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Enhancing sensitivity of SERRS nanoprobes by modifying heptamethine cyanine-based reporter molecules

Journal of Innovative Optical Health Sciences 2016年第4期9卷 85-93页

作者： yunfei zhang Danqi Li Xingyu Zhou Xihui Gao Shengyuan Zhao Cong Li Key Laboratory of Smart Drug Delivery Ministry of Education&PLA School of Pharmacy Fudan University826 Zhangheng Rd.Shanghai201203P.R.China First Clinical College of Tongji Medical College Huazhong University of Science and Technology 13 Hangkong Rd. WuhanHubei430030P.R.China

Surface enhanced resonance Raman scattering(SERRS)is a physical phenomenon that occurs when the energy of incident light is dose to that of electronic excitation of reporter molecules(RMs)attached on *** has showed great promise in healthcare applications such as tumor diagnosis,image guided tumor surgery and real-time evaluation of therapeutic response due to its ultra-sensitivity,manipulating convenience and easy *** the most widely used organic near-infrared(NIR)fuorophore,heptamethine cyanines possess the electronic ex-citation energy that is close to the plasmon absorption energy of the gold nano scafolds,which results in the extraordinary enhancement of the SERRS ***,the effect of hepta-methine cyanine structure and the gold nanoparticle morphology to the SERRS intensity are barely *** work developed a series of SERRS nanoprobes in which two hepta-methine cyanine derivatives(IR783 and IR780)were used as the RM and three gold nanoparticles(nanorod,nanosphere and nanostar)were used as the ***,even though IR780 and IR783 possess very similar chemical structure,SERRS signal produced by IR780 was determined as 14 times higher than that of IR783 when the RM concentration was6.5 × 10^(-6) *** contrast,less than 4.0 fold SERRS signal intensity increase was measured by changing the substrate *** experimental results indicate that finely tuning the chemical structure of the heptamethine cyanine could be a feasible way to develop robust SERRS probes to visualize tumor or guide tumor resection with high sensitivity and target to background ratio.

关键词： Surface enhanced resonance Raman scattering gold nanoparticles reporter molecules heptamethine cyanine.

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Development of MoS_(2)-stainless steel catalyst by 3D printing for efficient destruction of organics via peroxymonosulfate activation

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Journal of Environmental Sciences 2024年第1期135卷 108-117页

作者： Yufeng Liu Jianhui Xu Xin Fu Pengxu Wang Dan Li yunfei zhang Shenggui Chen Chunhui zhang Peng Liu School of Environment and Civil Engineering Dongguan University of TechnologyDongguan 523808China School of Art and Design Guangzhou Panyu PolytechnicGuangzhou 511483China Dongguan Institute of Science and Technology Innovation Dongguan University of TechnologyDongguan 523808China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China

Herein,a novel MoS_(2)-stainless steel composite material was first synthetized via a 3D printing method(3DP MoS_(2)-SS)for peroxymonosulfate(PMS)activation and organics *** with MoS_(2)-SS powder/PMS system(0.37 g/(m^(2)/min)),4.3-fold higher k_(FLO)/S_(BET)value was obtained in 3DP MoS_(2)-SS/PMS system(1.60 g/(m^(2)/min),resulting from the superior utilization of active *** observed that 3DP MoS_(2)-SS significantly outperformed the 3DP SS due to the enhanced electron transfer rate and increased active ***,Mo^(4+)facilitated the Fe^(2+)/Fe^(3+)cycle,resulting in the rapid degradation of florfenicol(FLO).Quenching experiments and electron paramagnetic resonance spectra indicated that·OH,SO_(4)·^(-),O_(2)·^(-)and^(1)O_(2)were involved in the degradation of *** effect of influencing factors on the degradation of FLO were evaluated,and the optimized degradation efficiency of 98.69%was achieved at 1 mM PMS and pH of *** degradation products were detected by UPLC/MS analyses and several possible degradation pathways were proposed to be the cleavage of C-N bonds,dechlorination,hydrolysis,defluorination and *** addition,3DP MoS_(2)-SS/PMS system also demonstrated superior degradation performance for 2-chlorophenol,acetaminophen,ibuprofen and *** study provided deep insights into the MoS_(2)-SS catalyst prepared by 3DP technology for PMS activation and FLO-polluted water treatment.

关键词： 3D printing Stainless steel MoS_(2) Peroxymonosulfate activation Degradation mechanism

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Multi-agent mobile networking observation experiment at the air-sea interface of ocean eddy

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Science China Earth Sciences 2024年第10期67卷 3083-3097页

作者： Yi zhang Dongxiao WANG Li ZHOU Chunhua QIU yunfei zhang Zhiliang DENG Biao zhang Yunping LIU Yeqiang SHU Fenghua ZHOU Danian LIU Zhengqiu zhang School of Marine Sciences Sun Yat-Sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China School of Marine Technology and Geomatics Jiangsu Ocean UniversityLianyungang 222005China Zhuhai Yunzhou Intelligent Technology Co. Ltd.Research and Design CenterZhuhai 519000China School of Automation Nanjing University of Information Science&TechnologyNanjing 210044China School of Marine Sciences Nanjing University of Information Science&TechnologyNanjing 210044China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Current climate forecasting has advanced to the stage of investigating mesoscale air-sea interactions. Recent studies have identified significant structural differences between the cores and edges of mesoscale eddies;however, the effects of these structural variations on air-sea fluxes and the Marine Atmospheric Boundary Layer(MABL) remain underexplored. Traditional observations often fail to capture the detailed structures of eddies, necessitating enhanced observations at high spatiotemporal resolution for mesoscale eddies. To address this, efforts have been made to develop multi-agent platforms and expendable air-sea interface observation technologies. A task-oriented observation scheme was developed to monitor the spatial characteristics of mesoscale eddies. The South China Sea(SCS) is rich in mesoscale eddies with rapid motion changes, requiring enhanced observations of the air-sea interface using multi-agent mobile networking. An anticyclonic eddy was observed in the eastern region of the Xisha Islands in the SCS, and we examined variations in air-sea fluxes across different regions within the eddy.

关键词： Multi-agent Mobile networking Mesoscale eddy Air-sea interface Collaborative observation

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Numerical Simulation of Typhoon Muifa(2011) Using a Coupled Ocean-Atmosphere-Wave-Sediment Transport(COAWST) Modeling System

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Journal of Ocean University of China 2015年第2期14卷 199-209页

作者： LIU Na LING Tiejun WANG Hui zhang yunfei GAO Zhiyi WANG Yi Key Laboratory of Research on Marine Hazards Forecasting National Marine Environmental Forecasting Center

The newly developed Coupled Ocean-Atmosphere-Wave-Sediment Transport(COAWST) Modeling System is applied to investigate typhoon-ocean interactions in this study. The COAWST modeling system represents the state-of-the-art numerical simulation technique comprising several coupled models to study coastal and environmental processes. The modeling system is applied to simulate Typhoon Muifa(2011), which strengthened from a tropical storm to a super typhoon in the Northwestern Pacific, to explore the heat fluxes exchanged among the processes simulated using the atmosphere model WRF, ocean model ROMS and wave model SWAN. These three models adopted the same horizontal grid. Three numerical experiments with different coupling configurations are performed in order to investigate the impact of typhoon-ocean interaction on the intensity and ocean response to typhoon. The simulated typhoon tracks and intensities agree with observations. Comparisons of the simulated variables with available atmospheric and oceanic observations show the good performance of using the coupled modeling system for simulating the ocean and atmosphere processes during a typhoon event. The fully coupled simulation that includes a ocean model identifies a decreased SST as a result of the typhoon-forced entrainment. Typhoon intensity and wind speed are reduced due to the decrease of the sea surface temperature when using a coupled ocean model. The experiments with ocean coupled to atmosphere also results in decreased sea surface heat flux and air temperature. The heat flux decreases by about 29% compared to the WRF only case. The reduction of the energy induced by SST decreases, resulting in weakening of the typhoon. Coupling of the waves to the atmosphere and ocean model induces a slight increase of SST in the typhoon center area with the ocean-atmosphere interaction increased as a result of wave feedback to atmosphere.

关键词： COAWST modeling system typhoon Muifa WRF ROMS SWAN

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EARLY RECOGNITION OF INTERNET TRAFFIC BASED ON SIGNATURE INSPECTION

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Journal of Electronics(China) 2010年第2期27卷 230-236页

作者： Niu Xiaona Guo yunfei zhang Jin Wang Chao National Digital Switching System Engineering ＆ Technology Research Center （ NDSC） Zhengzhou 450002 China

The accurate and efficient classification of Internet traffic is the first and key step to ac-curate traffic management,network security and traffic analysis. The classic ways to identify flows is either inaccurate or inefficient,which are not suitable to be applied to real-time online classification. In this paper,we originally presented an early recognition method named Early Recognition Based on Deep Packet Inspection (ERBDPI) based on deep packet inspection,after analyzing the distribution of payload signature between packets of a flow in detail. The basic concept of ERBDPI is classifying flows based on the payload signature of their first some packets,so that we can identify traffic at the be-ginning of a flow connection. We compared the performance of ERBDPI with that of traditional sampling methods both synthetically and using real-world traffic traces. The result shows that ERBDPI can get a higher classification accuracy with a lower packet sampling rate,which makes it suitable to be applied to accurate real-time classification in high-speed links.

关键词： Traffic classification Packet sampling Payload signature inspection Early recognition

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Structural control of magnetic nanoparticles for positive nuclear magnetic resonance imaging

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Nuclear Science and Techniques 2024年第10期35卷 17-28页

作者： Zulaikha Ali yunfei zhang Michael GKaul Billy Truong Deepika Bhanot Gerhard Adam Yuan-Yuan Li He Wei Department of Chemistry and Biochemistry California State UniversityFresnoCA 93740USA Department of Diagnostic and Interventional Radiology and Nuclear Medicine Center for Radiology and EndoscopyUniversity Medical Center Hamburg-Eppendorf20246 HamburgGermany Chemical Sciences Division Oak Ridge National LaboratoryOak RidgeTN 37831USA

In addition to the tens of millions of medical doses consumed annually around the world,a vast number of nuclear magnetic resonance imaging(MRI)contrast agents are being deployed in MRI research and development,offering precise diagnostic information,targeting capabilities,and analyte *** iron oxide nanoparticles(SPIONs)are notable among these agents,providing effective and versatile MRI applications while also being heavy-metal-free,bioconjugatable,and *** designed and implemented a novel two-pronged computational and experimental strategy to meet the demand for the efficient and rigorous development of SPION-based MRI *** MATLAB-based modeling simulation and magnetic characterization revealed that extremely small maghemite SPIONs in the 1-3 nm range possess significantly reduced transversal relaxation rates(R_(2))and are therefore preferred for positive(T_(1)-weighted)***,X-ray diffraction and X-ray absorption fine structure analyses demonstrated that the diffraction pattern and radial distribution function of our SPIONs matched those of the targeted maghemite *** addition,simulations of the X-ray near-edge structure spectra indicated that our synthesized SPIONs,even at 1 nm,maintained a spherical ***,in vitro and in vivo MRI investigations showed that our 1-nm SPIONs effectively highlighted whole-body blood vessels and major organs in mice and could be cleared through the kidney route to minimize potential post-imaging side ***,our innovative approach enabled a swift discovery of the desired SPION structure,followed by targeted synthesis,synchrotron radiation spectroscopic studies,and MRI *** efficient and rigorous development of our high-performance SPIONs can set the stage for a computational and experimental platform for the development of future MRI agents.

关键词： Magnetic nanoparticles Structure control Nuclear magnetic resonance imaging Modeling simulation X-ray absorption fine structure

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3D-printed MoS_(2)/Ni electrodes with excellent electro-catalytic performance and long-term stability for dechlorination of florfenicol

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Journal of Environmental Sciences 2024年第3期137卷 420-431页

作者： Jianhui Xu Pengxu Wang Shenggui Chen Lei Li Dan Li yunfei zhang Qi Wu Jinhong Fan LumingMa School of Environment and Civil Engineering Dongguan University of TechnologyDongguan 523808China School of Art and Design Guangzhou Panyu PolytechnicGuangzhou 511483China National Engineering Research Center for Urban Pollution Control State Key Laboratory of Pollution Control and Resources ReuseCollege of Environmental Science and EngineeringTongji UniversityShanghai 200092China Dongguan Institute of Science and Technology Innovation Dongguan University of TechnologyDongguan 523808China School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China

Here,we report the production of 3D-printed MoS_(2)/Ni electrodes(3D-MoS_(2)/Ni)with longterm stability and excellent performance by the selective laser melting(SLM)*** a cathode,the obtained 3D-MoS_(2)/Ni could maintain a degradation rate above 94.0%for forfenicol(FLO)when repeatedly used 50 times in *** also found that the removal rate of FLO by 3D-MoS_(2)/Ni was about 12 times higher than that of 3D-printed pure Ni(3D-Ni),attributed to the improved accessibility of H^(*).In addition,the electrochemical characterization results showed that the electrochemically active surface area of the 3D-MoS_(2)/Ni electrode is about 3-fold higher than that of the 3D-Ni electrode while the electrical resistance is 4 times *** on tert-butanol suppression,electron paramagnetic resonance and triple quadrupole mass spectrometer experiments,a“dual path”mechanism and possible degradation pathway for the dechlorination of FLO by 3D-MoS_(2)/Ni were ***,we also investigated the impacts of the cathode potential and the initial pH of the solution on the degradation of ***,this study reveals that the SLM 3D printing technique is a promising approach for the rapid fabrication of high-stability metal electrodes,which could have broad application in the control of water contaminants in the environmental field.

关键词： 3D-print Electroreduction MoS_(2)/Ni Antibiotic Florfenicol

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Model experiment on anti-deformation performance of a self-supporting transmission tower in a subsidence area

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International Journal of Mining Science and Technology 2012年第1期22卷 57-61页

作者： Yuan Guanglin Shu Qianjin zhang yunfei Liu Tao Ji Yongsheng Xu Guoan Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering Xuzhou 221008China School of Mechanics&Civil Engineering China University of Mining&TechnologyXuzhou 221008China CXuzhou Power Supply Company Xuzhou 221006China Shandong Xinxing Architecture Planning&Design Institute Weifang 261200China

A large number of high-voltage power transmission towers have recently been constructed in mining areas prone to subsidence. In order to ensure the safety of the transmission towers and the safe operation of transmission systems, it is imperative to carry out research on the anti-deformation performance of transmission towers. In our study, we performed experiments on the anti-deformation performance of a transmission tower in a subsidence area on a scale model with a geometric scale ratio of 1:5 and analyzed the failure mechanism of the tower members. The results show that, when the axial distance between two supports changes, destabilization failure most likely occurs in the members of the bottom transverse layer because some parts of the main diagonal member bars yield under the action of compression. The failure mechanism of the tower members basically coincides with the lever principle.

关键词： Subsidence area Transmission tower Anti-deformation performance Similar model Experiment

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Flexible healable electromagnetic-interference-shielding bioelastichydrogel nanocomposite for machine learning-assisted highlysensitive sensing bioelectrode

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Aggregate 2024年第5期5卷 220-232页

作者： yunfei zhang Zehui Li Zhishan Xu Mingyue Xiao Yue Yuan Xiaolong Jia Rui Shi Liqun zhang Pengbo Wan College of Materials Science and Engineering State Key Laboratory of Organic-Inorganic CompositesBeijing University of Chemical TechnologyBeijingChina National Center for Orthopaedics Beijing Research Institute of Traumatology and OrthopaedicsBeijing Jishuitan HospitalBeijingChina

The prosperous evolution of conductive hydrogel-based skin sensors is attract-ing tremendous attention ***,it remains a great challenge to simultaneously integrate excellent mechanical strength,desirable electrical conduc-tivity,admirable sensing performance,and brilliant healability in hydrogel-based skin sensors for high-performance diagnostic healthcare sensing and wearable human-machine interface,as well as robust photothermal performance for promptly intelligent photothermal therapy followed by the medical diagnosis and superior electromagnetic interference(EMI)shielding performance for personal ***,aﬂexible healable MXene hydrogel-based skin sensor is prepared through a delicate combination of MXene(Ti_(3)C_(2)T_(x))nanosheets network with the polymeric *** as-prepared skin sensor is featured with signiﬁcantly enhanced mechanical,conducting,and sensing performances,along with robust self-healability,good biocompatibility,and reliable injectability,enabling ultrasensitive human motion monitoring and teeny electrophysiological signals *** a fron-tier technology in artiﬁcial intelligence,machine learning can facilitate to efﬁciently and precisely identify the electromyography signals produced by various human motions(such as variableﬁnger gestures)with up to 99.5%accuracy,afﬁrming the reliability of the machine learning-assisted gesture identiﬁcation with great poten-tial in smart personalized healthcare and human-machine ***,the MXene hydrogel-based skin sensor displays prominent EMI shielding performance,demonstrating the great promise of effective personal protection.

关键词： electromagnetic interference shielding healable hydrogel nanocomposite machine learning ultrasensi-tive human-interactive sensing

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Goal Self-Concordance Model: What HaveWe Learned and Where are We Going

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International Journal of Mental Health Promotion 2021年第2期23卷 201-219页

作者： Peng Wan Ting Wen yunfei zhang Hong Gao Jigan Wang Business School Hohai UniversityNanjing210098China School of Business Administration Nanjing University of Finance and EconomicsNanjing210023China College of Computer and Information Hohai UniversityNanjing210098China

Goal self-concordance reflects self-generated personal goals aligning with people’s interests and core values in one’s implicit personality as organic components,which is measured by the“perceived locus of causality”*** and achieving self-concordant goals both predict diversified outcomes in need-satisfaction,mental and physical well-being,positive attitude and behavior,*** on expounding and sorting out the concept and measurement about goal self-concordance,the author analyzes the differences among a series of goal self-concor-dance *** paper focuses on the latest research trends and summarizesfive influencing aspects of goal self-concordance:mental health,cognition,emotion,personal will,and behavioral *** mediating effects are discussed concerning antecedents and influence effects,the influence effects are shown in three aspects including the characteristics of individual,target,and *** the antecedent effects are respectively reflected in self-insight,personality,empowerment,and self-supported environment,content,and context of the goal ***,the author proposes several potential research interests from a broader perspective based on the current literature.

关键词： Goal self-concordance concept measurement antecedents and consequences(research status) future research prospects

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