2011
2011
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Record 241 of
Title:Solid waste plasma disposal plant
Author(s):Yang, Liqing(1); Wang, Haojing(1); Wang, Hongfei(1); Wang, Dapeng(2); Wang, Yue(3)Source: Journal of Electrostatics Volume: 69 Issue: 5 DOI: 10.1016/j.elstat.2011.05.007 Published: October 2011Abstract:This review describes the current status of waste plasma disposal plant. A comprehensive analysis of the available scientific and technical literature on waste plasma disposal plant, including the actual plant design and configuration, operation principle of core facility, the economic viability and floor area of a plasma plant. The case on the development and large scale commercial applications of the solid waste plasma disposal plant should be further research. ? 2011 Elsevier B.V.Accession Number: 20113114203520 -
Record 242 of
Title:Effects of the host morphologies on luminescence properties of Nd 3+-doped LaF3 nanoparticles
Author(s):She, Jiangbo(1,2); Hou, Chaoqi(1,2); Guo, Haitao(1); Gao, Chao(1); Cui, Xiaoxia(1); Lu, Min(1); Wei, Wei(1,3); Peng, Bo(1,3)Source: Journal of Nanoscience and Nanotechnology Volume: 11 Issue: 10 DOI: 10.1166/jnn.2011.4961 Published: 2011Abstract:By using different surfactants, several host morphologies including rod-like, pot-like and shuttlelike of LaF3:Nd3+(1% mol) nanoparticles were prepared by a simple microemulsion hydrothermal method, and their properties were characterised by XRD, TEM and photoluminescence spectroscopy. The experimental results indicated that the rod-like and pot-like nanocrystals possess well shaped hollow structures. The analysis of spectra proved that the local environment around the dopant ion changed with the different host morphology, which in turn influenced the luminescence properties. The luminescence lifetimes derived from biexponential fitting were 615 μs (nanopots), 419 μs (nanorods) and 194 μs (nanoshuttles), respectively. This phenomenon is ascribed to the weakening effect of hollow or fenestral structures to the nonradiative ratio. Copyright ? 2011 American Scientific Publishers. All rights reserved.Accession Number: 20120814792078 -
Record 243 of
Title:All-normal dispersion, figure-eight, tunable passively mode-locked fiber laser with an invisible and changeable intracavity bandpass filter
Author(s):Li, X.H.(1,2); Wang, Y.S.(1); Zhao, W.(1); Zhang, W.(1); Yang, Z.(1); Hu, X.H.(1); Wang, H.S.(1); Wang, X.L.(1); Zhang, Y.N.(1); Gong, Y.K.(1); Li, C.(1); Shen, D.Y.(1)Source: Laser Physics Volume: 21 Issue: 5 DOI: 10.1134/S1054660X11090143 Published: May 2011Abstract:We report dissipative solitons generation in the figure-8 all-normal dispersion fiber ring laser. The steep edge of the output optical spectrum results from the filtering effect of NOLM together with polarization controllers (PCs). No any physical bandpass filters are used in the cavity. Moreover, the output wavelength can be tuned in a wide range of about 20 nm. In the long-wavelength region, the spectral filtering effect of NOLM becomes weaker and output spectrum shows only one steep side. Filtering effect can perform periodically with increasing the pump power. The highly chirped pulse has good potential for application to the chirped pulse amplification (CPA) system. ? 2011 Pleiades Publishing, Ltd.Accession Number: 20112314036748 -
Record 244 of
Title:Low-Repetition-Rate Ytterbium-Doped Fiber Laser Based on a CFBG from Large Anomalous to Large Normal Dispersion1
Author(s):Li, X.H.(1,2); Wang, Y.S.(1); Zhang, W.(1); Zhao, W.(1); Hu, X.H.(1); Yang, Z.(1); Gao, C.X.(1); Wang, X.L.(1); Liu, X.L.(1,2); Shen, D.Y.(1); Li, C.(1)Source: Laser Physics Volume: 21 Issue: 12 DOI: 10.1134/S1054660X11210110 Published: December 2011Abstract:We report on the long-cavity ytterbium-doped fiber laser based on a chirped fiber Bragg grating (CFBG) to control the dispersion in the cavity. The proposed fiber lasers operating in large anomalous dispersion and large normal dispersion are intensively studied in this paper. To the best of our knowledge, this is the first time for us to give the dispersion map over such a wide range. The experimental results show that, for large anomalous dispersion, the state of soliton rains can be obtained. Nanosecond pulse is obtained in the large normal dispersion regime with spectral filter which is different from the operation mode without spectral filter. This study may pave the way to best apply the fiber laser in many fields. ? Pleiades Publishing, Ltd., 2011.Accession Number: 20120314700420 -
Record 245 of
Title:Gaseous ammonia fluorescence probe based on cellulose acetate modified microstructured optical fiber
Author(s):Peng, Lirong(1); Yang, Xinghua(1); Yuan, Libo(1); Wang, Lili(2); Zhao, Enming(1); Tian, Fengjun(1); Liu, Yanxin(1)Source: Optics Communications Volume: 284 Issue: 19 DOI: 10.1016/j.optcom.2011.06.015 Published: September 1, 2011Abstract:In this article, we report a novel fluorescent ammonia gas probe based on microstructured optical fiber (MOF) which is modified with eosin-doped cellulose acetate film. This probe was fabricated by liquid fluxion coating process. Polymer solution doped with eosin was directly inhaled into 18 array holes of MOF and then formed matrix film in them. The sensing properties of the optical fiber sensor to gaseous ammonia at room temperature were investigated. The sensing probe showed different fluorescence intensity at 576 nm to different concentrations of trace ammonia in carrier gas of nitrogen. The response range was 50-400 ppm, with short response time within 500 ms. Furthermore, the response range could be tailored through CTAB co-entrapment process in the sensing film. These test results demonstrated that low cost, simple structured fiber optic sensors for detecting ammonia gas samples could be developed based on MOF. ? 2011 Elsevier B.V.Accession Number: 20113314229664 -
Record 246 of
Title:Multi-sensor centralized fusion without measurement noise covariance by variational bayesian approximation
Author(s):Gao, Xinbo(1); Chen, Jinguang(1); Tao, Dacheng(2); Li, Xuelong(3)Source: IEEE Transactions on Aerospace and Electronic Systems Volume: 47 Issue: 1 DOI: 10.1109/TAES.2011.5705702 Published: January 2011Abstract:The work presented here solves the multi-sensor centralized fusion problem in the linear Gaussian model without the measurement noise variance. We generalize the variational Bayesian approximation based adaptive Kalman filter (VB-AKF) from the single sensor filtering to a multi-sensor fusion system, and propose two new centralized fusion algorithms, i.e., VB-AKF-based augmented centralized fusion algorithm and VB-AKF-based sequential centralized fusion algorithm, to deal with the case that the measurement noise variance is unknown. The simulation results show the effectiveness of the proposed algorithms. ? 2011 IEEE.Accession Number: 20110613648372 -
Record 247 of
Title:Collaborative Kalman filters for vehicle tracking
Author(s):Cao, Xianbin(1,2); Shi, Zhengrong(1); Yan, Pingkun(3); Li, Xuelong(3)Source: IEEE International Workshop on Machine Learning for Signal Processing Volume: Issue: DOI: 10.1109/MLSP.2011.6064581 Published: 2011Abstract:Airborne vehicle tracking system is receiving increasing attention because of its high mobility and large surveillance scope. However, tracking multiple vehicles simultaneously on airborne platform is a challenging problem, owing to uncertain vehicle motion and visible frame-to-frame jitter caused by camera vibration. To address these problems, a new collaborative tracking framework is proposed. The framework consists of two level tracking processes: to track vehicles as groups, the higher level builds the relevance network and divides target vehicles into different groups; the relevance is calculated based on the status information of vehicles obtained by the lower level. This kind of group tracking takes into account the relevance of vehicles and reduces the impact of camera vibration, so the proposed method is applicable for multi-vehicle tracking in airborne videos. Experimental results demonstrate that the proposed method has better performance in terms of the tracking speed and accuracy compared to other existing approaches. ? 2011 IEEE.Accession Number: 20114914573652 -
Record 248 of
Title:All-optical wavelength multicasting exploiting cross-phase modulation in a dispersion-flattened nonlinear photonic crystal fiber
Author(s):Hui, Z.Q.(1,2); Zhang, J.G.(1)Source: Laser Physics Volume: 21 Issue: 3 DOI: 10.1134/S1054660X11050094 Published: March 2011Abstract:An all-optical wavelength multicasting scheme with tunable output wavelength and channel numbers has been proposed and demonstrated based on cross-phase modulation (XPM) in a dispersion-flattened highly nonlinear photonic crystal fiber. We show that the input signal wavelength can be simultaneously converted to four different wavelengths by filtering the broadened sideband of the continuous-wave (CW) probe beams. The experiments are carried out to investigate into the wavelength tunability, and exploit the dynamic characteristics with variable input signal powers, the ability of multicasting channels scalable, and the relationship between the multicasting signal qualities with variable optical band-pass filter (OBPF) bandwidth. The results indicate that the proposed wavelength multicasting scheme has the advantages of simple structure, efficient operation in a wide wavelength range, as well as transparent to bit rates. Moreover, the system can be upgraded to generate more multicasting channels by increasing the number of CW probe beams. ? 2011 Pleiades Publishing, Ltd.Accession Number: 20112013977097 -
Record 249 of
Title:Spatial diagnostics of 532-nm laser-induced aluminum plasma
Author(s):Luo, W.F.(1); Zhao, X.X.(2); Sun, Q.B.(1); Gao, C.X.(1); Tang, J.(1); Zhao, W.(1)Source: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Volume: 637 Issue: 1 SUPPL. DOI: 10.1016/j.nima.2010.02.046 Published: May 1, 2011Abstract:Spatial characteristics of the plasma generated by 532-nm Nd:YAG laser irradiation of aluminum alloy in air were studied. The electron density inferred by measuring the Stark broadened line profile of Al II at 281.62 nm decreases with increasing distance from the target surface. The electron temperature was determined by using the Boltzmann plot method. Due to thermal conduction towards the solid target and radiative cooling of the plasma, as well as conversion of thermal energy to kinetic energy, the electron temperature decreases both at the plasma edge and close to the target surface. ? 2010 Elsevier B.V. All rights reserved.Accession Number: 20112013983318 -
Record 250 of
Title:Two synchronized operating modes of femtosecond and picosecond pulses in a dual-wavelength laser
Author(s):Zhu, Changjun(1); He, Junfang(2); Zhai, Xuejun(1); Xue, Bing(1); Zhang, Chonghui(1)Source: Materials Science Forum Volume: 663-665 Issue: DOI: 10.4028/www.scientific.net/MSF.663-665.284 Published: 2011Abstract:Two synchronized operating modes of femtosecond and picosecond pulses, cross mode-locking and multi-pulse operating, are presented in a two-beam-pumped dual-wavelength Ti:sapphire laser. For the cross mode-locking mode, synchronized laser pulses of 37.5 fs and 0.891ps, with a timing jitter of 139 fs, are obtained in the femtosecond cavity and picosecond cavity, respectively. For the multi-pulse mode, pulses of 35 fs are obtained in the femtosecond cavity, whereas, multi-pulse mode appears in the picosecond cavity, with a pulse envelope width of 1.06 ps. The two operating modes can be switched from one to the other, dominated mainly by the mutual interaction between cross-phase modulation and self-amplitude modulation. ? (2011) Trans Tech Publications.Accession Number: 20105013481058 -
Record 251 of
Title:Improvement of laser pulse contrast by optical Kerr shutter
Author(s):He, Jun-Fang(1); Wu, Deng-Ke(1); Wang, Yi-Shan(1); Zhu, Chang-Jun(2); Wu, Zhen(1)Source: Guangxue Jingmi Gongcheng/Optics and Precision Engineering Volume: 19 Issue: 2 DOI: 10.3788/OPE.20111902.0470 Published: February 2011Abstract:In order to improve the laser pulse contrast, an optical Kerr shutter was used to select the main pulse to restrain the noise of the main pulse. The laser was split into two beams. One of them was used as a gate light to control the optical Kerr shutter, and the other was to be cleaned. The two beams were spacial crossed in optical Kerr materials. The open time of the optical Kerr shutter was controlled to select the main pulse, while the light outs of the shutter were blocked. Therefore, the laser pulse contrast was enhanced. The experiment result showed that the duration and the transmission ratio of the optical Kerr shutter are about 570 fs and 17%, respectively and the pulse contrast has been enhanced by 104 times. The conclusion is that the optical Kerr shutter technology can efficiently enhance laser pulse contrast.Accession Number: 20111713936118 -
Record 252 of
Title:Structural characterizations and the third-order nonlinear optical properties of poly(2,5-didecyloxy)phenylene films modified by N+ ions implantation
Author(s):Gao, Chao(1,2,3); Du, Weisong(1); Qiu, Shaojun(1); Lin, Qun(3); Wu, Hongcai(2); Liu, Xiaozeng(2); Guo, Hongyan(1); Liu, Jianqun(1)Source: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms Volume: 269 Issue: 5 DOI: 10.1016/j.nimb.2010.12.040 Published: March 1, 2011Abstract:Poly(2,5-didecyloxy)phenylene (PDDOP) films implanted by 30 keV nitrogen ions (N+) with the dose rang of 1015-1017 ions/cm2 were characterized by FTIR-ATR spectra, UV-VIS spectra and X-ray photoelectron spectroscopy, which showed that the C-H bonds of the PDDOP films were largely broken and new bonds like CC, CN and CN were formed as the increasing ion fluence. The third-order nonlinear optical susceptibilities (χ(3)) were measured by degenerate four-wave mixing (DFWM) technique at 532 nm. The results demonstrated that the (χ(3)) value of PDDOP films was maximized to 4.19 × 10-11 esu at an ion dose of 1.15 × 1017 ions/cm2, which was 4.4 times larger than that of the pristine film. The enhanced third-order nonlinear properties may attribute to the enlarged expansion coefficient and the enhanced absorption coefficient of the bombarded films at proper N+ ions dose. ? 2010 Elsevier B.V. All rights reserved.Accession Number: 20110913700165