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Dynamics and vibration reduction performance of asymmetric tristable nonlinear energy sink

Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 389-406页

作者： Hongyan chen Youcheng ZENG Hu DING Siukai LAI Liqun chen School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina

With its complex nonlinear dynamic behavior,the tristable system has shown excellent performance in areas such as energy harvesting and vibration suppression,and has attracted a lot of *** this paper,an asymmetric tristable design is proposed to improve the vibration suppression efficiency of nonlinear energy sinks(NESs)for the first *** proposed asymmetric tristable NES(ATNES)is composed of a pair of oblique springs and a vertical ***,the three stable states,symmetric and asymmetric,can be achieved by the adjustment of the distance and stiffness asymmetry of the oblique *** governing equations of a linear oscillator(LO)coupled with the ATNES are *** approximate analytical solution to the coupled system is obtained by the harmonic balance method(HBM)and verified *** vibration suppression efficiency of three types of ATNES is *** results show that the asymmetric design can improve the efficiency of vibration reduction through comparing the chaotic motion of the NES oscillator between asymmetric steady *** addition,compared with the symmetrical tristable NES(TNES),the ATNES can effectively control smaller structural *** other words,the ATNES can effectively solve the threshold problem of TNES failure to weak ***,this paper reveals the vibration reduction mechanism of the ATNES,and provides a pathway to expand the effective excitation amplitude range of the NES.

关键词： asymmetric nonlinear energy sink(NES) tristable vibration control po-tential barrier

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不同贮藏温度条件下3个烟草品种花粉活力、形态及生理指标变化

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作物杂志 2020年第2期 112-118页

作者：潘磊许杰杨帅陈云松陈连红马文广玉溪中烟种子有限责任公司云南玉溪653100

以烟草品种***、Maryland 609和云烟85花粉为试验材料,研究不同贮藏温度条件下参试烟草品种花粉的活力、形态及相关生理指标的变化。以烟草品种***冻存花粉活力检测结果为例,在-196℃和-80℃保存条件下,花粉贮藏16个月后活力分别为0.64... 详细信息

以烟草品种***、Maryland 609和云烟85花粉为试验材料,研究不同贮藏温度条件下参试烟草品种花粉的活力、形态及相关生理指标的变化。以烟草品种***冻存花粉活力检测结果为例,在-196℃和-80℃保存条件下,花粉贮藏16个月后活力分别为0.64±0.06和0.65±0.09,与贮藏前0.66±0.04相比,未出现显著下降,而4℃贮藏的花粉在保存5个月后即丧失活力。花粉电镜图片显示,在-196℃和-80℃贮藏条件下,花粉形态仍然规则饱满,而4℃条件下贮藏16个月的花粉则发生皱缩、畸形,萌发沟扭曲。-196℃贮藏条件下***的花粉可溶性糖含量(309.276mg/g)、可溶性蛋白含量(55.216mg/g)、游离氨基酸总量(15.817μmol/mg)、脯氨酸含量(1.596mg/g)、超氧化物歧化酶(SOD)活性(4.284U/g)均显著高于4℃贮藏条件下的花粉;-80℃贮藏条件下花粉脯氨酸含量(1.626mg/g)和SOD活性(5.546U/g)高于-196℃(液氮)条件下贮藏的花粉,可能与不同温度下花粉冻结速度有关。结果表明,-196℃和-80℃条件下保存对烟草花粉的活力保持更有利。

关键词：烟草花粉贮藏花粉活力花粉形态游离氨基酸总量 SOD活性

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Progress and prospects of Mg-based amorphous alloys in azo dye wastewater treatment

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Journal of Magnesium and Alloys 2024年第3期12卷 873-889页

作者： Yanan chen Fengchun chen Liang Li chen Su Bo Song Hongju Zhang Shengfeng Guo Fusheng Pan School of Materials and Energy Southwest UniversityChongqing 400715China Analytical and Testing Center Southwest UniversityChongqing 400715China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Mg-based amorphous alloys exhibit efficient catalytic performance and excellent biocompatibility with a promising application probability,specifically in the field of azo dye wastewater ***,the problems like difficulty in preparation and poor cycling stability need to be *** present,Mg-based amorphous alloys applied in wastewater degradation are available in powder and *** amorphous alloy powder fabricated by ball milling has a high specific surface area,and its reactivity is thousands of times better than that of gas atomized alloy *** the development is limited due to the high energy consumption,difficult and costly process of powder *** single roller melt-spinning method is a new manufacturing process of amorphous alloy *** to amorphous powder,the specific surface area of amorphous ribbon is relatively lower,therefore,it is necessary to carry out surface modification to enhance *** is a way that can form a pore structure on the surface of the amorphous alloys,increasing the specific surface area and providing more reactive sites,which all contribute to the catalytic *** the optimal conditions for Mg-based amorphous alloys in wastewater degradation by adjusting amorphous alloy composition,choosing suitable method to preparation and surface modification,reducing cost,expanding the pH range will advance the steps to put Mg-based amorphous alloys in industrial environments into practice.

关键词： Mg-based amorphous alloys Azo dyes Dealloying Surface modification Wastewater degradation.

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A two-step multi-frequency receiver function inversion method for shallow crustal S-wave velocity structure and its application across the basin-mountain range belts in Northeast China

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Science China Earth Sciences 2024年第3期67卷 687-703页

作者： Ruihao YANG Xu WANG Ling chen Mingye FENG Qifu chen State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

A shallow crustal velocity structure(above 10 km depth) is essential for understanding the crustal structures and deformation and assessing the exploration prospect of natural resources, and also provides priori information for imaging deeper crustal and mantle structure. Passive-source seismic methods are cost-effective and advantageous for regional-scale imaging of shallow crustal structures compared to active-source methods. Among these passive methods, techniques utilizing receiver function waveforms and/or body-wave amplitude ratios have recently gained prominence due to their relatively high spatial resolution. However, in basin regions, reverberations caused by near-surface unconsolidated sedimentary layers often introduce strong non-uniqueness and uncertainty, limiting the applicability of such methods. To address these challenges, we propose a two-step inversion method that uses multi-frequency P-RF waveforms and P-RF horizontal-to-vertical amplitude ratios. Synthetic tests indicate that our two-step inversion method can mitigate the non-uniqueness of the inversion and enhance the stability of the results. Applying this method to teleseismic data from a linear seismic array across the sedimentary basins in Northeast China, we obtain a high-resolution image of the shallow crustal S-wave velocity structure along the array. Our results reveal significant differences between the basins and mountains. The identification of low-velocity anomalies(<2.8 km s^(-1)) at depths less than 1.0 km beneath the Erlian Basin and less than 2.5 km beneath the Songliao Basin suggests the existence of sedimentary layers. Moreover, the high-velocity anomalies(~3.4–3.8 km s^(-1)) occurring at depths greater than 7 km in the Songliao Basin may reflect mafic intrusions emplaced during the Early Cretaceous. Velocity anomaly distribution in our imaging result is consistent with the location of the major faults, uplifts, and sedimentary depressions, as well as active-source seismic res

关键词： Receiver function Frequency dependence Two-step inversion Shallow crustal velocity structures Unconsolidated sedimentary basins

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当代中国国际传播：受众特征与提升路径

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中国浦东干部学院学报 2022年第3期16卷 129-136+84页

作者：陈云松柳建坤南京大学社会学院哈尔滨工程大学人文社会科学学院

加强和改进国际传播，讲好中国故事，传播好中国声音，展示真实、立体、全面的中国，需要加强对国际受众的研究。本文总结梳理了当代中国国际传播的环境格局，揭示了受众在当代国际传播中的重要地位，并从文化差异、制度偏见、认知习惯... 详细信息

加强和改进国际传播，讲好中国故事，传播好中国声音，展示真实、立体、全面的中国，需要加强对国际受众的研究。本文总结梳理了当代中国国际传播的环境格局，揭示了受众在当代国际传播中的重要地位，并从文化差异、制度偏见、认知习惯、媒体传统、刻板印象等五个方面系统分析了当前我国国际传播的受众特征，提出了宏大叙事转向平凡琐事、国家情怀与世界理想融合以及淡化官方身份促进文化协作等三条提升我国国际传播效果的优化路径。

关键词：国际传播传播受众传播理论传播实践

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The growth ofβphase in Mg-Gd-Y-Ni alloy by experimental and first-principles study

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Journal of Magnesium and Alloys 2024年第2期12卷 506-515页

作者： Yiqiang Hao Lei Zhou Zhiqing chen Zhixian Zhao Bin chen School of Materials Science and Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghai200240China

The paper reports on the atomic investigation aboutβphase in Mg_(96)Gd_(2)Y_(1)Ni_(1) alloy by using the first-principles study and the high-angle annular dark-field scanning transmission electron microscope(HAADF-STEM)corrected by atomic *** using HAADF-STEM,the rectangularβphases were observed in the underage and peak aging stages in Mg_(96)Gd_(2)Y_(1)Ni_(1) ***βphase could be precipitated from the previously precipitatedβphase,and theβphase grew in steps when it was precipitated.A special transition structure of three atomic layer thicknesses was first observed at the edge of theβphase and the structure of this interface is probably as theβ/Mg_(1) interface for the analysis of thermodynamic characterization and electronic ***β'phase and theβ_(H) structure were precipitated only at the edge of the length directions of theβ***β'phase continues to grow into aβphase directly without the formation ofβ_(1) phase,resulting in an increase in the length of theβphase,which is discovered for the first time.

关键词： HAADF-STEM First-principles study Mg-Gd-Y-Ni alloy βphase Growth Interface

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基于互穿网络技术构筑环境友好型聚合物电解质膜及其电化学性能

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精细化工 2024年第5期41卷 1092-1100页

作者：冉云松陈怡刘阳松赵振强马先果贵州理工学院化学工程学院贵州贵阳550003 贵州省普通高等学校能源化学特色重点实验室贵州贵阳550003

以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为反应型乳化剂,丙烯酸丁酯(BA)、丙烯腈(AN)和丙烯酸(AA)为单体,利用互穿网络技术通过乳液聚合法制备了环境友好型聚合物电解质膜(M-ABAA),采用FTIR、XPS、SEM、TEM和TG对M-ABAA进行了表征;通过CV、... 详细信息

以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)为反应型乳化剂,丙烯酸丁酯(BA)、丙烯腈(AN)和丙烯酸(AA)为单体,利用互穿网络技术通过乳液聚合法制备了环境友好型聚合物电解质膜(M-ABAA),采用FTIR、XPS、SEM、TEM和TG对M-ABAA进行了表征;通过CV、EIS和充放电测试考察以M-ABAA为电解质膜组装的CR2032电池的电化学性能。结果表明,当m(AMPS)∶m(BA)∶m(AA)∶m(AN)=1∶3∶2∶2时,制备的M-ABAA(M2)的离子电导率为0.98 mS/cm,抗拉强度为7.53 MPa,断裂伸长率为90.4%,吸液率为150%,热收缩率为4%。M2与目前锂离子电池主流的正负极材料(LiCoO_(2)、LiMn_(2)O_(4)、LiFePO_(4)、NCM811)具有较好的相容性,普适性较好。以M2为电解质隔膜,金属锂为负极,分别以LiCoO_(2)和石墨为正极组装成半电池,0.2 C倍率下的首次放电比容量分别为141.3和347.1 mA·h/g,100圈循环后容量保持率分别为94.8%和85.0%;2.0 C倍率下,放电比容量分别为119.8和239.0 mA·h/g。

关键词：聚合物电解质膜互穿网络技术锂离子电池有机电化学与工业

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Resource utilization of drinking water treatment aluminum sludge in green cementing materials: Hydration characteristics and hydration kinetics

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Journal of Environmental Sciences 2024年第10期144卷 236-248页

作者： Jing Yang cheng chen Shuoyu chen Yujie Ren Jinsuo Lu School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China

As a byproduct of water treatment,drinking water treatment aluminum sludge(DWTAS)has challenges related to imperfect treatment and disposal,which has caused potential harm to human health and the *** this paper,heat treatment DWTAS as a supplement cementitious material was used to prepare a green cementing *** results show that the 800℃ is considered as the optimum heat treatment temperature for ***-800℃ is fully activated after thermal decomposition to form incompletely crystallized highly activeγ-Al2O3 and active SiO_(2).The addition of DWTAS promoted the formation of ettringite and C-(A)-S-H gel,which could make up for the low early compressive strength of cementing materials to a certain *** cured for 90 days,the compressive strength of the mortar with 30% DWTAS-800℃ reached 44.86 *** dynamic process was well simulated by Krstulovi′c-Dabi′c hydration kinetics *** study provided a methodology for the fabrication of environmentally friendly and cost-effective compound cementitiousmaterials and proposed a“waste-to-resource”strategy for the sustainable management of typical solid wastes.

关键词： Drinking water treatment aluminum sludge Green cementing material Hydration characteristics Hydration kinetics

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Grouping Decision Algorithm for Dynamic Terminals in Random Access Networks

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Journal of Communications and Information Networks 2024年第2期9卷 176-183页

作者： Hongliang Sun Tongfei chen Chuangye Zhao Mengxin chen College of Information and Control Engineering Jilin Institute of Chemical TechnologyJilin 132022China

This paper proposes a grouping decision algorithm for random access networks with the carrier sense multiple access (CSMA) mechanism, which can balance the traffic load and solve the hidden terminal issue. Considering the arrival characteristics of terminals and quality of service (QoS) requirements, the traffic load is evaluated based on the effective bandwidth theory. Additionally, a probability matrix of hidden terminals is constructed to take into account the dynamic nature of hidden terminal relations. In the grouping process, an income function is established with a view to the benefits of decreasing the probability of hidden terminal collisions and load balancing. Then, we introduce the grey wolf optimization (GWO) algorithm to implement the grouping decision. Simulation results demonstrate that the grouping algorithm can effectively alleviate the performance degradation and facilitate the management of network resources.

关键词： random access network hidden terminal collision probability effective bandwidth traffic load grey wolf optimization

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Risk-averse Robust Interval Economic Dispatch for Power Systems with Large-scale Wind Power Integration

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 105-116页

作者： Zhenjia Lin Haoyong chen Jinbin chen Jianping Huang Mengshi Li School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China Department of Electrical Engineering Technical University of DenmarkDenmark

This paper presents a robust interval economic dispatch(RIED)model for power systems with large-scale wind power *** from existing interval optimization(IO)approaches that merely rely on the upper and lower boundaries of random variables,the distribution information retained in the historical data is introduced to the IO method in this *** on the available probability distribution function(PDF),wind power curtailment and load shedding are quantified as the operational risk and incorporated into the decision-making *** this model,we need not rely on the forecasted value of wind power,which is randomly fluctuating and quite ***,when the PDFs of wind power are taken into account,the resulting dispatch solution makes a good tradeoff between the generation cost and the operational ***,the RIED model yields an optimal dispatch solution for thermal units and the allowable intervals of wind power for the wind farms,which efficiently mitigates the uncertainty in wind power generation and provides more practical suggestions for system *** studies are conducted on a modified IEEE-118 bus system and the results verify the effectiveness of the proposed RIED model.

关键词： Economic dispatch interval optimization risk-averse wind power generation

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