Nitrogen is one of the main factors limiting the productivity of various ecosystems. Soil organic nitrogen must be transformed into inorganic nitrogen (mainly ammonium nitrogen and nitrate nitrogen) that can be absorbed and utilized by plants through the action of soil microorganisms. This process is called nitrogen mineralization. The desalination ability directly reflects the nitrogen supply capacity of the soil and directly affects the amount of nitrogen fertilizer applied. Nitriding capacity is mainly related to the temperature and humidity in the soil. In 1972, Stanford and Smith published a classic article stating that In the temperature range (-4~40°C), the nitrogen mineralization rate increases as the temperature increases. In this paper, the research on this point is carried out. The detection and control of the soil moisture temperature can be measured and analyzed using the soil moisture temperature recorder. Water-assisted injection molding: Water-assisted injection molding technology is an advanced injection molding process in which part of the melt is injected into the mold cavity and high-pressure water is injected into the melt through the equipment to finally shape the workpiece.
Due to the incompressibility of water, the water front creates a solid interface, squeezing the inner wall of the product into a cavity, and the water front also acts as a rapid cooling. Therefore, the water supplement has many advantages over the gas supplement. Research and application show that the water supplement can produce thinner and more uniform cavity wall, and the inner surface of the flow channel is very smooth. Especially for thick wall workpiece, the cooling time can be greatly reduced compared with gas auxiliary.
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The soil moisture temperature recorder was used to control the soil temperature at 5, 15 and 25°C. The soil moisture content was controlled at 30%, 50% and 70%. The soil nitridation was performed by measuring the soil nitrate nitrogen and ammonium nitrogen. After the determination of the content and the determination results, the data of the two were analyzed and processed. It was found that nitrification was dominated by the mineralization process, and the suitable mineralization temperature range varied with the soil type, which was a manifestation of the evolutionary adaptation of nitrifying microorganisms. This study found that under the same water conditions, the maximum net mineralization rate appeared at 25°C, and the net mineralization rates at 5 and 15°C were significantly lower than 25°C, indicating that the net mineralization rate had a turning point at 15°C, indicating that there was 25°C In favor of nitrification of black soil, the critical temperature of nitrification in the soil of alfalfa grassland in autumn is about 15°C. At low temperature, both ages show net nitrogen retention. Under low temperature conditions, nitrogen mineralization mainly accumulates NH4+-N, which is expressed as nitrogen retention. This is because the process of nitrification is slowed down at low temperature, and nitrifying bacteria are more important than ammoniated microorganisms. It takes longer to adapt to the cold environment. As the culture temperature is gradually reduced, the microbiological nitrogen and total nitrogen retention rate will also increase due to the growth of suitable microbial populations.
From the correlation between temperature and net mineralization rate, it can be seen that the net mineralization rate is positively correlated with temperature, and the determination coefficient between the net nitrogen mineralization rate and temperature is basically higher than the determination coefficient between the net mineralization rate and moisture. Temperature is the main factor that determines the rate of mineralization.
High gloss injection molding: Highlights the basic process of injection molding is prior to injection molding, through the use of high temperature and high pressure steam will mould surface rapidly warming, the forming die cavity surface temperature of resin plastic glass transition temperature (Tg) above, then the plasticizing good plastic melt into the closed mold cavity, the injection stage, mold temperature by high temperature and high pressure steam remains the same, When the injection is finished, the air supply is stopped, and the water vapor in the pipe is blown clean by air pressure of the air pipe. After that, the cooling water is injected to make the mold temperature drop rapidly until the mold is cooled and the product is removed by opening the mold