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Carbon dots-peroxyoxalate micelle as a highly luminous chemiluminescence system under physiological conditions

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Chinese Chemical Letters 2021年第12期32卷 3931-3935页

作者： Chi zhang JingjingJin Ke Liu Xuejuan Ma xinfeng zhang College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China

Chemiluminescence(CL) has been widely used for bioanalysis owing to its high sensitivity, low background and simplicity. However, most of the CL systems need acidic/alkaline conditions or organic solvent to enhance their luminescent efficiency, and the non-physiological conditions can usually lead to the misfunction of biomolecules during biosensing. Herein, we report a highly luminous CL system under physiological conditions based on carbon dots-bis(2-carbopentyloxy-3,5,6-trichlorophenyl) oxalate(CDsCPPO) micelles, and further used it in biosensing application. In the CL system, the amphiphilic surfactant packed CPPO and hydrophobic CDs together to form CDs-CPPO micelles. Such micelles solution not only isolated the CPPO from water to prevent its hydrolysis but also made the close proximity between CPPO and CDs, thus significantly enhancing the CDs quantum yield. The CL quantum yield was calculated to be 5.26 × 10^(-4) einsteins/mol, about 200-fold higher than that of the most commonly used luminol CL system. The oxidases(e.g., glucose oxidase) were tested to be susceptible to the organic solvent and non-physiological p H. Hence, the CL system was used for the detection of oxidase substrates(exemplified by glucose) in serum samples, and the limit of detection was as low as 8.4 nmol/L. The highly luminous CL system that can work under physiological conditions is promising for biosensing applications.

关键词： Carbon dots Chemiluminescence Micelle Oxidase

Observation of internal tides and near-inertial motions in the upper 450 m layer of the northern South China Sea

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Chinese Science Bulletin 2005年第24期50卷 2890-2895页

作者： LIANG xinfeng zhang Xiaoqian TIAN Jiwei Physical Oceanography Laboratory of Ocean University of China Qingdao 266003 China

Mooring ADCP current observations from Au- gust to November are used to study the barotropic tides, baroclinic tides and near-inertial motions in the upper 450 m layer of the northern South China Sea. The barotropic and baroclinic tides at the mooring station are all dominated by M2, K1, O1, P1, with the barotropic amplitudes being 7.8 cm·s?1, 7.0 cm·s?1, 5.4 cm·s?1 and 3.5 cm·s?1 respectively. The amplitudes of M2, K1, O1, P1 internal tides vary greatly, which are 12―15 cm·s?1 in the thermocline, and then decrease with increasing depth. The amplitude of the barotropic near-iner- tial motions is less than 1 cm·s?1, contributing little to the barotropic currents. However, that of the baroclinic near- inertial motions can be as large as 5 cm·s?1. The inclination of tidal ellipse tends to increase with increasing depth, implying upward propagation of energy, while that of the near-inertial ellipse tends to decrease with increasing depth, implying downward propagation of energy.

关键词：中国南海内潮惯性运动上层海水

Rare earth complexes chemiluminescence catalyzed by gold nanoparticles for fast sensing of Tb^(3+)and Eu^(3+)

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Chinese Chemical Letters 2023年第9期34卷 275-279页

作者： Jiajia Yuan Xiaoya Fan Jiacheng Yang xinfeng zhang State Key Lab of Geohazard Prevention&Geoenvironment Protection College of Materials and Chemistry&Chemical EngineeringChengdu University of TechnologyChengdu 610059China

Developing multiplex sensing technique is of great significance for fast sample ***,the broad emissions of most chemiluminescence(CL)luminophores make the multiplex CL analysis be *** this work,a simple and sensitive CL analytical method has been developed for the simultaneous determination of Tb^(3+)and Eu^(3+)thanking to their narrow band *** technique was based on a mixed CL system of periodate(IO4-)-hydrogen peroxide(H_(2)O_(2))-rare earth complexes,in which the reactive oxygen species(ROSs)especially singlet oxygen(^(1)O_(2))can transfer its energy to the complex of Tb^(3+)/Eu^(3+)-ethylenediaminetetraacetic acid disodium salt(EDTA)and then produce the characteristic emissions of Tb^(3+)and Eu^(3+)without *** further experiment found that the CL emissions of Tb^(3+)and Eu^(3+)could be catalyzed by the gold nanoparticles(AuNPs)via enhancing the yield of^(1)O_(2).The CL intensities of Tb^(3+)(at 490 nm)and Eu^(3+)(at 620 nm)increased linearly with concentration of Tb^(3+)and Eu^(3+).After the optimization of the CL sensing conditions,the limits of detection(LOD)were 5.0×10^(-9)mol/L and 8.0×10^(-7)mol/L for Tb^(3+)and Eu^(3+),***,the method has been applied for measuring the contents of Tb^(3+)and Eu^(3+)in leaching solution of mine sample and Tb^(3+)/Eu^(3+)-contained nanomaterials with satisfactory *** present system provides a new CL technique for multiplex sensing with simplicity and high sensitivity.

关键词： Gold nanoparticles Rare earth ions Chemiluminescence Multiplex analysis Fast sensing

Application of Numerical Simulation for Analysis of Sinking Characteristics of Purse Seine

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Journal of Ocean University of China 2015年第1期14卷 135-142页

作者： ZHOU Cheng XU Liuxiong zhang xinfeng YE Xuchang College of Marine Sciences Shanghai Ocean University Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of Education Shanghai Ocean University National Engineering Research Center for Oceanic Fisheries Shanghai Collaborative Innovation Center for Oceanic Fisheries

This study applies the mass-spring system to model the dynamic behavior of a submerged net panel similar to the shooting process in actual purse seine fishing operation. Modeling indicates that there is insufficient stretching with the net panel under the floatline in the prophase of the shooting process. Sinkers at different locations along the leadline descend successively after submergence, and the sinking speed decreases gradually with elapsed time until attainment of a stable state. Designs with different current speeds and sinker weights are executed to determine the dimensional shape and sinking characteristics of the net. The net rigged with greater sinker weight gains significantly greater sinking depth without water flow. Compared with the vertical spread of the net wall in static water, the middle part of the netting presents a larger displacement along the direction of current under flow condition. It follows that considerable deformation of the netting occurs with higher current speed as the sinkers affected by hydrodynamic force drift in the direction of current. The numerical model is verified by a comparison between simulated results and sea measurements. The calculated values generally coincide with the observed ones, with the former being slightly higher than the latter. This study provides an implicit algorithm which saves computational loads for enormous systems such as purse seines, and ensures the accuracy and stability of numerical solutions in a repetitious iteration process.

关键词： numerical simulation mass-point model purse seine sinking characteristics

Surface molecular imprinting on g-C3N4 photooxidative nanozyme for improved colorimetric biosensing

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Chinese Chemical Letters 2019年第12期30卷 2186-2190页

作者： Yuanheng Wu Qiang Chen Shuang Liu Hua Xiao Menglin zhang xinfeng zhang College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China College of Environment and Ecology Chengdu University of TechnologyChengdu 610059China

Graphitic carbon nitride(g-C3 N4),as a visible-light-active organic semiconductor,has attracted growing attentions in photocatalysis and photoluminescence-based ***,we demonstrated the intrinsic photooxidase activity of g-C3 N4 and then surface molecular imprinting on g-C3 N4 nanozymes was achieved for improved *** blue LED irradiation,the g-C3 N4 exhibited superior enzymatic activity for oxidation of chromogenic substrate like 3,3’,5,5’-tetramethylbenzidine(TMB)without destructive H2 *** oxidation was mainly ascribed to ·O2^-that was generated during light *** surface molecular imprinting on g-C3 N4 can lead to an over 1000-fold alleviation in matrix-interference from serum samples,4-fold improved enzymatic activity as well as enhanced substrate specificity comparing with bare g-C3 N4 during colorimetric ***,the MIP-g-C3 N4 possesses a high affinity to TMB with a Km value of only 22 μmol/L,much lower than other comment nanozymes like AuNPs,Fe3 O4 NPs,*** was successfully applied for detection of cysteine in serum sample with satisfactory recoveries.

关键词： Molecularly imprinted polymer Graphitic carbon nitride Nanoenzyme Colorimetry Biosensing

Dynamic Simulation of Pelagic Longline Retrieval

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Journal of Ocean University of China 2019年第2期18卷 455-466页

作者： SONG Liming QI Yukun LI Jie SHEN Zhibin zhang xinfeng SHEN Xi College of Marine Sciences Shanghai Ocean University National Engineering Research Centre for Oceanic Fisheries Shanghai Ocean University Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources (Shanghai Ocean University) Ministry of Education Collaboration Innovation Center for National Distant-Water Fisheries

To improve fishing gear efficiency, it is important to understand the interactions among sea current, fishing vessel, line hauler, and catches during pelagic longline gear retrieval. In this study, fishing gear configuration parameters, operational parameters, and 3 D ocean current data were collected from Indian Ocean. Dynamic models of pelagic longline gear retrieval were built using the lumped mass method and solved using the Euler-Trapezoidal method. From the results, the pulling force of line hauler exerted on the gear was 2800–3600 N. There were no significant differences(P > 0.05) between the time of the hook retrieval measured at sea and that obtained from the simulation. The absolute values of the movement velocity at representative nodes along the X, Y, and Z axes were 0.01–25.5 m s^(-1). These results suggest that the dynamic model of longline fishing gear retrieval can be used to analyze the interactions among sea current, fishing vessel, line hauler, longline gear, and catches, and to acquire the basic data for optimizing the design of the line hauler. Moreover, the model can serve as a reference to study the hydrodynamic performance of other fishing gears during the hauling process.

关键词： pelagic longline retrieval dynamic simulation visualization

MEMS Gyroscopes Development and Application Overview on Intelligent Vehicles 32

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MEMS Gyroscopes Development and Application Overview on Inte...

第32届中国控制与决策会议

作者： zhang xinfeng Fan Jingjing Li Zhipeng Zhao Mengtong Technical Center of Dongfeng Motor Intelligent Transportation Key Laboratory North China University of Technology China North Engine Research Institute

ISBN: (数字)9781728158556

ISBN: (纸本)9781728158563

With the development of automobile intelligence and automatic driving, the measurement of vehicle motion angular velocity is not only of great significance for improving the active safety, intelligent control and comfort of automobiles, but also an indispensable reference for the control of automatic or unmanned automobiles. Firstly, aiming at the requirements of chassis safety control, navigation control, lane keeping, passive safety and other automotive electronic control systems for angular velocity measurement in Intelligent vehicles, this paper studies, analyzes and compares the characteristics and application status of various micro-electromechanical gyroscopes, and the principle and performance of micro-electromechanical gyroscopes, including micro-vibration gyroscopes, fluid gyroscopes, solid micro-gyroscopes, suspended rotor micro-gyroscopes, optical micro-gyroscopes, atomic gyroscopes. This paper holds that micro-vibration gyroscopes, fluid gyroscopes, solid micro-gyroscopes and electrostatic suspension rotor micro-gyroscopes are most likely to be used in automobile systems in the short term, while atomic gyroscopes have good research prospects.

关键词： Intelligent Vehicle Angular rate measure Gyroscope MEMS

来源： cnki会议评论

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松材线虫胁迫对5种松树的代谢组共性表达

东北林业大学学报 2025年第2期53卷 158-170页

作者：游丰黄瑞芬张歆逢吴思琪于海英刘雨晴国家林业和草原局生物灾害防控中心沈阳110034 基因赛奥(大连)生物科技发展有限公司

为研究松树在松材线虫胁迫下的分子防御机制,分别选取15~20年生的辽宁抚顺的油松(LY)、辽宁抚顺的红松(LH)、山东威海的赤松(SC)、山东威海的黑松(SH)、湖南长沙的马尾松(HM)5种代表性松树作为研究对象,运用液相色谱-质谱联用技术的非... 详细信息

为研究松树在松材线虫胁迫下的分子防御机制,分别选取15~20年生的辽宁抚顺的油松(LY)、辽宁抚顺的红松(LH)、山东威海的赤松(SC)、山东威海的黑松(SH)、湖南长沙的马尾松(HM)5种代表性松树作为研究对象,运用液相色谱-质谱联用技术的非靶向代谢组学,将以上5种松树分为健康组和感病组,分别对5组松树样本的差异代谢物分布情况、差异代谢物的共性特征、共有差异代谢物的表达显著性、代谢通路富集分布情况、差异性代谢通路的共性特征等进行研究。结果表明:5种松树感染松材线虫后的代谢产物在苯和取代衍生物、羧酸及其衍生物、脂肪酰基、酚类、孕烯醇酮脂类、类固醇及其衍生物、其他类等7类化合物中分布较为集中;HM、LH、LY和SC,HM、LY、SC和SH这两种组合,只有1种共有的显著性差异代谢物,分别是百里酚和6-姜酮酚,5种松树以及剩下的其他4种松树的组合都没有共有的显著性差异代谢物;HM、LY、SC和SH感染松材线虫后,6-姜酮酚表达量显著升高,LH感染松材线虫后,6-姜酮酚表达量无显著性差异;HM、SC、LY和LH感染松材线虫后,百里酚表达量显著升高,SC感染松材线虫后,百里酚表达量无显著性差异;HM、LH、LY、SC、SH分别富集到51、55、46、71、43条差异显著的信号通路,5种松树共有的差异显著的信号通路共有19条,主要反映在植物的抗逆相关信号通路上,包括花生四烯酸代谢、亚油酸代谢、苯丙烷生物合成、多种氨基酸代谢等。

关键词：松材线虫代谢组百里酚 6-姜酮酚

Lossy Point Cloud Attribute Compression with Subnode-Based Prediction

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ZTE Communications 2023年第4期21卷 29-37页

作者： YIN Qian zhang xinfeng HUANG Hongyue WANG Shanshe MA Siwei School of Computer Science Peking UniversityBeijing 100871China School of Computer Science and Technology University of the Chinese Academy of SciencesBeijing 100049China

Recent years have witnessed that 3D point cloud compression(PCC)has become a research hotspot both in academia and *** in industry,the Moving Picture Expert Group(MPEG)has actively initiated the development of PCC *** of the adopted frameworks called geometry-based PCC(G-PCC)follows the architecture of coding geometry first and then coding attributes,where the region adaptive hierarchical transform(RAHT)method is introduced for the lossy attribute *** upsampled transform domain prediction in RAHT does not sufficiently explore the attribute correlations between neighbor nodes and thus fails to further reduce the attribute redundancy between neighbor *** this paper,we propose a subnode-based prediction method,where the spatial position relationship between neighbor nodes is fully considered and prediction precision is further *** utilize some already-encoded neighbor nodes to facilitate the upsampled transform domain prediction in RAHT by means of a weighted average *** results have illustrated that our proposed attribute compression method shows better rate-distortion(R-D)performance than the latest MPEG G-PCC(both on reference software TMC13-v22.0 and GeS-TM-v2.0).

关键词： point cloud compression MPEG G-PCC RAHT subnode-based prediction

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