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Simulations for optimization of SSRF BPM

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Nuclear Science and Techniques 2003年第4期14卷 222-225页

作者： YANG Nuo, LIU Gui-Min (shanghai institute of applied physics, the chinese academy of sciences, shanghai 201800) shanghai institute of applied physics the Chinese Academy of Sciences 上海 201800

The wake field, impedance and output signal for SSRF BPM have been calculated and analyzed by us-ing the numerical simulation code of MAFIA. The narrow-band impedance of BPM arising from formation of reso-nance in its cavity like structure either is harmful to beam or limits the performance of BPM itself, and should be re-duced to tolerable levels. The calculated results show that there are three main peaks in the impedance spectrum ofthe SSRF BPM prototype, and two of which are above the limit. After lots of simulations for different shapes of theBPM button, a new structure of SSRF BPM have been found, and there is only one main peak, which is under thelimit, in the impedance spectrum. Its output signal also meets the requirement.

关键词：数值模拟耦合阻抗 BPM 上海同步加速器辐射装置 SSRF 束定位监视器 MAFIA模型

Synthesis of O-(2-[^(18)F]fluoroethyl)-L-tyrosine and its biological evaluation in B16 melanoma-bearing mice as PET tracer for tumor imaging

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Science china Chemistry 2007年第2期50卷 276-283页

作者： WANG MingWei,YIN DuanZhi,LI ShiQiang & WANG YongXian Radiopharmaceutical Centre,shanghai institute of applied physics,chinese academy of sciences,shanghai 201800,china Radiopharmaceutical Centre Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai China

O-(2-[18F]fluoroethyl) -L-tyrosine([18F]FET) ,a fluorine-18 labeled analogue of tyrosine,has been syn-thesized and biologically evaluated in tumor-bearing mice. The whole synthesis procedure is com-pleted within 50 min. The radiochemical yield is about 40%(no decay corrected) and radiochemical purity more than 97% after simplified solid phase extraction. [18F]FET shows rapid,high uptake and long retention in the tumor as well as low uptake in the brain. The ratios of tumor-to-muscle(T/M) and tumor-to-blood(T/B) of [18F]FET are similar to those of [18F]FDG,but the ratios of tumor-to-brain(T/Br) are 2-3 times higher than that of [18F]FDG. Autoradiography of [18F]FET demonstrates a remarkable accumulation in melanoma with high contrast. It appears to be a probable competitive candidate for melanoma imaging with PET.

关键词： [18F]FET [18F]FDG PET imaging melanoma autoradiography

Preparation and Characterization of Sol-gel Derived CH_3SiO_(3/2)-SiO_2 Thick Film

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Journal of Materials Science & Technology 1998年第6期14卷 523-526页

作者： Bing CAO and Congshan ZHU(shanghai institute of Optics and Fine Mechanics, chinese academy of sciences, shanghai 201800, china) shanghai institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

A large size CH3SiO3/2-SiO2 self sustained film with the thickness ranging from 50 to 1000 μm was prepared through sol-gel method by adopting CH3Si(OC2H5)3 and Si(OC2H5) as *** this paper, the preparation processes of this thick film are discussed in detail and XRD technique was adopted for the identification of oligomer solution. Also, IR and AFM techniques were used to investigate the film structure and surface morphology

关键词： Preparation and Characterization of Sol-gel Derived CH3SiO MTES CH

Simulation on C/A codes and analysis of GPS/pseudolite signals acquisition

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Science china(Technological sciences) 2009年第5期52卷 1459-1462页

作者： ZHANG Lei shanghai institute of Technical physics,chinese academy of sciences,shanghai 200083,china shanghai institute of Technical physics Chinese Academy of Sciences Shanghai China

The global positioning system(GPS) is an extremely mature technique in the navigation and position-ing ***,there are still some limits in some aspects and for some special ***-cially,the performance of GPS needs to be improved with technological *** a GPS-like ground transmitter,the pseudolite provides a new research direction to achieve high positioning ac-curacy and *** this paper,we describe the core technologies of designing and simulation on the coarse acquisition codes in constructing the pseudolite *** the GPS/pseudolite integration system,the signal PRN 36 of the pseudolite and the GPS satellites signals are acquired in the modified receiver based on the computer software *** is shown that the pseudolite technology is ideally suited to augment the GPS alone and provide greater integrity,availability,and continuity of the navi-gation positioning system,especially for indoor use.

关键词： GPS pseudolite coarse acquisition(C/A) code acquisition

Cytotoxicity of carbon nanotubes

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Science china Chemistry 2008年第11期51卷 1021-1029页

作者： ZHU Ying1,2 & LI WenXin1 1 Laboratory of Nano-biology and Medicine, shanghai institute of applied physics, chinese academy of sciences, shanghai 201800, china 2 Graduate School of chinese academy of sciences, Beijing 100049, china Laboratory of Nano-biology and Medicine Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai China Graduate School of chinese academy of sciences Beijing China

With large-scale production and application at large scale, carbon nanotubes (CNTs) may cause ad-verse response to the environment and human health. Thus, study on bio-effects and safety of CNTs has attracted great attention from scientists and governments worldwide. This report briefly summa-rizes the main results from the in vitro toxicity study of CNTs. The emphasis is placed on the descrip-tion of a variety of factors affecting CNTs cytotoxicity, including species of CNTs, impurities contained, lengths of CNTs, aspect ratios, chemical modification, and assaying methods of cytotoxicity. However, experimental information obtained thus far on CNTs' cytotoxicity is lacking in comparability, and some-times there is controversy about it. In order to assess more accurately the potential risks of CNTs to human health, we suggest that care should be taken for issues such as chemical modification and quantitative characterization of CNTs in cytotoxicity assessment. More importantly, studies on physical and chemical mechanisms of CNTs' cytotoxicity should be strengthened; assaying methods and evaluating criteria characterized by nanotoxicology should be gradually established.

关键词： carbon nanotubes (CNTs) cell bio-security

Intermediate energy light sources and the SSRF project

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Nuclear Science and Techniques 2003年第1期14卷 1-8页

作者： ZHAO Zhen-Tang(shanghai institute of Nuclear Research, the chinese academy of sciences, shanghai 201800) shanghai institute of Nuclear Research the Chinese Academy of Sciences 上海 201800

Advances in insertion device technology, top-up operation and superconducting RF cavities make it possible to generate high brightness X-ray with intermediate energy light sources, which leads a new trend in designing and constructing third generation light sources around the world. The development status and the remarkable technical features of intermediate energy light sources are reviewed, and the main SSRF properties are described in this paper.

关键词：软X射线光源 SSRF 核技术上海同步辐射装置应用电子应用光束稳定性化学结构结构分析

Coherent transition radiation from REB in plasma ripple

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Nuclear Science and Techniques 2000年第1期11卷 45-51页

作者： DAI Zhi-Min ZHANG Jin-Song ZHAO Xiao-Feng (National shanghai Synchrotron Radiation Center shanghai 201800 shanghai institute of Nuclear Research, the chinese academy of sciences, shanghai 201800 institute of Plasma physics, the chinese academy of Scien 中科院上海原子核所国家上海同步辐射中心上海 201800 中科院等离子体物理所安徽合肥 230031

The coherent transition-radiation emission from an underdense rela tivistic beam of electrons, travelling through a dense plasma ripple, was studied. The evolution of this radiation field is described by a set of self-consistent pendulum-wave equations. Analytic calculations of the small-signal gain and numerical computations of the nonlinear saturation of this emission are presented. It is shown that such a device may provide a source of tunable coherent radiation ranging from the microwave to the infrared region.

关键词：等离子体自由电子激光器 REB 跃迁辐射相对论电子束

Transverse patterns and spatiotemporal instability of a photorefractive oscillator

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chinese Science Bulletin 1997年第9期42卷 724-729页

作者： ZHUANG Jun and TAN Weihan1. shanghai institute of Optics and Fine Mechanics, chinese academy of sciences, shanghai 201800, china 2. shanghai University, shanghai 201800, china shanghai institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China shanghai University Shanghai China

IN time realm,instability and chaos phenomena of a nonlinear optical system have been dis-cussed *** recent years,as much interest was attracted to the transverse ef-fects in nonlinear optics,the study was developed t... 详细信息

关键词： photorefractive oscillator spatiotemporal instability transverse patterns.

Filtering-efficiency measurement of chinese-made filter 1by double-filter method

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Nuclear Science and Techniques 1999年第3期10卷 168-170页

作者： ZHI Min (shanghai institute of Nuclear Rcsearrh, the chinese academy of sciences, shanghai 201800) shanghai institute of Nuclear Research Chinese Academy of sciences Shanghai 201800 China

Filtering efficiency of the chinese-made filter 1 has been measured by the double-filter method with only one set of measurement equipment. The β counts of the two filters are measured in turn for every 3 minutes, from which the decay constants are extracted to be 0.0131 min-1 and 0.0129 min-1 for the first and second filter respectively. After correcting the β counts of the second filter, the filtering efficiency of the filter is obtained to be (87.4±0.7)% in average.

关键词：滤波器双重滤波方法滤波效率