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Investigation of interaction effect between static and rolling friction of corn kernels on repose formation by DEM

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International Journal of Agricultural and biological Engineering 2021年第5期14卷 238-246页

作者： Linrong Shi Xiaoping Yang Wuyun Zhao Wei sun Guanping Wang Bugong sun College of Mechanical and Electrical Engineering Gansu Agricultural UniversityLanzhou 730070China

The coefficient of static friction(SF),the coefficient of rolling friction(RF)for particles are two key parameters affecting the repose angle formation and flow *** this paper,the interaction effects of SF and RF on the formation process of corn repose angle was investigated by the discrete element ***,five shape kinds of corn models(horse tooth,spherical cone,spheroid,oblate,and irregular shape)were ***,aluminum cylinder and organic glass box were used to conduct the simulation experiments with taking SF and RF as independent factors and seeing the repose angle as dependent *** on simulation results the regression equations were *** results showed the relation between two factors and the rotational kinetic energy is not nonlinear,and SF does not significantly restrict the flow of corn models after increasing the flow direction,and the effect of SF on the contact number between corns and the bottom plate is remarkable,while the effect of RF on the contact number is not ***,the interaction effect of two factors on the repose angle was analyzed by variance analysis and results showed SF and RF all have a significant impact on the repose ***,their interaction effect has an impact on the repose angle.

关键词： corn kernels coefficient of static friction coefficient of rolling friction repose angle interaction influence

Acidolysis hydrocarbon characteristics and significance of sediment samples from the ODP drilling legs of gas hydrate

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Geoscience Frontiers 2012年第4期3卷 515-521页

作者： Xun sun Chunyan sun Jiangyun Xiang Jihui Jia Panfeng Li Zhibin Zhang School of Energy China University of Geosciences Beijing 100083 China School of Engineering and Technology China Universi-ty of Geosciences Beijing 100083 China

To study on the significance and basis of acidolysis index to China marine gas hydrate exploring, since 2006, 111 samples derived from Leg 164 and 204 of the Ocean Drilling Program （ODP） were analyzed in the experiment center of China Petroleum Exploration Research Institute to obtain data on acidolysis hydrocarbon index and methane carbon isotopes by the gas chromatography （GC） of PE AutoSystem XL and isotope mass spectrometer （IRMS） of Finnigan MAT25 I. Through these, we study the reliability of the acidolysis method and characterize the gas hydrate potential. The results show that the acidolysis hydrocarbon index has a stable correspondence with the Gas Hydrate Stability Zone （GHSZ） in the ODE and that there are clear abnormal signs in shallow samples that might reliably reflect the existence of authigenic carbonate caused by hydrocarbon migration from bottom hydrate. We therefore propose that the ability to characterize the acidolysis hydrocarbon is crucial to submarine gas hydrate exploration in China.

关键词： Ocean Drilling Program (ODP) Gas Hydrate Stability Zone (OHSZ) Acidolysis hydrocarbon index Acidolysis hydrocarbon methane carbon isotopes Geochemical characteristics

Co-Construction of Sulfur Vacancies and Heterogeneous Interface into Ni_(3)S_(2)/MoS_(2) Catalysts to Achieve Highly Efficient Overall Water Splitting

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Chinese Journal of Structural Chemistry 2022年第8期41卷 37-43页

作者： Zhaoyang An Hui Xue Jing sun Niankun Guo Tianshan Song Jiawen sun Yi-Ru Hao Qin Wang College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

Integrating the advantages of anion vacancies and heterostructures into the catalytic materials may increase the binding affinities to intermediates, provide more active sites, and significantly promote the activity of overall water splitting. However, the successful assembly of anion vacancies and heterostructures for high-efficiency water splitting performance is still challenging. In this work, we ingeniously present the co-construction of sulfur vacancies and heterogeneous interface into Ni_(3)S_(2)/MoS_(2) catalysts on nickel foam(NF). The introduction of sulfur vacancies and Ni_(3)S_(2)/MoS_(2) heterostructures can significantly improve electron and ion transport, effectively improve structural stability, and enhance overall water splitting activity. The obtained VSNi_(3)S_(2)/MoS_(2) catalysts(VS stands for sulfur vacancies) exhibit superior OER and HER activities,and the overpotentials for OER and HER are 180 and 71 mV at 10 mA·cm^(-2), respectively. Furthermore, a low water splitting voltage of 1.46 V is required at 10 mA·cm^(-2) for the VS-Ni_(3)S_(2)/MoS_(2) catalysts, which is considerably lower than most that of water splitting electrocatalysts currently reported. This work offers an effective mean for the preparation of catalysts with both anion vacancies and heterostructures for achieving high-performance alkaline overall water splitting.

关键词： sulfur vacancies heterostructures transition metal chalcogenides overall water splitting

Water Stability Improvement of Acid Fine Aggregate-Based Asphalt Concrete

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Fluid Dynamics & Materials Processing 2023年第8期19卷 2171-2180页

作者： Yihan sun Lihua Chu Yudong Cheng Fengxia Chi Chenchen Zhang Pengcheng sun Zhejiang Scientific Research Institute of Transport Hangzhou310023China Zhejiang Key Laboratory of Road and Bridge Detection and Maintenance Technology Hangzhou310023China Huzhou Administration of Highway and Transportation Huzhou313000China China University of Geosciences(Wuhan) Wuhan430074China

In general,acid aggregates are not used in combination with asphalt concrete because of their poor compatibility with the asphalt binder,which typically results in a scarce water stability of the *** the present study,the feasibility of a new approach based on the combination of acid granite fine aggregate with alkaline limestone coarse aggregate and Portland cement filler has been *** mineral and chemical compositions of these three materials have first been analyzed and ***,the effect of different amounts of Portland cement(0%,25%,50%,75%and 100%of the total filler by weight)on the mechanical performance and water stability of the asphalt concrete has been *** concrete has been designed by using the Marshall method,and the mechanical performance indexes of this material,including the Marshall stability and indirect tensile strength(ITS),have been measured together with the related water stability indexes(namely the Marshall stability(RMS)and tensile strength ratio(TSR)).The results indicate that the alkaline limestone coarse aggregate and Portland cement filler can balance the drawback caused by the acid granite fine *** asphalt concrete has good mechanical performances and water stability when the amount of common limestone powder filler replaced by cement is not less than 75%.

关键词： Limestone granite portland cement asphalt concrete mechanical performance water stability

门限分红策略下复合Poisson风险模型的绝对破产

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山东大学学报（理学版） 2010年第3期45卷 105-110页

作者：孙景云兰州城市学院数学学院甘肃兰州730070

考虑了具有借贷利率和门限分红策略下复合Poisson风险模型的绝对破产问题。利用对首次索赔发生时刻取条件的方法推导出绝对破产概率和绝对破产发生时赤字的分布满足具有一定边界条件的积分-微分方程组。当索赔额为指数分布时,给出了绝... 详细信息

考虑了具有借贷利率和门限分红策略下复合Poisson风险模型的绝对破产问题。利用对首次索赔发生时刻取条件的方法推导出绝对破产概率和绝对破产发生时赤字的分布满足具有一定边界条件的积分-微分方程组。当索赔额为指数分布时,给出了绝对破产概率和绝对破产发生时赤字分布的解析表达式。

关键词：绝对破产门限分红策略积分-微分方程绝对破产赤字

A Distortion Self-Calibration Method for binocular High Dynamic Light Adjusting and Imaging System Based on Digital Micromirror Device

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IEEE/CAA Journal of Automatica Sinica 2024年第9期11卷 2036-2038页

作者： Pei Wu Yanjie Wang Honghai sun Zhuoman Wen University of Chinese Academy of Sciences Beijing 100049and NIO Inc.Shanghai 200000China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

Dear Editor,In order to realize the pixel level light adjusting control of the binocular high dynamic light adjusting and imaging system, this letter proposed a novel self-calibration method. By analyzing the optical design of the system, the causes of the distortion are given and a distortion model is established. Then, a quick and accurate self-calibration method is designed. The experiments indicate that the method can calibrate the two image sensors of the system at the same time,the average pixel deviation of the calibrated system is less than 0.5pixels and the maximum deviation is less than 1 pixel.

关键词： Dynamic system deviation

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非线性振动下倾斜通道气液两相流动实验研究

高校化学工程学报 2020年第4期34卷 930-938页

作者：孙博周云龙常赫东北电力大学能源与动力工程学院吉林吉林132012

为了研究非线性振动工况下倾斜通道气液两相流,将振动装置与气液两相流实验回路相结合,通过改变通道倾角及振动参数进行实验研究。由实验得到的流型图表明,非线性振动工况和稳态工况下的气液两相流动形式不同,增大倾角和振动参数会导致... 详细信息

为了研究非线性振动工况下倾斜通道气液两相流,将振动装置与气液两相流实验回路相结合,通过改变通道倾角及振动参数进行实验研究。由实验得到的流型图表明,非线性振动工况和稳态工况下的气液两相流动形式不同,增大倾角和振动参数会导致流型转换界限发生改变。由实验得到的气液界面分布情况表明,振动频率主要影响相界面波动程度,振动幅度主要影响截面空隙率,倾角主要影响气泡形状及液面波动角度。结果表明,通过对比非线性振动工况下倾斜通道内空隙率的预测值与实验值,稳态下两相流空隙率计算公式同样适用于非线性振动工况。

关键词：倾斜通道气液两相流非线性振动空隙率

FBXW7 E3 ubiquitin ligase:degrading,not degrading,or being degraded

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Protein & Cell 2019年第12期10卷 861-863页

作者： Huiyin Lan Yi sun The Cancer Institute of the Second Affiliated Hospital and Institute of Translational Medicine Zhejiang University School of MedicineHangzhou 310029 China 2 Department of Radiation Oncology Zhejiang Key Lab of Radiation OncologyZhejiang Cancer HospitalHangzhou 310022 China 3 Division of Radiation and Cancer biology Department of Radiation OncologyUniversity of MichiganAnn ArborMl 48109USA

It is well-established that FBXW7 acts as a tumor suppressor by promoting the polyubiquitylation via the K48 linkage of a broad range of oncoproteins for proteasome *** and the others found that FBXW7 also recognizes noncanonical substrates,such as XRCC4 or y-catenin for polyubiquitylation via the K63 linkage,not for degradation,but for functional *** recently,we found that FBXW7 binds to a pseudo-substrate LSD1,not for degradation,rather being ***,FBXW7 has three modes of action in a manner dependent of substrates,leading to different biological consequences.

关键词： FBXW7 linkage suppressor

由“经济”到学术:现代政治学科在北京大学的建立

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中山大学学报（社会科学版） 2010年第4期50卷 85-97页

作者：孙宏云中山大学历史系

现代政治学科在北大的建立经历了一个由知识变动与权力规训的复杂过程。清末,经世思潮与"中体西用"论结合,催生了京师大学堂等新式教育机构,以此来接纳西学与西政。由于立学宗旨尚停留在传统的经世济民之政治概念上,统治者便力求将法政... 详细信息

现代政治学科在北大的建立经历了一个由知识变动与权力规训的复杂过程。清末,经世思潮与"中体西用"论结合,催生了京师大学堂等新式教育机构,以此来接纳西学与西政。由于立学宗旨尚停留在传统的经世济民之政治概念上,统治者便力求将法政教育约束在国家治理的应用层面。进入民国,蔡元培对北大法科进行人事整顿与制度改革,着力引导其走向学术化道路。周鲠生、王世杰等英美派留学生因之掌控了法科的学术行政职位,推动了法科教学制度与研究风气的转变,北大政治学系开始实现由欧陆派的国家学向美国流的政治学转变,与此同时,研究所、学会、专业学术期刊等相应的现代学术建置也陆续出现,标志着现代政治学科在北大的建立。

关键词：北京大学政治学蔡元培