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This paper summarizes the research progress of sludge resource utilization technology, analyzes the mechanism of different pretreatment processes on the dissolution of sludge substances and the dissolution effect, and compares the advantages and shortcomings of different pretreatment methods; summarizes the resource recycling and utilization pathways such as protein recovery, alginate recovery and anaerobic fermentation after sludge pretreatment; and provides suggestions and perspectives on the engineering application of sludge pretreatment and resource utilization. The recommendations and prospects for the engineering application of sludge pretreatment and resource utilization are also provided. [ABSTRACT FROM AUTHOR]

The water depth was predicted using a fully empirical mode decomposition-long short-term memory neural network model (CEEMDAN-LSTM) based on adaptive noise. First, the data is preprocessed by the median average filtering method, and then the historical water depth sequence is decomposed by the CEEMDAN method to obtain the high, low frequency and residual sequence of the historical water depth, and then the obtained components are predicted by LSTM neural network, and finally stacked The prediction value of each component reconstructs the water depth prediction result. Taking Taocha Canal Head as the research object, the test results of CEEMDAN-LSTM model show that the model has stronger performance than support vector machine regression, BP neural network, long short-term memory neural network, empirical mode decomposition-long short-term memory neural network model. prediction performance. [ABSTRACT FROM AUTHOR]

The hazards of sludge, the status quo of treatment and disposal, and the preparation process of sludge ceramsites were summarized・ The application and mechanism of sludge ceramsites in the adsorption of nitrogen, phosphorus, heavy metals, organic matter and turbidity removal are systematically reviewed, so as to provide a reference for sludge ceramsites in the field of sewage treatment. The limitations of sludge ceramsites in water purification are analyzed, and its future development direction is prospected. [ABSTRACT FROM AUTHOR]

The synthesis and properties of PLA fiber are introduced, and the research progress of PLA fiber blending modification and composite material development for textile field in recent years is described・ Through modification and development, the properties and applicability of PLA fiber in the field of textiles are enhanced, the synthetic methods of materials are improved, and the PLA fiber is further promoted to the market. [ABSTRACT FROM AUTHOR]

The extraction of inulin from Jerusalem artichoke was carried out by hydrothermal method. Through designing single factor experiment, three main factors affecting the extraction temperature, time and phosphoric acid concentration were determined. Using response surface method for optimal analysis of the extraction process of inulin, using the Design-Expert software to design three factors and three levels of experiments, obtained the best extraction conditions of inulin; water bath temperature 87 °C, extraction time 82 min,phosphate concentration 0.7 g/L,under this condition,the extraction rate of inulin reached 22.44%. The results are consistent with the predicted values, which proves that the prediction model is effective and can be used to optimize the extraction process of inulin. This study provides theoretical basis and data support for the further development and utilization of Jerusalem artichoke in plateau area. [ABSTRACT FROM AUTHOR]

Mitika is an important representative plateau wetland in China. In order to study the spatial distribution characteristics and pollution status of heavy metals in the surface soil of the wetland, 25 surface soils were collected. The pollution of heavy metals (Cu, Zn, Cr, Ni, Pb, Cd, As and Hg) in wetland soil was evaluated by geo-accumulation index method and potential ecological risk index (RI). The results showed that the average concentrations of Cu, Cr, Ni and Pb in wetland soil in the study area were lower than the background value of Tibet soil, while the average concentrations of Zn, Cd, As and Hg are 1.11, 1.75, 1.15 and 1.53 times of the background value respectively, which was far lower than the risk screening value of GB 15618-2018 soil environmental quality standard, standard for soil pollution risk control of agricultural land (Trial); Except that the accumulation index of Cd element was 0.08, which was slightly polluted, other elements were at the pollution-free level; The potential ecological risk in the study area was moderate, which was mainly related to the accumulation of Hg in the environment and the local low background value; Cu, Zn, Cr, Ni, Pb, Cd and As were mainly from natural sources. Hg was greatly affected by human activities, which brought certain risks to the ecological environment and need to attention. However, the overall environmental quality of wetlands was better than that of other wetlands in China. [ABSTRACT FROM AUTHOR]

In order to improve the quality of environmental science by graduate practice, according to the practical problems in the process, advantages are used to enhance the level of teachers. The introduction of excellent educational resources and the diversification of teaching methods, have promoted the students learning foundation and skill. To promote the construction of the practice base, form a scientific management system with the effect of the top disciplines and the training of counterpart talents, reform and exploration of the transformation of assessment methods are completed. These enhance the students’ professional comprehensive quality, and present suggestions to ensure the effective output of environmental protection talents in Tibet. [ABSTRACT FROM AUTHOR]

【Objective】 It is of great interest to understand the mechanism underlying breast milk quality for immune disease research. 【Method】 The expression changes of let-7a and let-7f miRNAs were analyzed in porcine milk exosomes across the entire lactation period (newborn to 28 days after birth) by quantitative real-time PCR. 【Result】 let-7a and let-7f were more abundant in the early lactation period (0 and 3 days) than in the later lactation period (7, 14, 21 and 28 days), and were expressed at higher levels in Meishan pigs compared with Yorkshire pigs throughout the entire lactation period. 【Conclusion】 This study is a preludetoin-depth investigations of the essential roles of breast milk exosome-packaged m iRNAs in the development of the infant's immune system. [ABSTRACT FROM AUTHOR]

Statistical analyses were done to explore the reproductive, fattening and carcass performances of Chuangzang specific dam line Black Swine. The result showed that: its little size and live little size were relatively high, the Primiparous litter size of 0 - 4 generations were all over 10, its pluriparous litter size was over 12, the primiparous and pluriparous little size of the forth generation were respectively 11. 19 and 12. 37, the primiparous and pluriparous little size gradually increased with breeding generations. Daily gain, feed conversion, the day to 75 kg body weight, and live backfat of F01 were respectively 432. 25 g, 3. 43 ,209. 87 days and 23. 02 mm, which respectively in creased by 5. 39 %, 5 .7 % , 7. 21 % and 11. 26 % compared with 0 generations. The lean meat percent of F01 was 43. 69 % to the fifth generations, which increased by 1. 54 percentage points. Its hog had excellent pork quality, it's intramuscular fat was 4. 77 % , and pH, LF, OPTO, tenderness and other indicators were within the range of excellence, and it's an ideal dam breeding. [ABSTRACT FROM AUTHOR]

The experiment was conducted to compare the thiamine content in longissimus dorsi muscle of Chuanzang black pigs and DLY pigs with different stages (90, 110 and 130 kg). The results showed that the thiamine content were 1. 77,2. 16 and 2. 83 μg/g in longissimus dorsi muscle of Chuanzang black pig at 90,110 and 130 kg, while the thiamine content were 1.29, 1.63 and 1.94 μg/g of DLY. We also found that the thiamine levels were significantly higher in Chuanzang black pigs than those in DLY pigs at 90, 110 and 130 kg (P90kg < 0.05, P130kg <0.05). Correlation analysis showed that thiamine levels were highly correlated with weight (P < 0. 01). These differences in levels of the thiamine may also have indications for meat quality. Our study revealed the deposition law of thiamine in longissimus dorsi muscle at different developmental stages of the two pig breeds. This study also provides data for further study on the pork flavor. [ABSTRACT FROM AUTHOR]

The intramuscular fat (IMF) in Longissimus dorsi muscle of the pigs at different stages (90,110 and 130 kg) were measured with automatic extraction and classical soxhlet methods. The results showed that the repeatability limit requirements were up to a given standardand performed a strong positive correlation (P <0. 01) between two methods. Moreover, it was also found that there was no significant difference of IMF in the Longissimus dorsi muscle between two methods (P >0. 05). These results indicate that the IMF was more thoroughly extracted and the fat rate was higher with the traditional extraction technology than that with the automatic extraction, while the automatic extraction exhibited more efficient, safety and environmental protection. [ABSTRACT FROM AUTHOR]