[目的]旨在探讨面向碳中和背景下直接空气捕碳(Direct Air Capture,DAC)技术的发展现状、应用案例及其经济性评估,以期为我国实现碳减排目标提供参考。[方法]文章综述了DAC技术的工作原理、类型、运用案例,并分析了其在国内外的发展情...[目的]旨在探讨面向碳中和背景下直接空气捕碳(Direct Air Capture,DAC)技术的发展现状、应用案例及其经济性评估,以期为我国实现碳减排目标提供参考。[方法]文章综述了DAC技术的工作原理、类型、运用案例,并分析了其在国内外的发展情况。通过比较不同研究中的成本数据,评估了DAC技术的经济性,并讨论了当前面临的挑战与可能的解决措施。[结果]研究发现,DAC技术能有效从空气中捕集CO_(2),具有布置灵活、可与可再生能源结合等优点。但其商业化应用仍受到高成本、高能耗和大规模部署的技术挑战的限制。国内外的案例分析揭示DAC技术在实际应用中的效率和成本问题亟待解决,同时也显示了通过技术改进和政策支持可能实现的优化潜力。[结论]尽管存在挑战,DAC技术仍是实现碳中和目标的潜在储备技术,尤其对中国等面临严峻碳减排压力的国家具有重要意义。需要集中研究力量开发更高效、低成本的吸收/吸附剂,改进系统设计,降低能源消耗,并积极探索与可再生能源的结合使用。政府的政策支持和社会的广泛认可也是实现DAC技术商业化的关键因素。通过这些措施可以推动DAC技术的发展和应用,助力实现碳减排和环境保护的双重目标。展开更多
Direct air capture(DAC)is a negative carbon emission technology that faces challenges in scalability and practical deployment due to its exorbitant costs.Hou et al.(2017)integrated DAC technology with fertilization.A ...Direct air capture(DAC)is a negative carbon emission technology that faces challenges in scalability and practical deployment due to its exorbitant costs.Hou et al.(2017)integrated DAC technology with fertilization.A multi-bed desorption system driven by water provides a competitive and sustainable carbon source for indoor agriculture.展开更多
Access Control(AC)is one of the important technologies of System Security and has been widely studied recently because the traditionary AC technologies can' t meet with the security commands of contemporary imform...Access Control(AC)is one of the important technologies of System Security and has been widely studied recently because the traditionary AC technologies can' t meet with the security commands of contemporary imformation system. As a result,the traditionary AC technologies have been developed and some new technologies have been put forward. This paper makes the necessary classification for the more-than-ten-year research results of the AC technology,together with the analysis and predication for the development trend of the AC technology in the future.展开更多
Over time, the world has transformed digitally and there is total dependence on the internet. Many more gadgets are continuously interconnected in the internet ecosystem. This fact has made the Internet a global infor...Over time, the world has transformed digitally and there is total dependence on the internet. Many more gadgets are continuously interconnected in the internet ecosystem. This fact has made the Internet a global information source for every being. Despite all this, attacker knowledge by cybercriminals has advanced and resulted in different attack methodologies on the internet and its data stores. This paper will discuss the origin and significance of Denial of Service (DoS) and Distributed Denial of Service (DDoS). These kinds of attacks remain the most effective methods used by the bad guys to cause substantial damage in terms of operational, reputational, and financial damage to organizations globally. These kinds of attacks have hindered network performance and availability. The victim’s network is flooded with massive illegal traffic hence, denying genuine traffic from passing through for authorized users. The paper will explore detection mechanisms, and mitigation techniques for this network threat.展开更多
文摘[目的]旨在探讨面向碳中和背景下直接空气捕碳(Direct Air Capture,DAC)技术的发展现状、应用案例及其经济性评估,以期为我国实现碳减排目标提供参考。[方法]文章综述了DAC技术的工作原理、类型、运用案例,并分析了其在国内外的发展情况。通过比较不同研究中的成本数据,评估了DAC技术的经济性,并讨论了当前面临的挑战与可能的解决措施。[结果]研究发现,DAC技术能有效从空气中捕集CO_(2),具有布置灵活、可与可再生能源结合等优点。但其商业化应用仍受到高成本、高能耗和大规模部署的技术挑战的限制。国内外的案例分析揭示DAC技术在实际应用中的效率和成本问题亟待解决,同时也显示了通过技术改进和政策支持可能实现的优化潜力。[结论]尽管存在挑战,DAC技术仍是实现碳中和目标的潜在储备技术,尤其对中国等面临严峻碳减排压力的国家具有重要意义。需要集中研究力量开发更高效、低成本的吸收/吸附剂,改进系统设计,降低能源消耗,并积极探索与可再生能源的结合使用。政府的政策支持和社会的广泛认可也是实现DAC技术商业化的关键因素。通过这些措施可以推动DAC技术的发展和应用,助力实现碳减排和环境保护的双重目标。
基金supported by the National Natural Science Foundation of China(No.52276022).
文摘Direct air capture(DAC)is a negative carbon emission technology that faces challenges in scalability and practical deployment due to its exorbitant costs.Hou et al.(2017)integrated DAC technology with fertilization.A multi-bed desorption system driven by water provides a competitive and sustainable carbon source for indoor agriculture.
文摘Access Control(AC)is one of the important technologies of System Security and has been widely studied recently because the traditionary AC technologies can' t meet with the security commands of contemporary imformation system. As a result,the traditionary AC technologies have been developed and some new technologies have been put forward. This paper makes the necessary classification for the more-than-ten-year research results of the AC technology,together with the analysis and predication for the development trend of the AC technology in the future.
文摘Over time, the world has transformed digitally and there is total dependence on the internet. Many more gadgets are continuously interconnected in the internet ecosystem. This fact has made the Internet a global information source for every being. Despite all this, attacker knowledge by cybercriminals has advanced and resulted in different attack methodologies on the internet and its data stores. This paper will discuss the origin and significance of Denial of Service (DoS) and Distributed Denial of Service (DDoS). These kinds of attacks remain the most effective methods used by the bad guys to cause substantial damage in terms of operational, reputational, and financial damage to organizations globally. These kinds of attacks have hindered network performance and availability. The victim’s network is flooded with massive illegal traffic hence, denying genuine traffic from passing through for authorized users. The paper will explore detection mechanisms, and mitigation techniques for this network threat.
