Two azo compounds (1: 1-phenylazo-2-naphthol and 2: 1-(2-nitrophenylazo)-2-naphthol) were synthesized by diazo coupling reaction of aniline and o-nitroaniline with 2-naphthol, respectively. Their structures were characterized by IR, and the spectral properties of the compounds were studied by UV spectra. The results showed that the two compounds have big molar absorptivity (1：ε_478nm = 1.49 × 10⁴ L/mol·cm；2：ε_329nm = 1.32 × 10⁴ L/mol·cm). When the pH of the solution is less than 10, the UV spectrum is basically unchanged. In the strong alkaline range, the UV spectrum changes, showing a certain acid-base discoloration.

Using sodium silicate, anhydrous calcium chloride, aluminum sulfate and sodium Carboxymethyl cellulose as raw materials, polyaluminum calcium silicate cellulose composite (PSiAlCa-CMC) flocculant was prepared under the optimum conditions, and then used to treat the simulated Songhua River water sample. The flocculant was added to the simulated Songhua River water sample to explore the effect of application conditions on flocculation efficiency. The results show that when the dosage is 2.0 mL/L, the flocculation time is 20 min, the stirring speed is 100~140 rpm, the temperature of water sample is 15~20 ℃, pH is 5~6, the PSiAlCa-CMC flocculant has the best flocculation effect. The flocculation effect of cellulose compound flocculant on simulated Songhua River water sample is good, the chromaticity is above 98% and the turbidity is over 92%. The results show that the flocculant successfully flocculates impurities in water and can be applied to sewage treatment in practice.

In view of the problems such as large size, unstable performance, high power consumption, high cost and low efficiency of the control system of seeding robot. A sowing robot based on STM32 microcontroller is designed. The design to STM32F103ZET6 microcontroller as the core, L298N chip to drive the motor, DHT11 chip to detect the temperature and humidity of the soil, infrared sensor and ultrasonic sensor together avoid obstacles on the road for seeding robot, ATK-ESP8266 WIFI module remote control of the robot, and reserve the monolith I/O port, easy to add functions. This design focuses on the analysis of the motor drive module and the software design process of temperature and humidity acquisition. This design scheme solves the problems existing in the seeding robot to a great extent, and make seeding robot more convenient in use.

Second-order objects has extensive representation in the process control systems. In order to solve the problem of the output response of second-order system under different input conditions, a differential mathematical model of the relationship between the input and the output is established by taking the second-order RLC oscillator circuit as an example. By using the continuous difference method, the recursive relation model of digital input and output in time domain is obtained. The real-time simulation experimental program of the second-order system is compiled based on Kingview software. During the running of the simulation program, any parameters of the system can be given or modified at any time through the simulation interface, and the data and curves of the object response process can be output and displayed in real time. The simulating system has important reference value to adjusting the parameters of controller and the operation teaching of workers in the actual production process.

In order to study the harmonic characteristics of the non-fault-phase voltage in a single phase short circuit generator, taking a nuclear power generator as an example, the two-dimensional finite element model and the single phase short circuit external circuit model are established by field circuit coupling method. Through the single phase short circuit simulation, the harmonic characteristics of excitation current and the non-fault-phase stator voltage after fault are obtained.

Mg₂Si particles are characterized by high melting point, high hardness, low density and small coefficient of thermal expansion, etc. Due to their good bonding performance with aluminum matrix as the reinforcement, Al-Mg₂Si alloy material possesses good mechanical properties. Al-Mg₂Si hypereutectic alloy material has excellent wear resistance while possessing low density characteristics, and it has become an optional material for piston and cylinder head production of automobile and motorcycle engines. In this paper, the development status of Al-Mg₂Si alloy material is introduced, and the preparation technology, metamorphism mechanism and the metamorphism of alloying elements of Al-Mg₂Si hypereutectic alloy material are mainly reviewed.

In order to improve the thermal conductivity, aging and other mechanical properties of carbon fiber composite materials, this article discusses the preparation process of using epoxy resin as the matrix and carbon fiber with excellent mechanical properties as the thermal conductive carrier to prepare thermally conductive composite materials with good performance. At the same time, the heat conduction mechanism of carbon fiber reinforced epoxy resin matrix and the scientific research status of epoxy resin based thermal conductive composite materials in recent years are studied.

Ag₃PO₄/Fe₃O₄/GO composite photocatalysts were prepared via co precipitation and ion exchange method using graphene oxide (GO) as a carrier, which were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetry (TGA), vibrating sample magnetometer(VSM) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS)．The results of photocatalytic decolorization indicated that the Ag₃PO₄/Fe₃O₄/GO mposite photocatalysts showed better photocatalytic decolorization of Rhodamine B (97.6%) than that of pure Ag₃PO₄ (73.4%) . The introduction of sodium persulfate into the Ag₃PO₄/Fe₃O₄/GO tocatalytic system could enhance the photocatalytic performance. In addition, Ag₃PO₄/Fe₃O₄/GO posite catalyst exhibited good activity stability, thermal stability and structural stability.

Analyze the trajectory of the tool, establish the general motion equation of the trajectory, establish the coordinate equation of the tangent point of the trajectory, introduce the FANUC 0i mate system macro program format, customize the macro program, and verify the simulation software.

Impeller is the core part of the engine. Because of its complex shape and structure, it is a typical difficult to machine part. Generally, five axis machining is used. In this paper, CATIA software is used for 3D modeling of a certain type of impeller, the tool path is optimized, the post-processing program is generated, and then VERICUT is used to simulate machining. Finally, it is proved that the method of combining CATIA with VERICUT to process complex parts is feasible.

In order to improve the utilization rate of Castanea henryi, this paper developed a Lactobacillus flavor fermented beverage of Castanea henryi , and analyzed the stability of the beverage components. After baking Castanea henryi at high temperature, shelling and undressing by hand, after , the hydrolysate of Castanea henryi can be obtained after liquefaction and saccharification treatment. Then added white granulated sugar, milk and stabilizer into the hydrolysate, it can be blended into Castanea henryi mixed pulp, and inoculated with lactic acid bacteria mixed fermentation strains after sterilization to prepare the fermented beverage of Castanea henryi. The results shows that: when the fermentation temperature was 50 ℃, the fermentation time was 3 h, and the substrate ratio was 1:1, the flavor of the fermented beverage by lactic acid bacteria from Castanea henryi was the best; carrageenan or propylene glycol alginate can effectively improve the stability of soluble solids in the beverage; after a long period of observation and analysis, the number of viable lactic acid bacteria in the beverage is generally higher than5×10⁸mL^-1, which proves that the stability of lactic acid bacteria in the beverage is high.

According to the joint structure of the human finger exoskeleton, a silicone multi-cavity human-like flexible joint is proposed, a pneumatic software driver for hand rehabilitation robots is designed, and the manufacturing process of the driver is explained in detail. Abaqus software is used to perform finite element simulation of the software driver, and simulation graphics under different air pressures are given. The simulation results show that the theoretical model of the proposed software driver is basically consistent with the experimental data. Compared with other structures, the overall stability and grasping ability are stronger, which provides support for the future application of human-like flexible manipulators.

A network type pneumatic soft actuator is designed with silica gel material. The soft actuator can realize bending deformation under ventilation condition. The driver mold was designed, and the prototype was made. The static experiment and finite element simulation of the actuator were carried out. The results show that the soft actuator has good flexibility and flexibility, and the maximum bending angle can reach 323 degrees. This research lays a foundation for the further application of the software driver.

According to the etiology and treatment of cervical spondylosis, an intelligent air bag cervical traction device is designed. The tractor adopts the functions of automatic inflation and timed deflation. Users can set the traction time and weight according to their own conditions through the mobile phone client to realize the traction treatment scheme guided by artificial intelligence. After the automatic inflation, the air bag and the air pressure system can be separated quickly through the pneumatic connector. During the traction process, the patient can move freely and use comfortably. Safety protection control program is set in the tractor system to ensure the safety of patients. The traction device is used to prevent and treat various types of cervical spondylosis and compression symptoms caused by cervical spondylosis, and realizes intelligent.

A kind of unidirectional bending joint was developed by using elongated artificial muscle. The relationship between the joint bending angle and the air pressure was analyzed by combining theory with experiment. When the air pressure is 0.4 MPa, the maximum clamping force of dual drive unidirectional bending joint is 21.11 n, and that of single drive unidirectional bending joint is 12.38 n; when the air pressure is 0.25 MPa, the bending angle of dual drive unidirectional bending joint is 235.4 ° and that of single drive unidirectional bending joint can reach 239.1 ° when air pressure is 0.35Mpa.

Aiming at the problems of large turbulence and impact in the current sled vehicles due to design and structure, a dual-degree-of-freedom sled independent suspension system is proposed. The suspension system includes a damping moving pair and a rotating pair. The vertical reaction force and the side reaction force of the road surface acting on the ski board can be transmitted through the cooperation of the ball pin pair and the shock absorber and the torque transmission caused by these reaction forces. To the entire sled body to ensure smooth running of the sled and improve comfort. The ADAMS software is used to simulate and analyze the amplitude and stress distribution of the sled board when the sled mechanism suspension system is running under different road conditions. The results show that the damping suspension system can greatly reduce the sled movement. Vibration generated under complicated road conditions.

In order to solve the problem of writing shadows when the main light source is illuminated, an intelligent study desk with auxiliary light source that can be raised and lowered is designed based on the PIC32 microcontroller control technology. Consists of a control system, a dual-motor screw screw lifting mechanism, an intelligent auxiliary light source and a posture correction system. First, UG software is used for three-dimensional modeling, and the simplified model is imported into ANSYS for finite element analysis to verify the stability and correctness of the overall structure design . Finally, the author made a physical prototype, and the experiment showed that: the lifting and descending curve is stable, the auxiliary light source and the posture correction system function well, the overall mechanism runs stably, meets the design requirements, and lays the foundation for the continuous optimization and improvement of the lifting table. Innovation and marketing value.

In this paper, we consider a bisexual branching process with population-size-dependent migration in independent and identically distributed random environments. The conditional mean growth rate per mating unit is introduced, and its related properties are studied, then the upper and lower bounds of conditional mean of the process are obtained. The limiting behaviors of the number of mating units in each generation normalized by these two bounds are respectively investigated.

A necessary condition and a sufficient condition for a matrix to be embeddable in an invertible matrix over a commutative ring are given. Furthermore, it is proved that a necessary and sufficient condition for a matrix of order n to be embeddable in an invertible matrix of order n+1 over a principal ideal domain is that the elements in the adjoint matrix of this matrix are relatively prime. Partial results obtained in this paper generalize the corresponding results for the ring of integers.

Selection of Anhui Province as the research sample, using the method of typical regional, from the economic status, living conditions and living facilities, resources, environment, health status and educational environment to build the evaluation index system of residents' living standards. Descriptive analysis method and factor analysis method were used for empirical analysis ,and the factors affecting residents’ living standard in Anhui Province were studied and analyzed.