雷达模拟视频和电子海图图像叠加方法

雷达和电子海图是船舶重要助航设备。为了提高船舶航行中的避碰能力,文章提出了一种雷达模拟视频和电子海图图像叠加方法。采集雷达的模拟视频信号、方位信号和触发脉冲,通过A/D转换,利用极坐标与直角坐标变换模型和图像匹配模型,实现雷达和电子海图图像的叠加。试验结果表明,雷达和电子海图图像叠加是辅助船舶安全航行的有效方法,电子海图的海岸轮廓和雷达扫描到的图像能够较好的匹配融合,可以在电子海图底图上实时显示雷达捕获到的目标,提高对船舶周围环境的监控能力。     

复发性口疮与细胞介导性免疫疾病的对照研究

采用单克隆抗体、间接致敏红细胞花环试验法对复发性口疮（Ｒｅｃｕｒｒｅｎｔａｐｈｔｈｏｕｓ ｕｌｃｅｒ,ＲＡＵ）、胃癌及系统性红斑狼疮（Ｓｙｓｔｅｍ ｉｃ ｌｕｐｕｓ ｅｒｙｔｈｅｍ ａｔｏｓｕｓ,ＳＬＥ）患者外周血ＷｕＴ３、ＷｕＴ４、ＷｕＴ８ 及Ｔ４／Ｔ８ 比值进行检测。结果：胃癌患者ＷｕＴ３、ＷｕＴ４ 低于对照组（ Ｐ＜ ０．０５）,ＷｕＴ８ 高于对照组,Ｔ４／Ｔ８ 比值明显低于对照组（ Ｐ＜ ０．００１）。ＳＬＥ组患者ＷｕＴ８ 较对照组低下,Ｔ４／Ｔ８ 比值增高（ Ｐ＜ ０．０５）。ＲＡＵ组患者ＷｕＴ３ 低于对照组,ＷｕＴ８ 高于对照组,Ｔ４／Ｔ８ 比值下降（ Ｐ＜ ０．０５）。认为：①胃癌的发生是机体总的细胞免疫处于低下无能状态,不能对肿瘤进行正常的免疫监视及免疫应答。②ＳＬＥ的发病与ＷｕＴ８ 功能降低有关,其导致自身反应细胞发生脱抑制而功能亢进。③ＲＡＵ 的发生是因ＷｕＴ８ 细胞功能增强,致使Ｔｃ细胞的作用增强,其直接攻击粘膜靶细胞造成粘膜坏死、溃疡     

税收政策对新能源汽车企业发展的影响研究

现如今,国家提倡环保,各行各业为寻求新型的发展之路都做出了相关的改进.针对汽车行业而言,有必要研发新能源汽车,唯有促进技术创新,才能令新能源汽车产业获得更好地发展,这也是当前汽车产业发展的主要方向.站在政府的角度,为了激励企业展开研发投入,通常会采取税收优惠政策,推出有利的扶持政策,比如税收优惠政策,以便新能源汽车企业...     

S.M.W支护结构的大变形数值分析

针对可回收的Ｓ．Ｍ．Ｗ支护结构,文中基于Ｔ．Ｌ坐标,建立了初始构形的大变形增量有限元方程。引入自修正选代算法,用编制ＦＬＳＡＣ大变形程序,对Ｓ．Ｍ．Ｗ支护结构的受力和变形特征进行了分析。为支护结构设计和选取支护结构参数提供了依据。     

海洋平台新型配电网络研究

本文结合现有海洋平台电力分配系统,提出了一种环形配电网络与直流配电技术相结合的新型配电网络,并分析这种新型配电网络的优点和关键技术。     

Experimental study on hydrodynamics of L-type podded propulsor in straight-ahead motion and off-design conditions

Experimental tests were conducted to evaluate the hydrodynamic performance of an L-type podded propulsor in straight-ahead motion and off-design conditions using an open-water measuring instrument developed by the authors for podded propulsors, a ship model towing tank, and under water particle image velocimetry (PIV) measurement systems. Under the three types of conditions, the main parameters of an L-type podded propulsor were measured, including the propeller thrust and torque, as well as the thrust, side force, and moment of the whole pod unit. In addition, the flow field on the section between the propeller and the strut was analyzed. Experimental results demonstrate that the dynamic azimuthing rate and direction and the turning direction affect the forces on the propeller and the whole pod unit. Forces are asymmetrically distributed between the left and right azimuthing directions because of the effect of propeller rotation. The findings of this study provide a foundation for further research on L-type podded propulsors.     

Numerical analysis of the soil compaction degree under multi-location tamping

Dynamic compaction (DC) is an efficient soil improvement technique. The previous numerical studies mainly focus on the soil response of single location tamping, but ignore the soil compaction degree under multilocation tamping. In this study, a numerical investigation of multi-location tamping in granular soils is carried out using three-dimensional (3D) finite element model (FEM). The behaviors of the granular soils are described by means of the viscoplastic cap model. The constitutive relationship of the soils is implemented into LS-DYNA and is integrated with 3D FEM for numerical investigation. Then utilizing the field data from the previous studies, we investigate the soil compaction degree at different stages by a case of two basic patterns, and discuss the cause of soil response. Lastly, we evaluate the effect of construction parameters on soil compaction. The simulation results show that the previous tamping affects the soil compaction degree beneath the adjacent tamping location, and the effect is greater near the side of previous location. Meanwhile, the soil compaction degree around the existing tamping crater weakens due to the adjacent tamping. Moreover, the rational selection of DC construction parameters can improve the soil compaction degree, and some hints on the effect of soil compaction are given.     

高速公路路基过湿土处理的探讨

从理论和实践方面分析了过湿土对高速公路路基施工的影响,介绍过湿土的处理措施及施工要点。     

评价方法对土体边坡稳定分析的影响

介绍了非饱和土体的抗剪强度理论及土水特征曲线，建立了非饱和土体边坡稳定性分析的线性评价和非线性评价两种模型。通过计算，对其计算结果进行了比较，总结了两种评价方法对土体边坡稳定性分析的影响。     

某高速公路土包砂路基施工的体会

众某高速公路土包砂路基的施工实际出发，郑重说明了施工中存在的薄弱环节，并根据施工中取得的经验提出了改进办法及质量控制手段，为今后的施工提供参考。