Search

The hydrofluoric acid-resisting aluminum compounds (AlF3, AlPO4, AlN) supported with Ni catalyst were prepared by the wetness impregnation and tested for dehydrofluorination of hydrofluoroalkane to synthesize fluoroolefins. It is found that Ni/AlF3 catalyst has the best catalytic performance, CF3CFH2 conversion of 29.3% after the reaction at 430 °C for 30 h, CF2HCH3 conversion of 31.8% after the reaction at 250 °C for 30 h, respectively. Comparatively, dehydrofluorination temperature of CF3CFH2 is higher than CF2HCH3 over the aluminum compounds catalyst, and the activity of catalysts is related with Lewis acidity. For the aluminum compounds catalyst, addition of Ni had promoted the activity and stability of Lewis acidic catalysts, it is attributed to synergistic catalysis of Lewis acid sites and Ni.

At present, the main conventional method to study pollution diffusion is to establish a mathematical model to analyse the relationship between pollution sources. The lack of analysis on the characteristics and attributes of pollution sources leads to unsatisfactory identification results. To solve this problem, a pollution diffusion prediction method based on pollution atlas was proposed. The pollution knowledge graph was constructed to describe the relationship between pollution source attributes and the interaction and influence between pollution source and region. The diffusion characteristics of pollution were extracted from the atlas, and DBSCAN was used to achieve clustering and deep neural network model was built to predict the pollution degree at different depths. The model is verified in a typical contaminated site. The experimental results show that the proposed method is effective and has good recognition effect and convergence speed.

Boasting exemplary national qualities and high educational value, Red Culture is a unique spiritual wealth that make the Chinese nation stand out from the rest nations. Under the new media environment, however, the collision between the disparate characteristics of Red Culture and new media has given rise to the predicament plaguing the communication of Red Culture. With the advent of the 100th anniversary of the founding of the Communist Party of China, both tangible and intangible cultural heritage and resources are being valued, tapped and cultivated across the country. With the cultural and creative industry in the ascendant, the concept of intellectual property (“IP”) has seeped into all aspects of our everyday lives. Against that backdrop, this study attempts to explore novel ways to link up the Red Culture resources scattered across China, to combine education with cultural tourism through the “4+5+2” cultural and creative IP empowerment model, and to pass on and spread Red Culture and add new value to the industry on the strength of influential IPs.

Biological invasion seriously threatens ecological stability and social development. One of the bases for forming invasion is alien species’ strong phenotypic plasticity. Phenotypic plasticity can help alien species adapt to environmental changes and enhance their invasive ability. China is one of the countries seriously affected by drought. Under the background of environmental drought, exploring the reasons why invasive plants can gain growth advantages and mastering the phenotypic changes of invasive plants in response to drought stress are conducive to helping us understand more about the invasion mechanism of invasive species. In this paper, the research progresses of invasive plants’ morphological plasticity and physiological plasticity under drought stress in recent years are reviewed, the invasive plants’ morphological and physiological metabolic characteristics under drought are summarized, and the growth advantages of invasive plants are discussed, which provided a scientific theoretical basis for alleviating the serious harm caused by biological invasion to China’s natural environment.

Based on the field survey data and relevant literatures, the evaluation index system of plant priority protection, which consists of threatened coefficient, genetic coefficient and species coefficient was established. Quantitative study and comprehensive evaluation of plant resources in Liangzi Lake Nature Reserve were carried out, and protection levels were classified. The results showed that there were 254 plant species in nature reserve, including 18 endangered species, 46 vulnerable species, 76 lower risk species and 114 safety species. The coefficients of threatened, genetic and species were analyzed and calculated by the indexes and proportion weights. The priority protection order of plants was determined, including 12 species of the first class conservation, 18 species of the second class conservation, 33 species of the third class conservation and 191 species of the delayed conservation. The corresponding protection suggestions were put forward. The purpose is to provide theoretical guidance for plant protection work and to help protect biodiversity of Liangzi Lake Nature Reserve.

To make people at different places participate in the same conference, speak and discuss freely, the interactive remote video conferencing system is designed and realized based on multi-Agent collaboration. FEC (forward error correction) and tree P2P technology are firstly used to build a live conference structure to transfer audio and video data; then the branch conference port can participate to speak and discuss through the application of becoming a interactive focus; the introduction of multi-Agent collaboration technology improve the system robustness. The experiments showed that, under normal network conditions, the system can support 350 branch conference node simultaneously to make live broadcasting. The audio and video quality is smooth. It can carry out large-scale remote video conference.