In 1994, the handling capacity and business volume of China’s posts and telecommunications fulfilled the target of the Eighth Five-Year Plan (1991-1995) a year ahead of schedule and that of quadrupling the business v...In 1994, the handling capacity and business volume of China’s posts and telecommunications fulfilled the target of the Eighth Five-Year Plan (1991-1995) a year ahead of schedule and that of quadrupling the business volume during the period of 1980-2000 six years in advance. 1. The comprehensive communications capacity further enhanced with the construction of the telecommunication mains transmission network mainly composed of optical fibre cables is now in place. Seven展开更多
Orbits that are frozen in an averaged model,including the effect of a disturbing body laying on the equatorial plane of the primary body and the influence of the oblateness of the primary body,have been applied to pro...Orbits that are frozen in an averaged model,including the effect of a disturbing body laying on the equatorial plane of the primary body and the influence of the oblateness of the primary body,have been applied to probes orbiting the Moon.In this scenario,the main disturbing body is represented by the Earth,which is characterized by a certain obliquity with respect to the equatorial plane of the Moon.As a consequence of this,and of the perturbing effects that are not included in the averaged model,such solutions are not perfectly frozen.However,the orbit eccentricity,inclination,and argument of pericenter present limited variations and can be set to guarantee the fulfillment of requirements useful for lunar telecommunication missions and navigation services.Taking advantage of this,a practical case of a Moon-based mission was investigated to propose useful solutions for potential near-future applications.展开更多
Web Services技术是建立在开放的Internet基础上的新的分布式计算模型,代表了下一代网络计算和企业应用的必然趋势。本文针对惠州学院成人教育教学管理的实际情况,提出了基于Web Services技术成人教学管理系统的应用模型,并具体论述了...Web Services技术是建立在开放的Internet基础上的新的分布式计算模型,代表了下一代网络计算和企业应用的必然趋势。本文针对惠州学院成人教育教学管理的实际情况,提出了基于Web Services技术成人教学管理系统的应用模型,并具体论述了系统的总体设计、功能结构设计及其实现。展开更多
文摘In 1994, the handling capacity and business volume of China’s posts and telecommunications fulfilled the target of the Eighth Five-Year Plan (1991-1995) a year ahead of schedule and that of quadrupling the business volume during the period of 1980-2000 six years in advance. 1. The comprehensive communications capacity further enhanced with the construction of the telecommunication mains transmission network mainly composed of optical fibre cables is now in place. Seven
基金M.Cinelli was supported by the G4S_2.0 project,developed under the auspices of the Italian Space Agency(ASI)within the framework of the Bando Premiale CICOT-2018-085the co-participation of the Italian Institute for Astrophysics(INAF)and the Politecnico di Torino(POLITO).
文摘Orbits that are frozen in an averaged model,including the effect of a disturbing body laying on the equatorial plane of the primary body and the influence of the oblateness of the primary body,have been applied to probes orbiting the Moon.In this scenario,the main disturbing body is represented by the Earth,which is characterized by a certain obliquity with respect to the equatorial plane of the Moon.As a consequence of this,and of the perturbing effects that are not included in the averaged model,such solutions are not perfectly frozen.However,the orbit eccentricity,inclination,and argument of pericenter present limited variations and can be set to guarantee the fulfillment of requirements useful for lunar telecommunication missions and navigation services.Taking advantage of this,a practical case of a Moon-based mission was investigated to propose useful solutions for potential near-future applications.
