2014
2014
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Record 361 of
Title:Fusion of multichannel local and global structural cues for photo aesthetics evaluation
Author(s):Zhang, Luming(1); Gao, Yue(2); Zimmermann, Roger(1); Tian, Qi(3); Li, Xuelong(4)Source: IEEE Transactions on Image Processing Volume: 23 Issue: 3 DOI: 10.1109/TIP.2014.2303650 Published: March 2014Abstract:Photo aesthetic quality evaluation is a fundamental yet under addressed task in computer vision and image processing fields. Conventional approaches are frustrated by the following two drawbacks. First, both the local and global spatial arrangements of image regions play an important role in photo aesthetics. However, existing rules, e.g., visual balance, heuristically define which spatial distribution among the salient regions of a photo is aesthetically pleasing. Second, it is difficult to adjust visual cues from multiple channels automatically in photo aesthetics assessment. To solve these problems, we propose a new photo aesthetics evaluation framework, focusing on learning the image descriptors that characterize local and global structural aesthetics from multiple visual channels. In particular, to describe the spatial structure of the image local regions, we construct graphlets small-sized connected graphs by connecting spatially adjacent atomic regions. Since spatially adjacent graphlets distribute closely in their feature space, we project them onto a manifold and subsequently propose an embedding algorithm. The embedding algorithm encodes the photo global spatial layout into graphlets. Simultaneously, the importance of graphlets from multiple visual channels are dynamically adjusted. Finally, these post-embedding graphlets are integrated for photo aesthetics evaluation using a probabilistic model. Experimental results show that: 1) the visualized graphlets explicitly capture the aesthetically arranged atomic regions; 2) the proposed approach generalizes and improves four prominent aesthetic rules; and 3) our approach significantly outperforms state-of-the-art algorithms in photo aesthetics prediction. ? 2013 IEEE.Accession Number: 20141117456309 -
Record 362 of
Title:System contributing to install inside sleeve and filtering algorithm to evaluate its roundness error
Author(s):Liu, Jie(1); Li, Hua(1); Chang, Hemin(1); Jiang, Xin(1)Source: Zhongguo Jiguang/Chinese Journal of Lasers Volume: 41 Issue: 6 DOI: 10.3788/CJL201441.0608002 Published: June 2014Abstract:Nuclear evaporator has two sleeves, outside sleeve and inside sleeve. To install inside sleeve accurately, the concentricity of the two sleeves and the roundness error of inside sleeve should be evaluated. The system which contributes to install inside sleeve of nuclear evaporator is developed. It is introduced that the parts of the system and the measuring process. The position forms among three close points are divided into three forms: convex, concave and collinear in the data processing. And it is found out how to filter the points that can't fix maximum inscribed circle. Based on that, the filtering algorithm is presented. This algorithm is efficient and easy to be understood. It can save the data processing time. In practical application, the measuring accuracy of the whole system is 0.7 mm, which can meet the needs of project and have practical value.Accession Number: 20142717903303 -
Record 363 of
Title:Picosecond passively mode-locked laser of 532 nm by reflective carbon nanotube
Author(s):Cai, Wei(1); Peng, Qianqian(1); Hou, Wei(1); Liu, Jie(1,2); Wang, Yonggang(3)Source: Optics and Laser Technology Volume: 58 Issue: DOI: 10.1016/j.optlastec.2013.12.003 Published: June 2014Abstract:By using reflective single-walled carbon nanotube as the saturable absorber, passively continuous-wave mode-locked of Nd:YVO4/KTP green laser was realized for the first time. The 532 nm mode-locked pulse width was estimated to be approximately 7.1 ps. The maximum average output power of 456 mW at 532 nm was obtained at a pump power of 7.35 W, corresponding to the repetition rate of 87.14 MHz. The single pulse energy and peak power were 5.23 nJ and 0.74 kW, respectively. ? 2013 Elsevier Ltd.Accession Number: 20135217129080 -
Record 364 of
Title:Enhanced 2.7 lm emission of Er/Pr-codoped water-free fluorotellurite glasses
Author(s):Zhan, Huan(1,2); Zhang, Aidong(1); He, Jianli(1); Zhou, Zhiguang(1); Li, Lu(1,2); Shi, Tengfei(1); Xiao, Xusheng(1); Si, Jinhai(1,2); Lin, Aoxiang(1)Source: Journal of Alloys and Compounds Volume: 582 Issue: DOI: 10.1016/j.jallcom.2013.07.211 Published: 2014Abstract:Using physical and chemical dehydration technique and traditional melting and quenching method, we fabricated a group of Er/Pr-codoped water-free fluorotellurite glasses with composition of 60TeO2- 30ZnF 2-10NaF (TZNF60, mol%). The lifetime τf of 4I 11/2→4I13/2 transition, directly measured under the excitation by an optical parametric oscillator (OPO) laser system at 978 nm, in Er/Pr codoped fluorotellurite glasses is 1.37-1.55 ms, longer than that of Er-doped tellurite oxide (215 μs) and Er-doped fluorotellurite glasses (1.07 ms). The introduction of Pr3+ ions into Er-doped system increases the emission intensity at 2.71 μm (Er: 4I 11/2→4I13/2) and emission cross section as well. These advances partially arise from the absence of OH groups and low phonon energy with the addition of large amount of fluorides into oxide-based host glasses. With the high quantum efficiency and large figure of merit, Er/Pr-TZNF60 glass can be potentially a promising material for the development of mid-infrared fiber lasers at around 2.7 μm. ? 2013 Published by Elsevier B.V.Accession Number: 20133916784808 -
Record 365 of
Title:Instantaneous three-dimensional imaging using supercontinuum and ultrafast optical Kerr gate of tellurite glass
Author(s):Tan, Wenjiang(1); Zhou, Zhiguang(2); Lin, Aoxiang(2); Tong, Junyi(3); Si, Jinhai(1); Hou, Xun(1)Source: Optical Engineering Volume: 53 Issue: 4 DOI: 10.1117/1.OE.53.4.043108 Published: April 2014Abstract:An instantaneous three-dimensional imaging technique using a chirped supercontinuum and an ultrafast optical Kerr gate, in which a sapphire plate and a TeO2-ZnO-Na2O oxide glass were used to generate the chirped supercontinuum and the ultrafast optical Kerr gate, respectively, is demonstrated. This technique is applicable to ultrafast shape measurement, such as shape imaging of moving objects, or imaging of laserinduced refractive index changes in transparent media. ? 2014 Society of Photo-Optical Instrumentation Engineers.Accession Number: 20141917696132 -
Record 366 of
Title:Erratum: The performance of new polymer solar cells based on thiophene and thienyl-quinoxaline with the post treatments (Materials Letters (2014) 122 (74-77))
Author(s):Gao, Bowen(1,3); Gao, Chao(2); Wu, Haimei(2); Que, Wenxiu(3); Wei, Wei(1)Source: Materials Letters Volume: 129 Issue: DOI: 10.1016/j.matlet.2014.05.053 Published: August 15, 2014Abstract:nullAccession Number: 20142517846585 -
Record 367 of
Title:The performance of new polymer solar cells based on thiophene and thienyl-quinoxaline with the post treatments
Author(s):Gao, Bowen(1,3); Gao, Chao(2); Wu, Haimei(2); Que, Wenxiu(3); Wei, Wei(1)Source: Materials Letters Volume: 122 Issue: DOI: 10.1016/j.matlet.2014.01.140 Published: May 1, 2014Abstract:A new low band gap (optical band gap=1.62 eV) polymer (TTQ) based on thiophene and thienyl-quinoxaline by substituting phenyl in quinoxaline unit for thiophene rings was synthesized and characterized for application in polymer solar cells (PSCs). The optical band gap (Egopt) deduced from the onset (765 nm) of the polymer absorption spectrum in the films was 1.62 eV, which was less than those of the polymers TQ and FTQ and was closer to the ideal band gap of a donor for BHJ polymer solar cell applications. For the optimized polymer solar cell of TTQ:PC71BM, 1:1 w/w, in DCB solution, a PCE over 1.41% with Voc of 0.70 V, Jsc of 3.89 mA/cm2, and fill factor (FF) of 55% under AM1.5 conditions was achieved by solvent annealing in comparing with those of solvent surface treatment devices (PCE of 1.34%) and thermal annealing devices (PCE of 1.10%). ? 2014 Elsevier B.V.Accession Number: 20141017427155 -
Record 368 of
Title:Nonlinear characterization on mid-infrared fluorotellurite glass fiber
Author(s):Zhan, Huan(1,2,3); Shi, Tengfei(1,3); Zhang, Aidong(1); Zhou, Zhiguang(1); Si, Jinhai(2); Lin, Aoxiang(1)Source: Materials Letters Volume: 120 Issue: DOI: 10.1016/j.matlet.2014.01.071 Published: April 1, 2014Abstract:By physical and chemical dehydration technique to remove OH group from raw materials and via built-in casting method to make glass fiber preform, mid-infrared fluorotellurite glass fibers with low loss of 3.61 dB/m at 1550 nm were fabricated recently. With the addition of fluoride components, fluorotellurite glass fiber cane presents a 'water-free' state with a broadband transparency in the range of 0.38-4.2 μm. By the continuous-wave self-phase modulation method, the nonlinear refractive index n2 and the effective nonlinear parameter γ of the made fluorotellurite glass fiber were estimated to be 1.4×10-18 m2/W and 20.9/W/km at 1550 nm, respectively. ? 2013 Elsevier B.V. All rights reserved. ? 2014 Elsevier B.V.Accession Number: 20140717311535 -
Record 369 of
Title:A low-power magnetic-field-assisted plasma jet generated by dielectric-barrier discharge enhanced direct-current glow discharge at atmospheric pressure
Author(s):Jiang, Weiman(1); Tang, Jie(1); Wang, Yishan(1); Zhao, Wei(1); Duan, Yixiang(1,2)Source: Applied Physics Letters Volume: 104 Issue: 1 DOI: 10.1063/1.4861162 Published: January 6, 2014Abstract:A magnetic field is introduced to the dielectric-barrier discharge enhanced direct-current glow discharge for efficient plasma generation, with the discharge power of 2.7 W and total energy consumption reduced to 34 of the original. By spatially examining the emission spectra and plasma temperature, it is found that their peaks shift from edges to the center and the negative and anode glows merge into the positive column and disappear, accompanied by improvement of uniformity and chemical activity of the enlarged plasma. This lies in the enhancement of ionization in the curved and lengthened electron path and the dispersion of discharge domains. ? 2014 AIP Publishing LLC.Accession Number: 20140317213334 -
Record 370 of
Title:A simple, polymer-microfiber-assisted approach to fabricating the silica microfiber knot resonator
Author(s):Xu, Yiping(1,2); Ren, Liyong(1); Liang, Jian(1); Ma, Chengju(1,2); Wang, Yingli(1); Chen, Nana(1,2); Qu, Enshi(1)Source: Optics Communications Volume: 321 Issue: DOI: 10.1016/j.optcom.2014.01.077 Published: September 15, 2014Abstract:With the assistance of the polymer microfiber, we propose a simple approach to fabricating silica-based optical microfiber knot resonators (MKRs) in this paper. A pre-fabricated knot ring made of the polymer microfiber can be readily driven to the silica microfiber owing to the intensive van der Waals and the electrostatic forces between the polymer and the silica microfibers. The fabrication process is introduced in detail. Several kinds of MKRs are fabricated and their optical performances are demonstrated accordingly. ? 2014 Elsevier B.V.Accession Number: 20141017416437 -
Record 371 of
Title:Multiresolution imaging
Author(s):Lu, Xiaoqiang(1); Li, Xuelong(1)Source: IEEE Transactions on Cybernetics Volume: 44 Issue: 1 DOI: 10.1109/TCYB.2013.2286496 Published: January 2014Abstract:Imaging resolution has been standing as a core parameter in various applications of vision. Mostly, high resolutions are desirable or essential for many applications, e.g., in most remote sensing systems, and therefore much has been done to achieve a higher resolution of an image based on one or a series of images of relatively lower resolutions. On the other hand, lower resolutions are also preferred in some cases, e.g., for displaying images in a very small screen or interface. Accordingly, algorithms for image upsampling or downsampling have also been proposed. In the above algorithms, the downsampled or upsampled (super-resolution) versions of the original image are often taken as test images to evaluate the performance of the algorithms. However, there is one important question left unanswered: whether the downsampled or upsampled versions of the original image can represent the low-resolution or high-resolution real images from a camera? To tackle this point, the following works are carried out: 1) a multiresolution camera is designed to simultaneously capture images in three different resolutions; 2) at a given resolution (i.e., image size), the relationship between a pair of images is studied, one gained via either downsampling or super-resolution, and the other is directly captured at this given resolution by an imaging device; and 3) the performance of the algorithms of super-resolution and image downsampling is evaluated by using the given image pairs. The key reason why we can effectively tackle the aforementioned issues is that the designed multiresolution imaging camera can provide us with real images of different resolutions, which builds a solid foundation for evaluating various algorithms and analyzing the images with different resolutions, which is very important for vision. ? 2013 IEEE.Accession Number: 20140117161402 -
Record 372 of
Title:Large femtosecond third-order optical nonlinearity of Bi3.15Nd0.85Ti3O12 ferroelectric thin films
Author(s):Li, S.(1); Zhong, X.L.(1); Cheng, G.H.(2); Liu, X.(2); Wang, J.B.(1); Huang, J.(1); Song, H.J.(1); Tan, C.B.(1); Li, B.(1); Zhou, Y.C.(1)Source: Applied Physics Letters Volume: 105 Issue: 19 DOI: 10.1063/1.4900758 Published: November 10, 2014Abstract:Both the linear and nonlinear optical properties of Bi3.15Nd0.85Ti3O12 (BNT0.85) ferroelectric thin films deposited on quartz substrates were investigated. The fundamental optical constants were determined as a function of light wavelength by optical transmittance measurements. By performing single-beam Z-scan experiments with femtosecond laser pulses at a wavelength of 800nm, the two-photon absorption (TPA) coefficient β and third-order nonlinear refraction index γ were measured to be 1.15×102cm/GW and -8.15×10-3 cm2/GW, respectively. The large TPA is attributed to an indirect transition process via the intermediate energy levels and the large refractive nonlinearity is the result of the electronic polarization and ferroelectric polarization arisen from the femtosecond midinfrared radiation. The results indicate that the BNT0.85 thin film is a promising candidate for applications in nonlinear photonic devices. ? 2014 AIP Publishing LLC.Accession Number: 20150700513642