2011
2011
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Record 385 of
Title:Single-image super-resolution based on semi-supervised learning
Author(s):Tang, Yi(1); Yuan, Yuan(1); Yan, Pingkun(1); Li, Xuelong(1); Pan, Xiaoli(2); Li, Luoqing(2)Source: 1st Asian Conference on Pattern Recognition, ACPR 2011 Volume: Issue: DOI: 10.1109/ACPR.2011.6166563 Published: 2011Abstract:Supervised learning-based methods are popular in single-image super-resolution (SR), and the underlying idea is to learn a map from input low-resolution (LR) images to target high-resolution (HR) images based on a training set. The generalization of the learned map ensures the well performance of these methods on various test images. However, the universality of these methods weakens their specificity. To enhance the performance of learning-based methods on given test images, a semi-supervised learning-based method is firstly proposed for single-image SR. In particular, test image patches are used to learn a dictionary for defining a test-data-dependent feature space. By using the learned dictionary, all LR training samples can be mapped into the test-data-dependent feature space, which makes the information contained in the training set be understood according to the given SR task. Finally, a regression function defined on the test-data-dependent feature space is learned from the refined training samples for generating SR images. The experimental results show that more details are recovered by the proposed semi-supervised method than its supervised version, which means it is a key to balance the universality and the specificity of a regression function in learning-based SR. ? 2011 IEEE.Accession Number: 20122715188505 -
Record 386 of
Title:Improvement methods of reflective photocathode QE of X-ray frame camera
Author(s):Bai, Xiaohong(1,2); Bai, Yonglin(1); Cao, Zhurong(3); Zhao, Junping(1); Liu, Baiyu(1); Qin, Junjun(1); Wang, Bo(1,2); Yang, Wenzheng(1); Gou, Yongsheng(1); Ouyang, Xian(1)Source: Chinese Optics Letters Volume: 9 Issue: SUPPL. 1 DOI: 10.3788/COL201109.S10309 Published: June 2011Abstract:Time-resolved diagnosis of the transient process using X-ray frame cameras (XRCs) is an important means in inertial confinement fusion (ICF) experiments. The sensitivity of the photocathode is a key parameter of the entire camera system. This letter aims to raise the quantum efficiency (QE) of the photocathode. With the changes in the deposition parameters, such as deposit angle, thickness of the coating in the channel, and vacuum of evaporation, the QE results are different. After testing and theoretical calculation, we find that there is a best matching value among these parameters. When the coating parameter meet this best value, the gain of the XRC can be improved significantly. ? 2011 Chinese Optics Letters.Accession Number: 20113214224379 -
Record 387 of
Title:General expression of optic path difference of reflecting rotating Fourier transform spectrometer
Author(s):Zhou, Jin-Song(1); Xiangli, Bin(1); Wei, Ru-Yi(2); Jing, Juan-Juan(2)Source: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis Volume: 31 Issue: 1 DOI: 10.3964/j.issn.1000-0593(2011)01-0263-04 Published: January 2011Abstract:The principle of reflecting rotating Fourier transform spectrometer was introduced in the present paper. Based on the Malus law and reflecting characteristic of cube corner, the optic path difference of reflecting rotating Fourier transform spectrometer was analyzed and calculated by choosing the center of rotating mirror as a reference point of the aplanatic surface of incidence beam and return beam. General expression of optic path difference at any time and maximal optic path difference of reflecting rotating Fourier transform spectrometer was presented. The factors that influence the maximal optic path difference and the period of optic path difference were analyzed. The results provide a theoretical guidance for design and manufacture of reflecting rotating Fourier transform spectrometer.Accession Number: 20110313592305 -
Record 388 of
Title:Relay lens design for an LCTF multi-spectral imager
Author(s):Fu, Qiang(1,2); Huang, Min(3); Jing, Juanjuan(1,2); Xiangli, Bin(3)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 31 Issue: 10 DOI: 10.3788/AOS201131.1022002 Published: October 2011Abstract:Liquid crystal tunable filter (LCTF) is a powerful dispersive element in multi-spectral imaging. Its physical size, however, exceeds the flange focal distance of general commercial off-the-shelf photographic lenses, which makes it difficult to combine with commercial lenses and cameras directly for multi-spectral imaging applications. A relay lens design working at unit magnification is proposed to accommodate the interface. The spectral range is from 400 nm to 720 nm, and the working F number is 4.5. With the symmetrical design strategy, coma, distortion and lateral color are canceled out automatically. The result satisfies the requirements of multi-spectral imaging. This system is compact and low-cost. It is applicable to the design of a portable multi-spectral imager based on the liquid crystal tunable filter.Accession Number: 20114914584035 -
Record 389 of
Title:Passive measurement technology used for upper atmosphere measurement
Author(s):Zhang, Chunmin(1,2); Zhu, Huachun(1,2); Wang, Dingyi(1,3); Zhao, Baochang(4); Dai, Haishan(1,2); Zhang, Lin(1,5)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 31 Issue: 9 DOI: 10.3788/AOS201131.0900136 Published: September 2011Abstract:The history, status and the future of the passive measurement technology used for upper atmosphere measurement (UAM) are introduced. The principle and method for UAM are introduced. The emission source, four intensities method, and limb measurement model for UAM are presented. The design and manufacture of field-widened, achromatic, temperature compensation wind imaging interferometer (FATWindII) developed are described emphatically. The laboratory experimental system for simulation measurement of FATWindII is built up. Based on this experimental system, some simulation measurement results of velocity, temperature and pressure of upper atmosphere are presented in this paper. The research has scientific significance and practical value for physical geography, atmospheric science, environment protection, national defense and national economic construction.Accession Number: 20114914584087 -
Record 390 of
Title:Development of Shenguang III facility general diagnostic instrument manipulator
Author(s):Yang, Zhenghua(1); Liu, Shenye(1); Cao, Zhurong(1); Jiang, Shaoen(1); Ding, Yongkun(1); He, Junhua(2); Zhang, Min(2); Wei, Mingzhi(2); Wang, Wei(2); Yang, Zhiwen(1,3)Source: Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams Volume: 23 Issue: 1 DOI: 10.3788/HPLPB20112301.0115 Published: January 2011Abstract:The Shenguang III facility general diagnostic instrument manipulator provides a diagnostic platform to insert or retract various diagnostic systems into and out of the target chamber. It provides precision radial positioning and pointing capability, and it can carry diagnostic systems to specific position. It can also ensure the installation, debugging and maintaining of diagnostic system without affecting the vacuum in the target chamber. Installed on the Shenguang III prototype facility, it provides the radial positioning accuracy of 36 μm, and the pointing precision of 13 μm in X direction and 8 μm in Y direction. Full path positioning repeatability is 20 μm in radial direction, 30 μm in X direction and 12 μm in Y direction. Laser shot testing with X-ray framing camera indicates that, pointing accuracies in X and Y directions, radial positioning accuracy, vacuum capability, interface all meet the requirements of physical experiments. The manipulator also has the immunity to electromagnetic interference and radiation.Accession Number: 20111013735394 -
Record 391 of
Title:Generation of rotating intensity blades by superposing optical vortex beams
Author(s):Yang, Dexing(1,2); Zhao, Jinhu(1); Zhao, Teng(1); Kong, Lingchen(1)Source: Optics Communications Volume: 284 Issue: 14 DOI: 10.1016/j.optcom.2011.03.075 Published: July 1, 2011Abstract:A kind of optical beam with controllable rotating intensity blades is generated by coaxially superposing two optical vortex beams with frequency difference (Δω), different topological charges (m1 and m2) and equal amplitude. It is shown theoretically that the number of the blades is determined by the subtraction of topological charges (m 1 - m2) and the angular velocity of the rotating pattern is equal to Δω / (m1 - m2). In our experiment, the rotating beams were generated by two optical vortex beams with opposite topological charges, where the frequency difference is acquired by a rotating plate glass. The results are quite in accordance with the simulations. ? 2011 Elsevier B.V. All rights reserved.Accession Number: 20112013986706 -
Record 392 of
Title:Microplasma technology and its applications in analytical chemistry
Author(s):Yuan, Xin(1); Tang, Jie(2); Duan, Yixiang(1,3)Source: Applied Spectroscopy Reviews Volume: 46 Issue: 7 DOI: 10.1080/05704928.2011.604814 Published: October 2011Abstract:This review article describes some existing microplasma sources and their applications in analytical chemistry. These microplasmas mainly include direct current glow discharge (DC), microhollow-cathode discharge (MHCD) or microstructure electrode (MSE), dielectric barrier discharge (DBD), capacitively coupled microplasmas (CCPs), miniature inductively coupled plasmas (mICPs), and microwave-induced plasmas (MIPs). The historical development and recent advances in these microplasma techniques are presented. Fundamental properties of the microplasmas, the unique features of the reduced size and volume, as well as the advantageous device structures for chemical analysis are discussed in detail, with the emphasis toward detection of gaseous samples. The analytical figures of merit obtained using these microplasmas as molecular/elemental- selective detectors for emission spectrometry and as ionization sources for mass spectrometry are also given in this review article. Copyright ? Taylor & Francis Group, LLC.Accession Number: 20114114409572 -
Record 393 of
Title:Linear SVM classification using boosting HOG features for vehicle detection in low-altitude airborne videos
Author(s):Cao, Xianbin(1,2); Wu, Changxia(1); Yan, Pingkun(3); Li, Xuelong(3)Source: Proceedings - International Conference on Image Processing, ICIP Volume: Issue: DOI: 10.1109/ICIP.2011.6116132 Published: 2011Abstract:Visual surveillance from low-altitude airborne platforms has been widely addressed in recent years. Moving vehicle detection is an important component of such a system, which is a very challenging task due to illumination variance and scene complexity. Therefore, a boosting Histogram Orientation Gradients (boosting HOG) feature is proposed in this paper. This feature is not sensitive to illumination change and shows better performance in characterizing object shape and appearance. Each of the boosting HOG feature is an output of an adaboost classifier, which is trained using all bins upon a cell in traditional HOG features. All boosting HOG features are combined to establish the final feature vector to train a linear SVM classifier for vehicle classification. Compared with classical approaches, the proposed method achieved better performance in higher detection rate, lower false positive rate and faster detection speed. ? 2011 IEEE.Accession Number: 20120514730191 -
Record 394 of
Title:Polymer-metal complex as gel electrolyte for quasi-solid-state dye-sensitized solar cells
Author(s):Xiang, Wanchun(1,2,3); Fang, Yanyan(1,2); Lin, Yuan(1); Fang, Shibi(1)Source: Electrochimica Acta Volume: 56 Issue: 3 DOI: 10.1016/j.electacta.2010.10.061 Published: January 1, 2011Abstract:A kind of polymer-metal complex gel electrolyte is successfully prepared and is used in dye-sensitized solar cells. Raman and X-ray photoelectron spectroscopy confirm the structure of this complex and is found that the metal ion reacts with nitrogen in the polymer. This novel electrolyte shows apparent diffusion coefficient of iodide of 8.37 × 10-7 cm2 s-1 and the energy conversion efficiency of 6.10% when the amount of ZnI2 is 0.04 M. By studying the dissociation active energy of the inorganic salt in electrolytes, we find that the metal salts can dissociate more easily after reacting with polymer and as a result can provide extra free iodide ion. The cell maintains ca. 93% of its initial efficiency after 20 d without further sealing, which shows good long-time stability. ? 2010 Elsevier Ltd. All rights reserved.Accession Number: 20105213523200 -
Record 395 of
Title:Spectral discrimination method information divergence combined with gradient angle
Author(s):Zhang, Xiu-Bao(1); Yuan, Yan(1); Jing, Juan-Juan(2,3); Sun, Cheng-Ming(1); Wang, Qian(1)Source: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis Volume: 31 Issue: 3 DOI: 10.3964/j.issn.1000-0593(2011)03-0853-05 Published: March 2011Abstract:The present paper proposes a spectral discrimination method combining spectral information divergence with spectral gradient angle (SID×tan(SGAπ/2)) which overcomes the shortages of the existing methods which can not take the whole spectral shape and local characteristics into account simultaneously. Using the simulation spectra as input data, according to the interferogram acquirement principle and spectrum recovery algorithm of the temporally and spatially modulated Fourier transform imaging spectrometer (TSMFTIS), we simulated the distortion spectra recovery process of the TMSFTIS in different maximum mix ratio and distinguished the difference between the recovered spectra and the true spectrum by different spectral discrimination methods. The experiment results show that the SID×tan(SGAπ/2) can not only identify the similarity of the whole spectral shapes, but also distinguish local differences of the spectral characteristics. A comparative study was conducted among the different discrimination methods. The results have validated that the SID×tan(SGAπ/2) has a significant improvement in the discriminatory ability.Accession Number: 20111413890950 -
Record 396 of
Title:A gradient anodic oxidation method for treating polyacrylonitrile-based high-modulus carbon fibers
Author(s):Hou, Yongping(1); Sun, Tongqing(2); Wang, Haojing(3)Source: Journal of Applied Polymer Science Volume: 121 Issue: 2 DOI: 10.1002/app.33761 Published: July 15, 2011Abstract:We describe a gradient anodic oxidation method. Polyacrylonitrile-based high-modulus carbon fibers were treated by the conventional and gradient anodic oxidation methods. The results show that the carbon fibers treated by the gradient method possessed a more stable tensile strength, larger NaOH uptake, shallower striations, flatter fracture surface of composites, and better interlaminar shear strength compared to those treated by the conventional method. This indicated that the gradient method was more effective in restricting the etching reaction and improving the adhesion between the carbon fibers and matrix, and we give a suggested explanation of the mechanisms. ? 2011 Wiley Periodicals, Inc.Accession Number: 20111513901548