State- and output-feedback robust path-following controllers for underactuated ships using Serret–Frenet frame

This paper develops state- and output-feedback controllers that force an underactuated surface ship to follow a predefined path at a constant forward speed controlled by the main thruster system under the presence of environmental disturbances induced by wave, wind and ocean-current. The proposed controllers are designed using Lyapunov’s direct method and the popular backstepping. The unmeasured sway and yaw velocities are estimated by introducing a new nonlinear passive observer. A stability result for nonlinear cascade systems with nonvanishing uncertainties is introduced to analyze closed-loop stability. Numerical simulations using the real data of a monohull ship are provided to illustrate the effectiveness of the proposed methodology for path following of underactuated ships.     

Detection and assessment of cloud cover and precipitation parameters using data of scanning radiometers of polar–orbiting and geostationary meteorological satellites

Two multispectral threshold techniques have been developed and tested for the automatic classification of AVHRR/NOAA and SEVIRI/Meteosat-10 data. They provide day-and-night detection and the assessment of cloud-cover parameters, as well as the discrimination of precipitation zones and severe weather phenomena. The validation of output information products, which has been performed with ground-based conventional meteorological observations and radar data, as well as with independent satellite-based estimates of cloud cover and precipitation parameters, confirms the feasibility of developed techniques and reasonable accuracy of output products. Therefore, the technique is concurrent to those implemented in current foreign satellite centers.     

Interaction between two polar cold source and tropical ocean heat source effecting global climate change

Ｉｎｔｅｒａｃｔｉｏｎ　ｂｅｔｗｅｅｎ　ｔｗｏ　ｐｏｌａｒ　ｃｏｌｄ　ｓｏｕｒｃｅ　ａｎｄ　ｔｒｏｐｉｃａｌ　ｏｃｅａｎ　ｈｅａｔ　ｓｏｕｒｃｅ　ｅｆｆｅｃｔｉｎｇ　ｇｌｏｂａｌ　ｃｌｉｍａｔｅ　ｃｈａｎｇｅＸｉｅＳｉｍｅｉ，ＢａｏＣｈｅｎｇｌａｎａ...     

Interface phonon—polaritons in quantum well systems of polar ternary mixed crystals

The interface phonon--polaritons in quantum well systems consisting of polar ternary mixed crystals are investigated. The numerical results of the interface phonon--polariton frequencies in the GaAs/Al_xGa_{1 - x}As, ZnS_xSe_{1 - x}/ZnS, and Zn_xCd_{1 - x}Se/ ZnSe quantum well systems are obtained and discussed. It is shown that there are six branches of interface phonon--polariton modes distributed in three bulk phonon--polariton forbidden bands in the systems. The electric fields of interface phonon--polaritons are also presented and show the interface locality of the modes. The effects of the 'two-mode' and 'one-mode' behaviours of the ternary mixed crystals on the interface phonon--polariton modes are shown in the dispersion curves.     

A coming boom in commercial shipping? The potential for rapid growth of noise from commercial ships by 2030

Ocean noise levels are thought to be increasing as a result of major growth in global shipping activity, but data quantifying those changes are limited in space and time. As an alternative approach, this study examines the current and future maximum noise capacity of three segments of the global commercial shipping fleet: container ships, oil tankers, and bulk carriers. It shows that continued growth in the number of ships, the quantity of goods carried and the distances traveled could increase the maximum noise capacity of the global shipping fleet by up to a factor of 1.9 by 2030, with major growth in particular in the container and bulk carrier segments. Thus, in the absence of operational or manufacturing changes to such ships, the contribution of commercial shipping to ambient ocean noise levels can be expected to dramatically increase.     

Competition within the marine microalgae over the polar dark period in the Greenland Sea of high Arctic

Abstract-With the onset of winter, polar marine microalgae would have faced total darkness for aperiod of up to 6 months. A natural autumn community of Arctic sea ice microalgae was collected fordark survival experiments from the Greenland Sea during the ARKTIS-XI/2 Expedition of RV Po-larstern in October 1995. After a dark period of 161 days, species dominance in the algal assemblagehave changed from initially pennate diatoms to small phytoflagellates (<20μm). Over the entire darkperiod, the mean algal growth rate was-0.01 d~(-1). Nearly all diatom species had negative growthrates, while phytoflagellate abundance increased. Resting spore formation during the dark period was ob-served in less than 4.5% of all cells and only for dinoflagellates and the diatom Chaetoceros spp. We as-sume that facultative heterotrophy and energy storage are the main processes enabling survival during thedark Arctic winter. After an increase in light intensity, microalgal cells reacted with fast growth withindays. Phytoffa     

Aims and Scope

China Ocean Engineering takes as its prime function the integration of new research concepts, equipment, technology, materials and structures and other scientific advances within the field of ocean engineering, with particular reference to developments in China. Tne Journal is concerned with all engineering aspects involved in the exploration and utilization of ocean resources, such as offshore engineering, coastal engineering, dive and salvage, utilization of marine energy, resourees and underwater engineering.     

Aims and Scope

China Ocean Engineering takes as its prime function the integration of new research concepts,equipment,technology,materials and structures and other scientific advances within the field of ocean engineering,with particular reference to developments in Chi…     

Aims and Scope

Being an intcrnational journal,China Ocean Engineering takes as its prime function the integration of new researchconcepts,equipment,technology,materials and structures and other scientific advances within the field of     

Aims and Scope

正China Ocean Engineering takes as its prime function the integration of new research concepts, equipment, technology, materials and structures and other scientific advances within the field of ocean engineering, with particular reference to     

Aims and Scope

China Ocean Engineering takes as its prime function the integration of new research concepts,equipment,technology,materials and structures and other scientific advances within the field of ocean engineering,with particular reference to developments in Chi     

Aims and Scope

正Being an international journal,China Ocean Engineering takes as its prime function the integration of new research concepts,equipment,technology,materials and structures and other scientific advances within the field of estuarial,coastal,offshore,and deepwater engineering with particular reference to developments.The Journal is concerned with all engineering aspects involved in the exploration and utilization of ocean resources.Topics regularly covered include research,design and     

Aims and Scope

China Ocean Engineering takes as its prime function the integration of new research concepts,equipment,technology,materials and structures and other scientific advances within the field of ocean engineering, with particular reference to developments in China.     

Aims and Scope

由中国海洋工程学会主办,南京水利科学研究院承办,大连理工大学海岸和近海工程国家重点实验室协办的第十二届中国海岸工程学术讨论会于2005年10月16-19日在云南省昆明市召开。邱大洪名誉理事长、谢世楞、严以新、李润培、李京武、左其华等副理事长出席了会议。全国从事海洋工程研究包括高等院校、设计、科研、建设和施工等39个部门的近百名代表参加了学术交流。17日上午,严以新副理事长主持了开幕式,并致开幕词;窦希萍副秘书长作了学会近两年来的工作总结。严以新和左其华教授分别主持了大会主题报告。中国科学院院士邱大洪教授论述了沿海海…     

Aims and Scope

China Ocean Engineering takes as its prime function the integration of new research concepts, equipment, technology, materials and structures and other scientific advances within the field of ocean engineering, with particular reference to developments in     

Aims and Scope

China Ocean Engineering takes as its prime function the integration of new research concepts, equipment, technology, materials and structures and other scientific advances within the field of ocean engineering, with particular reference to developments in China. The Journal is concerned with all engineering aspects involved in the exploration and utilization of ocean resources, such as offshore engineering, coastal engineering, dive and salvage, utilization of marine energy resources and underwater engineering.[第一段]