The development history and technical overview of HPPO process by direct oxidation of hydrogen peroxide are reviewed at home and abroad, including the technical features and process flow of Basf/Dow chemical, Evonik/Uhde company, Sinopec and Yida chemical. The mechanism of HPPO process,the conditions of side reaction, the choice of reaction solvent and the purification method of PO are analyzed in detail. Some key problems in HPPO production process are put forward.

Aiming at the problems of traditional blackboard eraser, such as fugitive dust, incomplete wipe and poor use effect, etc. The article designed a negative pressure adsorption dustless blackboard eraser. The blackboard eraser is separated by a coarse filter net, with a compressed cavity inside. The negative pressure generated by fan drainage is used to absorb the dust generated by cleaning in real time. Through fluid simulation analysis and experimental test, the dust absorption rate can be more than 90%. At the same time, the blackboard eraser adopts wireless automatic charging, which has super-long standby performance.

At present, the development of the second-hand auto market is extremely rapid. According to statistics, from 2000 to 2017, the number of second-hand auto transactions rose from 251,700 to 12,409,900, an increase of 49 times. With the increase of the penetration rate and the average age of cars, the volume of used cars in China will continue to increase in the next five years at a rate that exceeds the trading volume of new cars, forming a two-trillion-yuan used car market pattern. With the further development of the domestic car market, the number of new vehicles has been increasing, and consumers are eager to change their cars. The urgent demand has become increasingly prominent. The prospects for the development of the used car market are very broad.

Storm Water Management Model (SWMM) is a widely used urban rainwater simulation and analysis software, the sub-catchment is the basic calculation unit in the SWMM model. Through the analysis of the rainfall runoff hydrological conceptual model, runoff yield and concentration mathematical model for SWMM sub-catchment, some suggestions on parameter assignment are put forward the application. In order to solve the problem of sub-catchment width value assignment，this paper proposes to take the length of the overland flow path as the basic method to calculate the width of the sub-catchment area, and to calculate the length by weighting the length of sub-catchment concentration.

The carbonylative coupling reactions of aryl halides are effective way to synthesize carbonyl compounds. There are more valuable to realize the carbonylative coupling by C-H unactivation. In recent years, transition metal-catalyzed carbonylative coupling reactions have attracted  more attention. But more energy will be needed in the cleavage process of C-H and the demands of the structure of substrates and types of catalyst are very harsh. We summarize the advances in transition metal-catalyzed carbonylative coupling by C-H bond activation from the point of the types of catalyst.

Alkaline phosphatase (ALP) exists widely in human body and controls the processes in various physiological organisms. At present, it has been widely used in clinical, biological, medical and other fields. As a key biomarker of many diseases and a major tool of enzyme experiments, the classical ALP analysis methods cannot meet the new requirements of sensitivity, accuracy, anti-interference and wide range of targeted sample types. In order to better study ALP detection technology, this paper describes a variety of extraction and detection methods, including the latest ALP detection technology at home and abroad. At the same time, we summarize and compare the main advantages and disadvantages of these studies. At the same time, the future development prospects and trends are discussed, hoping to provide some inspiration for future work.

With the development of China's military and civil aviation industry, the demand for aviation maintenance personnel is becoming unprecedentedly urgent. In order to cultivate personnel with strong professional skills and high professional quality, Jilin Institute of Chemical Technology has worked out an Aeronautical Maintenance Specialty in higher vocational education through continuous exploration and practice. By designing the cultivation target, specification, process and training mode, organizing teaching activities effectively, allocating teaching resources reasonably, making training scheme for military and civilian personnel and applying it into teaching practice, the researchers achieved the desired teaching effect.

Composite electrolytes were prepared by doping carbonates (Li₂CO₃ 53 mol% and NaCO₃ 47mol%) with different mass fractions (10%, 20%, 30%) into electrolyte (GDC). The electrochemical properties of the composite electrolyte were characterized by conductivity test and scanning electron microscopy (SEM). Anode powder was prepared by doping composite electrolytes into NiO, and the cathode powder was obtained by compounding the composite electrolytes with Li-treated NiO.The anode, cathode and electrolyte prepared above were pressed by dry pressure method to obtain a single cell supported by the anode.  The performance of the cell was characterized later. The results of electrochemical performance of single cell show that GDC with 30% carbonate has the highest power density, which is 1400 mWcm^-2 at 600 C.

Artificial Intelligence, as a branch of computer science, has been applied and developed in education industry in recent years. Higher education is the main place for training talents in our country, and it is also one of the best application scenarios of artificial intelligence. Among them, image processing technology is becoming more and more mature. Face recognition access control has gradually entered people's lives. Integrating artificial intelligence face recognition with laboratory entrance guard, obtaining students'face information from university student database, uploading it to face database in batches, and combining the entrance guard system with the administration system, students can make experiment appointment, brush their faces into the door, and input attendance information into the educational administration system. The application of this system promotes the development of educational informationization and realizes University laboratory. Intelligent management.

Exhausting CO₂ in time and effective transferring of methanol solution to the diffusion layer have important influence on the performance of the liquid feed direct methanol fuel cell (direct methanol fuel cell, DMFC). VOF has been used to study the evolution of CO₂ gas which leaked from the parallel channel, including growth, deformation, detachment and motion of the bubble. A three-dimensional model of channel has been established to study the effect of wettability on bubble evolution in channel. The software FLUENT was used to simulate and analyze the diffusion layer wall surface of hydrophilic (35^o), neutral (90^o),weak hydrophobic (115^o) and strong hydrophobic (125^o)。The analysis results show that the bubble is jointly by the pressure difference between the two phases, and surface tension effect as well. The surface of the weak hydrophobic diffusion layer is conducive to the process of bubble separation and bubble coalescence, that is, it showed bubble discharging is more stable compared with the hydrophilic surface, while smaller bubble volume and shorter escaping time compared with the strong hydrophobic surface.