A Race for Marine Space: Science,Values, and Aquaculture Planning in New Zealand

New Zealand (NZ) has developed a coastal management framework that includes large watersheds and territorial waters (out to 12 nautical miles). The article describes the developing conflicts associated with the biophysical and epistemological dimensions of expanding coastal marine space for aquaculture. We first review aquaculture policy in NZ, and recent evidence of the biophysical impacts from increasing terrestrial inputs on marine ecosystems. We provide a case study of conflict over a recent proposal to expand salmon aquaculture in the Marlborough Sounds, which covers some 4,000 km² of sounds, islands, and peninsulas. Based on information and data from interviews of stakeholders involved in the aquaculture planning, we describe three diverse epistemologies of science—client-based science, civic science, and Māori traditional ecological knowledge. We conclude the article with a critical review of how to better resolve spatial conflicts that often emerge in coastal management and planning.     

全面提升新体制下的管理能力

在新的管理模式下，北京电务段通过深化内部机制整合，合理设置机关科室，做强做实车间，逐步实行值班和检修分开的方式，将新体制下的安全管理工作做到实处，实现了合段后的安全年。     

高速铁路移动通信系统WINNER信道性能分析

在对无线信道模型和铁路电波传播环境研究基础上,提出WINNER D2a信道模型是高速铁路无线信道的合适选择,并建立了高速铁路移动通信系统WINNER D2a信道半实物仿真平台。与传统的计算机仿真相比,半实物仿真平台具有更高的仿真性和实时性,并能在实验室对设备在高速铁路上的性能进行测试。在仿真平台上对不同移动速度、同频干扰、接收电平条件下的高速铁路移动通信系统的性能进行了仿真。分析结果表明:移动速度和同频干扰对系统性能影响非常大,而接收电平则对性能没有明显影响。最后探讨了改善系统性能的技术措施。     

多方合力 加快江苏水运强省步伐

在工程建设过程中,常常涉及到高程测量。本文结合工程实际,简要阐述新三角高程测量法。     

在生物课堂教学中渗透课改新理念

课改新理念是在旧理念基础上的推陈出新。如何在生物课堂教学中渗透课改新理念,上一堂好课,需要教师具备正确的教学观,能促进学生的全面发展,将课堂教学诸要素进行有机统一,体现学生的主体性、教学生成性和学习方式的协作性,遵循教学的客观规律。     

扩大长江干线航道通过能力研究

城区段河道规划是关系到城市人民财产、生命安全的重要方面,更是提升城市品位,提高人民生活质量的根本。本文就整体规划方案分析,使水利工程向“美、靓、实”的方向规划,供大家共同探讨。     

浅析新会计准则对航运企业的影响

新会计准则将对上市公司业绩及资产价值产生重大影响。本文试从航运企业自身的经营特点,分析执行新会计准则将会对航运企业产生的主要影响。     

西部陆海新通道货运量预测研究

西部陆海新通道在区域协调发展格局中具有战略地位,对我国深化陆海双向开放、推进西部大开发形成新格局等具有重要意义.在分析西部陆海新通道总体规划及铁路网规划的基础上,结合西部陆海新通道功能定位,分析货运量影响因素,从区域间货运量、对外贸易货运量、分流沿江通道货运量3个方面进行运量预测.针对每部分货运量,在分析历年货运量的基...     

新疆对接“一带一路”修建宽轨铁路可行性研究

阿拉山口站是新欧亚大陆桥通道的重要国际换装站,是我国向西开放的主要对外接口。在"一带一路"倡议的推动下,以促进丝绸之路经济带核心区建设,加快与周边国家互联互通为契机,开展研究宽轨铁路引进新疆的可行性。首先,在分析通道现状存在问题的基础上,对新形势下阿拉山口口岸过货量、中欧班列、对外贸易发展、产业布局等需求分析,探讨由阿拉山口口岸引入宽轨铁路后既有通道的替代性、跨境运输的配套措施、作业时间及费用、功能布置、运营保障性等作业的发展对策。根据项目所在区域内工程条件、环境、地质及产业布局发展规划,推荐宽轨铁路一期引入精河、二期引入乌鲁木齐的站位方案,形成宽轨铁路引入新疆的在技术上可行及必要的研究结论。     

A New Technique of High-performance and Fast Tensioning Prestressed Anchorage CableEI北大核心

Research purposes: The large-span transition section tunnel of the Badaling Great Wall station on the Beijing-Zhangjiakou high-speed railway with the maximum excavation width of 32.7 m, and the largest excavation area of 494.4 m 2 , is the world's biggest traffic tunnel in the world with the largest excavation width and excavation area, which has difficult construction and high security risks. The initial support system of tunnel is mainly realized by prestressed bolt, prestressed cable and shotcrete. After test, anchor cable tension using the traditional anchor cable construction technology can't meet the design requirements, at the same time, it takes about 30 days to achieve prestressed tensioning. Therefore, we need to study the high-performance fast tensioning prestressed anchor cable technology, to effectively control surrounding rock deformation, to ensure the safety of construction, improve construction efficiency. Research conclusions:(1) The traditional anchor cable construction technology is adopted. The anchor cable tension value is mainly controlled by the grip force between the anchor rope and grouting body and the cohesive force between grouting body and surrounding rock. (2) The grip force between the anchor rope and the grouting body can be increased by about 2 times by increasing the "barb"; The cohesive force between the grouting body and the surrounding rock can be increased by 1.5 times by 6 ~ 7 MPa high-pressure grouting process. (3) The modified sulphoaluminate cement slurry can reach more than 30 MPa within 1 day of the slurry strength, so as to realize fast anchor cable tension within 1 day after grouting completion. (4)The research results can be used for reference in similar prestressed anchorage cable construction projects. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.