科考船雷达桅杆减振设计

为防止雷达桅杆振动过大影响雷达桅杆上设备的正常使用,对其进行减振设计.采用有限元方法对某科考船的雷达桅结构进行有限元建模和详细的振动特性分析,在此基础上开展减振设计,使雷达桅杆的振动大幅下降.提出的计算设计方法和所得结果对此类船型的雷达桅杆设计具有重要的参考价值.     

高墩大跨铁路连续梁桥的减震设计与施工

桥梁工程结构的减震隔震设计多采用增加阻尼和被动控制的思想与方法，即通过消能来达到减震抗震的目的。以宜万铁路叶溪河大桥为例，阐述了减震隔震的设计方法以及支座施工应注意的事项。     

预应力混凝土梁桥非荷载裂缝的预防与控制

依据工程实践与施工经验,对大跨度预应力混凝土连续梁式桥在施工阶段发生的非荷载裂缝——收缩裂缝、温度裂缝及挂篮或支架变形引起的变形裂缝之成因进行归纳分析。结合老庄河特大桥的结构特点与自然环境,提出这些非荷载裂缝的预防与控制措施,最终实践证明这些措施是可行而有效的。     

浅析企业的电子人力资源管理

随着电子商务的产生和发展,作为电子商务和传统人力资源管理相结合的产物--电子人力资源管理也逐渐发展起来,并越来越受到企业管理者的重视.本文主要介绍电子人力资源管理的产生、涵义和对企业的价值.     

海监执法船设计探讨

海洋权益斗争日趋激烈,大量海洋维权巡航执法公务船需要设计、建造,本文就海监执法船的设计特点、主要技术指标的选择、总体、轮机设计要点等问题进行了探讨,以期为同类船舶设计提供参考。     

科考船机舱风机室噪声控制设计

以"中山大学"号海洋综合科学考察实习船为研究对象,为减小机舱噪声,设计过程中综合风机室布置和机舱通风管系布置,分析消声器、消声百叶窗和壁面吸隔声处理等各种常用噪声控制措施的利弊,优选出适合该船风机室的噪声控制方案,并进行实船测试验证.实船测试表明,噪声控制效果显著,研究方案可为同类型或其他类型船舶的风机室噪声控制提供设计参考.     

100吨级缉私艇推进系统方案论证

本文介绍了100吨级缉私艇推进系统的选型配置,通过对两种布置方案和三种型号主机的性能参数对比分析,选定本艇的推进装置方案,试图建立一种量化的评价模块。     

空气污染对室内空气品质的影响

通过将各空气污染因子区分为物理性、化学性和生物性等因子,分别分析了它们对人体的医学危害性,揭示了目前影响室内空气品质的一些主要因素,并讨论了在空调工况下空气污染对室内空气品质的影响问题.     

我国体育产业发展中存在的问题及应对措施

体育产业正在成为新世纪我国新的朝阳产业,但是,我国的体育产业目前还处在发展的初级阶段,真正实现体育产业化还需要一个相当长的时期.其发展过程中还存在诸多问题,亟待我们解决.     

多种边界条件下任意铺层层合板的基频解析解（英文）

In recent years, as the composite laminated plates are widely used in engineering practice such as aerospace, marine and building engineering, the vibration problem of the composite laminated plates is becoming more and more important. Frequency, especially the fundamental frequency, has been considered as an important factor in vibration problem. In this paper, a calculation method of the fundamental frequency of arbitrary laminated plates under various boundary conditions is proposed. The vibration differential equation of the laminated plates is established at the beginning of this paper and the frequency formulae of specialty orthotropic laminated plates under various boundary conditions and antisymmetric angle-ply laminated plates with simply-supported edges are investigated. They are proved to be correct. Simple algorithm of the fundamental frequency for multilayer antisymmetric and arbitrary laminated plates under various boundary conditions is studied by a series of typical examples. From the perspective of coupling, when the number of laminated plates layers N 8–10, some coupling influence on the fundamental frequency can be neglected. It is reasonable to use specialty orthotropic laminated plates with the same thickness but less layers to calculate the corresponding fundamental frequency of laminated plates. Several examples are conducted to prove correctness of this conclusion. At the end of this paper, the influence of the selected number of layers of specialty orthotropic laminates on the fundamental frequency is investigated. The accuracy and complexity are determined by the number of layers. It is necessary to use proper number of layers of special orthotropic laminates with the same thickness to simulate the fundamental frequency in different boundary conditions.