可编程定时计数器8254的IP软核设计

介绍了VHDL语言在可编程定时计数器8254设计中的具体应用，说明实现电子电路设计自动化(EDA)的过程和EDA技术在数字系统设计中的重要地位和作用。     

雷达使用与航行安全

目前船用雷达功能比较完善并在继续发展,但是就目前的航海技术而言,正确的雷达观测和使用将会对船舶的安全航行还是起到关键性的作用。本文就雷达在实践中的使用和观测作了比较简单的论述,以期对航海者有所帮助。     

航海实践中"无害通过权"的运用

通过一个真实的案例对“无害通过权”的意义和运用加以分析,提醒航海人员灵活运用联合国海洋法条款中的无害通过权,以一个适当的视角看待海洋国际法。     

内燃机车多功能油耗仪的研制

研究提出了一种内燃机车柴油机在线检测油耗的装置,该设备可在线测量油耗的同时,对柴油机的运行状态进行监测及综合评价,并为司机更合理地操纵机车提供分析手段。     

浅谈电涌保护器在铁路信号设备中的应用

铁路信号是铁路运输安全的重要保障之一。铁路信号系统的雷电过电压保护，则是其免遭雷电过电压侵扰和损坏的有效措施。电涌保护器（SPD）的防护安全性和在线安全性，直接关系到铁路信号的正确与否。串混型SPD是铁路信号系统过电压防护的新用法。分析和了解串混型SPD的工作原理，对SPD的选型、使用和安装都有重要的指导意义。     

船舶避碰中驾驶员的心理紧张状态与其人为失误

本文从心理学和生理学的角度，剖析了船舶避碰中驾驶员的心理紧张状态及其对人为失误的影响，提出了缓解紧张状态、减少人为失误的措施，为研究碰撞海事提供了一个新的途径。     

地下工程围岩稳定分析方法存在的问题与思考

通过对地下工程围岩稳定性分析的历史回顾 ,以及在工程实践中存在问题的分析 ,阐述了对地下工程稳定性分析应采取客观、全面的态度 ,避免一味追求繁琐而精确的计算的道理 ,提倡探索新的研究思想与研究方法。     

隧道施工机械司机防尘防毒呼吸器的实验研究

为在隧道内施工的机械作业司机免受粉尘、爆破烟尘及柴油机废气的污染，利用机械自备电源，正压送风，采用新材料三级过滤和净化液洁治方式，研制成功司机个人防护呼吸器。该呼吸器对司机吸入空气中的烟尘、粉尘清除率大于９２％，氮氧化物清除率接近３０％。     

“蜜蜂式”开发边际油田方案及技术

中海油对边际油田开发一直非常重视，尤其近几年在依托开发方面取得了很大进展；目前高油价推动了无依托边际油田的开发，中海油有关单位都积极参与独立开发边际油田的方案和技术研究，推动边际油田的开发。针对上述有关方面的研究进行介绍。     

Long-term prediction method for the green water load and volume for an assessment of the load line

 To develop a practical prediction method for the green water load and volume on the bow deck in irregular waves, model tests were conducted using a tanker and a cargo ship on a domestic Japanese voyage. The relation between green water load and relative water height at the stem was considered. Based on the finding that the maximum value of the green water load is proportional to the square of the maximum value of the water elevation over the bow top, the probability density functions of the green water load and volume in short-term predictions were proposed. It was verified that the proposed functions show good agreement with the measured distributions, especially in the tails, and were better than conventional functions. Using these functions, long-term predictions of the green water load were carried out. It was confirmed that the present method is more rational than the conventional one for estimating the long-term probability of the green water load. An assessment of the bow height of a domestic Japanese ship from the viewpoint of deck wetness was carried out using these prediction methods. This research was used as the technical background for the revision of domestic rules on load lines, which was enforced in October 2001. Received: July 19, 2002 / Accepted: October 30, 2002 Acknowledgment. Some of the present study was carried out as part of a cooperation project (RR45) with the Shipbuilding Research Association of Japan, supported by the Nippon Foundation. Address correspondence to: Y. Ogawa (e-mail: ogawa@nmri.go.jp)