检索结果-南通市图书馆

Evolution of Bright Screening-photovoltaic Spatial Optical Solitons

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of lasers 2001年第5期10卷 28-33页

作者： LIU Jinsong (State Key Laboratory of laser technology,{2., wuhan 430074, china) 华中科技大学激光技术国家重点实验室湖北武汉

A numerical analysis of the dynamical evolution of bright screening photovoltaic (SP) spatial solitons in biased photovoltaic photorefractive materials in the case of neglecting the material loss and the diffusion is presented. When an incident optical beam is a bright SP soliton, the beam propagates along a linear path with its shape kept unchanged. When the incident optical beam is slightly different from a bright SP soliton, the beam reshapes itself and tries to evolve into a bright SP soliton after a short distance. However, when the incident optical beam is significantly different from a SP bright soliton, the beam cannot evolve into a stable bright SP soliton, and tends to experience periodic compression and expansion. For a low intensity input beam, the wave experiences a periodic process of compression first and then expansion during the initial part of the cycle. For a high intensity input beam, however, the wave will initially diffract and then experiences compression during the cycle.

关键词： nonlinear optics spatial optical solitons photorefractive effects

METHOD TO SOLVE ELASTIC CONJUGATE SURFACES IN MULTI-TEETH MESHING

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical engineering 2002年第4期15卷 348-352页

作者： Yi ChuanyunSchool of Mechanical science and engineering,{2.,wuhan 430074, china School of Mechanical science and engineering Huazhong University of Science and Technology Wuhan 430074

A method to solve the elastic conjugate surfaces in multi-teeth meshing ispresented. In mechanical manufacturing and design, there exist a lot of problems relating toconjugate surfaces, such as three-dimensional engagement, steel rolling and workpiece machining,which cause great effects on the quality of machining and performances of transmission. This methoddescribes relation between conjugate motion and elastic deformation in the process of mesh-in andmesh-out, and can be used to determine the profile of gear tooth by a certain given load sharing.

关键词： multi-teeth meshing elastic conjugate surfaces

PROFILE TOLERANCE EVALUATION OF PARAMETRIC CURVES AND SURFACES

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical engineering 2002年第2期15卷 121-125页

作者： Huang Xiaoping Xiong YoulunSchool of Mechanical science and engineering,{2.,wuhan 430074, china School of Mechanical science and engineering Huazhong University of Science and Technology Wuhan 430074

The profile error evaluation of complex curves and surfaces expressed inparametric form is considered. The linear error model is established on the base of two hypothesesfirstly. Then the profile error evaluation is converted into one of these optimal formulations:MINIMAX, MAXMIN and MINIDEX problems, which are easier to be solved than the initial form. To eachone of them, geometric condition and algebraic condition are presented to arbitrate whether theideal element reaches to the optimal position. Exchange algorithm is proven highly effective insearching for solutions to these optimization problems. At last some key problems in tolerance offreeform surfaces and curves in B spline method are discussed.

关键词： Parametric form Profile tolerance Linear error model Exchangealgorithm

Exact eigenstates for a class of models describing multiphoton processes in the presence of seven bosonic modes

在线全文

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2004年第6期47卷 649-657页

作者： ZHAN Zhiming1,LI Weibin2.YOU Jun2.XIE Xiaotao2.& YANG Wenxing2.1.State Key Laboratory of laser technology,{2. university of science and technology,wuhan 430074,china 2.Department of Physics,{2. university of science and technology,wuhan 430074,china State Key Laboratory of laser technology Huazhong University of Science and Technology Wuhan 430074 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

We present the analytical expressions of eigenstates and eigenenergies by using a parameter λ without the assumption of Bethe anzatz for three kinds of seven-bosonic-mode mixing models. The parameter is shown to be determined by the roots of a simple polynomial. We also demonstrate the exact analytical expressions of eigenstates and energies without any unknown parameter.

关键词： spectra, eigenstate, eigenvalue.

Novel Wavefront Corrector for Adaptive laser Resonator

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of lasers 1995年第1期B4卷 31-36页

作者： ZHANG Guoping YE Jiaxiong LI Zhaiguang(Mational Laboratory of laser technology,Department of Optical {2.,huazhong university of science & technology,wuhan 430074,china) huazhong Univ of science and Technology Wuhan China

ＮｏｖｅｌＷａｖｅｆｒｏｎｔＣｏｒｒｅｃｔｏｒｆｏｒＡｄａｐｔｉｖｅＬａｓｅｒＲｅｓｏｎａｔｏｒＮｏｖｅｌＷａｖｅｆｒｏｎｔＣｏｒｒｅｃｔｏｒｆｏｒＡｄａｐｔｉｖｅＬａｓｅｒＲｅｓｏｎａｔｏｒ￥ＺＨＡＮＧＧｕｏｐｉｎ... 详细信息

ＮｏｖｅｌＷａｖｅｆｒｏｎｔＣｏｒｒｅｃｔｏｒｆｏｒＡｄａｐｔｉｖｅＬａｓｅｒＲｅｓｏｎａｔｏｒＮｏｖｅｌＷａｖｅｆｒｏｎｔＣｏｒｒｅｃｔｏｒｆｏｒＡｄａｐｔｉｖｅＬａｓｅｒＲｅｓｏｎａｔｏｒ￥ＺＨＡＮＧＧｕｏｐｉｎｇ；ＹＥＪｉａｘｉｏｎｇ；ＬＩＺｈ...

关键词： adaptive optics laser resonator tilted wave front aberration correction binary optics

Structure and Magnetic Properties of Ni-doped ZnO Powder

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of wuhan university of {2.(Materials science) 2010年第5期25卷 770-773页

作者：高放赵俊 Department of Electronic science and technology Huazhong University of Science and Technology

Ni-doped ZnO nanopowder （Zn0.98Ni0.2.） was synthesized by improved coprecipitation method. The average particle size of the powder was estimated to be 50 nm. The powder was then processed by thermal treatment. Samples were annealed at 1 073, 1 2.3, and 1 473 K, respectively. The solubility of NiO in ZnO and the lattice parameters of ZnO both increased with the temperature. The magnetic property of the doped samples was examined, and hysteresis loops were got. The results showed all the samples were ferromagnetic, while powder processed at 1 2.3 K for 4 h got a highest saturation magnetization （Ms） of 0.0457 emu/g. Also, magnetic properties were related to the grain size of the powder.

关键词： ferromagnetism diluted magnetic semiconductor Ni-doped ZnO coprecipitation solid state reaction

Neural Nets:Another Paradigm for Decision Support

在线全文

学校读者我要写书评

暂无评论

Journal of Systems engineering and Electronics 1995年第2期6卷 2-8页

作者： Feng Shan (Dept. of ACE, huazhong university of science and technology, wuhan 430074,{2.) Dept. of ACE Huazhong University of Science and Technology Wuhan 430074 China

The paper presents an important aspect of Neural Nets application, i. e., their usefulness for decision support. The essential feature of the neural net approach to decision making is that it is a black-box approach, which means one does not try to model the underlying processes, but only looks for a tuning of the parameters of the neural net such that the black-box mimics the sensible behavior. Through the existing widespread applications in industry, business and science, the paper emphasizes their common property as a paradigm for decision support.

关键词： Neural network Neural-net controller Decision support Industrial applications.

Numerical　Simulation　and　Analysis　on　Deflection　of　Silicon　Mirrors　Irradiated　by　High　Power　laser

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of lasers 1995年第5期B4卷 423-430页

作者： XIA Jinan CHENG Zuhai QIU Junlin (National Laboratory of laser technology,{2. university of science and technology,wuhan 430074,china) huazhong Univ of science and Technology Wuhan China

ＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎａｎｄＡｎａｌｙｓｉｓｏｎＤｅｆｌｅｃｔｉｏｎｏｆＳｉｌｉｃｏｎＭｉｒｒｏｒｓＩｒｒａｄｉａｔｅｄｂｙＨｉｇｈＰｏｗｅｒＬａｓｅｒＸＩＡＪｉｎａｎ；ＣＨＥＮＧＺｕｈａｉ；ＱＩＵＪ... 详细信息

ＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎａｎｄＡｎａｌｙｓｉｓｏｎＤｅｆｌｅｃｔｉｏｎｏｆＳｉｌｉｃｏｎＭｉｒｒｏｒｓＩｒｒａｄｉａｔｅｄｂｙＨｉｇｈＰｏｗｅｒＬａｓｅｒＸＩＡＪｉｎａｎ；ＣＨＥＮＧＺｕｈａｉ；ＱＩＵＪｕｎｌｉｎ（ＮａｔｉｏｎａｌＬａｂ...

关键词： high power laser silicon mirror mirror deflection

Numerical simulations and experimental investigations on transverse effects of two-wave mixing in a photovoltaic photorefractive crystal

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2010年第5期53卷 856-863页

作者： CAI Xin1,2.LIU JinSong1 & WANG ShengLie1 1 wuhan National Laboratory for Optoelectronics,School of Optoelectronic science and {2.,huazhong university of science and technology,wuhan 430074,china 2.School of science,wuhan university of technology,wuhan 430070,china wuhan National Laboratory for Optoelectronics School of Optoelectronic Science and Engineering Huazhong University of Science and Technology Wuhan China School of science Wuhan University of Technology Wuhan China

The transverse effects of two Gauss waves mixing in a photovoltaic photorefractive crystal,i.e.,the dynamical evolutions of signal beam with different parameters,are traced numerically and *** the one-dimensional numerical simulations and two-dimensional experimental investigations show that the self-focusing effect of signal beam becomes more obvious as the intensity of pump beam and the angle between the signal and pump beams *** accordance with these results,the state of two Gaussian waves mixing is controllable.

关键词： numerical simulation experimental investigation two-wave mixing transverse effects Gaussian distribution