Adaptive output feedback control based on DRFNN for AUV

The tracking control problem of AUV in six degrees-of-freedom (DOF) is addressed in this paper. In general, the velocities of the vehicles are very difficult to be accurately measured, which causes full state feedback scheme to be not feasible. Hence, an adaptive output feedback controller based on dynamic recurrent fuzzy neural network (DRFNN) is proposed, in which the location information is only needed for controller design. The DRFNN is used to online estimate the dynamic uncertain nonlinear mapping. Compared to the conventional neural network, DRFNN can clearly improve the tracking performance of AUV due to its less inputs and stronger memory features. The restricting condition for the estimation of the external disturbances and network's approximation errors, which is often given in the existing literatures, is broken in this paper. The stability analysis is given by Lyapunov theorem. Simulations illustrate the effectiveness of the proposed control scheme.     

中国热带6种海参骨片的种类和形态研究

利用扫描电子显微镜对我国6种热带海参(蛇目白尼参、玉足海参、花刺参、梅花参、子安辐肛参和巨梅花参)背脊部骨片的组成和结构进行了观察。结果表明,蛇目白尼参骨片有3种类型的花纹样体和1种杆状体;玉足海参骨片有2种类型的桌形体和1种扣形体;花刺参骨片有2种类型的桌形体、1种C形体和1种花纹样体;梅花参骨片有4种类型的杆状体;子安辐肛参骨片有1种花纹样体;巨梅花参骨片有1种杆状体、1种拟桌形体和1种颗粒体。结果显示,与之前学者光镜下观察的结果存在差异,玉足海参桌形体底盘中央是单孔而非4孔;花刺参桌形体立柱之间没有横梁连接。并发现了新的骨片类型:蛇目白尼参Ⅲ型花纹样体和杆状体;玉足海参顶部周缘小孔桌形体;花刺参顶部5簇小齿桌形体;梅花参Ⅱ型、Ⅲ型、Ⅳ型杆状体。     

台风Mindulle变性再发展的特征及机理研究

对于2004年台风Mindulle登陆入海再发展进行研究分析。通过演变特征的分析,发现在台风北移时,冷空气入侵台风低层,台风经历一个变性再发展的过程,台风在高层一直保持暖心结构,并且在台风的西侧形成一个冷锋面结构,而在北侧为一个暖性锋面结构,使得暖空气被迫抬升,冷空气也逐渐包围了台风。冷平流与来自暖海面的暖平流交汇使得暖湿的海面对流加剧。同时高空急流入口处辐散区与台风低压的重合和西风槽的东移,对台风的维持和再发展起到了重要的作用。     

烟台套子湾八角深水港的开发研究

通过调查和比较，认为在我国渤海和北黄海南岸的套子湾八角海区是一个条件优越的深水港址，在阐述开发八角深水港的重要意义同时，根据城市布局规划和岸线及水域资源，参照国际港口未来发展趋势，结合我国对中、西部地区经济发展战略，对八角深水港的开发和布局进行了研究，为烟台市发展成为“现代化、国际型港口城市”，提出了港区未来建设的模式。     

大鹏湾夜光藻种群的季节变化和分布特征

于１９９０年３月－１９９２年６月对中国南海大鹏湾盐田附近海域的夜光藻种群动态及时空分布进行了综合调查，结果表明，夜光藻种群的出现期间一般为每年的１－６月，最早是１９９１年的１２月，娄量高峰期为３－５月，种群密度的波动极为显著；调查期间共发生８次赤潮，且都发生在３月初至５月初；大鹏湾夜光藻赤潮的发生特点是，赤潮的发生和消失突然，持续时间短，一般不超过３ｄ。     

不规则波远破波对直墙的作用

基于物模试验、理论推理、因次分析和工程实例验证等综合分析方法,就不规则波远破波对直墙作用力的计算方法进行了研究,用推荐的方法得到的结果与工程实例符合较好.     

青岛市地质资源环境承载能力评价关键技术与应用

通过了解青岛市地质资源分布特征和区域地质环境条件,从地质资源和地质环境2个方面科学合理选取评价因子,建立评价指标体系,开展青岛市地质资源环境承载能力评价。评价结果显示,青岛市地质资源相对较匮乏,地质资源环境承载能力整体以强和较强为主,地质资源环境承载能力较弱的地区主要分布在环胶州湾地区、东部崂山山区及西海岸新区的西南部,地质资源环境承载能力弱的地区主要分布在李沧区以北及周边。分别从生产生活空间、农业生产空间及生态环境空间等方面提出了青岛市地质资源环境优化配置建议,为青岛市地质资源合理利用与地质环境安全保障提供科学依据。评价结果能够为区域国土空间规划提供建议。     

Ultimate strength assessment of hull structural plate with pitting corrosion damnification under biaxial compression

It is well known that pitting corrosion occurring on surface of hull structural plate will surely result in a significant degradation of the ultimate strength of the hull structural plate. This report aims at development of an assessing formula for ultimate strength of hull plate with pitting corrosion damage under the biaxial in-plane compression loading. The ultimate strength assessment model that is in terms of the corroded volume loss was deduced in theory, and which was then completed through numerical experiment by employing nonlinear finite element analyses for series of corroded plate models. Meanwhile, pitting corrosion in actual ship hull was analyzed and simulated, which ensured that all the assumptions for the finite element model parameters were in accord with the actual hull plate with pitting corrosion damage. Furthermore, the effects of plate slenderness, the linear factors at the plate edges and the ratio between the transverse and the longitudinal in-plane stresses on the ultimate strength reduction related to the corroded volume loss were discussed. The ultimate strength assessment formula being in terms of corroded volume loss developed in this research is expected to be applicable to assess the ultimate strength of the hull structural plate with pitting corrosion damage.     

厦门沿岸海域2种虾虎鱼染色体核型的比较

采用鱼鳍细胞空气干燥法制片,Giemsa染色,对厦门沿岸海域2种虾虎鱼的染色体核型进行了分析研究.其中,犬牙缰虾虎鱼（Amoya caninus）的染色体数目为2n=50,臂数为NF=84,有8对中部着丝点染色体（M）,7对亚中部着丝点染色体（SM）,2对亚端部着丝点染色体（ST）和8对端部着丝点染色体（T）.髭缟虾虎鱼（Tridentiger barbatus）的染色体数目为2n=44,臂数为NF=68,有5对中部着丝点染色体（M）,6对亚中部着丝点染色体（SM）,1对亚端部着丝点染色体（ST）和10对端部着丝点染色体（T）.未发现有异形染色体.其中犬牙缰虾虎鱼的染色体数目是文献中尚未报道的1类虾虎鱼染色体类型.