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Heavy soil drying during mid-to-late grain filling stage of the main crop to reduce yield loss of the ratoon crop in a mechanized rice ratooning system

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The Crop Journal 2022年第1期10卷 280-285页

作者： Chang Zheng Yuechao Wang Shen yuan Sen xiao Yating Sun Jianliang huang Shaobing Peng National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryMARA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze RiverCollege of Plant Science and TechnologyHuazhong Agricultural UniversityWuhan 430070HubeiChina

Yield loss(Y_(Loss)) in the ratoon crop due to crushing damage to left stubble from mechanical harvesting of the main crop is a constraint for wide adoption of mechanized rice ratooning *** drying before the harvest of the main crop has been proposed to overcome this *** objective of this study was to determine the effect of soil drying during the mid-to-late grain filling stage of the main crop on grain yield of the ratoon crop in a mechanized rice ratooning *** experiments were conducted to compare Y_(Loss) between light(LD) and heavy(HD) soil drying treatments in Hubei province,central China in 2017 and 2018.Y_(Loss) was calculated as the percentage of yield reduction in the ratoon crop with the main crop harvested mechanically,relative to the grain yield of the ratoon crop with the main crop harvested *** comparison with LD,soil hardness was increased by 42.8%-84.7% in HD at the 5-20 cm soil depth at maturity of the main *** hardness at 5 and 10 cm depths reached respectively 4.05 and 7.07 kg cm^(-2) in *** drying treatment did not significantly affect the grain yield of the main *** mechanical harvesting of the main crop,HD increased the grain yield of the ratoon crop by 9.4% relative to ***,Y_(Loss) was only 3.4% in HD,in contrast to 16.3% in *** differences in grain yield and Y_(Loos) between the two soil drying treatments were explained mainly by panicles m^(-2),which was increased significantly by HD in the track zone of the ratoon crop compared with *** results suggest that heavy soil drying practice during the mid-to-late grain filling stage of the main crop is effective for reducing Y_(Loss) of the ratoon crop in a mechanized rice ratooning system.

关键词： Crushing damage Mechanical harvesting Ratoon rice Soil drying Yield loss

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Smash product algebras over twisted dimodule algebras

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Applied Mathematics(A Journal of Chinese Universities) 2008年第3期23卷 366-370页

作者： CHEN xiao-yuan Zhejiang Vocational College of Commerce Hangzhou 310053 China

Results of the research for smash product algebras over dimodule algebras are generalized to the more general twisted dimodule algebras.

关键词： Hopf algebra twisted dimodule algebra

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General variational solution for seismic and static active earth pressure on rigid walls considering soil tensile strength cut-off

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第5期24卷 432-449页

作者： Shiguo xiao yuan QI Pan XIA Key Laboratory of High-Speed Railway Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 60031China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Department of Geological Engineering Southwest Jiaotong UniversityChengdu 610031China

According to the limit equilibrium state of soils behind rigid walls and the pseudo-static approach,a general closed-form solution to seismic and static active earth pressure on the walls,which considers shear and tension failure of the retained soil,is put forward using a variational calculus *** application point of the active resultant force specified in the proposed method is explained with a clear physical meaning related to possible movement modes of the *** respect of the derived nine dependent equations reflecting the functional characteristics of the earth pressure,the proposed method can be performed easily via an implicit *** are 13 basic factors related to the retained soils,walls,and external loads to be involved in the proposed *** tension crack segment of the slip surface is obviously influenced by these parameters,apart from vertical seismic coefficient and geometric bounds of the surcharge,but the shear slip segment maintains an approximately planar shape almost uninfluenced by these ***,the proposed method quantitatively reflects that the resultant of the active earth pressure is always within a limited range under different possible movements of the same wall.

关键词： Active earth pressure Tensile strength cut-off Variational calculus method Pseudo-static method Strip surcharge

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Crystal Structure of Sar1[H79G]-GDP Which Provides Insight into the Coat-controlled GTP Hydrolysis in the Disassembly of COP Ⅱ

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Chinese Journal of Structural Chemistry 2006年第7期25卷 854-860页

作者： RAO Yi-Jian yuan Cai BIAN Chuan-Bing HOU xiao-Min LI Yong-Dong ZHAO Geng-Xiang YE xiao-Ming huang Zi-Xiang huang Ming-Dong State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China

Sarl is a small GTPase involved in COPⅡ vesicle transport. Previous studies showed that H79G mutation of Sarl can lock Sarl in its GTP-bound active conformation, stabilize coat assembly, and prevent the disassembly of COP Ⅱ vesicle coats by reducing Sec23/24 GAP- stimulated hydrolysis. We show here that the replacement of His79 by glycine induces a large conformation change in switch Ⅱ and results in the lost of hydrogen bond between His79 and its associated nucleophilic water molecule that was hypothesized to reduce the GAP-stimulated hydrolysis during the COP Ⅱ assembly and disassembly. These results confirm that the switch Ⅱ conformation is important for COP Ⅱ disassembly through coat-controlled GTP hydrolysis.

关键词： Sarl switch Ⅱ COP Ⅱ disassembly crystal structure

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Effects of Cu addition on microstructureand mechanical properties of as-cast Mg-6Znmagnesium alloy

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China Foundry 2017年第4期14卷 251-257页

作者： Yu Zhang xiao-feng huang Ying Ma Ti-jun Chen yuan-dong Li yuan Hao State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

The application of Mg-Zn binary alloys is restricted due to their developed dendritic microstructure and poor mechanical properties. In this study, an alloying method was used to improve the mechanical properties of Mg-Zn alloy. The Mg-6Zn magnesium alloys microalloyed with varying Cu content(0, 0.8, 1.5, 2.0 and 2.5wt.%) were fabricated by permanent mould casting, and the effects of Cu content on the microstructure and mechanical properties of as-cast Mg-6Zn alloys were studied using OM, SEM, XRD and tensile tests at room temperature. The obtained results show that the addition of Cu not only can refine the grains effectively, but also can modify the eutectic morphology and improve the mechanical properties of the alloys. The main phases of the studied alloys include α-Mg, MgZn_2, Mg_2Cu and CuMgZn. When the content of Cu exceeds 0.8wt.%, Mg_2Cu phase appears. Meanwhile, the eutectic morphology is modified into dendritic shape or lamellar structure, which has an adverse effect on the tensile properties. Furthermore, among the investigated alloys, the alloy containing 0.8% Cu shows an optimalultimate tensile strength of 196 MPa, while the alloy with 1.5wt.% Cu obtains an excellent elongation of 7.22%. The experimental alloys under different Cu contents show distinguishing fracture behaviors: the fracture of the alloy with 0.8wt.% Cu reveals a mixed mode of inter-granular and quasi-cleavage, while in other investigated alloys, the fracture behaviors are dominated by cleavage fracture.

关键词： Mg-Zn magnesium alloy Cu addition microstructure mechanical property fracture mode

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Adjustable ion energy barrier for reliable memristive neuromorphic systems

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Science China Materials 2024年第11期67卷 3759-3760页

作者： Tianci huang Zuqing yuan School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081China

With the rapid development of artificial intelligence and the processing of large-scale data,the demand for low-power and high-speed computing has become increasingly crucial[1].Neuromorphic computing,which mimics the neural structure of the human brain,offers a promising solution to overcome the limitations of traditional von Neumann architecture[2,3].

关键词： overcome limitations barrier

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Strain concentration factor of heterogeneous materials and analytical influence functions based on Eshelby tensor

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Theoretical & Applied Mechanics Letters 2024年第4期14卷 306-313页

作者： Shanqiao huang Zifeng yuan HEDPS Center for Applied Physics and TechnologyDepartment of Mechanics and Engineering SciencePeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing 100871China

In this manuscript,Eshelby tensor is employed to assess the strain concentration that arises in the matrix phase at the interface,offering precise values and locations of maximum strain under specific loading conditions for both spherical and cylindrical *** compared to numerical simulation results,the analytical predictions grounded in the Eshelby tensor exhibit satisfactory *** an analytical calculation method based on Eshelby tensor for the elastic strain influence functions of reduced-order homogenization(ROH)method is developed and adopted on particle-reinforced and fibrous composites,presenting its feasibility and advantage on off-line stage calculation of ROH *** error analyses between analytical and numerical results are *** numerical results also exhibit the necessity of finer interface partitioning to obtain the response on micro-scale with higher resolution.

关键词： Eshelby tensor Strain concentration Composite structures Reduced-order-homogenization Influence functions

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A Trust Evaluation Mechanism Based on Autoencoder Clustering Algorithm for Edge Device Access of IoT

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Computers, Materials & Continua 2024年第2期78卷 1881-1895页

作者： xiao Feng Zheng yuan Cyber Security Academy Beijing University of Posts and TelecommunicationsBeijing100876China Department of Cyberspace Security Beijing Electronic Science and Technology InstituteBeijing100070China State Grid Info-Telecom Great Power Science and Technology Co. Ltd.Beijing102211China

First,we propose a cross-domain authentication architecture based on trust evaluation mechanism,including registration,certificate issuance,and cross-domain authentication processes.A direct trust evaluation mechanism based on the time decay factor is proposed,taking into account the influence of historical interaction *** weight the time attenuation factor to each historical interaction record for updating and got the new historical record *** refer to the beta distribution to enhance the flexibility and adaptability of the direct trust assessment model to better capture time trends in the historical *** we propose an autoencoder-based trust clustering *** perform feature extraction based on *** leibler(KL)divergence is used to calculate the reconstruction *** constructing a convolutional autoencoder,we introduce convolutional neural networks to improve training efficiency and introduce sparse constraints into the hidden layer of the *** sparse penalty term in the loss function measures the difference through the KL *** clustering is performed based on the density based spatial clustering of applications with noise(DBSCAN)clustering *** the clustering process,edge nodes have a variety of trustworthy attribute *** assign different attribute weights according to the relative importance of each attribute in the clustering process,and a larger weight means that the attribute occupies a greater weight in the calculation of ***,we introduced adaptive weights to calculate comprehensive trust *** experiments prove that our trust evaluation mechanism has excellent reliability and accuracy.

关键词： Cross-domain authentication trust evaluation autoencoder

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在他乡良缘更好吗——迁移流动对个人婚姻匹配的影响

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山西财经大学学报 2025年第1期47卷 48-59页

作者：黄小丽丁金宏王俊松华东师范大学社会发展学院华东师范大学地理科学学院

基于2010—2021年中国综合调查数据，实证研究迁移流动对婚姻匹配的影响。结果表明：婚前迁移显著提升了匹配到配偶的社会经济地位，其中自身社会经济地位提高和择偶场域改善是实现配偶社会经济地位提升的重要解释机制；与婚后迁移者相... 详细信息

基于2010—2021年中国综合调查数据，实证研究迁移流动对婚姻匹配的影响。结果表明：婚前迁移显著提升了匹配到配偶的社会经济地位，其中自身社会经济地位提高和择偶场域改善是实现配偶社会经济地位提升的重要解释机制；与婚后迁移者相比，婚前迁移通过拓展迁移者的社会交往，使其有机会结识社会经济地位更高的异性。异质性分析表明：相较于农业户籍，婚前迁移对非农户籍人群配偶质量的提升效应更显著；与未迁移人群相比，这种提升效应在中下阶层更明显。结论意味着，迁移流动有可能成为提升个体婚姻匹配质量的重要途径。

关键词：迁移流动婚姻匹配社会经济地位社会交往同质匹配择偶场域婚前迁移婚后迁移

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In-situ determination of onset lithium plating for safe Li-ion batteries

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Journal of Energy Chemistry 2022年第4期31卷 255-262页

作者： Lei Xu Yi Yang Ye xiao Wen-Long Cai Yu-Xing Yao xiao-Ru Chen Chong Yan Hong yuan Jia-Qi huang School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Shanxi Research Institute for Clean Energy Tsinghua UniversityTaiyuan 030032ShanxiChina

Lithium plating in working batteries has attracted wide attention in the exploration of safe energy storage. Establishing an effective and rapid early-warning method is strongly considered but quite challenging since lithium plating behavior is determined by diverse factors. In this contribution, we present a non-destructive electrochemical detection method based on transient state analysis and threeelectrode cell configuration. Through dividing the iR drop value by the current density, the as-obtained impedance quantity(R_(i)) can serve as a descriptor to describe the change of electrochemical reaction impedance on the graphite anode. The onset of lithium plating can be identified from the sharp drop of R_(i). Once the dendritic plated lithium occurs, the extra electrochemical reactions at the lithium interfaces leads to growing active area and reduced surface resistance of the anode. We proposed a protocol to operate the batteries under the limited capacity, which renders the cell with 98.2% capacity retention after 1000 cycles without lithium plating. The early-warning method has also been validated in in-situ optical microscopy batteries and practical pouch cells, providing a general but effective method for online lithium plating detection towards safe batteries.

关键词： Lithium plating In-situ detection method Transient state analysis iR drop Three-electrode battery Lithium-ion batteries

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