Time-series analysis of remote-sensed chlorophyll and environmental factors in the Santa Monica–San Pedro Basin off Southern California

The time-series of remote-sensed surface chlorophyll concentration measured by SeaWiFS radiometer from September 1997 to December 2001 and the relevant hydrological and meteorological factors (remote-sensed sea surface temperature, atmospheric precipitation, air temperature and wind stress) in Santa Monica Bay and adjacent waters off southern California were analyzed using wavelet and cross-correlation statistical methods. All parameters exhibited evident seasonal patterns of variation. Wavelet analysis revealed salient long-term variations most evident in air temperature during El Niño 1997–1998 and in wind stress during La Niña 1998–1999. Short-period (<100 days) variations of remote-sensed chlorophyll biomass were mostly typical to spring seasons. Chlorophyll biomass was significantly correlated with air temperature and wind stress: an increase of chlorophyll biomass followed with 5–6-day time lag an increase of wind stress accompanied by a simultaneous decrease of air temperature. The mechanism of these variations was an intensification of phytoplankton growth resulting from the mixing of water column by wind stress and entrainment of nutrients into the euphotic layer.     

半约束模型试验--一种验证随浪和斜浪中波浪力计算的手段

本文采用半约束模型试验技术，对一条高速船在规则波中随浪和斜浪工况进行了流体动力系列试验，以探讨航运的安全性，验证作用于船体上波浪力的估算方法。对每次试验，以波动方程的形式采用数值估算方法确定环绕船模的波浪运动的时间历程。并用同样的方法从测量数据中提取垂荡和纵摇与模型测量运动，一阶波导纵荡、横荡作用力和首摇力矩。因此合理比较理论计算的波浪力与力矩的时间历程成为可能。这表明SSPA海事动力学的研究所(MDL)模型试验设施可以提供高质量的测量，与所述计算方法结合起来可用来验证理论计算和建立半经验方法。     

理解消费者对质量的定义

汽车产品的质量总是会受到巨大的关注。质量较差会导致财务成本的增加,这使得制造商把提升质量作为一项商业必要的手段。过去的数年中有无数方法和流程被用来减少浪费和消除缺陷 (比如6-Sigma法和TQM完全质量管理法)。我们并不缺少这样的衡量工具,来衡量因质量问题和返工而产生的负面经济效益。运用这些衡量工具能够理解质量对每辆车或者公司的盈利能力造成的影响,并且帮助公司取得显著的产品质     

摩托车催化剂的研究探讨

根据摩托车工况排放曲线、过量空气系数λ等,来评价各种催化剂的性能,选择成本增加最少、排放控制效果最合适的催化剂方案。在选定过量空气系数λ的条件下,通过改变催化剂的体积、孔密度、贵金属及涂层的配方,对催化剂性能进行表征,用于催化剂方案的选择。     

速度监控装置设计中绝缘节校正距离误差的探讨

介绍速度监控装置中利用信号系统绝缘节信息进行距离校正的基本原理及其可能产生的误差，以提供设计中参考．     

锰对工人血清胆碱酯酶活性和尿香草扁桃酸含量的影响

为探讨职业性锰暴露对工人血清胆碱酯酶活性和尿香草扁桃酸(VMA)水平的影响,对55名锰粉加工工人、55名冶炼工人和55名对照工人进行了调查.结果显示,锰粉加工作业环境空气锰尘中MnO2几何均数为1.96 mg/m3(0.17～22.24mg/m3),样品超标率为88.9%;冶炼作业环境空气锰烟尘中MnO2几何均值为0.65 mg/m3(0.06～6.67mg/m3),样品超标率为93.3%.锰粉加工和冶炼组头晕头痛、睡眠障碍的主诉率明显高于对照组(P＜0.01),锰粉加工组血清胆碱酯酶活性明显增高(P＜0.05),提示这可能是锰的早期神经毒性所致.     

Maritime education in cross cultural settings

Cross-cultural interaction is growing in our global economy. Expanding maritime trade in ports around the world reinforces the need for standardized training and education to cope with new global technologies and logistics systems. Working, studying and interacting in cross-cultural settings can lead to problems of misunderstandings and misinterpretations among people having different worldviews.     

浅谈青藏线转辙设备的养护与维修

本文根据CTS2轨枕式转辙机本身的特点以及青藏铁路的管理模式，从养护、维修的角度，简要说明了CTS2轨枕式转辙机需要的养护工作量、故障处理方法、维修特点及在施工中要注意的问题。     

A continuous network design model in stochastic user equilibrium based on sensitivity analysis

The continuous network design problem (CNDP) is known to be difficult to solve due to the intrinsic properties of non‐convexity and nonlinearity. Such kinds of CNDP can be formulated as a bi‐level programme, in which the upper level represents the designer's decisions and the lower level the travellers' responses. Formulations of this kind can be classified as either Stackelberg approaches or Nash ones according to the relationship between the upper level and the lower level parts. This paper formulates the CNDP for road expansion based on Stackelberg game where leader and follower exist, and allows for variety of travellers' behaviour in choosing their routes. In order to solve the problem by the Stackelberg approach, we need a relation between link flows and design parameters. For this purpose, we use a logit route choice model, which provides this in an explicit closed‐form function. This model is applied to two example road networks to test and briefly compare the results between the Stackelberg and Nash approaches to explore the differences between them.     

冲绳城市单轨运输系统

简要介绍了冲绳城市单轨运输系统的设施和车辆概况.