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The effect of diphenylamine on the electronic,optical,and charge transport properties of BTD-based derivative:Insights from theory

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Chinese Chemical Letters 2011年第11期22卷 1383-1386页

作者： Bo hu Chan Yao Qing Wei Wang xu Ri huang Faculty of Chemistry Jilin Normal University Siping 136000 China Key Laboratory of Preparation and Applications of Environmental Friendly Materials Jilin Normal University Ministry of Education Siping 136000 China State Key Laboratory of Theoretical and Computational Chemistry Jilin University Changchun 130023 China

Theoretical investigations have been performed to explore the variation in electronic,optical,and charge transport properties upon the change of the chemical composition along the backbone in 2,1,3-benzothiadiazole（BTD）-based *** difference between hole and electron transportations with the charge hopping model indicates studied BTD-based derivative can be used as good ambipolar transport material in organic light-emitting diodes.

关键词： Diphenylamine 2 1 3-Benzothiadiazole Electronic and optical properties Reorganization energy

Double-Teeth-Shaped Plasmonic Waveguide Electro-Optical Switches

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Chinese Physics Letters 2011年第8期28卷 326-329页

作者： Zhu Jia-hu huang xu-Guang MEI Xian Key laboratory of Photonic Information Technology of Guangdong Higher Education Institutes South China Normal UniversityGuangzhou 510006

An electro-optical switch based on a plasmonic T-shaped waveguide structure with a double-teeth-shaped waveguide filled with 4-dimethylamino-N-methyl-4-stilbazolium tosylate is proposed and numerically *** Finite-difference time domain simulation results reveal that the structure can operate as a circuit switch by controlling the external voltages V1 and/or V_(2).The proposed structure can also operate as a variable optical attenuator,which can continuously attenuate the power of a light beam from 6 dB to 30 dB by an external electrical *** structure is of small size of a few hundred *** results may open a possibility to construct nanoscale high-density photonic integration circuits.

关键词： waveguide Waveguide structure

High-Resolution Plasmonic Refractive-Index Sensor Based on a Metal-Insulator-Metal Structure

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Chinese Physics Letters 2011年第5期28卷 120-123页

作者： Zhu Jia-hu huang xu-Guang MEI Xian Key Laboratory of Photonic Information Technology of Guangdong Higher Education Institutes South China Normal UniversityGuangzhou 510006

A high-resolution plasmonic refractive-index sensor based on a metal-insulator-metal structure consisting of a straight bus waveguide and a resonator waveguide is proposed and numerically simulated by using the finite difference time domain method under a perfectly matched layer absorbing boundary *** analytic and simulated results show that the resonant wavelengths of the sensor have a linear relationship with the refractive index of material under *** on the relationship,the refractive index of the material can be obtained from the detection of one of the resonant *** resolution of refractive index of the nanometeric plasmonic sensor can reach as high as 10-6,giving the wavelength resolution of 0.01 *** could be applied to highly-resolution biological sensing.

关键词： waveguide resonator refractive

Assessment of different genetic distances in constructing cotton core subset by genotypic values

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第5期9卷 356-362页

作者： Jian-cheng WANG Jin hu Xin-xian huang Sheng-chun xu Seed Science Center College of Agriculture and Biotechnology Zhejiang University Hangzhou 310029 China Crop Research Institute Shandong Academy of Agricultural Sciences Jinan 250100 China

One hundred and sixty-eight genotypes of cotton from the same growing region were used as a germplasm group to study the validity of different genetic distances in constructing cotton core subset. Mixed linear model approach was employed to unbiasedly predict genotypic values of 20 traits for eliminating the environmental effect. Six commonly used genetic distances(Euclidean,standardized Euclidean,Mahalanobis,city block,cosine and correlation distances) combining four commonly used hierarchical cluster methods(single distance,complete distance,unweighted pair-group average and Ward's methods) were used in the least distance stepwise sampling(LDSS) method for constructing different core subsets. The analyses of variance(ANOVA) of different evaluating parameters showed that the validities of cosine and correlation distances were inferior to those of Euclidean,standardized Euclidean,Mahalanobis and city block distances. Standardized Euclidean distance was slightly more effective than Euclidean,Mahalanobis and city block distances. The principal analysis validated standardized Euclidean distance in the course of constructing practical core subsets. The covariance matrix of accessions might be ill-conditioned when Mahalanobis distance was used to calculate genetic distance at low sampling percentages,which led to bias in small-sized core subset construction. The standardized Euclidean distance is recommended in core subset construction with LDSS method.

关键词： Core subset Mixed linear model Least distance stepwise sampling (LDSS) method Standardized Euclidean distance Mahalanobis distance

Bispectrum Feature Extraction of Gearbox Faults Based on Nonnegative Tucker3 Decomposition with 3D Calculations

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Chinese Journal of Mechanical Engineering 2013年第6期26卷 1182-1193页

作者： WANG Haijun xu Feiyun ZHAO Jun’ai JIA Minping hu Jianzhong huang Peng School of Mechanical Engineering Southeast University

Nonnegative Tucker3 decomposition（NTD） has attracted lots of attentions for its good performance in 3D data array analysis. However, further research is still necessary to solve the problems of overfitting and slow convergence under the anharmonic vibration circumstance occurred in the field of mechanical fault diagnosis. To decompose a large-scale tensor and extract available bispectrum feature, a method of conjugating Choi-Williams kernel function with Gauss-Newton Cartesian product based on nonnegative Tucker3 decomposition（NTD_EDF） is investigated. The complexity of the proposed method is reduced from o（nNlgn） in 3D spaces to o（RiR2nlgn） in 1D vectors due to its low rank form of the Tucker-product convolution. Meanwhile, a simultaneously updating algorithm is given to overcome the overfitting, slow convergence and low efficiency existing in the conventional one-by-one updating algorithm. Furthermore, the technique of spectral phase analysis for quadratic coupling estimation is used to explain the feature spectrum extracted from the gearbox fault data by the proposed method in detail. The simulated and experimental results show that the sparser and more inerratic feature distribution of basis images can be obtained with core tensor by the NTD EDF method compared with the one by the other methods in bispectrum feature extraction, and a legible fault expression can also be performed by power spectral density（PSD） function. Besides, the deviations of successive relative error（DSRE） of NTD_EDF achieves 81.66 dB against 15.17 dB by beta-divergences based on NTD（NTD_Beta） and the time-cost of NTD EDF is only 129.3 s, which is far less than 1 747.9 s by hierarchical alternative least square based on NTD （NTD_HALS）. The NTD_EDF method proposed not only avoids the data overfitting and improves the computation efficiency but also can be used to extract more inerratic and sparser bispectrum features of the gearbox fault.

关键词： nonnegative tucker3 decomposition Tucker-product convolution power spectrum density updating algorithm

The Pael-R gene does not mediate the changes in rotenone-induced Parkinson's disease model cells

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Neural Regeneration Research 2014年第4期9卷 402-406页

作者： Ting Zou Xiangqi Tang Zhiling huang Niangui xu Zhiping hu Department of Neurology Second Xiangya HospitalCentral South University

In this study, we established cell models for Parkinson＇s disease using rotenone. An RNA interfer- ence vector targeting Parkin-associated endothelin receptor-like receptor （Pad-R） was transfected into the model cells. The results of reverse-transcription polymerase chain reaction and western blot analysis showed that Pael-R expression was decreased after RNA interference compared with the control group （no treatment） and the model group （rotenone treatment）, while the rate of apoptosis and survival of dopaminergic cells did not differ significantly between groups, as detected by flow cytometry and an MTT assay. These experimental findings indicate that the Pael-R gene has no role in the changes in rotenone-induced Parkinson＇s disease model cells.

关键词： nerve regeneration neurodegeneration Parkinson's disease rotenone Pael-R RNA interference apoptosis mitochondria neural regeneration

Direct Triflylation of Benzylic C-H Bonds with Pyridine as a Directing Group

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Chinese Journal of Chemistry 2017年第6期35卷 867-870页

作者： Jun Yang Juanjuan hu Yangen huang Xiuhua xu Fengling Qing College of Chemistry Chemical Engineering and Biotechnolog.y Donghua University Shanghai 201620 China Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic Chemistry Shanghai 200032 China

The first example of benzylic C-H triflylation was accomplished with pyridine as a directing group. The reac- tion of various 2-benzylpyridines and （CF3SO2）20 in the presence of NEt3 in CH2Cl2 proceeded smoothly to ... 详细信息

关键词： triflylation C-H functionalization benzyl triflone pyridine

Source identification and prediction of nitrogen and phosphorus pollution of Lake Taihu by an ensemble machine learning technique

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Frontiers of Environmental Science & Engineering 2023年第5期17卷 27-40页

作者： Yirong hu Wenjie Du Cheng Yang Yang Wang Tianyin huang Xiaoyi xu Wenwei Li CAS Key Laboratory of Urban Pollutant Conversion Department of Environmental Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China School of Software Engineering University of Science and Technology of ChinaHefei 230026China USTC-CityU Joint Advanced Research Center Suzhou Institute for Advanced Research of USTCSuzhou 215123China National and Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology Suzhou University of Science and TechnologySuzhou 215009China

Effective control of lake eutrophication necessitates a full understanding of the complicated nitrogen and phosphorus pollution sources,for which mathematical modeling is commonly *** contrast to the conventional knowledge-based models that usually perform poorly due to insufficient knowledge of pollutant geochemical cycling,we employed an ensemble machine learning(ML)model to identify the key nitrogen and phosphorus sources of *** ML models were developed based on 13 years of historical data of Lake Taihu’s water quality,environmental input,and meteorological conditions,among which the XGBoost model stood out as the best model for total nitrogen(TN)and total phosphorus(TP)*** results suggest that the lake TN is mainly affected by the endogenous load and inflow river water quality,while the lake TP is predominantly from endogenous *** prediction of the lake TN and TP concentration changes in response to these key feature variations suggests that endogenous source control is a highly desirable option for lake eutrophication ***,one-month-ahead prediction of lake TN and TP concentrations(R2 of 0.85 and 0.95,respectively)was achieved based on this model with sliding time window lengths of 9 and 6 months,*** work demonstrates the great potential of using ensemble ML models for lake pollution source tracking and prediction,which may provide valuable references for early warning and rational control of lake eutrophication.

关键词： Eutrophication Machine learning Water quality Nutrients Prediction

Fabricating PdCe/OMS-2 catalysts with boosted low-temperature activity for toluene deep degradation

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Journal of Rare Earths 2023年第6期41卷 839-849,I0002页

作者： Lin Yue Zhihua xu Minghua hu Mingjiao Tian Mudi Ma Bijie huang Chi He State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China State Key Laboratory of Precision Blasting and hubei Key Laboratory of Industrial Fume and Dust Pollution Control Jianghan UniversityWuhan 430056China National Engineering Laboratory for VOCs Pollution Control Material&Technology University of Chinese Academy of SciencesBeijing 101408China

Porous cryptomelane-type octahedral molecular sieve(OMS-2)with mixed Mn valence and abundant lattice oxygen species has attracted much attention in volatile organic compounds(VOC)catalytic ***,complete conversion of arene over OMS-2 catalysts at relatively low temperature is still a challenge due to its limited crystal structure and inferior ***,a series of PdCe/OMS-2 catalysts with different Pd/Ce molar ratios was fabricated by a facile impregnation method and the physicochemical properties of which were extensively characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),high-resolution transmission electron microscopy(HR-TEM),B runauer-Emmett-Teller(BET)method,X-ray fluorescence(XRF),X-ray photoelectron spectroscopy(XPS),temperature programmed reduction of H2(H2-TPR),Raman,In situ diffused reflectance infrared Fourier transform spectra(DRIFTS),and density functional theory(DFT)*** show that the total conversion of toluene can be achieved at 207℃ over PdCe2 with apparent activation energy as low as 62.6 kJ/*** strong synergistic effect between Pd and Ce remarkably boosts the catalytic activity of OMS-2,attributed to the abundant Mn^(3+)-O bands and active surface oxygen *** results reveal that oxygen vacancy can be formed over PdCe2 much easily than that of Pd/OMS-2 and Ce/OMS-2 with the oxygen vacancy formation energy of2.42,2.83 and 2.68 eV,*** increasing the Pd content cannot promote the catalytic activity although PdO is a critical active center in toluene *** vacancy attributed to the integrative effect of Pd,Ce and Mn species plays a promine nt role over prepared catalysts in toluene activation *** findings reported in this work showed new insights into the designing of highly efficient OMS-2catalysts for VOC deep oxidation by tuning oxygen vacancy concentration.

关键词： PdCe/OMS-2 Toluene Catalytic oxidation Oxygen vacancy Rare earths