Advancing solar energy conversion materials: fuel the future     

Zhigang Zou 《国家科学评论(英文版)》2021,8(8)

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Extraterrestrial artificial photosynthetic materials for in-situ resource utilization     

Liuqing Yang  Ce Zhang  Xiwen Yu  Yingfang Yao  Zhaosheng Li  Congping Wu  Wei Yao  Zhigang Zou 《国家科学评论(英文版)》2021,8(8)

Aerospace milestones in human history, including returning to the moon and manned Martian missions, have been implemented in recent years. Space exploration has become one of the global common goals, and to ensure the survival and development of human beings in the extraterrestrial extreme environment has been becoming the basic ability and technology of manned space exploration. For the purpose of fulfilling the goal of extraterrestrial survival, researchers in Nanjing University and the China Academy of Space Technology proposed extraterrestrial artificial photosynthesis (EAP) technology. By simulating the natural photosynthesis of green plants on the Earth, EAP converts CO₂/H₂O into fuel and O₂ in an in-situ, accelerated and controllable manner by using waste CO₂ in the confined space of spacecraft, or abundant CO₂ resources in extraterrestrial celestial environments, e.g. Mars. Thus, the material loading of manned spacecraft can be greatly reduced to support affordable and sustainable deep space exploration. In this paper, EAP technology is compared with existing methods of converting CO₂/H₂O into fuel and O₂ in the aerospace field, especially the Sabatier method and Bosch reduction method. The research progress of possible EAP materials for in-situ utilization of extraterrestrial resources are also discussed in depth. Finally, this review lists the challenges that the EAP process may encounter, which need to be focused on for future implementation and application. We expect to deepen the understanding of artificial photosynthetic materials and technologies, and aim to strongly support the development of manned spaceflight.  相似文献   

Y6 and its derivatives: molecular design and physical mechanism     

Qingya Wei  Jun Yuan  Yuanping Yi  Chunfeng Zhang  Yingping Zou 《国家科学评论(英文版)》2021,8(8)

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移动终端上文献管理工具的比较研究     

邹永利  范丽婷傅钰 《新世纪图书馆》2014,(2):43-47

文献管理工具是一种可以有效提高科研工作者学习研究效率的软件,移动终端上的文献管理工具将用户从PC中解脱出来,让用户可以随时随地阅读、管理参考文献.论文选取五款典型的移动终端上的文献管理工具,采用ISO/IEC9126-2000模型,分别从功能性、效率性、易用性、可移植性四个方面进行比较.最后,针对比较结果,指出目前移动终端的文献参考工具具有网络搜索功能薄弱、共享方式少、检索方式单一和书目信息导出方面的功能缺失等不足.  相似文献   

体育院校实验班英语教学的创新研究     

邹瑶 《科教文汇》2014,(10):109-110

本文在基于对体育院校实验班群体特征以及影响该群体英语水平提高因素分析的基础上,主要从教学理念、教学模式、课程设置与教材选择、教学内容与教学手段、评估体系等五个方面阐述体育院校实验班英语教学的创新。  相似文献   

Non-fragile observer-based sliding mode control for a class of uncertain switched systems     

Yonghui Liu  Yugang NiuYuanyuan Zou 《Journal of The Franklin Institute》2014

In this work, the problem of non-fragile sliding mode control is investigated for a class of uncertain switched systems with state unavailable. First, a non-fragile sliding mode observer is constructed to estimate the unmeasured state. And then, a state-estimate-based sliding mode controller is designed, in which a weighted sum approach of the input matrices is utilized to obtain a common sliding surface. It is shown that the reachability of the specified sliding surface can be ensured by the present sliding mode controller. Moreover, the exponential stability of the sliding mode dynamics is analyzed by adopting the average dwell time method. Finally, a numerical simulation is given to demonstrate the effectiveness of the results.  相似文献   

Fabrication of two dimensional polyethylene terephthalate nanofluidic chip using hot embossing and thermal bonding technique     

Zhifu Yin  E Cheng  Helin Zou  Li Chen  Shenbo Xu 《Biomicrofluidics》2014,8(6)

We present in this paper a method for obtaining a low cost and high replication precision 2D (two dimensional) nanofluidic chip with a PET (polyethylene terephthalate) sheet, which uses hot embossing and a thermal bonding technique. The hot embossing process parameters were optimized by both experiments and the finite element method to improve the replication precision of the 2D nanochannels. With the optimized process parameters, 174.67 ± 4.51 nm wide and 179.00 ± 4.00 nm deep nanochannels were successfully replicated into the PET sheet with high replication precision of 98.4%. O₂ plasma treatment was carried out before the bonding process to decrease the dimension loss and improve the bonding strength of the 2D nanofluidic chip. The bonding parameters were optimized by bonding rate of the nanofluidic chip. The experiment results show that the bonding strength of the 2D PET nanofluidic chip is 0.664 MPa, and the total dimension loss of 2D nanochannels is 4.34 ± 7.03 nm and 18.33 ± 9.52 nm, in width and depth, respectively. The fluorescence images demonstrate that there is no blocking or leakage over the entire micro- and nanochannels. With this fabrication technology, low cost polymer nanochannels can be fabricated, which allows for commercial manufacturing of nano-components.  相似文献   

国家情报评估与决策的关系——基于多源流理论和认知心理学双重视角     

王今  马海群  邹纯龙 《图书情报工作》2022,(2):22-31

[目的 /意义]《国家情报评估》被认为是美国情报界最正规和最高水平的战略分析产品.对国家情报评估与决策的关系深入研究,可有助于我国完善科学决策体系,对国家治理体系现代化建设大有裨益.[方法/过程]基于多源流理论和认知心理学,从建议采纳视角出发构建出国家情报评估与决策的影响机制模型,借助模糊集定性比较分析法(fsQCA)...  相似文献   

基于灰色关联法的德约科维奇三种场地制胜因素对比分析     

邹鑫 《体育科技文献通报》2022,(2)

本文旨在探究德约科维奇在三种类型的场地上各技术指标与得失分的关联,运用文献资料法、录像观察法、数理统计法对德约科维奇2010-2021年共280场比赛(硬地140场、红土70场、草地各70场),并运用灰色关联法计算出每种场地各技术指标与得失分的关联度,对关联度大小进行排序并分析三种场地的异同,对我国优秀网球运动员应对不同场地进行针对性训练提供参考和建议。通过研究发现发球速度对于德约科维奇在草地的比赛中贡献度较高,在红土比赛中一发得分率、破发成功率对比赛得失分影响较大,而一发得分率、一发成功率对于硬地比赛得失分有着至关重要的作用。硬地比赛更考验的是球员攻守能力的均衡性,红土场地较强调防守能力和稳定性,而草地比赛更注重球员的进攻能力。  相似文献   

长三角城市群碳排放强度的空间效应及影响因素——基于产业转移视角     

朱泳丽  丁利杰 《资源科学》2022,44(7):1373-1387

长三角城市群协同发展背景下,城市间产业转移频繁,伴随经济和碳排放的连接,对城市碳排放强度产生的影响成为区域低碳发展需要考虑的重要战略问题。本文采用动态偏离-份额模型测度城市间产业转入和转出量。基于空间全局自相关、反距离空间权重和经济地理权重矩阵下的空间杜宾模型,对2005—2017年26个长三角城市的产业转移动态、碳排放强度的时空演变特征进行研究,在空间溢出视角下对城市碳排放强度的影响因素进行分析。结果表明：①碳排放强度存在显著的空间自相关性,具有明显的空间溢出效应。②长三角城市群内频繁转移的产业多数为非能源密集型产业,产业转移并未产生显著“碳减排”效应。值得注意的是,产业转移的经济影响开始显现,产业转移实际上不利于长三角城市群整体碳排放量减少。③人均GDP与碳排放强度呈现“倒U型”,技术水平与碳排放强度呈现“U型”,存在“技术进步的反弹效应”,人口数的增加降低了碳排放强度,二产比重正向作用于碳排放强度。因此在制订碳减排计划时,需要考虑不同区域生产效率、能耗强度、人力资本等因素,做好产业转入、转出的碳排放强度监测,避免盲目进行产业转移;壮大优势产业,改善产业结构,培育新增长点,发展符合城市自身禀赋的低能耗产业。  相似文献