Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-05-08 Cooperative journals: 《中国科学院院刊》
Abstract: In the context of the new round of scientific and technological revolution and industrial transformation, the related issues of techno-economic security have become the focus of major countries and regions. From the perspective of discipline construction, basic theory has been studied on key questions such as why, what, and how to evaluate. This study analyzes the importance and urgency, puts forward key issues of techno-economic security that should be paid attention to at different levels, such as technology, enterprise, industry, and country or region. A mechanism framework of the occurrence and evolution of techno-economic security is constructed, which is composed of four nodes: environmental induction, factor transmission, multiple feedback, and spatio-temporal evolution. On this basis, the TMAPS (technology-marketactors- policy-security) model and index framework of techno-economic security evaluation are formed. The study is helpful to further clarify the connotation and boundary of techno-economic security, and provide theoretical and methodological support for strengthening the evaluation of techno-economic security and guaranteeing the level of techno-economic security.
Subjects: Geosciences >> Space Physics submitted time 2017-01-22
Abstract: Combining the GRO (Global Navigation Satellite System Radio Occultation GRO) and LRO (Low Earth Orbit Radio Occultation) techniques to probe the Earth's atmosphere is a main development direction of RO. In this study, the mathematical criteria of a RO event have been described. Then the effects of the main orbit parameters of LEO satellite on the RO events amount and their global distribution have discussed by a simulation study. The results showed that the lower the LEO satellite orbit is, the more GRO events are; when the inclination is between 30癮nd 75� there are more GRO events and their Earth coverage is higher. The LRO events distribute on the Earth evenly when the LEO-LEO RO satellite set in the polar orbits. This study can provide a scientific reference for GRO and LRO satellite constellation design.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics Subjects: Geosciences >> Marine Sciences submitted time 2016-05-13
Abstract:全球卫星导航定位系统的反射信号(GNSS-R)遥感是反演陆地和海洋表面地球物理参数的有力工具.而机载GNSS-R是一个很重要的实验平台,因为它不仅可以为空基实验提供校准依据,而且在中小尺度目标(比如河流和湖泊)的遥感方面独具优势.机载实验的研究主要包括海面风场的反演、海面高度的测量和土壤湿度的探测.首次反演海面风场和土壤湿度的机载GNSS-R实验都是由美国NASA和科罗拉多州立大学组织实施的.之后在西班牙IEEC(Institut d'Estudis Espacials de Catalunya)/CSIC(Consejo Superior de Investigaciones Cientificas)、Starlab实验室与NASA的联合实验中,海面风场的反演精度已经能够达到2 m/s.两个最早利用GNSS-R探测海面高度的机载GNSS-R实验都是美国的JPL(Jet Propulsion Laboratory)组织实施的,其中海面平均高度的探测精度已经达到了厘米级.在中国,北京航空航天大学和中国科学院遥感与数字地球研究所也组织了相应的机载GNSS-R实验.
Peer Review Status:Awaiting Review