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Two-photon Induced UV Fluorescence in Photo-active Spiropyran Molecules

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Chinese Journal of Lasers 1995年第2期B4卷 101-104页

作者： CHI Lunguang WANG Zugeng(Department of physics, East china normal university,Joint Laboratory for Quantum Optics, Shanghai institute of Optics &. Fine mechanics,Academia Sinica and East china normal university, Shanghai 200062, china) East china normal Univ Shanghai China

Ｔｗｏ－ｐｈｏｔｏｎＩｎｄｕｃｅｄＵＶＦｌｕｏｒｅｓｃｅｎｃｅｉｎＰｈｏｔｏ－ａｃｔｉｖｅＳｐｉｒｏｐｙｒａｎＭｏｌｅｃｕｌｅｓ￥ＣＨＩＬｕｎｇｕａｎｇ；ＷＡＮＧＺｕｇｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，... 详细信息

Ｔｗｏ－ｐｈｏｔｏｎＩｎｄｕｃｅｄＵＶＦｌｕｏｒｅｓｃｅｎｃｅｉｎＰｈｏｔｏ－ａｃｔｉｖｅＳｐｉｒｏｐｙｒａｎＭｏｌｅｃｕｌｅｓ￥ＣＨＩＬｕｎｇｕａｎｇ；ＷＡＮＧＺｕｇｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＥａｓｔＣｈｉｎａＮｏｒｍａｌＵｎ...

关键词： spiropyran merocyanine two-photon absorption UV fluorescence

A New Type of High Frequency Vibrational Modes for Diatomic Chain with Quartic Substrate nonlinearity

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原子与分子物理学报 1998年第3期 141-145页

作者： Department of physics and institute for nonlinear science, Hunan normal university, Changsha Hunan 410081Hu XiangyueDepartment of physics, Changsha Railway university, Changsha Hunan 410075 li LequnShaoyang College of education,Shaoyang

ＡＮｅｗＴｙｐｅｏｆＨｉｇｈＦｒｅｑｕｅｎｃｙＶｉｂｒａｔｉｏｎａｌＭｏｄｅｓｆｏｒＤｉａｔｏｍｉｃＣｈａｉｎｗｉｔｈＱｕａｒｔｉｃＳｕｂｓｔｒａｔｅＮｏｎｌｉｎｅａｒｉｔｙＺｈｏｕＧｕａｎｇｈｕｉＤｅｐａｒｔｍｅ... 详细信息

ＡＮｅｗＴｙｐｅｏｆＨｉｇｈＦｒｅｑｕｅｎｃｙＶｉｂｒａｔｉｏｎａｌＭｏｄｅｓｆｏｒＤｉａｔｏｍｉｃＣｈａｉｎｗｉｔｈＱｕａｒｔｉｃＳｕｂｓｔｒａｔｅＮｏｎｌｉｎｅａｒｉｔｙＺｈｏｕＧｕａｎｇｈｕｉＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓａｎｄＩｎｓ...

关键词： Diatomic chain Phase plane analysis nonlinear vibrational modes

Fabrication of hexagonal gallium nitride films on silicon (111) substrates

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Rare Metals 2003年第3期22卷 221-225页

作者： YANGli XUEChengshan WANGCuimei lihuaixiang RENYuwen ChemistryFunctionMaterialsLab InstituteofSemiconductorsShandongNormalUniversityJinan250014China physicsDe0artment ShandongNormalUniversityJinan250014China InspectioninstituteforElectronicProductsofShandong Jinan250000China

Hexagonal gallium nitride films were successfully fabricated throughammoniating Ga_2O_3 films deposited on silicon (111) substrates by electrophoresis. The structure,composition, and surface morphology of the formed films were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmissionelectron microscopy (TEM). The measurement results reveal that the polycrystalline GaN films withhexagonal wurtzite structure were successfully grown on the silicon (111) substrates. Preliminaryresults suggest that varying the ammoniating temperature has obvious effect on the quality of theGaN films formed with this method.

关键词： semiconductor materials GaN films electrophoresis Ga_2O_3

Behavior of gravity waves with limited amplitude in the vicinity of critical layer

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Chinese Science Bulletin 2002年第18期47卷 1547-1550页

作者： WU Shaoping & Yl FanWuhan institute of physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, china Department of Radio Science and Technology, Wuhan university, Wuhan 430072, china Department of physics, huazhong normal Univ Wuhan institute of physics and Mathematics Chinese Academy of Sciences Wuhan China Department of physics Huazhong Normal University Wuhan China Department of Radio Science and Technology Wuhan University Wuhan China

By using the FICE scheme, a numerical simulation of three-dimensional nonlinear propagation of gravity wave packet in a wind-stratified atmosphere is presented. The whole nonlinear propagation process of the gravity wave packet is shown; the propagation behavior of gravity waves in the vicinity of critical layer is analyzed. The results show that gravity waves encounter the critical layer when propagating in the fair winds whose velocities increase with height, and the height of critical layer propagating nonlinearly is lower than that expected by the linear gravity waves theory; the amplitudes of gravity waves increase with height as a whole before gravity waves encounter the critical layer, but the increasing extent is smaller than the result given by the linear theory of gravity waves, while the amplitudes of gravity waves reduce when gravity waves meet the critical layer; the energy of wave decreases with height, especially at the critical layer; the vertical wavelength reduces with the height

关键词： gravity waves critical layer FICE scheme simulation.

Analysis of Volume Hologram Using Fresnel Coefficient Matrix

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Chinese Journal of Lasers 1999年第4期8卷 3-5页

作者： li DeNow is working in the institute of Military Police liU Dahe (Department of physics, Beijing normal university, Beijing 100875, china) Received Oct. 26, 1998 Revised manuscript received Feb. 28, 1999 北京师范大学物理系北京 100875 北京师范大学物理系北京

The spectral characteristics of volume hologram is analyzed using Fresnel coefficient matrix The volume hologram is treated as a medium in which the refractive index changes continuously The analysis is in good co... 详细信息

关键词： volume hologram Fresnel coefficient matrix diffraction spectrum

The Real-gas Effect in Single-bubble Sonoluminescence

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Communications in nonlinear Science and Numerical Simulation 1999年第1期4卷 29-34页

作者： li YUAN (LSEC, institute of Computational Mathematics and Scientific-Engineering Computing, Chinese Academy of Sciences, Beijing 100080, china) Wei WEI (Center for nonlinear Sciences, university of Science and Technology of china, Hefei 230026,china) LSEC Inst. Compl. Math./Sci.-Eng. Comp. Chinese Academy of Sciences Beijing 100080 China Center for nonlinear Sciences Univ. of Sci. and Technol. of China Hefei 230026 China Department of physics Chinese University of Hong Kong Shatin Hong Kong

The full set of hydrodynamic equations governing the oscillation of a bubble is solved numerically by using a modified equation of state with ionization. We show that the hydro-thermal process in the form of compression waves and low-level ionization are dominant inside a sonoluminescing bubble for a wide range of driving pressure. The resulting thermal bremsstrahlung radiation has pulse heights and widths that agree with experimental data for cases considered in this paper.

关键词： single-bubble sonoluminescence ionization bremsstrahlung

Proton induced X-ray emission (PIXE) analysis of sources of porcelain body of Ru Guan and Jun Guan porcelains

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Science china(physics,Mechanics & Astronomy) 2006年第4期49卷 411-420页

作者： li Guoxia1, ZHAO Weijuan1, li Rongwu2, SUN Hongwei1, GUO Min1, WANG Yanfang1, liU Hui1, ZHAO Qingyun3, SUN Xinmin3, ZHAO Wenjun3 & CHENG huansheng4 1. Faculty of Physical Engineering, Zhengzhou university, Zhengzhou 450052, china 2. Department of physics, Beijing normal university, Beijing 100875, china 3. institute of Cultural Relic and Archaeology of Henan Province, Zhengzhou 450000, china 4. institute of Modern physics, Fudan university, Shanghai 200433, china Faculty of Physical Engineering Zhengzhou University Zhengzhou 450052 China Department of physics Beijing Normal University Beijing 100875 China institute of Cultural Relic Archaeology of Henan Province Zhengzhou 450000 China institute of Modern physics Fudan University Shanghai 200433 China

34 samples of Ru Guan porcelain body and 50 samples of Jun Guan porcelain body (both kinds being in different body colors) were selected with the purpose of finding out the source of raw materials and their classification relationship so as to search for ways of non-destructive discrimination. Proton induced X-ray emission (PIXE) has been applied to these samples to determine their chemical elements. The data of seven major chemical elements collected from these samples were further studied through fuzzy cluster analysis. Results indicate that the origin of raw materials of Jun Guan porcelain body samples is comparatively more concentrated in certain places, while that of Ru Guan porcelain body samples is scattered about. The places of origin of raw materials of the majority of Ru Guan and Jun Guan porcelain body samples have something in common, but some differences still exist. It might be an important way for non-destructive discrimination among Ru Guan and Jun Guan porcelains by combining PIXE with fuzzy cluster analysis.

关键词： Ru Guan and Jun Guan porcelain, source of porcelain body, PIXE, fuzzy cluster analysis, non-destructive discrimination.

The Alternating-Direction Schemes and Numerical Analysis for the Three-dimensional Seawater Intrusion Simulation

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Acta Mathematicae Applicatae Sinica 2002年第3期18卷 389-404页

作者： Zhi-yue ZhangLASG, institute of Atmospheric physics, Chinese Academy of Sciences, Beijing 100029, china & School of Mathematics and Computer Science, Nanjing normal university, Nanjing 210097, china LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China School of Mathematics and Computer Science Nanjing Normal University Nanjing China

Both numerical simulation and theoretical analysis of seawater intrusion in coastal regions are of great theoretical importance in environmental sciences. The mathematical model can be described as a coupled system of three dimensional nonlinear partial differential equations with initial-boundary value problems. In this paper, according to the actual conditions of molecular and three-dimensional characteristic of the problem, we construct the characteristic finite element alternating-direction schemes which can be divided into three continuous one-dimensional problems. By making use of tensor product algorithm, and priori estimation theory and techniques, the optimal order estimates in H1 norm are derived for the error in the approximate solution.

关键词： Three-dimensional seawater intrusion characteristic finite element alternating-direction optimal order estimate in H^1

Residual symmetry reductions and interaction solutions of the (2+1)-dimensional Burgers equation

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Chinese physics B 2015年第1期24卷 132-138页

作者：刘希忠俞军任博杨建荣 institute of nonlinear Science Shaoxing University Department of physics and Electronics Shangrao Normal University

In nonlinear physics, it is very difficult to study interactions among different types of nonlinear waves. In this paper,the nonlocal symmetry related to the truncated Painleve′ expansion of the（2＋1）-dimensional Burgers equation is localized after introducing multiple new variables to extend the original equation into a new system. Then the corresponding group invariant solutions are found, from which interaction solutions among different types of nonlinear waves can be ***, the Burgers equation is also studied by using the generalized tanh expansion method and a new Ba¨cklund transformation（BT） is obtained. From this BT, novel interactive solutions among different nonlinear excitations are found.

关键词： residual symmetry Ba¨cklund transformation symmetry reduction solution generalized tanh expansion method