科学家发现红海正在裂变

美国、英国、埃塞俄比亚等多国科学家目前透露,位于非洲东北部与阿拉伯半岛之间的红海正在发生分裂,数百万年之后可能将产生一个新的海洋,而非洲大陆也将分成两部分.这个研究成果证实了目前普遍认同的大陆板块构造学说.     

青春无悔——记中远集团十大杰出青年杨成才

杨成才，从大学毕业分配至中波轮船股份公司，仅用短短7年时间就成长为中波公司最年轻的优秀轮机长。扎实深厚的理论功底，刻苦钻研的探索精神，踏实肯干的工作作风以及对远洋运输事业的热爱与执着，是他快速脱颖而出的源泉。他曾先后荣获全国交通系统青年岗位能手，中央企业知识型先进职工，第三届中远集团十大杰出青年等荣誉称号。     

军工科技档案保密工作存在问题及对策

军工科技档案是武器装备研制单位在从事军工科技活动中形成的原始记录,是重要的国家和国防科技财富,是军队列装技术和国防储备技术的重要信息源.做好军工科技档案保密工作事关党和国家的根本利益,事关军队的安危,事关军工科技事业发展的全局,我们一定要从政治和战略的高度,充分认识此项工作的极端重要性.     

见证历史一刻记中远海运巴拿马轮成功首航巴拿马运河新船闸

中国货轮首航开启百年运河新篇章 当地时间6月26日清晨,来自世界各地观看首航船舶欢迎仪式盛况的人群陆续抵达巴拿马运河大西洋一侧的阿瓜克拉拉(AGUA CLARA)新建船闸边.数千名当地民众在鼓乐声中载歌载舞,手挥巴拿马国旗,热切期待着首航船的到来,共同见证百年运河揭开历史新篇章.     

基于模拟减少集装箱船待港时间的实用方法(英文)

The main challenge for container ports is the planning required for berthing container ships while docked in port.Growth of containerization is creating problems for ports and container terminals as they reach their capacity limits of various resources which increasingly leads to traffic and port congestion.Good planning and management of container terminal operations reduces waiting time for liner ships.Reducing the waiting time improves the terminal’s productivity and decreases the port difficulties.Two important keys to reducing waiting time with berth allocation are determining suitable access channel depths and increasing the number of berths which in this paper are studied and analyzed as practical solutions.Simulation based analysis is the only way to understand how various resources interact with each other and how they are affected in the berthing time of ships.We used the Enterprise Dynamics software to produce simulation models due to the complexity and nature of the problems.We further present case study for berth allocation simulation of the biggest container terminal in Iran and the optimum access channel depth and the number of berths are obtained from simulation results.The results show a significant reduction in the waiting time for container ships and can be useful for major functions in operations and development of container ship terminals.     

中国建筑业技术创新存在的问题与对策

我国建筑行业的技术发展经历了探索阶段、推广阶段和成熟阶段,然而,与国际先进技术相比,我国建筑业技术创新仍存在着许多问题,造成这些问题的原因是多方面的,我国建筑业只有采取各种有效措施,不断加强技术创新,才能增强自身的竞争力.     

可转向电动平车搬运技术开发与应用

重力式码头工程的预制构件一般重量较大,在批量大、规格多的情况下,选择何种搬运工艺,涉及场地布置、设备选用、施工操作人员的劳动强度、搬运效率和经济合理等一系列问题.采用2台轨道电动平车组合搬运3000~5000kN方块的工艺,为重力式码头的构件搬运开辟了新的途径,在港口水工建筑施工中具有广阔的应用前景.     

浅析国防科技工业知识产权运用与产业化

在建设创新型国家和创新型国防科技工业的背景下,推进知识产权运用并实现产业化意义尤为重要.近两年来,随着国防科技工业专利申请、授权量迅猛增长,知识产权尤其是专利运用与产业化工作更显迫切.围绕推进知识产权运用与产业化的意义,结合我国国防科技工业的特点,从多个角度对制约知识产权运用及产业化的制约因素进行分析、阐述,在此基础上,提出可促进国防领域知识产权运用与产业化的建议对策,旨在推动我国国防领域知识产权技术的实施及产业化.     

Analytical and experimental study of free vibration of beams carrying multiple masses and springs

The structures in engineering can be simplified intoelastic beams with concentrated masses and elastic spring supports.Studying the law of vibration of the beams can be a help in guidingits design and avoiding resonance. Based on the Laplace transformmethod, the mode shape functions and the frequency equations ofthe beams in the typical boundary conditions are derived. Acantilever beam with a lumped mass and a spring is selected toobtain its natural frequencies and mode shape functions. Anexperiment was conducted in order to get the modal parameters ofthe beam based on the NExT-ERA method. By comparing theanalytical and experimental results, the effects of the locations ofthe mass and spring on the modal parameter are discussed. Thevariation of the natural frequencies was obtained with the changingstiffness coefficient and mass coefficient, respectively. The findingsprovide a reference for the vibration analysis methods and thelumped parameters layout design of elastic beams used inengineering.     

4月份国际原油市场回顾

近期油价水平 4月份，多重利好掌控市场，油价也持续走高。美国西得克萨斯原油（WTI）近月期货价格从100美元／桶一路飙升至119美元／桶以上。美元持续疲软是促使4月份油价飙升的主要原因。此外，近期美国油品库存继续反季节下跌，尼日利亚供应不稳定，英国和法国罢工事件促使原油市场基本面处于利好气氛中。