No abstract

Innovation strategies for the promotion of solid waste recycling technologies include not only new technologies for resource utilization of solid waste but also sustainable business models to support the adoption of these technologies. This study presents how to incorporate the determinant factors affecting technology promotion and business strategy into a sustainable business model for the promotion of solid waste recycling technologies. A systematic literature review summarizes the determinant factors affecting the aforementioned promotion, including market-, policy-, company-, and technology-related factors. Combined with the theoretical background of the sustainable business model, this study analyzes that for the promotion of solid waste recycling technologies from value dimensions (value proposition, value creation & delivery, and value capture) and sustainability dimensions (economic, social, and environmental). We confirm the importance of incorporating determinant factors into the sustainable business model from the analysis of the Daye Non-Ferrous Metal Recycling Park. Our case study proposes that innovation of the sustainable business model needs to drive changes in business strategy. To promote the aforementioned technologies, we propose an Internet-based technology service platform as the core strategy of the sustainable business model. As the private sector, technology companies can make full use of technological innovation, public policies, and the market environment to achieve and develop sustained competitive advantages through an Internet-based platform and to effectively enhance the promotion of solid waste recycling technologies and help achieve sustainable development.

The demand together with the urgency of phosphogypsum (PG) treatment, will pose big challenges for many countries. This research aims to explore the research progress of PG, including basic status, cooperation situation, research elds and development trends, based on Web of Science database through bibliometric analysis of publications (articles and patents) from 1990 to 2020. The results show that the academic research of PG originated earlier, but the number of patents grew faster. China has an absolute advantage in the numbers and plays a signi cant role in international cooperation. The knowledge structure of PG is mainly concentrated in the elds of natural radioactivity, cement paste back lling, soil, crystal morphology, and synthetic gas. Academic hotspots focus on the microstructure of chemical processes and various environmental impacts, and the patents hot technologies is the production of refractory materials, ceramics, surface materials, cement mortar and composite materials. The academic frontiers of PG will be the methods of recovering rare earth elements from PG, the conditions of ion solidi cation/stabilization in PG, the impact of reaction conditions on product quality, and the reaction mechanism at the micro-level. The frontiers of patents will focus on the improvement of manufacturing equipment, new wall materials and chemical modi ed polymer materials. In terms of the number of articles and patents in the future, architectural research has the maximum space for improvement. This paper conducts an in-depth analysis of PG and provides information on the technological development prospects and opportunities, which is helpful for researchers engaged in PG management.

The construction of ecological barriers and ecological security patterns is an important way of maintaining regional ecological security in landscape ecology. However, there is still no consensus on the concept and connotation of ecological barriers, and the zoning and adaptive management of ecological sources are rarely considered in the construction of ecological security patterns. This study uses the terrestrial ecosystem of Bohai Bay, China as a study area, and the identification and zoning of ecological sources in the ecological security pattern are achieved by combining an ecosystem service assessment with an ecological risk assessment, and on this basis, ecological barriers are identified to optimize the structure and function of ecological sources. The minimum cumulative resistance model is used to identify ecological corridors and ecological strategic nodes and to construct an ecological security pattern based on the modified ecological sources. The results demonstrate that firstly, 2873.25 km2 was identified as the ecological source, accounting for 14.28% of the total. Secondly, there are three large ecological barrier zones and nine ecological barrier cells with a total area of 1173.06 km2, accounting for 40.83% of the ecological sources. Thirdly, a total of 35 ecological corridors were extracted, and 32 ecological strategic nodes were marked, mainly distributed at the intersection and branches of important ecological corridors. An ecological security pattern construction system was formed with the collection of ecological source selection, ecological barrier identification, ecological resistance surface construction, and ecological corridor extraction. Fourthly, the concept and connotation of ecological barriers was analyzed, and the complementary relationship between ecological barriers and ecological security patterns in terms of structure and function is discussed. This study enriches the definition and connotation of ecological barriers, provides a new framework for identifying the ecological security patterns, and provides scientific guidance for ecological protection and management in coastal areas.

The demand together with the urgency of phosphogypsum (PG) treatment, will pose big challenges for many countries. This research aims to explore the research progress of PG, including basic status, cooperation situation, research fields and development trends, based on Web of Science database through bibliometric analysis of publications (articles and patents) from 1990 to 2020. The results show that the academic research of PG originated earlier, but the number of patents grew faster. China has an absolute advantage in the numbers and plays a significant role in international cooperation. The knowledge structure of PG is mainly concentrated in the fields of natural radioactivity, cement paste backfilling, soil, crystal morphology, and synthetic gas. Academic hotspots focus on the microstructure of chemical processes and various environmental impacts, and the patents hot technologies is the production of refractory materials, ceramics, surface materials, cement mortar and composite materials. The academic frontiers of PG will be the methods of recovering rare earth elements from PG, the conditions of ion solidification/stabilization in PG, the impact of reaction conditions on product quality, and the reaction mechanism at the micro-level. The frontiers of patents will focus on the improvement of manufacturing equipment, new wall materials and chemical modified polymer materials. In terms of the number of articles and patents in the future, architectural research has the maximum space for improvement. This paper conducts an in-depth analysis of PG and provides information on the technological development prospects and opportunities, which is helpful for researchers engaged in PG management.