National Synchrotron Radiation Laboratory

Hefei, China

National Synchrotron Radiation Laboratory

Hefei, China

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Chen X.,Hefei University of Technology | Hou S.,National Synchrotron Radiation Laboratory | Chu J.,China Academy of Engineering Physics | Xiong Y.,National Synchrotron Radiation Laboratory | And 3 more authors.
Micromachines | Year: 2017

Nowadays, researchers are focusing on sorting, characterizing and detecting micron or submicron particles or bacteria in microfluidic chips. However, some contradictions hinder the applications of conventional microfluidic chips, including the low working distance of high resolving power microscopy and the low light transmittance of conventional microfluidic chips. In this paper, a rapid and readily accessible microfluidic fabrication method is presented to realize observation with high magnification microscopy. With the one-step molding process, the interconnections, the thin observation interface of polydimethylsiloxane (PDMS) membrane and microfluidic channels were integrated into an intact PDMS replica. Three kinds of PDMS replicas with different auxiliary beams were designed and optimized by leakage experiments and analytical software. The observation interfaces of a 170 μm thickness PDMS membrane enlarges the application domain of microfluidic chips. By adopting a solution of high magnification observation, microfluidic devices could be applied widely in medical science, biology and material science. © 2017 by the authors.


Liu C.-S.,National Synchrotron Radiation Laboratory | Zhou Z.-R.,National Synchrotron Radiation Laboratory | Sun B.-G.,National Synchrotron Radiation Laboratory | Luo Q.,National Synchrotron Radiation Laboratory | Cheng C.-C.,National Synchrotron Radiation Laboratory
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2016

In order to further enhance the performance of HLS II and lay the foundation for top-off injection in the future, a new bunch-by-bunch beam current measurement system has been developed. The system's hardware are mainly consist of ADC,FPGA and USB, it has high sample precision, simple structure and is low cost. Because the peak value of BPM's sum signal contains bunch current information, so the system can get bunch current by way of sampling the peak value. On-line test result shows that beam's longitudinal oscillation has great influence on measurement precision, when the longitudinal feedback is on and the longitudinal oscillation has been inhibited, the system's bunch current measurement has a high precision, the RMSE value of single bunch current can reach 0.002 mA.When the longitudinal feedback is off, the precision of measurement becomes worse. Besides the bunch-by-bunch beam current measurement, the bunch-by-bunch longitudinal tune is measured by the system, and other potential bunch-by-bunch beam diagnostics could be done in the future,like bunch-by-bunch beam life et al., to improve the performance of the storage ring of Hefei light source. © 2016, Editorial Board of Nuclear Electronics & Detection Tech. All right reserved.


Chenglin L.,Yancheng Teachers University | Xiaohua W.,Yancheng Teachers University | Xinyi Z.,Fudan University | Guobin Z.,National Synchrotron Radiation Laboratory
2012 5th International Conference on Biomedical Engineering and Informatics, BMEI 2012 | Year: 2012

The vacuum ultraviolet (VUV) spectra of breast sickness tissues, benign or malign breast tumors were studied under the excitation of different VUV photons from a synchrotron radiation light source. The excitation spectra of different samples were monitored at 400 nm and 550 nm. The efficient excitation wavelengths were 133 nm, 193 nm and 252 nm, respectively. The differences of their fluorescence spectra were analyzed, and the results showed that their VUV spectra were different for various breast sickness tissues. There were two peaks in the spectrum when these tissues were excited by 133 nm. When 193 nm light was used to excite the tissues, there appeared a three-peak structure. There was only one distinct peak when these tissues were excited by 252 nm light. The differences of VUV spectra reflect the characteristics of various kinds of breast sickness tissues. The VUV fluorescence technique may be used in the diagnoses of breast tumor, especially available in finding the early cancers. © 2012 IEEE.


Zhu L.,USTC | Bao Y.,USTC | Wang S.-G.,UNCC | Zhou Q.,Huawei | Bao X.,National Synchrotron Radiation Laboratory
Lecture Notes in Electrical Engineering | Year: 2012

Accuracy of independent GPS navigation systems is tied to the map-matching (MM) algorithm, which overcomes GPS error and traffic map error to map ve-hicle GPS tracks onto corresponding roads. This paper presents a map-matching process compatible with junction adjusting. An innovative idea is expressed in pa-per to improve the accuracy of intersection node at vector map by utilizing the large amounts of GPS trajectory data, which come from map-matching procedure. With the adaptively corrected digital map, the simulation result gave better map-matching effect, and showed the effectiveness of map-matching compatible with junction adjusting. © 2012 Springer-Verlag Berlin Heidelberg.


Sun Y.,USTC | Shen L.,USTC | Wang X.,USTC | Shu Z.,USTC | Pei Y.,National Synchrotron Radiation Laboratory
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2010

Collinear load instead of traditional waveguide load is advanced for Linac miniaturization. In order to develop high power collinear load, an efficient microwave-absorbing material of FeSiAl is employed, meanwhile responding simulation design method is proposed in this paper. CST simulations demonstrate that the operation frequency of the cavity falls linearly with a rate of about -14.74 kHz/mm3 to the FeSiAl coating volume, while the quality factor appears inversely proportional and can drop to about 25. Cavity dimensions were adjusted to compensate the frequency shift from 2856 MHz. Orthogonal tests indicate that the real part of the permeability of FeSiAl notably affect the operation frequency of load cavities, while the imaginary part of the permeability acts on the attenuation much. Eventually based on uniform power absorption principle, a six-cavity collinear load was designed with one-way attenuation of -29.47 dB, and the detail parameters are presented. © 2010 Elsevier B.V. All rights reserved.


Liu G.,National Synchrotron Radiation Laboratory | Wang L.,National Synchrotron Radiation Laboratory | Li W.,National Synchrotron Radiation Laboratory | Xuan K.,National Synchrotron Radiation Laboratory
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference | Year: 2013

Frequency analysis of the turn-by-turn BPM(Beam Position Monitor) data is a very useful numerical method for analysing the detrimental effect of the nonlinear resonances in storage rings, which has been used for nonlinear resonances measurement and correction by numerical fitting of the lattice components. The method is applied in HLSII storage ring for nonlinear model calibration by numerical fitting of the sextupole components with the effect of radiation damping and decoherence in this paper. Copyright © 2013 by JACoW.


Li S.-R.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Yesibolati N.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Qiao Y.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Ge S.-Y.,CAS Hefei Key Laboratory of Materials for Energy Conversion | And 3 more authors.
Journal of Alloys and Compounds | Year: 2012

Porous thin films composed of complex Fe/V oxides (crystalline Fe 2V 4O 13 and amorphous Fe 2V 4O 12.29) are prepared by electrostatic spray deposition technique. The crystalline Fe 2V 4O 13 thin film shows a high initial capacity of 409 mAh g -1. The cyclic voltammetry analysis of a Fe 2V 4O 13/Li cell reveals that the crystalline Fe 2V 4O 13 undergoes an irreversible phase transition when the lower cut-off voltage is below 2.5 V. Compared with the crystalline Fe 2V 4O 13, the amorphous Fe 2V 4O 12.29 thin film delivers a lower initial capacity of 349.9 mAh g -1 but exhibits better cycling performance in the voltage range of 1.0-4.0 V. After 50 cycles, its capacity can still reach around 200 mAh g -1. X-ray photoelectron spectroscopy (XPS) reveals that the Fe 2V 4O 12.29 thin film contains ions of mixed valence states V 5+/V 4+ and Fe 3+/Fe 2+, resulting in better rate capability for Fe 2V 4O 12.29 than for Fe 2V 4O 13. These results indicate that the amorphous Fe/V-oxide film is a promising electrode material for high energy applications. © 2011 Elsevier B.V. All rights reserved.


Li G.,Xidian University | Li Z.,Xidian University | Cao Q.,Xidian University | Huang Y.,Xidian University | Shi J.,National Synchrotron Radiation Laboratory
International Journal of Applied Ceramic Technology | Year: 2013

Terbium-activated YAl3(BO3)4 (YAl 3(BO3)4:Tb3+) phosphors were synthesized by both combustion method and solid-state reaction. It was found that the pure-phase YAl3(BO3)4 phosphors synthesized by combustion method were obtained at 1000°C, which was 200°C lower than that by solid-state reaction. The average particle size of the combustion-derived phosphors increased with increasing temperatures. The luminescence characteristics in ultraviolet (UV) - vacuum ultraviolet (VUV) ranges for the YAl3(BO3)4:Tb3+ phosphors were investigated. The bands from 175 nm to 300 nm were attributed to the 4f8-4f75d1 transitions of Tb3+. The other strong bands in the region from 125 nm to 175 nm were assigned to host absorption. The emission spectra showed the strongest emission at 542 nm corresponding to the 5D4→7F5 transition of Tb3+. Moreover, the combustion-derived YAl 3(BO3)4:Tb3+ phosphors generated more intense luminescence than the solid-state-derived phosphors under UV excitation. © 2013 The American Ceramic Society.


Wang M.,University of Science and Technology of China | Bao X.,National Synchrotron Radiation Laboratory | Zhu L.,University of Science and Technology of China | Bao Y.,University of Science and Technology of China
Advanced Materials Research | Year: 2012

Accuracy of independent GPS navigation systems is tied to the map-matching algorithm, which overcomes GPS error and traffic map error to map vehicle GPS tracks onto corresponding roads. The paper proposed an improved map-matching algorithm in which an intersection-based dynamic parallelogram criterion is used to improve the accuracy of navigation systems greatly. © (2012) Trans Tech Publications, Switzerland.


Li S.-R.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Ge S.-Y.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Qiao Y.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Chen Y.-M.,CAS Hefei Key Laboratory of Materials for Energy Conversion | And 3 more authors.
Electrochimica Acta | Year: 2012

Three-dimensional (3D) porous V 2O 5 and Fe 0.1V 2O 5.15 thin films have been prepared by electrostatic spray deposition technique. X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy are employed to investigate the structures and valence states of the films. Galvanostatic cell cycling, cyclic voltammetry and impedance spectroscopy are used to characterize their electrochemical properties. The Fe 0.1V 2O 5.15 thin film shows much better cycling performance than the non-doped V 2O 5 thin film. Fe 3+ can act as a stabilizing agent in the layered V 2O 5 and increase the reversibility of the charge and discharge processes towards deeper depth of lithium insertion/extraction. The dissolution of the active material in the electrolyte can also be significantly suppressed in the Fe-doped sample. Nevertheless, the Fe-doping causes a slight decrease in lithium ion diffusion coefficient. © 2012 Elsevier Ltd. All rights reserved.

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