From the Far Side of the Moon: Delay/DisruptionTolerant Networking Communications via Lunar Satellites

Delay/Disruption-Tolerant Networking(DTN) originated from research on Interplanetary Internet and still today space applications are the most important application field and research stimulus. This paper investigates DTN communications between the Earth and the far side of the Moon, by means of a lunar orbiter acting as relay. After an introductory part, the paper presents a comprehensive analysis of the DTN performance that can be achieved on the identified communication scenario. The focus is on the evaluation of the stateof-the-art ability of Interplanetary Overlay Network(ION), the NASA DTN implementation of Bundle Protocol(BP) and Contact Graph Routing(CGR), to meet the many challenges of the space communication scenario investigated(and more generally of a future interplaynetary Internet): intermittent links, network partitioning, scarce bandwidth, long delays, dynamic routing, handling of high priority and emergency traffic, interoperability issues. A study of security threats and Bundle Security Protocol(BSP) countermeasures complete the work.The many results provided, confirm the essential role of DTN in future space communications.

A new type of facility to assist ship safely though the Rapids Rubber Dam

Rapids and shoals in the channel have a huge impact on the safety of the ship navigation, Based on the principle of a rubber dam can always adjust the height of the dam and raise upstream water level, This thesis creatively proposed the principle which applied to rapids and shoals in the Channel. In order to achieve the purpose of assisting ship through the channel safely. In this paper, through theoretical calculations verified the rubber dam has characteristics of raising water level, increasing the depth of the shoals, reducing the flow velocity, reducing water surface slope and improving the conditions of navigation. Therefore, this study has a wide range of practical value and application prospects in the project

The planning and comprehensive utilization of Three Gorges Project

As the most significant water project,the Three Gorges Project (TGP) was designed to take care of multiple objectives for water utilization such as flood control,power generation and navigation.The implementation of the project improved the flood safety level of Jingjiang reach to more than 100-year return period,which reduced greatly the flood risk at the mid-lower reaches of Changjiang River,produce huge quantity of energy for the central,east and south China,and improved significantly the navigation conditions of Chuanjiang River.Meanwhile,the operation of the TGP in dry season which compensate the downstream water resources,will as well deepen the navigation channel and thus improve the navigation conditions in the middle river reach.With the increasing demands raised from various aspects of the society,new requirements will be made for the TGP for the purpose of harnessing,development and protection of the Yangtze River Basin.Therefore,it will be a long-term task for the operation of TGP on how to optimize the water resources utilization and implement an effective operation.

水利部交通运输部加强合作联手打击长江非法采砂

为保障长江防洪和通航安全,近日,水利部办公厅、交通运输部办公厅联合印发通知,发布《长江河道采砂管理合作机制2014年度工作要点》,提出要进一步深化长江河道采砂管理两部合作,加大对长江河道非法采砂打击力度。通知要求,进一步落实长江河道采砂管理责任制,逐级逐江段落实本行政区域内长江干流河道采砂管理地方人民政府行政首长责任人、水行政主管部门责任人和现场监管责任人,建立责任追究制度,并在媒体上公告全江责任人名单。通知强调,强化现场监管和河道日常巡查,各地要制定许可采区现场监管办法,建立河道采砂日常巡查制度。