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Laser Enhanced Ionization Spectrometry

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光电子.激光 1989年第2期 115-117页

作者： Zhang ZaiXuanThe First Department, China Institute of MetrologyJiaogong 3rd Road, Hangzhou, tel. 885024-221, ZhejiangP.R.China

The basic principle of laser enhanced ionization spectrometry (LEIS) and connection with LEIS and optical transformation are discussed, LEIS and the sensitive detection of 22 trace elements have been researched. In th... 详细信息

关键词： Laser Enhanced Ionization Spectrometry

High-power, Intense-current DensityPseudospark Electron Beam Drivenby a Modified Pulsed Line Accelerator

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Chinese Journal of Lasers 1996年第1期B5卷 77-80页

作者： ZHU Junbiao(Institute of High Energy Physics, Academia Sinica, P. O. Box:2732, 100080 Beijing, China, tel.0086-010-2554583, Email:Zhujb@bepc3. ihep. ac. cn.)WANG Zhijiang WANG Mingchang ZHANG Lifeng LU Zhaitong(Shanghai Institute of Oplics and Fine Mech Shanghai Inst of Optics and Fine Mechanics Shanghai China

A high power, intense current density electon beam was generated in the Pseudospark chamber filled with 15pa N2driven by a modified pulse line accelerator. The beam was ejected with 1mm diameter, 2kA beam current, and 400ns pulse length at 200kV. At 5cm from the anode it penetrated a 0. 3mm hole on a 0. 05mm thickness copper foil; at 15cm its high energy beam component penetrated a 0. 6mm hole on an acid-sensitive film.

关键词： high-brightness electron beam pseudospark discharge pulse line accelerator

SEDIMENTATION AND CONSOLIDATION OF A HIGH WATER CONTENT SOIL

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International Journal of Sediment Research 2000年第3期15卷 269-276页

作者： ALEXIS Alain, LE BRAS Gilbert Researcher, Laboratoire de Genie Civil de Names Saint-Nazaire, IUT de Saint-Nazaire, Saint Nazaire,France PHD Student, Laboratoire de Genie Civil de Names Saint-Nazaire, IUT de Saint-Nazaire, Saint Nazaire,France tel. 00 33 Lab. de Genie Civ. de Nantes IUT de Saint-Nazaire Saint Nazaire France

The permanent siltation of harbours and estuaries has led their administrative companies to undertake dredging operations in order to guarantee a minimal water depth required for free access to port infrastructures. This long and expensive work interferes with the port trade. Dredged material is injected into the sea with the creation of a maritime dump or stocked on earth in basins. In each case, there will be a formation of a high water content soil. This paper deals with the geotechnical formation of high water content soils by means of an experimental laboratory sedimentation/consolidation bench. We have devised and realized a controlled bench which allows us to analyze the natural soil formation under self weight. The tested soil settles in sedimentation/consolidation columns (1.5 m. in height, 100 mm in diameter). Pressure and density measurements in the tested soil are possible on the whole height of the vertical column. Values of density are obtained by gamma-densimetry. The precision of the measurements is +/-0.5% for the density and +/-3 Pa for the pressures. Each test is performed over 32 days with 17 intermediate times. An originality of this bench lies in the fact that it allows measurements with a good precision in density and pressure at a very early state of soil formation (first values at 1 .33 min. from the beginning of the test). The test we are presenting concerned the natural mud found in the Loire estuary (France) prepared to an initial concentration of 200 g/ 1 (density 1. 135). These measurements are studied in terms of evolution of total stress, excess pore pressure, void ratio and effective stress as related to time. For this test, we present the density and pressure measured profiles as well as the deduced effective stress curves, paths of particles and rates of consolidation. On a void ratio versus effective stress diagram, we clearly show the evolution of soil consolidating under self weight during the intermediate phase of its formation

关键词： High water content soils Sedimentation/consolidation Density Pore pressure Effective stress Particle trajectory.

MINI-TEA CO2LASER ARRAYS

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光电子.激光 1989年第2期 104-105页

作者： Pan Chengzhi Zhai Ming and Li Xiping Beijing Vacuum Electronics Research InstituteP.O.Box 749-31 tel. 47.1731-561Beijing China

MiniTEA CO2laser arrays are reported in this *** not only can deliver multi CO2laser beams synchronously, but also can deliver various CO2 laser outputs with high quality by using optical system combinations.

关键词： TEA MINI-TEA CO2LASER ARRAYS CO

INTERMEDIA TETEMPERATURE STRESS ANOMALY IN B_2 ALLOYS: WITH SPECIAL ATTENTION TO THE CASE OF IRON ALUMINIDES

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中国有色金属学会会刊：英文版 1999年第S1期9卷 157-168页

作者： D.G.Morris Institute of Structural Metallurgy, University of Neuchtel. 2000 Neuchtel. Switzerland

The iron aluminides show anomalous stress peaks at temperatures of the order of 400～600 ℃, irrespective of whether the crystal structure is B2 type or DO 3 type. Such features will be examined on the basis of thermally activated dislocation processes, considering the influence of test parameters such as temperature and strain rate, and material parameters such as crystal composition and orientation. Detailed analyses of deformation modes by slip step studies, transmission electron microscopy examinations of dislocation structures, and texture studies will also be considered. Observations of dislocation structures are clearly of great interest for suggesting the possible models of deformation, but suffer from two major weaknesses: the post mortem structures in samples deformed at high temperature may not be the same as those producing plasticity; almost all possible hypotheses for strengthening can find support from such observations, since almost all imaginable dislocation configurations can be found with sufficient diligence by the researcher. Strengthening at intermediate temperatures in DO 3 and B2 ordered iron aluminides will be analysed here, making combined use of observations of deformation structures and examinations of the influence of varying the deformation parameters.

关键词： Iron aluminides B2 alloys stress anomaly

The Beam Propagation Factor M^2 of Fiber Cross-Section Diffraction

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光学学报 2003年第S1期23卷 25-26页

作者： Wang Ke, Guo Fuyuan, Lin BinCNERC for Optical Instrument, State Key Lab of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, P. R. China, tel. 86-571-87951213, Fax: 86-571-87951214,E-mail: wangke79@*** Institute of Laser, Fujian Normal University, P. R. China, tel. and Fax: 86-591-3465373, E-mail:guofy@*** CNERC for Optical Instrument State Key Lab of Modern Optical Instrumentation Department of Optical Engineering Zhejiang University P. R. China CNERC for Optical Instrument State Key Lab of Modern Optical Instrumentation Department of Optical Engineering Zhejiang University P. R. China Institute of Laser Fujian Normal University P. R. China

Based on non-paraxial scalar theory, the beam quality factor M2 of LR propagating mode is studied. The result shows M2 factor is greater than 1 and it increase as A increases.

关键词： of or be in it mode than

DWDM Devices Based on Planar Waveguide Technologies

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光学学报 2003年第S1期23卷 163-164页

作者： Sailing He Daoxin Dai Zhimin Shi Jun Song Qincun ZhouJoint Laboratory of Optical Communications of Zhejiang University, Centre for Optical and Electromagnetic Research, Zhejiang University, Yu Quan, Hangzhou 310027, P. R. China, tel.: +86(571)87952122, Fax: +86(571)87952449,E-mail: sailing@*** Joint Laboratory of Optical Communications of Zhejiang University Centre for Optical and Electromagnetic Research Zhejiang University Yu Quan Hangzhou 310027 P. R. China

A review is presented on some of our recent results for designs, simulations and fabrication of several photonic integrated devices, such as arrayed-waveguide gratings (AWGs) and etched diffraction gratings (EDGs), based on planar waveguide technologies. Some novel designs for flat-top AWGs and EDGs with flat-top spectral responses are presented.

关键词： DWDM Devices Based on Planar Waveguide Technologies of be with in AWG for MMI on

INFLUENCE OF TWINNING AND DISLOCATION GLIDE DURING CREEP OF EQUIAXED AND LAMELLAR TiAl ALLOYS

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中国有色金属学会会刊：英文版 1999年第S1期9卷 244-253页

作者： M.A.Morris and M.Leboeuf Institute of Structural Metallurgy, University of Neuchtel. 2000 Neuchtel. Switzerland

The creep deformation of two near γ titanium aluminide alloys with equiaxed and lamellar structures have been studied to understand their behaviour as a function of microstructural evolution during the early stages of creep. The lamellar alloys exhibit more pronounced hardening during the primary stage of creep leading to a much better creep resistance and a minimum creep rate two orders of magnitude lower than that of the equiaxed alloys. TEM observations have confirmed that the active deformation mechanisms are the same for both alloys and microstructural states, namely extensive slip of single 1/2〈110〉 dislocations and mechanical twinning. The latter has been comfirmed to occur in a fraction of the grains that never exceeds 50% while 1/2〈110〉 dislocations are active within all the γ grains. The twins are only responsible for a small amount of strain but they lead to a subdivision of the microstructure and determine (directly or indirectly) the hardening process observed during the primary stage of creep. During the secondary stage the creep rate is determined by the unblocking of pinned dislocations by processes such as a pipe diffusion or cross slip that allow thermally activated glide of 1/2〈110〉 dislocations within the γ matrix.

关键词： eguiaxed TiAl alloy lamellar TiAl alloy creep twinning dislocation glide

Single Molecule Imaging in Living Cell with Optical Method

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光学学报 2003年第S1期23卷 809-810页

作者： Guiying Wang , Zhizhan XuZhihua Ding, Zhifeng Fan, Lisong Yang, Li Liu, Xiaoqing Deng , Qinghua WuShanghai Institute of Optics and Fine Mechanics, CAS, P.R.ChinaPO Box 800211, Shanghai, 201800, tel.:0086-021-69918800E-mail: gywsiofim@mail.shcnc.ac.cnYizhang Chen Medicine Institute of Zhejiang University Shanghai Institute of Optics and Fine Mechanics CAS P.R.China PO Box 800211 Shanghai 201800 Medicine Institute of Zhejiang University

Significance, difficult, international developing actuality and our completed works for single molecules imaging in living cell with optical method are described respectively. Additionally we give out some suggestions... 详细信息

关键词： in et Cell Single Molecule Imaging in Living Cell with Optical Method have with