm and the electric field strength is 5.2V/μm.

The permeable agent, process parameters, microstructure and properties after co-osmosis and its application in mold were studied. Solid boron nitriding agent is composed of boron supplier, nitrogen supply, activator and filler, which is simple in process and easy to implement, and is a chemical heat treatment method that can obtain good permeable layer performance. Through solid boron nitriding to obtain a reliable and stable boron nitriding layer on the mold surface, the permeable layer is composed of boride layer (Fe2B, FeB) and transition layer, and a boride layer with high hardness can be obtained after infiltration, and the permeable layer has high wear resistance, good heat resistance and corrosion resistance. The application of boron nitriding technology in the manufacture of molds can greatly improve the service life of molds.

By measuring the power of counterflow and cross-flow rotary packed beds under different gas and liquid flow and speed conditions, the relationship between rotating bed power and process parameters was analyzed. The experimental results show that the gas flow rate has almost no effect on the packed bed power within the normal working range. The power from dry bed to wet bed produces a sudden jump from dry bed to wet bed, and then increases steadily and straight with the increase of flow; The dry bed power increases slowly with the speed, while the wet bed power increases faster with the speed n. The wet bed energy consumption per unit mass of liquid decreases with the increase of flow rate. The ratio of net power to wet bed power increases with the increase of speed and flow. Increasing the liquid flow rate and appropriately increasing the speed can improve the effective utilization of the rotating bed power.

The description of part information is the first problem to be solved in computer-aided geometric tolerance design. Based on the theoretical basis of digital description of GPS constant class and feature, combined with the correlation analysis of part structure and functional features, the part feature information model and corresponding geometric tolerance project generation rules for CAx integration are established. This lays the foundation for the integrated control of geometric tolerance information in CAD/CAM.

In order to meet the needs of special powder preparation, DG-35 double grinding disc special mill was developed by adopting the principle of shear crushing. The key parameters - the role of the gap △H between the dynamic and static disks and the relationship affecting the quantity and particle size of grinding were analyzed, and the relevant design parameters were reasonably selected. The equipment has a unique two sets of dynamic and static disk structure, with an effective gap adjustment system, its compact structure, high production efficiency, easy maintenance, widely used in special grinding powder, especially heat-sensitive powder processing, non-ferrous (pollution) material powder and viscous object grinding and other industries.

Based on the virtual prototyping technology, the parametric dynamic analysis model of an engine was established by ADAMS software. Several key parameters affecting engine performance were parametrically analyzed, such as the swash plate distribution circle radius, swash plate inclination angle and guide trough form. The results show that with the increase of the inclination angle of the swash plate, the output speed of the mechanism also increases. The structure in the form of a straight guide trough runs more smoothly than the structure in the form of a figure-eight guide trough.

For the wave equation system with one-dimensional viscous resistance and restoring force in the feedback boundary control problem, it is transformed into an abstract Cauchy problem in the function space, and the system operator is pre-compacted and is the generator of a certain C0 compression semigroup, and the spectral distribution characteristics of the system operator are obtained, including that the supremum of the real part of the spectral point is less than zero and the spectral point is located in a finite band domain parallel to the imaginary axis, which lays a foundation for further discussion of the stability, controllability and Riesz basis properties of the system.

In order to meet the needs of actual forecasting, the multidimensional combination prediction problem is proposed, that is, the variable weight combination prediction of several single multidimensional predictions. Under the premise that each single prediction is unbiased and obeys the normal distribution, the prior distribution density and posterior distribution density of the p moment prediction vector Xp are found. Using subjective prior information, prediction information and sample information, and Bayesian estimation method, Bayesian maximum likelihood estimation of Xp is obtained, and its weight changes with the change of p. This method makes full use of the relevant information between multidimensional variables, further improves the scientificity and effectiveness of prediction, and reflects the further comprehensive application of sample information and prediction information.

The structure and statistical law of the wavelet coefficient of the image are discussed, and it is pointed out that the wavelet coefficient at each layer of the quadtree has self-similarity, and a hybrid Gaussian model is established to describe the wavelet coefficient by using this self-similarity. In addition, the four-tree layer has correlation between the nodes between the layers, and an implicit Markov tree model (HMT) is established by using the self-similarity information and correlation between the wavelet domain coefficients to remove Gaussian white noise in the image signal, and the Lenna image is used for experimental simulation. Compared with the traditional low-pass filtering method, this method can better preserve the details and edge information of the image while filtering out the noise. The results show that the implicit Markov tree(HMT) model reflects the characteristics of the image more accurately and has a better denoising effect.

Due to its hidden row and global search characteristics, the genetic algorithm has advantages that other conventional optimization algorithms cannot have. However, the standard genetic algorithm has shortcomings such as slow convergence speed and easy "precocious puberty". In view of the limitations of the standard genetic algorithm, the design of the genetic algorithm is improved from many aspects, such as adaptation value, crossover and variation operators, and selection of control parameters. This improved genetic algorithm can further improve the search ability, search efficiency and convergence performance of the algorithm. Finally, the optimization model of (N+M) customer-error system is taken as the optimization goal, and the optimal solution of the cost model is obtained. The calculation results verify the validity and correctness of the algorithm.

The research of the comprehensive evaluation system of distribution network is an important part of improving the modern and scientific level of distribution network construction and transformation management and deepening the power grid transformation. Taking the minimum comprehensive cost of the network as the objective function, the improved ant colony algorithm is applied to find a set of better solutions from many feasible solutions as the evaluation object, and the economy, load rate, network loss, network reliability, short-circuit current level, etc. are taken as the evaluation indicators, and a comprehensive evaluation system based on fuzzy pattern recognition theory is established.

The mechanism of water resource conversion in Shiyang River Basin was qualitatively analyzed, and the water resource conversion model of Shiyang River Basin was established by combining the calculation units. Using the model, the change process of groundwater level in each irrigation area from 2000 to 2020 was predicted, and it was found that if the current way of water resources development and utilization continued, it would be difficult to maintain the Shiyang River Basin, and the serious shortage of water resources became a key factor leading to the current ecological and environmental crisis in the Shiyang River Basin.