To meet the R/D needs of polymer industry and industrialization of new polymer materials, an elongation rheologybased polymer deformation processing method for polymer material processing and molding is presented, which realizes the transformation of the principle and method of polymer material processing and molding from ‘shear deformation’ to ‘elongational deformation’. The structural principle and technical characteristics of the eccentric rotor plasticized transport device controlled by volume elongational rheology are elaborated, and the application advantages of this technology in self-reinforcement of general material processing and efficient processing of special materials are discussed. It is shown that the eccentric rotor plasticization transportation technology has obvious advantages such as good compatibilizing effect, excellent mixing and dispersion effect, less fiber breakage and fracture in multi-component plastic blending compatibilization modification, organicinorganic hybrid function modification and thermoplastic fiber reinforced modification, etc. as compared to traditional screw plasticization transportation technology. In addition, the volumetric compression and release effect of the eccentric rotor plasticizing and transporting device can strengthen the mass and heat transfer effect of melting and plasticizing process, greatly shorten the material thermomechanical process, and realize high-speed molding processing of extreme rheological behavior material.

A summary of the research status of composite material preforming and equipment at home and abroad is presented at first, in which the current problems in the forming process in terms of low labor-intensive manufacturing efficiency, difficult control of precise shape forming, and low degree of automation are analyzed. Then a digital three-dimensional weaving forming method and a variable curvature preform placement-winding-needle punching integrated forming method are proposed. Finally, some future development suggestions for composite material forming technology and equipment are put forward to promote the technology towards high efficiency, high performance, high quality, automation and digitalization, and upgrade the manufacturing level of fiber preform based composite components.

Carbon emission mitigation is the most urgent task for steel industry. Current status and developing trends of environmental treatment and low carbon emission technologies for worldwide steel industry are reviewed and analyzed in this paper. Low carbon ironmaking technology with hydrogen partially replacing coke should be given priority for the blast furnacebasic oxygen furnace process while hydrogen-enriched shaft furnace direct reduction technology for special steel production. Based on the idea of carbon capture and utilization (CCU), chemicals production using metallurgical waste gas is the most thorough yet reasonable and sustainable way for carbon emission mitigation of the steel industry. For this purpose it is necessary to gather the technology strength of steel, chemicals, energy, information and the other related industry to implement the SCENWI (steel-chemicals-energy networking integration) CCU project with near-to-zero carbon emission to accelerate the research on metallurgical waste gas capture, transportation and treatment technology, and develop chemicals production process and products. Meanwhile, it is critical to build an intelligent manufacturing network system with close combination, collaborative management and stable running based on the industrial internet platform and effectively resolve key bottleneck problems on system complexity, dynamics and fluctuation, aiming to completely solve the carbon emission problem and promote sustainable and high-quality development of the steel industry.

China's hydrogen industry is encountering temporary difficulties under the influence of the COVID-19 pandemic, but with the improvement of the situation of pandemic containing, it has ushered in new development opportunities. By reviewing the hydrogen energy development policies issued in China in 2020, it is concluded that the policies mainly focus on in the field of transportation, including research and development of hydrogen fuel cell vehicle technology, key equipment manufacturing and construction of hydrogen refueling station, while rail transit is one of the development focuses of hydrogen fuel cell technology in the future. In addition, hydrogen metallurgy is a new application field. Many metallurgical enterprises are cooperating with advanced countries in demonstration projects, which may promote to realize revolutionary green transformation of China's iron and steel industry. At the same time, green hydrogen coal chemical industry, green hydrogen trade and civil liquid hydrogen are also important directions for the future development. Under the current situation, it is suggested that China should make clear its national development strategy, actively expand new areas of hydrogen energy technology innovation, focus on high-quality hydrogen energy industry, boost China's energy revolution and industrial transformation and upgrading, and play a leading role in the process of hydrogen energy globalization.

According to the statistics of the United States Geological Survey in 2019, the world has identified 62 million tons of lithium resources, of which 59% are distributed in salt lakes. Since most of the salt lakes are high-magnesium-lithium salt lakes,. the extraction process is more difficult. It is desired to prepare an efficient high magnesium-lithium ratio salt lake adsorbent. The article classifies the existing adsorbents according into the different preparation materials and adsorption mechanisms of the adsorbent, summarizes the development status of ion sieve adsorbent, aluminum salt adsorbent, and natural mineral modified adsorbent, and summarizes the adsorption process. The comparative study shows that the natural mineral modified adsorbent has all the advantages of ion sieve adsorbent and aluminum salt adsorbent for lithium extraction. The preparation process is simple, with no waste generation, economic, environmental-friendly, high efficient, etc. In the lithium extraction process, attention should be paid to natural mineral modified adsorbents.

A number of cities have become powerful and diverse transportation nodes along the“Belt and Road”. According to their functions, these node cities can be divided into integrated transportation hubs, major ports, international hub airports, China Railway Express hubs and national logistics hubs. These cities are playing an important role in the backbone transportation network of "six corridors, six roads, multiple countries and ports". Seven of the world's top ten largest container ports are in China. The hub airports in the central and western regions as well as China Railway Express are developing rapidly. International connectivity of inland node cities has been significantly enhanced. The combined transportation hub system relying on urban agglomeration area has been becoming an important form. In the future, the transportation development of“Belt and Road”node cities will break new grounds, promote the in-depth integration of new technologies and transportation, promote the in-depth integration of all transportation modes, promote the in-depth integration of node cities and the local regional transportation, and promote the in-depth integration of transportation enterprises and the global industrial and supply chain. The focuses will be to strengthen the function of international transportation hub, optimize the integrated collection and distribution system, build world-class airport groups and port groups based on the local region, participate in the construction of the global transportation network, improve the supporting policy system, and support building a safe, reliable and efficient global transportation network.

This paper summarizes major practices of ecological protection in the lower reaches of the Yellow River. The problems of ecological protection and high-quality development in the lower reaches of the Yellow River are analyzed, such as water resources attenuation and water use rigid growth, ecological function degradation, serious environmental pollution in some areas, and the pressure of beach area treatment. Based on discussions of these issues, the general idea, key tasks and measures for ecological protection and high-quality development are proposed, including increasing investment in the lower reaches of the Yellow River, establishing ecological compensation mechanism, tightening ecological environment supervision and law enforcement, opening up information sharing platform, and improving the local legislation and standards.

New technologies such as digital twin and big data etc., have triggered people's new thinking on manufacturing mode. Therefore, this paper proposes a new model of big data manufacturing services driven by digital twin, combining with the important content of manufacturing services in the "Made in China 2025" plan. First of all, the research progress of intelligent manufacturing, digital twin and manufacturing service mode at home and abroad is reviewed. Secondly, an open architecture and operation logic of big data manufacturing mode driven by digital twin is proposed. Thirdly, the enabling technology of big data manufacturing service mode is studied from three aspects: the two world driven by digital twin and its description, the combination of digital twin and big data, and the model establishment and optimization of big data manufacturing service mode. This new manufacturing service model has theoretical and practical significance for promoting the transformation and upgrading of traditional manufacturing enterprises and promoting the comprehensive competitiveness in the new international competitive environment.

Changes of world's political, economic and social environments make the demand of digital transformation and upgrading of traditional small- and medium-sized enterprises more necessary. This article takes the foreign trade original equipment manufacture (OEM) Qingdao home textile industry as an example to analyze the obstacles in the digital construction of the industry and points out the lack of advanced management technology is the key obstacle to the success of digital transformation and upgrading for the enterprise. Suggestions such as making up the shortcomings of management technology, cultivating advanced management technology, promoting basic disciplines and serving the society are proposed for the development of small- and medium-sized enterprises, especially OEM home textile enterprises.