The key technologies are of great importance to our country, which are of great significance to promote the highquality development of China's economy and safeguard national security. Although it has made brilliant achievements in science and technology development, there are still some problems at present, such as scattered but not refined about the scientific and technological research, extensive but not deeply on the scientific and technological innovations, many but not strongly of the scientific research subjects, stable but not active of the basic research, and fragmentary but not practical of the scientific and technological achievements. In view of the problems above, based on the theory of "On Contradiction" and "On Practice", this paper analyzes the principal contradiction in the construction of the key technology innovation system, and puts forward the management mode of scientific innovation-technological innovation-engineering innovation. And, it also puts forward some suggestions on the construction of the key technology innovation system from the aspects of top-level design, evaluation system, supervision method and credit record, in order to provide reference for the construction of the key technology innovation system.

This paper systematically reviews the literature related to governance modernization of scientific and technological innovations. Starting from governance theory and connotation of modernization, the paper analyzes the connotation of modernization era of scientific and technological innovation governance. Combined with the evolution of China's science and technology innovation system reform and the development strategy of science and technology self-reliance and self-improvement of the Fifth Plenary Session of the 19th CPC Central Committee, this paper puts forward the future key tasks for modernization of science and technology innovation governance from six aspects:tackling strategic science and technology, adhering to the concept of self-confidence, cultivating innovation culture, improving innovation efficiency, enhancing international influence, and building a talent highland. Finally, it analyzes the key points of governance modernization of science and technology innovation in terms of strengthening the top-level design of governance system, creating a good science and technology innovation ecology, improving the construction of science and technology innovation by law, advocating responsible innovation, and adhering to people-oriented.

Planning and construction of North Metropolis is not only a major adjustment of Hong Kong's development strategy but also a landmark event in the construction of Guangdong-Hong Kong-Macao Greater Bay Area. Under the framework of the Guangdong-Hong Kong-Macao Greater Bay Area, this paper discusses the background and significance of the construction of Hong Kong Northern Metropolis, analyzes its impacts on the construction of Guangdong-Hong Kong-Macao Greater Bay Area, and deals with the challenges of industrial space, land system, development model, cross-border movement of factors, cooperation mechanism between Guangdong and Hong Kong or between Shenzhen and Hong Kong, and finally puts forward policy suggestions to promote the construction at the three levels:the country, the bay area, and Hong Kong.

To be a unique carbon sink, agriculture as the first industry has double performance to reduce carbon emission and to absorb as well as resolve carbon. It thus exists as an important pillar for realizing national target of carbon neutrality. The socalled agro-forestry engineering for carbon neutrality refers to a comprehensive engineering that considerably increases the capacity of carbon emission reduction and carbon reservation through science-guided plantation on three kinds of land, i.e., arable land, forest land, and marginal land which is not suitable for crop cultivation but can be planted with dedicated energy bushes and grasses for their strong resilience. The size of such three carbon neutral grounds totals 465 million hectares, or 135 million, 186 million and 144 million hectares, respectively. The potential capability for adding carbon sink and biomassconverted energy are respectively 3.74 billion tons and 1.21 billion tce annually. The agro-forestry engineering simultaneously comprises environment protection, energy upgrading, agriculture fortification, countryside revitalization and benefiting peasants, thus it is regarded as a national treasure.

Fossil energy is the prime culprit for huge GHGs emission, covering almost 90 percent of the total amount. There has been a great deal of discussion about reducing GHGs in China, however, the biomass energy which is of carbon zero-emission characteristic has not been paid much attention. Furthermore, biomass's unique function of carbon negative emission is far from being recognized. This paper describes the mechanism of biomass's carbon negative emission and its theoretical potentials to China and the world. Several real practical and feasible ways, particularly the way of reducing biomass-derived methane, for carbon negative emission are probed. It is discovered that biomass-derived carbon sequestration is far superior to geological CO₂ storage, and highly feasible as well. The world climate change circle pays much attention to the biomass's function of GHGs emission and to the effects of its unique carbon negative emission in particular. Someone even calls it the last prospect for realizing the global 1.5℃ scenario. The situation of severely ignoring biomass's great effects on GHGs reduction should be shifted as soon as possible.

It is of great significance to study the interaction between air quality and land intensive use and the influencing factors from the point of view of space matching. This paper uses trend surface, spatial autocorrelation, gravity model, spatial dislocation model, grey correlation model and other methods to analyze the spatial differentiation law, spatial matching relationship and driving factors of air quality and land intensive use level in 290 cities across China. The results are as follows 1) In 2017, the air quality in cities across the country showed a central-peripheral structure with the central and southern Hebei urban agglomeration as the core and gradually improved outward, being an obvious agglomeration characteristic; the level of intensive use of urban land across the country presented a multi-core spatial structure with the Beijing-Tianjin-Hebei, Yangtze River Delta, and Pearl River Delta urban agglomerations being the cores, and their agglomeration characteristics were also obvious. 2) The air quality and the level of intensive land use in cities across the country were not spatially coordinated and matched, and the negative dislocation areas were mainly distributed in the Beijing-Tianjin-Hebei and Yangtze River Delta urban agglomerations, and the dislocation intensity presented a core-periphery spatial structure, the positive dislocation areas were distributed in the northeast, southwest, northwest and southern coastal areas, and the dislocation intensity presented a spatial distribution pattern decreasing from southeast to northwest; contributions of spatial dislocation had obvious regional differences, especially in the eastern region(. 3) The overall correlation between the indicators of national urban air quality and land intensive use was strong, in which the concentration of pollutants that affect air quality, the vegetation NDVI that affects the intensive use of land, the greening rate of built-up areas, and the land factors such as the average discharge of industrial wastewater were the main reasons for the spatial dislocation of the two systems.

The European Commission published its European Green Deal by the end of 2019, proposing to take the lead in achieving carbon neutral by 2050. At the same time, the EU put forward seven green action plans and four supporting safeguard measures, as well as a clear emission reduction roadmap for the EU steel industry. This article discusses the background and significance of the Green Deal,and describes the requirements specified for various industries within the EU to achieve carbon neutral. This is then followed by a technical and economic comparison analysis for the technical route adopted in the steel road map. Finally the article deals with the EU's implementation policies and measures to reduce emissions, which may provide important reference for China's future sustainable development of steel industry.

In this article, 1137 literature papers about crisis management in public health emergency are searched based on SCI, SSCI and CSSCI indexes through CNKI and Web of Science databases. This article uses CiteSpace software to visualize the distribution of research hotspots by means of high co-occurrence keywords, burst words, high co-citation literature, major researchers, etc. It also explores the evolution track and development frontier of knowledge clustering such as social media and crisis communication. Results show that effective disposal of public health emergencies needs to enhance the value of big data information system, pay equal attention to data chain and service chain of multi-party communication and cooperation. At the same time, adjustment for compatible management strategy is necessary and scientific guidance of crisis information of internet social media are also needed.

According to the latest researches of tensegrity robot, the characteristics of tensegrity robot are reviewed comprehensively and briefly, and the developments of typical prototypes are summarized. Furthermore, applications of tensegrity robot are introduced from three aspects of ground movement, space exploration and bionic field. On this basis, the key technologies are illustrated concerning initial configuration design, initial prestress analysis and structure stability judgment, morphology determination under external load, dynamic characteristics, and control methods. As last, technical problems of tensegrity robot to be studied in the future are discussed.

As a new Chinese medicine resource, Moringa oleifera Lam. is widely used in botanical medicine. To avoid economic losses caused by blind expanded introduction and cultivation it is urgent to evaluate the spatial distribution of land resources suitable for Moringa oleifera Lam. In this study, 960 global distribution records of Moringa oleifera Lam. are collected to assess the spatial distribution of global environmental suitability of Moringa oleifera Lam. by using spatial information technology and a data-driven model of spatial co-variables of climate, soil, topography and solar radiation. The results show that the land resources suitable for the cultivation of Moringa oleifera Lam. are about 3615.96 million hm² in the world, which are mainly distributed in Southern North America, Eastern and Northern South America, Central Africa, Southeast Asia and Northern Oceania. This study provides a solid foundation for the cultivation partition and promotion program of Moringa oleifera Lam. and helps to alleviate the over-mining of moringa and solve the contradiction between supply and demand of Moringa oleifera Lam.

As the characteristics of military-civilian technology collaborative innovation, such as multi-subject participation, multi-regional distribution, multi-task execution and multi-factor cross-integration, are increasingly evident, how to improve the operational efficiency of innovation network has become an urgent issue to consider. This paper explores the composition and characteristics of the military-civilian technology collaborative innovation network, and combines the response and generation paths required by military application, thereby proposing a military-civilian technology collaborative innovation network system from the perspective of application requirements. On this basis, facing the existing problems in the information push process of "military-to-civilian" and "civilian-to-military" in China, this paper proposes the network information push mechanism of military-civilian technology collaborative innovation from the perspective of application requirements.

Moral foundation theory deemes that human groups have constructed moral virtues, narratives and institutions based on at least five innate psychological foundations:care, fairness, loyalty, authority and sanctity. Moral values are reflected in the degree of endorsement of each moral foundation. In the context of the COVID-19 in China, to examine the changing trend of college students' moral values, the study used a moral foundations questionnaire to survey two groups of Chinese college students before (November 26-December 7, 2017), during (February 29-April 30, 2020) and after the COVID-19 outbreak (July 14-16, 2020). The results show that college students attached more importance to both individual foundations (care and fairness) and collective foundations (loyalty, authority and sanctity) after the COVID-19 outbreak than before. When the epidemic was basically under control, the college students'overall endorsement of individual and collective foundations did not immediately fall or rise significantly. The results suggest that compared with 2017, college students' endorsement of moral foundations had increased significantly after the outbreak of the epidemic; the reasons behind it need to be further explored.