石油天然气长输管道路由选线规划标准与原则探讨

路由选线规划是油气管道建设的首道程序,选线规划的合理与否直接决定了管道本身的设计和建设难度,并会对管道沿线的生态环境、城市发展等问题造成一定影响。针对长距离油气输送管道路由选线规划中涉及的各项法律法规和标准规范,从安全距离、环境保护、相关规划、管理要求等方面阐述了管道选线的基本要求。指出公共安全、生态安全优先,管道廊道统筹、土地资源集约利用,技术合理、经济可行是选线规划时应当遵循的3个重要原则。探讨了遥感、地理信息系统等新型技术在管道选线中应用的可行性,以及油气长输管道选线原则的适用范围。

电话拨号器的性能与规范探讨

本文对电话拨号器的性能、种类进行了阐述,并对其当前的市场和各运营商的使用情况进行了分析,然后对其规范和要求进行了探讨。最后分析了目前在电话拨号器使用中的争议点,并对此提出一些建议。

西二线枣阳—十堰支干线线路工程设计要点

枣阳—十堰支干线经过湖北省8个县市区,沿途地形复杂多变、地质情况复杂,地质灾害发育,环境敏感点和地方规划众多,设计难度和施工难度极大,文章针对路由选线、管材选择、敷设方式、地质灾害处理、水工保护等方面进行了总结,并论述了管线与地方规划的关系。

POWER CONTROL BASED COOPERATIVE OPPORTUNISTIC ROUTING IN WIRELESS SENSOR NETWORKS

This paper proposes an approach called PC-CORP (Power Control based Cooperative Opportunistic Routing Protocol) for WSN (Wireless Sensor Networks), providing robustness to the random variations in network connectivity while ensuring better data forwarding efficiency in an energy efficient manner. Based on the realistic radio model, we combine the region-based routing, rendezvous scheme, sleep discipline and cooperative communication together to model data forwarding by cross layer design in WSN. At the same time, a lightweight transmission power control algorithm called PC-AIMD (Power Control Additive Increase Multiplicative Decrease) is introduced to utilize the co- operation of relay nodes to improve the forwarding efficiency performance and increase the robustness of the routing protocol. In the simulation, the performance of PC-COPR is investigated in terms of the adaptation of variations in network connectivity and satisfying the QoS requirements of application.

On Channel Assignment for Multicast in Multi-Radio Multi-Channel Wireless Mesh Networks:A Survey

The major challenge faced by wireless mesh networks is the capacity reduction caused by interference,and interference can be reduced or even eliminated through appropriate channel assignment.This article presents a comprehensive survey of channel assignment schemes for multicast in multi-radio multi-channel wireless mesh networks.We analyze the state-of-the-art channel assignment schemes for multicast and provide comprehensive taxonomy of the latest work.In general,we classify the channel assignment schemes for multicast into two types,that is,sequential multicast routing and channel assignment(SMRCA)and joint multicast routing and channel assignment(JMRCA).Detailed review of channel assignment schemes in each category is provided.Possible future research directions and corresponding solutions are also explored to motivate research interests in the field of channel assignment for multicast in wireless mesh networks.

长距离输送油气管道选线条件探究

油气是我国经济的发展命脉,在我国经济的发展中占有是非重要的作用。油气管道是油气正常输送的有力保证。油气管道的选线是油气管道的建设的第一道程序,油气管道选线的合理与否,直接决定了油气管道的设计和未来的建设。与此同时,还会对周边的环境,城市产生一定的影响。本文从长距离输送油气管道的选线合理规划,以及对环境保护、选线的合理距离等方面进行阐述,探讨了长距离输送油气管道的选线的统筹性、以及选线的原则和使用范畴。

海底管道规范标准进展探析

针对海底管道建设及运维过程中的技术要求问题,对挪威DNV、美国API、ABS、ASME、英国、澳大利亚及中国等地区的海底管道相关技术规范标准进行汇总梳理,总结了各规范关于路由选线、设计埋深、安全评估等方面的技术准则及差异性。提出了东海海域设计埋深的问题。可供国内海底管道相关建设运维单位参考。