In one-pot，the thiol-functionalized SiO2 micro-spheres were prepared by a sol-gel method, and the SiO2 microspheres were modified on the surface of nickel foam by the tableting method to prepare a SiO2@NF electrochemical sensor test. The electrochemical properties of SiO2@NF were detected and optimized by differential pulse voltammetry. The results show that the prepared SiO2 microspheres are uniform in size and high in sphere formation rate, and can be firmly supported on the surface of nickel foam. Differential pulse voltammetry was used for electrochemical detection of Ag+ under optimal conditions. The linear range of the determination was 1~300 μmol/L, and the detection limit was 0.87 μmol/L. It was also used in the detection of actual water samples, better results were obtained.

The spectral characteristics of [Ir(ppy)2(py-H)]+(1), [Ir(ppy)2(py-pr)]+(2), [Ir(ppy)2 (py-pz)]+(3) [ppy = phenylpyridine, py = bis(pyrazol-1-yl)methane, pr = pyrrole, pz = pyrazole] complexes were studied theoretically. The density functional and the single excitation configuration interaction method are used to optimize the ground state and excited state structure, and the time-dependent density functional theory combined with the polarized continuum model is used to calculate the absorption and emission spectra of complexes 1-3 in the CH2Cl2 solution. The bond lengths of Ir-N1, Ir-N4 and Ir-N6 in the ground state are in good agreement with the corresponding experimental values, and the geometric configuration of the excited state changes little relative to the ground state, which is consistent with the stokes frequency shift phenomenon. The lowest energy absorption of complexes 1-3 at 399.07 nm, 401.68 nm and 396.15 nm, and the phosphorescence emission at 513.00 nm, 513.78 nm and 510.38 nm, respectively. The highest occupied molecular orbital (HOMO) of these complexes is mainly occupied by Ir and ppy ligand, while the lowest unoccupied molecular orbital (LUMO) of 1 and 2 is occupied by the π*-type orbital of the ppy ligand, this transition is referred to as the metal to ligand and intraligand charge transfer transition(MLCT/ILCT). However, the LUMO of molecule 3 is occupied by the π* orbitals of the ppy and py ligands, its transition property is only the transition from metal to py-pz ligand (MLCT). The research results show that the introduction of substituent groups on the non-conjugated ligand py will not have an important effect on the color of these complexes.

The direct extraction and preparation method of extracting ginseng extract which is rich in Rg3 and Rg5 from ginseng root powder was studied in the paper, and the technical process optimization was carried out by single factor experiment and orthogonal experiment. In the study, ginseng root powder was used as raw material, natural grape juice was used as acid catalyst, self-made improved Soxhlet extractor was used as an extraction device. According to the experimental results, when the concentration of ethanol was 20%, the temperature of extraction tube was 60 ℃, the temperature of oil bath was 145 ℃, the dosage of grape juice was 10 mL, and the extraction time was 5 h, the total yield of ginsenoside Rg3 and Rg5 was 2.29%. Ginsenoside’s extraction and structure modification were compressed into one step, and solid-liquid separation could be done directly with less solvent due to the method, so that highly activity ginsenosides could be quickly and environmentally friendly prepared.

The management of chemical reagents is an important subject in the research of laboratory management in colleges and universities. In the era of rapid information development, it is of great significance to improve the information management level of laboratory chemical reagents. Taking the pharmaceutical experimental center of Jilin Institute of Chemical Technology as an example, this paper analyzes the existing problems in the management of chemical reagents in the experimental center. On this basis, we explore the construction scheme of information management system to realize the information and standardization management of chemical reagents.

The contents of lead (Pb), cadmium (Cd), arsenic (As) and Mercury (Hg) in Aralia elata (Miq.) Seem were determined by microwave digestion method and atomic absorption spectrometry. The samples were prepared by microwave digestion method. Then the contents of Pb and Cd in Aralia elata (Miq.) Seem were determined by graphite furnace atomic absorption spectrometry. The contents of As in Aralia elata (Miq.) Seem were determined by Hydride atomic absorption method and the contents of Hg in Aralia elata (Miq.) Seem were determined by Cold vapor atomic absorption method. The linear relationship of the methods was good, the correlation coefficient r > 0.995| The detection limit of Pb, Cd, As and Hg were 0.041 μg/L, 0.0048 μg/L, 0.033 μg/L and 0.021 μg/L, respectively| The precision test results were 1.9%, 2.2%, 2.8% and 3.2%, respectively| The average recoveries were 98.5%, 99.0%, 99.4% and 96.4%, respectively. The contents of four heavy metals in Aralia elata (Miq.) Seem from different habitats were different, the Pb content of Aralia elata (Miq.) Seem from Yichun City, Heilongjiang Province was higher than that of others, the Hg content of Aralia elata (Miq.) Seem from Shenyang city, Liaoning Province was higher than that of others. The method proved to be suitable for determination of heavy metals in Aralia elata (Miq.) Seem. It provided reference for the heavy metal limit quality standard of Aralia elata (Miq.) Seem.

A tetra-substituted pyrimidine containing perfluoropropyl group (DMA-PM) was synthesized using the "one-pot multi-component" method, and two crystal materials (A and B) were cultured by solution volatilization. As a kind of mini fluorophore, the crystal material has obvious blue CIE (0.19, 0.12) and yellow CIE (0.49, 0.51) fluorescence, and their maximum emission wavelengths are 435 nm and 563 nm, respectively. Crystallographic studies have shown that this interesting emission phenomenon is rationalized to originate from the weak-interactions-dependent emission and conformation planarity in their crystal structures.

Ba2SrCe2TbO9 ceramic (abbreviated B2SC2T) was prepared using solid-state reaction method. The crystal structure and defect chemistry of B2SC2T were investigated using X-ray diffraction (XRD), electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS). XRD results indicate that B2SC2T ceramic has a triclinic perovskite structure. EPR and XPS show that Ce ions exist as Ce4+, and Tb ions coexist in the mixed valence states of Tb3+ and Tb4+.

C3N4 is kind of typical non-metal semiconductor material, which can realize electron-hole separation under light excitation. So C3N4 shows extremely high value in the field of photocatalysts. At the same time, C3N4 can be prepared through the process of pyrolysis, using the materials rich in C and N as precursors, such as urea and melamine. So C3N4 also owns the advantage of cheap and economical. As a matter of fact, the morphology of C3N4 is very important for their photocatalytic performance. Therefore, it is of great significance to explore the relationship between the acid concentration used in the process of making C3N4 and the morphology of C3N4. Furthermore, after optimizing the reaction conditions, the Fe3+ was further grafted on the surface of C3N4 to further expand the light absorption capacity of the C3N4 sheet.

A large number of tetracycline antibiotics were detected in the environment which posed a serious threat to ecosystems and human health. Carbon-based catalyst-activated peroxymonosulfate (PMS) technology has received extensive attention due to its environmental friendliness and no secondary pollution, but its catalytic oxidation efficiency needs to be further improved. In this paper, peroxymonosulfate (PMS) were activated by carbon nanotubes (CNTs) calcined at different temperatures for degradation of tetracycline (TC) in water, and the effects of PMS concentration, CNT dosage and initial pH on the degradation of tetracycline were investigated in detail. The results showed that the CNTs calcined at 950 ℃ exhibits the best performance on the PMS activation. When the initial pH was 9, the dosage of CNTs was 0.4 g/L, and the molar concentration ratio of PMS to TC was 20:1, the TC degradation is the highest.

A four-degree-of-freedom desktop manipulator is designed. The three-dimensional model of the structure of the manipulator is established by using UG software. The interference of the key components of the manipulator is analyzed through motion simulation, and the interference part is optimized. Then the load of each component of the manipulator is analyzed by dynamic simulation, and the finite element analysis of each component of the manipulator is carried out in combination with the results of motion simulation, According to the results of post-processing, the key components of the manipulator are optimized.

In order to study the influence of switching tube drive circuit, power transformer, output filter inductor and other parameters on the working state and technical indicators of half-bridge converter, an open-loop circuit model of half-bridge converter is established based on power simulation software Saber. The calculation method of key parameters such as power transformer and output filter inductor is given in half-bridge converter. The steady state of the half-bridge converter is analyzed by piecewise linear analysis, small ripple approximation analysis and volt-second equilibrium condition, and the output and input functions of the output filter inductor under continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are derived. The critical values of output inductance, load resistance and duty cycle of CCM half-bridge converter are analyzed. The open-loop model of the half-bridge converter is simulated, and the simulation results verify the correctness of the theoretical derivation. Based on this, the parameter design method to improve the steady-state performance and working efficiency of the half-bridge converter is given, which provides a theoretical basis for the design of the half-bridge converter.

The point cloud captured by millimeter wave radar, TOF camera, and other scanning equipment contains a large number of redundant information and noise points, which reduces the accuracy and processing efficiency of the point cloud registration step. In view of this phenomenon, a 3D point cloud simplification method based on KFCM is proposed. The algorithm maps the original scanned point cloud to feature space by the kernel function. At the same time, the clustering center and membership matrix were updated, and the objective function was established by using the sum of weighted error squares as the convergence mark of the algorithm. Finally, the clustering center was output as the simplified result. Experimental results show that the proposed method can reduce the resolution of source point cloud to achieve simplification effect while maintaining the basic characteristics of point cloud well, and the density of output point cloud can be controlled by adjusting parameters, which can meet the requirements of ICP and other registration algorithms in the adaptability experiment of registration task.

In this paper, the heating system is used as a research object, and the prediction accuracy is not high due to temperature factors, random factors, and factors of the building itself in the central heating heat load. Therefore, this paper proposes to use the BP neural network algorithm for prediction, which has a good control effect on models with nonlinearity and can learn itself. However, due to the large fluctuation of BP neural network, local optimization phenomenon is relatively easy to occur.Therefore, on the basis of using BP neural network, the BP neural network and genetic optimization algorithm are improved and combined to make up for the deficiency of BP neural network. Finally, simulation experiments show that the error of heat loads prediction is greatly reduced,the prediction accuracy is improved, and reasonable heat supply is realized.

In order to improve the trajectory tracking accuracy of the ball and plate system and enhance the system disturbance-rejection performance, an error backstepping control scheme under the extended state observer was studied. Firstly, an extended state observer to estimate the system's uncertain disturbance was designed. Secondly, an error backstepping controller with low-pass filter performance was designed by combining the observed state variables of the angle and the plate velocity with the error backstepping method. The experiment results show that the proposed controller has good trajectory tracking performance, and the effectiveness of the proposed control strategy was verified.

In the degreasing process of automobile coating, the temperature of the degreasing liquid is an important parameter that affects the degreasing effect. According to the degreasing process and control requirements of an automobile factory, an automatic control system for the degreasing process was designed based on S7-300 PLC. Aiming at the temperature of the pool liquid, a temperature-flow cascade control program was designed, The man-machine interface is designed using WinCC configuration software. Good control results have been achieved in practical production applications.

Machine vision enjoys increasingly wide application in intelligent manufacturing. This paper introduces a method for measurement of geometric parameters of L-shaped plate based on binocular vision model. First, the intrinsic and extrinsic parameters are obtained after calibration of the binocular camera| then, compared with the edge detection algorithm, the image of the L-shaped plate is processed with Sobel algorithm| in the end, based on triangulation theory, the three-dimensional coordinates of the feature points of the workpiece are extracted to work of the geometric parameters of the L-shaped plate. According to the experiment, the algorithm is of small measurement error and is able to meet the actual needs.

Dust pollution is becoming more and more serious, which has seriously endangered people's health and normal travel. People have been working to solve the treatment of dust in various ways, but the treatment effect is still not ideal. In recent years, it has been found that the spray method has a significant effect on dust removal, and this paper selects PLC as the core controller of the spray dust removal system by fully analyzing the spray dust removal mechanism. The Smith-fuzzy PID control method is used to reduce the error effects of time delay, nonlinearity, and time variability in the control object. After research, it is found that the high-pressure spray dust removal system controlled by Smith-Fuzzy PID not only realizes the automatic intelligent control system, but also reduces the waste of manpower and material resources and saves the cost of use.

Aiming at the low efficiency of high-voltage operation in distribution network, the robot mechanism configuration and coordinated control method applied in the operation process are studied. The robot includes power supply system, obstacle crossing mechanism, self rescue sensor system and self-locking wheel climbing mechanism. The fuzzy PID controller is used to realize the coordinated control of live working robot. The fuzzy PID controller takes the error and error change rate as the output, and uses the fuzzy control rules to adjust the PID parameters in real time, Through the self-tuning of control parameters at different operation times to improve the control effect, the mechanism configuration and coordinated control method of live working robot in distribution network are completed. The experimental results show that the output signal is stable to a fixed range within 100ms, and the robot successfully completes high-voltage operations such as insulator string replacement, with small overshoot and fast response speed.

As a new type of high-performance and low-cost metal smelting graphite material, graphite electrode nipple has a range of application prospects. However, there are many problems in the production and processing of graphite electrode nipple, which are difficult to clarify. In order to explore the processing performance of the cone of the graphite electrode nipple, the orthogonal turning experiment of the cone of the graphite electrode nipple is carried out. The experiment selects carbide tools with different tool angles for different turning parameter experiments and analyzes them. The results show that when processing the cone of the graphite electrode nipple, the cutting force shows a fluctuating state, and the cutting force increases with the increase of the tool feed rate   and back engagement  , and decreases with the increase of cutting speed  , tool rake angle   and relief angle  . In addition, since the graphite electrode nipple is a brittle material, the tool does not produce a built-up edge when the   is enlarged. Based on the minimum cutting force and surface roughness target, the best cutting parameters and tool angle obtained in this paper are the =0.5mm,  =160mm/min,  =100mm/min,  =12°,  =16°. The optimal process parameters and related conclusions obtained in this paper can provide theoretical reference for enterprises in production practice.

In this paper, iron-nickel alloy powder was prepared by adding 5 % nickel alloy powder into iron alloy powder. The iron / nickel mixed base spray welding layer was prepared on the surface of low alloy steel by plasma spray welding technology. The phase and microstructure of the Fe / Ni mixed-base spray welding layer were studied by orthogonal experiment using metallographic microscope, phase microscope and scanning electron microscope. To determine whether the bonding between the substrate and the spray welding layer is good and to observe and analyze the metallographic structure of the substrate, fusion line and spray welding layer. The software was used to analyze the metallographic phase diagram of the sample. Through the analysis of the hardness, forming coefficient, weld macro appearance, crack and other data of the sample, the Q345 composite plate with high hardness was optimized.