“粤剧红船”电网及电力推进系统设计

随着节能减排要求的提高,船舶采用电力推进将越来越普及。全回转舵桨电力推进具有舵桨一体化、操纵性能良好、振动噪音小等优点,尤其适用于内河等机动操纵受限的船舶。"粤剧红船"采用全回转舵桨电力推进装置,大幅度提升了旅客观光体验的舒适性。     

全回转桨船静水及风浪中模型试验对比分析

针对全回转桨船型及其在风浪中操纵性能分析规程的不完备性,以某全回转桨船模为研究对象,在湖泊中开展回转、Z形以及航向稳定性的风浪大尺度自航模试验,并与静水中的试验结果进行对比,分析总结全回转桨船舶在静水及风浪中的操纵性能,为风浪中船舶操纵试验规程的建立提供依据。     

吊舱式电力推进装置的应用

详尽介绍了全回转舵桨合一、吊舱式电力推进的性能及电力推进系统的组成,并结合我国首艘成功采用吊舱式电力推进装置船舶的实施效果,阐述了电力推进技术的先进性。     

吊舱式电力推进装置的首次成功应用

全回转舵桨合一、吊舱式电力推进装置是新颖的船舶动力装置.结合我国首艘成功采用吊舱式电力推进装置船舶的实施效果,较详尽地介绍了电力推进技术的先进性能.     

大功率海工可调螺距全回转推进系统

为了适应海上恶劣的气候及满足作业需求,船舶和海工平台对推进性能和操纵性能的要求越来越高。大功率海工全回转推进系统是一种推进和操控合一的可提供任意方向推力的全方向推进装置,也是能够满足海工装备特殊要求的最佳推进与操控合一的动力系统,关键技术包括水动力、动力系统、回转系统、调距机构等。文中介绍了大功率海工可调螺距全回转推进系统的构成及其功能实现的方法。     

全回转双桨船舶操纵性预报

为实现对全回转桨船操纵性的预报,根据船舶分离型运动模型的建模方法,考虑全回转桨在水平面上周转的灵活性与受力的特殊性,着重分析双桨受力,建立适用于全回转对转桨船模的MMG操纵运动数学模型;模拟船模进行PMM运动,求得水动力导数并采用四阶龙格—库塔法对操纵性常微分方程进行求解;对某工程船在静水中的回转运动和Z形操纵运动进行数值仿真预报,并将预报结果与自航模操纵性试验结果进行对比。结果表明,两者吻合度较高,验证了针对全回转对转桨船模所建立的船舶运动数学模型的有效性,可为全回转桨船的操纵性预报提供一种较为可靠且行之有效的方法。     

CFD数值模拟船舶在波浪中的回转操纵运动

[目的]船舶回转操纵运动能够反映出船舶的回转特性,与船舶的航行安全密切相关。[方法]为此,采用基于重叠网格技术的CFD求解器naoe-FOAM-SJTU,对标准船模ONRT在波浪中自由回转操纵运动进行直接数值模拟。运用动态重叠网格技术求解船、桨、舵系统复杂运动,计算中,螺旋桨转速对应于静水中的船模自航点进行35°转舵,实现自由回转船舶操纵运动。通过全粘性流场的整体求解,给出波浪中自由回转操纵运动中船舶六自由度运动、螺旋桨和舵的水动力载荷变化,以及波浪中船舶的回转圈特征参数,并与同试验结果进行对比。通过数值计算得到精细的流场信息,分析波浪对船舶自由回转操纵运动的影响。[结果]数值预报得到的船舶运动轨迹、回转圈参数与试验值吻合较好,证明naoe-FOAM-SJTU求解器对于波浪中船—桨—舵相互作用下的船舶自由回转操纵运动数值预报的适用性和可靠性。[结论]船舶回转操纵运动的数值模拟,可为回转性能的评估提供有效的前期评估手段。     

新型船舶推进操纵系统的研制

野村公司研制了一种新型的船舶推进操纵系统,应用这种系统可以自由而可靠地使船舶离靠岸、进行海难救助时的快速操纵、停船时的横移和原地回转以及低速移动。这种装置如图所示,在船底的前后部各安装一台导管舵桨(具有推进螺旋桨的舵),用图中所示的操舵用     

新型20m全回转排档船

简要介绍新型20m全回转排档船的设计理念、局部线型特点、排档船舶的结构特征、全回转舵桨的应用、操纵性能及舾装等内容。     

38m汽车渡船全回转推进装置的改造

采用双向四桨、双舵常规推进的38m汽车渡船改造为采用全回转推进装置的新型38m汽车渡船,可原地回转和横移,使操纵性能有一个质的提高。无水下附体阻力,使航速提高25%～35%,节能效果显著并且提高了船舶的利用率。     

Hydrology, sediment yield, erosion and sedimentation rates in the estuarine environment of the Ria de Vigo, Galicia, Spain

The aim of this study is to provide a budget study with calculated erosion rates. Three methods have been used to calculate sediment yield and denudation rates in the Ria de Vigo: (1) measurements of sediment loads, (2) measurements of sediment accumulation rates at the coast, (3) theoretical calculations of potential denudation. Sediment loads and water discharge were measured over a period of 14 months from May 1997 to July 1998. Two of the tributaries entering the Ria de Vigo were monitored for 12 more months, from May 2000 to May 2001, to observe changes in discharge and sediment loads. This period corresponded with atypical precipitation, with peak monthly values (600 mm) three times higher than those on record.Water rating curves are typically exponential. Suspended and dissolved loads vary for different rivers, showing values of 1.5 to 130 mg/l during 1997/1998. For 2000/2001, these values are twice as high. Suspended load versus discharge relationships for 1997/1998 were logarithmic, but data from 2000/2001 does not fit the same equation. Dissolved loads are several times higher than suspended loads in almost all cases. Dissolved load concentrations vary more widely with discharge than suspended loads. This is probably due to local pollution and contamination from marine spray in areas closer to the sea.Second, erosion rates and bed load sediment yields were calculated from accumulation rates at the Ramallosa Complex. Well-preserved estuarine and tidal sediments, associated with the Minor River, have accumulated in this area during the Holocene. ¹⁴C ages allow calculation of sedimentation rates (SR) for two intervals. The lower interval extends from 2001 to 484 years BP and yields an SR of 1.12 mm/a. The upper interval extends from 484 years BP to the present and has an SR of 3.3–4.4 mm/a. These differences may be explained by basin dynamics as the beach progressively encloses the area and also by human interference. From sedimentary facies analysis it is concluded that 90% to 95% of the accumulated deposits were transferred to the basin as bed load. Muddy deposits (mostly marshes) are better developed at the upper part of the sediment pile, and inner areas, indicating a progressive shallowing and filling up of the basin. Most of suspended load is exported to the ria, whereas the Ramallosa Complex acts as a sediment sink for bed load derived material.Calculated potential erosion rates using Ahnert's [Am. J. Sci. 268 (1970) 243] equation show lower values than those estimated from river load concentrations. Potential erosion rates for the Minor River are higher than for the Lagares River which contrast with mechanical denudation rate values from river loads during 1997/1998 which are higher for the Lagares River. During 2000/2001 MDR values were higher than those of the potential erosion rates for both rivers, in line with the extremely high precipitation. Higher values in the Lagares could be in part due to human interference.     

激情·科学·发展——中远船务：从“修船航母”到“海工黑马”

2009年6月22日,国内最大的修船企业集团--中远船务工程集团有限公司迎来了8周岁的生日.几天后的6月28日,中远船务建造的全球最先进的首座超深水海洋钻探储油平台命名,这昭示着这家"航母"级的修船企业集团不仅在修船业界独树一帜,同时也在船舶和海洋工程建造市场占据了重要一席.     

Synoptic transects on the distribution of trace elements (Hg,Pb, Cd,Cu, Ni,Zn, Co,Mn, Fe,and Al) in surface waters of the Northern- and Southern East Atlantic

Surface seawater samples were taken in the framework of the GEOTRACES program on “POLARSTERN” expedition ANT XXIII/1 in the Eastern Atlantic in 2005 to study the distribution of the trace elements Hg (mercury), Pb (lead), Cd (cadmium), Cu (copper), Ni (nickel), Zn (zinc), Co (cobalt), Mn (manganese), Fe (iron), and Al (aluminium). With the exception of Hg, results were compared to earlier datasets from 1989 to 1990. The particulate fraction averaged over the transect was calculated to be 49% for Cd, 23% for Mn and 50% for Fe indicating a release of these TEI's (trace elements and their isotopes) from a leachable SPM fraction in the stored and acidified samples.Total Pb concentrations ranged between 5 and 20 pmol kg^? 1 in 2005 with highest values in the ITCZ (intertropical convergence zone). In 1989 Pb concentrations were twice as high in the region of the ITCZ, while by a factor of 10–15 higher values were obtained in the North Atlantic.Total Cd and Co are dominated, by different seasonal upwelling regimes (Equatorial upwelling, Guinea Dome, Angola Dome).Total Cu, Ni, Fe, Mn and Al show nearly identical concentrations in 1990 and 2005. For total manganese and aluminium strong maxima (3–4 nmol kg^? 1 and 55 nmol kg^? 1 respectively) are observed between 23°N and 0°, while the Fe maximum (6–9 nmol kg^? 1) is located at 7°N. Total Hg concentrations ranged between 0.5 and 4.5 pmol kg^? 1.     

迎接挑战 抓住机遇 理清思路 持续发展锦州港

阐述锦州港依托明显的区位优势,抓住机遇,通过体制创新和有效的市场开发,实现了港口吞吐量的快速增长,并发展成为我国北方沿海的一个重要港口.针对西部大开发的战略决策和振兴东北地区老工业基地带来的巨大运输需求,为实现锦州港的持续发展提出了建议.     

节能环保型抗沉式铝合金游艇的研制

叙述了南太湖区域某企业新近研制了一艘集节能、环保、环境友好型为一体的抗沉式铝合金游艇,其上的关键技术包括:游艇抗沉措施、降温系统的工作原理和实效、以及铝合金船体制作的焊接技术要求和强度计算原则等。     

争议激烈的铁矿石价格谈判

巴西矿业公司淡水河谷公司（Vale）正在采取措施控制其更多的供应链建设，包括在江苏熔盛重工集团有限公司建造的超大型矿砂船（VLOC）。     

LNG，船舶环保燃料新宠

如果我们对比蒙大拿州冰河国家公园历史和当前的照片，我们就可以轻易地发现冰川正在消融，海平面正在上升。目前人们普遍认为全球变暖是碳排放造成的恶果。2007年2月2日，联合国环境规划署发布了迄今为止关于气候变化最权威的科学报导。有九成的把握认为，矿物燃料的使用及其他人类活动导致了气候变化。     

Public opinion and the environment: Ecology,the coastal zone,and public policy

Abstract

In a public opinion survey conducted in Santa Barbara county, California, respondents were interviewed regarding their feelings on coastal zone development, within a context of broader environmental and political issues.

A high degree of expressed concern for the environment was found, but the data also indicate a widespread reluctance to allocate a greater share of personal income to improve environmental quality.

Among the issues dealt with are citizen views on environmental problems, the effectiveness of government in the environmental field, offshore oil drilling, and coastal zone development.

The results show that on each of the issues analyzed, a person's education, age, and the extent of his political participation are the major factors which determine his concern for the environment. Additional variables appear to have some significance in determining attitudes toward local environmental projects and perceptions of government.

Offered are implications of the findings for the future of organized action on environmental problems.     

论AIS、RADAR、VHF在船舶避碰中的优势互补

重点阐述了AIS、VHF、RADAR在船舶避碰中的优势和不足,船舶驾驶员只有全面掌握其性能和特点,恰当地使用才能保证船舶安全。     

浅谈湛江VTS中心监控的现状与雷达站、CCTV、AIS的建设

分析湛江VTS监控现状,提出存在的问题和相关VTS雷达站的扩建、CCTV、AIS建设的建议,更进一步完善VTS对湛江港的监控功能。