压气机级间喷水燃气轮机循环分析

该文给出压气机组间喷水燃气轮机数学模型,并据此模型计算出压气机的出口温度、压缩功、涡轮进口温度、循环效率及输出功率随喷水量变化关系。分析了大气温度、压比及涡轮进口温度变化时的压气机级间喷水燃气轮机的性能变化规律,讨论了在压气机不同位置喷水对燃气轮机比功和循环效率等性能的影响。     

盾构空推拼管片过矿山法隧道渗漏水控制

文章通过深圳地铁2号线2222标侨-香区间盾构空推拼管片过矿山法隧道段的施工,从空推拼管片渗漏水机理分析入手,分析其渗漏水的控制难点,有针对性地提出了解决办法。在施工实践中,本标段的渗漏水点、堵漏次数均得到有效地控制,收到了良好的效果。     

地铁车站主体结构渗漏水控制

在深圳地铁2号线侨香站施工中,采取基坑结构渗漏水处理、全包柔性防水层防水、混凝土主体结构施工控制、施工缝和变形缝渗漏水处理等相应措施对地铁车站结构渗漏水进行了控制和防护,取得了良好的防水效果。     

淮安水利枢纽通航渡槽船舶航行三维数模分析

淮安水利枢纽二期工程需要增建渡槽,与一期渡槽形成长距离通航渡槽后可能对通航条件造成影响.针对这一问题,建立了三维数学模型,选择最不利船型组合情况下的两种工况,模拟分析二期渡槽建设前后的渡槽通航条件,即上下行船舶对开工况、是否布置消能格栅工况.得出结论:1)在不布置消能格栅的情况下二期渡槽建成后波高增加约20％,在增加消...     

苏南地区小流域防洪治涝规划研究——以胜利河流域为例

文章梳理了胜利河流域[1]现状防洪治涝工程基本情况,通过文献查阅、实地勘察和调查走访等方式,分析现状流域防洪治涝调度体系存在问题,论证防洪治涝规划标准,统筹考虑防洪工程建设“蓄泄兼筹”的治理原则,提出了与流域实际情况相结合的规划方案,为苏南地区小流域防洪治涝规划提供借鉴与参考。     

岫水公路改扩建工程中的水土保持措施

根据公路改扩建工程建设中涉及的水土保持问题,阐述了水土保持的原则,提出了解决水土保持与公路建设矛盾统一体的技术措施与方案。     

船舶航行图像信息记录的研究

介绍船舶航行图像信息记录的系统构成、航行图像信息记录基本思路和图像信息编码原理及压缩方法。     

洋山深水港区二期水工码头大口径嵌岩桩施工工艺

介绍了洋山深水港区二期水工码头大口径嵌岩桩的主要施工工艺及控制要求。阐述了其施工难点及处理措施,并对桩身质量检测项目和结果作一叙述。最后指出:要确保钻孔嵌岩桩的施工质量,其关键在于有效管理,施工人员的高度责任心,以防为主,精心施工。     

Formation of Denmark Strait overflow water and its hydro-chemical composition

The dense overflow across the Denmark Strait is investigated with hydrographic and hydro-chemical data and the water mass composition of the Denmark Strait Overflow Water (DSOW) is determined by multivariate analysis. Hydrographical properties, the transient tracers CFC-11 and CFC-12, oxygen and nutrients are utilized for the water mass definitions. Distribution and characteristics of water masses north of Denmark Strait are described, the important water masses at the sill and the variability on weekly time-scales are discussed, and the entrainment and mixing of water into the overflow plume in the northern Irminger Basin is calculated. The analysis indicates that water masses both from the Nordic Seas and the Arctic Ocean are important for the formation of DSOW. It is found that water masses transported with the East Greenland Current make up about 75% of the overflow at the sill. The overflow at, and shortly south of, the sill is inhomogeneous with a low-salinity component dominated by Polar Intermediate Water. The high-salinity component of the overflow is mainly of Arctic origin. The water mass composition, and the short-term variability for 7 repeats of sections close to the sill are described, and these illustrate that the overflow is in fact a composite of a number of water masses with different formation and transport histories. This indicate that the overflow is a robust feature, but that it responds to variations in the circulation or atmospheric forcing that influences the formation of intermediate and deep water masses within the Arctic Mediterranean and the North Atlantic. At a section about 400 km south of the sill the overflow is well mixed and modified by entrainment of, mainly, Iceland–Scotland Overflow Water and Labrador Sea Water, together constituting 30% of the overflow plume. The entrainment of Middle Irminger Water dominates shortly downstream of the sill, before the overflow plume reaches too deep but the entrainment seems to be intermittent in time.     

吴淞口水质浓度与上海地区长江水系船舶货运量关系的实证研究

采用协整分析技术和Granger因果关系检验方法,对1994～2003年上海地区长江水系货运量与吴淞口水质浓度进行了实证分析。研究结果表明,长江水系货运量与吴淞口水质浓度不存在长期的均衡关系,但同时也发现货运量与水质浓度之间存在着一定的因果关系,长江水系船舶货运量直接影响着吴淞口水质浓度。