Plant is an important component of wetland ecosystem, which has a great influence on the purification of sewage by constructed wetland. Two woody plants, Bischofia javanica Bl. and Sapium sebiferum (L.) Roxb, were selected to construct different nano-modified filler constructed wetland systems. The effects of woody plants on the removal of total nitrogen (TN), ammonia nitrogen (NH+4-N), nitrate nitrogen (NO-3-N) and total phosphorus (TP) in domestic sewage were studied by simulating constructed wetlands, which provided a theoretical basis for the application of woody plants in constructed wetlands. The results showed that S. sebiferum (L.) Roxb (S), B. javanica Bl. (A), filler + S. sebiferum (L.) Roxb (FS), filler + B. javanica Bl. (FA) and filler treatment system (F) had certain removal effects on NH+4-N, NO-3-N, TN and TP. The removal rates of TN and TP by FA system were 63.64% (6 d) and 82.92% (6 d), respectively. The removal rate of NH+4-N by filler + S. sebiferum (L.) Roxb (FS) system was 88.30% (6 d).

In order to solve the problem of eutrophication of water bodies caused by the discharge of a large amount of substandard domestic sewage into the river. A vertical flow artificial wetland was constructed using nano-mixed packing as the substrate,the Myriophyllum verticillatum L. as the wetland plant, and the domestic sewage was treated as the object. The removal effects of ammonia nitrogen (NH+4-N), total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand nitrogen (COD) in domestic sewage in constructed wetlands and the purification effects of domestic sewage were analyzed. The results showed that (1) nanofillers had a greater effect on the purification effect of wastewater, and their average removal rates of COD, TN and NH+4-N could reach 88.7%, 93.4% and 97.0%, respectively, which were 7.91%, 10.99% and 11.02% higher than those of the system with pure sand without nanofillers added, respectively. (2) The planting of foxtail algae could improve the removal effect of the system on pollutants. The removal rates of COD, TN and NH+4-N in CW-2 were 6.52%, 11.86% and 7.31% higher than those in CW-1, respectively, and the removal rate of COD, TN and NH+4-N of CW-4 were 0.48%, 6.93% and 3.71% higher than those of CW-3, respectively.

In order to develop a new dietary Chiffon cake with low-calorie, the millet flour was added into the traditional Chiffon cake. The effects of millet flour, sugar, egg yolk, milk and egg white on the quality of cake were studied by terms of sensory evaluation and texture profile analysis parameters. The optimal formula of millet Chiffon cake was optimized by response surface methodology. And the secondary structure of gluten protein was analyzed by Raman spectroscopy. The optimized formulation was as follows: millet powder 6.87 g, egg yolk 45.25 g, sugar 45.13 g, milk 28.95 g, wheat flour 43.13 g, egg white 90.00 g, salad oil 25.00 g, baking powder 1.00 g, lemon juice 2.00 g. Under this formula, the millet Chiffon cake was golden in color, rich in aroma, soft and delicate in taste, with a sensory score of 85.95 points. The Raman spectroscopy results show that: by adding appropriate amount of millet flour, the proportion of β-sheet structure in cake protein increased significantly, which made the cake protein network more compact, then improved the texture characteristics of cake.

The mining of critical nodes has a wide and important potential application in studying network structures and performances. A topology-based critical node mining algorithm is proposed to solve the critical node problem. The algorithm mines the community structure of the network and selects a set of nodes based on topological centrality indicators. Then, this node set and part of the original network are iteratively exchanged to optimize the network connectivity index. At the same time, an improved local search and weighted random selection mechanism are adopted to strengthen the search ability and overcome local optimal traps. In addition, a node centrality indicator based on network topology is proposed to improve the quality of the initial solution. Experiments on multiple synthetic and real network datasets between the proposed algorithm and other advanced algorithms show that the proposed algorithm has better accuracy and robustness.

The problem of asymptotic generalized synchronization is investigated for a type of multi-linked networks with different dimensional partial similar nodes, uncertain structures, uncertain disturbance and time-varying delays via the decentralized delaydependent control method. For the case that the outer coupling link weight in the network is uncertain and its bound is also unknown in advance, decentralized delay-dependent controllers and parameter update laws are designed to realize the asymptotic generalized synchronization of our multi-linked networks. The correctness of the proposed decentralized delay-dependent control strategy is proved by the Lyapunov stability theory and the Barbalats lemma. Finally, a numerical example is provided to illustrate the effectiveness and correctness of the proposed theoretical result.

The existence conditions and stability of positive equilibrium point in discrete three-dimensional competitive system is discussed. The necessary and sufficient condition of existence for the positive equilibrium point in such competition system is obtained. Some sufficient conditions of asymptotic stability for the positive equilibrium point are established. Some areas are obtained such that the positive equilibrium point is no asymptotic stable in it. At the same time,conditions of never harmony of the groups and harmony symbios of the groups in this competitive system are established.

Since the end of the Cold War, the world economic and trade patterns has changed significantly. The first performance is the graduate recession in the US-led western developed countries and the rising in developing countries, led by China. Second, the field of trade in services has developed rapidly, with trend to catch up with trade in goods. The evolution of trade rules has gradually shifted from multilateral to bilateral and regional trade. In terms of the development of agricultural international trade, because agriculture itself is greatly influenced by resources endowment and environmental elements, short-term agricultural pattern of international trade will not change. The United States remains the world's first agricultural superpower, and this trend is stable. At the same time, agriculture in the BRICS countries, led by Brazil, keep rising and plays an increasingly important role on the world stage. In the post-epidemic era, the international agricultural market will fluctuate greatly, and the supply-demand relationship, market structure and price level of agricultural products will change accordingly, which will have a huge impact on countries with a high degree of dependence on agricultural trade, while countries with a low degree of dependence on agricultural trade will be relatively less affected.

Based on the perspective of “interest & relationship network”, the theoretical framework of social capital of cooperatives is constructed and the formation mechanism of social capital of cooperatives and the function mechanism of social capital in different development stages of cooperatives are analyzed. The results show that consolidating the cooperative relationship network based on interests through trust mechanism can promote the accumulation and formation of social capital of cooperatives. The “interest & relationship network” has created a good environment for the promotion of trust among internal members. The evolution of social capital from “acquaintance trust” to “system trust” and then to “citizen trust” has promoted the orderly establishment, steady growth and rapid maturity of cooperatives.

In recent years, persulfate (PS) activation based advanced oxidation technology has been widely used to degrade various organic pollutants in water due to its simple operation, high efficiency and environmental friendliness. In this paper, the ways of activating PS and the effects of the main factors including pH, PS and activator dosage on the degradation of organic pollutants were summarized, and the free radical mechanism and non-free radical mechanism of the degradation of organic pollutants by activating PS process was discussed. Finally, the possible problems of PS activation based advanced oxidation technology at present and to the future development direction were also discussed.

Camellia oleifera is a unique woody oil plant in China，which is widely distributed in the acidic red soil area south of the Yangtze River. As a common abiotic stress，aluminum stress has a great impact on the growth and development of Camellia oleifera. The effects of aluminum stress on the growth，development and physiological and biochemical indexes of Camellia oleifera were summarized in this paper. The latest reports on the stress response mechanism of Camellia oleifera and the molecular basis of aluminum tolerance of Camellia oleifera， as well as the various physiological pathways of phosphorus to alleviate the stress of Camellia oleifera.The to future research on the aluminum stress and aluminum tolerance of Camellia oleifera was prospected in order to provide a scientific basis for the development of Camellia oleifera industry.