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From blocker to booster:Harnessing garnet surface chemistry for advanced solid-state electrolytes

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Nano Research 2025年第1期18卷 323-331页

作者： jun cheng Xuan Zhou Hongqiang Zhang Zhen Zeng Yuanyuan Li Yulong Zhu Yingsheng Liao Lijie Ci Deping Li State Key Laboratory of Precision Welding and Joining of Materials and Structures School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China

Garnet electrolytes with high ionic conductivity and electrochemical stability are widely used as fillers to fabricate composite solid electrolytes(CPEs)within polymer ***,the performance of CPEs is significantly influenced by the surface characteristics of the garnet ***,the impact of garnet surface characteristics on CPEs was systematically investigated and a conversion from a typically unstable and Lewis basic surface to a more stable Lewis acidic surface was realized,which is shown to be more conductive to the improved performance of *** simultaneously removing the Li_(2)CO_(3)layer and applying a Li-Al-O coating,the influence of surface characteristics on CPEs was *** Lewis acid Li-Al-O surface coating not only promotes lithium salt dissociation,improving the ionic conductivity and ionic transfer number,but also prevents the reformation of the passive Lewis basic Li_(2)CO_(3)*** to garnet with a Lewis basic Li_(2)CO_(3)surface,the garnet modified with a Lewis acid Li-Al-O coating enhances CPEs,which exhibit an improved critical current density of 1.0 mA·cm^(-2)and highly stable lithium symmetric cell cycling for 400 h at 0.2 mA·cm^(-2).This research highlights the importance of surface chemistry in the design of high-performance solid-state batteries and presents a strategic modification approach for garnetbased CPEs.

关键词： garnet electrolyte composite solid electrolyte surface chemistry all-solid-state batteries

Foldcore Structures with Origami Initiators for Energy-Absorbing Sandwich Panels

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Acta Mechanica Solida Sinica 2023年第4期36卷 491-505页

作者： jun cheng Yang Li The Institute of Technological Sciences Wuhan UniversityWuhan 430072China Wuhan University Shenzhen Research Institute Shenzhen 518057China

Origami foldcore structures can be used in thin-walled sandwich panels to provide unique advantages over traditional honey-comb *** instance,their continuously connected space is available for flowing through cooling liquid or compact pipeline ***,origami foldcores suffer from relatively low-energy *** paper proposes a new design of energy-absorbing foldcore structures for sandwich panels,including the geometric design,experimental tests,numerical parametric study,and theoretical estimation of energy *** initiators are introduced to the Miura foldcores to induce a failure mode with more transverse folds,which is not common for regular foldcore *** a result,60%higher energy absorption and tunable load uniformity can be achieved.

关键词： Thin-walled structures Sandwich panels Energy absorption Origami Foldcores

The Pressure in Operator Algebras

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Acta Mathematica Sinica,English Series 2008年第6期24卷 983-996页

作者： cheng jun HOU Department of Mathematics Qufu Normal University Qufu 273165 P. R. China

We introduce two notions of the pressure in operator algebras, one is the pressure Pα（π, T） for an automorphism α of a unital exact C^＊-algebra A at a self-adjoint element T in A with respect to a faithful unital ＊-representation π the other is the pressure Pτ,α（T） for an automorphism α of a hyperfinite von Neumann algebra M at a self-adjoint element T in M with respect to a faithful normal α-invariant state τ. We give some properties of the pressure, show that it is a conjugate invaxiant, and also prove that the pressure of the implementing inner automorphism of a crossed product A×α Z at a self-adjoint operator T in A equals that of α at T.

关键词： exact C^*-algebra hyperfinite von Neumann algebra entropy pressure crossed product

Spectral Invariant Subalgebras of Reduced Groupoid C^＊-algebras

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Acta Mathematica Sinica,English Series 2017年第4期33卷 526-544页

作者： cheng jun HOU School of Mathematical Sciences Yangzhou University Yangzhou 225002 P. R. China

We introduce the notion of property(RD) for a locally compact, Hausdorff and r-discrete groupoid G, and show that the set S~l(G) of rapidly decreasing functions on G with respect to a continuous length function l is a dense spectral invariant and Fréchet *-subalgebra of the reduced groupoid C~*-algebra C~*(G) of G when G has property(RD) with respect to l, so the K-theories of both algebras are isomorphic under inclusion. Each normalized cocycle c on G, together with an invariant probability measure on the unit space G~0 of G, gives rise to a canonical map τon the algebra C(G) of complex continuous functions with compact support on G. We show that the map τcan be extended continuously to S~l(G) and plays the same role as an n-trace on C~*(G) when G has property(RD) and c is of polynomial growth with respect to l, so the Connes’ fundament paring between the K-theory and the cyclic cohomology gives us the K-theory invariants on C~*(G).

关键词： Groupoid C*-algebra property(RD) spectral invariance

基于通风网络解算的矿井智能通风监控系统设计

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煤矿机械 2025年第1期46卷 30-34页

作者：程军张泉王成李虎安徽恒源煤电股份有限公司钱营孜煤矿安徽宿州234100

针对传统通风系统存在风量供需不平衡、通风能耗高及可控性差等问题,结合矿井通风理论和通风网络解算技术,提出一套矿井智能通风监控系统。该系统通过井下监控分站读取智能传感设备中的环境参数,并通过以太网通信协议将数据上传至地面... 详细信息

针对传统通风系统存在风量供需不平衡、通风能耗高及可控性差等问题,结合矿井通风理论和通风网络解算技术,提出一套矿井智能通风监控系统。该系统通过井下监控分站读取智能传感设备中的环境参数,并通过以太网通信协议将数据上传至地面远程监控中心,在用户界面中提供数据终端显示,实现矿井通风的实时监测、远程调控、故障预警和智能决策等功能。该系统采用Cross迭代法进行通风网络的风量解算,计算矿井各分支的可调风量,优化通风网络风量,输出最优风量调节方案。应用测试表明,该系统能够智能选取调风策略,满足不同分支的实际通风需求,提高了矿井通风系统的安全性和可靠性,为矿井通风的智能管理提供有效方案。

关键词：智能通风监控系统风量调节远程控制

Deflagration and detonation induced by shock wave focusing at different Mach numbers

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Chinese Journal of Aeronautics 2024年第2期37卷 249-258页

作者： Zezhong YANG jun cheng Bo ZHANG School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China

Shock wave focusing is an effective way to create a hot spot or a high-pressure and hightemperature region at a certain place,showing its unique usage in detonation initiation,which is beneficial for the development of detonation-based *** flame propagation behavior after the autoignition induced by shock wave focusing is crucial to the formation and self-sustaining of the detonation *** this study,wedge reflectors with two different angles(60°and 90°)and a planar reflector are employed,and the Mach number of incident shock waves ranging from 2.0 to 2.8 is utilized to trigger different flame propagation *** pressure transducers and the high-speed schlieren imaging system are both employed to investigate the shock-shock collision and ignition *** results reveal a total of four flame propagation modes:deflagration,DDT(Deflagration-to-Detonation Transition),unsteady detonation,and direct *** detonation wave formed in the DDT and unsteady detonation mode is only approximately 75%-85%of the Chapman-Jouguet(C-J)speed;meanwhile,the directly induced detonation wave speed is close to the C-J *** waves,which are strong evidence for the existence of detonation waves,are discovered in *** usage of wedge reflectors significantly reduces the initial pressure difference ratio needed for direct detonation *** also provide a practical method for differentiating between detonation and deflagration modes,which involves contrasting the speed of the reflected shock wave with the speed of the theoretically nonreactive reflected shock *** findings should serve as a reference for the detonation initiation technique in advanced detonation propulsion engines.

关键词： Deflagration Detonation Hydrogen Ignition Shock wave focusing

子女代际支持对农村老年人生活满意度的影响研究

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江苏商论 2025年第1期 62-65,82页

作者：李成辉孙成军昆明理工大学管理与经济学院云南昆明650500

伴随中国农村人口老龄化程度加深,农村老年人的生活满意度问题成为学界关注的焦点。本研究基于CFPS数据库2020年的调查数据,运用有序logistic模型对此进行研究。研究发现:引入个人特征、医疗健康和家庭特征三类控制变量之后,子女对老人... 详细信息

伴随中国农村人口老龄化程度加深,农村老年人的生活满意度问题成为学界关注的焦点。本研究基于CFPS数据库2020年的调查数据,运用有序logistic模型对此进行研究。研究发现:引入个人特征、医疗健康和家庭特征三类控制变量之后,子女对老人的生活照料影响最大。此外,婚姻状况、教育程度、医疗条件、健康状况、子女数等因素也对农村老年人的生活满意度产生显著影响。研究结果有助于加深我们对农村老年人生活满意度的理解,并为改善农村养老质量提供有益的参考。

关键词：农村老年人子女代际支持生活满意度有序Logistic回归分析

Core-based Shared Tree Multicast Routing Algorithms for LEO Satellite IP Networks

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Chinese Journal of Aeronautics 2007年第4期20卷 353-361页

作者： cheng Lianzhen Zhang jun Liu Kai School of Electronics and lnformation Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

A new core-based shared tree algorithm, viz core-cluster combination-based shared tree （CCST） algorithm and the weighted version （i.e. w-CCST algorithm） are proposed in order to resolve the channel resources waste problem in typical source-based multicast routing algorithms in low earth orbit （LEO） satellite IP networks. The CCST algorithm includes the dynamic approximate center （DAC） core selection method and the core-cluster combination multicast route construction scheme. Without complicated onboard computation, the DAC method is uniquely developed for highly dynamic networks of periodical and regular movement. The core-cluster combination method takes core node as the initial core-cluster, and expands it stepwise to construct an entire multicast tree at the lowest tree cost by a shortest path scheme between the newly-generated core-cluster and surplus group members, which results in great bandwidth utilization. Moreover, the w-CCST algorithm is able to strike a balance between performance of tree cost and that of end-to-end propagation delay by adjusting the weighted factor to meet strict end-to-end delay requirements of some real-time multicast services at the expense of a slight increase in tree cost. Finally, performance comparison is conducted between the proposed algorithms and typical algorithms in LEO satellite IP networks. Simulation results show that the CCST algorithm significantly decreases the average tree cost against to the others, and also the average end-to-end propagation delay ofw-CCST algorithm is lower than that of the CCST algorithm.

关键词： satellite IP networks LEO multicast routing shared tree core

Modeling and Evaluating of Surface Roughness Prediction in Micro-grinding on Soda-lime Glass Considering Tool Characterization

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Chinese Journal of Mechanical Engineering 2013年第6期26卷 1091-1100页

作者： cheng jun GONG Yadong WANG Jinsheng School of Mechanical Engineering and Automation Northeastern University

The current research of micro-grinding mainly focuses on the optimal processing technology for different materials. However, the material removal mechanism in micro-grinding is the base of achieving high quality processing surface. Therefore, a novel method for predicting surface roughness in micro-grinding of hard brittle materials considering micro-grinding tool grains protrusion topography is proposed in this paper. The differences of material removal mechanism between convention grinding process and micro-grinding process are analyzed. Topography characterization has been done on micro-grinding tools which are fabricated by electroplating. Models of grain density generation and grain interval are built, and new predicting model of micro-grinding surface roughness is developed. In order to verify the precision and application effect of the surface roughness prediction model proposed, a micro-grinding orthogonally experiment on soda-lime glass is designed and conducted. A series of micro-machining surfaces which are 78 nm to 0.98 ~tm roughness of brittle material is achieved. It is found that experimental roughness results and the predicting roughness data have an evident coincidence, and the component variable of describing the size effects in predicting model is calculated to be 1.5x 107 by reverse method based on the experimental results. The proposed model builds a set of distribution to consider grains distribution densities in different protrusion heights. Finally, the characterization of micro-grinding tools which are used in the experiment has been done based on the distribution set. It is concluded that there is a significant coincidence between surface prediction data from the proposed model and measurements from experiment results. Therefore, the effectiveness of the model is demonstrated. This paper proposes a novel method for predicting surface roughness in micro-grinding of hard brittle materials considering micro-grinding tool grains protrusion topo

关键词： micro-grinding tool topography characterization soda-lime glass surface roughness prediction