Excess enthalpy is an important basic data of modern scientific research and engineering design, and it is difficult to predict accurately. The authors have pointed out that the properties of the solution depend on the organic connections and mutual constraints of all the molecules that make up the solution, and this synergy is not a simple superposition of individual interactions between the same molecules or heterogeneous molecules, but shows a complex synergistic behavior of the whole. Compared with pure liquid, the composition and properties of solution are special because molecular interaction forms special aggregates and in the special synergy of intermolecular forces. According to this, the three-factor model of excess enthalpy is constituted. On this basis, the key parameters of the model were quantitatively characterized by Wiener index, and a two-parameter model of excess enthalpy of a series of solutions composed of pentanone-2 and C3~C8 fatty alcohols was established, which was tested with experimental data. The results show that the calculated value of the new model is close to the calculated value of the three-parameter model proposed by the author, and slightly better than the calculated value of the three-parameter model proposed by Liu Guojie.

Batch vacuum rectification was used to separate and purify the heat-sensitive, high boiling point and high freezing point organic matter trans-1,2-cyclohexanediol, and the optimal operating process conditions were optimized by using the method of variable pressure strength and variable reflux ratio. The operating conditions are: hot water with a temperature of about 96 °C is used as the condensing medium at the top of the tower; Full reflux start time: 2 h; Control kettle temperature 180~185°C, segmented constant vacuum 0.086~0.092 MPa; The segmented constant reflux ratio is 5→8→12. The yield of the product obtained under this operating condition is more than 87%, the purity of the product can reach more than 98%, and the color is white.

Applying the sensitivity analysis method of chemical system, the influence of velocity constant ratio K and operation deviation from the optimal point on product yield was studied for the first-order series reaction Ak1→Rk2→S described by the equal-volume tandem kettle model. The results show that the higher the recovery efficiency of the system, the less influence of K value change and operation deviation from the optimal point on the product yield. For the industrial serial reaction process with high recovery efficiency, the first-order sensitivity coefficient and second-order sensitivity coefficient decrease with the increase of the N value of the number of tandem segments, so the system operation sensitivity is the lowest when PFR is selected. The larger the first- and second-order sensitivity coefficients, the more accurate it is to track the optimal point operation in time with the change of system parameters, which is an effective way to ensure the improvement of yield.

The particle motion in the cyclone was studied by numerical simulation: the Reynauds stress model of turbulent anisotropy was used for the single-phase flow field, and the random orbital model with phase-coupled phase coupling was adopted for the gas-solid two-phase flow field. By describing the motion trajectory of particles, the physical mechanism of particle movement in the cyclone separator is revealed. The results show that the motion trajectories of particles are complex and have great randomness. In particular, small particle size particles are significantly affected by air turbulence, even if the particle size and incidence position are the same, their motion trajectories are different, and the final position is also different; Particles with small particle sizes are more susceptible to secondary eddy currents, which reduces the efficiency of the separator; In addition, several phenomena affecting the separation efficiency, such as upper ash ring, exhaust pipe short-circuit flow and dust outlet remixing, are also simulated, which lays a foundation for further research on the separation mechanism theory and experimental research of cyclone separator.

Using polyethersulfone hollow fiber membrane as the support film, a composite charged mosaic film that can effectively transfer electrolyte and retain low molecular weight organic matter was prepared by interfacial polymerization. The uniform design was used for the process of preparing charged mosaic membranes by interfacial polymerization, and the regression equation was obtained by using SPSS software for data processing, which described the influence of various factors on the separation performance of the membrane. In the experimental range, the acid acceptant concentration had little effect on the membrane separation factor; 4-(chloromethyl)benzoyl fluoride concentration and surfactant concentration can be maximumed; There was an interaction between polyethyleneimine concentration and interfacial polymerization reaction time. The calculated values of the model are in good agreement with the experimental results, indicating that the model can be used to guide the practice of film formation. Under the optimized conditions, the interception rate of membrane to inorganic salts does not exceed 30%, the interception rate of membrane to sucrose is greater than 90%, and the interception rate of p-xylenol orange can reach 96%, indicating that the membrane can be used for the separation of inorganic salts and low molecular weight organic matter.

Small-leaved lilac (Syringa pubescens Turcz.) It is a plant of the genus Synnga of the family Oleaceae, in which the main medicinal active ingredient is olive bitter glycoside belonging to the splitting cyclic ether terpene glycosides. The leaves, stems and buds of small-leaf cloves were selected as explants, callus induction and culture were carried out on MS and LS media, and the cell growth cycle of suspension culture was determined after three successions, and the suspension cell culture system of small-leaf clove was established for the first time. The content of oleuropein in suspension cell culture and culture medium was determined by RP-HPLC method, and its structure was determined by 3HNMR and 1CNMR.

The molecular structure of monomeric hydrocarbons in straight-run gasoline is digitally encoded, and the nonlinear correlation model between the gas chromatographic retention index and its molecular structure of monomeric hydrocarbons in straight-run gasoline is constructed by error backpropagation neural network algorithm, the neural network structure is 3 layers, the hidden layer nodes are 7, there are 15 inputs, corresponding to the 15-bit digital code of the monomer hydrocarbons, and 1 output, corresponding to the gas chromatographic retention index. The prediction results show that the correlation coefficient and standard deviation obtained by the error back-transmission algorithm are better than those obtained by the multiple linear regression method.

2-Amino-3-(trifluoromethyl)benzoic acid is an important drug synthesis intermediate, and its synthesis method has been studied. 2-trifluoromethylaniline, chloral hydrate and hydroxylamine hydrochloride were used as raw materials to synthesize 2-amino derivatives, and then converted into o-dicarbonyl derivatives in concentrated sulfuric acid, and finally 2-amino-3-trifluoromethylbenzoic acid was obtained by oxidation with hydrogen peroxide in sodium hydroxide aqueous solution. The total yield of 2-amino-2-(trifluoromethyl)benzoic acid was 3.53% based on 6-(trifluoromethyl)aniline. The synthesis method is easy to operate and has high yield, and all the synthesis steps of the method are water-phase reaction, which is easy to industrialize.

In order to further investigate the inhibitory effect of biquaternary ammonium salts (MBQA) on saprophytes (TGB), the inhibition mechanism and model of biquaternary ammonium salts MBQA on saprophytes in culture media were studied by atomic force microscopy, electron probe and scanning electron microscope. The results show that MBQA can preferentially adsorb on the surface of carbon steel metal in the culture medium to form a complete and dense organic adsorption film, which makes it difficult for the products produced by bacterial metabolism to reach the surface of the metal matrix. At the same time, MBQA makes the deposition of biofilms loose, and the corrosion of submembrane sulfate-reducing bacteria is also effectively inhibited.

Most urban car wash water is directly discharged into the city’s sewage pipe network without any treatment, which aggravates the tension of urban water supply and environmental pollution. After analyzing and determining that many indicators of urban car wash water exceeded the standard, single-factor and amplification experimental studies were carried out, and the process lines and data for treating flushing water were obtained. The main indicators of the treated water are: the content of the detergent drops to 0.008 mg· L-1, suspended solids 0.2 mg· L-1, BOD5 and CODCr are also far below the national household miscellaneous water index and can be reused.

The effects of pH, temperature, voltage, NaCl dosage and other factors on phenol removal rate and COD removal rate were investigated by electrocatalytic oxidation. The results show that this method can effectively remove phenol and COD from wastewater, especially the two factors of voltage and Na-Cl dosage have a great influence on the removal rate of phenol and COD. Two composite electrocatalytic oxidation methods were used to treat phenol-containing wastewater, one was direct addition of H2O2, and the results showed that the phenol removal rate could reach more than 95%. The other is concentrated H2SO4, and the phenol removal rate can reach more than 90% under suitable conditions. It is concluded that the electrocatalytic oxidation method can achieve satisfactory results in the treatment of wastewater containing refractory organic matter.

The design method of high concrete mix ratio of steel fiber was discussed. According to the characteristics and requirements of steel fiber high-strength concrete, three kinds of steel fibers (milled steel fiber MF, cut bow steel fiber BF, shear corrugated steel fiber SF) high-strength concrete were prepared, and the compressive test and elastic modulus test of cube and prism specimens were carried out, and the effects of cement slurry content ρp and steel fiber volume ratio ρf on the workability of mix and the basic mechanical properties of high-strength concrete were analyzed. The results show that the content of cement slurry and the volume rate of steel fiber are important factors affecting the workability and mechanical properties of high-strength concrete mixture, and the results obtained can provide useful references for further research.

In the joint support structure of pile anchor and soil nail, the distribution of earth pressure between pile anchor and soil nail is the key to the design of joint support structure. The strengthening of soil nails will significantly reduce the soil pressure directly acting on the pile anchor structure, thereby reducing the stress level of the bolt in the pile anchor structure and shortening the depth of pile insertion into the soil. Under normal circumstances, the side wall of the foundation pit of the joint support structure of pile anchor and soil nail is very small, and there is generally no significant rupture surface within the length of soil nail, and the soil nail support part can be regarded as an intermediate unit in the process of earth pressure transmission to the pile anchor structure. Based on this, the distribution of earth pressure between the two supporting structures and the coordinated deformation of the joint support structure can be calculated. Through the calculation of the side wall of the foundation pit and the comparison of the monitoring results, the engineering applicability of the earth pressure distribution mode is verified, which has certain reference value for the design and calculation of similar supporting structures.

Assuming that the slip fracture surface is a polyline through the wall heel, the horizontal layer analysis method is generalized to the calculation of earth pressure of the retaining wall filled with layered soil, which reasonably explains the nonlinear characteristics of the active earth pressure distribution when the wall back is not smooth. In the translation mode, the horizontal layer analysis method can obtain the active earth pressure resultant force that is basically the same as Coulomb’s theory, but the overturning moment obtained is greater than the result obtained according to Coulomb theory, and the resultant force point is significantly higher than the result of Coulomb theory, which indicates that Coulomb theory overestimates the overturning stability of retaining walls in translation mode. In addition, the theoretical analysis shows that the upper and lower hard filling scheme behind the wall is better than the upper hard and soft bottom filling scheme.

Starting from the vibration theory of cantilever beams, the calculation of wind response of high-rise buildings and the principle of measuring wind loads of high-rise buildings by using high-frequency balances in wind tunnels are discussed, and the determination of average wind force, pulsating wind, wind-induced vibration inertial force and equivalent static wind load required for building structure design is further analyzed and discussed, and the limitations and application scope of the proposed method are pointed out, which can provide reference for wind load determination in the structural design of high-rise buildings. The analysis results show that the method of finding the equivalent static wind load along the height distribution of high-rise buildings is suitable for downwind force, and there is a theoretical error due to the influence of vortex shedding force when applied to crosswind wind.

Through the measurement of the shrinkage strain of 180 commercial concrete specimens in 24 groups for 99 consecutive days, the calculation formula of shrinkage strain of commercial concrete under standard conditions was analyzed, and the multi-coefficient shrinkage strain calculation formula of commercial concrete under non-standard conditions was analyzed by multi-coefficient superposition method ε(t)=ε(t)0β1β2β3β4β5. In addition, the calculation formula of shrinkage strain proposed by the experiment is analyzed and compared with the ACI contraction formula, the contraction formula of China Academy of Building Research and the contraction formula of Wang Tiemeng, and the results show that the formula proposed in this paper is more suitable for the calculation of shrinkage strain of commercial concrete.

Metro tunnels in cities generally choose to pass under the road, so it is inevitable to cause damage to the pavement of urban roads. The various types of damage caused by shield construction of pavement were analyzed, the cost composition of pavement life cycle was discussed, and the evaluation methods and standards of highway asphalt pavement performance were adopted to establish a risk assessment model between the maximum settlement of asphalt construction pavement due to shield construction and its performance indicators and cost loss, and the model application research was carried out.

Industrially produced SiC submicron powder was selected to prepare nanoCu by displacement reaction. SiC/Cu coated powder was prepared by direct reduction-rotation precipitation process. Cermet composites are obtained by atmosphere sintering. The original SiC powder, coated composite powder and firing samples were characterized by AES, XRD, SEM and other analytical methods. The results show that the coated composite powder has a "core-shell" structure, and Cu2O appears in the composite powder due to the spontaneous oxidation of Cu. SiC particles in the wrapped structure inhibit the grain growth of Cu during the sintering process, so that the sintered sample presents a nanostructure.

Fe-based amorphous alloy (Fe40Ni40P14B6) with high glass formation capacity 100-xGax (x=0, 2.5 and 4.5) was prepared by single-roller copper wheel rotation. The corrosion behavior of amorphous alloy (Fe40Ni40P14B6) 100-xGax (x=0, 2.5 and 4.5) in HCl solution of 1 mol/L and 3 mol/L was studied by electrochemical method, and the results showed that the amorphous alloy (Fe40Ni40P14B6) 100-xGax (x=0, 2.5 and 4.5) had high corrosion characteristics in HCl solution, and the corrosion resistance of iron-based amorphous alloy increased with the increase of Ga content. In addition, the corrosion resistance of amorphous alloy (Fe40Ni40P14B6) 100-xGax (x=0, 2.5 and 4.5) and stainless steel (1Cr18Ni9Ti) in HCl solution of 1 mol/L and 3 mol/L respectively, the corrosion resistance of amorphous alloy is better.

Fe40Co50.3Nd67Dy9.5B3 strip with a thickness of 0~5 μm and a width of about 20 mm was prepared by single-roll quenching method, and the alloy was analyzed by magnetic force microscopy (MFM) method, and a certain amount of hard magnetic phase R2M14B (M=Fe or Co, R=Nd or Dy) would precipitate on the matrix after annealing of the sample from the obtained magnetic map, and its magnetic domain size range was 200~500nm, the magnetic domain size was much larger than the grain size, and the magnetic domain spanned many grains. That is, the domain structure of exchange action appears.

The research status of laser surface strengthening related problems is introduced and prospected. The main contents include: (1) laser surface strengthening process and its control research. The use of beam transformation to form a specific array or periodic distribution of the beam is a very promising advanced process; (2) Numerical simulation and optimization and evaluation of strengthening process. Semi-analytical and axisymmetric (finite element) models can perform semi-quantitative calculation and analysis of strengthening process parameters and results, while the calculation and prediction of temperature field, multiple phase transitions, microstructure evolution, final phase composition and mechanical properties of the entire strengthening process of actual materials will still be the focus of future numerical simulation. (3) Beam quality and space-time transformation. The beam quality corresponds to the repeatability of the enhanced process. The study of the temporal and spatial distribution of laser beams can fully explore the potential of laser surface strengthening process to meet the specific requirements of material properties for strengthening process to the greatest extent.

Taking an actual management information system as the background, this paper introduces how to complete the demand analysis, design and implementation of family planning services and management information system based on Client/Server mode according to the standardized method of software engineering, and also discusses the key technologies in its system database design and system development, and some of the target systems achieved can greatly improve the efficiency of population and family planning management in the city.

In order to improve the reliability of power supply in the power grid, the automatic input device of backup power supply is widely used in the power system. Most of the devices currently in operation, whether analog or digital, are stand-alone and elemental. This paper analyzes the shortcomings of component devices, and introduces in detail the process of intelligent backup power automatic input device developed by using the data resources collected by scheduling automation SCADA system to integrate the operation information of the whole network, and its backup device automatic input module and transformer economic operation module. The new device can easily realize the automatic input of different forms of backup power such as power supply and transformer, and can also monitor the economic operation of transformers. The use of intelligent backup power automatic input device that integrates the operation information of the whole network not only improves the accuracy of operation, but also plays a certain role in improving the safety and economy of power grid operation.

Combined with the actual needs of the networked manufacturing system in the Cheng, German and Mianshan regions, the requirements for the e-mail system were analyzed. Furthermore, a hierarchical and distributed e-mail system architecture is proposed, and its network structure and software architecture are elaborated and studied. The network structure is divided into Internet layer, load balancing layer and internal network layer; Its software architecture is divided into: presentation layer, business logic layer and message processing layer. And in the Redhat Linux 9 environment, its detailed configuration process is given. It plays a consolidating role in the stable operation of the networked manufacturing system, and has certain reference and guiding significance for the construction of large-scale mail system.

Let X1,X2,...,Xn be a list of non-negative independent random variables with the same distribution, and its distribution is: Fα(x)=(1-α)F1(x)+αF2(x), where α∈[0,1], F1(x),F2(x) are all distribution functions defined on R+, now Y1, Y2,..., Yn are non-negative i.i.d~G(t) truncated random variable columns, and Xi and Yi are also independent of each other, and it can only be observed that Zi=min(Xi,Yi),δi=I( In the case of Xi≤Yi)(i=1,2,...,n), an estimate of the pollution coefficient α is given, and its compatibility is proved when G(t) is known.

Based on the analysis of quality function configuration, a quality function configuration model based on data envelopment analysis method is proposed. The model makes full use of the input and output information of the quality house, weighs and optimizes various contradictions and conflicts in the quality house, and judges and evaluates the technical characteristics in new product development or old product transformation by analyzing the production effectiveness of each decision-making unit, so as to help product developers make effective decisions and make the products they design meet the needs of customers to the greatest extent. Case studies show that the model is feasible and effective.

According to the gyro rotor mechanics equation, a rotordynamic model considering the change of system parameters is established, and a discrete sliding mode observer and integral discrete sliding mode controller are designed, and MATLAB SIMULINK is used for dynamic simulation and compared with linear control. The results show that after sliding mode control, the overshoot in the time domain is reduced by 40% and the adjustment time is shortened by 60%. The frequency domain stiffness is increased by 42% in the low frequency band, 110% at the lowest point in the middle frequency band, and 53% in the high frequency band, which significantly enhances the system’s ability to suppress external disturbances. After the introduction of the boundary layer, the jitter of the control voltage is greatly weakened, the accuracy of system control is improved, and the energy loss is reduced. Therefore, sliding mode control can improve the dynamic performance of the system, and has strong robustness under the influence of parameter changes and external disturbances in the system.