Analysis of epimetamorphic rock slopes using soft computing

This article adopts three soft computing techniques including support vector machine （SVM）, least square support vector machine （LSSVM） and relevance vector machine （RVM） for prediction of status of epimetemorphic rock slope. The input variables of SVM, LSSVM and RVM are bulk density, height, inclination, cohesion and internal friction angle. There are 53 datasets which have been used to develop the SVM, LSSVM and RVM models. The developed SVM, LSSVM and RVM give equations for prediction of status of epimetemorphic rock slope. The performance of SVM, LSSVM and RVM is 100%. A comparative study has been presented between the developed SVM, LSSVM and RVM. The results confirm that the developed SVM, LSSVM and RVM are effective tools for prediction of status of epimetemorphic rock slope.     

Real-Time MRI-Controlled Ultrasound Hyperthermia System for Superficial Tumor Treatment

Ultrasound hyperthermia is one of the most important methods in tumor treatment and characterized by non-invasiveness. Magnetic resonance imaging（MRI）-based temperature mapping techniques are safe compared with invasive methods and have been applied to detect temperature changes for a variety of applications. Among these techniques, the proton resonance frequency（PRF） method is relatively advanced. With a temperature measuring experiment, the effectiveness of PRF method has been proved, because the outcome temperature curve and the real temperature curve fit well. After that, an experiment has been conducted on tumors inside rabbit legs and the result indicates that this system is able to performance hyperthermia at targets based on PRF method in temperature mapping.     

天文三角形解算方法比较

使用“电子海图显示与信息系统（简称ECDIS）”解算天文三角形不仅能提高天文航海计算的速度和精度,而且还可以帮助驾驶员更好地理解天体天球坐标和天体地理坐标的关系;同时使用ECDIS解算天文三角形也符合STCW公约马尼拉修正案中提倡使用天文航海计算软件的建议.本文旨在探讨使用ECDIS解算天文三角形的方法.     

膨胀土（岩）地区常见铁路路基病害及整治研究

膨胀土（岩）因含较多的亲水矿物,在干湿循环条件下的胀缩特性易引发各种病害。以某铁路为例,分析膨胀土（岩）路基病害的主要表现形式及形成机理,有针对性地提出技术可行、经济合理的路基病害整治措施。膨胀土（岩）地区路基工点常见病害有基床下沉和翻浆冒泥,边坡冲蚀、溜坍和滑坡等。路基病害整治应分别从基床整治、边坡防护加固和防排水等方面综合考虑。     

基于CFD不同AUV艇体阻力性能研究

为了研究不同类型AUV艇体阻力性能特点以及十字舵和整流罩附体对总阻力的影响,在充分研究4种艇型型线的基础上,建立几何模型,选取标准k-ε,RNG k-ε,SST k-ω湍流模式,通过CFD对艇体进行阻力数值模拟。结果表明,十字舵引起的艇体阻力增加比例大约在10%~20%,且随着展弦比的增加而呈减小趋势,直径与艇体最大直径相当的整流罩引起的艇体阻力增加比例大约在40%~50%;流线型BLUEFIN阻力增加值随航速变化较大,而钝性BLUEFIN阻力增加值几乎不受航速的影响,AUTOSUB型AUV阻力性能最优,AUTOSUB和HUGIN适合中高速航行,REMUS和BLUEFIN适合低速航行。     

基于S-Lay的水下在线管汇安装方法

结合南海某深水项目和S-Lay铺设方法以及OrcaFlex软件模拟结果,论述在线管汇安装技术及安装程序,讨论水下在线管汇安装施工时的注意事项。     

Calculation of the Added Mass of a Liquid Tank＇s Bulkheads

The added mass coefficient and the water level indexformulas for the same-phase and anti-phase vibration of rectangularliquid tanks＇ bulkheads were derived based on dry mode theory.Three fluid-structure interaction numerical methods including FluidFEM and Fluid BEM were used in this case. The comparison ofnumerical and theoretical results by the present method shows thatANSYS/FluidS0 is more credible, the NASTRAN/Virtual MassMethod is more suitable for engineering calculations and results ofthe same-phase vibration by the present method is more accurate.     

基于亮点迹线跟踪的逆合成孔径成像运动补偿技术

本文提出一种基于亮点迹线跟踪的逆合成孔径声呐运动补偿技术。该方法从匹配滤波后的多脉冲回波历程图上,对距离变化区间较小的亮点进行轨迹跟踪,得到亮点距离随时间的变化,估算出目标质心到基阵的漂移运动量,并进行补偿。仿真试验结果表明,所提方法能有效提高逆合成孔径声呐的成像性能。     

多波束声呐声学参数校准系统设计

依据水声计量测试原理与方法,设计了一套多波束声呐声学关键参数的计量校准系统。利用多维运行控制装置,在消声水池中对多波束声呐进行了声源级、工作频率、波束宽度、脉冲宽度等声学指标的校准。阐述了校准系统的主要组成、计量器具控制和校准方法。实现了在等效自由场、远场中对水下声呐换能器位置的精确控制、声信号采集与分析等功能。通过不确定度评定,给出了该校准系统工作频率、波束宽度测量结果的扩展不确定度。通过参考值与标称值比对,求得被检多波束声呐声源级误差小于0.7 dB,工作频率误差小于0.03%,脉宽误差小于2%,波束宽度误差小于10%。     

广州港南沙四期工程轨道地基处理

广州港南沙港区四期工程采用自动化轨道式龙门起重机（ARMG），ARMG对地基基础的要求较高。由于原状软土厚度较大，大面积真空预压处理的地基不能满足使用要求，需要对轨道地基进行二次处理。结合工程地质条件和ARMG使用要求，通过方案比选，采用水泥搅拌桩复合地基对轨道进行二次地基处理。堆场区轨道基础采用钢筋混凝土地基梁结构+水泥搅拌桩复合地基，过路段轨道基础采用钢筋混凝土轨道板结构+水泥搅拌桩复合地基。钢筋混凝土地基梁+水泥搅拌桩复合地基方案可以满足轨道的使用要求，造价较低、过路段差异沉降较小。