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Numerical simulation of solitary wave propagation based on MPS method

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Acta Oceanologica Sinica 2007年第3期26卷 121-128页

作者： li shaowu YU Zhi＇ an XIONG Zan Department of Port and Coastal Engineering Tianjin University Tianjin 300072 China

The concept of candidate particle set is introduced in the MPS gridless numerical method to generate neighboring particle set ma- trix, which can reduce the CPU time to 1/11 of that before introduction. The Bi-CGSTAB （bi-conjugate gradient stabilized） algorithm is applied to solving the Poisson pressure equation, by which the solving speed is significantly accelerated. The process of solitary waves propagating over a numerical flume and interacting with a vertical wall is simulated. The simulated results of water surface elevation are in good agreement with the analytical solution as well as the measured data. The predicted maximum values of the run-up of solitary waves with various relative incident wave heights agree well with the measured results.

关键词： MPS method candidate particle set Bi-CGSTAB algorithm solitary wave

Numerical Modeling of Floating Oil Boom Motions in Wave-Current Coupling Conditions

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Journal of Ocean University of China 2017年第4期16卷 602-608页

作者： SHI Yang li shaowu ZHANG Huaqin PENG Shitao CHEN Hanbao ZHOU Ran MAO Tianyu State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Tianjin Research Institute for Water Transport Engineering Ministry of Transport

Containment booms are commonly used in collecting and containing spilled oil on the sea surface and in protecting specific sea areas against oil slick *** the present study,a numerical model is proposed based on the N-S equations in a mesh *** proposed model tracks the outline of the floating boom in motion by using the fractional area/volume obstacle representation *** boom motion is then simulated by the technique of general moving *** simulated results of the rigid oil boom motions are validated against the experimental ***,the failure mechanism of the boom is investigated through numerical *** on the numerical results,the effects of boom parameters and dynamic factors on the oil containment performance are also assessed.

关键词： floating oil boom hydrodynamic performance CFD

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针对鸭嘴式铺膜穴播机粘土问题的改进设计

拖拉机与农用运输车 2024年第4期51卷 51-53页

作者：杜元鹏何金伟郭春阳李绍武任远智能农业动力装备全国重点实验室河南洛阳471039 第一拖拉机股份有限公司河南洛阳471003

针对鸭嘴式铺膜穴播机在土壤湿度大于30%区域进行套种作业时出现的鸭嘴粘土问题进行了分析与总结,并在原有基础上实施改进设计,解决了上述问题,其中具有通用性的部分对此种播种机的设计具有一定的参考意义。

关键词：粘土铺膜播种机穴播器鸭嘴

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低温甲醇洗新型高效塔板降低硫含量的应用

云南化工 2024年第7期51卷 130-132页

作者：马云龙孙伯刚王应华李绍武云南省煤炭产业集团有限公司云南昆明650231 云南解化清洁能源开发有限公司解化化工分公司云南开远661600

某公司二甲醚分厂低温甲醇洗H_(2)S吸收塔使用的新型浮阀塔盘脱硫效率低下,影响硫的吸收。通过应用新型高效双层垂直筛板(DVST),提高脱硫效率,降低硫含量,增加甲醇产量。塔顶气相出口中H_(2)S含量从1.60 mg/kg降低到0.15 mg/kg以内,达... 详细信息

某公司二甲醚分厂低温甲醇洗H_(2)S吸收塔使用的新型浮阀塔盘脱硫效率低下,影响硫的吸收。通过应用新型高效双层垂直筛板(DVST),提高脱硫效率,降低硫含量,增加甲醇产量。塔顶气相出口中H_(2)S含量从1.60 mg/kg降低到0.15 mg/kg以内,达到预期目标。

关键词：低温甲醇洗 DVST塔板 H_(2)S

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超声波裁切参数对胎面裁切质量影响的研究

橡胶科技 2024年第8期22卷 456-459页

作者：张华陈军丽于卫远李少武夏晓楠三角轮胎股份有限公司山东威海264200

研究超声波裁刀振幅、低速裁切速度和低速裁切宽度等对不同胶料、不同厚度胎面裁切质量的影响。结果表明:裁刀振幅和低速裁切速度对不同胶料胎面裁切表面平整度影响不同;裁刀振幅过大,胶料生热高,导致气泡增多;低速裁切速度过快易导致... 详细信息

研究超声波裁刀振幅、低速裁切速度和低速裁切宽度等对不同胶料、不同厚度胎面裁切质量的影响。结果表明:裁刀振幅和低速裁切速度对不同胶料胎面裁切表面平整度影响不同;裁刀振幅过大,胶料生热高,导致气泡增多;低速裁切速度过快易导致侧翼卷边,低速裁切速度过慢易导致热量聚集产生气泡与胶末;低速裁切宽度越大,裁刀与胶料接触时间越长,胶料生热高,导致气泡增多。

关键词：轮胎胎面超声波裁刀裁切质量

维普期刊数据库博看期刊

Highly Configurable Floating-Point FFT IP Core with Reusing Method

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Wuhan University Journal of Natural Sciences 2013年第1期18卷 59-66页

作者： liU Sanjun SUN linjiao li shaowu YI Jinqiao MIAO Yuzhuang School of Information Engineering Hubei University for Nationalities School of Electronic Engineering and Computer Science Peking University School of Electronic Engineering and Computer Science Peking University

A highly configurable fast Fourier transform intellec- tual property core （FFT IP core） that can be mounted on Avalon bus ofNios II processor is designed in this paper, by the means of custom-built components in SOPC Builder. Not only the data number can be configured to 2＂ and the data width can be config- ured as integer or floating-point number of 32 bits, but also the number of inner butterfly units is configurable, which can effec- tively resolve the contradiction between speed and hardware re- source occupancy. The IP core is designed by butterfly computing elements of a mixed radix-4 and radix-2 algorithm and applies the in-place addressing scheme and reusing method to reduce hard- ware resources consumption. Functional simulation by Quartus II platform proves that the results calculated by FFT IP core are ac- cordant with the Matlab results. Hardware test on DE2 develop- ment board by timestamp timer demonstrates that the FFT IP core costs only 34.8 μs to achieve FFT of 512 sampled data with preci- sion of 32-bit floating point. It is demonstrated that the IP core has the advantages of feasible configuration, easy use, and high preci- sion.

关键词： fast Fourier transform (FFT) IP core embeddedsystem in-place SOPC

Neural Stem Cells Transfected with Leukemia Inhibitory Factor Promote Neuroprotection in a Rat Model of Cerebral Ischemia

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Neuroscience Bulletin 2019年第5期35卷 901-908页

作者： lili Tian Wenli Zhu Yuanchu liu Ye Gong Aowei Lv Zhen Wang Xiaoli Ding shaowu li Ying Fu Yi lin Yaping Yan Department of Neurology Tianjin Neurological Institute Tianjin Medical University General Hospital Tianjin 300052 China Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry National Engineering Laboratory for Resource Development of Endangered Crude Drugs in Northwest of China College of Life Sciences Shaanxi Normal University Xi’an 710119 China Department of Function Neuroimaging Neurosurgical Institute Capital Medical University Beijing 100050 China Department of Neurology and Institute of Neurology The First Affiliated Hospital of Fujian Medical University Fuzhou 350000 China

Leukemia inhibitory factor(liF) contributes to the neuroprotection by neural stem cells(NSCs) after ischemic stroke. Our aim was to explore whether liFtransfected NSCs(liF-NSCs) can ameliorate brain injury and promote neuroprotection in a rat model of cerebral ischemia. To accomplish this goal, we transfected NSCs with a lentivirus carrying the liF gene to stably overexpress liF. The liF-NSCs reduced caspase 3 activation under conditions of oxygen-glucose deprivation in *** cerebral ischemia was induced in rats by 2 h of middle cerebral artery occlusion(MCAo), and liF-NSCs were intravenously injected at 6 h post-ischemia. liF-NSC treatment reduced the infarction volume and improved neurological recovery. Moreover, liF-NSCs improved glial cell regeneration and ameliorated white matter injuryin the MCAo rats. The NSCs acted as carriers and increased the expression of liF in the lesions to protect against cerebral infarction, suggesting that liF-NSCs could be a potential treatment for cerebral infarction.

关键词： Leukemia inhibitory factor Neural stem cells Cerebral ischemia Infarction volume Neurological recovery

Economic Evaluation and Configuration Optimization Strategy of Hybrid Renewable Energy Generation System: A Review

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Economic Evaluation and Configuration Optimization Strategy ...

第32届中国控制与决策会议

作者： Zhou Yong li shaowu School of Information Engineering Hubei Minzu University

According to the global study achievements of the continuous prosperous development on renewable energy systems, the paper overviews the multi-source hybrid generation technologies and their satisfactory practicality in the application schemes primarily. Meanwhile, the evaluation approaches regarding relevant techno-economic indices are collected in detail. And the effectiveness of the optimization strategies concretely proposed by the relevant prominent researches is analyzed purposefully, which can precisely adjust the configuration and operation of renewable energy systems for the ideal payback. Ultimately, this review presents summarization, appraisal and prospect of the described approaches in the references.

关键词： Economic Evaluation Renewable Energy Hybrid Generation Optimization Strategy

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轻型履带车辆行走系的结构设计与选型计算

拖拉机与农用运输车 2024年第2期51卷 95-98页

作者：李绍武郭春阳杜元鹏于春伟朱文娟魏磊智能农业动力装备全国重点实验室河南洛阳471039 洛阳拖拉机研究所有限公司河南洛阳471039

随着辣椒种植规模的扩大,缺乏适宜的套种作业机械、人工成本高及作业效率低的问题严重制约了辣椒产业的发展。开发一种适应“麦椒套种”的轻型履带车辆显得尤为重要。本文结合轻型履带车辆的使用环境、工作目标及工作性能,确定轻型履带... 详细信息

随着辣椒种植规模的扩大,缺乏适宜的套种作业机械、人工成本高及作业效率低的问题严重制约了辣椒产业的发展。开发一种适应“麦椒套种”的轻型履带车辆显得尤为重要。本文结合轻型履带车辆的使用环境、工作目标及工作性能,确定轻型履带车辆的行走系结构,并对行走系的关键部件和参数进行了选型设计;通过对轻型履带行走系转向受力分析,计算出转向时所需的最大驱动力矩,并以此选择静液压装置;为行走系设计提供依据并为后续变形设计积累技术资料。

关键词：套种履带车辆行走系