陡坡富水斜井仰拱施工技术

大相岭泥巴山隧道2#通风斜井左线全长909.38 m、倾角17°29′19″(坡度31.5%),右洞斜井912.7 m、倾角16°41′12″(坡度30%),采用有轨运输系统,地质情况复杂,日涌水量达27 000 m3/d。文章介绍了长大陡坡富水斜井仰拱施工技术,采用先浇筑仰拱两侧墙角处边墙混凝土,完善了排水系统,保护了拱脚,使得仰拱能够全幅一次浇筑,确保了混凝土质量,并使结构安全稳定及工程稳步推进,加快了施工进度,颇值类似工程借鉴。     

饱和过湿土含水量控制的室内模型试验

为探讨降低潮湿多雨地区饱和过湿土含水量的方法及效果,通过室内模型试验,对真空预压排水法和电渗排水法的降水效果进行了对比分析.试验结果表明:2种方法都能有效降低饱和过湿土的含水量,达到排水固结效果,但土样中含水量降低程度的空间分布都存在不均匀性;采用真空预压法时,上下各层的含水量变化不大,固结效果相对较均匀.     

中小型集装箱物流场站设备选型

以中小型集装箱物流场站为设计模型,分析跨运车、正面吊的适应性,以期找到此类型物流企业设备选型的一些共性特点.     

Use of GIS-Based Models for Integrating and Developing Marine Fish Cages within the Tourism Industry in Tenerife (Canary Islands)

Site selection is a key factor in any aquaculture operation, affecting both success and sustainability. Moreover, it can solve conflicts between different coastal activities, making a rational use of the coastal space. Geographical information systems (GIS) have become of increased significance for environmental planning and assessment mainly because of the need to compare a great number of spatially related data, and because it can be used to couple these spatial data with their attributes and overlay them. This study used GIS and related technology to build a spatial database using those criteria which were considered to have any influence in integrating marine fish-cage culture within the tourism industry in Tenerife. Criteria were grouped in three submodels (distance to beaches, nautical sports, and viewshed), which were combined to generate a final output showing the most suitable areas for cage culture development in coexistence with tourism. Most areas of the coastline of Tenerife were identified as being suitable (56%) or very suitable (46%), suggesting that marine cage aquaculture could be developed on the island in coexistence with the well-established tourism industry.     

Next generation mega container ports: implications of traffic composition on sea space demand

ABSTRACT

Demand for sea space brought about by increasing container-shipping traffic has important implications on how this space is managed and used. This is particularly important given the long-term nature, high-asset specificity, high- opportunity cost of investment, and significant economic impact of container port activity on a locality. The challenge is especially pressing for ports, which are facing constraints in seaside capacity where container traffic also has to co-exist with the needs of other types of ship traffic. This challenge is likely be multiplied for next generation container ports, which are expected to handle even larger traffic volumes. These ports are also likely to face competing sea space demands from other economic and social activities especially when they are concurrently major confluences of trade, logistics, and urban populations. This is the first research to investigate in detail the impact and importance of investigating sea space requirements from the perspective of cargo traffic composition and ship capacity. Results show that transshipment containers can generate much higher demand for sea space due to the higher volume of shipping capacity that accompanies such traffic. Sustainability issues and managerial and policy implications pertaining to the development of next generation container ports are provided.     

山区漫水桥梁水毁调查分析及重建设计

重点阐述在涞水县7.21灾后公路恢复重建中,对桥梁水毁状况的调查分析以及工程重建设计要点,可为相关工作提供借鉴。     

公路水毁问题及应对措施探讨

公路水毁现象作为一种常见的公路工程问题,直接关系着整个工程项目的质量及其安全。鉴于此,对公路水毁问题及其成因进行分析,并在此基础上提出一些建设性建议,可供相关施工参考。     

船用主机缸套水温度控制系统

该系统利用微机检测船用主机缸套冷却水进出机温度等参数,及时输出控制量给变频器,调节海水泵转速,使冷却水温度保持恒定。同时利用软硬件相结合的方法成功解决了船舶机舱中的干扰,特别是变频器的干扰。     

二级公路工程滞后性水土保持监测实施方法探讨

部分二级公路项目水土保持监测工作存在滞后性,给水土保持监测工作的开展带来不利影响。文章以邕宁至浦北二级公路工程(南宁段)为例,研究滞后的水土保持监测工作存在的问题,并提出了相应的解决方案,为二级公路项目滞后性水土保持监测工作提供方案借鉴。     

发动机水温传感器响应时间研究

响应时间是温度传感器的重要指标,特别是在温度变化较快的应用环境以及对温度变化敏感的场合显得格外重要。一般标准要求发动机水温传感器的响应时间为30s以内。随着对汽车节能、环保要求的提高,需要更精确地感知和控制发动机冷却液温度,因此,迫切需要大幅缩短传感器的响应时间。通过改变壳体材料、形状尺寸,改善导热介质材料、注入工艺等方法,可以将响应时间缩短至6s以内。