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A Coupled Cavitation Model in an Oscillatory Oil Squeeze Film

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Computer Modeling in Engineering & Sciences 2020年第4期123卷 129-152页

作者： Xu Liu Xiaoyang Chen Rongyu Kang Xuejin Shen ben ni Shanghai University Shanghai200072China Ford Motor Company DearbornMI 48126USA

In this paper,the oscillatory oil squeeze film is taken as a research object,and a coupled cavitation model based on the theory of bubble dynamics and hydrodynamic lubrication is used and a specific method of numerical calculation is *** the parallel-plate squeeze film test apparatus is used to validate the coupled cavitation *** pictures of the cavitation were captured by a high-speed camera and then processed to obtain the variation of the cavitation area in *** with the experimental results,the model can successfully predict the process of generation and development of *** the same time,the pressure variation calculated by the model is in good agreement with the experimental data and the value of negative pressure is close to the *** this basis,three new parameters that are related to bubble dynamics are studied by comparing the pressure and cavitation area variation in an oscillating squeeze oil *** results show that surface dilatational viscosity,initial radii of cavitation nuclei and number of bubbles per unit area have a significant influence on the generation time of the cavitation,the maximum tensile stress that the oil film can withstand,and the speed of the cavitation collapse respectively.

关键词： Bubble dynamics oscillatory oil squeeze film cavitation

Analysis of Vibration Mode for H_2+F→HF+H Reaction Mechanism: Density functional Theory Calculation

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Chinese Chemical Letters 2001年第8期12卷 723-726页

作者： ben ni DU Hong Wei GAO Zheng Yu ZHOU Wei Chao ZHANG Department of Chemistry Qufu Normal UniversityShandongQufu 273165 State Key Laboratory Crystal Materials Shandong University ShandongJinan 250100 Department of Chemistry Zaozhuang Tearche's CollegeShangdongZaozhuang 277160

Three density functional theory methods (DFT) have been used to investigate the H2+F?HF+H reaction comparing with the Hartree-Fock method and Moller-Plesset (MP2) perturbation theory method. Through the analysis of the vibrational mode and vibrational frequency in the reaction process, the reaction mechanism has been discussed. The activation energy, the reorganization energy and rate constant of the ET reaction are calculated at semi-quantitative level.

关键词： Density function theory vibratonal mode vibrational frequency

HULL GESTURE AND RESISTANCE PREDICTION OF HIGH-SPEED VESSELS

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Journal of Hydrodynamics 2011年第2期23卷 234-240页

作者： ni Chong-ben ZHU Ren-chuan MIAO Guo-ping FAN Ju School of Naval Architecture Ocean and Civil Engineering State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 China

Since trim and sinkage are significant while vessels are advancing forward with high speed, the predicted vessel resistance based on restrained model theory or experiment may not be real resistance of vessels during voyage. It is necessary to take the influence of hull gesture into account for oredicting the resistance of high-speed ship. In the present work the resistance problem of high speed ship is treated with the viscous flow theory, and the dynamic mesh technique is adopted to coincide with variation of hull gesture of high speed vessel on voyage. The simulation of the models of S60 ship and a trimaran moving in towing tank with high speed are conducted by using the above theory and technique. The corresponding numerical results are in good agreement with the experimental data. It indicates that the resistance prediction for high speed vessels should take hull gesture into consideration and the dynamic mesh method proposed here is effective in calculating the resistance of high speed vessels.

关键词： ship trim and sinkage dynamic mesh high-speed vessel resistance

Path Planning Method Based on D^(*) lite Algorithm for Unmanned Surface Vehicles in Complex Environments

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China Ocean Engineering 2021年第3期35卷 372-383页

作者： YAO Yan-long LIANG Xiao-feng LI Ming-zhi YU Kai CHEN Zhe ni Chong-ben TENG Yue State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Marine Intelligent Equipment and System of Ministry of Education Shanghai Jiao Tong UniversityShanghai 200240China Joint Institute Shanghai Jiao Tong UniversityShanghai 200240China

In recent decades,path planning for unmanned surface vehicles(USVs)in complex environments,such as harbours and coastlines,has become an important *** existing algorithms for real-time path planning for USVs are either too slow at replanning or unreliable in changing environments with multiple dynamic *** this study,we developed a novel path planning method based on the D^(*) lite algorithm for real-time path planning of USVs in complex *** proposed method has the following advantages:(1)the computational time for replanning is reduced significantly owing to the use of an incremental algorithm and a new method for modelling dynamic obstacles;(2)a constrained artificial potential field method is employed to enhance the safety of the planned paths;and(3)the method is practical in terms of vehicle *** performance of the proposed method was evaluated through simulations and compared with those of existing *** simulation results confirmed the efficiency of the method for real-time path planning of USVs in complex environments.

关键词： path planning unmanned surface vehicle D^(*)lite algorithm complex environment

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多酚Canolol生物活性研究进展

食品工程 2024年第3期 23-28页

作者：马丛丛王雷徐珍霞倪犇许继取中国农业科学院油料作物研究所油料脂质化学与营养湖北省重点实验室湖北武汉430062

Canolol (4-vinyl-2,6-dimethoxyphenol)是菜籽油加工过程中产生的一种高效抗氧化剂,具有抗氧化、抗炎、抗癌、保护视网膜、保护心脏、降血糖、改善记忆力、抑菌等生物活性,其作用机制主要涉及环氧化合酶-2/前列腺素E2 (cyclooxygenase-... 详细信息

Canolol (4-vinyl-2,6-dimethoxyphenol)是菜籽油加工过程中产生的一种高效抗氧化剂,具有抗氧化、抗炎、抗癌、保护视网膜、保护心脏、降血糖、改善记忆力、抑菌等生物活性,其作用机制主要涉及环氧化合酶-2/前列腺素E2 (cyclooxygenase-2/prostaglandin E2,COX-2/PGE2)信号通路、磷酸肌醇-3激酶/蛋白激酶B (phosphoinositide 3-kinase/protein kinase B,PI3K/Akt)信号通路、活性氧/丝裂原活化蛋白激酶(reactive oxygen species/mitogen-activated protein kinase,ROS-MAPK)等信号通路和细胞外信号调节激酶(extracellular signal regulated kinase,ERK)级联。通过查阅国内外关于Canolol生物活性的相关文献,对其生物活性与作用机制进行分析,以期为Canolol在药品、食品、化妆品等领域的开发应用提供理论基础和参考。

关键词： Canolol 抗氧化剂生物活性油菜籽

固体粉末添加剂对主轴承空穴噪声的模拟试验研究

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摩擦学学报 2022年第3期42卷 541-551页

作者：刘旭亢荣玉陈晓阳陶德华 ni ben 上海大学机电工程与自动化学院上海200072 美国福特汽车公司全球发动机研发中心密歇根州迪尔伯恩48124

针对汽车发动机主轴承中类似打字机的无规律异常噪声,利用自行研制的平行板挤压油膜试验机模拟发动机主轴承在动态耦合作用下的油膜噪声试验.在试验机可以实现声音、位移、振动、拉压力和油膜空穴图像同步采集基础上,探究了不同固体粉... 详细信息

针对汽车发动机主轴承中类似打字机的无规律异常噪声,利用自行研制的平行板挤压油膜试验机模拟发动机主轴承在动态耦合作用下的油膜噪声试验.在试验机可以实现声音、位移、振动、拉压力和油膜空穴图像同步采集基础上,探究了不同固体粉末添加剂对油膜空穴噪声的影响,其中包括碳粉、多孔质硅铝酸盐、荧光剂(油溶性与非油溶性)和二硫化钼粉末.结果显示碳粉、多孔质硅铝酸盐粉和非油溶性荧光剂粉有抑制油膜空穴噪声的作用,其平均降噪率分别为50%、70%和75%,这表明后两者具有更优的降噪效果.随着加入量的增加,碳粉和多孔质硅铝酸盐粉的抑制噪声作用先增强后趋向平稳,而非油溶性荧光剂粉的抑制噪声作用先增强后减弱.这三者抑制油膜空穴噪声的机理主要是由于其特殊的多孔结构能够增加液体中的成核粒子,形成不易聚集的小空穴,降低了与大气连通的可能性,从而减少了油膜空穴噪声出现的频率.

关键词：发动机主轴承油膜空穴噪声固体粉末添加剂多孔结构

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移动互联网时代淮扬饮食文化审美特征研究

美食研究 2015年第4期32卷 36-40页

作者：孔苏婧佴荣本扬州大学外国语学院江苏扬州225127 扬州大学文学院江苏扬州225002

移动互联网的大众性、直观性和互动性赋予了饮食文化全新的审美特点:对快捷、时尚和娱乐的不懈追求。作为四大菜系之一的淮扬菜,素来富有精致、中和、清雅的审美特点,追求食、味、器、境的完美结合。传统审美邂逅科技审美之时,淮扬饮食... 详细信息

移动互联网的大众性、直观性和互动性赋予了饮食文化全新的审美特点:对快捷、时尚和娱乐的不懈追求。作为四大菜系之一的淮扬菜,素来富有精致、中和、清雅的审美特点,追求食、味、器、境的完美结合。传统审美邂逅科技审美之时,淮扬饮食文化当立足自身特色、不断创新,让淮扬饮食文化既富本土之美,又具创新之美和宜人之美,焕发出新的生机。

关键词：移动互联网淮扬饮食饮食文化审美特征

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超滤膜组件综合测试装置的设计与应用

净水技术 2018年第A2期37卷 35-40,103页

作者：倪奔上海城市水资源开发利用国家工程中心有限公司上海200082

为了实现超滤膜组件常态化性能检测,设计制作了一套超滤膜组件综合测试装置。该装置具备超滤膜完整性、纯水通量、截留率、渗漏、耐压等5项性能测试能力。介绍该装置的构成及工作原理,并针对典型的检测指标进行了测试方法说明。在此基础... 详细信息

为了实现超滤膜组件常态化性能检测,设计制作了一套超滤膜组件综合测试装置。该装置具备超滤膜完整性、纯水通量、截留率、渗漏、耐压等5项性能测试能力。介绍该装置的构成及工作原理,并针对典型的检测指标进行了测试方法说明。在此基础上,开展了超滤膜组件综合测试装置的效果验证试验。试验结果表明,该装置能够实现超滤膜组件的完整性、通量、渗漏、耐压、截留率的测试,试验结论为该装置使用效果良好。

关键词：超滤膜组件测试装置效果验证

“个人账户”改革背景下的医保基金运行态势预测及绩效改善路径

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中国卫生经济 2021年第4期40卷 44-48页

作者：倪伟犇周绿林江苏大学管理学院江苏镇江212013

目的:对"个人账户"改革背景下的对医保基金运行态势进行预测,并探索基金运行绩效的改善路径。方法:根据2019年医疗保障事业发展统计公报和相关文献建立方程并在Vensim中建立医保基金运行系统模型。结果:按照目前的政策条件,个人账户基... 详细信息

目的:对"个人账户"改革背景下的对医保基金运行态势进行预测,并探索基金运行绩效的改善路径。方法:根据2019年医疗保障事业发展统计公报和相关文献建立方程并在Vensim中建立医保基金运行系统模型。结果:按照目前的政策条件,个人账户基金呈现先降低后缓慢上升的态势、统筹账户基金存量、总基金流出速率在未来10年内都呈现指数增长态势。转化时间、统筹基金支付比例的调整,不同程度地影响医保基金的支出情况。结论:加快个账转化为统筹基金的速度、合理确定统筹基金的支付比例、加快推进以价值为基础的支付模式将有益于医保基金的合理运行。

关键词：医保基金个账账户预测绩效