Self-service station is not very popular in our country.A new layout method of the ring fueling island in city fueling station was designed basing on the investigation for the present situation of self-service refueling service.At the same time, it also increases the advanced management mode and service function including network query,reservation queuing,mobile phone online payment and safety locking and alarm for abnormal operation of tanker,and so on.

Polyvinyl butyral (PVB) was synthesized by precipitation method with polyvinyl alcohol (PVA) and n-butyraldehyde, and hydrochloric acid as catalysts. The effects of  m(n-butylaldehyde):m(PVA), catalyst dosage, dosage of emulsifier, reaction time (tL) at low temperature, high temperature reaction temperature (TH) and reaction time (tH) at high temperature on the aldolization was discussed, the results showed that the optimum process conditions were as follows: m(n-butylaldehyde):m(PVA) was 2.2:1, catalyst dosage was 13% (total weight of n-butylaldehyde and PVA）, dosage of emulsifier was 1.9 %（total weight of n-butylaldehyde and PVA）, reaction time was 3 h at 3-7 ℃, reaction time was 1 h at 45 ℃, the acetal degree of polyvinyl butyral is 88.47 %.

Introduces the development course of hydrogen peroxide direct oxidation process, emphatically introduces the Basf/Dow chemical and Evonik/Uhde company process, such as the reactor forms and the different separation unit, and put forward the hydrogen peroxide direct oxidation process development direction in the future.

Physical and chemical properties and application field of propylene oxide (PO) is reviewed. Introduce the current situation of PO production process. At present, the technology of industrial production including chlorohydrination process, co-oxidation process, cumene hydroperoxide process (CHPPO) and hydrogen peroxide direct oxidation process (HPPO). Two new production process routes of propylene oxide by CHPPO method and HPPO in China are analyzed. By summarizing their characteristics in two methods and research progress of these production techniques and suggestions for development of PO in the future put forward. 

Amorphous calcium phosphate modified zero-valent iron was successfully synthesized by co-precipitation method under nitrogen protection, and the adsorption of ponceau 4 R by amorphous calcium phosphate modified zero valent iron was explored. The effects of reaction time, reaction temperature, ponceau 4R concentration and the quantity of amorphous calcium phosphate modified zero-valent iron added on the adsorption capacity were studied to optimize experimental conditions. When 30 ml of 1 g/L ponceau 4 R solutions was added at room temperature, the best adsorption effect can be obtained when the adsorption time was 8 minutes. And the removal rate increases with the increasing of amorphous calcium phosphate modified zero-valent iron, and the maximum adsorption capacity is 133.3 mg/g. Pseudo-first-order, pseudo-second-order rate equation, intraparticle diffusion model, and Langmuir adsorption isotherm were used to analyze the adsorption process. The adsorption process conformed to pseudo-second-order kinetic equation. This study laid the experimental foundation for the treatment of printing and dyeing waste water.

Nitrogen-doped graphene quantum dots were synthesized by citric acid pyrolysis method. Based on the strong fluorescence quenching effect of Fe³⁺ on nitrogen-doped graphene quantum dots, a method for detecting Fe³⁺ was established. The study found that there is a good linear relationship between the fluorescence intensity of nitrogen-doped graphene quantum dots (F0/F) and the concentration of Fe³⁺.The linear range is 0.0185~0.5365 mmol/L. The detection limit is 1.73 nmol/L. At the same time, the effects of pH,temperature and time on the fluorescence quenching system were discussed, and the experimental conditions were optimized. The temperature quenching mechanism and thermodynamic calculations were used to investigate the mechanism of fluorescence quenching. It was shown that the process is a spontaneous、exothermic、dynamic quenching process, and the detection of Fe3+ in foods was realized. It provides a theoretical and experimental basis for the establishment of new fluorescence sensors.

Barite dissolved by aqua regia and hydrofluoric acid soluble salt, dried to remove silicon by hydrochloric acid leaching, and then through filtering, washing and burning constant weight, quick got the amount of barium sulphate and strontium sulphate. Through the X-ray fluorescence spectrometry, the content of strontium sulfate was determined by the calculation of barium sulfate. This method was simple, fast, and efficient.

Fe₃O₄@SiO₂@CPB magnetic nanoparticles were prepared by a simple synthesis method and characterized by transmission electron microscopy (TEM). The effects of the initial concentration of congo red, the reaction temperature and the pH valueon the adsorption effect were studied．The results showed that the adsorbent has better adsorption capacity for congo red. The amount of adsorption increases with the increase of congo red concentration and temperature, while the pH had little effect on the adsorption amount. The adsorption kinetics showed that the Fe₃O₄@SiO₂@CPB adsorption process for congo red was more consistent with the pseudo second-order reaction model. The isothermal adsorption linear fitting showed that the adsorption process was more in line with Langmuir adsorption, and the maximum adsorption capacity was about 434.783 mg/g.

Solid phase microextraction and gas chromatography were used to analyze the adsorption properties of sulfuric acid acidified activated carbon for hydroxyacetone of in phenol’ impurity. The results showed that the extraction time 10 min, extraction temperature 30℃ and resolution time 4 min were the best solid-phase microextraction conditions. Sulfuric acid acidified activated carbon has good adsorption ability to hydroxyacetone, and the best adsorption effect is when the adsorbent mass is 1.0g. Adsorption time was 3h, adsorption reached equilibrium, and the removal rate was 60%. The pseudo-second-order kinetic model can better describe the adsorption behavior of hydroxyacetone on sulfuric acid acidified activated carbon.

The cetylpyridinium-chloride-modified magnetic diatomite were prepared and characterized by FTIR. It is used for the removal of dye methyl orange in waste water. The influence of time, pH, temperature, and other conditions on the adsorption properties of CPC-magnetic diatomite is studied. The kinetics model of adsorption corresponds to pseudo-second-order kinetics. The isothermal adsorption model showed that the adsorption was in accordance with the Langmuir model.

Purpose: the optimum technological conditions for the extraction of corn oil by supercritical CO₂ were studied. Methods: the extraction rate of corn oil by supercritical CO₂ was the evaluated method, and the extraction process was optimized by single factor and orthogonal experiment. Results: the optimum extraction conditions were as follows: the extraction pressure 25 MPa, the extraction temperature 40 °C, the particle size 50 mesh sizes, and the extraction time 50 min, the extraction rate can reach more than 24.54%. Conclusion: the optimized process of supercritical CO2 extraction of corn germ oil is simple and stable.

Hippophae rhamnoides polysaccharide is one of the main functional components of Hippophae rhamnoides, which is rich of a high biological activity. In this paper, the extraction, purification methods and their biological activity of Hippophae rhamnoides polysaccharides are summarized in order to provide the reference in food, health care products and pharmaceutical fields, etc. for industrial production. 

To explore the determination method of chrome-element and the optimization of the determination condition, and to provide the reference for the quality control of the Radix isatidis. Using microwave digestion - graphite furnace atomic absorption spectrophotometer; There was a good linear relationship between 0 ~ 20 ng/mL and the linear correlation coefficient was 0.999.Optimization of the ashes of the furnace temperature, graphite in the ashing temperature is 1000 ℃ instrument to achieve the best working state. The determination of heavy metal elements in the radix isatidis chrome no provisions in the《Chinese pharmacopoeia》, there is no research in this field, as one of the harmful elements of chromium in the aspect of quality control in the future will be essential. Experiments by microwave digestion of samples at different temperatures was dispelled, atomization device using graphite furnace atomic absorption spectrophotometer determination of chromium in the samples, received good results, can for the future on the determination of chromium in radix isatidis lay a good foundation.

The reason for fracture of steam turbine regulating valve stem is analyzed by macroscopic examination, fracture analysis, component examination, hardness testing and metallographic observation. The results show that chemical composition of the invalid stem is in accordance with the requirements of the GB/T 8732-2014 standard. The microstructure of the invalid stem is martensite. The hardness value of the stem is in accordance with the GB/T 8732-2014 standard. Machining marks exist in the retreating slot position of the stem and the larger surface roughness is the reasons for fracture. The valve stem bears the cyclic tensile stress for a long time during the operation of the unit, of which fatigue cracks produced in the root chamfering position with greater stress concentration, leading to the fracture of valve stem.

Process analysis on the slip cover was carried out; filling analysis on different gates was proceeded to choose the better one, packing and cooling and warpage analysis on the design of cooling system and different molding process schemes were implemented to verify the rationality of cooling system and to ensure forming quality of plastic parts; the injection mold was designed with UG software, which shortened design time.

Relief valve and sequence valve in the hydraulic system are all belong to the pressure control valve. The principle and structure are very similar, but each has its own characteristics in practical application. How to make reasonable application according to their characteristics is essential. The paper compares and analyses structure and working principle of relief valve and sequence valve and analyses the structural differences of the relief valve, sequence in different applications, and combining with the actual work case. It summarizes the working characteristics of the typical application of relief valve and sequence valve and provides a reference for engineering and technical personnel for the application and selection of relief valve and sequence valve.

The series mechanism of crank and rocker and sine mechanism are wildly used in construction machinery, agricultural machinery and mining metallurgical machinery as a mechanism of machinery and instrumentation. This work focus on the motion state of mechanism and a virtual simulation mechanism model was designed by ADAMS software. The parameter of the model can be changed and the different kinematic joints and motions can be added to meet different requirements. The motion states of the bars can be analyzed by this model to solve the problems of practical engineering and mechanical motion.

The Computational Fluid Dynamics (CFD) method was used in this study to test the defrosting effect of the air conditioner vents in a car of a certain brand. And the defrosting effect on the windscreen was simulated, build a model of the vents and the car, and the software was used to simulate the air flow in it, after which, the vectogram of the simulated defrosting effect and the air flow could be obtained. The dissertation analyzed the vectogram of the simulated defrosting effect and the air flow got from the simulation to learn the distribution of the velocity field, the flow distribution at the air outlets and the deicing performance. Against the shortcomings, the structure of the vents was optimized improve the original one.

In the PLC practice teaching of process control, by establishing the object in the SIMIT software to achieve the process control simulation system, the difficulty to simulate the controlled device can be effectively solved. Experiments indicate that the simulation control system based on SIMIT has the advantage to accurately simulate the control process of controlled device without real experimental facilities, as well as the features of easy operation and flexible development. In this paper, a coating production process is illustrated to introduce the simulation process of process industry based on SIMIT.

Polyvinylidene fluoride membrane has been modified by surface to study the filtering performance. The modified membrane is prepared by operating pressure, concentration of ferric hydroxide colloid. The surface of membrane is confirmed by SEM measurement, The performance of modified membrane is measured by pur water flux, BAS retention rate, contact Angle, and the requirements of the ultrafiltration membrane is confirmed by flux, retention rate and contact angle.

Taking 107 university laboratory accidents during 2001-2016 years as samples, it is very important to analyze the cause of laboratory accidents, because of the accidents happened frequently. Applying hazard theory to analyze the causes of fire and explosion accidents, the results show that concrete forms of the critical inherent factors including combustibles, chemical and heat energy, as well as trigger factors like violation and careless operation, faults and defects of instruments and their protection devices of the accidents can be found, according to statistical data. As the key points of laboratory safety supervision in universities, some countermeasures are put forward, namely life-cycle management, education and comprehensive training, spot inspection management to hazardous chemicals, personnel and equipment respectively. It provides reference for the prevention of laboratory accidents and improvement of laboratory management system in universities.

In order to solve the equipment is expensive, complex structure, strict confidentiality, and many other factors, leaving acute shortages of equipment for teaching and training, aircraft maintenance engineering student skill levels to increase this problem, proposed the full use of the virtual simulation and virtual assembly technology to build aircraft annex 3D digital repository, and for some of the key problems in the construction of solutions are put forward.