In astronautics, the Hohmann transfer orbit is an orbital maneuver used to transfer a spacecraft between two orbits of different altitudes around a central body. For example, a Hohmann transfer could be used to raise a satellite's orbit from low Earth orbit to geostationary orbit. In the idealized case, the initial and target orbits are both circular and coplanar. The maneuver is accomplished by placing the cr…
网页At present, the life encyclopedia has integrated more than 30000 species encyclopedic data, covering animals, plants and fungi. The main references include: Zoology of China, …
网页The International Research Center of Big Data for Sustainable Development Goals (CBAS) aims to harnesses Big Earth Data to serve the UN 2030 Agenda for Sustainable …
网页2020年10月24日 · The Chinese Academy of Sciences (CAS) Earth System Model version 2 (CAS-ESM 2) has been developed to simulate both the physical climate system and the …