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教育元宇宙背景下学前教育技术伦理的隐忧与化解

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兵团教育学院学报 2024年第3期34卷 29-35,59页

作者：侍玉昊四川轻化工大学教育与心理科学学院四川自贡643000

在教育元宇宙的背景下学前教育虽然发生诸多变革,但是仍将面对新的挑战。在从理念、场域和主体角度解构教育元宇宙的基础上,教育元宇宙赋能学前教育的技术伦理风险表征为体验的沉浸性使幼儿受困虚实混淆问题、身份的虚拟化使幼儿错过情... 详细信息

在教育元宇宙的背景下学前教育虽然发生诸多变革,但是仍将面对新的挑战。在从理念、场域和主体角度解构教育元宇宙的基础上,教育元宇宙赋能学前教育的技术伦理风险表征为体验的沉浸性使幼儿受困虚实混淆问题、身份的虚拟化使幼儿错过情感的启蒙、技术的数智化使幼儿难以说“不”、虚拟的自由度使幼儿容易超脱行为自觉、信息数据的安全性使幼儿陷入理解负担。为了更好地应对新的挑战,处于技术伦理萌芽阶段的学前教育应当通过体力劳动的过程、群体活动的在场、语言对话的互动和美育意识的培植化解其隐忧,并在审视技术应用的基础上开发适于幼儿发展的系统模式,从而实现教育元宇宙与学前教育的自然融合,以沉思之思的态度促进学前教育的良性变革。

关键词：教育元宇宙学前教育技术风险

基于双钙钛矿Nd_(1-x)La_(x)Ba_(0.5)Sr_(0.5)Fe_(2O)_(6-δ)纳米纤维阴极材料固体氧化物燃料电池性能研究

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吉林师范大学学报（自然科学版） 2024年第3期45卷 26-35页

作者：王立忠刘健博吕世权魏宇霖石烨辉于仕豪张蓝航吉林师范大学信息技术学院吉林四平136000 韩山师范学院材料科学与工程学院广东潮州521041 长春信息技术职业学院汽车机电学院吉林长春130103

作为一种经典的高性能阴极材料,双钙钛矿阴极材料在中低温(500~700℃)范围能够展示出高效的催化活性和良好的氧离子-电子混合导电性.其中,铁基双钙钛矿具有成本低、转换效率高、热相容性好和高温稳定性好等优点而备受青睐.本文通过采用... 详细信息

作为一种经典的高性能阴极材料,双钙钛矿阴极材料在中低温(500~700℃)范围能够展示出高效的催化活性和良好的氧离子-电子混合导电性.其中,铁基双钙钛矿具有成本低、转换效率高、热相容性好和高温稳定性好等优点而备受青睐.本文通过采用静电纺丝技术和A位掺杂机制相结合的方法成功制备出Nd_(1-x)La_(x)Ba_(0.5)Sr_(0.5)Fe_(2O)_(6-δ)(x=0,0.1,0.2,0.3)纳米纤维阴极双钙钛矿材料.对于NdBa_(0.5)Sr_(0.5)Fe_(2)O_(6-δ)纳米纤维阴极材料来讲,在其A位引入部分La 3+可以使其阴极材料获得更高的氧空位浓度,从而显著提高了阴极材料所制备单电池的电化学性能.Nd_(0.9)La_(0.1)Ba_(0.5)Sr_(0.5)Fe_(2)O_(6-δ)纳米纤维材料作为阴极的单电池在700℃时峰值功率密度(PPD)为623 mW/cm^(2),明显高于NdBa_(0.5)Sr_(0.5)Fe_(2)O_(6-δ)纳米纤维材料在同样条件下的215 mW/cm^(2)的峰值功率密度,其在700℃的阻抗值(R p)为0.17Ω·cm^(2),也远低于NdBa_(0.5)Sr_(0.5)Fe_(2)O_(6-δ)纳米纤维阴极材料在同样条件下的0.43Ω·cm^(2)的阻抗值.

关键词： SOFC阴极纳米纤维材料 A位掺杂 Fe基双钙钛矿材料

Interaction Mechanisms between Natural Debris Flow and Rigid Barrier Deflectors:A New Perspective for Rational Design and Optimal Arrangement

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 1679-1699页

作者： yu Huang Beilei Liu Dianlei Feng hao shi Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Department of Hydraulic Engineering College of Civil EngineeringTongji UniversityShanghai200092China

Rigid barrier deflectors can effectively prevent overspilling landslides,and can satisfy disaster prevention ***,the mechanisms of interaction between natural granular flow and rigid barrier deflectors require further *** date,few studies have investigated the impact of deflectors on controlling viscous debris flows for geological disaster *** investigate the effect of rigid barrier deflectors on impact mechanisms,a numerical model using the smoothed particle hydrodynamics(SPH)method with the Herschel–Bulkley model is proposed to simulate the interaction between natural viscous flow and single/dual barriers with and without *** model was validated using laboratory flume test data from the ***,the model was used to investigate the influence of the deflector angle and multi-barrier *** optimal configuration of multi-barriers was analyzed with consideration to the barrier height and distance between the barriers,because these metrics have a significant impact on the viscous flow pile-up,run-up,and overflow *** investigation considered the energy dissipation process,retention efficiency,and dead-zone *** with bare barriers with similar geometric characteristics and spatial distribution,rigid barriers with deflectors exhibit superior effectiveness in preventing the overflow and overspilling of viscous debris *** for the rational design of deflectors and the optimal arrangement of multi-barriers are provided to mitigate geological disasters.

关键词： Rigid barrier deflectors deflector angle single-barrier dual-barrier arrangements viscous debris flow over-spilling delta-plus-SPH

Deep Learning and Tensor-Based Multiple Clustering Approaches for Cyber-Physical-Social Applications

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Computers, Materials & Continua 2024年第3期78卷 4109-4128页

作者： Hongjun Zhang hao Zhang yu Lei hao Ye Peng Li Desheng shi School of Computer Science Nanjing University of Posts and TelecommunicationsNanjing210023China China Communications Services Co. Ltd.Beijing100071China China Communications Services Hexin Science&Technology Co. Ltd.Hefei230031China

The study delves into the expanding role of network platforms in our daily lives, encompassing various mediums like blogs, forums, online chats, and prominent social media platforms such as Facebook, Twitter, and Instagram. While these platforms offer avenues for self-expression and community support, they concurrently harbor negative impacts, fostering antisocial behaviors like phishing, impersonation, hate speech, cyberbullying, cyberstalking, cyberterrorism, fake news propagation, spamming, and fraud. Notably, individuals also leverage these platforms to connect with authorities and seek aid during disasters. The overarching objective of this research is to address the dual nature of network platforms by proposing innovative methodologies aimed at enhancing their positive aspects and mitigating their negative repercussions. To achieve this, the study introduces a weight learning method grounded in multi-linear attribute ranking. This approach serves to evaluate the significance of attribute combinations across all feature spaces. Additionally, a novel clustering method based on tensors is proposed to elevate the quality of clustering while effectively distinguishing selected features. The methodology incorporates a weighted average similarity matrix and optionally integrates weighted Euclidean distance, contributing to a more nuanced understanding of attribute importance. The analysis of the proposed methods yields significant findings. The weight learning method proves instrumental in discerning the importance of attribute combinations, shedding light on key aspects within feature spaces. Simultaneously, the clustering method based on tensors exhibits improved efficacy in enhancing clustering quality and feature distinction. This not only advances our understanding of attribute importance but also paves the way for more nuanced data analysis methodologies. In conclusion, this research underscores the pivotal role of network platforms in contemporary society, emp

关键词： Network platform tensor-based clustering weight learning multi-linear euclidean

A new fabrication method for enhancing the yield of linear micromirror arrays assisted by temporary anchors

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Microsystems & Nanoengineering 2024年第3期10卷 169-180页

作者： Xingchen Xiao Ting Mao Yingchao shi Kui Zhou Jia hao Yiting yu Ningbo Institute of Northwestern Polytechnical University College of Mechanical EngineeringNorthwestern Polytechnical University710072 Xi’anChina Key Laboratory of Micro/Nano Systems for Aerospace(Ministry of Education) Shaanxi Province Key Laboratory of Micro and Nanoelectromechanical SystemsNorthwestern Polytechnical University710072 Xi’anChina

As one of the most common spatial light modulators,linear micromirror arrays(MMAs)based on microelectromechanical system(MEMS)processes are currently utilized in many ***,two crucial challenges exist in the fabrication of such devices:the adhesion of silicon microstructures caused by anodic bonding and the destruction of the suspended silicon film due to residual *** solve these issues,an innovative processing method assisted by temporary anchors is *** approach effectively reduces the span of silicon microstructures and improves the Euler buckling limit of the silicon ***,these temporary anchors are strategically placed within the primary etching areas,enabling easy removal without additional processing *** a result,we successfully achieved wafer-level,high-yield manufacturing of linear MMAs with a filling factor as high as 95.1%.Demonstrating superior capabilities to those of original MMAs,our enhanced version boasts a total of 60 linear micromirror elements,each featuring a length-to-width ratio of 52.6,and the entire optical aperture measures 5 mm×6 *** linear MMA exhibits an optical deflection angle of 20.4°at 110 Vdc while maintaining exceptional deflection flatness and *** study offers a viable approach for the design and fabrication of thin-film MEMS devices with high yields,and the proposed MMA is promising as a replacement for digital micromirror devices(DMDs,by TI Corp.)in fields such as spectral imaging and optical communication.

关键词： mirror exceptional anodic

Highly efficient labelling of extracellular vesicles for enhanced detection on a microfluidic platform

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Chinese Chemical Letters 2024年第2期35卷 441-445页

作者： shi Hu Rui hao Zitong yu Huitao Zhang Hui Yang Bionic Sensing and Intelligence Center Institute of Biomedical and Health EngineeringShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China

Developing precise extracellular vesicles(EVs)labelling techniques with minimal disturbance is of great importance to the follow-up EVs detection and ***,currently available methods such as using probes to conjugate phospholipids or membrane proteins have certain limitations due to EV steric hindrance,dye aggregation,***,we present a microfluidic platform to enhance EVs’labelling efficiency and improve their *** platform provides excellent sample throughput and high-efficiency EV labelling at lower label concentrations with an optimized flowing *** cytometry analysis(FCM)and cellular uptake results show that EV labelling by utilizing this platform possesses the merits of a higher labelling efficiency with 64.1%relative improvement than conventional co-incubation method and a lower background ***,this technique maintains EVs’size,morphology and biological *** the recipient cells uptake the EVs treated by the microfluidic platform,the spatial and temporal distribution of EVs in the cells are clearly *** results demonstrate that our method holds great potential in efficient labelling of EVs,which is essential to subsequent EV quantification and analysis.

关键词： Microfluidic platform Extracellular vesicles Labelling PKH dye Flow cytometry

Matrix orthogonal polynomials,non-abelian Toda lattices,and Bäcklund transformations

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Science China Mathematics 2024年第9期67卷 2071-2090页

作者： shi-hao Li Department of Mathematics Sichuan UniversityChengdu 610064China

A connection between matrix orthogonal polynomials and non-abelian integrable lattices is investigated in this *** normalization factors of matrix orthogonal polynomials expressed using quasideterminants are shown to be the solutions to the non-abelian Toda lattice in semi-discrete and full-discrete ***,with a moment modification method,we demonstrate that the B¨acklund transformation of the non-abelian Toda lattice given by Popowicz(1983)is equivalent to the non-abelian Volterra lattice,whose solutions can be expressed using quasi-determinants as well.

关键词： matrix orthogonal polynomial non-abelian Toda lattice Backlund transformation quasideterminant technique

Equivalent linear model for seismic damage evaluation of single-degree-of-freedom systems representing reinforced concrete structures considering cyclic degradation behavior

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 637-648页

作者： Lulu Yan Ding-hao yu Research Center for Geotechnical and Structural Engineering Technology of Liaoning Province Dalian UniversityDalian116622China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China

In this study,a novel equivalent damping ratio model that is suitable for reinforced concrete(RC)structures considering cyclic degradation behavior is developed,and a new equivalent linearization analysis method for implementing the proposed equivalent damping ratio model for use in seismic damage evaluation is *** this end,Ibarra’s peak-oriented model,which incorporates an energy-based degradation rule,is selected for representing hysteretic behavior of RC structure,and the optimized equivalent damping for predicting the maximum displacement response is presented by using the empirical method,in which the effect of cyclic degradation is ***,the relationship between the hysteretic energy dissipation of the inelastic system and the elastic strain energy of the equivalent linear system is established so that the proposed equivalent linear system can be directly integrated with the Park-Ang seismic model to implement seismic damage *** to the simplicity of the equivalent linearization method,the proposed method provides an efficient and reliable way of obtaining comprehensive insight into the seismic performance of RC *** verification demonstrates the validity of the proposed method.

关键词： degrading system equivalent linear system equivalent damping seismic damage RC structures

The Enhanced Period Map and Equivariant Deformation Quantizations of Nilpotent Orbits

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Acta Mathematica Sinica,English Series 2024年第3期40卷 885-934页

作者： shi Lin yu Department of Mathematics School of Mathematical SciencesXiamen UniversityXiamen 361005P.R.China

In a previous paper,the author and his collaborator studied the problem of lifting Hamil-tonian group actions on symplectic varieties and Lagrangian subvarieties to their graded deformation quantizations and apply the general results to coadjoint orbit method for semisimple Lie *** even quantizations were considered *** this paper,these results are generalized to the case of general quantizations with arbitrary *** key step is to introduce an enhanced version of the(truncated)period map defined by Bezrukavnikov and Kaledin for quantizations of any smooth sym-plectic variety X,with values in the space of Picard Lie algebroid over *** an application,we study quantizations of nilpotent orbits of real semisimple groups satisfying certain codimension condition.

关键词： Coadjoint orbit method deformation quantization Harish-Chandra modules semisimple Liegroups