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.


Zhang F.,USTC | Shen L.,USTC | Pei Y.,National Synchrotron Radiation Laboratory
Results in Physics | Year: 2017

This paper describes a design of a four-cavity collinear load for a compact electron LINAC. The collinear load is composed of four cavities which are coated by high-resistance material of FeSiAl. In order to get the performance parameters of the material for designing the load, this paper advances in a novel method which combines a testing and simulation. According to these parameters, the four-cavity collinear load is designed, manufactured and finally revised. Test results and running in a LINAC of 14 MeV show that the collinear load works well. © 2017


Yin X.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Li X.,National Synchrotron Radiation Laboratory | Gu W.,CAS Hefei Key Laboratory of Materials for Energy Conversion | Wang F.,CAS Hefei Key Laboratory of Materials for Energy Conversion | And 8 more authors.
ACS Applied Materials and Interfaces | Year: 2017

Ferroelectricity may promote photocatalytic performance because the carrier-separation efficiency can be effectively improved by the internal electrostatic field caused by spontaneous polarization. Heterostructures that combine ferroelectric materials with other semiconductor materials can be further advantageous to the photocatalysis process. In this work, Bi1.65Fe1.16Nb1.12O7 was hybridized with g-C3N4 via a facile low-Temperature method. The results of high-resolution transmission electron microscopy confirmed that a tight interface was formed between g-C3N4 and Bi1.65Fe1.16Nb1.12O7, which gave the (g-C3N4)-(Bi1.65Fe1.16Nb1.12O7) heterojunction a more superior visible light photocatalytic performance. The degradation of rhodamine B by optimized (g-C3N4)0.5-(Bi1.65Fe1.16Nb1.12O7)0.5 under visible light was almost 3.3 times higher than that by monomer Bi1.65Fe1.16Nb1.12O7 and 7.4 times higher than that by g-C3N4. The (g-C3N4)0.5-(Bi1.65Fe1.16Nb1.12O7)0.5 sample also showed the highest photocurrent in the photoelectrochemical tests. To further verify the benefit of the built-in electric field in terms of the photocatalytic performance, Bi2FeNbO7, with a higher spontaneous polarization, was also synthesized and hybridized with g-C3N4. Both Bi2FeNbO7 and (g-C3N4)0.5-(Bi2FeNbO7)0.5 exhibited better photocatalytic activities than those of Bi1.65Fe1.16Nb1.12O7 and (g-C3N4)0.5-(Bi1.65Fe1.16Nb1.12O7)0.5, although the latter ones had a stronger visible-light absorbance. This implies the very promising prospects of applying ferroelectric materials for solar energy harvest. © 2017 American Chemical Society.


Ding L.,Hefei University of Technology | Xuan S.,Hefei University of Technology | Xuan S.,National Synchrotron Radiation Laboratory | Feng J.,Hefei University of Technology | Gong X.,Hefei University of Technology
Composites Part A: Applied Science and Manufacturing | Year: 2017

Here reports a lastex yarn-silver nanowires-magnetic polymer based magnetic-conductive composite fibre (MCF) prepared by a simple dropping-drying process. The magnetic-mechanic-electric coupling properties of the multifunctional fibre are systematically investigated. It's found that the electrical resistance increases by 44% when the tensile strain reaches 8%. Meanwhile, the relative resistance meets a dramatically variation by applying the external magnetic field. For instance, a 1.5% relative resistance increment is achieved by bending the MCF to 44 deg under a 400 mT magnetic field, in which the magnetic induced force is equivalent to 15 mN. Afterwards, a potential mechanism is proposed to investigate the magnetic-mechanic-electric coupling behavior. The results show that the MCF can be applied both as strain sensors and magnetic field sensors. Furthermore, a magnetic-sensing on-off switch and a flexible gripper are subsequently developed, demonstrating that the MCF possesses high potential in the implement of intelligent soft sensors and actuators. © 2017


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.


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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