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Lithium-induced graphene layer containing Li_(3)P alloy phase to achieve ultra-stable electrode interface for lithium metal anode

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Rare Metals 2024年第2期43卷 562-574页

作者： Jia-Xin Chen Guo-Qiang Zhang Xian-Ying Qin Kui Lin Zi-Jin Yang Ge-Meng Liang Yue Xia Guo-Bin Zhang Hai-Kun Wu qiu-chan Cai Hai Lin Bao-Hua Li Shenzhen Key Laboratory on Power Battery Safety Research and Shenzhen Geim Graphene Center Tsinghua Shenzhen International Graduate SchoolShenzhen518055China Shenzhen Graphene Innovation Center Co. Ltd.Shenzhen518107China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA5005Australia Department of Chemistry City University of Hong KongHong Kong990077China

Uncontrolled growth of lithium dendrite will lead to low Coulombic efficiency and poor cycle stability,which hinders the commercialization of lithium metal ***,a novel modified lithium anode with reduced graphene oxide conductive network containing trace lithiophilic phosphorus(P-rGO/Cu)is prepared by electrospraying technique combined with heat treatment *** rGO layer has a concave and undulating conductive structure,which can significantly improve the effective electrical contact between lithium metal and the current collector,speed up the kinetics of interfacial electron transport and reaction,and improve the resistance of the negative electrode to the internal stress caused by volume change of the lithium,which is advantageous for the stability of the SEI *** extremely small and uniformly distributed red phosphorus element avoids the volume change caused by lithiation to the maximum *** two-phase compound Li_(3)P obtained by alloying P with Li can directionally induce the homogeneous nucleation and dense deposition of lithium metal,address the issue of lithium dendrites and extend the cycle life of the *** obtained P-rGO/Cu exhibits excellent electrochemical performance with an average Coulombic efficiency(CE)of 98%at a current density of 1 mA·cm^(−2) for 400 cycles,and the capacity retention rate of the full cell matched with lithium iron phosphate(LFP)is 83%after 400 cycles at 1C.

关键词： Lithium anode Dendrite-free Lithiophilicity Induced nucleation deposition

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基于小样本数据增广的产品服役性能预测方法

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机械工程学报 2024年第6期60卷 11-20页

作者：刘振宇张楠裘辿谭建荣浙江大学计算机辅助设计与图形学国家重点实验室杭州310027

高精密机械产品往往生产规模有限,且各装配特征参数与性能之间存在错综复杂的耦合关系,难以用显性的映射关系表达。构建能够准确预测服役性能的映射模型,对于产品装调具有切实的指导意义。为此,提出一种小样本数据下产品服役性能多参数... 详细信息

高精密机械产品往往生产规模有限,且各装配特征参数与性能之间存在错综复杂的耦合关系,难以用显性的映射关系表达。构建能够准确预测服役性能的映射模型,对于产品装调具有切实的指导意义。为此,提出一种小样本数据下产品服役性能多参数关联分析与预测方法。考虑重要组件装配结合面接触刚度特征,将接触刚度与原始装配数据相融合;通过随机森林对装配特征参数进行重要度排序,筛选出关键特征;针对小样本不完备数据,利用变分自动编码器学习先验分布知识,实现装配数据的模拟增广,并对增广数据进行离群值修正;将装配增广样本与原始装配数据相融合,通过集成核超限学习机实现服役性能的预测。最后以某型位标器陀螺仪稳速电流预测为例,验证提出方法的有效性。

关键词：小样本数据增广接触特性服役性能超限学习机

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生物质炭与铁钙材料对镉砷复合污染农田土壤的修复

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环境科学 2024年第1期45卷 450-458页

作者：吴秋产吴骥子赵科理连斌袁峰孙淇田欣浙江农林大学环境与资源学院杭州311300 浙江农林大学浙江省土壤污染生物修复重点实验室杭州311300

选取了铁钙材料(FC)和山核桃蒲生物质炭(BC)制备得到复合材料(BF),用于修复农田土壤中镉砷复合污染,以降低水稻糙米中的镉和砷含量.通过水稻盆栽试验,在植物生长期内,采集了土壤孔隙水、根际土壤、非根际土壤、水稻植株和水稻根表铁膜,... 详细信息

选取了铁钙材料(FC)和山核桃蒲生物质炭(BC)制备得到复合材料(BF),用于修复农田土壤中镉砷复合污染,以降低水稻糙米中的镉和砷含量.通过水稻盆栽试验,在植物生长期内,采集了土壤孔隙水、根际土壤、非根际土壤、水稻植株和水稻根表铁膜,探究了铁钙材料、生物质炭及其复合材料对土壤中镉和砷生物有效性和植株中镉和砷含量的影响及机制.结果表明,生物质炭材料能显著(P<0.05)提高非根际土壤(0.55~0.66个单位)和根际土壤(0.28~0.36个单位)pH,且提升土壤DOC含量;铁钙材料能显著(P<0.05)降低非根际土壤(0.14~0.27个单位)和根际土壤(0.38~0.41个单位)pH,同时降低土壤DOC含量.铁钙材料和复合材料能够同时降低土壤孔隙水、根际土壤和非根际土壤有效态Cd和As含量,而生物质炭能降低Cd含量,却提高了As含量,其中复合材料1%添加处理的效果最佳,土壤有效态Cd和As分别降低了41.8%~48.2%和6.1%~10.1%.生物质炭、铁钙材料和复合材料均能提高植株生物量(根、茎、叶和籽粒的干重),水稻籽粒干重较CK增加了48.5%~184.0%,根表铁膜含量增加7.5%~13.6%.与空白对照组相比,生物质炭能够有效降低水稻糙米中Cd含量(21.0%~26.1%),铁钙材料和复合材料能够同时降低糙米中Cd和As含量,其中复合材料对糙米中Cd和As降低效果最佳,降幅高达36.9%~42.0%和40.4%~44.4%,使水稻糙米Cd和As含量均低于国家标准值(GB 2762-2017).

关键词：生物质炭铁钙材料镉(Cd) 砷(As) 农田土壤

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Design Theory and Method of Complex Products:A Review

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 1-16页

作者： chan qiu Jianrong Tan Zhenyu Liu Haoyang Mao Weifei Hu State Key Laboratory of CAD&CG Zhejiang UniversityHangzhou 310027China

Design is a high-level and complex thinking activity of human beings,using existing knowledge and technology to solve problems and create new *** the rise and development of intelligent manufacturing,design has increasingly reflected its importance in the product life ***,the concept and connotation of complex product design is expounded systematically,and the different types of design are *** four schools of design theory are introduced,including universal design,axiomatic design,TRIZ and general *** the research status of complex product design is analyzed,such as innovative design,digital design,modular design,reliability optimization design,***,three key scientific issues worthy of research in the future are indicated,and five research trends of“newer,better,smarter,faster,and greener”are summarized,aiming to provide references for the equipment design and manufacturing industry.

关键词： Product design Design theory and method Innovative design Digital design

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微观几何设计制造的关键技术与工程应用

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机械工程学报 2024年第13期60卷 268-280页

作者：刘振宇陈轲文裘辿李明张雨豪谭建荣彭群生浙江大学计算机辅助设计与图形系统全国重点实验室杭州310058

近年来,高端装备制造技术朝着极高精度、极高性能与极限尺度方向迅猛发展,对几何学提出了一系列新的问题和需求。微观几何学描述和刻画在表面或内部具有微小尺度细节的几何特征,为表征、设计、加工和测量微观特征提供了数学基础。本文... 详细信息

近年来,高端装备制造技术朝着极高精度、极高性能与极限尺度方向迅猛发展,对几何学提出了一系列新的问题和需求。微观几何学描述和刻画在表面或内部具有微小尺度细节的几何特征,为表征、设计、加工和测量微观特征提供了数学基础。本文阐述了微观几何的基本概念与内涵,分析了微观几何在微尺度建模、跨尺度关联和局部形状控制方面的特点。从微观几何的表示与建模、多物理场仿真、智能设计与优化、高精度制造、高效率测量等五个方面梳理了微观几何设计制造的关键技术,并凝练了微观几何设计制造亟需解决的宏观-微观耦合的几何表征、材料-结构-工艺-性能一体化设计、原子尺度的几何表征与测量等关键科学问题。最后介绍了作者团队在基于混合维的复杂零件真实表面建模、基于接触簇约束的复杂产品装配仿真与分析、复杂微孔结构建模与拓扑优化设计等方面的相关研究工作。

关键词：微观几何微观表面微观结构几何表征设计优化高精制造

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Multi-scale Simulation Method with Coupled Finite/Discrete Element Model and Its Application

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Chinese Journal of Mechanical Engineering 2013年第4期26卷 659-667页

作者： FANG Xiwu LIU Zhenyu TAN Jianrong qiu chan CHEN Fengbei State Key Laboratory of CAD&CG Zhejiang University Department of Mechanical Engineering Taizhou University The State Key Lab of Fluid Power Transmission and Control Zhejiang University

The existing research on continuous structure is usually analyzed with finite element method (FEM) and granular medium with discrete element method (DEM), but there are few researches on the coupling interaction between continuous structure and discrete medium. To the issue of this coupling interaction, a multi-scale simulation method with coupled finite/discrete element model is put forward, in their respective domains of discrete and finite elements, the nodes follow force law and motion law of their own method, and on the their interaction interface, the touch type between discrete and finite elements is distinguished as two types: full touch and partial touch, the interaction force between them is calculated with linear elastic model. For full touch, the contact force is proportional to the overlap distance between discrete element and finite element patch. For partial touch, first the finite element patch is extended on all sides indefinitely to be a complete plane, the full contact force can be obtained with the touch type between discrete element and plane being viewed as full touch, then the full overlap area between them and the actual overlap area between discrete element and finite element patch are computed, the actual contact force is obtained by scaling the full contact force with a factor which is determined by the ratio of the actual overlap area to the full overlap area. The contact force is equivalent to the finite element nodes and the force and displacement on the nodes can be computed, so the ideal simulation results can be got. This method has been used to simulate the cutter disk of the earth pressure balance shield machine (EPBSM) made in North Heavy Industry (NHI) with its excavation diameter of 6.28 m cutting and digging the sandy clay layer. The simulation results show that as the gradual increase of excavating depth of the cutter head, the maximum stress occurs at the roots of cutters on the cutter head, while for the soil, the largest st

关键词： multi-scale finite element discrete element linear elastic model

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Assembly variation analysis of flexible curved surfaces based on Bézier curves

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Frontiers of Information Technology & Electronic Engineering 2018年第6期19卷 796-808页

作者： Zhen-yu LIU Shi-en ZHOU Jin CHENG chan qiu Jian-rong TAN State Key Lab of CAD & CG Zhejiang University

Assembly variation analysis of parts that have flexible curved surfaces is much more difficult than that of solid bodies, because of structural deformations in the assembly process. Most of the current variation analysis methods either neglect the relationships among feature points on part surfaces or regard the distribution of all feature points as the same. In this study, the problem of flexible curved surface assembly is simplified to the matching of side lines. A methodology based on Bézier curves is proposed to represent the side lines of surfaces. It solves the variation analysis problem of flexible curved surface assembly when considering surface continuity through the relations between control points and data points. The deviations of feature points on side lines are obtained through control point distribution and are then regarded as inputs in commercial finite element analysis software to calculate the final product deformations. Finally, the proposed method is illustrated in two cases of antenna surface assembly.

关键词： Assembly variation analysis Feature points Side lines Flexible curved surfaces Bezier curves

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Turning machining induced microstructural stability of a high Nb-containing TiAl alloy during high temperature exposure

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Rare Metals 2016年第1期35卷 77-84页

作者： Lu Fang Jun-Pin Lin Xiao-chan qiu Jin-Xiao Ou Xian-Fei Ding State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing School of Architecture and Engineering Heilongjiang University National Center for Materials Service Safety University of Science and Technology Beijing

Turning machining induced microstructural instability was investigated in a fully lamellar Ti-45Al-8.5Nb-（W,B,Y） alloy during high temperature *** turning machining followed by thermal exposure at900 or 1000℃ for 100,300 and 500 h,a depth-dependent gradient microstructure with random orientations was produced in the region close to the machining *** typical layers,a fine-grained（FG） layer with equiaxed grains and a coarse-grained（CG） layer with elongated grains,are formed in this region in transversal *** thickness of the two layers is up to 120 urn after thermal exposure at 1000℃ for 500 h,which is less than the depth of the hardened region（200 μm） after turning *** of the new grains in FG and CG layers are constituted of γ single phase,while short α_2 segments and few B2 particles are precipitated at the γ/γ interface or inside the γ *** and phase boundary bulging are found to be the major mechanisms responsible for lamellar degradation in FG layer and CG layer,*** residual deformation energy stored is considered to be the main driving force of this process.

关键词： High Nb-containing TiAl alloy Residualdeformation energy Microstructural instability Recrystallization Phase transformation

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Digital assembly technology based on augmented reality and digital twins: a review

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Virtual Reality & Intelligent Hardware 2019年第6期1卷 597-610页

作者： chan qiu Shien ZHOU Zhenyu LIU Qi GAO Jianrong TAN State Key Laboratory of CAD and CG Zhejiang UniversityHangzhou 310027China

Product assembly simulation is considered as one of the key technologies in the process of complex product design and *** assembly realizes the assembly process design,verification,and optimization of complex products in the virtual environment,which plays an active and effective role in improving the assembly quality and efficiency of complex *** recent years,augmented reality(AR)and digital twin(DT)technology have brought new opportunities and challenges to the digital assembly of complex products owing to their characteristics of virtual reality fusion and interactive *** paper expounds the concept and connotation of AR,enumerates a typical AR assembly system structure,analyzes the key technologies and applications of AR in digital assembly,and notes that DT technology is the future development trend of intelligent assembly research.

关键词： Augmented reality Digital twin Digital assembly Virtual simulation Assembly analysis

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硅对锰-铅复合胁迫下水稻幼苗叶片细胞壁多糖组分中锰和铅含量的影响

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西南农业学报 2024年第8期37卷 1809-1815页

作者：韦丹蒙黄秋婵兰娟梁海红黄自如朱思凤广西民族师范学院

【目的】探究不同浓度SiO2对锰-铅（Mn-Pb）复合胁迫下水稻幼苗叶片细胞壁多糖组分中Mn和Pb含量的影响，为利用农艺措施治理矿区农田重金属复合污染提供理论依据。【方法】在模拟矿区重金属污染前提下，先用水培法将水稻种子培养至5叶1... 详细信息

【目的】探究不同浓度SiO2对锰-铅（Mn-Pb）复合胁迫下水稻幼苗叶片细胞壁多糖组分中Mn和Pb含量的影响，为利用农艺措施治理矿区农田重金属复合污染提供理论依据。【方法】在模拟矿区重金属污染前提下，先用水培法将水稻种子培养至5叶1心期，然后用2 mmol/L Mn2++2 mmol/L Pb2+溶液复合胁迫水稻幼苗。设6个不同的SiO2处理浓度：0（对照，CK）、70、90、110、130和150 mg/L。处理后提取水稻幼苗叶片细胞壁多糖组分，测定和分析其中Mn和Pb含量。【结果】施加SiO2增加细胞壁多糖组分（果胶质、半纤维素和纤维素）中Mn和Pb含量。与CK相比，当SiO2浓度为70～110 mg/L时，细胞壁果胶质中Mn和Pb含量较高；SiO2处理下果胶质中Pb含量大于Mn含量，当SiO2浓度小于90 mg/L时，水稻幼苗叶片细胞壁中Pb含量小于Mn含量。SiO2浓度为110 mg/L时，在半纤维素和纤维素中Mn和Pb含量均较高；水稻幼苗叶片细胞壁半纤维素中Pb含量大于Mn含量，SiO2浓度小于90 mg/L时，纤维素中Pb含量为负值。未施加SiO2时，Mn和Pb的主要结合位点分别为纤维素和果胶质，施加SiO2使Pb的主要结合位点转移为半纤维素。【结论】SiO2能增加重金属Mn和Pb在细胞壁多糖组分中的含量。Mn-Pb复合胁迫下，SiO2浓度为110 mg/L时，Mn和Pb的含量在细胞壁、果胶质、半纤维素和纤维素中均较多。

关键词：硅锰-铅复合胁迫水稻细胞壁多糖组分

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