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A low-frequency and broadband wave-insulating vibration isolator based on plate-shaped metastructures

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Applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1171-1188页

作者： wei wei Feng GUAN Xin FANG College of Intelligent Science National University of Defense TechnologyChangsha410073China Naval Research Academy Beijing100161China

A metamaterial vibration isolator,termed as wave-insulating isolator,is proposed,which preserves enough load-bearing capability and offers ultra-low and broad bandgaps for greatly enhanced wave *** consists of plate-shaped metacells,whose symmetric and antisymmetric local resonant modes offer several low and broad mode bandgaps although the complete bandgap remains high and *** bandgap mechanisms,vibration isolation properties,effects of key parameters,and robustness to complex conditions are *** experimentally demonstrated,the wave-insulating isolator can improve the vibration insulation in the ranges of[50 Hz,180 Hz]and[260 Hz,400 Hz]by 15 dB and 25 dB,respectively,in contrast to the conventional isolator with the same first resonant frequency.

关键词： metamaterial and metastructure vibration isolation bandgap wave insulation plate

一种在含水介质和食物样品中快速和高灵敏度的双通道检测氰根的化学传感器（英文）

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有机化学 2018年第7期38卷 1792-1799页

作者：曲文娟李文婷张海丽张有明林奇姚虹魏太保西北师范大学化学化工学院生态环境相关高分子材料教育部重点实验室甘肃省高分子材料重点实验室兰州730070

众所周知,氰根离子(CN-)是最具有毒性的阴离子之一,它能够对环境和生物体造成很多不良的影响,因此,研究氰根离子的检测方法是非常有必要的,尤其是在水中以及食物中进行检测.然而,由于游离态的氰根离子半衰期短,但很多氰根离子检测方法... 详细信息

众所周知,氰根离子(CN-)是最具有毒性的阴离子之一,它能够对环境和生物体造成很多不良的影响,因此,研究氰根离子的检测方法是非常有必要的,尤其是在水中以及食物中进行检测.然而,由于游离态的氰根离子半衰期短,但很多氰根离子检测方法所需分析时间较长并且容易受到其他阴离子的干扰,这些都成为精确检测氰根离子的挑战.利用氰根离子特殊的亲核性,合成了一个基于萘并呋喃酰氯和2-氨基苯并咪唑的新型传感器分子Q1-2,其设计原理在于通过调节分子内的氢键来影响分子的π-共轭效应.当加入氰根离子之后,传感器Q1-2的紫外光谱出现红移现象,并且荧光也立刻猝灭.计算得到该传感器通过紫外和荧光检测氰根离子的最低检测限分别为8.0769×10^(-7)和1.0510×10^(-9) mol/L.其他共存的阴离子几乎不能干扰该识别过程.不仅如此,Q1-2可成功地应用于可见光和365 nm紫外灯照射下,肉眼识别食物样品中和硅胶板上的氰根.

关键词：双通道检测氰根食物样品硅胶板

The lithology and composition of lunar mantle modifi ed by ilmenite bearing cumulate: A thermodynamic model

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Acta Geochimica 2024年第5期43卷 856-875页

作者： wei Huang wei Du State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of Sciences University of Chinese Academy of Sciences Center for Excellence in Comparative Planetology Chinese Academy of Sciences

Due to their high density,the ilmenite-bearing cumulates (IBC)(with or without KREEP) formed during the late-stage lunar magma ocean solidifi cation are thought to sink into the underlying lunar mantle and trigger lunar mantle *** evidence implied that IBC may descend deep inside the Moon and remain as a partially molten layer at the core-mantle boundary (CMB).However,partial melting may have occurred on the mixed mantle cumulates during the sinking of IBC/KREEP and the silicate melt may be positively buoyant,thus preventing the IBC/KREEP layer from sinking to the ***,we perform thermodynamic simulation on the stability of lunar mantle cumulates at diff erent depths mixed with diff erent amounts of IBC/KREEP from an updated LMO *** modeling results suggest that the sinking of IBC/KREEP will cause at least 5 wt%partial melting in the shallow (～120 km) and a much larger degree of partial melting in the deep lunar mantle (～420 km).Due to the density contrast with the surrounding mantle,IBC/KREEP-bearing melts could potentially decouple under certain *** modifi ed lunar mantle by sinking of IBC/KREEP can better explain the formation of diff erent kinds of lunar basaltic magma than the primary lunar mantle formed through diff erentiation of lunar magma *** of IBC/KREEP back into the lunar mantle may introduce plagioclase,clinopyroxene,garnet,and incompatible radioactive elements into the deep lunar mantle,which will further aff ect the thermal and chemical evolution of the lunar interior.

关键词： Ilmenite-bearing cumulate KREEP Lunar mantle overturn Partial melting pMELTS

基于碘功能化柱[5]芳烃超分子有机凝胶的制备和性能

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有机化学 2018年第10期38卷 2741-2746页

作者：陈进发刘茜韩冰冰丁金东张有明林奇姚虹魏太保西北师范大学化学化工学院教育部生态环境相关材料重点实验室甘肃省高分子材料重点实验室兰州730070

柱芳烃作为一种新型的大环芳烃化合物,基于柱芳烃的超分子凝胶一直深受大家关注.设计合成了一种碘功能化的柱[5]芳烃.该柱[5]芳烃在环己醇中可以形成稳定的超分子有机凝胶,相转变温度约为96℃.分别使用浓度核磁,2DNOESY氢谱,X射线衍射(X... 详细信息

柱芳烃作为一种新型的大环芳烃化合物,基于柱芳烃的超分子凝胶一直深受大家关注.设计合成了一种碘功能化的柱[5]芳烃.该柱[5]芳烃在环己醇中可以形成稳定的超分子有机凝胶,相转变温度约为96℃.分别使用浓度核磁,2DNOESY氢谱,X射线衍射(XRD)粉末衍射和扫描电镜等实验对凝胶的形成过程进行了表征.结果表明,碘功能化的柱[5]芳烃自组装形成了一种片状结构.同时,研究了该凝胶的荧光识别性质.当在凝胶上分别加入Fe^(3+),Ag^+,Ca^(2+),Co^(2+), Ni^(2+), Cd^(2+), Pb^(2+), Zn^(2+), Cu^(2+), Mg^(2+)和Hg^(2+)等金属离子, 10 min后发现Hg^(2+)和Ag^+可以使凝胶的蓝色荧光猝灭.因此,该凝胶可以用于荧光检测Hg^(2+)与Ag^+.

关键词：柱芳烃超分子有机凝胶荧光检测金属离子

Humic acid-mediated transport of a typical soil passivation remediation product(chloropyromorphite)in saturated porous media

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Journal of Environmental Sciences 2024年第7期141卷 51-62页

作者： Xinying Li Mengjia Zhang Siyuan Li wei wei School of Environment Jiangsu Engineering Lab of Water and Soil Eco-remediationJiangsu Province Engineering Research Center of Environmental Risk Prevention and Emergency Response TechnologyNanjing Normal UniversityNanjing 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China

Conversion of labile Pb species into chloropyromorphite(CPY)using phosphorus-bearing amendments was considered to be an ideal strategy in soil passivation ***,the fate and transport of CPY in the soil are poorly *** study aims to fill the knowledge gap by evaluating the fate and transport of CPY under environmentally relevant conditions of humic acid(HA),pH,electrolyte concentration,and species through the saturated sandy *** showed that bare CPY colloids are basically immobile in sandy porous media while the co-existence of HA made the transport of CPY improved by30%-93.5%.Facilitated transport of CPY was attributed to the increased stability of CPY and the repulsive interaction between CPY particles and sands due to HA *** mobility of CPY was also increased with increasing pH from 5.0 to *** the pH was 9 with a10 mmol/L NaCl background solution,the stronger energy barrier between CPY and sand led to enhanced transport *** divalent Ca^(2+)had a more dramatic effect than monovalent Na^(+)on the aggregation and sedimentation of CPY colloids due to its effectivescreening of the surface charge of CPY and bridging interaction with CPY ***-LandauVerwey-Overbeek theory and attachment efficiency calculation indicated that high energy barriers were responsible for the high mobility of CPY colloids,while the retention of CPY in sands was mainly caused by secondary energy minimum and physically *** findings of this work can help to evaluate the fate of soil passivation remediation products in natural water and soil.

关键词： Chloropyromorphite DLVO theory Stability Saturated porous medium Transport

The Existence of a Meridional Curve in Closed Incompressible Surfaces in Fully Alternating Link Complements

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Chinese Annals of Mathematics,Series B 2024年第1期45卷 73-80页

作者： wei LIN School of Mathematical Sciences Dalian University of TechnologyDalian 116024LiaoningChina

Menasco showed that a closed incompressible surface in the complement of a non-split prime alternating link in S^(3) contains a circle isotopic in the link complement to a meridian of the *** on this result,he was able to argue the hyperbolicity of non-split prime alternating links in *** et *** that if F■S×I\L is an essential torus,then F contains a circle which is isotopic in S×I\L to a meridian of *** author generalizes his result as follows:Let S be a closed orientable surface,L be a fully alternating link in S×I\If F ■ S×I\L is a closed essential surface,then F contains a circle which is isotopic in S×I\L to a meridian of L.

关键词： Fully alternating Incompressible surfaces Meridionally incompressible

Zeros of Complete Symmetric Polynomials over Finite Fields

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Journal of Systems Science & Complexity 2024年第4期37卷 1772-1788页

作者： CAO wei School of Mathematics and Statistics Minnan Normal UniversityZhangzhou 363000China

Wan and Zhang(2021) obtained a nontrivial lower bound for the number of zeros of complete symmetric polynomials over finite fields,and proposed a problem whether their bound can be *** this paper,the author improves Wan-Zhang's bound from three *** proposed results are based on the estimates related to the number of certain permutations and the value sets of non-permutation polynomials associated to the complete symmetric *** the author believes that there are still possibilities to improve the bounds and hence Wan-Zhang's bound.

关键词： Complete symmetric polynomial finite field permutation polynomial value set

Task-specific Part Discovery for Fine-grained Few-shot Classification

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Machine Intelligence Research 2024年第5期21卷 954-965页

作者： Yongxian wei Xiu-Shen wei School of Computer Science and Technology Nanjing University of Science and TechnologyNanjing210094China

Localizing discriminative object parts(e.g.,bird head)is crucial for fine-grained classification tasks,especially for the more challenging fine-grained few-shot *** work always relies on the learned object parts in a unified manner,where they attend the same object parts(even with common attention weights)for different few-shot episodic *** this paper,we propose that it should adaptively capture the task-specific object parts that require attention for each few-shot task,since the parts that can distinguish different tasks are naturally *** for a few-shot task,after obtaining part-level deep features,we learn a task-specific part-based dictionary for both aligning and reweighting part features in an ***,part-level categorical prototypes are generated based on the part features of support data,which are later employed by calculating distances to classify query data for *** retain the discriminative ability of the part-level representations(i.e.,part features and part prototypes),we design an optimal transport solution that also utilizes query data in a transductive way to optimize the aforementioned distance calculation for the final *** experiments on five fine-grained benchmarks show the superiority of our method,especially for the 1-shot setting,gaining 0.12%,8.56%and 5.87%improvements over state-of-the-art methods on CUB,Stanford Dogs,and Stanford Cars,respectively.

关键词： Fine-grained image recognition few-shot learning transductive learning visual dictionary part feature discovery

High Speed Sintering:Assessing the Influence of Energy Input on Microstructure and Mechanical Properties of Polyether Block Amide(PEBA)Parts

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Chinese Journal of Polymer Science 2024年第5期42卷 675-682,I0004,I0010页

作者： Jiang-Tao Sun Zhi-Yong Fan Yi-wei Mao wei Li wei Zhu Dao-Sheng Cai Qing-Song wei State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430074China National Engineering Research Centre for High Efficiency Grinding Hunan UniversityChangsha410082China Wuhan EasyMFG Technology CO. LTDWuhan430074China

High speed sintering,a new powder-bed fusion additive manufacturing technology,utilizes infrared lights(IR)to intensely heat and melt polymer *** presence of defects such as porosity,which is associated with particle coalescence,is highly dependdent on the level of energy *** study investigate the influcence of energy input on porosity and its subsequent effects on the mechanical properties and microstructures of PEBA *** parts were manufactured with a variety of lamp powers,resulting in a range of energy input levels spanning from low to ***,they underwent testing using Archimedes’method,followed by tensile *** porosity,mechanical characteristics,and energy input exhibit a strong correlation;inadequate energy input was the primary cause of pore *** the reduced IR light power resulted in the following outcomes:porosity,ultimate tensile strength,and elongation of 1.37%,7.6 MPa,and 194.2%,*** the energy input was further increased,the porosity was reduced to as low as 0.05%and the ultimate tensile strength and elongation were increased to their peak values of 233.8%and 9.1 MPa,respectively.

关键词： High speed sintering Additive manufacturing Energy input Powder bed fusion PEBA