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气候变化检测与诊断技术的若干新进展 被引量:58
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作者 封国林 龚志强 支蓉 《气象学报》 CAS CSCD 北大核心 2008年第6期892-905,共14页
近年来,全球气候变暖及其对世界经济的影响已经引起了社会各界的关注和重视,判断当前全球的温度变化趋势,已经成为研究气候变化的一个至关重要的问题。进一步发展新的气候变化检测技术以适应全球增暖的新特征则显得尤为重要。因此,结合... 近年来,全球气候变暖及其对世界经济的影响已经引起了社会各界的关注和重视,判断当前全球的温度变化趋势,已经成为研究气候变化的一个至关重要的问题。进一步发展新的气候变化检测技术以适应全球增暖的新特征则显得尤为重要。因此,结合(1)气候突变和转折检测技术、(2)观测数据信息的分离和提取、(3)气候系统内在复杂性、(4)气候系统动力学结构特征的识别、(5)极端气候事件定义及其检测等方面的气候变化检测技术研究,分别介绍了中国近期气候变化检测技术的研究进展及部分研究成果,主要侧重于新检测技术和方法的介绍。最后,就当前气候变化检测技术方面的一些焦点和难点问题做了简单的讨论。 展开更多
关键词 气候突变 极端气候事件 检测 动力学结构特征
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Hydrodynamic Characteristics of Three Rows of Vertical Slotted Wall Breakwaters 被引量:5
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作者 Majed O. Alsaydalani Mohammed A. N. Saif Medhat M. Helal 《Journal of Marine Science and Application》 CSCD 2017年第3期261-275,共15页
In this study, we examine the hydrodynamic characteristics of three rows of vertical slotted wall breakwaters in which the front and middle walls are permeable and partially immersed in a water channel of constant dep... In this study, we examine the hydrodynamic characteristics of three rows of vertical slotted wall breakwaters in which the front and middle walls are permeable and partially immersed in a water channel of constant depth, whereas the third wall is impermeable. The wave–structure interaction and flow behavior of this type of breakwater arrangement are complicated and must be analyzed before breakwaters can be appropriately designed. To study the hydrodynamic breakwater performance, we developed a mathematical model based on the eigenfunction expansion method and a least squares technique for predicting wave interaction with three rows of vertical slotted wall breakwaters. We theoretically examined the wave transmission, reflection, energy loss, wave runup, and wave force under normal regular waves. Comparisons with experimental measurements show that the mathematical model results adequately reproduce most of the important features. The results of this investigation provide a better understanding of the hydrodynamic performance of triple-row vertical slotted wall breakwaters. 展开更多
关键词 slotted breakwaters mathematical models transmission coefficient reflection coefficient energy-loss coefficient wave runup wave force
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Dynamic characteristics of a WPC-comparison of transfer matrix method and FE method
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作者 CHEN Guo-long and ME Wu School of Shipbuilding Engineering , Harbin Engineering University, Harbin 150001 , China 《Journal of Marine Science and Application》 2003年第2期25-30,共6页
To find the difference in dynamic characteristics between conventional monohull ship and wave penetrating catamaran (WPC), a WPC was taken as an object; its dynamic characteristics were computed by transfer matrix met... To find the difference in dynamic characteristics between conventional monohull ship and wave penetrating catamaran (WPC), a WPC was taken as an object; its dynamic characteristics were computed by transfer matrix method and finite element method respectively. According to the comparison of the nature frequency results and mode shape results, the fact that FEM method is more suitable to dynamic characteristics analysis of a WPC was pointed out, special features on dynamic characteristics of WPC were given, and some beneficial suggestions are proposed to optimize the strength of a WPC in design period. 展开更多
关键词 Wave penetrating catamaran Dynamic characteristics Transfer matrix method FEM.
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Kinematic modeling and analysis of novel eight-wheel lunar rover
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作者 高海波 张朋 +1 位作者 邓宗全 胡明 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第6期751-755,共5页
A new kind of eight-wheel lunar rover is developed, which is a complex closed-chain system and has good capabilities of climbing slope, surmounting obstacles and adapting to uneven terrain. In this paper, the mechanic... A new kind of eight-wheel lunar rover is developed, which is a complex closed-chain system and has good capabilities of climbing slope, surmounting obstacles and adapting to uneven terrain. In this paper, the mechanical structure of the novel eight-wheel lunar rover is introduced, forward and inverse kinematic models of the rover are established according to the closed-chain coordinate transformation and instantaneous coincidence coordinate. Based on structural characteristics, its kinetic characteristics are analyzed. Wheel slippages are separated and calculated, and a method for closed-loop control modification using wheel slip estimation during the model establishment is proposed. The results can be applied to the motion control of lunar rover. 展开更多
关键词 kinematic modeling locomotion system eight-wheel lunar rover lunar rover
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