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微尺度负泊松比结构件动静态力学性能

锻压技术 2024年第7期49卷 64-73页

作者：冉家琪钟伏兴徐腾龚峰深圳大学机电与控制工程学院广东深圳518060

针对疏孔结构骨植入物目前出现的诸多问题,对负泊松比结构进行参数化设计、有限元分析模拟和力学实验,探究负泊松比结构的几何特性和力学特性。研究表明:内凹六边形负泊松比结构的泊松比数值受多个结构胞元的几何参数影响。其对竖直杆... 详细信息

针对疏孔结构骨植入物目前出现的诸多问题,对负泊松比结构进行参数化设计、有限元分析模拟和力学实验,探究负泊松比结构的几何特性和力学特性。研究表明:内凹六边形负泊松比结构的泊松比数值受多个结构胞元的几何参数影响。其对竖直杆与倾斜杆夹角的大小尤为敏感,表现出尺寸越大性能越强的尺寸效应。普通内凹六边形负泊松比结构改进为内凹六边形负泊松比镶嵌结构(镶嵌单个大胞元),可以减轻结构重量及提高孔隙率,但这种增益效果随着层数的增加会逐渐降低。内凹六边形负泊松比镶嵌结构的胞元尺寸越大,抗压强度越弱、抗冲击性能越强;胞元数量、层数越多,抗压强度越强。

关键词：负泊松比镶嵌结构尺寸效应动静态力学性能胞元数量胞元层数内凹六边形

Bifunctional Oxygen Electrocatalyst of Mesoporous Ni/NiO Nanosheets for Flexible Rechargeable Zn–Air Batteries

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Nano-Micro Letters 2020年第5期12卷 165-176页

作者： Peitao Liu jiaqi ran Baorui Xia Shibo Xi Daqiang Gao John Wang Key Laboratory for Magnetism and Magnetic Materials of MOE Key Laboratory of Special Function Materials and Structure Design of MOELanzhou UniversityLanzhou 730000People’s Republic of China Institute of Chemical and Engineering Sciences A*STAR1 Pesek RoadJurong Island 627833Singapore Department of Material Science and Engineering National University of SingaporeEngineering Drive 3Singapore 117575Singapore

One approach to accelerate the stagnant kinetics of both the oxygen reduction and evolution reactions(ORR/OER)is to develop a rationally designed multiphase nanocomposite,where the functions arising from each of the constituent phases,their interfaces,and the overall structure are properly ***,we successfully synthesized an oxygen electrocatalyst consisting of Ni nanoparticles purposely interpenetrated into mesoporous NiO nanosheets(porous Ni/NiO).Benefiting from the contributions of the Ni and NiO phases,the well-established pore channels for charge transport at the interface between the phases,and the enhanced conductivity due to oxygen-deficiency at the pore edges,the porous Ni/NiO nanosheets show a potential of 1.49 V(10 mA cm^-2)for the OER and a half-wave potential of 0.76 V for the ORR,outperforming their noble metal *** significantly,a Zn-air battery employing the porous Ni/NiO nanosheets exhibits an initial charging-discharging voltage gap of 0.83 V(2 mA cm^-2),specific capacity of 853 mAh gZn^-1 at 20 mA cm^-2,and long-time cycling stability(120 h).In addition,the porous Ni/NiO-based solid-like Zn-air battery shows excellent electrochemical performance and flexibility,illustrating its great potential as a next-generation rechargeable power source for flexible electronics.

关键词： Porous Ni/NiO Oxygen reduction reaction Oxygen evolution reaction Electrocatalysis Flexible Zn–air battery

Layered CuNi-Cu_(2)O/NiAlO_(x) nanocatalyst for rapid conversion of p-nitrophenol to p-aminophenol

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Nano Research 2021年第12期14卷 4616-4624页

作者： Lin Fu Wei Zhou Ming Wen Qingsheng Wu Weiying Li Dandan Wu Quanjing Zhu jiaqi ran Panpan Ren School of Chemical Science and Engineering College of Environmental Science and EngineeringKey Laboratory of Yangtze River Water EnvironmentMinistry of EducationShanghai Key Laboratory of Chemical Assessment and SustainabilityTongji UniversityShanghai200092China School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai201418China

In order to well arrange active sites and avoid byproducts, the reasonable structured carrier nanocatalyst plays a crucial role in high catalytic performance, but still remains a challenge. Herein, the layered CuNi-Cu_(2)O/NiAlO_(x) nanosheets have been constructed through hydrothermal synthesis followed by calcination and H_(2) reduction treatment process. The in-situ formed CuNi nanoalloys (NAs) and nano-Cu_(2)O were evenly distributed on the bilateral surface of layered NiAlOx nanosheets. Based on the planar structure of nanosheet, the synergy between catalytic active CuNi NAs and photocatalytic active nano-Cu_(2)O endows CuNi-Cu_(2)O/NiAlO_(x) nanosheets with rapid conversion efficiency for catalyzing p-nitrophenol (p-NP, 14 mg·L^(−1)) to p-aminophenol (p-AP) in 32 s with the reaction rate constant k up to 0.1779 s−1, and no obvious performance decay can be observed even over 27 cycles. Moreover, high concentration of p-NP at 10 and 20 g·L^(−1) could be reduced to p-AP within 14 and 20 min, respectively. Such designed nanoalloy/bimetal-oxide heterostructure can provide a solution for rapid conversion of aminoaromatics from nitroaromatics wastewater even at a large concentration range.

关键词： layered CuNi-Cu_(2)O/NiAlO_(x) heterostructure catalyst p-nitrophenol p-aminophenol

Trifunctional Cu-Mesh/Cu_(2)O@FeO Nanoarrays for Highly Efficient Degradation of Antibiotic, Inactivation of Antibiotic-Resistant Bacteria, and Damage of Antibiotics Resistance Genes

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Energy & Environmental Materials 2023年第1期6卷 349-359页

作者： Long Zhao Wei Zhou Ming Wen Qingsheng Wu Weiying Li Yongqing Fu Quanjing Zhu Sheng Chen and jiaqi ran Shanghai Key Laboratory of Chemical Assessment and Sustainability State Key Laboratory of Pollution Control and Resource ReuseSchool of Chemical Science and EngineeringCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China Faculty of Engineering and Environment Northumbria UniversityNewcastle upon Tyne NE99UK

Trifunctional Cu-mesh/Cu_(2)O@FeO nanoarrays heterostructure is designed and fabricated by integrating CuCu_(2)O@FeO nanoarrays onto Cu-mesh(CM)via an in situ growth and phase transformation *** is successfully applied to efficiently mitigate the antibiotic pollution,including degradation of antibiotics,inactivation of antibiotic-resistant bacteria(ARB),and damage of antibiotics resistance genes(ARGs).Under visible-light irradiation,CM/CuCu_(2)O@FeO nanoarrays exhibit a superior degradation efficiency on antibiotics(e.g.,up to 99%in 25 min for tetracycline hydrochloride,TC),due to the generated reactive oxygen species(ROS),especially the dominant·O^(2−).It can fully inactivate ***(HB101)with initial number of~108 CFU mL^(−1) in 10 min,which is mainly attributed to the synergistic effects of 1D nanostructure,dissolved metal ions,and generated ***,it is able to damage ARGs after 180 min of photodegradation,including tetA(vs TC)of 3.3 log 10,aphA(vs kanamycin sulfate,KAN)of 3.4 log 10,and tnpA(vs ampicillin,AMP)of 4.4 log 10,*** work explores a green way for treating antibiotic pollution under visible light.

关键词： antibiotic antibiotic resistance genes antibiotic-resistant bacteria Cu-Mesh/Cu_(2)O@FeO nanoarrays photocatalytic degradation

Structural insights into the Oryza sativa cation transporters HKTs in salt tolerance

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Journal of Integrative Plant Biology 2024年第4期66卷 700-708页

作者： ran Gao Yutian Jia Xia Xu Peng Fu jiaqi Zhou Guanghui Yang State Key Laboratory of Plant Environmental Resilience Frontiers Science Center for Molecular Design BreedingCollege of Biological SciencesChina Agricultural UniversityBeijing 100193China

The high-affinity potassium transporters(HKTs),selectively permeable to either Na^(+)alone or Na^(+)/K^(+),play pivotal roles in maintaining plant Na^(+)/K^(+)*** their involvement in salt tolerance is widely reported,the molecular underpinnings of Oryza sativa HKTs remain *** this study,we elucidate the structures of OsHKT1;1 and OsHKT2;1,representing two distinct classes of rice *** dimeric assembled OsHKTs can be structurally divided into four *** the dimer interface,a half-helix or a loop in the third domain is coordinated by the C-terminal region of the opposite ***,we present the structures of OsHKT1;5 salt-tolerant and salt-sensitive variants,a key quantitative trait locus associated with salt *** salt-tolerant variant of OsHKT1;5 exhibits enhanced Na^(+)transport capability and displays a more flexible *** findings shed light on the molecular basis of rice HKTs and provide insights into their role in salt tolerance.

关键词： HKT salt-tolerant structure

The effects of selenium on the translation efficiency of selenoproteins Gpx1， Gpx4， and Txnrd1 in oxLDL-induced ***926 cells

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Food Science and Human Wellness 2024年

作者： jiaqi Lu Jing Meng Yanzhi Lang Abdul Rehman Yamei Yan Linwu ran School of Public Health， Ningxia Medical University Key Laboratory of Environmental Factors and Chronic Disease Control Yinchuan School of Clinical Medicine， Ningxia Medical University Goji Berry Research Institute， Ningxia Academy of Agriculture and Forestry Sciences

Selenium is a crucial trace element that contributes to physiological processes in the body as selenoproteins. Selenoproteins serve as an integral role in the body in controlling the redox state of cells and protecting against damage induced by oxidative stress. This study aimed to investigate the effects and possible mechanism of selenium on selenoproteins expression in ***926 cells induced by oxLDL. The impact of selenium on the viability of ***926 cells was detected by the MTT method， and intracellular ROS level and mitochondrial membrane potential were assessed by fluorescent probe DCFH-DA and JC-1， respectively. RNA-seq， quantitative real-time PCR (RT-qPCR)， and western blot were used to investigate the selenoprotein expression. Selenoprotein mRNA translation efficiency was analyzed by ribosome profiling (Ribo-Seq) coupled with transcriptomics. Our data showed that selenium supplementation (0.5 μmol/L) significantly decreased ROS production， reduced mitochondrial inner membrane potential and increased the proliferative activity of ***926 cells induced by oxLDL. Moreover， The protective effects of selenium against oxLDL-induced ***926 cell injury were associated with the upregulation of the expressions of selenoproteins GPX1， GPX4， and TXNRD1. Furthermore， the expressions of selenoproteins GPX1 and GPX4 were hierarchically controlled， but the expressions of selenoproteins TXNRD1 were mainly regulated by oxLDL. Finally， Ribo-Seq coupled with transcriptomics results demonstrated that the expressions of selenoproteins GPX1， GPX4， and TXNRD1 were regulated at the translation process level. These findings suggested that selenium could have preventive effects in oxLDL induced ***926 cell injury by regulating the selenoprotein expression， and the selenoproteins expressions at the translation level in vascular endothelial cells need further study.

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Spin Resolved Zero-Line Modes in Minimally Twisted Bilayer Graphene from Exchange Field and Gate Voltage

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Chinese Physics Letters 2024年第7期41卷 111-116页

作者： Sanyi You jiaqi An Zhenhua Qiao International Centre for Quantum Design of Functional Materials CAS Key Laboratory of Strongly Coupled Quantum Matter Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

The reliance on spin-orbit coupling or strong magnetic fields has always posed significant challenges for the mass production and even laboratory realization of most topological materials. Valley-based topological zero-line modes have attracted widespread attention due to their substantial advantage of being initially realizable with just an external electric field. However, the uncontrollable nature of electrode alignment and precise fabrication has greatly hindered the advancement in this field. By utilizing minimally twisted bilayer graphene and introducing exchange fields from magnetic substrates, we successfully realize a spin-resolved, electrode-free topological zeroline mode. Further integration of electrodes that do not require alignment considerations significantly enhances the tunability of the system's band structure. Our approach offers a promising new support for the dazzling potential of topological zero-line mode in the realm of low-energy-consumption electronics.

关键词： structure field topological

Intersection theory rules symbology

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 93-104页

作者： jiaqi Chen Bo Feng Lilin Yang Beijing Computational Science Research Center Beijing 100084China Zhejiang Institute of Modern Physics School of PhysicsZhejiang UniversityHangzhou 310027China Peng Huanwu Center for Fundamental Theory Hefei 230026China

We propose a novel method to determine the structure of symbols for any family of polylogarithmic Feynman *** the d log-bases and simple formulas for the leading order and next-to-leading contributions to the intersection numbers,we give a streamlined procedure to compute the entries in the coefficient matrices of canonical differential equations,including the symbol letters and the rational *** also provide a selection rule to decide whether a given matrix element must be *** symbol letters are deeply related to the poles of the integrands and also have interesting connections to the geometry of Newton *** method can be applied to many cutting-edge multi-loop *** simplicity of our results also hints at the possible underlying structure in perturbative quantum field theories.

关键词： scattering amplitude Feynman integral symbology

Modelling the formation and dissolution behavior of alumina agglomerate in the cryolite

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Particuology 2024年第3期86卷 211-222页

作者： jiaqi Wang Mao Li Benjun Cheng Hesong Li School of Energy Science and Engineering Central South UniversityChangsha410083China

The presence of alumina agglomerates seriously affects the current efficiency of the aluminum electrolysis *** the dynamic dissolution process of agglomerates is essential to improve the current efficiency of aluminum electrolysis.A mathematical model is proposed to describe the different phenomena from the formation until complete dissolution of *** permeation and solidification processes of cryolite,a semi-analytical mathematical model is developed to formulate the formation,melting and dissolution processes of agglomerates,and the time duration for each stage is *** and heat mass transfer of agglomerates are explored based on the packing theory and mechanism of heat mass transfer in wet porous *** approach is applied to investigate the main factors affecting the dissolution stages and porosity of *** results show that the superheat has a great influence on the formation and melting stage,the diameter of agglomerates can reach 14.93 mm for 200 particles *** density decreases with the increase of agglomerated particle number,which varies in the range of 2.27-2.28 g/cm^(3).The average dissolution rate of agglomerates is about 1.83×10^(-5)-2.95×10^(-5) kg/s within the range of alumina concentration in this study.

关键词： Mathematical model Alumina agglomerate Porous media Packing theory Heatand mass transfer