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Free Rotor Model or Rigid Rotor Model for CH3F-Ne Complex and Comparison with Other CH3F-Rare Gas Systems

Chemical Research in Chinese Universities 2016年第5期32卷 818-826页

作者： MA yongtao ZHAO Yuanyuan HOU Dan LI Hui Institute of Theoretical Chemistry Jilin University Changchun 130021 P. R. China

The assignment of the rovibrational spectra of molecule-Ne complexes is always a challenge to study van der Waals systems, since they usually exhibit behavior intermediate between free rotor and rigid rotor. In this paper, the microwave and infrared spectra of CH3F-Ne, a model system for symmetric-top-atom dimer, were firstly pre- dicted and analyzed based on the four-dimensional ab initio intermolecular potential energy surfaces（PESs）, which explicitly incorporate the v3（C--F） stretch normal model coordinate of the CH3F monomer. Analytic three-dimensional PESs were obtained by least-squares fitting vibrationally averaged interaction energies for v3（CH3F）=0 and 1 to the Morse/long-range（MLR） potential function for symmetry top impurity with atom model. These PESs fitting to 2340 points have root-mean-square（RMS） deviations of 0.07 cm1, and require only 167 parameters. Based on the analytical vibrationally averaged PESs, the rovibrational energy levels were calculated by employing Lanczos algorithm, with combined radial discrete variable representation and parity-adapted angular finite basis representation. Based on the wavefunction analysis and comparison of CH3F-Ne with CH3F-He and CH3F-Ar complexes, the bound states were assigned. Spectral parameters for CH3F-Rg（Rg： rare gas, Rg=He, Ne, Ar） complexes were fitted and discussed. Temperature dependent transition intensities for CH3F-Ne were also reported and analyzed. The complete microwave and infrared spectra information for CH3F-Ne made it possible to provide important guidance for future experimental spectroscopic assignments.

关键词： Morse/long-range model Rovibrational spectrum Symmetry-top molecule CH3F-Ne

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Recent advances in MXene for terahertz applications

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Optoelectronics Letters 2024年第5期20卷 272-288页

作者： ZHANG Yongzhi JIANG Jiuxing YAO yongtao HE Xunjun Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China College of Science Harbin University of Science and TechnologyHarbin 150080China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin University of Science and TechnologyHarbin 150080China

Since first synthesized in 2011, MXenes have attracted extensive attention in many scientific fields as a new two-dimensional(2D) material because of the unique physical and chemical properties. Over the past decade, in particular, MXenes have obtained numerous exciting achievements in the field of terahertz applications. In this review, we first briefly introduce the MXene materials, such as the basic structure and main fabrication processes of MXenes. Then, we summarize the recent applications of MXene materials in various terahertz research areas, including terahertz modulation, terahertz absorption, terahertz shielding, terahertz communication, terahertz detection and terahertz generation, in which the representative results are presented. Finally, we give an outlook on the future research directions of MXene materials and their potential applications.

关键词： terahertz directions absorption

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Tetradic double-network physical crosslinking hydrogels with synergistic high stretchable, self-healing, adhesive, and strain-sensitive properties

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Journal of Materials Science & Technology 2022年第3期98卷 169-176页

作者： Huihui Bai Zhixing Zhang Yajie Huo yongtao Shen Mengmeng Qin Wei Feng School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin 300072China Tianjin Key Laboratory of Composite and Functional Materials Tianjin 300072China

Herein,we demonstrate a tetradic double-network physical cross-linking hydrogel comprising of gelatin,polyacrylic acid,tannic acid,and aluminum chloride as wearable hydrogel *** on the coordination bonds,hydrogen bonds,and chain entanglements of the two networks,the acquired hydrogel possesses excellent tensile properties,self-healing performance,and adhesiveness to many *** properties can be tuned with fracture strain ranging from 900 to 2200%and tensile strength ranging from 24 to 216 kPa,***,the hydrogel also exhibits good strain-sensitivity when monitoring the motions of humans,such as bending of fingers,bending of ***,we can believe that the GATA hydrogel has numerous applications in soft robots,intelligent wearable devices,and human health supervision.

关键词： Double-network hydrogel High stretchable Adhesive Self-healing Strain sensor

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A Parameterization Scheme for Wind Wave Modules that Includes the Sea Ice Thickness in the Marginal Ice Zone

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Advances in Atmospheric Sciences 2023年第12期40卷 2279-2287页

作者： Dongang LIU Qinghua YANG Andrei TSARAU yongtao HUANG Xuewei LI Navigation College Dalian Maritime UniversityDalian 116026China School of Atmospheric Sciences Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China SINTEF Ocean Brattørkaia 17C7010 TrondheimNorway Norwegian University of Science and Technology 7491 TrondheimNorway

The global wave model WAVEWATCH III®works well in open *** simulate the propagation and attenuation of waves through ice-covered water,existing simulations have considered the influence of sea ice by adding the sea ice concentration in the wind wave module;however,they simply suppose that the wind cannot penetrate the ice layer and ignore the possibility of wind forcing waves below the ice *** improve the simulation performance of wind wave modules in the marginal ice zone(MIZ),this study proposes a parameterization scheme by directly including the sea ice *** of scaling the wind input with the fraction of open water,this new scheme allows partial wind input in ice-covered areas based on the ice *** with observations in the Barents Sea in 2016,the new scheme appears to improve the modeled waves in the high-frequency *** experiments with and without wind wave modules show that wind waves can play an important role in areas with low sea ice concentration in the MIZ.

关键词： wind wave IMU wave PSD wave attenuation Barents Sea

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Determination of selected semi-volatile organic compounds in water using automated online solid-phase extraction with large-volume injection/gas chromatography/mass spectrometry

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Frontiers of Environmental Science & Engineering 2011年第3期5卷 417-425页

作者： yongtao LI Christina L.MCCARTY Ed J.GEORGE Drinking Water Quality Laboratory Underwriters Laboratories Inc.South BendIN 46617USA Chemical Analysis Bruker DaltonicsFremontCA 94538USA

A rapid,sensitive,and cost-effective analyticalmethod was developed for the analysis of selected semivolatileorganic compounds in *** method used anautomated online solid-phase extraction technique coupledwith programmed-temperature vaporization large-volumeinjection gas chromatography/mass *** samples were extracted by using a fully automatedmobile rack system based on x-y-z robotic techniquesusing syringes and disposable 96-well extraction *** method was validated for the analysis of 30 semivolatileanalytes in drinking water,groundwater,andsurface *** a sample volume of 10 mL,the linearcalibrations ranged from 0.01 or 0.05 to 2.5μg·L^(-1),and themethod detection limits were less than 0.1μg·L^(-1).For thereagent water samples fortified at 1.0μg·L^(-1)and2.0μg·L^(-1),the obtained mean absolute recoveries were70%-130%with relative standard deviations of less than20%for most *** the drinking water,groundwater,and surface water samples fortified at 1.0μg·L^(-1),theobtained mean absolute recoveries were 50%-130%withrelative standard deviations of less than 20%for *** new method demonstrated three advantages:1)no manipulation except the fortification of surrogatestandards prior to extraction;2)significant cost reductionassociated with sample collection,shipping,storage,andpreparation;and 3)reduced exposure to hazardous solventsand other *** a result,this new automatedmethod can be used as an effective approach for screeningand/or compliance monitoring of selected semi-volatileorganic compounds in water.

关键词： automated solid-phase extraction programmed-temperature vaporization large-volume injection gas chromatography/mass spectrometry semi-volatile organic compounds water analysis

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Fabrication and Corrosion Resistance of SiC-coated Multi-walled Carbon Nanotubes

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Journal of Materials Science & Technology 2013年第12期29卷 1146-1150页

作者： Ning Song Hong Liu yongtao Yuan Xing Li Jingzhong Fang Optical and Electronic Institute Chinese Academy of Sciences

Multi-walled carbon nanotubes （MWNTs） were coated with nanometer sized SiC layer by magnetron sputtering, and their corrosion resistances in oxygen and gaseous silicon were studied, respectively. X-ray diffraction （XRD） reveals that the as-coated MWNTs are comprised of the amorphous SiC and the phase could transfer from amorphous to polycrystalline SiC by annealing at 1360 °C. Scanning electron microscopy （SEM） observation indicates that SiC nanoparticles are uniformly coated on the MWNTs, forming a continuous SiC coating. Thermogravimetric analysis （TGA） confirms that the onset temperature of oxidation increases from 540 to 700 ~C with the SiC coating. The morphologies of non-coated and SiC-coated MWNTs after corrosion by oxygen and gaseous silicon were also characterized by SEM. The results revealed that SiC coating could protect MWNTs from the corrosion with qaseous silicon effectivelv.

关键词： Silicon carbide Coating Multi-walled carbon nanotubes Corrosion resistance

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A Novel Method for Aging Prediction of Railway Catenary Based on Improved Kalman Filter

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Structural Durability & Health Monitoring 2024年第1期18卷 73-90页

作者： Jie Li Rongwen Wang yongtao Hu Jinjun Li School of Electrical Engineering and Automation Henan Institute of TechnologyXinxiang453003China Technology Center Sichuan Injet Electric Co.Ltd.Deyang618000China Embedded System Research Institute Xinxiang Engineering Research Center for Intelligent Condition Monitoring of MachineryXinxiang453003China

The aging prediction of railway catenary is of profound significance for ensuring the regular operation of electrified ***,in real-world scenarios,accurate predictions are challenging due to various *** paper addresses this challenge by proposing a novel method for predicting the aging of railway catenary based on an improved Kalman filter(KF).The proposed method focuses on modifying the priori state estimate covariance and measurement error covariance of the KF to enhance accuracy in complex *** comparing the optimal displacement value with the theoretically calculated value based on the thermal expansion effect of metals,it becomes possible to ascertain the aging status of the *** improve prediction accuracy,a railway catenary aging prediction model is constructed by integrating the Takagi-Sugeno(T-S)fuzzy neural network(FNN)and *** this model,an adaptive training method is introduced,allowing the FNN to use fewer fuzzy *** inputs of the model include time,temperature,and historical displacement,while the output is the predicted ***,the KF is enhanced by modifying its prior state estimate covariance and measurement error *** modifications contribute to more accurate ***,a low-power experimental platform based on FPGA is implemented to verify the effectiveness of the proposed *** test results demonstrate that the proposed method outperforms the compared method,showcasing its superior performance.

关键词： Railway catenary Takagi-Sugeno fuzzy neural network Kalman filter aging prediction

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Dynamic web service composition based on OWL-S

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Science in China(Series F) 2006年第6期49卷 843-863页

作者： Jing DONG yongtao SUN Sheng YANG Kang ZHANG Department of Computer Science University of Texas at Dallas Richardson TX 75083 USA American Airlines 4333 Amon Carter Blvd Fort Worth TX 76155 USA

Composing existing web services for enterprise applications may enable higher level of reuse. However the composition processes are mostly static and lack of support for runtime redesign. In this paper, we describe our approach to the extension of the OWL-S ontology framework for dynamic web service composition. We raise the level of abstraction and propose an abstract service layer so that web services can be composed at the abstract service level instead of the concrete level. Each abstract service is attached with an instance pool including all instances of the abstract service to facilitate fail-over and dynamic compositions.

关键词： web service instance pool abstract service ontology dynamic composition

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A New Method of Wind Turbine Bearing Fault Diagnosis Based on Multi-Masking Empirical Mode Decomposition and Fuzzy C-Means Clustering

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Chinese Journal of Mechanical Engineering 2019年第3期32卷 156-167页

作者： yongtao Hu Shuqing Zhang Anqi Jiang Liguo Zhang Wanlu Jiang Junfeng Li Institute of Electric Engineering Yanshan UniversityQinhuangdao 066004China School of Electrical Engineering and Automation Henan Institute of TechnologyXinxiang 453003China

Based on Multi-Masking Empirical Mode Decomposition (MMEMD) and fuzzy c-means (FCM) clustering, a new method of wind turbine bearing fault diagnosis FCM-MMEMD is proposed, which can determine the fault accurately and timely. First, FCM clustering is employed to classify the data into different clusters, which helps to estimate whether there is a fault and how many fault types there are. If fault signals exist, the fault vibration signals are then demodulated and decomposed into different frequency bands by MMEMD in order to be analyzed further. In order to overcome the mode mixing defect of empirical mode decomposition (EMD), a novel method called MMEMD is proposed. It is an improvement to masking empirical mode decomposition (MEMD). By adding multi-masking signals to the signals to be decomposed in different levels, it can restrain low-frequency components from mixing in highfrequency components effectively in the sifting process and then suppress the mode mixing. It has the advantages of easy implementation and strong ability of suppressing modal mixing. The fault type is determined by Hilbert envelope finally. The results of simulation signal decomposition showed the high performance of MMEMD. Experiments of bearing fault diagnosis in wind turbine bearing fault diagnosis proved the validity and high accuracy of the new method.

关键词： Wind turbine bearing faults diagnosis Multi-masking empirical mode decomposition (MMEMD) Fuzzy c-mean (FCM) clustering

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An eco-friendly and highly sensitive loofah@CF/CNT 3D piezoresistive sensor for human activity monitoring and mechanical cotrol

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Science China(Technological Sciences) 2022年第11期65卷 2667-2674页

作者： ZHU Jie SONG yongtao XUE XiaoFei LIU ZhiLong MAO QingYuan JIA ZhenHua School of Computer Science and Engineering North China Institute of Aerospace EngineeringLangfang 065000China

Three-dimensional(3D)porous piezoresistive sensors are widely used because of their simple fabrication and convenient signal ***,because of the dependence on organic skeleton materials and the complexity of conductive coating preparation,the electrical and mechanical properties of 3D wearable piezoresistive sensors have gradually failed to accommodate many emerging ***,a new flexible 3D piezoresistive sensor(NF3PS)with high sensitivity and a wide measurement range is proposed,which comprises a natural porous loofah as a flexible framework and carbon fiber/carbon nanotube(CF/CNT)multiscale composite as a conductive *** of cellulose and lignin,the irregular,porous loofah has excellent mechanical strength,elasticity,and toughness,ensuring a repeated compression/recovery behavior of the *** addition,compared with the single-size carbon coating,the coupling of multiscale CF/CNT composite coating improves sensitivities over a range of *** NF3PS demonstrates a sensitivity of 6.94 kPa^(-1) with good linearity in the pressure range of 0–11.2 kPa and maintains a sensitivity of 0.28 kPa^(-1) in an ultrawide measurement range of 11.2–84.6 *** flexibility,robustness,and wide-ranging linear resistance variation,the feasibility of the NF3PS in human activity monitoring,mechanical control,and smart homes is *** work provides a novel strategy for a new generation of 3D flexible pressure sensors for improving sensitivity and measurement range and demonstrates attractive applications in wearable sensors.

关键词： 3D piezoresistive sensor loofah framework CF/CNT multiscale composite high sensitivity human activity monitoring mechanical control

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