检索结果-南通市图书馆

Experimental research of circular incoherently synthetic aperture imaging ladar using chirped-laser and heterodyne detection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2012年第9期10卷 30-34页

作者：严毅孙建锋金晓峰周煜职亚楠刘立人 Key Laboratory of Space Laser Communication and Testing Technology Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

Synthetic aperture imaging ladar （SAIL） technique belongs fully coherent processing in both the time domain and space domain and has a rather high implement difficulty. To solve this problem, the concept of circular incoherently SAIL is introduced. A speckle version image of a two-dimensional （2D） letter ＇E＇ target is reconstructed from E-field projection data detected by a circular incoherently SAIL system. The experimental system is constructed by three subsystems using chirped-pulse laser as the light source and heterodyne detection to get the range information of the target. The reconstruction of the image and the noise effect are also discussed in detail.

关键词： Computerized tomography Heterodyning Image reconstruction Light sources Synthetic apertures Time domain analysis

Narrowband optical parametric amplifier for efficient conversion of high-energy pulse with high beam quality

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2014年第9期12卷 37-40页

作者：李环环朱小磊马秀华李世光黄崇德张俊旋陈卫标 Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

In a two-stage optical parametric amplifier based on KTiOAO4 crystals, we apply beam-overlapping technique to nanosecond signal pulse amplification, which results in high conversion efficiency and good beam quality. A signal pulse energy of 66 mJ at 1.572 μm wavelength is generated with 220 mJ of pump pulse input. A maximum gain of 66 and a maximum pump depletion of as high as 44% are determined. The spectral linewidth of the amplified signal pulse is around 50 MHz, and the beam quality factor of M2 is less than 2.3.

关键词： Conversion efficiency Light amplifiers Optical pumping

Laboratory demonstration of spotlight-mode down-looking synthetic aperture imaging ladar

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2015年第9期13卷 20-24页

作者：张宁卢智勇孙建锋周煜栾竹孙志伟李光远刘立人 Key Laboratory of Space Laser Communication and Detection Technology Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

We present a tabletop-scale spotlight-mode down-looking synthetic aperture imaging ladar （DL SAIL） demon- strator, which is performed by a collimator with 10 m focal length to simulate the far-field optical field. A specular-point target and a diffuse-reflection target have been used for resolution analysis and 2D imaging, respectively. The experimental result is in agreement with the theoretical design. The experiment setup is capable of simulating a real application scenario for further study. This Letter is focused on the proposition and implementation of spotlight-mode DL SAIL.

关键词： Optical collimators Synthetic apertures

The seasonal dynamics of geochemical characteristics of sediments in the impact zone of the fish farm(Lake Ladoga,Russia)

在线全文

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2023年第6期8卷 654-660页

作者： Artem Lapenkov Alina Guzeva Ksenia Zaripova Zakhar Slukovskii St.Petersburg Federal Research Center of the russian academy of Sciences(SPC RAS) Institute of Limnology of the Russian Academy of SciencesLaboratory of Geography and Hydrology9Sevastyanova St.St.Petersburg196105Russia institute of the North Industrial Ecology Problems of Kola Science Center of RAS Academgorodok Str.141Apatity184209Russia

This study focuses on the analysis of seasonal dynamics of physicochemical parameters(pH and Eh)and organic matter content in the sediments accumulated within the impact zone of the cage trout farm(Lake Ladoga,Russia).The Ladoga is the largest lake in Europe and there are more than 20 fish farms located in the northern part of the *** geochemical research is necessary for predicting the negative impact of the polluted sediments on both the cage fish and the aquatic *** sampling was conducted during various seasons of the year(February,June,August,October)which were characterized by the different fish feeding *** sediment cores were collected at 7 points,including the cage and reference sites(150 m and 600 m far from the farm).The results showed that the accumulation of organic material released from the studied fish farms was local and the wastes did not enter the sediments at the control ***,the accumulated organic layer can be compacted and partially mineralized during winter ***,strongly reducing conditions in sediments occur due to the accumulation of organic material and low rate of water exchange within the studied ***,there is a potential risk of formation of toxic gases and release of accumulated nutrients and metals from sediments to *** can have a negative impact on benthic and nekton organisms,in particular cage fish.

关键词： Sediments Organic matter Physicochemical parameters Fish farming Aquaculture Lake ladoga

Dependence of wavDependence of wavefront errors on nonuniformity of thin films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2012年第1期10卷 82-85页

作者：齐红基朱美萍张伟丽易葵贺洪波邵建达 Key Laboratory of Material Science and Technology for High Power Lasers Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences

In contrast to uncoated substrate, a nonlinear relationship of phase shift with the thicknesses of the thin film makes the calculation of wavefront aberration complicated. A program is compiled to calculate the wavefront aberration of multilayer thin film produced by thickness nonuniformity. The physical thickness and the optical phase change on reflection are considered. As an example, the wavefront aberration of the all-dielectric mirror is presented in ArF excimer lithography system with a typical thickness distribution. In addition, the wavefront errors of the thin film at wavelengths of 193 and 633 nm are compared in the one-piece and two-piece arrangements. Results show that the phase shift upon reflection of the thin film produced by thickness nonuniformity is very sensitive to the incident angle, wavelength, and polarization.

关键词： Aberrations Errors Film preparation Phase shift Phase shifters Thin films Wavefronts

Thermodynamic Properties of Li-LiH (LiD, LiT) Systems. The Phase Diagram

在线全文

学校读者我要写书评

暂无评论

Open Journal of Physical Chemistry 2012年第3期2卷 141-146页

作者： Konstantin A. Yakimovich Tatiana Biryukova Joint institute for High Temperatures russian academy of Sciences Moscow Russia The institute of Informatics Problems Russian Academy of Sciences Moscow Russia

The paper presents a comprehensive critical review and detailed analysis of the literature, published in the field of the phase diagram solution Li-LiH (LiD, LiT). Special attention is paid to the completeness of the source information on the paper’s topic resulting in an extended reference list. Particularly, paper reviews rarely used sources including little-known publications from research centers, proceedings of the international scientific meetings and dissertations. These publications were more thoroughly analyzed in order to make the information available to the scientific society.

关键词： Diagram Phase Equilibrium Lithium Hydride Deuteride

Probing mechanical principles of cell-graphene-family nanomaterials(GFNs) interaction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Probing mechanical principles of cell-graphene-family nanoma...

Measuring Telomere Length in Proliferating Cells by Flow-FISH Method

第十届全国生物力学学术会议暨第十二届全国生物流变学学术会议

作者： Jiu-ling Wang Xing-hua Shi institute of mechanics Chinese Academy of Sciences

Graphene-family nanomaterials(GFNs) including monolayer graphene,few-layer graphene,and ultrathin graphite nanosheets have potential applications for next generation microchips,composites,barrier coatings, biosensors,and drug *** are very thin,typically 1-30 graphene layers,but sheet-like or plate-like with lateral dimensions in the nm range up to several hundredμm similar to *** humans,inhalation or intravenous injection of plate-like minerals including talc,kaolinite,and mica induces lung granulomas which are formed in response to biopersistent foreign materials that are not readily engulfed and degraded by macropha-

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Life Sciences 2012年第8期6卷 945-951页

作者： Vyacheslav Borisov Olga Korolkova Elena Blinova Denis Baev Vladimir Kozhevnikov Vladimir Kozlov Research institute of Clinical Immunology Russian Academy of Medical Science Siberian Branch Novosibirsk 630099 Russia ViroStatics Sassari 07100 Italy

The purpose of present work is a measurement of telomere length dynamic in proliferating cells in vitro by modified flow-FISH method. This method is a combination of two modifications： telomere length measurement in differentiated cells by surface antigen and analysis of cells divisions＇ number by vital dye dilution. Lymphocytes were activated by anti-CD3 Abs with IL-2 presents and grown in vitro for 7 days. Cells division＇s number was measured by dilution of CFSE vital dye which cells were stained previously activation. For telomere length measurement we used flow-FISH method with Cy3 labeled telomere PNH probe. Using this method we evaluated the dynamic of telomere length in CD4＋ and CD8＋ T-cells after 7 days culturing in vitro and revealed the difference in telomere lengthening and shortening versus division rounds in cell subsets. In CD8＋ cells telomeres start lengthen on a second division with the maximum on 4th division round becoming more that 20% longer compared with undividing cells. In CD4＋ cells telomeres did not have any length peculiarities through all division rounds demonstrating different telomere regulation in subsets. This probably occurs due to the higher level ofhTERT protein expression in CD8＋ than CD4＋ cells do.

关键词： Cell senescence telomere length flow-FISH CDSE lymphocytes.

Tomographic PIV investigation of coherent structures in a turbulent boundary layer flow

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第3期28卷 572-582页

作者： Zhan-Qi Tang Nan Jiang Andreas Schroder Reinhard Geisler Department of mechanics Tianjin University300072 TianjinChina Tianjin Key Laboratory of Modern Engineering mechanics 300072 TianjinChina institute of Aerodynamics and Flow Technology Department of Experimental MethodsBunsenstrasse 1037073 GiSttingenGermany

Tomographic particle image velocimetry was used to quantitatively visualize the three-dimensional co- herent structures in the logarithmic region of the turbulent boundary layer in a water tunnel. The Reynolds number based on momentum thickness is Reo = 2 460. The in- stantaneous velocity fields give evidence of hairpin vortices aligned in the streamwise direction forming very long zones of low speed fluid, which is flanked on either side by high- speed ones. Statistical support for the existence of hairpins is given by conditional averaged eddy within an increasing spanwise width as the distance from the wall increases, and the main vortex characteristic in different wall-normal re- gions can be reflected by comparing the proportion of ejec- tion and its contribution to Reynolds stress with that of sweep event. The pre-multiplied power spectra and two-point cor- relations indicate the presence of large-scale motions in the boundary layer, which are consistent with what have been termed very large scale motions （VLSMs）. The three dimen-sional spatial correlations of three components of veloc- ity further indicate that the elongated low-speed and high- speed regions will be accompanied by a counter-rotating roll modes, as the statistical imprint of hairpin packet structures, all of which together make up the characteristic of coherent structures in the logarithmic region of the turbulent boundary layer （TBL）.

关键词： Tomographic particle image velocimetry Tur-bulent boundary layer Coherent structures Hairpin vortex Very large scale motion