航道整治水下炸礁方法

介绍了航道整治工程中水下炸礁施工工艺及施工经验,为类似工程提供借鉴。     

地下水渗流应力耦合分析

随着地下空间的不断开发利用,涌现出很多关于地下工程的相关研究。通过分析地下水的布局以及与岩土体的相互作用,来分析地下水渗流-应力耦合的效应影响。     

天峨至乐业二级公路K19＋533高架大桥挖孔灌注桩施工

文章介绍了天峨至乐业二级公路№6标K19＋533高架大桥2^#与3^墩桩孔开挖、钢筋骨架的制作及吊装、水下砼的灌注及出现灌注事故时的现场处理方法。由于施工人员的艰苦努力,且在出现灌注事故时现场处理措施得当,所以该高架大桥桩基施工最终顺利完成,桩基成品质量全部符合《公路工程质量检验评定标准》要求。     

半水半陆的低桩承台基础施工

本文结合城南河大桥主墩承台的施工过程,提出了钢板桩围堰湿法施工的设计思路,介绍了钢板桩围堰配合水下吸砂施工工艺在半水半陆中基础施工的应用情况。     

GPS-RTK在拉浪水电站水下地形测量中的应用

文章结合拉浪水电站的实际情况,介绍了在复杂地形条件下布设GPS控制网及RTK配合测量水下地形的方法,并就相关难点问题进行了探讨。     

基于因果分析图法的安哥拉疏浚工程水下岩石爆破质量控制

安哥拉疏浚工程施工时,水下岩石爆破出现未爆浅点的质量问题。项目部成立QC小组,应用因果分析图法分层次查找原因,运用统筹方法安排验证方案,在最短时间内找出质量问题主因;并运用AHP方法和价值工程理论对方案进行了优化,在保证工期前提下,取得了良好的经济效益。     

水声测距通信一体化技术分析及试验

根据水声导航与通信一体化设计需求,分析了水声测距通信一体化的技术体制,对水声测距通信一体化共用同步头做了比较,并对线性调频、双曲线调频、伪随机扩频3种同步方式下的测距误差及误码率进行仿真分析,最后采用伪随机扩频同步头的水声modem实物开展水池测试试验,结果表明,采用9阶的m序扩频码时间分辨率为0.5 ms,水声测距通信一体化的测距和通信性能满足预期。水声测距通信一体化技术研究有助于将来研制小型化的水下多功能一体化水声设备。     

SCUBA divers' underwater responsible behaviour: can environmental concern and divers' attitude make a difference?

The objective of this study is to examine the relationship between general environmental attitude and specific SCUBA diving attitude with responsible behaviour among divers underwater. The empirical data were collected from divers (N?=?413) at the five most popular islands for SCUBA diving in Malaysia using the combination of purposeful, quota and convenience sampling. The revised New Environmental Paradigm (NEP) scale [Dunlap, R.E., Van Liere, K., Mertig, A., & Jones, R. (2000). Measuring endorsement of the New Ecological Paradigm: A revised NEP scale. Journal of Social Issues, 56(3), 425–442] was utilised to measure the general environmental concern (attitude) among divers. Measurement of SCUBA diving attitude and underwater responsible behaviour was self-developed based on both literature review and expert opinions. Correlation and regression analyses were employed to examine the relationships among the constructs. Divers are mostly ecocentric and highly responsible underwater and possess a positive SCUBA diving attitude. Divers' behaviour underwater has a direct relationship with both environmental concern and specific SCUBA diving attitude. The latter partially mediates the relationship between environmental concern and responsible behaviour underwater. The cognitive and conative dimensions of specific SCUBA diving attitude are strongly related to skill diving behaviour and safety diving behaviour, respectively. The affective dimension of specific SCUBA diving attitude has a strong relationship with non-contact diving behaviour. Based on the study findings, this paper presents some of its theoretical and managerial contributions.     

一种用于水声传感网的MAC层协议

针对分簇的水声传感网,提出了一种基于时分多址（TDMA）的MAC层协议——Cluster-TDMA。该协议主要由规划阶段和传输阶段组成。规划阶段,首先由网关节点规划能造成簇间干扰的子节点的传输,其次由各簇头节点分别规划本簇内其他子节点的传输;传输阶段,子节点根据规划表周期性地向簇头节点发送数据,这些数据最终汇聚到网关节点。该协议简单有效地解决了引起簇间干扰子结点的传输规划问题。C++仿真实验表明,该协议具有良好的吞吐率和能量效率性能。     

水下爆炸冲击波载荷中相似理论的重要应用价值

本文主要是在相似理论的基础上,用数值仿真实验的方法,对舰船结构遭受到水下爆炸冲击波荷载作用时的相似性问题进行研究和探讨。本文也主要对水下爆炸冲击波载荷中相似理论的应用进行重点分析,对其在实际应用中的价值做以阐述。