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Superparamagnetic iron oxide nanoparticles assembled magnetic nanobubbles and their application for neural stem cells labeling

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Journal of Materials Science & Technology 2021年第4期63卷 124-132页

作者： Jing Li Zhenqiang feng Ning gu Fang Yang State Key Laboratory of Bioelectronics Jiangsu Key Laboratory for Biomaterials and DevicesSchool of Biological Sciences and Medical EngineeringSoutheast UniversityNanjing 210096China

Micro/nanobubbles for use as ultrasound contrast agents have been fabricated with different shell *** various biomedical nanoparticles have been embedded in the shells of bubbles,the composite structures have shown promising applications in multi-modal imaging,drug/gene delivery,and biomedical *** this study,we developed a new gas-liquid interface self-assembly method to prepare magnetic nanobubbles embedded with superparamagnetic iron oxide nanoparticles(SPIONs).The diameter of the generated assembled nanobubbles was 227.40±87.21 nm with a good polydispersity index(PDI)of *** the condition of 150 compression cycles,the nanobubble concentration could reach about 6.12×10^(9)/*** electron microscopy(TEM)and scanning electronic microscopy(SEM)demonstrated that the assembled nanobubbles had a hollow gas core with SPIONs adsorbed on the ***(US)imaging and magnetic resonance imaging(MRI)experiments indicated that the assembled magnetic nanobubbles exhibited good US and MR contrast ***,the assembled magnetic nanobubbles were used to label neural stem cells under ultrasound *** 40 s US exposure,the magnetic nanobubbles could be delivered into cells with 2.80 pg Fe per cell,which could be observed in the intracellular endosome by *** with common incubation methods,the ultrasound exposure method did not introduce the potential cytotoxicity of transfection reagents and the efficiency was about twice as high as the efficiency of ***,the assembled magnetic nanobubbles prepared through the pressure-driven gas-liquid interface assembly approach could be a potential US/MRI dual model imaging nanocarrier for regenerative applications.

关键词： magnetic shells bubble

Transient analysis on surface heated piezoelectric semiconductor plate lying on rigid substrate

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Applied Mathematics and Mechanics(English Edition) 2022年第12期43卷 1841-1856页

作者： Luke ZHAO Sen gu Yaqin SONG feng JIN State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi'an Jiaotong UniversityXi'an 710049China

Based on the thermo-electro-elastic coupling theory,the mathematical model for a surface heated piezoelectric semiconductor(PS)plate is developed in the time *** the direct and inverse Laplace transformations to the established model,the mechanical and electrical responses are *** comparison between the analytical solution and the finite element method(FEM)is conducted,which illustrates the validity of the *** calculated results show that the maximum values of the mechanical and electrical fields appear at the heating ***,the perturbation carriers tend to concentrate in the zone near the heating surface under the given boundary *** can also be observed that the heating induced elastic wave leads to jumps for the electric potential and perturbation carrier density at the *** the thermal relaxation time is introduced,all the field quantities become smaller because of the thermal lagging ***,it can be found that the thermal relaxation time can describe the smooth variation at the jump ***,for a plate with P-N junction,the effect of the interface position on the electrical response is *** effects of the initial carrier density on the electrical properties are discussed in *** conclusions in this article can be the guidance for the design of PS devices serving in thermal environment.

关键词： thermo-electro-elastic coupling piezoelectric semiconductor(PS) surface heating transient analysis

Thermal stability improvement of sprayable fast-responding pressure-sensitive paint for measurement above 100℃

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Chinese Journal of Aeronautics 2021年第1期34卷 320-326页

作者： Di PENG feng gu Zhe ZHONG Yingzheng LIU Key Lab of Education Ministry for Power Machinery and Engineering School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Gas Turbine Research Institute Shanghai Jiao Tong UniversityShanghai 200240China

The thermal stability of sprayable fast-responding Pressure-Sensitive Paint(fast PSP)was investigated to explore the possibility for application in turbomachinery and hypersonic research with temperature above 100℃.The first part of the study focused on a widely-used Polymer Ceramic PSP(PC-PSP).The effects of thermal degradation on its key sensing properties,including luminescent intensity,pressure sensitivity and response time,were examined for a temperature range from 60 to 100℃.Severe degradation in intensity and pressure sensitivity was found as temperature reached 70℃or higher,which would cause failure of PSP application in these ***,a fast-responding Mesoporous-Particle PSP(MP-PSP)was developed which did not show degradation effects until 140℃.The greatly improved thermal stability of MP-PSP was attributed to:selection of polymer with higher glass transition temperature(polystyrene)to delay the saturation effect of oxygen quenching as temperature increased;porous and hollow structure of particles for luminophore deposition that minimizes polymer–luminophore *** new paint formulation has significantly raised the upper temperature limit of fast PSP and offers more opportunities for applications in harsh environment.

关键词： Dynamic response Polymer–luminophore interaction Pressure sensitivity Pressure-sensitive paint Thermal degradation

Existence and Nonexistence of Global Positive Solutions for a Weakly Coupled P-Laplacian System

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Acta Mathematicae Applicatae Sinica 2013年第3期29卷 541-554页

作者： xian-zhong ZENG Zhen-hai LI Yong-geng gu School of Mathematics and Computing Science Hunan University of Science and Technology College of Science Guangxi University for Nationalities Department of Mathematics Hunan Normal University

In this paper, we deal with a weakly coupled evolution P-Laplacian system with inhomogeneous terms. We obtain a critical criterion concerning existence and nonexistence of its global positive solutions. Such a criterion is different from that of the weakly coupled evolution P-Laplacian system with homogeneous terms. Further, we demonstrate existence and nonexistence of its global positive solutions.

关键词： the evolution P-Laplacian system inhomogeneous terms blow-up global existence

A Lightweight UAV Visual Obstacle Avoidance Algorithm Based on Improved YOLOv8

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Computers, Materials & Continua 2024年第11期81卷 2607-2627页

作者： Zongdong Du Xuefeng feng feng Li Qinglong xian Zhenhong Jia College of Computer Science and Technology Xinjiang UniversityUrumqi830046China Signal Detection and Processing Autonomous Region Key Laboratory Xinjiang UniversityUrumqi830046China Xinjiang Uygur Autonomous Region Research Institute of Measurement and Testing Urumqi830000China

The importance of unmanned aerial vehicle(UAV)obstacle avoidance algorithms lies in their ability to ensure flight safety and collision avoidance,thereby protecting people and *** propose UAD-YOLOv8,a lightweight YOLOv8-based obstacle detection algorithm optimized for UAV obstacle *** algorithm enhances the detection capability for small and irregular obstacles by removing the P5 feature layer and introducing deformable convolution v2(DCNv2)to optimize the cross stage partial bottleneck with 2 convolutions and fusion(C2f)***,it reduces the model’s parameter count and computational load by constructing the unite ghost and depth-wise separable convolution(UGDConv)series of lightweight convolutions and a lightweight detection *** on this,we designed a visual obstacle avoidance algorithm that can improve the obstacle avoidance performance of UAVs in different *** particular,we propose an adaptive distance detection algorithm based on obstacle attributes to solve the ranging problem for multiple types and irregular obstacles to further enhance the UAV’s obstacle avoidance *** verify the effectiveness of the algorithm,the UAV obstacle detection(UAD)dataset was *** experimental results show that UAD-YOLOv8 improves mAP50 by 3.4%and reduces GFLOPs by 34.5%compared to YOLOv8n while reducing the number of parameters by 77.4%and the model size by 73%.These improvements significantly enhance the UAV’s obstacle avoidance performance in complex environments,demonstrating its wide range of applications.

关键词： Unmanned aerial vehicle obstacle detection obstacle avoidance algorithm

零信任环境下的多层次身份认证数据流安全检测算法

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现代电子技术 2025年第1期48卷 85-89页

作者：顾健华冯建华高泽芳文成江清华大学计算机科学与技术系北京100084 中国移动通信集团终端有限公司北京100053

身份认证数据流中的敏感信息可能在传输过程中被攻击者截获,并用于恶意目的,导致隐私泄露、身份盗用等风险,为确保网络安全性,提高主体身份认证安全性,提出零信任环境下的多层次身份认证数据流安全检测算法。采用改进的文档指纹检测算... 详细信息

身份认证数据流中的敏感信息可能在传输过程中被攻击者截获,并用于恶意目的,导致隐私泄露、身份盗用等风险,为确保网络安全性,提高主体身份认证安全性,提出零信任环境下的多层次身份认证数据流安全检测算法。采用改进的文档指纹检测算法实现多层次身份认证过程中主体和客体交互数据流安全监测。通过Rabin-Karp算法实现身份认证数据文档的分块,采用Winnow算法划分身份认证数据分块文档边界后,得到身份认证数据文档指纹,将其与指纹库中的指纹进行匹配对比,识别出多层次身份认证数据流中的异常数据,实现多层次身份认证数据流安全检测。实验结果表明,该算法具有较好的身份认证数据流安全检测能力,有效地降低了网络威胁频率,提升了网络安全性。

关键词：零信任多层次身份认证数据流安全检测文档指纹检测算法 Rabin-Karp算法 Winnow算法

Catalytic Oxidation of NO over La_(0.8)Sr_(0.2)MnO_3 Perovskite

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Chemical Research in Chinese Universities 2008年第5期24卷 620-627页

作者： ZHAO Ying-xian WEI feng YU Ying Ningbo Institute of Technology Zhejiang University Ningbo 315100 P. R. China

Catalytic oxidation of NO by O2 over La0.8Sr0.2MnO3 was tested in a tubular *** reaction temperature ranged from 373 to 473 K,space time from 0.090 to 0.720 s,inlet NO concentration from 300 to 2000μL/L, and O2 volume fraction from 3%to 9%.The steady-state conversion of NO was increased significantly with increasing reaction temperature and the space time,slightly with increasing the O2 concentration but decreased with increasing the inlet NO concentration at a lower *** the conditions of 0.720 s space time,500μL/L NO concentration, 5%O2 volume fraction and 473 K,NO conversion reached 90%.A kinetic model including a network of 12 elementary reactions with the desorption of NO2 as the rate-limiting step is established and fits the experimental data *** activation energy of NO2 desorption from the catalyst surface is determined to be 101 kJ/mol.

关键词： Catalytic oxidation Nitric oxide La0.8Sr0.2MnO3 catalyst Kinetics

Optimal allocation of hybrid energy storage for microgrids based on multi-attribute utility theory

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Journal of Modern Power Systems and Clean Energy 2018年第1期6卷 107-117页

作者： Xiaoshan feng Jie gu Xuefei guAN School of Electronic Information and Electrical EngineeringShanghai Jiao Tong University Research Center of New Technology Shanghai Electric Power Design Institute

To satisfy the requirements of high energy density,high power density,quick response and long lifespan for energy storage systems(ESSs),hybrid energy storage systems(HESSs)have been investigated for their complementary characteristics of‘high energy density components’and‘high power density components’.To optimize HESS combinations,related indices such as annual cost,fluctuation smoothing ability as well as safety and environmental impact have to be *** multiattribute utility method investigated in this paper is aimed to draw an overall conclusion for HESS allocation optimization in *** on multi-attribute utility theory,this method has significant advantages in solving the incommensurability and contradiction among multiple *** of determining the weights of various attributes subjectively,when adopting the multi-attribute utility method,the characteristics of attributes and the relation among them can be investigated ***,the proper utility function and merging rules are identified to achieve the aggregate utility which can reflect comprehensive qualities of HESSs.

关键词： Hybrid energy storage system(HESS) Capacity optimization Multi-attribute utility theory HESS combination evaluation Utility function

Ag-doped CNT/HAP nanohybrids in a PLLA bone scaffold show significant antibacterial activity

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Bio-Design and Manufacturing 2024年第2期7卷 105-120页

作者： Cijun Shuai Xiaoxin Shi Kai Wang Yulong gu feng Yang Pei feng State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China College of Mechanical Engineering Xinjiang UniversityUrumqi 830017China

Bacterial infection is a major problem following bone implant ***,poly-l-lactic acid/carbon nanotube/hydroxyapatite(PLLA/CNT/HAP)bone scaffolds possess enhanced mechanical properties and show good ***,wesynthesizedsilver(Ag)-dopedCNT/HAP(CNT/Ag-HAP)nanohybrids via the partial replacing of calcium ions(Ca2+)in the HAP lattice with silver ions(Ag+)using an ion doping technique under hydrothermal ***ﬁcally,the doping process was induced using the special lattice structure of HAP and the abundant surface oxygenic functional groups of CNT,and involved the partial replacement of Ca2+in the HAP lattice by doped Ag+as well as the in situ synthesis of Ag-HAP nanoparticles on CNT in a hydrothermal *** result-ing CNT/Ag-HAP nanohybrids were then introduced into a PLLA matrix via laser-based powder bed fusion(PBF-LB)to fabricate PLLA/CNT/Ag-HAP scaffolds that showed sustained antibacterial *** then found that Ag+,which pos-sesses broad-spectrum antibacterial activity,endowed PLLA/CNT/Ag-HAP scaffolds with this activity,with an antibacterial effectiveness of 92.65%.This antibacterial effect is due to the powerful effect of Ag+against bacterial structure and genetic material,as well as the physical destruction of bacterial structures due to the sharp edge structure of *** addition,the scaffold possessed enhanced mechanical properties,showing tensile and compressive strengths of 8.49 MPa and 19.72 MPa,***,the scaffold also exhibited good bioactivity and cytocompatibility,including the ability to form apatite layers and to promote the adhesion and proliferation of human osteoblast-like cells(MG63 cells).

关键词： Ag-doped Carbon nanotube/hydroxyapatite(CNT/HAP) Antibacterial properties Bone scaffold