WorldView-2影像的水深探测能力

以中国南海东岛周边海域为研究区域,利用波段组合法开展高分辨WorldView-2影像的水深探测能力研究,分别建立单波段、双波段和多波段模型,进行精度评价。结果表明：多波段模型反演效果最好,双波段次之,单波段最差;各波段水深探测能力比较：绿波段 >全色波段 >蓝波段 >红波段;前视影像比后视影像的水深反演精度略高,全色波段在水深探测中具有重要作用。     

太极拳理初探

太极拳是思想拳、是哲拳,向来有"三分练,七分悟"之说。学太极拳必先明太极之理,通修炼之路,理清路明,方有所得。文章从什么是真正的太极拳,太极拳到底练什么,太极拳为什么要稳静、缓慢,松与紧的辨证关系,太极拳运动如何放松,太极拳与水的关系等方面进行了分析、探讨,目的在于与广大太极拳爱好者相互切磋、共同提高。     

中国女子水球队与世界一流强队的比较分析

本文结合2008北京奥运会女子水球比赛、2008世界女子水球联赛总决赛和2008欧锦赛女子水球比赛中的相关数据,来综合比较分析中国女子水球队和世界女子水球强队的差距,分析得出中国女子水球队需要加强关键球处理的训练;加强扩大防守、破扩大防守的训练,以及加强防守阵型的应变性;进一步提高"6打5"、"5防6"的成功率;重点提高中锋的门前拿球射门能力和外线队员中远距离的射门能力;加强队员得球后下快攻的意识和防反意识;提高队员比赛时对裁判员判罚的阅读能力。     

Kinematic analysis of the backstroke start: differences between backstroke specialists and non-specialists

Abstract

The purpose of this study was to clarify factors to perform the hole-entry technique in the backstroke start. A total of 16 well-trained Japanese competitive swimmers were divided into two groups (backstroke specialists and non-specialists) to compare their backstroke start motions. Their backstroke motions were videotaped, and two-dimensional co-ordinates for the swimmers were obtained from the video images using direct linear transformation methods. A non-paired t-test and Mann–Whitney U-test were used to analyse the statistical difference of the kinematic variables between the groups. Backstroke specialists showed a significantly shorter 5 m time (P = 0.009, effect size = –1.54), a significantly higher position of the toe (P = 0.010, effect size = 1.47) at signal and of the hip at toe-off (P = 0.002, effect size = 1.94), a significantly larger hip joint angle at toe-off (P = 0.007, effect size = 1.60) and a significantly higher angular velocities of the hip joints (45–85%; P < 0.05) for the normalised time as compared to that of non-specialists. An earlier initiation of the extension and the maintenance of a higher extension speed at the hip joints were important factors in achieving an arched-back posture, which facilitated and water entrance with a small entry range.     

湖库型饮用水安全与生物处理策略

饮用水污染问题日趋严重,本文根据莆田市环保局的统计数据,分析了饮用水污染的原因,提出了利用生物技术对饮用水源进行保护和水质净化,以保障饮用水安全.     

从认知隐喻角度看《诗经》婚恋诗中的水意象

随着认知语言学在过去几十年的发展,人们普遍认识到隐喻不仅仅是一种修辞手段,更是一种认知和推理的过程。本文以《诗经》婚恋诗中的水意象作为研究对象,旨在探索和验证隐喻作为人类思维和认知方式的普遍性及其存在程度,并探求这些隐喻能否在一定程度上反映人类认知的共性。     

新疆塔里木河下游生态输水对地下水位和水质的影响

本文结合塔里木河下游六次生态输水过程（2000年～2004年）和对40眼地下水监测井水质分析资料，重点研究了塔里木河下游生态输水对地下水位和地下水质的影响以及地下水位与水质的变化关系。研究结果表明：塔里木河下游地下水位和水质状况随六次间歇性生态输水发生明显变化。河道两侧地下水位埋深在输水过程中明显抬升，由输水前的8m～11m，抬升到5m～6m；地下水质表现为：在输水初期，地下水水化学成分中的主要离子含量和矿化度都较高，随着生态输水的实施，矿化度开始下降，下降幅度先快后慢。其中在距河道不同位置处，由于受输水影响强度的差异和地下水位抬升状况的变化，地下水矿化度的变化特点不尽一致。但总体表现为随着地下水位的抬升地下水矿化度不断下降的趋势。     

火灾工况建筑消防水池补水量的合理计算

在消防水池补水量的计算方面，设计人员通常采用假定进水管流速的方法来计算，这种计算方法显然缺乏理论依据，其计算所得结果必然影响消防给水系统的安全性、投资。文章通过理论推导方法探讨了补水量合理计算的问题，并推导出补水量的计算公式，简化了水力计算，既可减少消防水池容积。又可满足火灾时消防用水的需要。     

Case study research: training interdisciplinary engineers with context-dependent knowledge

It is now widely acknowledged that water management discipline is transforming, from being a public health and flood prevention challenge of the nineteenth century to a multi-dimensional challenge of water security for the twenty-first century. In order to train water engineers to be capable of working with this holistic multi-dimensional approach, a new paradigm in engineering education is required. Adjustments already made to undergraduate coursework are not enough; this new paradigm requires modifications to the PhD in engineering, with greater emphasis on interdisciplinary case study research. Such a change can deliver PhD graduates with both sufficient social and technical knowledge, who can then go on to become the hybrid lecturers crucially needed for training future water engineers.     

浅析农村小型水利工程施工质量控制

对县乡级小型水利工程施工中质量控制存在的问题进行了分析,对小型水利工程施工质量控制方法做了探讨。