Cadmium sulfide semiconductor has appropriate energy band position and strong visible light absorption. It can be used as a catalyst in photocatalytic reaction. It is further synthesized with ethylenediamine by hydrothermal method with chromium chloride and copper reagent as raw materials. Under light conditions(λ> 420 nm), the hydrogen production performance was 57.38 μmol·g-1h-1 and showed excellent stability through cyclic experiment.The cadmium sulfide catalyst was characterized by XRD, SEM, XPS, UV-vis and BET. The experimental results showed that the structure of cadmium sulfide was hexagonal crystal structure, the morphology was one-dimensional nanostructure with uniform distribution, the band gap was 2.28 eV, and the specific surface area and porosity were large. Therefore, cadmium sulfide can be used in photocatalytic hydrogen production experiment.

At present, large tow carbon fiber wound breathing cylinders are becoming more and more popular. Due to the advantages of light weight and high strength of carbon fiber, the breathing cylinders make of carbon fiber composite materials are lightweight and durable, which support them can completely replace the cylinders make of metal tanks. However, the internal and external environment of the cylinder is often complicated, so higher requirements are put forward for the performance of the large tow carbon fiber wound breathing cylinder. Especially for the mechanical properties, toughness and heat and moisture resistance of the resin matrix which determines the overall performance of the cylinder. Therefore, this work summarizes and analyses the infiltration and curing mechanism of the current commonly used resins for breathing cylinders. Our study would help to provide ideas for the development of domestic resins for breathing cylinders wrapped with large tow carbon fibers.

Objective: A non-destructive testing technology combining powder X-ray diffraction (PXRD) and electron spin resonance (ESR) was established to make the quality control and identify the sources of trace elements of 10 commercially available scorpions. Methods: The characteristic marker peaks of Scorpion were obtained by PXRD spectrum simulation method to identify the content and source of NaCl. Some of the trace elements were analyzed by ESR technique. Results: (1) The NaCl content of 10 randomly purchased commercial scorpions was 4.35~13.33 g/100 g, the alum content was 3.73~11.27 g/100 g, the silicon content was 2.38~4.40 g/100 g. (2) The PXRD peaks in the scorpion originate from sodium chloride (NaCl) crystal and sodium sulfate (Na2SO4) crystal. The inorganic salt Na2SO4 originates from the scorpion itself, while NaCl is added through the concocting process. (3)There is a signal with g = 2.003 and a Mn2+ signal with six-line characteristics in the ESR spectrum. (4) In the ESR test, the dried scorpion after the dissolution experiment appears a weak broad signal of g = 4.3 and a signal of g = 2.17 which belongs to the signal of Fe3+and Cu2+, respectively. This phenomenon indicates that Fe3+ and Cu2+ ions are contained in the scorpion itself. (5) Atom emission test on the dissolution-experiment-acqueous solution confirmed that the Mn2+ in the scorpion originated from salt, rather than the scorpion itself. Conclusion: The combined application of PXRD and ESR technology can establish a non-destructive test technology, which can be used for the quality control of Scorpion and the source of transition metal elements.

CdS nanowires (NWs) were prepared by ethylenediamine solvothermal method, and the effects of ethylenediamine dosage and crystallization conditions on the composition, structure, morphology, specific surface area, photoabsorption performance, electrochemical performance and photocatalytic hydrogen evolution activity of CdS NWs were investigated. The results show that the CdS NWs prepared under the optimized conditions is well dispersed, with an aspect ratio of 550 and a radial diameter of about 50 nm. In the experiment of photocatalytic decomposition of hydrogen evolution from water driven by visible light, the hydrogen production rate of CdS NWs is 316 μmol·g-1·h-1, which is 3.0 times higher than that of cadmium sulfide without ethylenediamine. In the fourth hydrogen production cycle experiment, the hydrogen production rate of CdS NWs is about 81% of the initial value, showing good stability. This study provides a basis for further modification of one-dimensional CdS NWs in photocatalytic decomposition of water for hydrogen production.

In recent years, membrane technology has continuously penetrated into various fields and is more and more widely used. The membrane with single component can no longer meet the needs of various fields, especially in special fields such as aerospace, military and national defense. The performance standard of the applied membrane is higher. By compounding more than two components, the membrane functions are complementary and optimized, It is an inevitable trend to prepare composite membranes with excellent properties. In this work, carboxymethyl cellulose (CMC) was mixed with SiO2 nanoparticles and nano cellulose (CNF) to prepare nanocomposite films with good heat resistance and mechanical strength. The composite membrane can be deeply studied and applied in material separation, biosensor and so on.

Fe40Co40Zr9B10Ge1 and Fe40Co40Zr5Mo4B10Ge1 amorphous alloys were prepared by melt-spinning and annealed at different temperatures. The microstructure and magnetic property of the alloys were tested and analyzed by XRD and VSM. The effect of Mo addition on the crystallization and magnetic property of Fe40Co40Zr9B10Ge1 alloy was studied. The results show that α-Fe(Co) phase precipitates from amorphous matrix at the initial stage for two alloys. However, the crystallization products after high-temperature heat treatment are different. The addition of Mo reduces the content of metal compounds at high-temperature. The addition of Mo reduces the grain size of α-Fe(Co) precipitated during crystallization. The addition of Mo also reduces the coercivity.

Flocculation was a common method of wastewater treatment. Introducing magnetic particles into flocculant could improve the performance of wastewater treatment and the separation efficiency of sediment. The inorganic polymer magnetic polysilicate aluminum zinc-chitosan (Fe3O4-PSAZn-CTS) composite flocculant was prepared with Fe3O4 nanoparticles, sodium silicate, aluminum sulfate, zinc sulfate and chitosan as raw materials. It was applied to the simulated water sample prepared from kaolin. The pH, the dosage of Fe3O4, the molar ratio of aluminum and zinc to silicon, the molar ratio of aluminum to zinc, and the mass ratio of aluminum and zinc to chitosan were optimized by single factor test, and the optimal preparation conditions of Fe3O4-PSAZn-CTS flocculant were determined. Through FTIR, XRD, TGA and SEM analysis of Fe3O4-PSAZn-CTS, it was proved that Fe3O4-PSAZn-CTS was a new magnetic composite polymer with amorphous surface by Fe3O4 and PSAZn-CTS closely bonded. Then, the dosage of flocculant, the pH of simulated water sample, the sedimentation time after flocculation were optimized by single factor experiment, and the optimal flocculation conditions of Fe3O4-PSAZn-CTS were obtained. Finally, the raw water sample of Songhua River in Jilin section was treated under the optimal conditions, and the flocculants were separated and dried. The magnetic floc reuse experiment was conducted by adding 50% dried flocculant and 50% optimal dosage of initial flocculant, and the turbidity removal rate could still reach more than 95%.

Objective:to study the preparation and chemical composition analysis of volatile oils from different parts of flower, stem and leaf of north Elsholtzia ciliata. Methods: volatile oils was prepared by steam distillation, the chemical constituents of the volatile oils of Elsholtzia ciliata by steam distillation were identified by GC-MS, and the antibacterial effects were investigated by disk method. Results: the higher contents of Elsholtzia ciliata flowers, stems and leaves were BETA-dehydrogenated elsholtzone, 1,1'-[ethylenebis (oxy)] dibutane and BETA-dehydrogenated elsholtzone, respectively. The results of bacteriostatic experiment showed that the volatile oils of three parts had different inhibitory effects on Staphylococcus aureus, Bacillus subtilis, Bacillus brevis and Candida albicans. Conclusion: the volatile oils of three parts have different chemical compositions and antibacterial activities. This study provides basis for the development and utilization of the volatile oil of north Elsholtzia ciliata.

In view of the problems such as unstable operation of sodium formate drying system, the decline of the dust removal effect of the dust removal tower and large power consumption of fans, the corresponding solutions such as technical transformation of dust removal tower, change of fan running position and transformation of cyclone collector are adopted. The hidden dangers of original equipment are eliminated, the vibration of equipment is reduced, and the monthly power saving is about 10000 degrees. The material collection rate in the first class cyclone reaches 99.5%.The device reaches the expected transformation target.

Based on ergonomics, this paper studies the optimization of the layout of inpatient department in hospital by taking the gastroenterology department of R hospital in J city as an example. Through field visits and questionnaire surveys, problems in the current layout of inpatient department in the gastroenterology department are found. Based on ergonomics, this paper optimizes the layout, and uses Flexsim simulation to compare the layout before and after optimization, so as to verify the effectiveness of the optimization scheme.

Aim the cam contour design and motion simulation based on ADAMS provide an advanced and intuitive method for cam contour design, which has great advantages over the traditional graphic method and analytical method. Through ADAMS virtual prototype design, the author generates virtual trajectory curve and stretches it into cam contour, and completes the analysis of motion parameters at the same time. According to the results of parameter analysis, the law of push motion is changed to avoid rigid impact in motion. The analysis and design method is helpful to design a reasonable cam profile more accurately.

This device is mainly designed for trucks. The device acts on the bottom of the car and applies emergency braking by pressing down the friction group. The friction group is extruded from discarded ordinary car tires. The friction coefficient of the external friction group is increased by squeezing and folding the waste tire to form a flower-shaped concave and convex structure. Using large friction coefficient retention and ground friction braking force to cooperate with the internal friction of the drum brake to play an auxiliary braking role. The design can improve the truck braking effect, reduce the braking distance, prolong the tire wear cycle, improve safety. In this paper, the control principle of the device is analyzed and the structure is designed. The stress and shape variables of the main stressed parts are simulated and analyzed. The simulation results show that it can basically meet the design requirements.

With the large-scale development of new energy and grid-connected power generation, due to the strong fluctuation characteristics of the output power of renewable energy, coal-fired units need to cooperate with the power grid for power dispatching at any time. With the increase of peak-valley difference of power grid, the peak regulation of thermal power generation units becomes more frequent, and the variation of peak regulation load is larger. Based on the operation data in peak regulation process, the correlation of operation parameters is analyzed, and the correlation of unit data is summarized to improve peak regulation strategy and realize efficient peak regulation. The results show that the unit load is strongly correlated with reheat pressure and regulating pressure, and has a linear positive correlation.

The trajectory tracking control precision of the ball and plate system is not high under the unknown disturbance condition. A backstepping control method is studied based on a command filter. Firstly, the ball and plate system model is established, and a second-order command filter is introduced to filter out the noise disturbance of ball position and velocity state variables. Secondly, the error backstepping controller is designed by gradually selecting the Lyapunov function. Overcome the system's external disturbance and realize the input signal progressive tracking control. Finally, the closed-loop system stability is proved by Lyapunov theory. The simulation results show that the controller can effectively suppress the system disturbance and accurately complete the trajectory tracking task.

Aiming at the problems of low overall efficiency and poor control effect in the traditional PID controller parameter tuning method, an improved artificial bee colony algorithm is proposed, which introduces the mutation operator of the differential evolution algorithm into the search equation of the standard algorithm, and adds the adaptive adjustment parameter. This improvement can improve the convergence speed of the algorithm and enhance the local optimization ability, while balancing the global exploration and local development capabilities of the algorithm. Experiments show that the improved algorithm has obvious effect on parameter tuning optimization of PID controller.

The blower is the key equipment in the production process of biochemical aeration in the sewage plant. Preventing the blower from surging is an important foundation and guarantee for the safe and stable production of the system. Taking the control problem of aeration fan in a sewage treatment plant as the research background, the cause of surge and the anti-surge control method are analyzed. Based on SIEMENS S7-300 PLC, the blower anti-surge automatic control system is designed, and good control effects have been achieved in actual production applications.

In order to improve the visual effect of image under low illumination, a new method for measuring the comfortable chromaticity range of plane image is proposed. A low illuminance plane image enhancement denoising model is established. After solving the model through the joint bilateral filtering algorithm, combined with the entropy image compensation method, the details of the low illuminance plane image after enhancement denoising are compensated, the color space of the processed image is transformed from RGB to HSV, and the significant and non significant parts of the image chroma h are distinguished. After the chroma of the left and right views of the significant part is transformed, The comfortable chromaticity range of low illumination plane image is measured by subjective score plane saliency map. The experimental results show that the low illumination image after enhanced denoising is clearer, the blur is reduced, the comfortable chromaticity range of plane image can be measured, and the measurement error is low.

Based on Taylor's formula with integral remainder term, the error estimates of some approximation schemes, such as linear interpolation, quadratic interpolation and half-point approximation, which are widely used in numerical calculation and theoretical analysis of fractional calculus, are derived by integration by parts and an example is given to verify the performance of the theoretical formula.

In the GM (1,1) prediction model, the development coefficient a and grey action b have a direct impact on the prediction accuracy of the model. Based on the analysis of GM modeling principle and the influence of parameters on model accuracy, an elite ACO algorithm with adaptive pheromone concentration adjustment and GM (1,1) fusion prediction model are proposed. Without changing the expression of GM (1,1) model, the improved ACO algorithm is used to solve the optimal parameters of the model. The experimental results show that compared with the traditional GM (1,1) model, the prediction accuracy of the improved ACO algorithm and GM (1,1) fusion model can also get better prediction effect under the condition of large error of the traditional GM model, and has advantages over the traditional model in applicability. It is a new idea to improve the accuracy of the model. It also shows that it is reasonable and scientific to use the adaptive elite strategy to improve the ant colony algorithm and improve the global optimization ability of the algorithm.

A composite adsorbent (CS-PAC) was prepared using chitosan (CS) and powdered activated carbon (PAC) for the adsorption of dissolved organic matter (DOM) in the secondary effluent of a sewage plant, with UV254 as the DOM The detection parameters of the concentration were used to study the adsorption performance and kinetic characteristics of the composite adsorbent on DOM. The experimental results show that the removal rate of DOM increases with the increase of the adsorbate concentration. With the increase of the dosage of the composite adsorbent and the extension of the contact time, it first increases and then tends to be stable. The adsorption basically reaches equilibrium after 60 min, and the highest removal rate of DOM reached 74.17%. The adsorption kinetics study shows that the adsorption process is more in line with the Freundlich model and is dominated by multi-layer adsorption; the adsorption process of the composite adsorbent to DOM is suitable for the description of second-order kinetics, and the main adsorption is chemical adsorption.