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Application of Boundary Collocation Method to Two-Dimensional Wave Propagation

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China Ocean Engineering 2015年第4期29卷 579-587页

作者：曹雪玲游亚戈盛松伟彭雯叶寅 Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Key Laboratory of Renewable Energy and Gas Hydrate Chinese Academy of Sciences University of Chinese Academy of Sciences

Boundary Collocation Method （BCM） based on Eigenfunction Expansion Method （EEM）, a new numerical method for solving two-dimensional wave problems, is developed. To verify the method, wave problems on a series of beaches with different geometries are solved, and the errors of the method are analyzed. The calculation firmly confirms that the results will be more precise if we choose more rational points on the beach. The application of BCM, available for the problems with irregular domains and arbitrary boundary conditions, can effectively avoid complex calculation and programming. It can be widely used in ocean engineering.

关键词： boundary collocation method eigenfunction expansion method wave propagation beach

Research on Energy Conversion System of Floating Wave Energy Converter

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China Ocean Engineering 2014年第1期28卷 105-113页

作者：张亚群盛松伟游亚戈吴必军刘洋 Guangzhou Institute of Energy Conversion Chinese Academy of Sciences Key Laboratory of Renewable Energy and Gas Hydrate Chinese Academy Sciences Graduate College Chinese Academy of Sciences

A wave power device includes an energy harvesting system and a power take-off system. The power take-off system of a floating wave energy device is the key that converts wave energy into other forms. A set of hydraulic power take-off system, which suits for the floating wave energy devices, includes hydraulic system and power generation system. The hydraulic control system uses a special“self-hydraulic control system”to control hydraulic system to release or save energy under the maximum and the minimum pressures. The maximum pressure is enhanced to 23 MPa, the minimum to 9 MPa. Quite a few experiments show that the recent hydraulic system is evidently improved in efficiency and reliability than our previous one, that is expected to be great significant in the research and development of our prototype about wave energy conversion.

关键词： hydraulic power take-off system (PTO) second transfers conversion efficiency hydraulic control

Passive activity enhances residual control ability in patients with complete spinal cord injury

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Neural Regeneration Research 2025年第8期20卷 2337-2347页

作者： Yanqing Xiao Mingming Gao Zejia He Jia Zheng Hongming Bai Jia-sheng Rao Guiyun song wei song Xiaoguang Li Beijing Key Laboratory for Biomaterials and Neural Regeneration Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijingChina Department of Rehabilitation Evaluation China Rehabilitation Research CenterBeijingChina Cardiac Center Beijing Children’s HospitalCapital Medical UniversityBeijingChina The State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijingChina Department of Rehabilitation Engineering China Rehabilitation Science InstituteBeijingChina

Patients with complete spinal cord injury retain the potential for volitional muscle activity in muscles located below the spinal injury ***,because of prolonged inactivity,initial attempts to activate these muscles may not effectively engage any of the remaining neurons in the descending pathway.A previous study unexpectedly found that a brief clinical round of passive activity significantly increased volitional muscle activation,as measured by surface *** this study,we further explored the effect of passive activity on surface electromyographic signals during volitional control tasks among individuals with complete spinal cord *** patients with chronic complete thoracic spinal cord injury were *** electromyography data from eight major leg muscles were acquired and compared before and after the passive activity *** results indicated that the passive activity led to an increased number of activated volitional muscles and an increased frequency of *** the cumulative root mean square of surface electromyography amplitude for volitional control of movement showed a slight increase after passive activity,the difference was not statistically *** findings suggest that brief passive activity may enhance the ability to initiate volitional muscle activity during surface electromyography tasks and underscore the potential of passive activity for improving residual motor control among patients with motor complete spinal cord injury.

关键词： complete spinal cord injury cycle training epidural electrical stimulation motor training passive activity physiological state spinal cord circuit surface electromyography volitional control task

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平面零件逆向CAD三维模型生成系统的研究

机械设计 2007年第2期24卷 42-44页

作者：宋胜伟石莉黑龙江科技学院机械工程学院黑龙江哈尔滨150027

应用逆向工程技术,分析了扫描图轮廓线追踪的方法,并以AutoCAD和***为开发环境,具体阐述了扫描图生成CAD三维模型系统的设计理论思想及其实现过程。并以齿轮的扫描图为例,介绍了应用该三维模型系统成功地实现了三维造型的过程。

关键词：逆向工程 AutoCAD 二次开发三维造型

基于CAGD的Inventor零件设计与研究

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煤矿机械 2009年第8期30卷 207-208页

作者：杨晨升宋胜伟黑龙江科技学院机械工程学院哈尔滨150027

在利用Inventor软件进行零件的设计过程中,引入了CAGD作为辅助设计手段,将零件的实体模型抽象化,建立符合设计要求的二维几何模型,借助Inventor软件自身强大的计算功能和尺寸驱动特性,高效、准确地得到设计所需的参数。通过CAGD得到的... 详细信息

在利用Inventor软件进行零件的设计过程中,引入了CAGD作为辅助设计手段,将零件的实体模型抽象化,建立符合设计要求的二维几何模型,借助Inventor软件自身强大的计算功能和尺寸驱动特性,高效、准确地得到设计所需的参数。通过CAGD得到的参数同时又是零件某些结构尺寸的函数,一次设计可以得到一系列零件,使设计的零件具有变量化和参数化的特性。

关键词： Inventor 辅助设计变量化

Boosting Oxygen Evolution Reaction Performance on NiFe‑Based Catalysts Through d‑Orbital Hybridization

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Nano-Micro Letters 2025年第1期17卷 281-292页

作者： Xing Wang wei Pi sheng Hu Haifeng Bao Na Yao wei Luo State Key Laboratory of New Textile Materials and Advanced Processing Technology Key Laboratory of New Textile Materials and Applications of Hubei ProvinceSchool of Materials Science and EngineeringWuhan Textile UniversityWuhan 430200People’s Republic of China College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072People’s Republic of China

Anion-exchange membrane water electrolyzers(AEMWEs)for green hydrogen production have received intensive attention due to their feasibility of using earth-abundant NiFe-based *** introducing a third metal into NiFe-based catalysts to construct asymmetrical M-NiFe units,the d-orbital and electronic structures can be adjusted,which is an important strategy to achieve sufficient oxygen evolution reaction(OER)performance in ***,the ternary NiFeM(M:La,Mo)catalysts featured with distinct M-NiFe units and varying d-orbitals are reported in this *** and theoretical calculation results reveal that the doping of La leads to optimized hybridization between d orbital in NiFeM and 2p in oxygen,resulting in enhanced adsorption strength of oxygen intermediates,and reduced rate-determining step energy barrier,which is responsible for the enhanced OER *** critically,the obtained NiFeLa catalyst only requires 1.58 V to reach 1 A cm^(−2) in an anion exchange membrane electrolyzer and demonstrates excellent long-term stability of up to 600 h.

关键词： NiFe-based catalysts d-orbital coupling Oxygen evolution reaction Anion exchange membrane electrolyzer

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复杂圆柱型波能装置能量转换特性研究

哈尔滨工程大学学报 2010年第8期31卷 1023-1028页

作者：吴必军盛松伟张运秋游亚戈中国科学院广州能源研究所可再生能源与天然气水合物重点实验室广东广州510640

针对波能装置转换效率优化问题,基于线性规则波理论和粘性阻尼建立了复杂圆柱形振荡浮子的一维运动方程,从而得到了振荡浮子的固有频率和阻尼因素表达式,并推导了最佳阻尼和最佳弹簧下波能装置的最优转换效率表达式.研究中采用分离变量... 详细信息

针对波能装置转换效率优化问题,基于线性规则波理论和粘性阻尼建立了复杂圆柱形振荡浮子的一维运动方程,从而得到了振荡浮子的固有频率和阻尼因素表达式,并推导了最佳阻尼和最佳弹簧下波能装置的最优转换效率表达式.研究中采用分离变量法得到了整个无限区域的势函数表达式及振荡浮子附加质量、阻尼系数和波浪激励力表达式.数值计算发现,在某些工况和波浪频率下,振荡浮子的阻尼系数为负值,理论上说明波能装置有发生尖锐共振的条件,此时波能装置将吸收无穷多的波浪能量.

关键词：波浪能线性波理论振动特性尖锐共振复杂圆柱

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双矩形浮子波能装置辐射问题的解析方法

海洋学报 2009年第6期31卷 151-160页

作者：王文胜游亚戈盛松伟吴必军中国科学院广州能源研究所广东广州510640 中国科学院广州能源研究所可再生能源与天然气水合物中国科学院重点实验室广东广州510640 中国科学院研究生院北京100049

在有限水深下1个漂浮在水中的矩形浮子和1个淹没在水下的浮子构成双矩形波能装置模型。基于特征函数展开法求解了线性入射波作用下双矩形浮子波能装置的辐射问题,得出了双矩形浮子辐射速度势的1种新解析式,然后根据Haskind关系由入射势... 详细信息

在有限水深下1个漂浮在水中的矩形浮子和1个淹没在水下的浮子构成双矩形波能装置模型。基于特征函数展开法求解了线性入射波作用下双矩形浮子波能装置的辐射问题,得出了双矩形浮子辐射速度势的1种新解析式,然后根据Haskind关系由入射势和辐射势来计算波浪激励力,并且采用数值方法对相同算例进行了计算,得到了完全一致的结果,从而证明这种方法是正确的。研究了在不同工况下的波浪激励力和系统的水动力学系数变化的规律。

关键词：波能装置水动力系数波浪力解析方法

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滑杆浮子式波浪能装置水动力性能的试验研究

船舶力学 2020年第7期24卷 895-899页

作者：张亚群游亚戈盛松伟王振鹏中国科学院广州能源研究所广州510640 中国科学院可再生能源重点实验室广州510640

本文针对我国能流密度的特点,设计了一种滑杆振荡浮子式波浪能装置,该装置由浮子、滑杆、底座、能量转换系统组成,结构简单,维护方便,成本低廉。为研究此装置的水动力性能,先后在二维、三维水槽中开展了物模试验。本文介绍了装置的整体... 详细信息

本文针对我国能流密度的特点,设计了一种滑杆振荡浮子式波浪能装置,该装置由浮子、滑杆、底座、能量转换系统组成,结构简单,维护方便,成本低廉。为研究此装置的水动力性能,先后在二维、三维水槽中开展了物模试验。本文介绍了装置的整体设计,检测了不同波高、不同周期的入射波作用下,模型在不同负载下获得的液压能,通过数据分析与统计获得模型的俘获宽度比和负载曲线,并通过与普通浮子物模试验的试验数据比较,得出该滑杆浮子式波浪能装置拥有较高的俘获宽度比并具有良好的水动力学性能的结论,明确了浮子质量、入射波波高、入射波周期和负载是决定装置水动力学性能的关键。

关键词：波浪能滑杆浮子水动力学物模试验