In order to solve the problem that the steel bar spacing is too small when the amount of steel bars in the concrete structure is large in engineering practice, a method of arranging the longitudinal stressed steel bars and reinforcing them is proposed. According to the results of 31 reinforced bonded anchoring drawing specimens, the stress performance test of 17 reinforced concrete reinforced beams was carried out, and the characteristics of bonded anchoring of reinforced beams and the main factors affecting bonded anchoring were discussed in detail, and compared with general beams. The experimental results show that the bonding and anchoring performance between steel and concrete decreases after the use of reinforcement, but the bond-slip characteristics are similar to those of general beams, and the anchoring strength and bearing capacity of the reinforced beams can be guaranteed by extending the anchoring length appropriately, so that the reinforced beams can be applied in engineering practice. The suggested formula for calculating the anchorage length of the reinforcements is given, and the calculation results are consistent with the test results

Using the basically simplified Navier-Stocks equation system, the flow velocity field and pressure field of hydrodynamic lubrication bearings without inertial force are obtained, and the unsteady Reynolds equation under the influence of migration inertia force is derived from the approximate initial conditions, and on this basis, the unsteady Reynolds equation is solved by using the finite element method to obtain the pressure field of the inner and outer membranes of floating ring bearings. The results show that the inertia force has a significant effect on the pressure distribution of the bearing.

On the basis of the ELECTRE method, the idea of purpose planning and ideal point is integrated, and the distance matrix that can make the overall comparison of the index is added; An index system reflecting the coordinated and sustainable development of society, economy and ecological environment is established, and the index weight is determined by analytic hierarchy (AHP) method, and the qualitative index evaluation value is determined by collective value statistical method, which reduces the arbitrariness of decision-making and makes multi-objective decision-making and comprehensive evaluation more rigorous and orderly. The computer program i sequence is compiled in C language, which realizes the rapid calculation of multi-objective decision evaluation. In the decision-making process, decision-makers and analysts can have repeated dialogues, fully embody the characteristics of human-computer interaction, and can accept subjective and objective inputs, and can make individual and group decisions

The basic principle and research method of organic electrochemical synthesis, a high-efficiency "green synthesis" technology, were expounded. The advantages of organic electrochemical synthesis over conventional organic synthesis are discussed in that it can eliminate the root cause of pollution caused by traditional organic synthesis. Combined with the industrialization examples at home and abroad in recent years, the important role of organic electrosynthesis technology in the implementation of the "green chemical" strategy was discussed, and the latest development direction and application field of organic electrosynthesis were discussed, pointing out that organic electrosynthesis will become a hot spot in the research of various basic chemical disciplines and applied technologies in the 21st century.

According to the current Chinese and American specifications commonly used in steel structure design, and combined with the actual engineering design characteristics, the design method of angle steel connection of steel structure nodes is analyzed, and the computer software for design calculation is compiled. The computer software can automatically complete the calculation of the number of bolts, the selection of angle steel type and the determination of angle length after entering simple parameters. The calculation methods and procedures have been applied in engineering practice, and the calculation results are accurate and reasonable, which has high practical application value.

The effects of raw material ratio, reaction temperature, reaction time and other factors on product yield were studied, and the optimal reaction conditions obtained were: the molar ratio of 2-methyl-1,4-naphthoquinone to sodium bisulfite was 1:1.5. The amount of water is 2.1 times the amount of 4-methyl-1,5-naphthoquinone; The amount of ethanol is 2.1 times the amount of 4-methyl-3,5-naphthoquinone; The reaction temperature is 55 °C; The reaction time was 1 h. Under optimal conditions, the yield of vitamin K3 was stable at more than 72.5% and the purity was stable at more than 94%. And the product was verified by infrared spectroscopy.

Rolling bearing ball push planetary reducer is the latest type in mechanical transmission, and its outstanding feature is that rolling bearings are both supporting and transmission parts. According to the specific structure diagram of the reducer, the transmission principle, transmission ratio calculation formula, calculation criterion of maximum transmission capacity and efficiency calculation problems are analyzed. Deep groove ball bearings or angular contact ball bearings can be used for transmission bearing E, its diameter from light series to heavy series, the range of transmission ratio is i=2~3, if non-standard rolling bearings are used, i≤10.The maximum power transmitted by the planetary reducer depends on the product of the frictional moment of the inner ring of bearing E and the angular velocity of the A axis.

The experiment uses low-cost sodium silicate as raw material, and reacts with a variety of inorganic additives and a small number of organic additives to make a new composite detergent that can replace sodium tripolyphosphate by changing its composition structure. The purpose of the study is to maintain the good characteristics of silicates, while focusing on improving the ability to resist hard water and anti-agglomeration, and maintaining the good water solubility of the product. Through preliminary screening and orthogonal experiments, the dosage of each component was determined and the amplification experiment was carried out. The product CEC≈ 200mg CaO/g sample, solubility > 20×10-2g/mL water, good adsorption performance. Due to the easy availability of raw materials and simple process, it has advantages in terms of performance-price ratio.

Using Monte-Carlo stochastic simulation method, the failure correlation law of the cross-section effect constraint of the frame structure is obtained through the failure correlation analysis under small and medium earthquakes, respectively, and simplifies it to the assumption of reliability analysis. The application of correlation law in the reliability analysis of framework structure system is given through example.

Taking the Y/△-11 wiring traction transformer as an example, the law of negative sequence current and high harmonic generated by electric traction load is analyzed, and the measured data are given, and finally the corresponding treatment measures are proposed, including reasonable allocation of reactive power compensation capacity of the two power supply arms, comprehensive compensation of reactive power and negative sequence using the Steinmetz principle, and installation of filters or static reactive power compensation devices on the low-voltage side of the traction substation.

In practice, the elements of a set have many other properties, so they can be represented by matter elements, transforming general extendable sets into material element extensionable sets. Matter elements have extensions, and each kind of expandability can determine a transformation. Under certain conditions, this transformation can determine the extendable field of the extendable set of matter elements, thus providing a basis for determining the extendable field of the general extendable set. By studying the relationship between the extensibility of matter elements and the extendable fields of the extendable set of matter elements, two ways to determine the extendable fields of matter elements are obtained.

The magnetic drive coupling is a non-contact type power transmission device. On the basis of deriving the magnetic torque formula of the magnetic drive coupling, various factors are analyzed and compared in the main parts of the magnetic coupling, and the optimization design idea is proposed, which solves the problem of the ratio of magnet length to air gap length, the problem of length-diameter ratio, the problem of maximum magnetic moment and shortest magnetic circuit, and the ratio of relative displacement angle and pole opening angle.

A method of spatial displacement in kinematics is proposed to construct a CAD model of the scanned surface of the tool in CNC machining based on the deformable NURBS (D-NURBS) free curve, so that the original geometric curve surface has the characteristics of a physical surface, which allows designers to use many force-based tools to interactively shape and directly design the profile in a natural and predictable way. The resulting surface is easy to meet the motion and dynamics limitations of the special CNC machining machine used, and at the same time obtains a new method of toolpath design for freeform CNC machining, which combines kinematics, computer-aided geometric design and CAD/CAM technology to provide a basis for parallel geometry design and manufacturing.

The envelope analysis, which is very effective in the fault diagnosis of reciprocating machinery and vibration machinery, analyzes the process of depicting the envelope, so that the computer can automatically grasp the feature points of the envelope, on this basis, after de-averaging, smooth unequal distance interpolation and other processing step by step decomposition of the fitting signal, it can well extract the envelope signal of each order, which provides a powerful analysis tool for fault diagnosis. After the analysis of analog signal and engineering signal, it is proved that the proposed method is effective and feasible.

Using organic fatty acids and diethylenetriamine as raw materials, an advanced aliphatamidamidoalkyl imidazoline compound was synthesized, and its corrosion inhibition effect on carbon steel in HCl-H2S brine system was studied by static weight loss method and potentiodynamic scanning polarization curve method. The results show that for carbon steel in HCl-H2S brine medium, the compound is a corrosion inhibitor with excellent performance, and its corrosion inhibitor efficiency increases with the increase of concentration, and is not greatly affected by temperature changes, which is a hybrid corrosion inhibitor mainly based on anodic control. The corrosion inhibitor is superior to foreign products of the same type in performance.

The bonding and anchoring performance between steel bar and concrete can be roughly divided into three types according to the shape of the steel bar: the bonding and anchoring of light round steel bar, deformed steel bar and torsional steel bar, and the bonding anchoring performance and mechanism of their bonding with concrete, as well as the bonding degradation and mechanism of light round actinide bar and deformed steel bar under repeated load and repeated load, and finally summarize the bonding anchoring design.

Spiral arm erosion wear testing machine is a kind of solid particle erosion wear testing machine that is currently widely used. The structure design and improvement of this testing machine are carried out, and the grooved wheel feeding device is adopted to improve the feeding stability, and the pulse width modulation speed regulation, photoelectric speed measurement, PID automatic adjustment system control speed is adopted, so that the accuracy of impact speed and feeding speed is greatly improved. Preliminary tests show that the testing machine has stable data and reliable performance, which is suitable for erosion wear mechanism research and material wear resistance test.

In experimental data processing, the magnitude of the correlation coefficient is often used to express the criterion of linear fit. Through experimental illustration analysis and research, a good correlation coefficient does not necessarily mean a good straight-line fitting result, and a good linear fitting of experimental results does not necessarily mean a large correlation coefficient, indicating that the correlation coefficient should not be used as a criterion for the goodness-of-fit of experimental results. It is only meaningful if it is a regression coefficient, or when there is a variable that cannot be measured on a fixed scale.

For multiple measuring instruments to measure the same test at the same time to obtain simultaneous test data, a single-term classification random-effects model was established: yij=μ+μi+eij(i=1,...,n, j=1,...,m), εij, iid.~N(0, σ2j). μi, iid.~N(0, σ20), and εij and μi are independent, i=1,...,n, j=1,...,m. The multivariate statistical analysis method was used to give the equality test H0:σ21=...=σ2m μ. μ, αi, βj are fixed effects, εij, iid.~N(0, σ2) made a consistency test for the systematic error of the instrument, that is, h’0:β1=...=

Based on the fuzzy probability and risk analysis calculation methods, the ambiguous risk problems are studied from a quantitative perspective, and the concepts and calculation models of fuzzy risk rate and fuzzy risk degree are proposed, which are applied to the practice of flood risk analysis, which is a useful supplement to the ambiguity that is difficult to deal with by existing risk analysis methods.

The prototype-based design method is studied, and considering the complexity of mechanical design, a five-tuple expression model of prototype is proposed, namely prototype mockup, attributes, joiners, transformation rules, and prototype flags. Graphic elements are introduced into the model, so that the expression of the prototype contains a wealth of information; The prototype-based design process is proposed, that is, starting from a simple design goal, through the design requirements decomposer, the information about the constraints of the design target is output to the design prototype inference machine 1, the prototype inference machine 1 selects the appropriate design prototype from the prototype library, and translates it into a prototype drawing, and sends it to the prototype inference machine 2, and the prototype inference machine 2 evaluates the refined prototype cases, makes necessary improvements and modifications, and produces design results. In this way, the design is carried out layer by layer, and the amount of information transmitted is increasing, which solves the problem of intelligent CAD technology

Following the theory of software engineering, through demand analysis, the enterprise resource planning (ERP) system process and its main functional modules suitable for small and medium-sized machinery manufacturing enterprises with small batch and order-to-order production are given, and according to the functions and business work processes of the sales management subsystem, the sales management subsystem and its three subsystems are designed in detail by using data flow diagram (DFD) as a modeling and analysis tool. The practical application proves that the scheme is reasonable and feasible, and can achieve good economic and social benefits.

Taking the preprocessing of images in the grain insect detection system as the research object, the contrast extension enhancement algorithm, neighborhood smoothing algorithm and median filtering algorithm are discussed and analyzed, and it is concluded that contrast extension enhancement can expand the dynamic range of target grayscale, neighborhood smoothing has a good effect on eliminating random noise, while median filtering is effective in removing impulse noise, and specific application examples are given. It can be seen from the experimental results that the selected algorithm can complete the task of system image preprocessing.

The stainless steel container is overpressure strengthened to improve its yield limit and design allowable stress, which can achieve the purpose of reducing the wall thickness of the container and reducing the consumption of stainless steel. According to the tensile curve and linear elastic strengthening material model of austenitic stainless steel material, the stress-strain constitutive relationship of the plastic reinforcement section of austenitic stainless steel is returned, and the calculation formula of overpressure strengthening treatment pressure of room temperature austenitic stainless steel container is derived by using thin film theory. The experimental results are in good agreement with the theoretical calculation values, which provides a practical and feasible design method for stainless steel containers.

The hardware composition and software module functions of the experimental system using the "mechanical design" course of microcomputer development are systematically introduced, and the methods of VC++ to create dynamic link libraries and VB to call dynamic link libraries used in acquisition program design are specifically explained. The system improves the measurement accuracy, simplifies the data processing process, and can print out experimental reports and curves, and the user interface is simple.

For the independent work of monitoring system and anti-theft system have certain limitations, the C++Build integrated development language is used, combined with advanced computer network technology, biometric technology, multimedia technology and communication technology, and makes full use of object-oriented design technology to develop fingerprint recognition security monitoring system, and gives the structure of the system, the design and implementation of the software and the composition and characteristics of the system.

Cement-soil pile composite foundation is a widely used form of foundation treatment in China, and its main construction methods are deep mixing method (deep mixing method including slurry and powder deep mixing method), high-pressure jet grouting method (also known as high-pressure rotary spray method) and ramming filling method. Among them, the deep mixing method and high-pressure rotary spray method are commonly used methods in China, and the relative stiffness and calculation method of high-strength cement-soil pile composite foundation are analyzed through engineering case research, which has certain reference value for similar projects.

Aiming at the complex network diagram represented by the relationship matrix, the characteristics of the elements constituting the minimum support tree are analyzed, and two methods for finding the minimum support tree are proposed: direct generation method and table operation method. The two methods do not need to make complex network diagrams, but directly generate the minimum support tree from the relationship matrix, which can effectively overcome the inconvenience of traditional methods to draw network diagrams. Through case studies, the two methods have unique features in solving the minimum support tree for complex problems.

Combined with the needs and characteristics of college student information management, the composition and functions of college student account information management system are discussed, Visual Basic 6.0 is used as a development tool to establish an Access database, and the key technologies and characteristics involved in the development of the system are studied. The system has perfect functions, simple and practical operation, according to different categories of students to manage, query, print out a variety of management reports, account information display is clear and easy to use.

For 22 sets of actual statistical data of per capita sales and per capita national income of light industrial products of a regional industrial bureau, the mathematical model between per capita sales and per capita national income was found by using the sum of squares of deviation as the optimal criterion, and the per capita sales predicted by the model were in good agreement with the actual per capita sales.