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Temperature-Dependent Tearing Behavior of Rubber Materials:Characterization and Modeling

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Acta Mechanica Solida Sinica 2024年第2期37卷 316-326页

作者： Qinyuan Yao feilong zhang Pan Dong Ziyuan Zhao Yi He Weiguo Li Liming Chen State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400044China College of Aerospace Engineering Chongqing UniversityChongqing400044China

With the increasingly widespread application of rubber in many fields,there is a growing demand for quantitative characterization of temperature-dependent mechanical properties in high-temperature service *** critical tearing energy is an important criterion for determining whether rubber materials will experience tearing instability,while tear strength is a key parameter for rubber materials to resist *** is necessary to quantitatively characterize their evolution with *** theoretical research mainly relies on fitting a large amount of experimental data,which is not convenient for engineering ***,in this work,a temperature-dependent critical tearing energy model is firstly developed based on the force-heat equivalence energy density *** model considers the equivalent relationship between the critical tearing energy required for crack instability propagation and the thermal energy stored in the rubber *** is demonstrated that our model has higher prediction accuracy when compared to other ***,combining with the Griffith fracture theory,temperature-dependent tear strength models applicable to three different crack modes are separately *** models are validated using experimental data for Mode I opening cracks and ModeⅢtearing cracks,and good consistency is ***,a quantitative analysis of the influence of elastic modulus on tear strength at different temperatures is *** work provides a reliable way for predicting temperature-dependent tearing instability behavior and offers beneficial suggestions for improving the tear strength of rubber materials at different temperatures.

关键词： Temperature-dependent Critical tearing energy Tear strength Rubber Theoretical model

Overhead-free Noise-tolerant Federated Learning: A New Baseline

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Machine Intelligence Research 2024年第3期21卷 526-537页

作者： Shiyi Lin Deming Zhai feilong zhang Junjun Jiang Xianming Liu Xiangyang Ji Department of Computer Science and Technology Harbin Institute of TechnologyHarbin150000China Department of Automation Tsinghua UniversityBeijing100084China

Federated learning (FL) is a promising decentralized machine learning approach that enables multiple distributed clients to train a model jointly while keeping their data private. However, in real-world scenarios, the supervised training data stored in local clients inevitably suffer from imperfect annotations, resulting in subjective, inconsistent and biased labels. These noisy labels can harm the collaborative aggregation process of FL by inducing inconsistent decision boundaries. Unfortunately, few attempts have been made towards noise-tolerant federated learning, with most of them relying on the strategy of transmitting overhead messages to assist noisy labels detection and correction, which increases the communication burden as well as privacy risks. In this paper, we propose a simple yet effective method for noise-tolerant FL based on the well-established co-training framework. Our method leverages the inherent discrepancy in the learning ability of the local and global models in FL, which can be regarded as two complementary views. By iteratively exchanging samples with their high confident predictions, the two models “teach each other” to suppress the influence of noisy labels. The proposed scheme enjoys the benefit of overhead cost-free and can serve as a robust and efficient baseline for noise-tolerant federated learning. Experimental results demonstrate that our method outperforms existing approaches, highlighting the superiority of our method.

关键词： Federated learning noise-label learning privacy-preserving machine learning edge intelligence distributed machine learning

Water-Excluding Underwater Glue Induced by Marangoni Effect

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CCS Chemistry 2024年第5期6卷 1289-1299页

作者： Ke zhang Xizi Wan Zi-Yu Liu feilong zhang Jingwei Lu Jingxin Meng Ye Tian Haeshin Lee Lei Jiang Shutao Wang CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190 Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001 University of Chinese Academy of Sciences Beijing 100049 Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190 Beijing Key Laboratory for Bioengineering and Sensing Technology School of Chemistry and Biological EngineeringUniversity of Science and Technology BeijingBeijing 100083 The Graduate School of Nanoscience and Technology Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141

Marangoni effect at the two-phase interface with different surface tension as a unique mass transfer phenomenon has been widely used in daily life and ***,their marvelous liquid-driving capability between miscible liquids has long been ignored,especially in water ***,we first reveal a distinct underwater Marangoni effect between the solvent of glues and the water layer on solid *** by the Marangoni effect,organic solvents with water solubility,high dielectric constant,and low diffusivity could effectively exclude the interfacial water layer,enabling direct and effective contact between glues and solid *** experimental results and theoretical simulation proved that a relatively large ratio of the Marangoni number in the horizontal direction and to the vertical direction ensured an effective underwater adhesion of the water-excluding *** surface engineering approach provides an alternative to the traditional methods of molecular engineering for realizing underwater adhesion.

关键词： Marangoni effect underwater adhesion dynamic water-excluding water layer solvent diffusion

西藏高原粮油作物曲霉菌污染及菌株产毒力研究

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中国粮油学报 2024年第2期39卷 31-37页

作者：魏娜张飞龙西藏自治区农牧科学院农业质量标准与检测研究所拉萨850032

为探明西藏高原粮油作物曲霉菌污染状况及黄曲霉菌产毒能力,连续5年对西藏青稞、小麦、花生3种作物中曲霉菌污染情况进行分析,并对其分离到的黄曲霉菌株开展产毒力研究,结果表明,204份样品中,共分离出15种曲霉菌,曲霉菌污染率呈花生>青... 详细信息

为探明西藏高原粮油作物曲霉菌污染状况及黄曲霉菌产毒能力,连续5年对西藏青稞、小麦、花生3种作物中曲霉菌污染情况进行分析,并对其分离到的黄曲霉菌株开展产毒力研究,结果表明,204份样品中,共分离出15种曲霉菌,曲霉菌污染率呈花生>青稞>小麦。青稞、小麦中曲霉属优势种均为黑曲霉(Aspergillus niger),真菌毒素主要为杂色曲霉毒素和赭曲霉毒素;花生优势种为黄曲霉(***);仅受黄曲霉毒素污染。来源于不同作物的黄曲霉菌,其产毒类型也有差异,麦类作物产毒菌株以产黄曲霉毒素B_(1)(AFB_(1))、黄曲霉毒素B_(2)(AFB_(2))为主;花生产毒菌株以产AFB_(1)、AFB_(2)、AFG_(1)、AFG_(2)为主。

关键词：青稞小麦花生曲霉菌黄曲霉毒素产毒力

参与国家重大科技项目提高理工科研究生科研能力的路径研究

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中国科技论坛 2024年第1期 105-115页

作者：张飞龙马永红张凤北京航空航天大学人文社会科学学院(公共管理学院) 北京100191 北京市哲学社会科学研究生教育改革与发展研究基地北京100191

参与国家重大科技项目是培养高水平科技人才的重要方式。通过对参与国家重大科技项目理工科研究生的质性研究发现,项目情境预设了科研能力提高的可能性,为理工科研究生科研能力训练提供强有力的组织与资源保障。在参与项目过程中,理工... 详细信息

参与国家重大科技项目是培养高水平科技人才的重要方式。通过对参与国家重大科技项目理工科研究生的质性研究发现,项目情境预设了科研能力提高的可能性,为理工科研究生科研能力训练提供强有力的组织与资源保障。在参与项目过程中,理工科研究生科研能力从内源性和外源性两方面有实质性提高,同时报国情怀、持之以恒、忘我专注等价值观得到强化,这反过来为科研能力注入新的内生动力,项目情境、参与过程、价值追求之间形成良性互动,从而实现相互促进、动态提升的效果。据此,加强理工科研究生有组织地参与国家重大科技项目,把好育人“生命线”,保护“自由空间”,注重“全面发展”,不仅有助于推动研究生教育高质量发展,更有助于培养大批党和国家需要的高水平科技人才。

关键词：国家重大科技项目理工科研究生科研能力高水平科技人才

Bioinspired Strategies for Stretchable Conductors

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Chemical Research in Chinese Universities 2023年第1期39卷 30-41页

作者： zhang feilong CHEN Xiaodong Innovative Center for Flexible Devices(iFLEX) Max Planck-NTU Joint Lab for Artificial SensesSchool of Materials Science and EngineeringNanyang Technological University50 Nanyang AvenueSingapore639798Singapore

Stretchable conductors are indispensable components of stretchable electronic devices,such as stretchable sensors,transistors,light-emitting diode arrays,solar cells,and so ***,most of the conductive materials are stiff with very low *** has evolved various strategies to realize stretchability,which give a lot of inspirations to the design and fabrication of stretchable *** herein summarized the nature’s strategies to realize stretchability and revealed the underlying *** that,the applications of these strategies in fabricating stretchable conductors are exemplified and the effects of some important parameters on the performances are ***,possible applications of these stretchable conductors are ***,critical issues in the stretchable conductors are discussed and several prospective exploration directions are provided.

关键词： Bioinspired strategy Stretchable Conductor

The Nano Research Young Innovators Awards in bio-inspired nanomaterials

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Nano Research 2024年第2期17卷 417-425页

作者： Jun Chen Shuotao Wang Department of Bioengineering University of CaliforniaLos AngelesLos AngelesCA 90095USA Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Nano Research Young Innovators(NR45)Awards are designed to acknowledge and celebrate the achievements of young researchers under 45 years of *** individuals have made significant contributions to the field of nanoscience and *** the inaugural NR45 Awards in 2018,the journal's editorial board has recognized over a hundred innovators specializing in nanobiotechnology,nano energy,two-dimensional materials,and *** focus of the 2023 NR45 Awards is on bioinspired nanomaterials,acknowledging thirty-three outstanding young innovators for their extraordinary contributions in developing these materials with applications spanning clean energy,human healthcare,monitoring,and disease treatments,as shown in *** extend our heartfelt congratulations to all the 33 NR45 Awardees in 2023!

关键词： journal materials contributions

水泥-粉煤灰胶结矸石充填材料的流变特性与固结机理

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有色金属工程 2024年第6期14卷 134-143页

作者：王小勇王照明许海龙张思达张飞龙陕西煤业化工集团陕西小保当矿业有限公司陕西榆林719302 陕西煤业化工集团神南矿业有限公司陕西榆林719302 陕西天地地质有限责任公司西安710054

将粉煤灰、水泥、煤矸石和水作为充填材料进行充填,既能实现固体废弃物的资源化利用,还能有效控制矿山地表沉降。研究针对胶结矸石充填材料进行了流变测试、力学性能测试以及水化特性试验,分别研究了矸石充填材料的流变特性、抗压强度... 详细信息

将粉煤灰、水泥、煤矸石和水作为充填材料进行充填,既能实现固体废弃物的资源化利用,还能有效控制矿山地表沉降。研究针对胶结矸石充填材料进行了流变测试、力学性能测试以及水化特性试验,分别研究了矸石充填材料的流变特性、抗压强度、水化产物以及微观结构。结果表明:当325普通硅酸盐水泥含量为15%、低钙粉煤灰掺量超20%、料浆质量浓度保持在77%以上时,所制备的矸石充填试样28 d龄期的最小抗压强度超4.229 MPa,可以为井下充填开采提供良好的顶板支撑。通过流变试验探究了粉煤灰掺量和料浆质量浓度变化对矸石充填料浆流变性能的影响,并得到了充填料浆所对应的流变参数以及流变方程拟合。此外,对矸石胶结充填材料的矿物成分、水化产物以及微观结构进行了研究。研究可为大宗固体废弃物在矿山充填领域应用提供一定的理论指导。

关键词：固废抗压强度流变特性水化特性固结机理

胞苷酸生产废水特种微生物筛选及处理效果研究

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