流函数法在减径拔管上限分析中的应用

应用流函数法建立减径拔管的动可容速度场，用上限原理得出减径拔管的上限解，分析了摩擦状态，变形程度及相对壁厚等工艺参数对拉拔载荷的影响，从而得出最佳工艺参数。     

Tuning of transfer functions for analysis of wave–ship interactions

Transfer functions are often used together with a wave spectrum for analysis of wave–ship interactions, where one application addresses the prediction of wave-induced motions or other types of global responses. This paper presents a simple and practical method which can be used to tune the transfer function of such responses to facilitate improved prediction capability. The input to the method consists of a measured response, i.e. time series sequences from a given sensor, the 2D wave spectrum characterising the seaway in which the measurements are taken, and an initial estimate of the transfer function for the response in study. The paper presents results obtained using data from an in-service container ship. The 2D wave spectra are taken from the ERA5 database, while the transfer function is computed by a simple closed-form expression. The paper shows that the application of the tuned transfer function leads to predictions which are significantly improved compared to using the transfer function without tuning.     

做好交通行业政务信息工作的研究

以山东省港航业政务信息工作为例，对如何做好交通行业政务信息工作进行研究。做好交通行业政务信息工作的关键是要根据交通行业的特点，构建交通政务信息网络；围绕港航行业管理内容，突出港航信息特色；同时也离不开领导的重视和支持。     

Including congestion effects in urban road traffic CO2 emissions modelling: Do Local Government Authorities have the right options?

Tailpipe emissions from vehicles on urban road networks have damaging impacts, with the problem exacerbated by the common occurrence of congestion. This article focuses on carbon dioxide because it is the largest constituent of road traffic greenhouse gas emissions. Local Government Authorities (LGAs) are typically responsible for facilitating mitigation of these emissions, and critical to this task is the ability to assess the impact of transport interventions on road traffic emissions for a whole network.This article presents a contemporary review of literature concerning road traffic data and its use by LGAs in emissions models (EMs). Emphasis on the practicalities of using data readily available to LGAs to estimate network level emissions and inform effective policy is a relatively new research area, and this article summarises achievements so far. Results of the literature review indicate that readily available data are aggregated at traffic level rather than disaggregated at individual vehicle level. Hence, a hypothesis is put forward that optimal EM complexity is one using traffic variables as inputs, allowing LGAs to capture the influence of congestion whilst avoiding the complexity of detailed EMs that estimate emissions at vehicle level.Existing methodologies for estimating network emissions based on traffic variables typically have limitations. Conclusions are that LGAs do not necessarily have the right options, and that more research in this domain is required, both to quantify accuracy and to further develop EMs that explicitly include congestion, whilst remaining within LGA resource constraints.     

防止高校图书馆电子阅览室功能弱化的对策

高校网络的发展和计算机的普及,弱化了电子阅览室的功能,而高校图书馆信息资源建设和读者服务与用户需求存在着差距,所以高校图书馆应加强特色信息数据库建设,加强区域合作,开展特色服务,是电子阅览室可持续发展的对策。     

构建网络安全体系,保障电子政务畅通

构建安全的电子政务网络体系对于推动政府工作信息化、促进政务公开、提高政府办公效率、构建和谐社会是非常重要的.在详细介绍目前网络安全一些认识误区的基础上,结合实际工作经验,从技术实施、制度建设方面阐述了如何构建安全的网络体系的问题.     

深水张力腿平台非线性涡激特性及水动力性能研究

平台涡激运动易导致立管及系泊系统疲劳损伤,危害其安全稳定性。该文引入雷诺平均法求解NS方程结合DES湍流模型对不同流速下深水张力腿平台三维涡激运动及流场特性进行了数值研究。采用GAMBIT软件建立计算网格,将求解动力学控制方程的代码嵌入UDF求解器中,采用动网格技术实现流场更新并求得作用于平台立柱和浮箱上的瞬时升力和拖曳力。采用最大值统计法和均方根统计法进行数据统计。研究发现:张力腿平台涡激运动流向振幅的大小随着约化速度的增大而增大,但在小范围内波动;横向振幅曲线最大值出现在0°来流、约化速度U~*=8.0处,大小为0.38D;三种来流工况流向平衡位置随无因次速度的增大而增大,但增长速度有所区别,22.5°和45°下流向平衡位置的增加速度要明显大于0°来流;22.5°来流升力系数谱能量较为分散,立柱及浮箱之间的干扰具有强非线性效应;最后对张力腿平台表面压力系数分布及涡量等值面特性进行了分析和探讨。     

会话中话语标记语Yes的语用功能分析

话语标记语(discourse marker)是话语交际过程中的一种明示导向标记,对话语的生成和理解都起着至关重要的作用.Sperber和Wilson提出的关联理论为探讨语言形式与语用理解之间的关系提供了一个很好的理论框架,本文依据关联理论的框架,利用收集的口语语料,分析和归纳了话语标记语Yes在会话中的语用功能,以帮助人们更好地理解和生成话语.     

治国方略与人性假设

中西不同的人性论预设,导致了不同的治国方略和制度路径.人性善或经验主义人性恶假设是人治和专制治理的理论基础;理性主义人性恶假设是法治的理论基础.人性善强调了道德自律的可能性,但缺乏预警机制,理性主义人性恶的不足在于过分强调人性中的阴暗,忽略了人的主动性.人性善或经验主义人性恶假设是人治和专制治理的理论基础;理性主义人性恶假设是法治的理论基础.人性善强调了道德自律的可能性,但缺乏预警机制,理性主义人性恶的不足在于过分强调人性中的阴暗,忽略了人的主动性.理想的治理结构应该是德治与法治的统一,其理论基础是理性与非理性,善与恶相统一的人性论假设.理想的治理结构应该是德治与法治的统一,其理论基础是理性与非理性,善与恶相统一的人性论假设.     

地铁地下空间的功能与商业空间开发

地铁的地下空间功能多种多样,编制地铁地下空间规划必须关注地铁地下空间综合功能.在地铁地下商业空间的开发中,确定商业开发量应建立在一定分析的基础上,才能为地铁站点地下空间的设计和开发利用提供依据.以成都地铁1号线南段地下空间的开发规划为例,着重论述了地铁地下空间的功能与商业开发.