一种解决弯桥内外侧支座反力不均的方法

很多城市立交桥的匝道桥处于曲线半径较小的路段上，由于外荷载对曲线内外侧的作用不同——反力是不均匀的，位于曲线半径上的梁桥需要解决施工和运营过程中的反力不均问题。以某市某立交S1匝道桥为背景，对该桥设计计算中包括强迫位移调整反力的方法及效果进行阐述。通过对是否施加强迫位移及施加不同数值强迫位移的比较，对曲线段墩顶反力进行分析得出其规律，从而选择合理的强迫位移值并确定施工过程中的施加方法及采取相应措施。经施工现场测试，S100#~S102#匝道桥内外侧反力趋势符合规律，受力有所改善。     

微机控制铁路罐车阀类试验台的研究

主要介绍微机控制铁路罐车阀类试验台的组成、特点;对微机控制铁路罐车阀类试验台的控制系统进行了详细论述。     

海洋工程船的自动化

海洋工程船的自动化控制是高度综合性的自动化系统，是正在迅猛发展的船舶高新技术的热点。本文主要通过对大型挖泥船及起重／铺管船的自动化控制的应用综述，归纳了海洋工程船的自动化类型和结构的基本模式，并提出了若干建议。     

基于虚拟样机技术的机车车辆结构疲劳寿命仿真

提出一种多体系统仿真和有限元分析相互结合进行虚拟样机疲劳寿命预测的方法.该法用于处理随机动载荷作用下转向架构架的疲劳设计.作用在复杂结构上的时变动载荷历程可以通过应用多体系统分析软件SIMPACK的多体仿真技术获得.在ANSYS中利用单位载荷作用下的准静态应力/应变分析技术计算结构危险节点应力及关键区域.模态分析技术用来获得结构固有频率和模态振型.基于危险应力状态(包括单轴,成比例和非比例多轴)、动载荷时间历程以及Palmigren-Miner损伤理论.最后利用FE-FATIGUE软件的安全强度因子分析法进行标准时域的结构疲劳寿命预测,其中包括应力应变的循环计数,损伤预测和最终寿命估计.     

塑料排水板水下施工工艺

主要介绍温州乐清湾软弱地基水下排水板的施工工艺,详细论述了船机设备的选择、施工及质量控制、施工难点及解决措施等,排水板施工进度和质虽满足工程要求,为类似软基工程地基处理施工提供借鉴.     

Metro train-track-tunnel-soil vertical dynamic interactions – semi-analytical approach

An accurate evaluation of the metro train-track-tunnel-soil dynamic interactions is very important in engineering practice. Therefore, an innovative train-track-tunnel-soil vertical coupled model was established to calculate the train-induced dynamic response of the system based on the integration of the substructure method and the semi-analytical approach. The modelling of each subsystem was presented, including the multi-rigid model of the train subsystem, the beam model of the track subsystem and the semi-analytical model of the tunnel-soil subsystem. The wheel-rail contact theory, the fastener force model and the displacement compatibility conditions were used to determine the dynamic interactive relationship between the subsystems. An explicit integral approach was used in the proposed model to analyse the complex system in the time domain which was capable of modelling highly nonlinear loading behaviours of the train-track-tunnel-soil system. The proposed model was validated by comparing with the vehicle-track coupled dynamics software VICT, the Pipe-in-Pipe model and the measured data from the onsite test in the tunnel of Ningbo Metro line 2. An illustrative example of the model was then presented to display the dynamic responses of the tunnel system under the passage of a metro train.     

THE EFFECT OF HBsAg ANTIGENEMIA IN PREGNANT WOMEN ON FETUSES AND INFANTS

ＴＨＥＥＦＦＥＣＴＯＦＨＢｓＡｇＡＮＴＩＧＥＮＥＭＩＡＩＮＰＲＥＧＮＡＮＴＷＯＭＥＮＯＮＦＥＴＵＳＥＳＡＮＤＩＮＦＡＮＴＳＹｕｅＹａｆｅｉ（岳亚飞）；ＺｈａｎｇＳｈｕｌｉｎ（张树林）；ＷｕＬｉｎｇ（吴玲）；ＬｉＧｕｉｌｉｎ（李桂林）；ＤｉＰｅｎｇｃｈ...     

Regional Ocean Governance in China: An Appraisal of the Clean Bohai Sea Program

In 2001 China embarked on an ambitious program to improve water quality through creation of the Clean Bohai Sea Program (CBSP). It is the first regional ocean governance program in China. The joint conference of central and local government units directed CBSP under the leadership of the State Environment Protection Administration. To meet the environmental objectives established by the joint conference local governments must pay for the program and operate it, but to date they have not been able to fully fund the effort. Although data indicate a decline of polluted discharges to the Bohai, one tabulation shows that the area of the sea that is polluted has increased each year from 2001 to 2005. Future enhancement of CBSP depends on revising incentives to better link local environmental programs and development, establishing funding mechanisms to equitably spread costs throughout watersheds, and creating comprehensive monitoring programs to better appraise program results.     

Ship underwater noise assessment by the Acoustic Analogy part II: hydroacoustic analysis of a ship scaled model

In this paper the Acoustic Analogy is used to predict the underwater noise from a complete scaled ship model in a steady course. The numerical investigation is performed by coupling an incompressible RANS code, equipped with a level-set approach to account for the fundamental time evolution of the free surface, to a FWH-based hydroacoustic solver, here suitably designed to manage the huge set of data coming from a full-unsteady hydrodynamic simulation. The results reveal the overall limited contribution from the propeller thickness and loading noise components and the fundamental one from the nonlinear quadrupole sources. The comparison between the hydrodynamic and hydroacoustic solutions point out the noticeable scattering effects due to the hull surface, the possible influence of sound refractions at the free surface and, above all, the leading role played by the turbulent fluctuating component of the velocity field. Finally, by computing the pressure time histories at a prescribed set of virtual hydrophones and turning them into the frequency domain, the ship noise footprint in dB is traced out, thus showing how the Acoustic Analogy can be effectively used to analyze the ship hydroacoustic behavior, both in terms of amplitude and directivity.     

拆船公约带来的法律责任和风险分析

国际海事组织2009年在香港通过的《2009香港国际安全与无害环境拆船公约》对船舶有害物的管理提出了法律要求.公约对船舶制造、营运管理以及拆船作业进行了规范,对航运界的多个利益方提出了要求.根据公约以及配套的一系列导则要求,对船舶有害物质全生命周期管理的法律责任及风险进行了分析,并对各利益方的具体履约要求进行了梳理,为我国航运界正确履约提供参考.