Assessing the sustainability of non-renewable brackish groundwater in feeding an RO desalination plant in Bahrain

The Rus-Umm Er Radhuma aquifer in Bahrain is a non-renewable source of brackish water (8-15 g/L), which forms a lens underlain everywhere with brines of over 100 g/L. Aquifer utilization has started in 1984 to feed a reverse osmosis (RO) desalination plant, with an economic life of 25 years (2010). Future plant upgrade strategy is formulated around boosting the plant production, which will require increasing the we llfield abstraction, in addition to a possible future rehabilitation program to extend the plant life by another 15 years (2025). The limiting factor in expanding the RO plant and its rehabilitation is the future feed water salinity, which have to be assessed before any investments are made to expand the RO plant and commission additional abstraction wells and implement the rehabilitation program. The aquifer management is based on mining a one-time brackish water reserve stored in the aquifer, the main management objective is stated as to sustain the aquifer future availability in feeding the desalination plant with a specified salinity limit of 20 g/L over the economic life of the plant of 25 years (1985-2010), and also over the plant extension period by rehabilitation (2010-2025). The stochastic analysis methodology utilizing conditional simulation is applied to conduct a risk assessment of violating these two pre-specified sustainability constraints under the proposed abstraction increase; and provided a tool to aid the decision-making process in the development and management of the aquifer under large uncertainties. Simulation results indicated that the risk of having the salinity of the wellfi eld produced water to increase due to the proposed increase in the wellfield abstraction to reach 20 g/L over the economic life of the plant (2010) is very small and minimal. However, it is questionable that the feed water salinity will be maintained under the proposed rehabilitation program to extend the plant economic life by another 15 years (2011-2025). For this option, it is recommended that model post-auditing be performed, and new updated predictions should be made as more data of potentiometry. salinity. and hydraulic parameters become available.     

柔性标签弯曲及对RFID系统识读距离的影响研究

针对平面结构标签在使用过程中经常发生弯曲形变的问题,研究一种柔性标签发生圆弧形弯曲和垂直折叠形变时天线性能的变化以及对RFID系统识读距离的影响。介绍柔性标签天线的研究现状,分析影响RFID系统识读距离的关键因素,通过示意图阐述弯曲天线模型的建模方法,基于HFSS仿真分析阻抗、增益和辐射效率等的变化规律。通过实际测量验证了RFID系统识读距离的仿真结果及该方法的可行性。     

基于PLC的船舶机舱监测报警系统的改进方案

针对原机舱监测报警系统的老化以及无法表示监测点的具体数值的问题,利用西门子PLC S7-200作为数据的采集和发送单元,利用西门子触摸屏MP377搭载组态软件WinCC flexible 2010,对数据进行实时的监测与报警,同时PLC将机舱监测报警系统所有测点的实时数据发送到轮机长室,实现对机舱主机及付机的各项参数的实时监测。改进的监测系统已经投入使用,事实证明该系统安全可靠。     

参数优化配置的广义奇异摄动弹性飞机模型降阶研究

推导了广义奇异摄动法的降阶方法,介绍了其在飞机模型降阶应用中的优点,针对算法中出现的参数ξ进行了分析,以弹性飞机模型为平台提出了ξ的优化配置并进行了仿真。结果表明,采用该参数配置的广义奇异摄动模型降阶方法可以用于弹性飞机模型降阶。     

基于有限元方法的3-PPSR大长径比柔性并联机器人刚度模型分析

为实现较大工作空间的运动,设计了一种大长径比的3-PPSR结构的微操作柔性并联机器人.该机器人由压电马达驱动,采用大长径比柔性铰链连接,柔性铰链的变形范围在毫米级,适用于要求大变形的场合,同时具有结构简单、无奇异、无间隙、运动精度高等特点.由于系统的刚度直接影响系统的运动精度、承载负荷等性能,针对大长径比柔性铰链特点,运用有限元方法,建立了柔性铰链的数学模型,并采用整体刚度的方法,结合机构协调方程和力平衡方程,得到系统的柔性刚度模型.最后,采用ANSYS比较了所建理论刚度模型结果与有限元模型分析的结果.分析结果表明,理论刚度模型合理,符合机构的运动特征.     

海洋非黏结柔性管道接头密封结构分析

介绍海洋非黏结柔性管道接头的常见密封结构,用Abaqus对接头的密封特性进行数值分析,研究密封圈的密封性能对不同密封结构参数的灵敏度,得到密封结构参数变化对接头密封结构的密封性能和力学性能影响的一般规律.结果表明密封结构的主要设计参数为密封圈的锥角和曲率半径以及加载位移等.     

聚氨酯软泡压陷性能的测试

介绍了软质聚氨酯泡沫塑料压陷性能的测试标准，不同厚度样品的压陷硬度测试值的差异，采用50%压缩负荷估计压陷硬度的简易测试方法，以及压陷性能测试的影响因素，并对测试聚氨酯软泡压陷性能的国家标准与国外标准的差别进行了比较。     

TRANSIENT ANALYSIS OF CRYSTALLIZATION: EFFECT OF THE SIZE DEPENDENT GROWTH RATE

The dynamics of the crystal size distribution in a continuous mixed suspension, mixed product removal crystallizer is modeled stochastically. The model is fairly general in that it involves a size-dependent growth rate function: this size-dependent growth rate as a possible cause of deviation on the behavior of the crystallizer from that of an idealized or simplified counterpart has been investigated based upon the model.     

柔性管设计中允许竖向变形的合理取值

本文分析了地下埋设的柔性管的竖向变形与管壁弯曲性能的关系，讨论了几类不同材质管道承受一定的工作压力时它们的竖向变形的合理取值。