Search

The innovative development of green technology is the permanent scientific research topic in the field of grain storage, and the controlled atmosphere is one of the green grain storage technologies. This paper carried out the research on the storage technology of high-quality indica rice in the fifth ecological area of grain storage (medium temperature and high humidity) by air-regulating agent. The concentration of oxygen, temperature and relative humidity of the storage environment were monitored, and the quality of high-quality indica rice was also evaluated. The results showed that the technology of air-regulating could effectively delay the quality deterioration of rice. Compared with the controlled group, the experiment group can maintain the concentration of oxygen in the confined space below 0.1% and the relative humidity at 70% during the 5-month storage period. The moisture content of the controlled atmosphere group was 0.98% higher than that of the controlled group. The fatty acid value was 1.34 mg (KOH)/100 g lower than that of the controlled group, while the freshness was 7 points higher than that of the controlled group. The above results showed that the air-regulating agent can adjust and control the oxygen concentration and relative humidity in the confined space according to the demand, which could achieve the purpose of preserving the quality and freshness of grain. It is a green, low-carbon and fresh-reserving new grain storage technology.

This paper studies transverse grain-cooling ventilation technology applied to 24m long-span warehouse in high temperature and humidity area. Application effect of transverse grain-cooling ventilation technology was evaluated by adopting district cooling ventilation mode. The results showed that the transverse grain-cooling ventilation by sub region in large-span warehouse had the advantages of faster cooling rate, better ventilation uniformity, remarkable water retention effect and lower consuming power. The temperature gradient along the cool air direction was less than 0.22 ℃/m. The ventilation water loss rate was 0.1% and consuming power rate was 0.10 kw·h/(t·℃). The consuming power rate is only 20% of the maximum consuming power rate index of 0.5 kw·h/(t·℃) which is defined in the “Grain and oil storage—Technology regulation of application of grain chiller”, (GB/T 29374—2012).

TSZ-6A strain-controlled triaxial apparatus was used to determine bulk density of wheat under different pressures and initial pressure porosity was tested by self-made porosity mete， the porosity values of samples under different varieties， water content and pressure were calculated according to the relationship between bulk density and porosity. The results showed that the porosity of wheat decreased with the increase of pressurewhich satisfied the power function relationship; The porosity of wheat increased with the increase of water content， which satisfied the quadratic function relationship; In a certain size range， varieties had no obvious effect on porosity.

Three triphenylamine‐ and s‐triazine‐based conjugated microporous polymers (TTPA, TTDATA, and TTMDATA) were prepared via the Friedel−Crafts arylation reactions under the catalytic action of CH3SO3H. In virtue of containing rich nitrogen atoms in their porous frameworks, the obtained TTPA, TTDATA, and TTMDATA possess good fluorescence sensing property for o‐nitrophenol (o‐NP) with high quenching coefficients of 1.54 × 104, 1.32 × 104, 1.33 × 103 L mol−1 and low limits of detection (LODs) of 2.44 × 10−9, 1.14 × 10−11, and 1.35 × 10−8 mol L−1, respectively. The fluorescent quenching mechanism of TTPA for selective sensing o‐NP is the photo‐induced charge‐transfer mechanism. However, the fluorescent quenching mechanisms of TTDATA and TTMDATA for selective sensing o‐NP have both the photo‐induced charge‐transfer mechanism and the resonant energy transfer mechanism. [ABSTRACT FROM AUTHOR]