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Conjugated dendritic oligothiophenes for solution-processed bulk heterojunction solar cells

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Frontiers of Optoelectronics 2011年第1期4卷 12-23页

作者： Chang-qi ma Institute of Organic Chemistry II and Advanced materials Ulm University

This mini-review summarizes the recent achievements of developing conjugated dendritic oligothiophenes(DOT) for use in solution-processed bulk heterojunction(BHJ) solar cells. These DOTs are structurally defined molecules with relatively high molecular weight. Therefore, this novel class of thiophene based material possesses not only some advantages of oligomers,such as defined and monodispersed molecular structure,high chemical purity, but also some characteristics of polymers, for example, good *** addition, the step-by-step approach of its synthesis allows precise functionalization of dendritic backbones with desired moieties, which is helpful to finely tune the optical and electronic properties of materials. Power conversion efficiencies(PCE) of BHJ solar cells were achieved up to 2.5% when functionalized thiophene dendrimers were used as electron donor and electron acceptor was a fullerene derivative. These results indicated that dendritic oligothiophenes are a novel class of the materials of electron donor for solution-processed organic solar cells.

关键词： conjugated dendrimers dendritic oligothiophenes (DOT) organic semiconductors bulk heterojunction (BHJ) solar cells

Spin-1/2 Fermion Gas in One-Dimensional Harmonic Trap with Attractive Delta Function Interaction

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Chinese Physics Letters 2017年第2期34卷 11-14页

作者： Ya-Hui Wang Zhong-qi ma School of Physics and Telecommunication Engineering Shaanxi Sci-Tech University Hanzhong 723000 Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049

In terms of the Thomas Fermi method, we solve the ground state energy of the iv-body 1D harmonically trapped spin-l/2 fermion gas with the attractive ^-function interaction in the limit N→∞.

关键词： ELECTRON spin FERMIONS GROUND state energy MOLECULAR interactions LIMITS (mathematics)

Ground State Energy of 1D Attractive δ-Function Interacting Fermi Gas

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Chinese Physics Letters 2012年第8期29卷 45-47页

作者： WANG Ya-Hui ma Zhong-qi Department of Physics Shaanxi University of TechnologyHanzhong 723000 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049

The ground state energy of one-dimensional two-component Fermi gas with the attractive δ-function interaction is fitted with a simple approximate function.

关键词： function Fermi fitted

Distributions of dimethylsulfide in the Bohai Sea and Yellow Sea of China

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Journal of Environmental Sciences 2003年第6期15卷 762-767页

作者： HU Min TANG Xiao-yan LI Jin-long ma qi-ju State Joint Key Laboratory of Environmental Simulation and Pollution Control Center for Environmental Sciences Peking UniversityBeijing 100871China.

Dimethylsulfide(DMS) measurements in the surface seawater of China eastern coastline were conducted during march 9—10, 1993 in Bohai Sea along the cruise from Dalian to Tianjin and during September 24—25, 1994 in Yellow Sea along the cruise from Shanghai to qingdao. On the cruise in Bohai Sea DMS concentrations varied from 0.11 to 2.63 nmol/L with an average of 1.31 nmol/L, while DMS flux was estimated to be 0.85 μmol/(m 2·d) with the range of 0.04—3.12 μmol/(m 2·d). On the cruise in Yellow Sea DMS concentrations varied from 0.95 to 7.48 nmol/L with an average of 2.89 nmol/L, and DMS flux was estimated to be 7.94 μmol/(m 2·d) with the range of 0.11—18.88 μmol/(m 2·d). Variations in DMS concentrations along the latitude in Yellow Sea were observed larger than those along the longitude in Bohai Sea. DMS concentrations and fluxes had a similar spatial trend both in Bohai Sea and Yellow Sea with the correlation coefficients of 0.75 and 0.64, respectively.

关键词： dimethylsulfide sea-to-air flux China Bohai Sea China Yellow Sea

A WD-GA-LSSVM model for rainfall-triggered landslide displacement prediction

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Journal of Mountain Science 2018年第1期15卷 156-166页

作者： ZHU Xing ma Shu-qi XU qiang LIU Wen-de State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology School of Civil and Environmental Engineering Nanyang Technological University

This paper proposes a WD-GA-LSSVM model for predicting the displacement of a deepseated landslide triggered by seasonal rainfall,in which wavelet denoising(WD)is used in displacement time series of landslide to eliminate the GPS observation noise in the original data,and genetic algorithm(GA)is applied to obtain optimal parameters of least squares support vector machines(LSSVM)*** model is first trained and then evaluated by using data from a gentle dipping(~2°-5°)landslide triggered by seasonal rainfall in the southwest of *** comparisons of WD-GA-LSSVM model with Back Propagation Neural Network(BPNN)model and LSSVM are presented,*** results indicate that the adoption of WD-GA-LSSVM model significantly improves the robustness and accuracy of the displacement prediction and it provides a powerful technique for predicting the displacement of a rainfall-triggered landslide.

关键词： WD-GA-LSSVM Landslide Rainfall Displacement prediction Wavelet denoising

Energy Levels of a Positronium Negative Ion

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Chinese Physics Letters 2001年第7期18卷 854-856页

作者： DUAN Bin GU Xiao-Yan ma Zhong-qi Institute of High Energy Physics Chinese Academy of SciencesP.O.Box 918(4)Beijing 100039

The energy levels of a positronium negative ion are calculateddirectly from the Schrödinger equation. After removing thetranslational and rotational degrees of freedom, only three internal variables are involved in both functions and *** singularity of the solution is eliminated by choosing the right internal variables, and the series in calculation converges very fast.

关键词： equation. equations. singularity

Vibrational Spectrum of Methane in an Algebraic Model

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Chinese Physics Letters 1998年第4期15卷 260-262页

作者： HOU Xi-wen DONG Shi-hai ma Zhong-qi Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039 Department of Physics University of Three GorgesYichang 443000

A U(2)algebraic model is used to explain the stretching and bending vibrational spectrum of methane,where the interactions between the stretching and the bending modes are taken into *** model provides good fits to the experimental vibrational eigenvalues with the smaller standard deviations of 9.57 and 9.08 cm^(-1) than those in other published algebraic models.

关键词： algebraic vibrational bending

Interfacial Properties Modification of Carbon Fiber/Polyarylacetylene Composites

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Chinese Journal of Aeronautics 2007年第2期20卷 124-128页

作者： FU Hong-jun ma Chong-qi KUANG Nai-hang LUAN Shi-lin School of Textile Tianjin Polytechnic University Tianjin 300160 China Harbin FRP Institute Harbin 150001 China

This work was dedicated to performing surface oxidation and coating treatments on carbon fibers （CF） and investigating the changes of fiber surface properties after these treatments, including surface composition, relative volume of functional groups, and surface topography with X-ray photoelectron spectroscopy （XPS） and atom force microscopy （AFM） technology. The results show that, after oxidation treatments, interfacial properties between CF and non-polar polyarylacetylene （PAA） resin are remarkably modified by removing weak surface layers and increasing fiber surface roughness. Coating treatment by high char phenolic resin solution after oxidation makes interface of CF/PAA composites to be upgraded and the interfacial properties further bettered.

关键词： composites carbon fiber polyarylacetylene interface

Characteristics of Scholte wave and film characterization in layered thin film overlying substrate structures

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Chinese Journal of Acoustics 2023年第3期42卷 349-363页

作者： SONG Bowen ma qi HU Wenxiang Institute of Acoustics Tongji UniversityShanghai 200092 Edan Instrument Shenzhen 518122

The layered film-substrate structure is widely used in many fields such as microelectronic devices,but the ultrasonic measurement of film material parameters,especially the characterization of shear wave velocity,is a difficult *** this paper,the dispersion characteristics of Scholte wave at the liquid-solid interface and the acoustic pressure response generated by a pulse excitation are theoretically *** results show that the Scholte wave dispersion at the liquid-solid interface is closely related to the velocity distribution of the layered film-substrate *** thickness and shear wave velocity of each layer of the thin film material have a significant effect on the interface wave dispersion *** on the dispersion properties of Scholte interface waves,a multi-parameter inversion characterization method for multilayer films is ***,the film parameter inversion is carried out for the theoretical signal,which verifies the feasibility of the *** experiments on the excitation and acquisition of liquid-solid interface waves are carried out on different types of multilayer film material samples,and the film parameter inversion results of the experimental signals further verify the feasibility and effectiveness of the method.

关键词： film wave characterization