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Polyvinylpyrrolidone/graphene oxide thin films coated on quartz crystal microbalance electrode for NH_3 detection at room temperature

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Science China(Technological Sciences) 2016年第9期59卷 1377-1382页

作者： MA XingFang XIE GuangZhong SU yuanjie DU HongFei XIE Tao JIANG YaDong School of Optoelectronic Information State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China (UESTC)

In this paper, composite film based on polyvinylpyrrolidone(PVP)/graphene oxide(GO) was fabricated by spray method on AT-cut 9.986 MHz quartz crystal microbalance(QCM) for NH_3 sensing. The thin films were characterized by scanning electron microscope(SEM), Fourier transform infrared spectroscopy(FTIR) and ultraviolet-visible spectroscopy(UV-VIS) to investigate the morphologies and the composition contents, respectively. The experimental results reveal that PVP/GO based sensor holds higher sensitivity, larger responsiveness and smaller baseline drift than those based on pure PVP at room temperature. Besides, the prepared sensor exhibits greater response to NH_3 than other gases such as CO, CO_2 and NO_2 at the same concentration. The good linearity, reproducibility and stability demonstrate the practicability of PVP/GO hybrid film in detecting NH_3.

关键词： polyvinylpyrrolidone graphene oxide quartz crystal microbalance NH3 gas sensor

On the modeling of deformation mechanisms in a Mg-3Al-1Zn alloy under biaxial tension

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Journal of Materials Science & Technology 2023年第14期145卷 101-115页

作者： Hua Qiao Yao Cheng yuanjie Fu Yunchang Xin Gang Chen Peidong Wu Department of Mechanical Engineering McMaster UniversityHamiltonOntario L8S 4L7Canada Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 210009China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

Although the{10-12}twinning behavior of Mg alloys under uniaxial tension and compression has been extensively investigated,the simulations of{10-12}twinning behavior under biaxial tension have rarely been *** this work,the EVPSC-TDT model is first employed to systematically investigate the deformation behavior of a Mg alloy AZ31 plate under biaxial tension in the RD-TD and ND-TD *** RD,TD and ND refer to the rolling direction,transverse direction,and normal direction of the hot rolled *** measured stress-strain curves and texture evolutions are well predicted and the con-tours of plastic work under biaxial tension are also constructed for comparison with *** plastic response has been interpreted in terms of relative activities of various deformation *** bi-axial tension in the RD-TD plane,basal and pyramidal slips mainly contribute to the plastic deformation for stress ratios ofσRD:σTD=1:2 to 2:*** slip becomes more active forσRD:σTD=1:4 and 4:*** twinning could be activated and so cause texture reorientation at large strains,especially forσRD:σTD=1:*** six-fold feature of{10-10}pole figure could still be observed forσRD:σTD=1:4 and 4:1 at large *** biaxial tension in the ND-TD plane,tensile twinning plays an important role forσND:σTD≥1:2,while prismatic slip contributes to plastic deformation for the other *** the in-crease of stress ratio fromσND:σTD≥1:1 to 1:0,the predicted twin volume fractions(VFs)at a specific strain along the ND,εND,almost linearly decrease,however,it is seen that the experimental ones at given strains along the ND do not follow such a trend with the measured twin VFs within the range of stress ratios,2:1≤σND:σTD≤6:1,clearly being overestimated,and the difference between experiments and simulations becomes most obvious at the relatively small strain ofεND=*** possible reasons for the observed difference are discussed.

关键词： Magnesium alloy Biaxial tension Simulation Twinning

Mechanisms of Exogenous Nitric Oxide and 24-Epibrassinolide Alleviating Chlorosis of Peanut Plants Under Iron Deficiency

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Pedosphere 2018年第6期28卷 926-942页

作者： SONG Yiling DONG yuanjie TIAN Xianyi WANG Wanwan Zhenli HE College of Resources and Environment National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Shandong Agricultural University Indian River Research and Education Center Institute of Food and Agricultural Sciences University of Florida

Iron(Fe) is a crucial transition metal for all living organisms including plants; however, Fe deficiency frequently occurs in plant because only a small portion of Fe is bioavailable in soil in recent years. To cope with Fe deficiency, plants have evolved a wide range of adaptive responses from changes in morphology to altered physiology. To understand the role of nitric oxide(NO) and 24-epibrassinolide(EBR) in alleviating chlorosis induced by Fe deficiency in peanut(Arachis hypogaea L.) plants, we determined the concentration of chlorophylls, the activation, uptake, and translocation of Fe, the activities of key enzymes, such as ferric-chelate reductase(FCR),proton-translocating adenosine triphosphatase(H^+-ATPase), and antioxidant enzymes, and the accumulation of reactive oxygen species(ROS) and malondialdehyde(MDA) of peanut plants under Fe sufficiency(100 μmol L^(-1)ethylenediaminetetraacetic acid(EDTA)-Fe) and Fe deficiency(0 μmol L^(-1)EDTA-Fe). We also investigated the production of NO in peanut plants subjected to Fe deficiency with foliar application of sodium nitroprusside(SNP), a donor of NO, and/or EBR. The results showed that Fe deficiency resulted in severe chlorosis and oxidative stress, significantly decreased the concentration of chlorophylls and active Fe, and significantly increased NO production. Foliar application of NO and/or EBR increased the activity of antioxidant enzymes, superoxide dismutase,peroxidase, and catalase, and decreased the ROS and MDA concentrations, thus enhancing the resistance of plants to oxidative *** of NO also significantly increased Fe translocation from the roots to the shoots and enhanced the transfer of Fe from the cell wall fraction to the cell organelle and soluble fractions. Consequently, the concentrations of available Fe and chlorophylls in the leaves were elevated. Furthermore, the activities of H^+-ATPase and FCR were enhanced in the Fe-deficient plants. Simultaneously,there was a significant in

关键词： active iron antioxidant enzyme subcellular structure chlorophyll oxidative stress reactive oxygen species sodium nitroprusside

基于改进YOLOv5n的花生荚果实时检测方法

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中国农机化学报 2025年第2期46卷 230-236,258页

作者：吴阳华王建楠刘敏基游兆延谢焕雄杜元杰农业农村部南京农业机械化研究所南京市210014 中国农业科学院北京市100081

花生荚果分级是花生商品化过程中的重要环节。针对传统花生荚果分级机械精度较低、局限性较大等问题,提出一种基于深度学习的YOLOv5n—SP花生荚果检测算法,对花生荚果按籽仁数量和是否破损进行分级。结合GSConv构建轻量级颈部网络,轻量... 详细信息

花生荚果分级是花生商品化过程中的重要环节。针对传统花生荚果分级机械精度较低、局限性较大等问题,提出一种基于深度学习的YOLOv5n—SP花生荚果检测算法,对花生荚果按籽仁数量和是否破损进行分级。结合GSConv构建轻量级颈部网络,轻量化的同时实现性能提升;为减少计算冗余,引入Slimming算法进行通道剪枝,在保证性能的前提下进一步降低模型参数量;引入通道智慧蒸馏算法,提高剪枝模型性能。结果表明,改进后的YOLOv5n—SP相较于原模型YOLOv5n,浮点计算量减少58.5%,模型精确率、召回率分别提高2.0%和1.1%,实时检测速度达到84帧/s,提升7.7%。

关键词：花生荚果分级机械轻量化模型剪枝算法智慧蒸馏算法实时检测

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One-step synthesis of hollow PEI-NaBiF4:Yb^3+/Er^3+upconversion nanoparticles for water-responsive luminescent probe

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Journal of Rare Earths 2020年第4期38卷 362-368页

作者： Zaifa Pan Yingting Wen Tao Wang Kai Wang yuanjie Teng Kang Shao College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310000China

Novel PEI-modified NaBiF4:Yb3+/Er3+upconversion nanoparticles(UCNPs)with hollow structure were prepared by a surface modification free one-step solvothermal method and applied as a luminescent probe to determinate water content in organic ***,SEM and HRTEM results demonstrate that the obtained PEI-NaBiF4:Yb3+/Er3+UCNPs are pure hexagonal phase with uniform *** successful modification of PEI on the UCNPs surface was evidenced byζ-potential test,XPS and TG *** synthesized UCNPs are disintegrated into smaller nanoparticles in the presence of water and thus result in a surface quenching effect,which show the features of 0-100%wide range water response in various organic *** sensing performance towards real samples was validated by the water content determination in beer,rum and white ***,the luminescence intensity variation of the PEI-modified NaBiF4:Yb3+/Er3+enable the test visualization and ease of portability.

关键词： Luminescent probe Upconversion nanoparticles Water detection Organic solvents Rare earths

Effects of Exogenous Nitric Oxide and 24-Epibrassinolide on the Physiological Characteristics of Peanut Seedlings Under Cadmium Stress

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Pedosphere 2019年第1期29卷 45-59页

作者： DONG yuanjie CHEN Weifeng BAI Xiaoying LIU Fengzhen WAN Yongshan College of Resources and Environment National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Shandong Agricultural University College of Agronomic Sciences Shandong Agricultural University

Cadmium(Cd) is highly toxic to plants, animals, and humans. Limited information is available on the role of nitric oxide(NO)and/or 24-epibrassinolide(EBR) in response of plants to Cd stress. In this study, a hydroponic experiment was performed to investigate the effects of NO and/or EBR on peanut plants subjected to Cd stress(200 μmol L^(-1)) with sodium nitroprusside(SNP, an exogenous NO donor)(250 μmol L^(-1)) and/or EBR(0.1 μmol L^(-1)) addition. The results showed that Cd exposure inhibited plant growth, and this stress was alleviated by exogenous NO or EBR, and especially the combination of the two. Treatment with Cd inhibited the growth of peanut seedlings, decreased chlorophyll content, and significantly increased the Cd concentration in plants. Furthermore, the concentration of reactive oxygen species(ROS) markedly increased in peanut seedlings under Cd stress, resulting in the accumulation of malondialdehyde(MDA) and proline in leaves and roots. Under Cd stress, applications of SNP, EBR, and especially the two in combination significantly reduced the translocation of Cd from roots to leaves, increased the chlorophyll content, decreased the concentrations of ROS, MDA, and proline, and significantly enhanced the activities of superoxide dismutase(SOD), peroxidase(POD), and catalase(CAT) in peanut seedlings. Exogenous NO and/or EBR also stimulated the activities of nitrate reductase(NR)and nitric oxide synthase(NOS) and increased the contents of antioxidants, such as ascorbic acid(AsA) and reduced glutathione(GSH). Furthermore, exogenous NO and/or EBR enhanced Cd accumulation in the cell wall and thus decreased Cd distribution in the organelles in the roots. The concentrations of calcium(Ca), iron(Fe), magnesium(Mg), and zinc(Zn) were also regulated by exogenous NO or EBR, and especially by the two in combination. These results indicated that SNP and EBR, alone and particularly in combination, can mitigate the negative effects of Cd stress in peanut plants.

关键词： antioxidant system cadmium toxicity cadmium translocation cadmium uptake heary metal mineral element sodium nitroprusside

Measure synchronization in hybrid quantum-classical systems

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Chinese Physics B 2022年第12期31卷 111-116页

作者： Haibo Qiu yuanjie Dong Huangli Zhang Jing Tian School of Science Xi’an University of Posts and TelecommunicationsXi’an 710121China

Measure synchronization in hybrid quantum-classical systems is investigated in this *** dynamics of the classical subsystem is described by the Hamiltonian equations,while the dynamics of the quantum subsystem is governed by the Schr¨odinger *** increasing the coupling strength in between the quantum and classical subsystems,we reveal the existence of measure synchronization in coupled quantum-classical dynamics under energy conservation for the hybrid systems.

关键词： measure synchronization quantum measure synchronization hybrid quantum-classical systems

Electrochemical Corrosion Behavior and Mechanical Response of Selective Laser Melted Porous Metallic Biomaterials

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Acta Metallurgica Sinica(English Letters) 2023年第8期36卷 1235-1246页

作者： Kai Hu Lei Zhang yuanjie Zhang Bo Song Shifeng Wen Qi Liu Yusheng Shi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Mechanical Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina AVIC Manufacturing Technology Institute Science and Technology on Power Beam Processes LaboratoryBeijing Key Laboratory of High Power Beam Additive Manufacturing Technology and EquipmentAeronautical Key Laboratory for Additive Manufacturing TechnologiesBeijing100024China

The porous metallic biomaterials have attracted significant attention for implants because their lower young's modulus matches the human bones, which can eliminate the stress shielding effect and facilitate the growth of bone tissue cells. The porous metallic biomaterials fabricated by selective laser melting (SLM) have broad prospects, but the surface of the SLM-built porous structure has been severely adhered with unmelted powders, which affects the forming accuracy and surface quality. The porous metallic biomaterials face the corrosion problem of complex body fluid environments during service, so their corrosion resistance in the human body is extremely important. The surface quality will affect the corrosion resistance of the porous metallic biomaterials. Therefore, it is necessary to study the effect of post-treatment on the corrosion resistance of SLMed samples. In this work, the mechanical response and the electrochemical corrosion behavior in simulated body fluid of diamond and pentamode metamaterials Ti-6Al-4V alloy fabricated by SLM before and after sandblasting were studied. After sandblasting, the mechanical properties of the two porous metallic biomaterials were slightly improved, and the self-corrosion potential and pitting potential were more negative;meanwhile, the self-corrosion current density and passive current density increased, indicating that its corrosion performance decreased, and the passive film stability of sandblasted samples got worse.

关键词： Selective laser melting Porous metallic biomaterials Mechanical behavior Electrochemical corrosion behavior Ti-6A1-4V

Co-pyrolysis characteristics of typical components of waste plastics in a falling film pyrolysis reactor

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2176-2184页

作者： Zechen Jin Lijie Yin Dezhen Chen yuanjie Jia Jun Yuan Yuyan Hu Thermal and Environmental Engineering Institute Tongji University Shanghai 200092 China Shanghai Municipal Engineering Design Institute (Group) Co. Ltd. Shanghai 200092 China

Waste plastics mainly come from MSW and usually exist in the form of mixed plastics. During the co-pyrolysis process of mixed plastics, various plastic components have different physicochemical properties and reaction mechanisms. Considering the high viscosity and low thermal conductivity of molten plastics, a falling film pyrolysis reactor was selected to explore the rapid co-pyrolysis process of typical plastic components(PP, PE and PS).The oil and gas yields and the compositions of pyrolysis products of the three components under different ratios at pyrolysis temperatures were analyzed to explore the co-pyrolysis characteristics of PP, PE, and PS. The study is of great significance to the recycling of waste plastics.

关键词： Co-pyrolysis Falling film reactor Waste plastics